How to calculate the brightness of industrial display screens?
When choosing an industrial display, many end customers often pay attention to its various parameters. One of them is screen brightness, but many manufacturers have different brightness units. What do they mean? How to convert? What reference value do they have for the performance of industrial displays?
Hangzhou Zhongyou Touch Display will explain to you below: For display devices, brightness is a very critical performance measurement indicator. The unit of brightness is candela per square meter (cd/m2) or nits. Just like the power of a car engine is expressed in “horsepower”, so is nits. It represents the brightness of a display equivalent to the brightness of how many candles. The brightness emitted by a 300-nit desktop display is equivalent to the brightness of 300 candles in a 1-square-meter space. A 1500-nit outdoor display is equivalent to the illumination of 1500 candles.
In addition, nits are different from ANSI lumens (a common specification in front projection solutions). 1 lumen represents the amount of light reflected by a candle per square meter at a constant distance. Reflected light can be measured in lumens, while nits measure direct light. This is why projector brightness is usually measured in lumens, while displays (including rear projection) are measured in nits. Sometimes projection installations are measured in foot-lamberts (FL), which is equivalent to 1 lumen per square meter, to give brighter rooms a higher perceived brightness of the screen’s reflection. 1 nit is equivalent to about 0.292FL.
Back to displays, in order to measure the brightness of a display, you need something to display on the screen. Typically, brightness is measured from edge to edge, top to bottom, when the screen is displaying a full white image. For displays that require a backlight, such as LCDs, the full white measurement will tell you the maximum light output the display can achieve. While it’s unlikely that you’ll ever display a full white image on the screen, this number represents the highest brightness the display can achieve.
For self-emissive display devices, such as plasma, PMOLED, or AMLED screens, brightness calculations are more difficult. Because each pixel is directly addressed (and turns on or off based on what’s directed at that pixel), the brightness of each pixel varies as the power to drive that pixel is shared among all the pixels. For example, a full white picture will be less bright than a small white square in the middle of the screen. These two situations represent two common indicators, one is the standard brightness measurement (ie, typical value), and the other is the peak brightness measurement (ie, peak value).
It should be made clear here that if someone asks “how bright is this display device”, it is difficult to answer him directly. This depends on the specific measurement value, the display technology used, and the content displayed on the screen when the measurement is made.
The size of the brightness directly determines the use requirements of the LCD screen. First of all, the importance of display brightness is mainly reflected in:
1. Visual effect
Clear display
Sufficient brightness can ensure that images and text are clearly visible under different ambient light. For example, in bright indoor environments such as shopping mall display areas, or outdoor places with direct sunlight, high-brightness LCD screens can overcome the interference of ambient light, so that the displayed content will not become blurred due to excessive ambient light.
For high-resolution images and videos, high brightness can better show details and color levels, making the picture more vivid and realistic. Color vividness brightness is closely related to color saturation. Higher brightness can make colors more vivid and bright, and enhance visual impact. For example, in the fields of advertising display, film and television production, high-brightness LCD screens can better present rich colors and attract the attention of the audience. For professional graphic design and photography post-processing, accurate color and sufficient brightness are one of the key factors to ensure the quality of the work. 2. Application scenarios Outdoor applications For outdoor billboards, traffic information display screens and other equipment, the LCD screen needs to have a high brightness to display normally under direct sunlight. Generally speaking, the brightness of outdoor LCD screens usually reaches thousands of nits or even higher to ensure clear visibility under various weather conditions. The brightness of outdoor LCD displays must be at least 500cd/m2, and outdoor monitoring equipment also requires a high-brightness LCD screen of at least 1000cd/m2, so that operators can clearly observe the monitoring screen under strong light and detect abnormal conditions in time. Industrial control field In industrial environments such as factory workshops and control rooms, there may be strong light interference. High-brightness LCD screens can ensure that operators can accurately read equipment parameters, monitor production processes and other information under complex lighting conditions, and improve work efficiency and safety. Some special industrial applications, such as aerospace, military equipment, etc., have extremely high requirements for the brightness and reliability of LCD screens to ensure that they can work normally in various harsh environments. Medical equipment and medical displays require high brightness and high contrast so that doctors can clearly observe medical images, such as X-rays, CT scan images, etc. Accurate diagnosis depends on clear image display. High-brightness LCD screens can provide better visual effects and help doctors make more accurate judgments. In environments such as operating rooms, high-brightness LCD screens can ensure that doctors can still clearly see various information during surgery under strong light, improving the safety and success rate of surgery.
3. User experience
4. Reduce visual fatigue Appropriate brightness can reduce eye fatigue. If the LCD screen is not bright enough, users may unconsciously move closer to the screen or squint their eyes in order to see the content clearly. Long-term use will cause eye fatigue, dryness and even vision loss. High-brightness adjustable LCD screens can be adjusted according to user needs and changes in ambient light to provide a comfortable visual experience. For users who use LCD screens for a long time, such as office workers, gamers, etc., a good brightness setting can reduce visual fatigue and improve work and entertainment efficiency. Enhance readability Whether reading documents, browsing web pages or reading e-books, high-brightness LCD screens can improve the readability of text. Clear text display can reduce reading errors and improve reading speed and comprehension. For the elderly and people with poor eyesight, high-brightness LCD screens can provide larger fonts and clearer display effects, making it easier for them to use electronic devices. In order to better reflect the effect of the LCD screen, in general, the brightness of indoor display screens can reach about 300cd/m2. If it is a high-brightness LCD screen displayed outdoors, it is best to reach more than 500cd/m2. The brightness is also 800cd/m2, 1000cd/m2, 1500cd/m2, etc.! The brightness of indoor display screens can reach about 300cd/m2. If it is a high-brightness LCD screen displayed outdoors, it is best to reach more than 500cd/m2. The brightness is also 800cd/m2, 1000cd/m2, 1500cd/m2, etc.! The brightness of indoor display screens can reach about 300cd/m2. If it is a high-brightness LCD screen displayed outdoors, it is best to reach more than 500cd/m2. The brightness is also 800cd/m2, 1000cd/m2, 1500cd/m2, etc.!
12.1 inch G121XN01 V0 AUO TFT LCD 500 nits for Industrial
