lcd screen camera definition in stock

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.

LCD screens are great, and the quality improves with each new generation of DSLR cameras appearing on the market. But, many professional photographers prefer to use a camera"s viewfinder. We explain the benefits and disadvantages of each.

LCD screens have advantages, but so do optical viewfinders. When it"s time to frame a photo with your DSLR camera, you need to decide which side of the viewfinder vs. LCD debate you lean. Unlike the optical viewfinder, the LCD screen displays the entire frame that the sensors capture. Optical viewfinders, even on a professional level DSLR, only show 90-95% of the image. You lose a small percentage on the edges of the image.

Digital SLRs aren"t light, and it"s easier to produce a crisp, sharp image when you hold the camera up to your eye to use the viewfinder. That way, you can support and steady the camera and lens with your hands. But, viewfinders are generally smaller than LCD screens. Viewfinders are also less convenient to use, especially if you wear glasses.

At the end of the day, though, as intelligent as digital cameras are, the human eye can resolve more detail than an LCD screen. You get a sharper and more accurate view of your image by using the viewfinder.

The biggest drawback with LCD screens is probably shooting in sunlight. Depending on the quality of the screen, you may not be able to use it in bright sunshine because of the glare. All you see are reflections off the screen. Also, the crystals contained within LCD screens tend to flare in bright sunlight, making the situation worse.

Holding the camera at arm"s-length while looking at the LCD screen—and then keeping the camera steady while zooming in on a subject—takes effort. When you use the LCD screen this way, you often end up with a blurry image.

No matter how good an LCD screen is, it"s unlikely to give an accurate overview of the image you took. Most overexpose an image by as much as one full stop. It"s best to acquire the technical knowledge about photography, rather than rely on the LCD screen to determine image quality. With this technical knowledge, you"ll have the confidence your settings are correct, and your images are properly exposed. So, in most cases, it"s best to use the viewfinder. But, if you like the convenience of an LCD, or you wear glasses, use the LCD. It"s mostly a matter of personal preference.

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 LCD screen on digital cameras cuts out the need for this process as images can be viewed immediately after they are taken and adjustments can be made to improve your shots straight away.

If you like to record your images settings for future analysis, most digital cameras will do this for you – to be viewed later either on your camera (using the ‘info’ function when in playback on many cameras) or on your computer.

One question I get asked a lot by readers is whether they should use their digital camera’s LCD screen or viewfinder to frame their shots. I suspect that the majority of camera owners do use the LCD but there are a number of arguments both for and against it. Let me explore a few:

Convenience – Perhaps the main reason that people use the LCD is convenience. Rather than having to fire up the camera, raise it to your eye, squint through it (on many point and shoot models it’s quite small) etc… using the LCD means you simply switch the camera on and from almost any position you can snap a shot.

Size – As I hinted above – many models of digital cameras have very small view finders and when compared with the LCD (usually between 1.5 and 2.5 inches these days) there is really not that much of a comparison.

Instant Playback – shooting with the LCD means that after you take your shot you will immediately see the shot you’ve taken flashed onto the screen. You can see this if you use the viewfinder too by lowering the camera but it adds another action to the process.

Creativity – using the LCD opens up all kinds of creative opportunities for your photography by meaning that you don’t have to have the camera at eye level to be able to get your framing right. You can instead put it up high or down low and still be able to line things up well.

Framing Inaccuracy of Optical Viewfinders on Point and Shoots – one of the most common complaints about using the viewfinder on digital cameras is that what you see through it is slightly different to what the camera is actually seeing as the view finder is generally positioned above and to the left of the lens which means it is slightly different (a problem called parallax). Most viewfinders that have this will give you a guide as to where to frame your shot but it can be a little difficult – especially when taking close up/macro shots. (note that not all point and shoot cameras have optical viewfinders – some have electronic ones (see below).

Obstructed View – on some models of point and shoot digital cameras a fully extended zoom can actually obstruct the view from your viewfinder. This can be quite frustrating.

Glasses Wearers – if you wear glasses you might find using the viewfinder of your Digital camera more difficult. Many these days do come with a little diopter adjuster to help with this.

Battery Killer– the LCD on your camera chews up battery power faster than almost any other feature on your camera. Use it not only for viewing shots taken but lining them up and you’ll need to recharge a lot more regularly.

Camera Shake – when shooting with the LCD as a viewfinder you need to hold your camera away from your body (often at arms length). This takes the camera away from your solid and still torso and into midair (only supported by your outstretched arms) – this increased the chance that your camera will be moving as you take the shot which will result in blurry shots.

Competing Light – one problem that you will often have with framing your shots using the LCD is that for many cameras, shooting in bright light will make it difficult to see the LCD – leaving it looking washed out. Digital camera manufacturers are trying to overcome this with brighter and clearer screens but using the viewfinder instead of the LCD will generally overcome the problem.

DSLRs – most DSLRs do not give you the opportunity to use the LCD as a viewfinder at all. I suspect that this feature will become more available however as I hear it being asked for quite a bit. I’m not sure I’d ever use it though as DSLR view finders are generally larger and are a WYSIWYG (what you see is what you get) meaning you can be sure that what you’re looking at through the view finder is what the image will be when you shoot.

Electronic View Finders (EVF)– another type of view finder that is found on some point and shoot digital cameras is the EVF one. This overcomes the problem of your viewfinder and camera seeing slightly different things by giving you an exact picture of the scene you’re photographing in the viewfinder. This happens simply by putting a little LCD in the viewfinder.

Ultimately the choice in using the LCD or viewfinder will come down to personal preference. I have used a variety of digital cameras over the past few years and find myself using both methods depending upon the shooting situation and the camera. Some cameras have large and clear viewfinders (like my DSLR) and so I use them. Others have tiny viewfinders (in fact my latest point and shoot, the Fujifilm Finepix F10, doesn’t have one at all).

Given the choice between a great viewfinder and great LCD I’d probably opt for the viewfinder – call me a traditionalist but it just feels right for me.

Whether you"re shooting with a DSLR or a mirrorless camera, there are times when it"s easier to use the camera"s viewfinder rather than the LCD screen, and vice versa. For example, it"s usually easier to hold the camera steady when it"s held to your eye because it"s braced against your face. It"s also easier to follow a moving subject in a viewfinder than it is on a screen with the camera at arm"s length.

However, when you"re shooting landscape, still life, macro or architectural photography with the camera mounted on a tripod, the larger view provided by the LCD screen is extremely helpful. Similarly, when you want to shoot from above or below head height or at an angle, it"s very convenient to frame the image on a tilting or vari-angle screen instead of trying to use the viewfinder.

It"s also very helpful to use the LCD screen when you"re focusing manually because the Live View image can be zoomed in to 5x or 10x magnification. This provides a very detailed view of any part of the image, making critical focus adjustments much easier.

On the EOS 90D in Live View mode and on mirrorless cameras including the EOS R5, EOS R6, EOS R, EOS RP, EOS M6 Mark II and EOS M50 Mark II, you can also enable Manual Focus Peaking (MF Peaking), a visual aid to show which parts of the image are in sharpest focus. In theory, areas in focus will coincide with the greatest contrast, so the image is evaluated for contrast and these areas are highlighted on the display in a bright colour of your choice. You can see the highlighted areas of the scene change as you change the focus.

Bear in mind, however, that using your camera"s rear screen for extended periods will have an impact on battery life. Using Live View on a DSLR is also not recommended when you want to take fast bursts of shots, because it will usually reduce the continuous shooting speed. At the other extreme, if you"re shooting an exposure that lasts for multiple seconds or minutes, an optical viewfinder can cause a particular problem: stray light can enter the viewfinder and interfere with the exposure. To prevent this, use the eyepiece cover provided on your DSLR"s strap.

EOS cameras with an EVF have a proximity sensor that will automatically switch from the rear screen to the viewfinder when you raise the camera to your eye (although you can optionally disable this).

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.

"Samsung to Offer "Zero-PIXEL-DEFECT" Warranty for LCD Monitors". Forbes. December 30, 2004. Archived from the original on August 20, 2007. Retrieved September 3, 2007.

"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.

An enlightened user requests Dell to improve their LCD backlights, "Request to Dell for higher backlight PWM frequency" Archived December 13, 2012, at the Wayback Machine, Dell Support Community. Retrieved June 2012.

Oleg Artamonov (January 23, 2007). "Contemporary LCD Monitor Parameters: Objective and Subjective Analysis". X-bit labs. Archived from the original on May 16, 2008. Retrieved May 17, 2008.

The benefits of the viewfinder and LCD screen are often compared with one another. Depending on whom you ask, you might hear remarkably different opinions on the usability of the two.

As discussed above, photography is all about precision. Viewfinders have been around long before LCD screens, and therefore many photographers find viewfinders more comfortable to work with.

Viewfinders offer much more precision when you are shooting, especially on a bright day. It allows you to focus on the small details. Viewfinders reduce image distortion and capture an accurate image. That’s why most DSLRs and high-end mirrorless cameras today still have viewfinders.

Running out of battery is a nightmare for photographers, especially if you don’t have any spares. That’s why viewfinders are considered optimal in these situations. Viewfinders use comparatively much less battery than LCD screens.

Viewfinders are very convenient to use and provide smooth handling. When looking through the viewfinder, it’s easy to keep the camera steady. This makes the viewfinder an optimal choice when you need to zoom in or have a slightly heavier camera.

For many people, this extra effort of adjusting your eyeglasses is troublesome. However, some viewfinder cameras have a built-in diopter that can help make it easier to use with glasses.

Viewfinders can be much smaller compared to LCD screens. As a result, you may not be able to see everything you’re capturing in the viewfinder accurately. This drawback is very important for photographers who want to preview every single detail when taking a picture.

What sets LCD screens apart from viewfinders is their ability to provide 100% image coverage to the photographer. In comparison, cameras with a viewfinder offer around 90-95% of the image, sometimes less.

What you see through the viewfinder doesn’t always end up in the final result. Small details can be crucial. That’s why this 5-10% difference in image coverage can be a significant reason why you might choose an LCD screen over the viewfinder.

When you are in a lower field-of-view, framing can be much more difficult. Many people can’t take a picture while lying on the ground using a viewfinder. This is where LCD screens come in. Flexible LCDs make it easier for you to capture images when you can’t reach awkward angles.

LCD screens produce great results for night photography. LCD screens are often used for night photography due to their bright image playback quality. They help you focus on the small details when you are shooting at night.

An evident shortcoming of the LCD screen is its lack of utility on a bright day. Because of the glare, many people cannot use their LCD screen at all on a sunny day. It’s hard to see anything on the LCD except the reflections.

Another drawback to using an LCD screen is its difficulty in handling it. Holding the camera while looking through the LCD screen is difficult and takes a lot of effort, especially when you are zooming and trying to be precise.

Another disadvantage of LCD screens is the fact that they can easily overexpose your image. This should not be a problem for seasoned photographers who can improve the quality of the image with better handling and precision.

Those were some of the benefits and drawbacks of using a viewfinder and LCD screen to consider. So, which one is best? The answer depends on your personal preferences and budget.

If you’re a traditional photographer, you’ll probably be more comfortable with the viewfinder. If you are a photographer who likes to focus on small details and image quality, you should opt for the LCD screen.

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.

Whether you"re shooting with a DSLR or a mirrorless camera, there are times when it"s easier to use the camera"s viewfinder rather than the LCD screen, and vice versa. For example, it"s usually easier to hold the camera steady when it"s held to your eye because it"s braced against your face. It"s also easier to follow a moving subject in a viewfinder than it is on a screen with the camera at arm"s length.

However, when you"re shooting landscape, still life, macro or architectural photography with the camera mounted on a tripod, the larger view provided by the LCD screen is extremely helpful. Similarly, when you want to shoot from above or below head height or at an angle, it"s very convenient to frame the image on a tilting or vari-angle screen instead of trying to use the viewfinder.

It"s also very helpful to use the LCD screen when you"re focusing manually because the Live View image can be zoomed in to 5x or 10x magnification. This provides a very detailed view of any part of the image, making critical focus adjustments much easier.

On the EOS 90D in Live View mode and on mirrorless cameras including the EOS R5, EOS R6, EOS R, EOS RP, EOS M6 Mark II and EOS M50 Mark II, you can also enable Manual Focus Peaking (MF Peaking), a visual aid to show which parts of the image are in sharpest focus. In theory, areas in focus will coincide with the greatest contrast, so the image is evaluated for contrast and these areas are highlighted on the display in a bright colour of your choice. You can see the highlighted areas of the scene change as you change the focus.

Bear in mind, however, that using your camera"s rear screen for extended periods will have an impact on battery life. Using Live View on a DSLR is also not recommended when you want to take fast bursts of shots, because it will usually reduce the continuous shooting speed. At the other extreme, if you"re shooting an exposure that lasts for multiple seconds or minutes, an optical viewfinder can cause a particular problem: stray light can enter the viewfinder and interfere with the exposure. To prevent this, use the eyepiece cover provided on your DSLR"s strap.

EOS cameras with an EVF have a proximity sensor that will automatically switch from the rear screen to the viewfinder when you raise the camera to your eye (although you can optionally disable this).

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