lcd screen camera definition for sale

Digital cameras introduced a lot of great features to the world of photography, including the ability to look at a photo that you just shot to ensure that it looks right before you move on to another scene. If someone had his eyes closed or if the composition doesn"t look quite right, you can reshoot the image. The key to this feature is the display screen. Continue reading to understand what"s an LCD.

LCD, or Liquid Crystal Display, is the display technology used to create the screens embedded in the back of nearly all digital cameras. In a digital camera, the LCD works for reviewing photos, displaying menu options and serving as a live viewfinder.

All digital cameras contain full-color display screens. In fact, the display screen has become the preferred method of framing the scene, as only a small number of digital cameras now include a separate viewfinder and are mostly for higher-end cameras. Of course, with film cameras, all cameras had to have a viewfinder to allow you to frame the scene.

LCD screen sharpness depends on the number of pixels the LCD can display, and the camera"s specifications should list this number. A display screen that has more pixels of resolution should be sharper than one with fewer pixels.

Even though some cameras may have a display screen that uses a different display technology than LCD, the term LCD has become almost synonymous with display screens on cameras.

Additionally, some other popular cameras can make use of a touchscreen display or of an articulated display, where the screen can twist and swivel away from the camera body.

A liquid crystal display makes use of a layer of molecules (the liquid crystal substance) that are placed between two transparent electrodes. As the screen applies an electrical charge to the electrodes, the liquid crystal molecules change alignment. The amount of electrical charge determines the different colors that appear on the LCD.

The display screen consists of millions of pixels, and each individual pixel will contain a different color. You can think of these pixels as individual dots. As the dots are placed next to each other and aligned, the combination of the pixels forms the picture on the screen.

A full HDTV (FHD) has a resolution of 1920x1080, which results in a total of about 2 million pixels. Each of these individual pixels must be changed dozens of times every second to display a moving object on the screen properly. Understanding how the LCD screen works will help you appreciate the complexity of the technology used to create the display on the screen.

With a camera display screen, the number of pixels ranges from about 400,000 to maybe 1 million or more. So the camera display screen doesn"t quite offer FHD resolution. However, when you consider a camera screen usually is between 3 and 4 inches (measured diagonally from one corner to the opposite corner). In contrast, a TV screen is generally between 32 and 75 inches (again measured diagonally), you can see why the camera display looks so sharp. You"re squeezing about half as many pixels into a space that is several times smaller than the TV screen.

LCDs have become a commonplace display technology over the years. LCDs appear in most digital photo frames. The LCD screen sits inside the frame and displays the digital photos. LCD technology also appears in large screen televisions, laptop screens, and smartphone screens, among other devices.

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The LCD Monitor is used to view the menus and camera settings, playback captured images and videos, and also frame your shot (when using Live View). Some LCD Monitors are also Touch-Screens, making it easier to interface with your camera.

Glass substrate with ITO electrodes. The shapes of these electrodes will determine the shapes that will appear when the LCD is switched ON. Vertical ridges etched on the surface are smooth.

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, calculators, and mobile telephones, including smartphones. LCD screens have replaced heavy, bulky and less energy-efficient cathode-ray tube (CRT) displays in nearly all applications. The phosphors used in CRTs make them vulnerable to 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 do not have this weakness, but are still susceptible to image persistence.

Each pixel of an LCD typically consists of a layer of molecules aligned between two transparent electrodes, often made of Indium-Tin oxide (ITO) and two polarizing filters (parallel and perpendicular polarizers), the axes of transmission of which are (in most of the cases) perpendicular to each other. Without the liquid crystal between the polarizing filters, light passing through the first filter would be blocked by the second (crossed) polarizer. Before an electric field is applied, the orientation of the liquid-crystal molecules is determined by the alignment at the surfaces of electrodes. In a twisted nematic (TN) device, the surface alignment directions at the two electrodes are perpendicular to each other, and so the molecules arrange themselves in a helical structure, or twist. This induces the rotation of the polarization of the incident light, and the device appears gray. If the applied voltage is large enough, the liquid crystal molecules in the center of the layer are almost completely untwisted and the polarization of the incident light is not rotated as it passes through the liquid crystal layer. This light will then be mainly polarized perpendicular to the second filter, and thus be blocked and the pixel will appear black. By controlling the voltage applied across the liquid crystal layer in each pixel, light can be allowed to pass through in varying amounts thus constituting different levels of gray.

The chemical formula of the liquid crystals used in LCDs may vary. Formulas may be patented.Sharp Corporation. The patent that covered that specific mixture expired.

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.

LCD in a Texas Instruments calculator with top polarizer removed from device and placed on top, such that the top and bottom polarizers are perpendicular. As a result, the colors are inverted.

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 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:

Until Gen 8, manufacturers would not agree on a single mother glass size and as a result, different manufacturers would use slightly different glass sizes for the same generation. Some manufacturers have adopted Gen 8.6 mother glass sheets which are only slightly larger than Gen 8.5, allowing for more 50 and 58 inch LCDs to be made per mother glass, specially 58 inch LCDs, in which case 6 can be produced on a Gen 8.6 mother glass vs only 3 on a Gen 8.5 mother glass, significantly reducing waste.AGC Inc., Corning Inc., and Nippon Electric Glass.

In 1922, Georges Friedel described the structure and properties of liquid crystals and classified them in three types (nematics, smectics and cholesterics). In 1927, Vsevolod Frederiks devised the electrically switched light valve, called the Fréedericksz transition, the essential effect of all LCD technology. In 1936, the Marconi Wireless Telegraph company patented the first practical application of the technology, "The Liquid Crystal Light Valve". In 1962, the first major English language publication Molecular Structure and Properties of Liquid Crystals was published by Dr. George W. Gray.RCA found that liquid crystals had some interesting electro-optic characteristics and he realized an electro-optical effect by generating stripe-patterns in a thin layer of liquid crystal material by the application of a voltage. This effect is based on an electro-hydrodynamic instability forming what are now called "Williams domains" inside the liquid crystal.

In the late 1960s, pioneering work on liquid crystals was undertaken by the UK"s Royal Radar Establishment at Malvern, England. The team at RRE supported ongoing work by George William Gray and his team at the University of Hull who ultimately discovered the cyanobiphenyl liquid crystals, which had correct stability and temperature properties for application in LCDs.

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,

In 1983, researchers at Brown, Boveri & Cie (BBC) Research Center, Switzerland, invented the passive matrix-addressed LCDs. H. Amstutz et al. were listed as inventors in the corresponding patent applications filed in Switzerland on July 7, 1983, and October 28, 1983. Patents were granted in Switzerland CH 665491, Europe EP 0131216,

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 1990, under different titles, inventors conceived electro optical effects as alternatives to twisted nematic field effect LCDs (TN- and STN- LCDs). One approach was to use interdigital electrodes on one glass substrate only to produce an electric field essentially parallel to the glass substrates.Germany by Guenter Baur et al. and patented in various countries.Hitachi work out various practical details of the IPS technology to interconnect the thin-film transistor array as a matrix and to avoid undesirable stray fields in between pixels.

Hitachi also improved the viewing angle dependence further by optimizing the shape of the electrodes (Super IPS). NEC and Hitachi become early manufacturers of active-matrix addressed LCDs based on the IPS technology. This is a milestone for implementing large-screen LCDs having acceptable visual performance for flat-panel computer monitors and television screens. In 1996, Samsung developed the optical patterning technique that enables multi-domain LCD. Multi-domain and In Plane Switching subsequently remain the dominant LCD designs through 2006.South Korea and Taiwan,

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,

In 2016, Panasonic developed IPS LCDs with a contrast ratio of 1,000,000:1, rivaling OLEDs. This technology was later put into mass production as dual layer, dual panel or LMCL (Light Modulating Cell Layer) LCDs. The technology uses 2 liquid crystal layers instead of one, and may be used along with a mini-LED backlight and quantum dot sheets.

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.

Monochrome LEDs: such as red, green, yellow or blue LEDs are used in the small passive monochrome LCDs typically used in clocks, watches and small appliances.

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).

The LCD backlight systems are made highly efficient by applying optical films such as prismatic structure (prism sheet) to gain the light into the desired viewer directions and reflective polarizing films that recycle the polarized light that was formerly absorbed by the first polarizer of the LCD (invented by Philips researchers Adrianus de Vaan and Paulus Schaareman),

A pink elastomeric connector mating an LCD panel to circuit board traces, shown next to a centimeter-scale ruler. The conductive and insulating layers in the black stripe are very small.

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.

The LCD panel is powered by LCD drivers that are carefully matched up with the edge of the LCD panel at the factory level. The drivers may be installed using several methods, the most common of which are COG (Chip-On-Glass) and TAB (Tape-automated bonding) These same principles apply also for smartphone screens that are much smaller than TV screens.anisotropic conductive film or, for lower densities, elastomeric connectors.

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.

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.

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 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.

This pixel-layout is found in S-IPS LCDs. A chevron shape is used to widen the viewing cone (range of viewing directions with good contrast and low color shift).

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.

Blue phase mode LCDs have been shown as engineering samples early in 2008, but they are not in mass-production. The physics of blue phase mode LCDs suggest that very short switching times (≈1 ms) can be achieved, so time sequential color control can possibly be realized and expensive color filters would be obsolete.

Some LCD panels have defective transistors, causing permanently lit or unlit pixels which are commonly referred to as stuck pixels or dead pixels respectively. Unlike integrated circuits (ICs), LCD panels with a few defective transistors are usually still usable. Manufacturers" policies for the acceptable number of defective pixels vary greatly. At one point, Samsung held a zero-tolerance policy for LCD monitors sold in Korea.ISO 13406-2 standard.

Dead pixel policies are often hotly debated between manufacturers and customers. To regulate the acceptability of defects and to protect the end user, ISO released the ISO 13406-2 standard,ISO 9241, specifically ISO-9241-302, 303, 305, 307:2008 pixel defects. However, not every LCD manufacturer conforms to the ISO standard and the ISO standard is quite often interpreted in different ways. LCD panels are more likely to have defects than most ICs due to their larger size. For example, a 300 mm SVGA LCD has 8 defects and a 150 mm wafer has only 3 defects. However, 134 of the 137 dies on the wafer will be acceptable, whereas rejection of the whole LCD panel would be a 0% yield. In recent years, quality control has been improved. An SVGA LCD panel with 4 defective pixels is usually considered defective and customers can request an exchange for a new one.

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.

In 2004, researchers at the University of Oxford demonstrated two new types of zero-power bistable LCDs based on Zenithal bistable techniques.e.g., BiNem technology, are based mainly on the surface properties and need specific weak anchoring materials.

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.

Usually no refresh-rate flicker, because the LCD pixels hold their state between refreshes (which are usually done at 200 Hz or faster, regardless of the input refresh rate).

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.

LCDs can be made 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.

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.

Limited viewing angle in some older or cheaper monitors, causing color, saturation, contrast and brightness to vary with user position, even within the intended viewing angle. Special films can be used to increase the viewing angles of LCDs.

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.

Dead or stuck pixels may occur during manufacturing or after a period of use. A stuck pixel will glow with color even on an all-black screen, while a dead one will always remain black.

In a constant-on situation, thermalization may occur in case of bad thermal management, in which part of the screen has overheated and looks discolored compared to the rest of the screen.

Loss of brightness and much slower response times in low temperature environments. In sub-zero environments, LCD screens may cease to function without the use of supplemental heating.

The production of LCD screens uses nitrogen trifluoride (NF3) as an etching fluid during the production of the thin-film components. NF3 is a potent greenhouse gas, and its relatively long half-life may make it a potentially harmful contributor to global warming. A report in Geophysical Research Letters suggested that its effects were theoretically much greater than better-known sources of greenhouse gasses like carbon dioxide. As NF3 was not in widespread use at the time, it was not made part of the Kyoto Protocols and has been deemed "the missing greenhouse gas".

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.

Explanation of CCFL backlighting details, "Design News — Features — How to Backlight an LCD" Archived January 2, 2014, at the Wayback Machine, Randy Frank, Retrieved January 2013.

Energy Efficiency Success Story: TV Energy Consumption Shrinks as Screen Size and Performance Grow, Finds New CTA Study; Consumer Technology Association; press release 12 July 2017; https://cta.tech/News/Press-Releases/2017/July/Energy-Efficiency-Success-Story-TV-Energy-Consump.aspx Archived November 4, 2017, at the Wayback Machine

LCD Television Power Draw Trends from 2003 to 2015; B. Urban and K. Roth; Fraunhofer USA Center for Sustainable Energy Systems; Final Report to the Consumer Technology Association; May 2017; http://www.cta.tech/cta/media/policyImages/policyPDFs/Fraunhofer-LCD-TV-Power-Draw-Trends-FINAL.pdf Archived August 1, 2017, at the Wayback Machine

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.

Jack H. Park (January 15, 2015). "Cut and Run: Taiwan-controlled LCD Panel Maker in Danger of Shutdown without Further Investment". www.businesskorea.co.kr. Archived from the original on May 12, 2015. Retrieved April 23, 2015.

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.

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The Liquid Crystal Display (LCD) technology uses light emitting crystals to display images. The crystals are regulated by a computer and are able to show various light colours, and intensities as required. This modulation allows an array of such crystals to form a display. Most modern DSLR cameras use LCD screens to display the images taken by the camera. LCD screens on cameras are in ‘True’ colour (True colour = 16,777,216 colours).

DSLRs, bridge cameras, point-and-shoot cameras and compact cameras all have LCD screens although not all have true colour displays. The sharpness of the LCD screen depends on the resolution of the screen. This is the number of pixels the LCD can display. High resolution screens appear on the high-end cameras and are more expensive. Owing to crystal size only a certain number of crystals can appear in the limited size of the screen on the back of a camera. The high-end cameras may have resolutions approaching 5 million pixels. However, compared to the ability of some cameras to image at resolutions over over 40 million pixels (40 Mega-pixels) there is inevitably a loss of some resolution in the image displayed on the back of a camera.

In simple terms, a live view LCD is the large LCD on the back of the digital SLR camera that lets you preview the photo you"re about to take. This provides you with a second way of composing your photos - the first would involve looking through the viewfinder. Thus, Live View is the alternative (electronic) viewfinder to using the (optical) viewfinder on a DSLR camera that you would normally use.

Bring your creativity to life with the Nikon D5600 digital camera. It features 24.2 effective megapixels, an EXPEED 4 image-processing engine, and has an ISO range of 100-25600 that captures beautiful and vibrant images and time-lapse movies even in low light situations. With Bluetooth and the Nikon SnapBridge app of the camera you can transfer the images to your compatible smart devices. Enjoy ease-of-use and intuitive control with the D5600’s touch interface.

Scroll through images swiftly with the all-new frame advance bar, or easily trim an area of the image by pinching it out. The touch feature lets you make adjustments to a pre-assigned camera setting using your thumb, without looking away from the viewfinder, including auto sensitivity control on/off switching.

The camera features a vari-angle touch screen LCD monitor, which not only allows users to shoot self-portraits, but also makes low-angle and high-angle shooting easier, even when holding the camera in a vertical orientation.

Handy and economical, the Sony Alpha 24.3MP Digital SLR Camera lets you take your imaging beyond the capability of a DSLR. Ideal to be carried for your hiking and trekking trips, the Sony mirrorless camera has a large image sensor and bright lenses that make the best use of the light you have. The smart image processor ensures sharp, low-noise images even without a flash. The rechargeable battery, tiltable screens and customization make it an easy upgrade for any image enthusiast.

Sony A5100 is a perfect camera for travellers due to its amazing quality of pictures and videos. Moreover, its rotating screen helps to provide a good reference while selfies.

It works in real-time, which means that you can check details, such as the degree of background blur (bokeh), brightness and color vividness on the rear LCD monitor before you press the shutter button.

The Panasonic Lumix DC-FZ10002 is a hybrid camera that lets you capture stunning pictures. It boasts of a superior 16x optical zoom LEICA lens with the minimum aperture extended to F11, a high-performance sensor, creative 4K feature and a responsive shooting. The FZ1000 II captures crisp and clear images with minimal noise, thanks to the 1-inch incorporated High-Sensitivity MOS sensor.

RF2C82CC6–Vertical rear view shot of a digital camera showing a big blank LCD screen on a white background. Camera is mounted to a Gimbal Head on a tripod.

RF2C82AA2–Vertical rear view shot of a digital camera showing a big blank LCD screen on a white background. Camera is mounted to a Gimbal Head on a tripod.

RF2H0XR0W–Professional wedding photographer looking through LCD screen of digital camera composing before taking pictures. Bokeh background. Selective focus.

RF2HJ8560–Image of donuts and a glass of milk top view in a lcd Screen of a DSLR or Mirrorless camera with rim light on top, concept of food photography

The viewfinder is your window to the world as a photographer – despite advancements in camera technology, the humble viewfinder remains relatively unchanged.

An electronic viewfinder is a small display that shows the scene you have in front of the camera. With an electronic viewfinder (EVF), you can see exactly what your sensor sees.

With some cameras, you can connect an external camera screen (see our guide) which mimics the EVF’s display, allowing you to see fine details and colours even clearer.

With optical viewfinders, the image may be different from the view because you’re not seeing the effect of the settings. In other words, if you change camera settings like aperture or shutter speed, it won’t be reflected in the viewfinder.

It depends on the type of photography that you do, but the general answer would be yes. We’re getting used to taking a picture using only an LCD screen because of our smartphone cameras. However, in most situations, a viewfinder will help you improve your framing and composition.

Most DSLR cameras have an optical viewfinder. That means that you see the same thing as your lens, which means that it’s not affected by the exposure settings.

Photographers look through the viewfinder to get a better view of what they are shooting. For example, when you’re shooting on a bright sunny day, you can’t see many details on the LCD screen.

Yes, you can buy an external viewfinder for your camera. There are electronic and optical viewfinders on the market, and they can be attached to your camera via the hot shoe.

The main difference between viewfinders and LCD screens is in the way you see the scene that’s in front of you. On the LCD screen, you can see a digital representation of it, like looking at the tv. With an optical viewfinder, you’re seeing things through a piece of glass – it can be compared to looking through a window or a pair of binoculars.

Also, with a viewfinder (both OVF and EVF) you don’t have to deal with glare, you have a steadier hold of the camera, and you get better peripheral vision when you shoot.

The viewfinder helps you to frame and compose in the best possible way. Many photographers can’t live without a viewfinder on their camera, whether it’s electronic or optical.

It depends on the camera brand and model. Most entry-level mirrorless cameras don’t have a viewfinder. However, if you can spend a little bit more, you’ll find mirrorless cameras with built-in electronic viewfinders.

Hopefully, this article cleared up some of your doubts about viewfinders and how they can be used to take the possible image with your camera – whether it be analogue or digital.

An articulating or vari-angle LCD – commonly called a flip screen – is a useful addition to a camera. The screen is mounted on a swivel, allowing you to flip the screen away from the camera body and rotate the LCD 360 degrees.

Flip screens have traditionally been useful for taking photos at unusual angles. For instance, framing a bug’s-eye view from ground level used to mean setting your camera down low and awkwardly trying to see through the optical viewfinder. There was usually a lot of guesswork involved.

With a vari-angle, or flip screen, you can now set the camera up at ground level and angle the articulating LCD up towards you and frame the scene in live view.

Likewise, a flip screen allows you to shoot overhead by swivelling the screen down. Street photographers might also appreciate a swivel screen because it can let you shoot more discreetly. Shooting from the hip is a lot easier with a flip screen and gives you more control. Hold the camera against your body and angle the swivel screen upwards so you can frame your shot, then shoot discreetly.

Despite all these advantages for shooting stills, it’s probably the rise of vlogging that has seen the popularity of cameras with flip screens soar. Like shooting self-portraiture, vlogging requires placing yourself on the other side of the camera, and before flip screens were a thing this required a lot of careful setup and trial and error.

But swivel LCD touchscreens mean you can now place your camera in front of you, frame your shot accordingly and simply tap the screen to take a picture or start recording. If you have even modest ambitions to post videos on YouTube, a camera with an articulating screen will undoubtedly be the best option for you. In this guide we’ll round up the best cameras with flip screens.

The Canon EOS R5 leaves little doubt that Canon is now serious about the mirrorless camera market. It has phenomenal specification with features like a 45Mp full-frame sensor, phase detection autofocusing that covers the whole frame, eye AF for humans and animals that works in video and stills mode and a class-leading viewfinder paired with a vari-angle touchscreen.

The Canon EOS R5 is built to a similar standard to the Canon EOS 5D Mark IV and has a magnesium alloy construction along with weatherproof seals. Its handling is also similar, but the control arrangement has changed to accommodate the vari-angle screen.

It’s great to have a vari-angle screen on the EOS R5. It makes it much easier to shoot video from above or below head-height while keeping the kit size and weight down. Also, as the screen is touch-sensitive you can control the camera with a few taps.

While the R6’s viewfinder is the same size as the R5’s (it’s a 0.5-inch type), its resolution is lower at 3.69million dots instead of 5.76million. That’s the same as in the EOS R and on par with the electronic viewfinders in the Sony A9 and Nikon Z7. It’s a great EVF specification for a camera of this level.

There’s also a 3-inch vari-angle touchscreen with 1.62million dots. We’re a fan of vari-angle screens because they make shooting portrait or landscape format images from above or below head-height much easier than a fixed screen. And a tilting screen is only of help with landscape format images.

Both the viewfinder and the screen provide an accurate preview of the image as it will be captured. Overall, Canon’s control arrangement on the R6 and use of touch control is excellent and the vari-angle screen is a real asset.

After we reviewed the Sony A7 III, a flip-out touchscreen was at the top of our wishlist for improvements we’d like to see on the next iteration of Sony’s full-frame all-rounder. Sure enough, Sony has given the A7 IV a vari-angle screen that can be flipped face forward or be angled to help compose low- or high-level shots in either landscape of portrait orientation.

What’s more, the A7 IV’s 3-inch 1,036,800-dot screen is touch-sensitive and users can now navigate the menus and settings with a tap. In previous Sony touchscreen LCDs, you were limited to setting the AF point via touch.

Sony has also carefully thought through the design, as well, placing the A7 IV’s mic port just above the screen on the side of the camera so it can still move freely when an external mic is plugged in.

OM System has given the OM-1 a very bright 1.62-million dot vari-angle touchscreen. It’s a 3-inch screen and like on the OM-D E-M1 III and OM-D E-M1X and it’s mounted on a vari-angle hinge. This vari-angle hinge means the screen can be angled for clear visibility whether you’re shooting in landscape or portrait orientation.

Like the screens on existing Olympus Micro Four Thirds cameras, the OM-1’s screen is touch sensitive. It responds quickly to a tap and it’s a shame that OM System’s hasn’t extended the touch control to the new main menu.

In overcast conditions and indoors, the OM-1’s screen gives an excellent view it also performs well in brighter conditions. my toughest test for this was when skiing on a bright sunny day trying to video my companions ahead of me. Keeping them framed as we all moved over the piste was challenging, but thankfully, I was able to see them on the screen.

Although Panasonic Lumix S5 is smaller than the GH5, it has a well-proportioned and ergonomically shaped grip. A rubber-like coating also ensures that the camera feels secure in your hand. It’s also weather-sealed so you don’t need to worry if the weather changes when you’re out on a shoot.

Despite the shrinkage in size and weight, the Panasonic Lumix s5 has both a 3-inch 1,840,000-dot vari-angle touchscreen and a 2,360,000-dot OLED electronic viewfinder built-in.

The Panasonic GH5 has a vari-angle screen and it was high on the request list for the S-series camera when their development announcement was made. However, the S1 and S1R have 3-way tilting screens. These are useful if you’re shooting in landscape and portrait format images, but they’re not as intuitive or flexible to use as a vari-angle screen and they can’t be seen from in front of the camera.

Happily, the Lumix S5’s screen delivers what many were hoping for and it can be flipped around to face forwards. It means that the S5 could also be a good full-frame vlogging camera.

Further good news is that, like the viewfinder, the S5’s screen provides an excellent preview of the image. If you’re shooting outdoors in bright conditions it’s worth activating the Live View Boost to brighten screen to make the scene easier to see. The screen is also very responsive to touch.

The Panasonic GH6 has a 3.0-inch 1,840K-dot tilt and free-angle touchscreen with an aspect ratio of 3:2 on its rear. The tilting aspect of the screen isn’t immediately obvious, but pressing the button underneath the monitor’s bottom left corner releases the mechanism so the screen can be tilted up from the bottom.

There are two stop points in the screen’s tilt movement. The first one is at the right point to enable the screen to be flipped out to the side of the camera without catching on the viewfinder while the second one at about 45° gives a more comfortable viewing able when shooting at waist-height.

To the uninitiated, the tilt and free-angle combination may seem a bit over the top but it means that the screen can be flipped out and twisted to face forwards, up or down, without fouling on any of the cables that may be connected to the ports on the left side of the camera (mic, USB-C and full-size HDMI).

With 1.84-million dots, the 3-inch screen gives a good view of the scene and doesn’t suffer to badly from reflections even in sunny conditions (at least not in March in the UK). However, even when shooting video, there are times when it’s preferable to use the 3,680k-dot 0.76x OLED viewfinder. This has a contrast ratio of 10,000:1 and gives a sharp, accurate preview of the scene.

The GH5 is Panasonic’s flagship compact system or mirrorless camera and it has a mini-DSLR design, featuring a high-quality electronic viewfinder and vari-angle touch-screen. As a Micro Four Thirds camera it’s compatible with an extensive collection of Micro Four Thirds mount lenses from Panasonic and Olympus as well as third-party manufacturers.

Panasonic has also upgraded the rear screen and it now measures 3.2-inches across the diagonal and has 1,620,000 dots. It’s still a vari-angle unit but instead of an OLED screen it’s an RGBW LCD. It provides a nice sharp view and the revised menu, which has fewer pages but more lines, is clear. The screen also responds quickly to tap of your finger.

The GH5 is a complex camera and it will take some getting to know, but all the main controls that you want on a shot-by-shot basis, for example to adjust exposure and white balance or to set the AF point are within easy reach. There are also plenty of customisable buttons to help you get it working as you want.

As well as a host of improvements to its video specification, the Sony A7S III introduces the highest-resolution electronic viewfinder we’ve seen to date and it’s the first Sony A7-series camera to feature a vari-angle screen.

According to Sony, the 3-inch vari-angle screen wasn’t a request for the A7S III, it was a demand. It’s certainly something I’ve mentioned on many occasions.

In the past, the argument against one has been that a vari-angle hinge is less robust than a fixed screen and that ‘most dedicated videographers use an external monitor’. Those two points may still be true, but one of the key benefits of using a camera like the A7S III is its small size. If you start having to add an external monitor it makes it bigger and heavier.

It’s good to see that there’s an option to show a red outline around the on-screen image when the camera is recording. There are times when this is more useful than the usual flashing red dot.

After the 8K-capabilities of the Canon EOS R5, the Sony A7S III might seem a bit of an anti-climax. We’re sure some videographers were hoping for a big jump in resolution from the 12mp A7S II. However, Sony already has the 61Mp A7R IV and the 24Mp A7 III, so sticking with 12Mp means that the A7S III has even better low-light capability than its predecessor but with a much better autofocus system, a vari-angle screen and the highest-resolution viewfinder around.

As with Canon’s full-frame mirrorless cameras, including the flagship Canon EOS R3, the R7 has a vari-angle touchscreen. This is great for composing low- and high-level shots in landscape or portrait orientation. Because Canon has embraced full-touch control, it’s also useful for changing camera settings with a tap.

Overall, Canon’s new flagship APS-C mirrorless camera has a layout and design all of its own, yet it retains some of those signature Canon design marks that will help people quickly adapt to using it.

Although the 0.39-inch 2.36million-dot electric viewfinder on the Canon EOS RP doesn’t match those in recent high-end mirrorless cameras for resolution, it still provides a decent preview of images. And let’s not forget, the RP is much more affordable than other new full-frame mirrorless cameras.

With Exposure Simulation activated, you get an accurate view of the final image’s brightness as well as the colour. However, if you want to see the depth of field, you’ll need to customise one of the camera’s buttons to that purpose. Or of course, you can take a quick shot. That could be avoided, however, if Canon showed the preview with the selected aperture applied.

Like the EVF, the 3-inch screen’s 1.04-million-dot resolution doesn’t really wow these days, but the fact that it’s mounted on a vari-angle hinge is great. That means you can twist it around to give you a clear view whichever angle you’re shooting from. And unlike a tilting screen, it’s useful if you’re shooting in portrait or landscape orientation.

We love that Canon has enabled the RP’s touchscreen to be used for browsing the Quick and main menu, selecting settings and browsing through images as well as setting the AF point. It really speeds using the camera and makes it more intuitive. It’s also good that this isn’t at the expense o