LED Display of The Gray and Brightness Bifference Analysis
We often heard that the LED display is the number of gray, brightness is how much, then you LED display for the gray and brightness in the end know how much? Let us look at the following professionals to give the explanation. LED display gray scale is the so-called color or gray scale, is the brightness of the degree of brightness. For digitized display technology, grayscale is the determining factor in the number of colors. In general, the higher the grayscale, the more colorful the display screen, the more delicate the picture, the more detailed the rich details. LED display gray level depends mainly on the system A / D conversion bit. Of course, the system’s video processing chip, memory and transmission system should provide the corresponding number of support. At present, the domestic LED display mainly uses 8-bit processing system, that is, 256 (28) level gray. Simple understanding is from black to white a total of 256 kinds of brightness changes. RGB primary colors can be used to form 256 × 256 × 256 = 16777216 kinds of colors. That is commonly referred to as 16 megapixel. International brand display mainly uses 10-bit processing system, that is 1024-level gray, RGB three primary colors can constitute 1.07 billion color. Although gray is the deciding factor in determining the number of colors, it is not to say that the greater the better. Because the first person’s eye resolution is limited, and then increase the system processing bit number will involve the system video processing, storage, transmission, scanning and other aspects of the changes, the cost surge, cost-effective but decreased. Generally speaking, civil or commercial grade products can use 8-bit system, broadcast products can be used 10-bit system. Brightness discrimination level The brightness discrimination level refers to the brightness level of the image that can be resolved by the human eye from the darkest to the most white. The gray level of the display mentioned above is very high, can reach 256 or even 1024 levels. However, due to the sensitivity of the human eye to brightness is limited, and can not fully recognize the gray level. That is to say that many adjacent levels of gray-scale people may look the same. And the ability to distinguish eyes each person is different. For the display, the human eye recognition level is naturally the better, because the display of the image, after all, is to see people. The greater the brightness level that the human eye can distinguish, the greater the color space of the display, and the greater the potential for rich colors. Brightness discrimination level can be used to test the software, the general display can reach more than 20 even if the better level. Gray-scale non-linear transformation Gray-scale non-linear transformation refers to the gray-scale data in accordance with the empirical data or some kind of arithmetic nonlinear relationship transformation and then provided to the display. As the LED is a linear device, with the traditional display of non-linear display characteristics are different. In order to enable LED display to meet the traditional data source without loss of gray level, generally in the LED display system will do after the gray-scale data nonlinear transformation, the number of bits after conversion will increase (to ensure that no loss of gray data). Now some of the domestic control system supplier of the so-called 4096 gray or 16384 level of gray or higher refers to the non-linear transformation after the size of gray space. 4096 is the use of 8-bit to 12-bit space of the nonlinear transformation technology, 16384 is the use of 8 to 16-bit nonlinear transformation technology. From the 8-bit source to do non-linear transformation, the conversion space is certainly greater than the 8-bit source. Generally at least 10 bits. Like the same gray, this parameter is not the bigger the better, the general 12 can do enough to change the. So for the size of the gray and brightness, not the bigger the better, but according to customer demand, the appropriate size and brightness of the size but will take unexpected results.