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| LED display of grayscale and luminance difference |
Source:MaChen Yushengyuan New energy Co., Ltd. Time:2012-05-03 16:00:16 |
LED display of grayscale and luminance difference
We often hear that the LED display gray scale is the brightness, then you know in the end the number of gray level and brightness of the LED display? Let us look at the explanation given by the step sharp optical professionals.
LED display gray scale is the so-called gradation or grayscale, refers to the brightness of light and shade extent. The digital display technology, the gray-scale determinants of the number of colors displayed. Generally speaking, the higher the gray level, the display screen to display the richer the color, the picture is more delicate, more performance to a wealth of detail.
LED display gray scale depending on the system A / D converter median. Of course, the video processing chip, memory and transmission systems must support the job of the corresponding digit. Domestic LED display with 8 processing system, that the gray levels of 256 (28). Simple to understand from black to white, a total of 256 kinds of changes in the brightness. Using RGB constitute a 256 × 256 × 256 = 16777216 colors. Commonly known as 16 million colors. International brands display 10-bit processing system, ie 1024 gray, RGB primary colors can constitute 1.07 billion colors.
Although the gray scale is to determine the determinants of the number of colors does not mean that unlimited bigger the better. The first resolution of the human eye is limited. Furthermore, the system-digit increase will involve changes in all aspects of the system, video processing, storage, transmission, scanning, spiral of increasing costs, cost reduction rather than. Generally speaking, civil or commercial-grade products can be used 8 system, the broadcast can be used 10 systems.
(1) brightness differential rating
Identification of the brightness level is a brightness level between the human eye can distinguish the image from the black to the whitest. Mentioned earlier, the gray scale of some very high, can reach 256 or even 1024. However, due to the limited sensitivity of the human eye perceives brightness, and can not be fully identified these gray levels. That is probably many of the adjacent levels of gray scale of the human eye looks the same. And the eyes ability to distinguish each person is different. The level of the display, the human eye to identify natural is better, because the displayed image, after all, posters. The more the human eye can distinguish between the level of brightness means that the larger the display color space to display rich color, the greater potential. Brightness differential rating can use special software to test the general display of 20 or more even better grades.
② gray-scale non-linear transformation
Gray-scale nonlinear transformation is the grayscale data in accordance with the empirical data, or some kind of arithmetic non-linear relationship to transform and then to the display shows. Since the LED is a linear device, with the traditional display nonlinear characteristics. In order to enable the LED display effects can conform to a traditional data source without loss of gray level, the general level in the LED display system will do the non-linear transformation of the gray-scale data, the median of the transformed data will increase (to ensure that no loss of gray data).
4096 grayscale with the so-called domestic control system supplier or 16384 gray scale or higher, refer to the size of the gray space after nonlinear transformation. 4096 is the adoption of non-linear transformation of the eight sources to the 12 space technology, 16384, 8-16 non-linear transformation. From 8 sources as nonlinear transformation, the converted space is definitely better than the eight source. Generally at least 10. As gray-scale, this parameter is not bigger is better, generally 12 can do enough to transform.
Therefore, the size of the gray level and brightness, not the bigger the better, but according to customer demand, the appropriate grayscale and luminance size it will take to an unexpected effect.
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