compaq presario 1993 tft display made in china

Simply Office. Simple mainstream notebooks with a 15.6 inch display and low entry prices are very popular. Plain design, glossy display and AMD hardware promise a good value for money ratio. Convincing office device or second choice?

Hewlett Packard (HP) releases a simple mainstream notebook without many frills onto the market with its Compaq Presario CQ62. The test device is equipped with a 15.6 inch display, which has a native resolution of 1366x768 pixels and a high-gloss surface. A simple, but usually sufficient, standard is also given in case and connectivity. It"s aligned for simple office work, whereby ambitions for multimedia and gaming are covered to a small extent.

We"ve taken a closer look at the HP Compaq Presario CQ62-A04sg, a low price entry model with AMD Athlon II P320 (dual core, 2.1 GHz) and ATI Radeon HD 4250. A fast 2.5 inch, 320 GB hard disk, 3 GB of DDR3 RAM, WLAN standard 802.11 b/g/n and Windows 7 Home Premium as the 64 bit version also belongs to the specs. Our test device is available for 499 euro (RRP). Are workmanship, battery life and processing performance convincing? We"ve checked the CQ62"s qualities in our detailed review.

The Compaq Presario"s case strikes with a plain design and proves to be an unobtrusive eye-catcher. The device is both suitable for the office as well as for the lecture theater in university or college. The prism texture on the display lid and inside area provides a pleasant feel. Overall, a plain design in matt black. Nevertheless, we ask ourselves why the inside display bezel have been given a high-gloss finish. It doesn"t fit into the concept and is susceptible for dust and scratches. The color options are limited and HP doesn"t offer other color alternatives.

The display hinges hold the desired position well, whereby it teeters evidently. A protective cover isn"t mandatory, even if recommendable, due to the matt and very solid exterior. The notebook weighs 2.6 kilograms with the 6 cell battery at a size of 37.4 x 24.6 x 3.2 - 3.7 centimeters (w x d x h). This weight and dimensions are acceptable for this configuration and construction size.

The given mobile technologies are quite extensive, whereas the latest standards aren"t quite met. The notebook has an RJ45 network socket and 10/100 Mbit LAN via a Realtek controller for cabled communication. The Presario bids a cutting edge Broadcom BCM 4313 controller for mobile data transfer. It supports WLAN standard 802.11 b/g/n and is thus up-to-date. Bluetooth 2.1 +EDR is also part of the alignment, however it lags a bit behind the latest Bluetooth 3.0 +HS. A model with UMTS module isn"t intended for this device category and there is no dummy slot in the case.

HP uses a 15.6 inch screen with a high-gloss surface for the display. It has a native resolution of 1366x768 pixels in a 16:9 format. Higher resolutions (interpolated) can"t be selected. A glare-type screen isn"t the best requisite for outdoor use. The display"s good rates might compensate this flaw.

The entire display surface is illuminated by small LEDs. They allegedly supply an even and bright illumination. The screen is in the wide midfield with a maximum rate of 198 cd/m2. The average of 188.2 cd/m2 is also average and higher quality devices, such as the Apple MacBook Pro (13 inch, glare-type), stand out clearly with over 270 cd/m2. Beside the reflective surface, the low brightness is another point that speaks against outdoor use.

The intense brightness decrease on the display"s left is striking. It has a difference of about 30 cd/m2 to the brighter area. Thus, the illumination sinks to only 83 cd/m2. Fortunately, this fluctuation isn"t visible during use. Another negative point of this screen is the increased black value of 1.23 cd/m2, which prevents a saturated black. It looks more like gray and lets the contrast decreases to weak 155:1. Subjectively, the reproduced colors and focus are convincing.

In order to assess the screen accurately, we checked the reproducible color spectrum with X-Rite i1Display 2 (hardware + software). HP"s Presario, colored in the comparison, can only convince to a part. This notebook isn"t suitable for professional users because the sRGB color space can"t be reproduced completely. In comparison to the Lenovo ThinkPad Edge 15, Hewlett Packard"s device is impressive though.

Outdoor use is very restricted because of the display"s glossy surface and the average up to poor assessed rates. Use in direct light incidence is hardly possible because intense reflections develop. Working in indirect light is possible with restrictions. Reflections can"t be avoided, however they can be partly intercepted by the display"s light.

The viewing angle stability is only convincing in horizontal rendering. The image remains stable in flat angles during this movement and color rendering is valid. The display hardly allows a deviation on the vertical plane. The slightest change causes the image to invert and colors falsify, respectively bleach intensely.

3 GB of DDR3 RAM from Elpida (2 GB) and Samsung (1 GB) (1066 MHz, DDR3-10600S) and a 2.5 inch hard disk with 320 GB also belong to the HP Compaq Presario CQ62-A04sg"s configuration. Replacing these components is made easy by two large maintenance covers. The RAM is limited to a maximum of 8 GB on two banks. All standard 2.5 inch drives (hard disk or solid state drive) with a construction height of 9.5 millimeters can be used for the hard disk. You can"t access the other components directly.

As expected, the installed graphics chip set in the Presario isn"t astronomically strong and places itself in the entry division. An acceptable 1435 points (3DMarks) are achieved in 3DMark06 in a resolution of 1280x1024 pixels. HP"s EliteBook 2740p with an Intel Core i5-540M and Intel GMA HD or Asus" U50VG with an older Intel Core 2 Duo T6500 and Nvidia GeForce G105M is on a similar level.

HD videos on the internet or stored locally, on the computer, are becoming more and more popular. The Presario CQ62 doesn"t have any problems rendering smoothly in 480, 720 and 1080p due to the ATI graphics unit. We looked at a current HD cinema trailer and a locally stored H.264 video in the three resolutions for a quick check.

When all system reserves are used for computing intensive applications, the battery is put under high demand. This situation can be simulated by "Classic Test" in the BatteryEater tool. An OpenGL calculation with maximum display brightness is executed for this. The mobile technologies and Windows 7"s high performance profile are selected as additional consumers. The battery is drained after poor 84 minutes (1 hour and 24 minutes) and an electrical outlet has to be targeted. You have an acceptable 3 hours and 24 minutes for checking your emails and surfing on the internet.

CQ62"s charged battery is sufficient for two movies without extra length. In opposition to the "Classic Test", the Reader"s Test determines the maximum possible battery life. For this, all mobile technologies are disabled, Windows 7"s energy savings options are enabled and the display"s minimum brightness is selected. The battery is also drained fairly fast with 4 hours and 5 minutes in this situation. Unfortunately, it"s not possible to use a battery with 8 or 9 cells because they aren"t available. They wouldn"t fit in the intended compartment on the bottom either.

HP"s Compaq Presario CQ62-A04sg is a simple office notebook without reserves for complex applications. The AMD Athlon II P320 (2x1.10 GHz) and the ATI Radeon HD 4250 do a good job for the entry level, whereby current 3D games can only be presented smoothly in minimum settings. The ATI Mobility Radeon HD 5650 or the Nvidia GeForce GT 330M is recommendable for higher demands.

The 15.6 inch display is a big disadvantage of this device. The glossy surface and average to poor display rates aren"t convincing and outdoor use is hardly possible. A good and especially matt display would definitely have been a better solution. The "little" 6 cell battery seems to beoverburdened by the installed components" requirements and the battery life is restricted. The Compaq Presario from Hewlett Packard hasn"t earned any kudos with 2 hours and 30 minutes in realistic use.

You"ll get a simple office notebook with a 15.6 inch screen for 499 euro including value added tax (RRP). However, you have to compromise on gaming performance and a superior mobility. Due to this requisite, the HP Compaq Presario CQ62-A04sg is rewarded with a round 80 percent in the overall rating.

A liquid-crystal display (LCD) is a flat-panel display or other electronically modulated optical device that uses the light-modulating properties of liquid crystals combined with polarizers. Liquid crystals do not emit light directlybacklight or reflector to produce images in color or monochrome.seven-segment displays, as in a digital clock, are all good examples of devices with these displays. They use the same basic technology, except that arbitrary images are made from a matrix of small pixels, while other displays have larger elements. LCDs can either be normally on (positive) or off (negative), depending on the polarizer arrangement. For example, a character positive LCD with a backlight will have black lettering on a background that is the color of the backlight, and a character negative LCD will have a black background with the letters being of the same color as the backlight. Optical filters are added to white on blue LCDs to give them their characteristic appearance.

LCDs are used in a wide range of applications, including LCD televisions, computer monitors, instrument panels, aircraft cockpit displays, and indoor and outdoor signage. Small LCD screens are common in LCD projectors and portable consumer devices such as digital cameras, watches, digital clocks, calculators, and mobile telephones, including smartphones. LCD screens are also used on consumer electronics products such as DVD players, video game devices and clocks. LCD screens have replaced heavy, bulky cathode-ray tube (CRT) displays in nearly all applications. LCD screens are available in a wider range of screen sizes than CRT and plasma displays, with LCD screens available in sizes ranging from tiny digital watches to very large television receivers. LCDs are slowly being replaced by OLEDs, which can be easily made into different shapes, and have a lower response time, wider color gamut, virtually infinite color contrast and viewing angles, lower weight for a given display size and a slimmer profile (because OLEDs use a single glass or plastic panel whereas LCDs use two glass panels; the thickness of the panels increases with size but the increase is more noticeable on LCDs) and potentially lower power consumption (as the display is only "on" where needed and there is no backlight). OLEDs, however, are more expensive for a given display size due to the very expensive electroluminescent materials or phosphors that they use. Also due to the use of phosphors, OLEDs suffer from screen burn-in and there is currently no way to recycle OLED displays, whereas LCD panels can be recycled, although the technology required to recycle LCDs is not yet widespread. Attempts to maintain the competitiveness of LCDs are quantum dot displays, marketed as SUHD, QLED or Triluminos, which are displays with blue LED backlighting and a Quantum-dot enhancement film (QDEF) that converts part of the blue light into red and green, offering similar performance to an OLED display at a lower price, but the quantum dot layer that gives these displays their characteristics can not yet be recycled.

Since LCD screens do not use phosphors, they rarely suffer image burn-in when a static image is displayed on a screen for a long time, e.g., the table frame for an airline flight schedule on an indoor sign. LCDs are, however, susceptible to image persistence.battery-powered electronic equipment more efficiently than a CRT can be. By 2008, annual sales of televisions with LCD screens exceeded sales of CRT units worldwide, and the CRT became obsolete for most purposes.

Most color LCD systems use the same technique, with color filters used to generate red, green, and blue subpixels. The LCD color filters are made with a photolithography process on large glass sheets that are later glued with other glass sheets containing a TFT array, spacers and liquid crystal, creating several color LCDs that are then cut from one another and laminated with polarizer sheets. Red, green, blue and black photoresists (resists) are used. All resists contain a finely ground powdered pigment, with particles being just 40 nanometers across. The black resist is the first to be applied; this will create a black grid (known in the industry as a black matrix) that will separate red, green and blue subpixels from one another, increasing contrast ratios and preventing light from leaking from one subpixel onto other surrounding subpixels.Super-twisted nematic LCD, where the variable twist between tighter-spaced plates causes a varying double refraction birefringence, thus changing the hue.

The optical effect of a TN device in the voltage-on state is far less dependent on variations in the device thickness than that in the voltage-off state. Because of this, TN displays with low information content and no backlighting are usually operated between crossed polarizers such that they appear bright with no voltage (the eye is much more sensitive to variations in the dark state than the bright state). As most of 2010-era LCDs are used in television sets, monitors and smartphones, they have high-resolution matrix arrays of pixels to display arbitrary images using backlighting with a dark background. When no image is displayed, different arrangements are used. For this purpose, TN LCDs are operated between parallel polarizers, whereas IPS LCDs feature crossed polarizers. In many applications IPS LCDs have replaced TN LCDs, particularly in smartphones. Both the liquid crystal material and the alignment layer material contain ionic compounds. If an electric field of one particular polarity is applied for a long period of time, this ionic material is attracted to the surfaces and degrades the device performance. This is avoided either by applying an alternating current or by reversing the polarity of the electric field as the device is addressed (the response of the liquid crystal layer is identical, regardless of the polarity of the applied field).

Displays for a small number of individual digits or fixed symbols (as in digital watches and pocket calculators) can be implemented with independent electrodes for each segment.alphanumeric or variable graphics displays are usually implemented with pixels arranged as a matrix consisting of electrically connected rows on one side of the LC layer and columns on the other side, which makes it possible to address each pixel at the intersections. The general method of matrix addressing consists of sequentially addressing one side of the matrix, for example by selecting the rows one-by-one and applying the picture information on the other side at the columns row-by-row. For details on the various matrix addressing schemes see passive-matrix and active-matrix addressed LCDs.

LCDs, along with OLED displays, are manufactured in cleanrooms borrowing techniques from semiconductor manufacturing and using large sheets of glass whose size has increased over time. Several displays are manufactured at the same time, and then cut from the sheet of glass, also known as the mother glass or LCD glass substrate. The increase in size allows more displays or larger displays to be made, just like with increasing wafer sizes in semiconductor manufacturing. The glass sizes are as follows:

The origins and the complex history of liquid-crystal displays from the perspective of an insider during the early days were described by Joseph A. Castellano in Liquid Gold: The Story of Liquid Crystal Displays and the Creation of an Industry.IEEE History Center.Peter J. Wild, can be found at the Engineering and Technology History Wiki.

The MOSFET (metal-oxide-semiconductor field-effect transistor) was invented by Mohamed M. Atalla and Dawon Kahng at Bell Labs in 1959, and presented in 1960.Paul K. Weimer at RCA developed the thin-film transistor (TFT) in 1962.

In 1964, George H. Heilmeier, then working at the RCA laboratories on the effect discovered by Williams achieved the switching of colors by field-induced realignment of dichroic dyes in a homeotropically oriented liquid crystal. Practical problems with this new electro-optical effect made Heilmeier continue to work on scattering effects in liquid crystals and finally the achievement of the first operational liquid-crystal display based on what he called the George H. Heilmeier was inducted in the National Inventors Hall of FameIEEE Milestone.

The idea of a TFT-based liquid-crystal display (LCD) was conceived by Bernard Lechner of RCA Laboratories in 1968.dynamic scattering mode (DSM) LCD that used standard discrete MOSFETs.

On December 4, 1970, the twisted nematic field effect (TN) in liquid crystals was filed for patent by Hoffmann-LaRoche in Switzerland, (Swiss patent No. 532 261) with Wolfgang Helfrich and Martin Schadt (then working for the Central Research Laboratories) listed as inventors.Brown, Boveri & Cie, its joint venture partner at that time, which produced TN displays for wristwatches and other applications during the 1970s for the international markets including the Japanese electronics industry, which soon produced the first digital quartz wristwatches with TN-LCDs and numerous other products. James Fergason, while working with Sardari Arora and Alfred Saupe at Kent State University Liquid Crystal Institute, filed an identical patent in the United States on April 22, 1971.ILIXCO (now LXD Incorporated), produced LCDs based on the TN-effect, which soon superseded the poor-quality DSM types due to improvements of lower operating voltages and lower power consumption. Tetsuro Hama and Izuhiko Nishimura of Seiko received a US patent dated February 1971, for an electronic wristwatch incorporating a TN-LCD.

In 1972, the concept of the active-matrix thin-film transistor (TFT) liquid-crystal display panel was prototyped in the United States by T. Peter Brody"s team at Westinghouse, in Pittsburgh, Pennsylvania.Westinghouse Research Laboratories demonstrated the first thin-film-transistor liquid-crystal display (TFT LCD).high-resolution and high-quality electronic visual display devices use TFT-based active matrix displays.active-matrix liquid-crystal display (AM LCD) in 1974, and then Brody coined the term "active matrix" in 1975.

In 1972 North American Rockwell Microelectronics Corp introduced the use of DSM LCDs for calculators for marketing by Lloyds Electronics Inc, though these required an internal light source for illumination.Sharp Corporation followed with DSM LCDs for pocket-sized calculators in 1973Seiko and its first 6-digit TN-LCD quartz wristwatch, and Casio"s "Casiotron". Color LCDs based on Guest-Host interaction were invented by a team at RCA in 1968.TFT LCDs similar to the prototypes developed by a Westinghouse team in 1972 were patented in 1976 by a team at Sharp consisting of Fumiaki Funada, Masataka Matsuura, and Tomio Wada,

The first color LCD televisions were developed as handheld televisions in Japan. In 1980, Hattori Seiko"s R&D group began development on color LCD pocket televisions.Seiko Epson released the first LCD television, the Epson TV Watch, a wristwatch equipped with a small active-matrix LCD television.dot matrix TN-LCD in 1983.Citizen Watch,TFT LCD.computer monitors and LCD televisions.3LCD projection technology in the 1980s, and licensed it for use in projectors in 1988.compact, full-color LCD projector.

In 2007 the image quality of LCD televisions surpassed the image quality of cathode-ray-tube-based (CRT) TVs.LCD TVs were projected to account 50% of the 200 million TVs to be shipped globally in 2006, according to Displaybank.Toshiba announced 2560 × 1600 pixels on a 6.1-inch (155 mm) LCD panel, suitable for use in a tablet computer,transparent and flexible, but they cannot emit light without a backlight like OLED and microLED, which are other technologies that can also be made flexible and transparent.

Since LCDs produce no light of their own, they require external light to produce a visible image.backlight. Active-matrix LCDs are almost always backlit.Transflective LCDs combine the features of a backlit transmissive display and a reflective display.

CCFL: The LCD panel is lit either by two cold cathode fluorescent lamps placed at opposite edges of the display or an array of parallel CCFLs behind larger displays. A diffuser (made of PMMA acrylic plastic, also known as a wave or light guide/guiding plateinverter to convert whatever DC voltage the device uses (usually 5 or 12 V) to ≈1000 V needed to light a CCFL.

EL-WLED: The LCD panel is lit by a row of white LEDs placed at one or more edges of the screen. A light diffuser (light guide plate, LGP) is then used to spread the light evenly across the whole display, similarly to edge-lit CCFL LCD backlights. The diffuser is made out of either PMMA plastic or special glass, PMMA is used in most cases because it is rugged, while special glass is used when the thickness of the LCD is of primary concern, because it doesn"t expand as much when heated or exposed to moisture, which allows LCDs to be just 5mm thick. Quantum dots may be placed on top of the diffuser as a quantum dot enhancement film (QDEF, in which case they need a layer to be protected from heat and humidity) or on the color filter of the LCD, replacing the resists that are normally used.

WLED array: The LCD panel is lit by a full array of white LEDs placed behind a diffuser behind the panel. LCDs that use this implementation will usually have the ability to dim or completely turn off the LEDs in the dark areas of the image being displayed, effectively increasing the contrast ratio of the display. The precision with which this can be done will depend on the number of dimming zones of the display. The more dimming zones, the more precise the dimming, with less obvious blooming artifacts which are visible as dark grey patches surrounded by the unlit areas of the LCD. As of 2012, this design gets most of its use from upscale, larger-screen LCD televisions.

RGB-LED array: Similar to the WLED array, except the panel is lit by a full array of RGB LEDs. While displays lit with white LEDs usually have a poorer color gamut than CCFL lit displays, panels lit with RGB LEDs have very wide color gamuts. This implementation is most popular on professional graphics editing LCDs. As of 2012, LCDs in this category usually cost more than $1000. As of 2016 the cost of this category has drastically reduced and such LCD televisions obtained same price levels as the former 28" (71 cm) CRT based categories.

Today, most LCD screens are being designed with an LED backlight instead of the traditional CCFL backlight, while that backlight is dynamically controlled with the video information (dynamic backlight control). The combination with the dynamic backlight control, invented by Philips researchers Douglas Stanton, Martinus Stroomer and Adrianus de Vaan, simultaneously increases the dynamic range of the display system (also marketed as HDR, high dynamic range television or FLAD, full-area local area dimming).

Due to the LCD layer that generates the desired high resolution images at flashing video speeds using very low power electronics in combination with LED based backlight technologies, LCD technology has become the dominant display technology for products such as televisions, desktop monitors, notebooks, tablets, smartphones and mobile phones. Although competing OLED technology is pushed to the market, such OLED displays do not feature the HDR capabilities like LCDs in combination with 2D LED backlight technologies have, reason why the annual market of such LCD-based products is still growing faster (in volume) than OLED-based products while the efficiency of LCDs (and products like portable computers, mobile phones and televisions) may even be further improved by preventing the light to be absorbed in the colour filters of the LCD.

A standard television receiver screen, a modern LCD panel, has over six million pixels, and they are all individually powered by a wire network embedded in the screen. The fine wires, or pathways, form a grid with vertical wires across the whole screen on one side of the screen and horizontal wires across the whole screen on the other side of the screen. To this grid each pixel has a positive connection on one side and a negative connection on the other side. So the total amount of wires needed for a 1080p display is 3 x 1920 going vertically and 1080 going horizontally for a total of 6840 wires horizontally and vertically. That"s three for red, green and blue and 1920 columns of pixels for each color for a total of 5760 wires going vertically and 1080 rows of wires going horizontally. For a panel that is 28.8 inches (73 centimeters) wide, that means a wire density of 200 wires per inch along the horizontal edge.

Monochrome and later color passive-matrix LCDs were standard in most early laptops (although a few used plasma displaysGame Boyactive-matrix became standard on all laptops. The commercially unsuccessful Macintosh Portable (released in 1989) was one of the first to use an active-matrix display (though still monochrome). Passive-matrix LCDs are still used in the 2010s for applications less demanding than laptop computers and TVs, such as inexpensive calculators. In particular, these are used on portable devices where less information content needs to be displayed, lowest power consumption (no backlight) and low cost are desired or readability in direct sunlight is needed.

A comparison between a blank passive-matrix display (top) and a blank active-matrix display (bottom). A passive-matrix display can be identified when the blank background is more grey in appearance than the crisper active-matrix display, fog appears on all edges of the screen, and while pictures appear to be fading on the screen.

Displays having a passive-matrix structure are employing Crosstalk between activated and non-activated pixels has to be handled properly by keeping the RMS voltage of non-activated pixels below the threshold voltage as discovered by Peter J. Wild in 1972,

STN LCDs have to be continuously refreshed by alternating pulsed voltages of one polarity during one frame and pulses of opposite polarity during the next frame. Individual pixels are addressed by the corresponding row and column circuits. This type of display is called response times and poor contrast are typical of passive-matrix addressed LCDs with too many pixels and driven according to the "Alt & Pleshko" drive scheme. Welzen and de Vaan also invented a non RMS drive scheme enabling to drive STN displays with video rates and enabling to show smooth moving video images on an STN display.

Bistable LCDs do not require continuous refreshing. Rewriting is only required for picture information changes. In 1984 HA van Sprang and AJSM de Vaan invented an STN type display that could be operated in a bistable mode, enabling extremely high resolution images up to 4000 lines or more using only low voltages.

High-resolution color displays, such as modern LCD computer monitors and televisions, use an active-matrix structure. A matrix of thin-film transistors (TFTs) is added to the electrodes in contact with the LC layer. Each pixel has its own dedicated transistor, allowing each column line to access one pixel. When a row line is selected, all of the column lines are connected to a row of pixels and voltages corresponding to the picture information are driven onto all of the column lines. The row line is then deactivated and the next row line is selected. All of the row lines are selected in sequence during a refresh operation. Active-matrix addressed displays look brighter and sharper than passive-matrix addressed displays of the same size, and generally have quicker response times, producing much better images. Sharp produces bistable reflective LCDs with a 1-bit SRAM cell per pixel that only requires small amounts of power to maintain an image.

Segment LCDs can also have color by using Field Sequential Color (FSC LCD). This kind of displays have a high speed passive segment LCD panel with an RGB backlight. The backlight quickly changes color, making it appear white to the naked eye. The LCD panel is synchronized with the backlight. For example, to make a segment appear red, the segment is only turned ON when the backlight is red, and to make a segment appear magenta, the segment is turned ON when the backlight is blue, and it continues to be ON while the backlight becomes red, and it turns OFF when the backlight becomes green. To make a segment appear black, the segment is always turned ON. An FSC LCD divides a color image into 3 images (one Red, one Green and one Blue) and it displays them in order. Due to persistence of vision, the 3 monochromatic images appear as one color image. An FSC LCD needs an LCD panel with a refresh rate of 180 Hz, and the response time is reduced to just 5 milliseconds when compared with normal STN LCD panels which have a response time of 16 milliseconds.

Samsung introduced UFB (Ultra Fine & Bright) displays back in 2002, utilized the super-birefringent effect. It has the luminance, color gamut, and most of the contrast of a TFT-LCD, but only consumes as much power as an STN display, according to Samsung. It was being used in a variety of Samsung cellular-telephone models produced until late 2006, when Samsung stopped producing UFB displays. UFB displays were also used in certain models of LG mobile phones.

Twisted nematic displays contain liquid crystals that twist and untwist at varying degrees to allow light to pass through. When no voltage is applied to a TN liquid crystal cell, polarized light passes through the 90-degrees twisted LC layer. In proportion to the voltage applied, the liquid crystals untwist changing the polarization and blocking the light"s path. By properly adjusting the level of the voltage almost any gray level or transmission can be achieved.

In-plane switching is an LCD technology that aligns the liquid crystals in a plane parallel to the glass substrates. In this method, the electrical field is applied through opposite electrodes on the same glass substrate, so that the liquid crystals can be reoriented (switched) essentially in the same plane, although fringe fields inhibit a homogeneous reorientation. This requires two transistors for each pixel instead of the single transistor needed for a standard thin-film transistor (TFT) display. The IPS technology is used in everything from televisions, computer monitors, and even wearable devices, especially almost all LCD smartphone panels are IPS/FFS mode. IPS displays belong to the LCD panel family screen types. The other two types are VA and TN. Before LG Enhanced IPS was introduced in 2001 by Hitachi as 17" monitor in Market, the additional transistors resulted in blocking more transmission area, thus requiring a brighter backlight and consuming more power, making this type of display less desirable for notebook computers. Panasonic Himeji G8.5 was using an enhanced version of IPS, also LGD in Korea, then currently the world biggest LCD panel manufacture BOE in China is also IPS/FFS mode TV panel.

In 2015 LG Display announced the implementation of a new technology called M+ which is the addition of white subpixel along with the regular RGB dots in their IPS panel technology.

Most of the new M+ technology was employed on 4K TV sets which led to a controversy after tests showed that the addition of a white sub pixel replacing the traditional RGB structure would reduce the resolution by around 25%. This means that a 4K TV cannot display the full UHD TV standard. The media and internet users later called this "RGBW" TVs because of the white sub pixel. Although LG Display has developed this technology for use in notebook display, outdoor and smartphones, it became more popular in the TV market because the announced 4K UHD resolution but still being incapable of achieving true UHD resolution defined by the CTA as 3840x2160 active pixels with 8-bit color. This negatively impacts the rendering of text, making it a bit fuzzier, which is especially noticeable when a TV is used as a PC monitor.

In 2011, LG claimed the smartphone LG Optimus Black (IPS LCD (LCD NOVA)) has the brightness up to 700 nits, while the competitor has only IPS LCD with 518 nits and double an active-matrix OLED (AMOLED) display with 305 nits. LG also claimed the NOVA display to be 50 percent more efficient than regular LCDs and to consume only 50 percent of the power of AMOLED displays when producing white on screen.

Vertical-alignment displays are a form of LCDs in which the liquid crystals naturally align vertically to the glass substrates. When no voltage is applied, the liquid crystals remain perpendicular to the substrate, creating a black display between crossed polarizers. When voltage is applied, the liquid crystals shift to a tilted position, allowing light to pass through and create a gray-scale display depending on the amount of tilt generated by the electric field. It has a deeper-black background, a higher contrast ratio, a wider viewing angle, and better image quality at extreme temperatures than traditional twisted-nematic displays.

Some manufacturers, notably in South Korea where some of the largest LCD panel manufacturers, such as LG, are located, now have a zero-defective-pixel guarantee, which is an extra screening process which can then determine "A"- and "B"-grade panels.clouding (or less commonly mura), which describes the uneven patches of changes in luminance. It is most visible in dark or black areas of displayed scenes.

The zenithal bistable device (ZBD), developed by Qinetiq (formerly DERA), can retain an image without power. The crystals may exist in one of two stable orientations ("black" and "white") and power is only required to change the image. ZBD Displays is a spin-off company from QinetiQ who manufactured both grayscale and color ZBD devices. Kent Displays has also developed a "no-power" display that uses polymer stabilized cholesteric liquid crystal (ChLCD). In 2009 Kent demonstrated the use of a ChLCD to cover the entire surface of a mobile phone, allowing it to change colors, and keep that color even when power is removed.

Resolution The resolution of an LCD is expressed by the number of columns and rows of pixels (e.g., 1024×768). Each pixel is usually composed 3 sub-pixels, a red, a green, and a blue one. This had been one of the few features of LCD performance that remained uniform among different designs. However, there are newer designs that share sub-pixels among pixels and add Quattron which attempt to efficiently increase the perceived resolution of a display without increasing the actual resolution, to mixed results.

Spatial performance: For a computer monitor or some other display that is being viewed from a very close distance, resolution is often expressed in terms of dot pitch or pixels per inch, which is consistent with the printing industry. Display density varies per application, with televisions generally having a low density for long-distance viewing and portable devices having a high density for close-range detail. The Viewing Angle of an LCD may be important depending on the display and its usage, the limitations of certain display technologies mean the display only displays accurately at certain angles.

Temporal performance: the temporal resolution of an LCD is how well it can display changing images, or the accuracy and the number of times per second the display draws the data it is being given. LCD pixels do not flash on/off between frames, so LCD monitors exhibit no refresh-induced flicker no matter how low the refresh rate.

Color performance: There are multiple terms to describe different aspects of color performance of a display. Color gamut is the range of colors that can be displayed, and color depth, which is the fineness with which the color range is divided. Color gamut is a relatively straight forward feature, but it is rarely discussed in marketing materials except at the professional level. Having a color range that exceeds the content being shown on the screen has no benefits, so displays are only made to perform within or below the range of a certain specification.white point and gamma correction, which describe what color white is and how the other colors are displayed relative to white.

Brightness and contrast ratio: Contrast ratio is the ratio of the brightness of a full-on pixel to a full-off pixel. The LCD itself is only a light valve and does not generate light; the light comes from a backlight that is either fluorescent or a set of LEDs. Brightness is usually stated as the maximum light output of the LCD, which can vary greatly based on the transparency of the LCD and the brightness of the backlight. Brighter backlight allows stronger contrast and higher dynamic range (HDR displays are graded in peak luminance), but there is always a trade-off between brightness and power consumption.

Low power consumption. Depending on the set display brightness and content being displayed, the older CCFT backlit models typically use less than half of the power a CRT monitor of the same size viewing area would use, and the modern LED backlit models typically use 10–25% of the power a CRT monitor would use.

No theoretical resolution limit. When multiple LCD panels are used together to create a single canvas, each additional panel increases the total resolution of the display, which is commonly called stacked resolution.

As an inherently digital device, the LCD can natively display digital data from a DVI or HDMI connection without requiring conversion to analog. Some LCD panels have native fiber optic inputs in addition to DVI and HDMI.

Display motion blur on moving objects caused by slow response times (>8 ms) and eye-tracking on a sample-and-hold display, unless a strobing backlight is used. However, this strobing can cause eye strain, as is noted next:

As of 2012, most implementations of LCD backlighting use pulse-width modulation (PWM) to dim the display,CRT monitor at 85 Hz refresh rate would (this is because the entire screen is strobing on and off rather than a CRT"s phosphor sustained dot which continually scans across the display, leaving some part of the display always lit), causing severe eye-strain for some people.LED-backlit monitors, because the LEDs switch on and off faster than a CCFL lamp.

Only one native resolution. Displaying any other resolution either requires a video scaler, causing blurriness and jagged edges, or running the display at native resolution using 1:1 pixel mapping, causing the image either not to fill the screen (letterboxed display), or to run off the lower or right edges of the screen.

Fixed bit depth (also called color depth). Many cheaper LCDs are only able to display 262144 (218) colors. 8-bit S-IPS panels can display 16 million (224) colors and have significantly better black level, but are expensive and have slower response time.

Input lag, because the LCD"s A/D converter waits for each frame to be completely been output before drawing it to the LCD panel. Many LCD monitors do post-processing before displaying the image in an attempt to compensate for poor color fidelity, which adds an additional lag. Further, a video scaler must be used when displaying non-native resolutions, which adds yet more time lag. Scaling and post processing are usually done in a single chip on modern monitors, but each function that chip performs adds some delay. Some displays have a video gaming mode which disables all or most processing to reduce perceivable input lag.

Subject to burn-in effect, although the cause differs from CRT and the effect may not be permanent, a static image can cause burn-in in a matter of hours in badly designed displays.

Several different families of liquid crystals are used in liquid crystal displays. The molecules used have to be anisotropic, and to exhibit mutual attraction. Polarizable rod-shaped molecules (biphenyls, terphenyls, etc.) are common. A common form is a pair of aromatic benzene rings, with a nonpolar moiety (pentyl, heptyl, octyl, or alkyl oxy group) on one end and polar (nitrile, halogen) on the other. Sometimes the benzene rings are separated with an acetylene group, ethylene, CH=N, CH=NO, N=N, N=NO, or ester group. In practice, eutectic mixtures of several chemicals are used, to achieve wider temperature operating range (−10..+60 °C for low-end and −20..+100 °C for high-performance displays). For example, the E7 mixture is composed of three biphenyls and one terphenyl: 39 wt.% of 4"-pentyl[1,1"-biphenyl]-4-carbonitrile (nematic range 24..35 °C), 36 wt.% of 4"-heptyl[1,1"-biphenyl]-4-carbonitrile (nematic range 30..43 °C), 16 wt.% of 4"-octoxy[1,1"-biphenyl]-4-carbonitrile (nematic range 54..80 °C), and 9 wt.% of 4-pentyl[1,1":4",1-terphenyl]-4-carbonitrile (nematic range 131..240 °C).

Castellano, Joseph A (2005). Liquid Gold: The Story of Liquid Crystal Displays and the Creation of an Industry. World Scientific Publishing. ISBN 978-981-238-956-5.

Rong-Jer Lee; Jr-Cheng Fan; Tzong-Shing Cheng; Jung-Lung Wu (March 10, 1999). "Pigment-dispersed color resist with high resolution for advanced color filter application". Proceedings of 5th Asian Symposium on Information Display. ASID "99 (IEEE Cat. No.99EX291). pp. 359–363. doi:10.1109/ASID.1999.762781. ISBN 957-97347-9-8. S2CID 137460486 – via IEEE Xplore.

Liquid Gold: The Story of Liquid Crystal Displays and the Creation of an Industry, Joseph A. Castellano, 2005 World Scientific Publishing Co. Pte. Ltd., ISBN 981-238-956-3.

Gray, George W.; Kelly, Stephen M. (1999). "Liquid crystals for twisted nematic display devices". Journal of Materials Chemistry. 9 (9): 2037–2050. doi:10.1039/a902682g.

Kawamoto, H. (2012). "The Inventors of TFT Active-Matrix LCD Receive the 2011 IEEE Nishizawa Medal". Journal of Display Technology. 8 (1): 3–4. Bibcode:2012JDisT...8....3K. doi:10.1109/JDT.2011.2177740. ISSN 1551-319X.

Brody, T. Peter; Asars, J. A.; Dixon, G. D. (November 1973). "A 6 × 6 inch 20 lines-per-inch liquid-crystal display panel". 20 (11): 995–1001. Bibcode:1973ITED...20..995B. doi:10.1109/T-ED.1973.17780. ISSN 0018-9383.

Hirohisa Kawamoto (2013), The history of liquid-crystal display and its industry, HISTory of ELectro-technology CONference (HISTELCON), 2012 Third IEEE, Institute of Electrical and Electronics Engineers, DOI 10.1109/HISTELCON.2012.6487587

Competing display technologies for the best image performance; A.J.S.M. de Vaan; Journal of the society of information displays, Volume 15, Issue 9 September 2007 Pages 657–666; http://onlinelibrary.wiley.com/doi/10.1889/1.2785199/abstract?

Pixel-by-pixel local dimming for high dynamic range liquid crystal displays; H. Chen; R. Zhu; M.C. Li; S.L. Lee and S.T. Wu; Vol. 25, No. 3; 6 Feb 2017; Optics Express 1973; https://www.osapublishing.org/oe/viewmedia.cfm?uri=oe-25-3-1973&seq=0

Broadband reflective polarizers based on form birefringence for ultra-thin liquid crystal displays; S.U. Pan; L. Tan and H.S. Kwok; Vol. 25, No. 15; 24 Jul 2017; Optics Express 17499; https://www.osapublishing.org/oe/viewmedia.cfm?uri=oe-25-15-17499&seq=0

Printable Reflective Color Filter Arrays from Cholesteric Reactive Mesogen Nanoposts; M.E. Sousa and G.P. Crawford; Society of Information Displays; SID digest, Volume 36, Issue 1; May 2005; Pages 706–709; http://onlinelibrary.wiley.com/doi/10.1889/1.2036540/full#references

P. J. Wild, Matrix-addressed liquid crystal projection display, Digest of Technical Papers, International Symposium, Society for Information Display, June 1972, pp. 62–63.

K. H. Lee; H. Y. Kim; K. H. Park; S. J. Jang; I. C. Park & J. Y. Lee (June 2006). "A Novel Outdoor Readability of Portable TFT-LCD with AFFS Technology". SID Symposium Digest of Technical Papers. 37 (1): 1079–1082. doi:10.1889/1.2433159. S2CID 129569963.

NXP Semiconductors (October 21, 2011). "UM10764 Vertical Alignment (VA) displays and NXP LCD drivers" (PDF). Archived from the original (PDF) on March 14, 2014. Retrieved September 4, 2014.

"Display (LCD) replacement for defective pixels – ThinkPad". Lenovo. June 25, 2007. Archived from the original on December 31, 2006. Retrieved July 13, 2007.

Explanation of why pulse width modulated backlighting is used, and its side-effects, "Pulse Width Modulation on LCD monitors", TFT Central. Retrieved June 2012.

Maintenance and Service Guide HP Pavilion dv4000 Notebook PC Compaq Presario V4000 Notebook PC Document Part Number: 377367-003 October 2005 This guide is a troubleshooting reference used for maintaining and servicing the computer. It provides comprehensive information on identifying computer features, components, and spare parts;...

Product Description The external components on the right side of the Compaq Presario V4000 are shown below and described in Table 1-3. Depending on your computer model, component locations may vary. Right-Side Components, Compaq Presario V4000 1–10 Maintenance and Service Guide...

Right-Side Components, Compaq Presario V4000 Item Component Optical drive Audio-out (headphone) jack (full-featured models only) Audio-in (microphone) jack (full-featured models only) USB ports (full-featured models only) ✎ Number of USB ports vary by model. Monitor port (full-featured models only) S-Video-out jack (full-featured models only) Security cable slot...

Product Description The external components on the left side of the Compaq Presario V4000 are shown below and described in Table 1-5. Depending on your computer model, component locations may vary. Left-Side Components, Compaq Presario V4000 Left-Side Components, Compaq Presario V4000 Item Component Power connector...

Left-Side Components, Compaq Presario V4000 (Continued) Item Component 1394 port (4-pin; full-featured models only) Memory Reader (full-featured models only) Memory Reader light (full-featured models only) ExpressCard slot (full-featured models only) PC Card slot PC Card eject button Monitor port (full-featured models only) S-Video-out jack (defeatured...

Product Description The top components on Compaq Presario V4000 models are shown below and described in Table 1-8. Top Components, Compaq Presario V4000 Models 1–20 Maintenance and Service Guide...

Top Components, Compaq Presario V4000 Models Item Component Wireless button (select models only) ✎ To establish a wireless connection, a wireless network must already be set up. Power button ✎ If the system has stopped responding and Windows shutdown procedures cannot be used, press and hold for at least 4 seconds to turn off the computer.

Product Description The HP Pavilion dv4000 computer TouchPad components are shown below and described in Table 1-9. TouchPad Components, HP Pavilion dv4000 TouchPad Components, HP Pavilion dv4000 Item Component TouchPad Left and right TouchPad buttons Display release button TouchPad vertical scroll zone 1–22...

The Compaq Presario V4000 computer TouchPad components are shown below and described in Table 1-10. TouchPad Components, Compaq Presario V4000 TouchPad Components, Compaq Presario V4000 Item Component TouchPad TouchPad horizontal scroll zone Left and right TouchPad buttons TouchPad vertical scroll zone Maintenance and Service Guide Table 1-10 Function...

Bottom Components (Continued) Item Component Optical drive Labels area Battery pack release latch Memory module cover Mini PCI compartment cover Ä To prevent an unresponsive system and the display of a warning message, install only a Mini PCI device authorized for use in your computer by the governmental agency that regulates wireless devices in your country.

Refer to display assembly internal component spare part number information. Switch cover (includes LED board and LED board cable) For use with HP Pavilion dv4000 models with wireless capability For use with HP Pavilion dv4000 models without wireless capability For use with Compaq Presario V4000 models with...

Spare Parts: Computer Major Components (Continued) Item Description Keyboards For use with HP Pavilion dv4000 models: Belgium Denmark Europe France French Canada Germany Greece Israel Italy Korea Norway For use with Compaq Presario V4000 models: Denmark France French Canada Italy...

Spare Parts: Computer Major Components (Continued) Item Description Top covers For use with full-featured HP Pavilion dv4000 models (includes TouchPad) For use with defeatured HP Pavilion dv4000 models (includes TouchPad) For use with full-featured Compaq Presario V4000 models (does not include TouchPad)

Spare Parts: Computer Major Components (Continued) Item Description Optical drives For use with HP Pavilion dv4000 models DVD±RW and CD-RW Double Layer Combo Drive with LightScribe DVD±RW and CD-RW Double Layer Combo Drive DVD/CD-RW Combo Drive DVD-ROM drive For use with Compaq Presario V4000 models DVD±RW and CD-RW Double Layer Combo Drive...

Wireless antenna (includes cable and board) Display Label Kit (not illustrated) Display Screw Kit (not illustrated, includes Phillips PM2.5×7.0 screws, Phillips PM2.5×5.0 screws, and rubber screw covers) Maintenance and Service Guide Table 3-2 HP Pavilion dv4000 Illustrated Parts Catalog 403919-001 403918-001 403921-001 397924-001 403925-001 403923-001 3–15...

Compaq Presario V4000 Models Display Assembly Subcomponent Spare Part Number Information Item Description Display Plastics Kit, includes: ■ Display bezel ■ Display enclosure ■ Display hinge covers Display Panel Kit (includes the display panel, display inverter, and display cable) Display Hinge Kit, includes: ■...

Miscellaneous Doors/Covers Kit Item Description Miscellaneous Doors/Covers Kit For use with HP Pavilion dv4000 models For use with Compaq Presario V4000 models Includes: PC Card slot space saver ExpressCard slot space saver Thermal cover (includes one captive screw, secured by C-clip)

Hard drives (include frame and connector) 5400 rpm 80-GB 60-GB Optical drives For use with HP Pavilion dv4000 models DVD±RW and CD-RW Double Layer Combo Drive with LightScribe DVD±RW and CD-RW Double Layer Combo Drive DVD/CD-RW Combo Drive DVD-ROM drive For use with Compaq Presario V4000 models DVD±RW and CD-RW Double Layer Combo Drive...

■ Phillips PM2.5×4.0 screw ■ Phillips PM2.0×16.0 screw ■ Phillips PM2.0×5.0 screw For use with full-featured HP Pavilion dv4000 models For use with defeatured HP Pavilion dv4000 models For use with full-featured Compaq Presario V4000 models For use with defeatured Compaq Presario V4000 models...

HP Pavilion dv4000 models (includes display cable, wireless antenna boards, and antenna cables) 383477-001 15.4-inch, WXGA, TFT display assembly with BrightView for use with HP Pavilion dv4000 models (includes display cable, wireless antenna boards, and antenna cables) 383478-001 15.4-inch, WXGA, TFT display assembly for use with...

Description 384627-001 Miscellaneous Doors/Covers Kit for use with Compaq Presario V4000 models 384628-001 Screw Kit for use with full-featured HP Pavilion dv4000 models 384629-001 Base enclosure for use with full-featured HP Pavilion dv4000 models 384631-001 DVD/CD-RW Combo Drive for use with Compaq Presario...

Keyboard for use with Compaq Presario V4000 models in Korea 385739-001 Base enclosure for use with Compaq Presario V4000 models 385740-001 Screw Kit for use with defeatured HP Pavilion dv4000 models 385741-001 Screw Kit for use with full-featured Compaq Presario V4000 models 385742-001...

LightScribe for use with HP Pavilion dv4000 models 396705-001 DVD±RW and CD-RW Double Layer Combo Drive with LightScribe for use with Compaq Presario V4000 models 396706-001 DVD-ROM drive for use with HP Pavilion dv4000 models Maintenance and Service Guide Table 3-8 Illustrated Parts Catalog 3–33...

Number Description 396707-001 DVD-ROM drive for use with Compaq Presario V4000 models 397858-001 Top cover for use with full-featured HP Pavilion dv4000 models (includes TouchPad) 397859-001 Top cover for use with full-featured Compaq Presario V4000 models (does not include TouchPad)

Sequential Part Number Listing (Continued) Spare Part Number Description 403925-001 Display Label Kit for use with HP Pavilion dv4000 models 403926-001 Display Label Kit for use with Compaq Presario V4000 models 404369-001 Rubber feet for use with HP Pavilion dv4000 models...

# of Screws Removed 1 loosened to remove the thermal cover 4 removed to remove the heat sink 1 loosened 3 on Compaq Presario V4000 models 11 on HP Pavilion dv4000 models 4 on Compaq Presario V4000 models Maintenance and Service Guide...

✎ The hard drive cover is included in the Miscellaneous Doors/Covers Kits, spare part number 383469-001 (for use with HP Pavilion dv4000 models) and spare part number 384627-001 (for use with Compaq Presario V4000 models). Removing the Hard Drive Cover 5–8...

✎ The memory module compartment cover is included in the Miscellaneous Doors/Covers Kits, spare part number 383469-001 (for use with HP Pavilion dv4000 models) and spare part number 384627-001 (for use with Compaq Presario V4000 models). Removing the Memory Module Compartment Cover 5–16...

✎ Steps 2 and 3 apply to Compaq Presario V4000 models. 2. Turn the computer upside down with the rear panel toward you. 3. Remove the three Phillips PM2.5×7.0 screws that secure the switch cover to the computer. Removing the Switch Cover Screws, Compaq Presario V4000 Models Maintenance and Service Guide Removal and Replacement Procedures...

5. Disconnect the wireless antenna cables from the Mini PCI communications module 1. 6. Remove the cables from the clip 2 in the base enclosure. 7. Remove the two Phillips PM2.5×7.0 screws 3 that secure the display assembly to the computer. Removing the Display Screws Maintenance and Service Guide Removal and Replacement Procedures...

Removal and Replacement Procedures 8. Turn the computer right-side up with the front toward you. 9. Open the display as far as possible. 10. Remove the wireless antenna cables 1 from the clips in the top cover. 11. Disconnect the display cable from the system board 2. Removing the Wireless Antenna Cables 5–36 Maintenance and Service Guide...

13. Remove the display assembly 2. Removing the Display Assembly ✎ Steps 14 through 25 apply to HP Pavilion dv4000 models. See steps 26 through 38 in this section to disassemble the display assembly on Compaq Presario V4000 models. Maintenance and Service Guide Removal and Replacement Procedures 5–37...

Removal and Replacement Procedures Display Assembly Subcomponents Spare Part Number Information Display Plastics Kit for use with HP Pavilion dv4000 models, includes: ■ Display bezel ■ Display enclosure 14. Remove the six rubber screw covers 1 and 2 and six PM2.5×7.0 screws 3 that secure the display bezel to the display assembly.

2 of the display bezel until the bezel disengages from the display assembly. 16. Remove the display bezel 3. Removing the Display Bezel, HP Pavilion dv4000 Models Maintenance and Service Guide Removal and Replacement Procedures 5–39...

Removal and Replacement Procedures Display Assembly Subcomponents Spare Part Number Information Display Hinge Kit for use with HP Pavilion dv4000 models, includes: ■ Display release hooks ■ Display hinges 17. Remove the Phillips PM2.5×5.0 screws 1 that secure each display release hook to the display enclosure.

Display Assembly Subcomponents Spare Part Number Information Display Hinge Kit for use with HP Pavilion dv4000 models, includes: ■ Display hinges ■ Display release hooks 19. Remove the three Phillips PM2.5×7.0 screws 1 that secure each display hinge to the display enclosure.

Display Panel Kit (includes display inverter and display cable) 21. Remove the six Phillips PM2.5×5.0 screws 1 that secure the display panel to the display enclosure. 22. Remove the display panel 2. Removing the Display Panel, HP Pavilion dv4000 Models 5–42 403918-001 Maintenance and Service Guide...

Display Assembly Subcomponents Spare Part Number Information Wireless antenna for use with HP Pavilion dv4000 models (includes cable and transceiver) 23. Release the retention tabs 1 built in to the display enclosure shield that secure the wireless antenna cables to the display enclosure.

Removal and Replacement Procedures Display Assembly Subcomponents Spare Part Number Information Display Plastics Kit for use with Compaq Presario V4000 models, includes: ■ Display bezel ■ Display enclosure ■ Display hinge covers 26. Remove the six rubber screw covers 1 and 2 and six PM2.5×7.0 screws 3 that secure the display bezel to the display assembly.

27. Flex the inside edges of the left and right sides 1 of the display bezel and the inside edges of the top and bottom sides 2 of the display bezel until the bezel disengages from the display assembly. 28. Remove the display bezel 3. Removing the Display Bezel, Compaq Presario V4000 Models Maintenance and Service Guide Removal and Replacement Procedures...

Removal and Replacement Procedures Display Assembly Subcomponents Spare Part Number Information Display Hinge Kit for use with Compaq Presario V4000 models, includes: ■ Display release loop ■ Display hinges ■ Display hinge covers 29. Remove the two Phillips PM2.5×5.0 screws 1 that secure the display release loop to the display enclosure.

Display Assembly Subcomponents Spare Part Number Information Display Hinge Kit for use with Compaq Presario V4000 models, includes: ■ Display hinge covers ■ Display hinges ■ Display release loop 31. Remove the display hinge covers 1. 32. Remove the three Phillips PM2.5×7.0 screws 2 that secure each display hinge to the display enclosure.

Removal and Replacement Procedures Display Assembly Subcomponents Spare Part Number Information Display Panel Kit (includes display inverter and display cable) 34. Remove the six Phillips PM2.5×5.0 screws 1 that secure the display panel to the display enclosure. 35. Remove the display panel 2. Removing the Display Panel, Compaq Presario V4000 Models 5–48 403918-001...

Display Assembly Subcomponents Spare Part Number Information Wireless antenna for use with Compaq Presario V4000 models (includes cable and transceiver) 36. Release the retention tabs 1 built in to the display enclosure shield that secure the wireless antenna cables to the display enclosure.

3. Remove the following screws: 1 One Phillips PM2.5×7.0 screw 2 Two Phillips PM2.0×16.0 screws Removing the Base Enclosure Screws, Part 1, Compaq Presario V4000 Models Maintenance and Service Guide Removal and Replacement Procedures 5–55...

Removal and Replacement Procedures 4. Turn the computer upside down with the front toward you. 5. Remove the following screws: 1 Nine Phillips PM2.5×7.0 screws 2 Four Phillips PM2.0×4.0 screws 6. Disconnect the speaker cable 3. Removing the Base Enclosure Screws, Part 2, Compaq Presario V4000 Models 5–56 Maintenance and Service Guide...

Switch cover e. Keyboard f. Display assembly g. Top cover (HP Pavilion dv4000 models, h. Base enclosure (Compaq Presario V4000 models, Section 2. Turn the computer upside down with the front toward you. 3. Disconnect the speaker cable from the system board.

Removal and Replacement Procedures ✎ Steps 4 through 18 apply to HP Pavilion dv4000 models. See steps 19 through 25 in this section to remove the system board on Compaq Presario V4000 models. 4. Turn the computer top side up with the front toward you.

Removal and Replacement Procedures ✎ Steps 11 through 18 provide instructions for removing the USB board and frame on HP Pavilion dv4000 models. Refer to Section 5.21, “USB Board,” USB board and frame on Compaq Presario V4000 models. 11. Disconnect the audio 1, USB 2, and Bluetooth cables 3 from the system board.

Removal and Replacement Procedures ✎ Steps 19 through 25 apply to Compaq Presario V4000 models. 19. Turn the top cover right-side up with the front toward you. 20. Disconnect the audio 1, USB 2, and Bluetooth cables 3 from the system board. Disconnecting the System Board Cables, Compaq Presario V4000 Models 5–70...

21. Release the ZIF connector to which the TouchPad cable is attached and disconnect the cable 1 from the system board. 22. Remove the two Phillips PM2.0×4.0 screws 2 that secure the system board to the top cover. Removing the System Board Screws, Part 1, Compaq Presario V4000 Models Maintenance and Service Guide Removal and Replacement Procedures...

This chapter provides physical and performance specifications. Dimensions Height Width Depth Weight Full-featured model with 15.4-inch display, optical drive and 12-cell battery pack Input Power Operating voltage Operating current Temperature Operating Nonoperating Maintenance and Service Guide Specifications Table 6-1 Computer Metric 3.35 cm 35.85 cm...

15.4-inch, WXGA, TFT Display Dimensions Height Width Diagonal Number of colors Contrast ratio Brightness Pixel resolution Pitch Format Configuration Backlight Character display Total power consumption Viewing angle Maintenance and Service Guide Table 6-2 20.9 cm 33.1 cm 39.1 cm Up to 16.8 million 200:1 180 nits typical 0.259 ×...

Screw Listing Where used: One screw that secures the optical drive to the computer (documented in Section 5.6) Three screws that secure the switch cover on Compaq Presario V4000 models computer (documented in Two screws that secure the display assembly to the computer (documented Section 5.14) Phillips PM2.5×7.0 Screw Locations...

Phillips PM2.5×7.0 Screw (Continued) Where used: 4 screws that secure the display assembly to the computer (documented in Section 5.14) Phillips PM2.5×7.0 Screw Locations Maintenance and Service Guide Table C-3 Color Qty. Length Black 7.0 mm Screw Listing Head Thread Width 2.5 mm 4.5 mm...

Screw Listing Phillips PM2.5×7.0 Screw (Continued) Where used: 6 screws that secure the display bezel to the display assembly (documented in Section 5.14) Phillips PM2.5×7.0 Screw Locations C–6 Table C-3 Color Qty. Length Black 7.0 mm Maintenance and Service Guide Head Thread Width...

Phillips PM2.5×7.0 Screw (Continued) Where used: 6 screws that secure the display hinges to the display enclosure (documented in Section 5.14) Phillips PM2.5×7.0 Screw Locations Maintenance and Service Guide Table C-3 Color Qty. Length Black 7.0 mm Screw Listing Head Thread Width 2.5 mm...

Screw Listing Phillips PM2.5×7.0 Screw (Continued) Where used: One that secures the base enclosure to the Compaq Presario V4000 (documented in Section Phillips PM2.5×7.0 Screw Location C–10 Table C-3 Color Qty. Black 5.16) Length Thread 7.0 mm 2.5 mm Maintenance and Service Guide Head Width 4.5 mm...

Phillips PM2.5×7.0 Screw (Continued) Where used: 9 screws that secure the base enclosure to the Compaq Presario V4000 (documented in Section Phillips PM2.5×7.0 Screw Locations Maintenance and Service Guide Table C-3 Color Qty. Black 5.16) Screw Listing Length Thread 7.0 mm 2.5 mm Head Width...

Phillips PM2.5×7.0 Screw (Continued) Where used: 2 screws that secure the system board to the top cover on the Compaq Presario V4000 (documented in Phillips PM2.5×7.0 Screw Locations Maintenance and Service Guide Table C-3 Color Qty. Length Black 7.0 mm Section 5.18) Screw Listing...

Where used: 2 screws that secure the display release hooks to the display enclosure (documented in Section Phillips PM2.5×5.0 Screw Locations Maintenance and Service Guide Table C-4 Phillips PM2.5×5.0 Screw Color Qty. Silver 5.14) Screw Listing Length Thread 5.0 mm 2.5 mm Head Width...

Screw Listing Phillips PM2.5×5.0 Screw (Contin