As is well known, LCD screens have been applied to various industries, including industrial, military, and public sectors. Due to the unique nature of the industry, many industries have different requirements for display screen parameters. For display devices, brightness is a crucial performance measurement indicator. Today, the editor from a manufacturer of high brightness LCD screens will teach you how to calculate the brightness of a display screen.
Brightness is measured in candela per square meter (cd/m2) or nit. Just as the power of a car engine is expressed in horsepower, so is Nit. The significance it represents is that the brightness of a monitor is equivalent to the brightness of several candles. The amount of light on a 300 nit desktop monitor is equivalent to the brightness of 300 candles in a 1 square meter space. A 1500 nit outdoor display screen is equivalent to the illumination of 1500 candles.
Furthermore, nit and ANSI lumens (a universal specification in forward projection solutions) are not the same thing. 1 lumen represents the amount of light reflected by a candle per square meter at a constant distance. Reflected light can be measured using lumens, while direct light can be measured using nits. That's why projectors typically use lumens for brightness, while displays (including backprojection) use nits. Sometimes, projection installation is calculated based on foot lamberts (FL), which is equivalent to a brightness of 1 lumen per square meter, with the aim of producing higher perceived brightness screen reflections in brighter rooms. 1 nit is equivalent to approximately 0.292FL.
Returning to the LCD screen, in order to measure the brightness of the display, it is necessary to display some images on the screen. Normally, when the screen displays a full white screen, brightness measurements are taken from edge to edge and from top to bottom. For displays like LCD displays that require a backlight source, conducting full white measurements can determine the maximum light output that the display can achieve. Although it is unlikely for users to display a full white image on the screen, this value represents the highest brightness that the monitor can achieve.
For self luminous display devices (such as plasma, OLED, or LED screens), brightness calculation is more difficult. Because each pixel is directly addressed (and turned on or off based on the content pointing to that pixel), the brightness of each pixel will change as the power of the driving pixel is shared among all pixels. For example, when displaying a fully white screen, the measured brightness will be lower than the brightness of a small white square displayed in the middle of the screen. These two situations represent two common indicators, one is standard brightness measurement (i.e. typical value), and the other is peak brightness measurement (i.e. peak value).
It's clear from here that if someone asks a question about how bright this display device is, it's difficult to answer them directly. This depends on the specific measurement values, the display technology used, and what content is displayed on the screen during measurement.
Ruxin Gaoliang is committed to creating long-term value for our customers. We are a high-quality domestic LCD display manufacturer with 13 years of experience in research, development, production, and sales, specializing in various types such as high brightness screens, bar screens, and small-sized LCD screens. We provide one-on-one professional services for you.