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The Difference Between LED Display Gray And Brightness

Shenzhen Lights Technology Co.,Ltd | Updated: Apr 15, 2016

LED display gray is the so-called color scale or gray scale refers to the degree of brightness and shade. For the digital display technology, the gray color is to determine the number of factors suggest. Generally the higher the gray level, the richer the color display screen display, the picture is more delicate, more performance of rich detail.

LED display gray scale depending on the system A / D conversion bits. Of course, the system of video processing chip, memory and transmission systems must provide appropriate support for the median job. At present, LED display mainly uses eight processing system, that 256 (28) levels of gray. Simple understanding is that 256 kinds of brightness change from black to white total. Using RGB color can constitute a 256 × 256 × 256 = 16777216 colors. It is known as 16 million colors. International brand display mainly uses 10-bit processing system, the 1024 gray, RGB primary colors may constitute 1.07 billion colors.

Although gray factors in determining the number of colors, but it does not mean unlimited bigger the better. First, because the resolution of the human eye is limited Furthermore, the median increase system processing will involve changes in the system of video processing, storage, transmission, scanning all aspects of the cost increase, the price decreased. In general civil or commercial-grade products can be used 8 system, the broadcast products can be 10-bit systems.

Identification of brightness level

Brightness discrimination level refers to the human eye can distinguish the image from the black to white between the brightness level. Mentioned gradation display some high, can reach 256 or even 1024. However, due to the limited sensitivity of the human eye to brightness, and can not fully identify these gradation. That may be a lot of adjacent level gray eye looks the same. And the eyes ability to distinguish different person. For display, the human eye's natural level is better, because the displayed image after all posters. The human eye can distinguish brightness level, the greater the color space of the display means to display the rich colors of the greater potential. Brightness discrimination level can use special software to test generally able to display more than 20, even if the level is good.

Gray nonlinear transformation

Gray nonlinear transformation refers to the gradation data in accordance with the empirical data or some arithmetic nonlinear relationship transform and then provided to display. Because LED is a linear device, with non-linear display characteristics different from traditional monitors. In order to make LED display is able to meet the traditional data source without loss of gray level, usually after the LED display system-level gray-scale non-linear transformation of data will be done, the data bits after conversion will increase (without losing gray data).

Now some domestic control system supplier so-called 4096 gray or 16,384 gray or higher are after nonlinear transformation refers to the gray space. 4096 is the adoption of eight sources to the 12 space technology nonlinear transformation, 16384 is the use of 8-16 non-linear transformation technique. 8-bit source as nonlinear transformation, the converted space certainly than 8 sources large. Usually at least 10. As gray as this parameter is not bigger is better, generally 12 can do enough transformed.

So for gray scale and brightness size, not the bigger the better, but according to customer demand, the right size and brightness of the gray but will take to unexpected results.

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