contrast ratio for lcd monitors supplier

If you’re in the market for a new TV, projector, camera, or any other type of display, you should pay attention to the contrast ratio. But what does this measurement mean, and how do you know whether your display has good contrast?

While most displays have a contrast setting that the viewer can manually adjust, the ratio refers to the panel’s limitations—in other words, the largest possible difference between its lightest (white) and darkest (black) areas.

Contrast ratio is the measurement of the difference between a display"s maximum and minimum brightness; put another way, it"s the ratio between the brightest white and the darkest black. For example, a contrast ratio of 1,000:1 means that the brightest white image is 1,000 times brighter than the darkest black.

Generally, a higher contrast ratio is better since a display with a 100,000:1 ratio can produce darker black levels and more saturated colors than one with a 1,000:1 rating, thus achieving a more natural-looking image. That said, a bigger number isn"t always better, as you need to take external lighting conditions into account the lighting conditions and the type of display into account.

As previously mentioned, a higher contrast ratio has its benefits but isn’t the only thing you should consider. For example, a projector with a lower contrast ratio could provide an optimal viewing experience if you’ll be using it in a room with a lot of ambient light.

Contrast ratios can also vary significantly across different display types. While a transmissive digital projector may only have a contrast ratio of 200:1, many newer TVs are over 4,000:1. But even these figures don’t tell the whole story, as contrast ratios are dependent on the underlying technology and how they are measured.

When looking at a display’s contrast ratio, it’s important to understand the various ways in which they are measured. The actual ratio you see can be broken down into two different types: Static Contrast and Dynamic Contrast.

Static Contrast, otherwise known as “native” or “onscreen,” is a ratio comparing the brightest and darkest shade a display system is capable of producing at the same time. Since this ratio reflects the results from when the panel was made, industry experts typically consider this a more accurate representation of a display’s capabilities.

Dynamic Contrast offers a more theoretical range of a display’s contrast ratio, as it’s heavily dependent upon the screen’s underlying technology. Here, the range between the lightest areas of an all-white/light scene and the darkest areas of a black/dark scene is measured.

The problem with dynamic contrast measurements is that they are typically dishonest, as you’re unlikely to experience such a wide contrast range in the same scene. On top of this, manufacturers can manipulate contrast to make a scene lighter or darker using a display’s backlighting and firmware.

Unfortunately, there is no standardized measurement of contrast ratio. Particularly in the TV market, manufacturers can essentially inflate their ratings due to a combination of measurement and unstated variables. That said, most contrast ratios are measured using one of two methods:

Displays that measure with this method tend to register lower contrast ratios as ANSI contrast provides a more realistic measurement of the screen’s capability. However, since the test can include a room’s lighting conditions in its measurement, it needs to be performed in an ideal environment for the most accurate reading.

This method measures an all-white screen with an all-black screen and reflects equal proportions of light from the display to the room and back. It"s the preferred method for many manufacturers, as it cancels out exterior lighting conditions and results in an ideal (and thus higher) contrast ratio. Unfortunately, dynamic contrast specs are often misleading since they can be inflated and don"t indicate much about how an average image"s contrast will look.

The eye test is the best tool at your disposal — if a display’s black levels look washed out and gray, its contrast ratio probably isn’t high enough. However, there are other ways to ensure you’re not being misled:

Look for vendors that publish ANSI contrast specs, as this is a more accurate reflection of the display’s true contrast range. Unfortunately, many companies don’t disclose these figures, as ANSI readings tend to be much lower than Full On/Off, and it’s simply a better marketing strategy for these companies to focus on the latter.

Pay attention to backlighting technology.If you’re looking for a TV with a high contrast ratio, an OLED display will offer a better viewing experience than an LCD panel, as the OLED’s pixels don’t rely on a backlight and can display deeper blacks without a “blooming” effect.

Stick to the same manufacturer when making comparisons.Since every company arrives at its contrast ratios through different means, comparing displays produced by the same manufacturer is an excellent way to get consistent figures.

As it pertains to monitors, the contrast ratio is the ratio between the brightest white’s highest lumination level and the deepest black color the monitor is capable of producing. If a monitor has a high contrast ratio, it means it offers deeper shades of black, indicating a higher level of picture quality overall.

Contrast ratio is crucial for projector image quality. The higher the contrast ratio, the more detail viewers can see on the image projected. A higher contrast ratio also means more color subtlety is available, and more shading is visible.

Modern computer LCD monitors typically have a contrast ratio of between 1000:1 and 3000:1. A good gaming monitor may range toward the higher end of the spectrum, but use your eyes when considering a monitor you"re comfortable with and note that ambient light will affect what you"re seeing.

When shopping for a computer monitor, you"re bombarded with specifications like native resolution and response time, but one of the more misunderstood monitor features is contrast ratio. As with many things, bigger is generally better when it comes to contrast ratio, although it is only one factor to consider when purchasing a monitor -- and manufacturers sometimes use confusing terms like "dynamic contrast ratio" to make things more confusing. Still, if having a huge contrast range is tops on your priority list, there are some numbers to look for.

What Contrast Ratio Means Simply put, the contrast ratio of a monitor is the the measured difference between the darkest blacks and the brightest whites a display is capable of producing. This is expressed in ratio form, such as "4000:1" and is read as "four thousand to one." The larger the first number, the higher the contrast ratio of the monitor and the more difference there is between pure black and pure white.

Why Contrast Ratio Is Important With a wider range between black and white, a monitor is capable of deeper, richer colors with more visible details in shadows and highlights. This is particularly important if the monitor is being used for photo or video editing, graphic design, watching movies or even playing video games. Essentially, any application where being able to detect small differences in color and brightness will benefit from a higher contrast ratio.

Manufacturer Claims and Measurement Irregularities Unfortunately, there is no industry standard for measuring contrast ratio, so it"s entirely possible for two different monitors to have identical published specifications while actually appearing rather different from each other. Still, while the measurements cannot be considered scientific or consistent from monitor to monitor, they provide a basic baseline for comparison while visually inspecting the picture on two different displays.

Highest Available With the advent of local-dimming LED backlit monitors, manufacturers list both the dynamic contrast ratio as well as the static contrast ratio. LED monitors can actually shut off the backlight in the portions of the monitor that have a pure black area, leading to contrast ratio measurements that can top 50,000,000:1. The static contrast ratio, which is a more realistic measurement of monitor contrast performance, is the measurement of the difference between blacks and whites with the backlight at its lowest possible setting while remaining powered on. Higher-end monitors can have a static contrast ratio up to 3000:1, giving a large dynamic range.

As a first step, try using the calibration settings we recommend (provided we have reviewed your monitor). This will get good, basic contrast - meaning no additional contrast-enhancing settings - and with no loss of detail in dark portions of the image. You can find this information in the "Post Calibration" section of the review.

Contrast:Adjusting this will let you affect how much contrast the monitor has. We list a recommended setting with all of our reviews, but it"s almost always fine to just set this to the maximum. On rare occasions, gamma might be affected, leading to a loss of detail in highlights.

Local Dimming: The local dimming feature dims the backlight behind darker portions of the screen. It can deepen contrast, and it"s worth using when implemented well. It can introduce issues like light blooming off of light objects within dark areas, and when done especially poorly, can dim the entire image. We discuss local dimming in more detail here.

Backlight settings have a very minor impact on contrast, and so you should set it to whatever looks best in your viewing space. With LED Monitors, both white and black will become about equally brighter or dimmer when the backlight is adjusted, preserving the ratio of light to dark. With OLED monitors, adjusting the OLED light only increases the peak brightness; blacks are still perfectly black.

One frequently asked question is which is more important, a panel"s native contrast or contrast with local dimming? It"s a good question. The answer is a bit complicated, but basically, it depends. Unlike TVs, most monitors don"t have a local dimming feature. The few that do, generally speaking, don"t work very well. They usually have very small zone counts, and the algorithms can"t keep up with fast-paced motion, so the leading edge of a bright object in a dark scene ends up looking darker than the rest, and there"s a trail of light behind it.

Because of these issues with local dimming, it"s almost always more important to look at the native capabilities of a monitor instead of the contrast ratio with local dimming. Because most monitors have poor local dimming features, there"s usually not that much of a difference between the native contrast of the panel and the contrast with local dimming when tested with a checkerboard pattern. In fact, of the 23 monitors with local dimming that we"ve tested on our latest test bench, only 4 of them can improve contrast by 10% or more with our test pattern through local dimming.

There are different ways to measure contrast. We measure contrast with a checkerboard pattern and take the average black level from four squares, but some other review sites measure it differently, which can lead to a difference in posted numbers. Some of the other methods we"ve seen websites use include:

Full On/Off: Some websites measure the contrast using a full white screen, and a full black screen. This is generally considered a less accurate way to measure contrast, and it isn"t very realistic. Contrast measurements with local dimming tend to appear much better with this measurement technique, as it"s easy for any monitor with local dimming to turn the entire screen off at once.

Small Samples: Similar to the full-screen method, but instead of large slides, contrast is measured using small slides that only cover part of the screen. This method isn"t ideal either, as imperfect uniformity can significantly skew the results.

ANSI Checkerboard: The most generally accepted way to measure contrast; a checkerboard pattern very similar to ours is used, but with an asymmetric test pattern. The ANSI method measures the output in all 16 squares and averages the values for the white and black squares. It usually produces very similar results to our own.

Because of differences in measurement techniques, equipment used, and even differences between units, it"s extremely common for different websites to report different contrast measurements.

Monitors use different display technologies, each with advantages and disadvantages. Knowing which type of panel is used in your monitor can already give you a good indication of what to expect in terms of contrast ratio:

OLED: Very few OLED monitors exist, but they essentially have perfect contrast, as each pixel is self-emissive, the black level of black pixels is essentially zero.

Even within the same panel types, it"s normal for the contrast to vary a bit between units, even of the same model, due to manufacturing tolerances. Manufacturers used to provide the typical contrast ratio for each monitor, but recently, some brands, including LG, have started listing the minimum contrast ratio you could get. For IPS and TN panels, this difference usually isn"t very significant, and most people shouldn"t worry about it, but for VA panels, the variance between individual units and measurement techniques can be significant. For example, the LG 32GN600-B is advertised to have a typical contrast ratio of 3000:1, but according to LG, it could be as low as 1800:1 for some units. We measured a contrast ratio of 3248:1, almost double the minimum contrast for that model.

A monitor’s contrast ratio indicates the depth of blacks – a higher contrast ratio means deeper blacks – and, by extension, better picture quality. It’s a very important part of picture quality, so if you want something that looks good (particularly in a dark room), be sure to get a monitor that has good contrast.

There are a few things that can be done to improve contrast, but there are limits. As a good first step, look to our recommended picture settings (listed with every review), as those can help you get a good baseline. From there, you can enable or disable a few different settings that might help deepen blacks. Just remember that some of those settings will have other consequences on picture quality.

If the games you play and movies you watch on your best computer display, HDR monitor, or HDTV seem a bit washed-out or not as detailed as they should despite high resolutions and high-end settings, you might want to look into adjusting your contrast ratio.

Contrast ratio (which we’ll refer to here sometimes as “CR” is defined by the range between the luminance (brightness) of the brightest white and the darkest black that any given monitor or tv can display. More technically speaking, luminance is a number used to measure the intensity of light present on any given surface, as expressed in candelas per square meter (ced/m²)- more commonly referred to as “nits.” The contrast ratio of a display is determined by measuring the luminance of white and black and then calculating the ratio between the two extremes. If you’re conscious about your eye health, check out our guide on the best monitor settings for eyes.

It’s particularly noticeable in dark scenes in a game or video, where shades of black will be a prominent part of the image, but it makes a huge overall difference in image quality and sense of detail and depth regardless of the image, and it’s a concept a lot of people aren’t aware of. Luckily, Windows, macOS, and most modern displays all offer plenty of calibration options to ensure that you’re getting the best contrast ratio possible for your system, like the quality contrast you can see on an HDR computer monitor.

Contrast ratio is generally expressed in product descriptions of most HDTVs computer displays using the default value of 1000:1- that is, a range of approximately 999 nits between the blackest black and most luminous white a display can generate at default settings. Here, default settings would be defined as brightness= 50, contrast= 50, and gamma (if offered) = 50- both in the native display window, with high contrast mode set to off if using Windows 10.

In terms of CR numbers, the higher, the better, so it’s good to look for numbers of anywhere from a fairly standard 1000:1 to an exceptional 3000:1. There is, however, a caveat here- if a product is described as having a contrast ratio higherthan 3000:1, it’s most likely purely a marketing gimmick, and not really a noticeable or effective ratio.

As ever, though, you should trust your own eyes before anything else. If you happen to be shopping for a new television or display in-store, take the time to check the contrast ratio between products, and test settings while you’re at it. Due diligence in this regard will pay off.

Lastly, a factor many don’t consider when purchasing a new display is ambient light– or the light in a room or space falling directly on the display. This will have a real impact on your perception of contrast and is something you should consider when hunting for a new monitor or HDTV. If you want to learn about more monitor setting guides, check out how to fix input lag on a monitor.

Nothing beats the vertical alignment panels and super vertical alignment panels in contrast ratios regarding the display technology and probably the panel types.

The vertical alignment panels have liquid crystals aligned naturally to the glass, ensuring a more comprehensive contrast ratio range. These panels also have minimum light leakage; meaning prevents the backlights from reaching the deepest blacks. Its whites have better clarity and are uniform.

The display brightness determines the contest ratio integrity in the real action. It counters the surrounding lights" effect on the display. Calibrate the backlight luminance settings to match the display contrast calibration.

To enjoy the best contrast ratio experience, consider a monitor with high brightness levels of up to 5,000 nits. The high luminance counters the effect of ambient lighting.

Glare and reflection of light to the screen affect contrast ratio. When ambient light hits the screen surface, it reflects into your eyes, disrupting your vision. A monitor with an anti-glare coating addresses the glare and reflection issues effectively. Also, ensure your room has minimum ambient and natural light striking the screen directly.

Ambient light from the surroundings directed towards the monitor affects the contrast ratio. This light strikes the screen, scattering in all directions. The reflected light then strikes the eyes of the monitor used. This condition results in unclear image display due to lowered contrast quality.

tossed around for computer displays. If you didn"t know before, contrast ratio is simply the difference between the darkest blacks and the brightest whites a given display can produce.

Typically, computer displays have a contrast ratio of about 1000:1. However with DCR, you"ll see numbers like 4000:1, 10,000:1, and higher. Basically, it"s just a way for Company A to proclaim, "Don"t buy Company B"s monitor because it has a much lower DCR than our monitor." Since more and more vendors have been pushing this, I want to delve further into how they"re getting these numbers. I also covered this topic in less detail (but with a sexy voice thrown in) in podcast.

Before a monitor is released to the public it goes through a bunch of testing in the vendor"s own lab. These tests produce the specs that the vendor will then publish with the release. Specs like maximum brightness, pixel pitch, pixel response time, contrast ratio, and dynamic contrast ratio are all determined in the vendor"s own lab.

When testing normal contrast ratio, vendors use a device that measures light to determine how much light is emanating from a display while it"s showing both a completely black and a completely white screen. They then take each number, do a bit of math, and come up with the contrast ratio.

Now, aside from a relatively low number of LCDs that use newer LED backlighting technology, all LCDs have a lamp built in to their screens. When you turn your brightness setting down, you"re actually just dimming the lamp in the back. When the vendors dim the backlight to get the contrast ratio score, they dim it to a point, but do not turn it off. When they test to get the readings for DCR, however, they turn on the DCR feature and put up a black screen. When the video signal is black or near black, this triggers the backlight to go into standby mode.

Once this is triggered, the darkness of the black level increases by a factor of 10 or more. At this point the vendor takes its reading for the dark screen and compares it with the white screen reading it got before. Since this new dark screen level is so dark, it increases the contrast ratio. The problem is that the screen only gets this dark when the video signal is black or near black--not very useful when you"re watching a movie, or playing a game, or doing pretty much anything. The primary reason for including this feature is that the contrast ratio goes from 1000:1 to 10,000:1, and even 20,000:1 for computer displays and even higher for televisions.

When vendors push DCR as a spec for LCDs that use LED backlighting technology, however, it may be more appropriate. Direct contrast ratio works differently here than with lamp-based LCDs. When a portion of an image in a movie is relatively dark, the LEDs in that local area of the screen are dimmed. This occurs on a frame-by-frame basis and lowers the black level in that dark area only. Unfortunately, this implementation has its weaknesses, as well, as there can be some noticeable visual glitches in the areas that darken.

So, after the testing is done, the vendor publishes its super-high number, and Joe Consumer (not you, of course, loyal reader, but someone else) goes into the local Best Buy, looking to get a new monitor for his 5-year-old Compaq desktop that was handed down to him by his younger, more tech-savvy brother. He looks at the specs and sees that monitor A has a 10,000:1 DCR, while monitor B has a contrast ratio of 1000:1. Well, bigger numbers mean better, right? So, he goes for the display with DCR. And that"s fine if A does everything else you want it to do.

If a display looks good with the type of content you plan to use on it, has the connections you want, is the right size and price, then by all means get it. Don"t get it, however, just because of some spec that means jack when you"re actually using the display (or has not been implemented well enough for the glitches not to distract, as is the case with LED-based DCR).

Unlike CRT monitors, LCD monitors display information well at only the resolution they are designed for, which is known as the native resolution. Digital displays address each individual pixel using a fixed matrix of horizontal and vertical dots. If you change the resolution settings, the LCD scales the image and the quality suffers. Native resolutions are typically:

When you look at an LCD monitor from an angle, the image can look dimmer or even disappear. Colors can also be misrepresented. To compensate for this problem, LCD monitor makers have designed wider viewing angles. (Do not confuse this with a widescreen display, which means the display is physically wider.) Manufacturers give a measure of viewing angle in degrees (a greater number of degrees is better). In general, look for between 120 and 170 degrees. Because manufacturers measure viewing angles differently, the best way to evaluate it is to test the display yourself. Check the angle from the top and bottom as well as the sides, bearing in mind how you will typically use the display.

This is a measurement of the amount of light the LCD monitor produces. It is given in nits or one candelas per square meter (cd/m2). One nit is equal to one cd/m2. Typical brightness ratings range from 250 to 350 cd/m2 for monitors that perform general-purpose tasks. For displaying movies, a brighter luminance rating such as 500 cd/m2 is desirable.

The contrast ratio rates the degree of difference of an LCD monitor"s ability to produce bright whites and the dark blacks. The figure is usually expressed as a ratio, for example, 500:1. Typically, contrast ratios range from 450:1 to 600:1, and they can be rated as high as 1000:1. Ratios more than 600:1, however, provide little improvement over lower ratios.

Unlike CRT monitors, LCD monitors have much more flexibility for positioning the screen the way you want it. LCD monitors can swivel, tilt up and down, and even rotate from landscape (with the horizontal plane longer than the vertical plane) to portrait mode (with the vertical plane longer than the horizontal plane). In addition, because they are lightweight and thin, most LCD monitors have built-in brackets for wall or arm mounting.

Besides the basic features, some LCD monitors have other conveniences such as integrated speakers, built-in Universal Serial Bus (USB) ports and anti-theft locks.

Contrast ratio - The difference in light intensity between white and black on an LCD display is called contrast ratio. The higher the contrast ratio, the easier it is to see details.

Ghosting - An effect of slower response times that cause blurring of images on an LCD monitor, it"s also known as latency. The effect is caused by voltage temporarily leaking from energized elements to neighboring, non-energized elements on the display.

Luminance - Also known as brightness, it is the level of light emitted by an LCD display. Luminance is measured in nits or candelas per square meter (cd/m2). One nit is equal to one cd/m2.

Stuck pixels - A pixel that is stuck either "on" or "off", meaning that it is always illuminated, unlit, or stuck on one color regardless of the image the LCD monitor displays can also be called a dead pixel.

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The contrast ratio (CR) is a property of a display system, defined as the ratio of the luminance of the brightest shade (white) to that of the darkest shade (black) that the system is capable of producing. A high contrast ratio is a desired aspect of any display. It has similarities with dynamic range.

There is no official, standardized way to measure contrast ratio for a system or its parts, nor is there a standard for defining "Contrast Ratio" that is accepted by any standards organization so ratings provided by different manufacturers of display devices are not necessarily comparable to each other due to differences in method of measurement, operation, and unstated variables.projection screen or emitted by a cathode ray tube, and the only light seen in the room would come from the display device. With such a room, the contrast ratio of the image would be the same as the contrast ratio of the device. Real rooms reflect some of the light back to the displayed image, lowering the contrast ratio seen in the image.

Static contrast ratio is the luminosity ratio comparing the brightest and darkest shade the system is capable of producing simultaneously at any instant of time, while dynamic contrast ratio is the luminosity ratio comparing the brightest and darkest shade the system is capable of producing over time (while the picture is moving). Moving from a system that displays a static motionless image to a system that displays a dynamic, changing picture slightly complicates the definition of the contrast ratio, due to the need to take into account the extra temporal dimension to the measuring process.

Many display devices favor the use of the full on/full off method of measurement, as it cancels out the effect of the room and results in an ideal ratio. Equal proportions of light reflect from the display to the room and back in both "black" and "white" measurements, as long as the room stays the same. This will inflate the light levels of both measurements proportionally, leaving the black to white luminance ratio unaffected.

Some manufacturers have gone as far as using different device parameters for the three tests, even further inflating the calculated contrast ratio. With DLP projectors, one method to do this is to enable the clear sector of the color filter wheel for the "on" part and disable it for the "off" part

Another measure is the ANSI contrast, in which the measurement is done with a checker board patterned test image where the black and white luminosity values are measured simultaneously.

It is useful to note that the full on/full off method effectively measures the dynamic contrast ratio of a display, while the ANSI contrast measures the static contrast ratio.

An LCD technology is dynamic contrast (DC), also called advanced contrast ratio (ACR) and various other designations. When there is a need to display a dark image, a display that supports dynamic contrast underpowers the backlight lamp (or decreases the aperture of the projector"s lens using an iris), but proportionately amplifies the transmission through the LCD panel; this gives the benefit of realizing the potential static contrast ratio of the LCD panel in dark scenes when the image is watched in a dark room. The drawback is that if a dark scene contains small areas of superbright light, the resulting image will be over exposed.

The trick for the display is to determine how much of the highlights may be unnoticeably blown out in a given image under the given ambient lighting conditions.

It is also common to market only the dynamic contrast ratio capability of a display (when it is better than its static contrast ratio only on paper), which should not be directly compared to the static contrast ratio. A plasma display with a 4,000,000:1 static contrast ratio will show superior contrast to an LCD (with LED or CCFL backlight) with 30,000,000:1 dynamic and 20,000:1 static contrast ratio when the input signal contains a full range of brightnesses from 0 to 100% simultaneously. They will, however, be on par when input signal ranges only from 0 to 20% brightness.

This animated gif shows a rudimentary representation of how various backlight dimming technologies work on TV. Dimming technology can drastically affect the contrast ratio of the display.

In marketing literature, contrast ratios for emissive (as opposed to reflective) displays are always measured under the optimum condition of a room in total darkness. In typical viewing situations, the contrast ratio is significantly lower due to the reflection of light from the surface of the display, making it harder to distinguish between different devices with very high contrast ratios.luminance of the display, as well as the amount of light reflecting off the display.

A few years ago there was widespread exuberance in the A/V consumer world when NEC or Panasonic announced that the newest version of their gas plasma display (that"s what we called them then) delivered an astounding 3000 to 1 contrast ratio. Today manufacturers advertise contrast ratios approaching and above 1,000,000:1.

Truth is that a 3000:1 contrast ratio would be almost unbelievable even today if evaluated on a post calibration, whole screen, ANSI checkerboard pattern basis. The highest I have measured on a recent flat panel display was nearing 1600:1.

For a long time, we in the A/V world have been harboring secrets about the testing methods used for such measurements as contrast. Contrast ratio stands out as probably the most blatant and ridiculous example of irrelevant manufacturers specifications.

used the backlighting to increase contrast by increasing brightness. LCD TVs often suffer from hazy, washed out blacks, especially when viewed from an angle greater than 30° off center.

The contrast ratio (CR) is a property of a display system, defined as the ratio of the luminance of the brightest color (white) to that of the darkest color (black) that the system is capable of producing.

If the LCD contrast is too low, it is hard to read. Different applications have different contrast requirement. For normal reading, the contrast needs to be >2; for medical, the contrast needs to be >10, for welding helmet, contrast should be >1,000.

The higher the efficiency, the better of the LCD contrast . It is especially important for negative display. Change from 98% to 99.9% polarizer, the contrast can increase from 45 to over 1000 for negative LCD, but for positive LCD, the contrast increases from 7 to 10 for positive LCD.

Positive LCD to Negative LCD (When the LCD is used indoor or dark environment, The contrast will increase a lot, but it will not display well with ambient light only, it is also more expensive)

For negative display, black mask can block the light bleeding, the contrast can be improved. Black mask can be done either outside cell (low cost) and inside cell (high cost).

A common claim on monitor spec sheets is an unfathomably high contrast ratio. Contrast ratio is the measurement of the ratio between the darkest black and the brightest white a display can produce. It sometimes reaches as high as 1,000,000:1, or in the case of the Samsung 200 Series monitors, “Mega Infinity Contrast Ratio” — yes, that’s a real term used by a real company. It’s as absurd as it sounds.

The best monitors we’ve reviewed barely break 1,000:1 when we measure them with a calibration tool. Televisions do better, but until desktop displays receive OLED technology, they’ll continue to lag behind. Monitors with a measured contrast ratio above 1,000:1 are the cream of the crop.

That’s static contrast ratio, as opposed to dynamic contrast ratio, which is what most manufacturers quote. Static indicates the widest distance between dark and light a monitor can project at a given brightness setting.

Dynamic contrast ratio uses a different measurement. Often, it involves measuring the absolute darkest black and the brightest white, even if each is measured at different display settings. The black reading might be taken with the display backlight nearly turned off, for example, while the white is taken with it at absolute maximum. Dynamic contrast ratio is not a standardized measurement so you can’t ever see all that contrast at once.

Manufacturers often only advertise the dynamic ratio. A third of the LCD monitors for sale right now on the popular retail site NewEgg are listed as having a 10,000:1 or higher contrast ratio. That’s almost 10 times higher than the best contrast ratio we’ve ever measured. 166 monitors (about 6 percent) list a contrast ratio of 10,000,000:1 — and all of them are from Acer or Asus.

Take, for example, the Asus ROG Swift PG27AQ. It’s a high-refresh-rate gaming monitor that’s certain to make games look smoother than a standard 60Hz panel. But you might be wondering how much nicer, exactly, so Asus prepared this handy graphic.

Below, for example, we see BenQ apply blur to supposedly simulate a lower refresh rate, and AOC use a simple contrast filter on a static image to simulate a feature that allegedly creates a more vivid image.

It’s not outright lying, but it is a clear exaggeration, and it’s certainly misleading. Especially for users who haven’t spent a lot of time looking at monitors in person, it’s becoming increasingly difficult to tell just how useful these features are.

One of the reasons manufacturers can get away with these hijinks is that the average user doesn’t have access to calibration tools that might reveal the truth. We use a DataColor Spyder4Elite in our testing and calibration process, and that’s a $300 piece of kit, which is about what most users are likely to spend on a monitor every few years. And it’s not a particularly fancy piece of equipment. The best calibration hardware costs thousands of dollars. Most people don’t have it, so they have no way to know if a monitor lives up to its claims.

But that’s no excuse. Misleading claims are bad for buyers and ultimately breed distrust. It’s easy to claim a high contrast ratio to make a product look better, and a normal buyer may not catch on at first. But eventually they’ll realize what’s up, and get fed up – perhaps so much so, that they no longer see the point in trying to buy a great monitor and resort to a budget model.

That would be a shame. A great monitor can make a PC way more fun, especially for those who like to watch movies and play games. As our own reviews have shown, there’s a big difference between the best and worst displays. Don’t get suckered into the hype. Do your research, and buy the display that truly excels.

Samsung India offers TFT LCD Monitor with 7,000:1 Dynamic Contrast Ratio. The model number of TFT LCD Monitor with 7,000:1 Dynamic Contrast Ratio is 743NX.

5 ms fast response time virtually eliminates any blurring, making this monitor good for enjoying video games and all of the digital entertainment.Magic Color technology gives vibrant colours on the monitor.Magic Tune provides convenient software OSD interface.Magic Bright technology automatically optimizes brightness, contrast, and gamma correction, based on the specific application.

Specifications of Samsung`s TFT LCD Monitor with 7,000:1 Dynamic Contrast Ratio:Screen Size: 43cm [17 inch]Resolution: 1280 x 1024Response time: 5msViewing Angle [Horizontal/Vertical]: 170 Degree /160 DegreePower Consumption: 30 Watts

First, the display screen on a sunlight readable/outdoor readable LCD should be bright enough so that the display is visible under strong sunlight. Second, the display contrast ratio must be maintained at 5 to 1 or higher.

Although a display with less than 500 nits screen brightness and a mere 2 to 1 contrast ratio can be read in outdoor environments, the quality of the display will be extremely poor. At i-Tech, a truly sunlight readable display is typically considered to be an LCD with 1000 nits or greater screen brightness with a contrast ratio greater than 5 to 1. In outdoor environments under the shade, such a display can provide an excellent image quality.

Luminance is the scientific term for hotopic Brightness?which specifies the visual brightness of an object. In layman"s terminology, it is commonly referred to as brightness? Luminance is specified in candelas per square meter (Cd/m2) or nits. In the US, the British unit Foot-lamberts (fL) is also frequently used. To convert from fL to nits, multiply the number in fL by 3.426 (i.e. 1 fL = 3.426 nits).

Luminance is a major determinant of perceived picture quality in an LCD. The importance of luminance is enhanced by the fact that the human mind will react more positively to brightly illuminated scenes and objects. Users are typically more drawn to brighter displays that are more pleasing to the eye and easier to read. In indoor environments, a standard active-matrix LCD with a screen luminance around 250 nits looks good. However, a sunlight readable LCD with a screen luminance of 1,000 will look even more beautiful.

Contrast ratio (CR) is the ratio of luminance between the brightest �white� and the darkest �black� that can be produced on a display. CR is another major determinant of perceived picture quality. If a picture has high CR, you will judge it to be sharper and more crisp than a picture with lower CR. For example, a typical newspaper picture has a CR of about 5 to 7, whereas a high quality magazine picture has a CR that is greater than 15. Therefore, the magazine picture will look better even if the resolution is the same as that of the newspaper picture.

A typical AMLCD exhibits a CR between 300 to 700 when measured in a dark room. However, the CR on the same unit measured under ambient illumination is drastically lowered due to surface reflection (glare). For example, a standard 200 nit LCD measured in a dark room has a 300 CR, but will have less than a 2 CR under strong direct sunlight. This is due to the fact that surface glare increases the luminance by over 200 nits both on the white and the black that are produced on the display screen. The result is that the luminance of the white is slightly over 400 nits, and the luminance of the black is over 200 nits. The CR ratio then becomes less than 2 and the picture quality is drastically reduced.

i-Tech sunlight readable LCDs with 1500 nits screen brightness will have a CR over 8 with the same amount of glare under the same strong sunlight, making the picture quality on these units extremely good. For further reading on contrast ratio, please see Tech Note 0101, Page 2, the Display Contrast Ratio.

The viewing angle is the angle at which the image quality of an LCD degrades and becomes unacceptable for the intended application. As the observer physically moves to the sides of the LCD, the images on an LCD degrade in three ways. First, the luminance drops. Second, the contrast ratio usually drops off at large angles. Third, the colors may shift. The definition of the viewing angle of an LCD is not absolute as it will depend on your application.

Most LCD manufacturers define viewing angle as the angles where the CR (contrast ratio)^3 10. For LCDs designed for less demanding applications, the viewing angle is sometimes defined as the angles where the CR^3 5.

For LCDs used in outdoor applications, defining the viewing angle based on CR alone is not adequate. Under very bright ambient light, the display is hardly visible when the screen luminance drops below 200 nits. Therefore, i-Tech defines the viewing angles based on both the CR and the Luminance.

All LCD backlights powered by cold cathode fluorescent lamps (CCFL) require inverters. An inverter is an electronic circuit that transforms a DC voltage to an AC voltage, which drives the CCFLs. i-Tech Technology manufactures inverters for all its products. Additionally, Applied Concepts and ERG also provide inverters for our products as well.

The dimming range or dimming ratio of an inverter specifies its capability of performing backlight luminance adjustment. For inverters used in notebook computers and LCD monitors, the backlight luminance can be adjusted typically over a dimming range of less than 10:1. That is, the luminance is adjusted from 100% down to about 10%.

For very high brightness backlights used in i-Tech Technology sunlight readable LCD modules, the inverters must be able to provide a much wider dimming range. Otherwise, the LCD screen will be too bright during nighttime conditions. Therefore, our inverters provide a typical dimming ratio of 200:1, meaning that the luminance can be adjusted from 100% down to 0.5%.

Any high brightness backlight system will consume a significant amount of power, thereby increasing the LCD temperature. The brighter the backlight, the greater the thermal issue. Additionally, if the LCD is used under sunlight, additional heat will be generated as a result of sunlight exposure. Temperature issues can be handled through proper thermal management design.

We provide TFT LCD with reflective mode of illumination without compromising its transmissive illumination. With the imposed reflective function, the modified LCD can reflect the ambient light passing the LCD cell and utilize the reflected light beams as its illumination. The stronger the ambient light is, the brighter the LCD will appear. As a result, the modified LCD is viewable under all lighting conditions including direct sunlight regardless the LCD"s original brightness.

The market demands for outdoor LCD applications are expanding, such as mobile navigator/video systems, PDA, personal organizer, Tablet PC, notebook computer, and Kiosk display etc. However, a regular transmissive LCD is very difficult to read under strong ambient light. This limits the outdoor applications of a conventional transmissive LCD.

The high bright LCD and the transflective LCD are the solutions generally utilized for outdoor applications. However, both solutions have some shortcomings. Because of the added lamps, high bright LCD creates some undesirable problems, which include high power consumption, excessive heat generation, increased dimensions, electrical circuit alterations, and shortened LCD lifetime. Thus, it is usually troublesome and costly to accommodate a high bright LCD in systems. Though giving good performance under the direct sunlight, the transflective LCD trades of its indoor performances.

Problems noticed in transflective LCD include narrow viewing angle, discoloration, low brightness, and loss of contrast. Moreover, the transflective LCD is currently limited in choice of sizes and resolutions.

On the other hand, a Transflective LCD is readable everywhere including outdoor environments without extra power consumption and excessive heat generation. The indoor viewing qualities are also enhanced. The modified unit fits right back into its original system with no need of any alteration and extra effort. Thus in your choice of size, resolution, and model, a direct sunlight readable LCD is conveniently incorporated into your device.

i-Tech is a premier supplier of optical bonding and performance added passive enhancements for all flat panel . i-Tech Optical Bonding process produces an optical bond between any display cover glass or touch panel, and any size LCD.

In the world of LCD"s, i-Tech takes display enhancement to a new level above all others. Utilizing advanced proprietary optical bonding technology; i-Tech overcomes optical challenges for display product manufacturers at an affordable price. In a wide range of applications, standard liquid crystal appear to "washed out" in high ambient lighting conditions. This wash out is due to excessive reflections and glare caused by bright light.

Commercially available LCDs, especially when protected by a separate cover glass or plastic shield, can not deliver enough brightness to make the display functional in outdoors or in other high ambient light applications. The exclusive Optical Bonding process from i-Tech provides a significant reduction of ambient light reflections at an affordable price, compared to other display enhancement technologies.

Optical Bonding seals either a top cover glass or touch screen directly to the face of the display bezel. Our bonding process eliminates the air-gap between the display and the cover glass, vastly reducing reflective light, which causes visual washout of the display image. Optical Bonding also enhances structural integrity by supporting the LCD assembly with the cover glass. The bond maintains perfect display uniformity while providing shock protection, unlimted humidity protection, and elimination of fogging caused by trapped moisture accumulating in typical air-gap assemblies.

Light travels through a variety of transparent materials; such as air, glass, plastic, and even water. These material"s abilty to transmit light is measured by their "indices of refraction". As light transfers from one material to another, such as air to glass, the differences the index of refraction will cause reflection. In the case of an air-to-glass interface, the reflection will be slightly less than 5% of the ambient light. All surfaces that have an index mismatch will reflect and the reflection is cumulative. In the case of a standard glass or plastic window, there are three surfaces with an index mismatch which will create a total relfection of nearly 15% of the ambient light. If the total reflection (in nits) is close to the displays brightness, the contrast of the display will be reduced to the point where the display"s readabilty is reduced to unacceptable levels.

Aside from the optical quality, Optical Bonding elminates the air-gap which prevents heat build-up from the "greenhouse" effect and prevents fogging from moisture or contamination from dirt or particles. It also offers shock protection and other damage to the LCD itself.

iTech IP65 Front and Full IP66 Chassis are designed for those applications require IP ( Ingress Protection ) feature, like chemical industry, food industry and medical industry. However, the IP65 Front and Full IP66 chassis might get moisture condensation issue for the applications under direct sunlight.

We provide two different choices of optical enhancement solutions that include anti-reflective coated and/or anti-glare protection glass. These technologies can be widely used in outdoor and indoor environment by enhancing optical performance of displays.

The anti-reflective coatings on the protection glass have excellent performance in tough ambient light conditions. With the normal glass, the strong reflection of the ambient light diminishes visibility and causes problems for viewer. Our special anti-reflective coated protection glass can increase contrast by enhancing light transmission rate over 95% (light reflectance rate less than 5%) and can effectively diminish the mirror images. The multi-layer vapor deposition coating either on one side or two sides of glass is designed to minimize reflectance and maximize transmittance.

Clearing Point - The temperature at which the liquid crystal fluid changes from a nematic into an isotropic state. In practice, a positive image LCD will turn totally black at this temperature and will therefore be unreadable. Because the clearing point is different for every fluid type, ask for design assistance from your supplier if high temperature operation is critical in your application.

Also, for most cases, both TN, HTN and STN utilize the phase known as nematic for display purpose. Within this phase, the liquid crystal has a "rod shape" exists within the solution which has fast response and has excellent electro-optic properties. This phase, however, only exists within a limited temperature range. The higher end of this temperature range is known as clearing point, above which, the liquid crystal lost its birefrigerance properties and cannot bend the light path anymore. Thus the polarizer will then be the only factor which affect incoming and out coming light. When the LCD is cooled down to below its clearing point, the display should be working again. The temperature for the clearing point varies greatly from material to material and you should contact our engineers regarding what you have. Normally a safe margin should be used to avoid clearing point when designing the display.

The lighter sensor measures the outside brightness according to different environments and sends the information to display. Display will adjust the brightness automatically.

Winmate �light sensor� technology are now available for 8.4�, 10.4�,12.1�, 15�, 17�, and 19� LCD with specific panel option. Please contact with sales for more detail information.

TouchScreen Solutions is a specialist manufacturer of touchscreens, optical filters to enhance the performance of electronic displays, and transparent composites.

The electronic controls effectively divide the screen into pixel sized sensing cells, using microfine wires which are not visible on a powered display. These wires are connected to a controller board, and an oscillation frequency is established for each wire. Touching the glass causes a change in the frequency of the wires at that particular point, the position of which is calculated and identified by the controller. Unlike other capacitive systems where the operator touches the actual conducting surface of the sensing panel, the active component of the sensor can be embedded up to 25mm from the touch surface ensuring long product life and stability.

The touchscreen can be supplied with the options of anti�glare or anti-reflection coatings, thermal toughening or chemical strengthening and privacy or contrast enhancement filters. The front glass of the touchscreen acts as a dielectric and enhances the capacitance of the touchscreen.

Touchscreen is proven to meet today�s demanding requirements for ATM�s, web phones, ticket machines, medical displays, industrial displays, pay-at-the-pump gas machines, and interactive kiosk systems. The touchscreen is durable and dependable, its construction protects against damage caused by moisture, heat and even vandalism.

Simple calibration and set-up with Windows 98, NT, 2000, XP and Linux. Mouse emulation with Select on Touch, Select on Dwell, Select on Release and Drag and Drop.

1. How much power consumption is the extreme high brightness LCD? It is very important because all of our outdoor LCD is in completely sealed enclosures keeping it cool is a very huge Challenge. Not mentioned the hot temperature around 40-50C area.

2. Also, you need to determine how far is viewer distance. Because high brightness (3000-5000nits LCD) might Damage eyesight if the viewer is too closed. LCD is design with high resolution for people to see it very closely, so extreme high brightness doesn"t make sense for outdoor LCD. If they want to put on extreme high brightness LCD on roof top to attract audience which LCD is not even big enough for seeing from far away. Most case customer will use LED which is more reliable and cost effective if it is larger than 82".

3. High chance rejection from city sign official. Many LED billboard brightness can goes up to 5000-7000nits, but the local government agency will not approve this brightness, because it is traffic distraction for driver or other people. So, it doesn"t make sense to spend a fortune on extreme high brightness but need to dim it down back to 1000-1500nits.

4. Viewable under sunlight is not just brightness only, it involve contrast ratio, reflection of the front glass and content graphics contrast such as (red and white). Sunlight readable is combination of all above, not just brightness only.

4. Viewable under sunlight is not just brightness only, it involve contrast ratio, reflection of the front glass and content graphics contrast such as (red and white). Sunlight readable is combination of all above, not just brightness only.

3. All the major branded LG and Samsung LCD manufacturer the most brightness that they do is only 1000-2000nits because we believe this major LCD maker already done a study on what is the most feasible and comfortable LCD brightness for outdoor. That"s why all the high brightness (3000-5000nits) maker is after market vendor without any study about the what is most suitable brightness for different applications, only advertising high brightness is not the solution. If you ask these vendor for outdoor enclosure which they will not provide or guaranteed it will work because they know it is a huge Challenge to cool down the display. Just like you are buying a 800 horse power car, but you still need to design the car frame and cooler to make this engine run safely on the road, which this extreme high brightness won"t help you to design that.

Panasonic"s display arm, Panasonic Liquid Crystal Display Company, has announced the development of an in-plane switching (IPS) panel family boasting 1,000,000:1 static contrast ratio - the highest ever claimed by an LCD manufacturer.

Those who have been shopping for a monitor or TV in the last decade or so will be all too familiar with manufacturers" tendency to overstate the contrast - the distinction between fully-white and fully-black on the same panel - of their displays. Typically, this involves claiming a 1,000,000:1 "dynamic" contrast ratio - a trick which lowers the backlight level in dark scenes and boosts it in bright scenes to simulate high contrast. Panels based around organic light-emitting diode (OLED) technology, by contrast, have a high static contrast thanks to the ability to toggle the lighting on a per-pixel rather than per-panel or per-zone level, but these displays are more costly and complex to manufacture.

Panasonic"s display division"s new screens, though, are claimed to offer a 1,000,000:1 static contrast ratio for the first time in an IPS LCD panel - some 600 times higher, the company claims, than its nearest competition. The company"s technology is based around light-modulating cells permitting pixel-by-pixel control of backlight intensity in much the same way as OLED panels but, it claims, without the need to upgrade existing liquid crystal panel manufacturing equipment - greatly dropping the cost compared to retooling for OLED.

According to Panasonic"s internal testing, the panels treated with the additional layer of light modulating cells are capable of displaying a brightness of 1,000 candela per metre squared (cd/m²) and 0.001cd/m² simultaneously, without losing the viewing angles or colour gamut of the IPS panel. It plans to manufacture the panels in a range of sizes, from large-scale TV panels to professional-grade monitors for medical and industrial use and even down to in-car computer displays.

Since 1986, Broadax Systems, Inc. has been a leading industrial computer systems manufacturer and customized solutions provider. We offer high performance and high quality industrial computers such as industrial rackmount computers, lunchbox style portable computers, low profile embedded computers, touch screen panel PCs, and rackmount LCD keyboard drawers.

Customer satisfaction as well as guaranteeing high performance solutions that meet your requirements is Broadax Systems" top priority. As a valued Broadax Systems" customer, you are entitled to the same services and advanced computing solutions as our Fortune 500 customers such as Boeing, Lockheed Martin, Northrop Grumman, Raytheon and Harris.

Have you ever looked at video on a (non-ToteVision) TV or monitor and noticed the white areas were not very white, or maybe the black areas looked gray? What you were seeing is the contrast of the monitor, and while it could be adjusted through changing the settings, there is a specific contrast ratio that was created when the LCD panel was made; it is a limitation of the panel.

Contrast ratio is an essential specification that indicates the difference between the lightest (white) area of an image on the monitor/TV screen and the darkest (black) area. It is depicted as a larger number compared to the number ‘one’ (ie. 1,000:1 which we refer to as “one thousand to one contrast”). We consider ‘one’ as the baseline and the other number as the range of contrast; the larger the number, the greater the contrast.

There are two types of contrast numbers and the variance between them is typically huge and getting bigger all the time. The first type is called Static Contrast, or what is also called ‘native’ contrast because it is the tested results from when the panel was made. In the panel specs, there is a minimum to maximum contrast range, and a typical contrast which we manufacturers refer to as the Static Contrast. This contrast level is an accurate expectation of the panel’s contrast performance.

The second type is called Dynamic Contrast, which is theoretically attainable but the contrast range is uncertain since there isn’t a basis for testing. When dynamic contrast was first used as a specification, it was the contrast range between the lightest areas of a video scene that is all white and light compared to another video scene that displayed the darkest areas of a black and dark scene. It was a bit of marketing hype as a viewer was not able to actually experience this dynamic contrast range all in one scene, and there was the physical limitation of the screen panel specification that already specified the native contrast for the panel. Over time, there were TV manufacturers that attempted to justify their dynamic contrast range claim by having their engineers create firmware that was capable of increasing the contrast within a specific scene, so if a video scene was dark, then the viewer may see more shades of dark.

The bottom line is to not take th