purpose of lcd panel on a camera brands

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, or Liquid Crystal Display is a type of thin, flat display screen; these began to appear in some film cameras to display settings in the 1980s. They are now ubiquitous in digital cameras, to display images, menus and settings. On many digital cameras that have them, LCD displays may be the only form of viewfinder provided. Early digital SLRs were only able to review captured images on their rear LCD panels, but used a reflex finder for composing images. As of 2011, "live view" LCD displays are increasingly used on more advanced digital cameras and (as in the case of EVFs) may eventually displace optical viewfinders entirely.

LCDs may be made as full color pixel-oriented arrays, capable of showing full photo images as described above, or as fixed-format modules, only able to display only pre-defined monochrome symbols or numerals. It is the second type which can be found on early low-resolution consumer digicams, or as frame counter and function control displays on film cameras which use electronic controls.

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.

When I used a film SLR I used to take meticulous notes of the settings that I used when taking photos – noting frame number, aperture and shutter speed down after most shots so that a week or two later when I got my photos back from the lab I could compare my notes with the shots and work out how I might improve my 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).

When it comes to composing your shots, photographers now have a couple of options: a viewfinder (optical/electronic/hybrid) or a rear LCD screen (most cameras feature both) – using your camera"s LCD opens up possibilities, so that"s what we"re going to discuss today.

For example, I’m sure you’ve encountered those who insist on using a camera with a viewfinder and grouse at the very thought of having to use an LCD to compose. There’s certainly nothing wrong with sticking to a tried and true approach, but it also doesn’t hurt to try something new.

This point is of particular interest to street photographers who value the ability to blend in with the crowd. I know some of you are nauseated by the idea of holding your camera at arms length and looking like a tourist, but this can work in your favor!

The general public traffics in certain misconceptions about photographers and their cameras, with a common fallacy being that “professionals” use “big” cameras — you know, the ones where you have to look through the viewfinder.

When shooting portraits or cityscapes, I prefer the tunnel vision that the viewfinder provides. But one of the advantages of shooting street photography with an LCD screen is that you can compose your shot while still being able to see what’s going on around you.

Not having to raise your camera to your eye in order to capture a shot can be liberating. That feeling of liberation tends to incite fits of creativity — creativity that can be easily applied to composition.

You’d be hard pressed to find a current-market digital camera without an articulating LCD (to be sure, there are a few exceptions), thus allowing you to alter your perspective with a flip of the screen.

I’ve written before on the visual and optical characteristics that one should be aware of when looking to create successful black and white images, such as contrasty scenes, textures, well-defined shapes and moody light/shadows.

It’s a good thing to know how to spot monochrome-worthy scenes with your own two eyes, but your camera’s LCD can definitely make it a more convenient process.

I am not suggesting that using an LCD is objectively better than using an optical or electronic viewfinder, but there are indeed situations where an LCD has distinct advantages over a viewfinder, some of which are stated above (a few of these advantages may be mitigated especially by an electronic viewfinder versus an optical viewfinder).

Perhaps the best trick accomplished by an LCD is putting the user in a more relaxed frame of mind; when you’re unencumbered by the perceived gravity of your work and the tools used to carry out that work, you can simply enjoy the process of shooting.

To make sense of all these LCD-viewing ideas and put them into practice, be sure to have a look at this professional guide on Advanced Composition – it really is a fantastic guide that could propel your photography skills beyond the limits you thought possible!

Shooting with the rear LCD screen on your camera may be convenient, but you"re also peering through a filter of colors and shades that you may not have been aware are altering the way you perceive your shots.

There are several reasons why you might want to take photographs using the rear LCD screen on your digital camera. It could be to overlay information such as a spirit level, camera settings, or to utilize the rule of thirds grid in order to achieve better composition. Perhaps you wear glasses or have an issue with vision in which using the viewfinder may detrimentally impact your ability to compose or shoot. It might even be that you"re shooting with your camera at awkward angles, maybe holding the camera down low to the ground to capture a macro shot of a flower or perhaps overhead at a crowded concert, where a tilting or vari-angle screen can be articulated to help with composition.

Camera brands use different LCD screens, so you and a friend could be taking a picture of the same scene and end up with wildly different-looking results when doing an image review together. Even models within specific manufacturers use different screens, so the reliability and uniformity of each screen for things such as color can be over-emphasized.

With the advent of mirrorless cameras and the introduction of the electronic viewfinder (EVF), we now have digital cameras where we literally can"t avoid shooting and reviewing photographs through a screen. The benefits of using an EVF over the rear screen is that the screen is sheltered from reflections and extraneous light, which can affect the perception of photos when using the rear screen. However, these tiny little screens inside a small box in the camera still don"t produce an ideal picture of your photographs.

Whatever the reason, it"s important not to rely on the scene on your rear screen. An assumption that what you see is what you"ve taken is tempting but a little foolish. That"s because the screen has a limit to the light and shade it can display. It also has a color balance, which can affect the white balance or color profile you attribute to shots. This unintentional filtration can have a negative effect on how you capture images. Some cameras have the option to turn the brightness of their screen up and down, which also affects how images on the rear screen are seen (whether using live view or to display photos already taken) as well as altering color balance of the rear screen manually. One way to mitigate this is to turn on the histogram and use that.

Notwithstanding these options and difficulties in the limitation of the screen technology, where you view your photos also has a big impact on what you see. Looking at a screen at night, for example, you might need to turn the brightness down to avoid blinding yourself. The vivid lower frequency colors of sunset or sunrise light may be cascading warm tones across and around the screen, forcing you to perceive the color temperature in the photograph differently. If you don"t believe me, have a look at color theory illusions online, and you"ll see just how easy it is for the eye to be tricked into perceiving things as the same, even though they"re different, or seeing the same colors or shades in a scene when in fact they"re completely different (remember the dress from 2015?).

That"s why I suggest you can maintain a healthy balance between relying on your rear screen for certain aspects of shooting such as composition, leveling, framing a scene, and getting a rough visual idea of how the photograph is coming together. But I would advise against relying on the screen to discern color, brightness of highlights and shadows, and other such optical aspects. For this, I would recommend the use of the histogram in camera, especially when needing to check if highlights or shadows have been over/underexposed and have become clipped. Your camera may also have a dedicated function to alert you to this. This and combining the approach with color swatches and gray cards can be a very good way to attain accurate color and exposure values in photographs.

It"s good practice to take stills in raw format, where the color and exposure is much more flexibly editing in post-production image editing software and study images on a decent monitor screen that can display a wide color gamut with deep shadows and bright highlights to get the most accurate view of what your photographs actually look like.

Try to view them in a low-light room with minimal reflections. You might want to consider using a screen hood to remove unwanted reflections further from obscuring your view (think of viewing shots on the rear screen outside during the midday sun and how difficult it is to see what"s going on without putting your hand round to screen to shade it from the bright light). So, although the rear screen is incredibly useful, it"s important not to rely on the rear screen for color rendition and exposure accuracy and instead look for more reliable methods for balancing your digital photos.

If you"ve had a shoot ruined by the color or brightness bias of your rear screen or perhaps think that the rear screen is the better way to compose shots over the optical viewfinder or relying on a good photographic computer monitor, then I"d love to hear your thoughts in the comments below.

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).

I’m still out of breath between my deviated septum and what I had to just do. COVID 19 is mutating, and we as a society are trying to keep up. Here in America, it’s strongly recommended that you wear two masks. If you’re taking things even further, you’re probably using eye protection. Your glasses aren’t enough, and if you’re like me and need your glasses for everything, it’s going to get tougher. But all of this has reaffirmed something massive in my head: the LCD screen of a camera is about to become incredibly vital Manufacturers can’t just ignore it anymore. They need to put the highest resolution screens into their cameras right now. More importantly, they also need to make their interfaces better—the keyword here being NEED.

Imagine this: put a layered cloth mask on. Ideally, it will have at least two layers of cloth, with one being very thick. For extra credit, have one with a carbon filter. Then put an N95 mask on over that. And more importantly, please wear it correctly: make sure it’s nice and tight. Your nose shouldn’t hang out, and it shouldn’t look like a chin diaper. Switch them around as needed and if needed.

Now grab your camera, go outside, maintain proper social distance, and try to take a photo. Specifically, try to use the viewfinder. You’ll see that it’s challenging to do. Your best bet is to instead just the camera’s LCD screen. This isn’t so much of a problem, I guess. But the problem here is the resolution. Lots of camera manufacturers have skimped on LCD screens in the past years. In fact, many just recycle the same screens they’ve used for at least four years, but now we have to change this. The Leica TL2 and Fujifilm XT200 are probably the best choices here.

A camera’s LCD screen needs to become bigger, higher resolution, brighter, etc. What’s more, the interface needs to be easier. Lots of cameras don’t have full touchscreens. Why? It’s 2020, and they’re long overdue. This is just one of the reasons why so many folks love to use their phones instead. The interface is simple, big, visible, and it’s not too cluttered. But it can give you everything you need. Cameras have this, except for the bigger screens. Very few really have big screens that allow you to do everything you need.

Soon, I’m going to be carefully considering this with every camera we review. The screens need to be much better. I sincerely think it’s possible. The way photographers, YouTubers, journalists, bloggers, and hobbyists are all using cameras has changed. The pandemic is showing us that there are ways cameras can be multi-functional. And quite honestly, it’s well overdue. I’m a bit shocked that it took a pandemic to make this happen. But at the same time, I’m not surprised. Pressure makes diamonds is how the old saying goes.

Not to be confused with an LCD Monitor, an LCD panel in Canon EOS terms is the small visual display on top of the camera, that gives you an at-a-glance peak at all the main camera settings.

An electronically generated text, numeric & symbols. Before the popularity of the LCD, LED is the most common method. LCD consume only one fifth (1/5) of the power of the LED and thus have a wider application in photographic line.

lens-One or more pieces of optical glass or similar material designed to collect and focus rays of light to form a sharp image on the film, paper, or projection screen.

Finding a touchscreen ~ and EVF viewfinder in the same camera at this price point is like Christmas for photographers. The Sony a6300, a comparable Sony mirrorless camera, offers the EVF viewfinder and an ~, but it is not a touchscreen.

The G9 has an ~ on the top of the camera body for quick reference while shooting. I found this to be a thoughtful addition that is commonplace on DSLRs but absent from many mirrorless cameras. Similarly, its OLED viewfinder offers 0.83x magnification, 3.

The focal point of the lenses fall on the underlying ~ and the lenses refract the screen"s light so you see the left and right stripes of pixels or subpixels with different eyes.

It should last around four years and when it"s time to change it the word "CLOCK" will appear on the top ~ and functions such as the interval timer that depend on the clock will stop working.

He further points out that using the ~ effectively means that a light meter can be left at home and if the shot isn"t right, it can be tried again. Therefore, the idea that only "wannabe" photographers need to look at the LCD and check the exposure, image, or both may be unreasonable.

Durability, a pre-eminent feature of the D800 series, is of course not limited to the ~. The D810 is no slacker in this department, with its magnesium alloy body and weather/dust-resistant sealing, plus a shutter tested to 200,000 cycles.

The Nikon SB-700 Speedlight features a multi-step power zoom that covers a 24-120mm wide angle of view with FX-format cameras, three light distribution patterns (standard, center-weighted and even), a large dot-matrix ~ for easy operation, Thermal Cut-Out detection, advanced wireless TTL operation, ...

Since you can"t zoom in using the viewfinder, relying on the ~ on the back of your camera to get as close as possible to the target subject will help you zero in the focus with much better accuracy.

This design is an inefficient use of the available real estate and Sony would have been better off using this space for a dedicated Drive Mode Dial (like on the A9) or moving the Mode Dial to the left to free up room for a top ~ on the right hand side (like on the Nikon Z6).

Index print: Created by digital scanning, a print-sized sheet of tiny positive images of every shot on a roll. Used for storage, indexing, and reprinting reference.

� When you use a camera phone, you have to hold it far enough from your head that you can see the image on the ~. Try holding the phone with both hands. When you"re ready to take the picture, press the shutter release gently, don"t punch it.

A new feature that some digital cameras have to magnify the preview image on the ~. This is useful for checking image quality, which is difficult to check on a normal unmagnified LCD view.

1. Take your camera and lens and speedlight. Hopefully it is a speedlight which gives you the distance scale on ~, such as the SB-800 and SB-900 and 580 EX (I and II). If you have an SB-600 or 430 EX, then I have good news for you . you"re going shopping! ...

We get a lot more in-depth with our full review here, but here"s the gist: The only complaint you might have is that it"s a bit "too much"; many serious hobbyists may just not need the info ~, and the control ring in the aperture position is a little too easy to bump accidentally; ...

This allows for Touch and Drag AF so users can easily switch the subject of their focus by dragging the AF frame directly on the ~, even while looking through the camera"s EVF. Focus peaking allows users to highlight the area of the image that is in focus from within the EVF or LCD monitor.

It might be helpful to add that even though sub-pixel antialiasing is the default text rendering method on Macs with built-in ~s, using a third-party external screen can result in all text being rendered using greyscale antialiasing.

I take a shot and check out my composition and exposure on my camera"s ~. When I"m pleased with the result, all I have to do is position the subject in the scene, point and shoot. That technique lets me work quickly with a stranger so that I don"t overstay my welcome.

All three cameras work with the Sony MCX-500 live producer, a compact switcher designed so one person can run a multi-camera live event. With the switcher and RM-30BP controller, a Tally icon appears on each camera"s ~ and viewfinder.

You must set your GPS unit so the transfer is NMEA (4800bps) and the units are hddd mm ss.s. You do anything else and it will not work! With this all accomplished, a small D appears above the shutter speed on the Top ~.

a flat solid surface in an area of good light, and then all you have to do is place some interesting items onto the surface. When you are ready to make a photo simply hold your camera out at arms length with the lens pointing straight down and capture the image. Remember, if your camera has an articulating ~ ...

On most digital cameras that have them, LCD displays are (or can be) used as the viewfinder, and many do not have any alternative way of composing shots. However, it seems that the majority digital SLRs can only view results on their ~s, and frames must be composed using the TTL reflex viewfinder.

LCDs don"t emit their own light; rather, they are back-illuminated by a strip of LEDs whose light intensity is quite powerful so as to compensate for the brightness drop due to the low transmission rate of the ~ (caused mainly by the RGB color filter).

With some digital cameras this means that the ~ cannot be used for previewing. This kind of camera offers professional quality, but at a price far above that of simpler models. There are many attachments that increase the versatility of the digital camera.

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This website is using a security service to protect itself from online attacks. The action you just performed triggered the security solution. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data.

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.

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

In 1888,Friedrich Reinitzer (1858–1927) discovered the liquid crystalline nature of cholesterol extracted from carrots (that is, two melting points and generation of colors) and published his findings at a meeting of the Vienna Chemical Society on May 3, 1888 (F. Reinitzer: Beiträge zur Kenntniss des Cholesterins, Monatshefte für Chemie (Wien) 9, 421–441 (1888)).Otto Lehmann published his work "Flüssige Kristalle" (Liquid Crystals). In 1911, Charles Mauguin first experimented with liquid crystals confined between plates in thin layers.

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

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.

Mini-LED: Backlighting with Mini-LEDs can support over a thousand of Full-area Local Area Dimming (FLAD) zones. This allows deeper blacks and higher contrast ratio.

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.

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

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

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

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

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

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

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

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

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

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

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

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 i