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Gray scale of LED display

Gray is also called gray scale, which refers to the degree of brightness. For digital display technology, grayscale is the decisive factor to display the number of colors. Generally speaking, the higher the grayscale, the more colorful the display is, the more delicate the picture is, and the more abundant details it is showing.


The gray level is mainly determined by the number of bits in the system.Of course, the system's video processing chip, memory, and transmission system must provide support for the corresponding number of bits. Currently LED display is mainly used:

One, 8-bit processing system, that is 256 (two to the eighth power) level grayscale. A simple understanding is that there are 256 kinds of brightness changes from black to white.

Two, 10-bit processing system, which is 1024 (two to the tenth power) level grayscale. A simple understanding is that there are 1024 kinds of brightness changes from black to white.

Three, 12-bit processing system, that is, 4096 (two to the twelfth power) level grayscale. A simple understanding is that there are a total of 4096 kinds of brightness changes from black to white.

Four, 14-bit processing system, which is 16384 (two to the fourteenth power) level grayscale. A simple understanding is that there are 16384 kinds of brightness changes from black to white.


Gray scale is the determining factor of color performance. The increase in the number of processing bits in the system will involve changes in the system video processing, storage, transmission, and scanning. In general, private use of the display can use 8-bit or 10-bit system, commercial or broadcast-level products can use 12-bit systems or even higher levels of the system.


There are two ways to control the gray level of the LED display: one is to change the current flowing, and the other is pulse width modulation. 1. Change the current flowing through the LED. The general LED tube allows a continuous working current of about 20 mA. In addition to the saturation of the red LED, the gray levels of other LEDs are basically proportional to the current flowing through; the other method is to use the visual inertia of the human eye, with a pulse width The modulation method to achieve gray control, that is, periodically change the width of the light pulse, as long as the period of this repeated lighting is short enough, the human eye can not feel the shaking of the light-emitting pixel.


The higher the gray scale, the brighter the color is.



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