The gray scale, also called color gradation of LED full color LED display means the light and shade degree of brightness. Generally, higher gray scale means richer color, more detailed picture and better image quality.

The gray scale of full color LED display depends mainly on bit amount of A/D of system. The improvement of bit amount would cause the changes of system video processing, storage, transmission and scan. Nowadays, most of LED displays adopt 4 processing systems which mean four different gray scales as following.

1.8 bit processing system means 256 (8th power of 2) gray scale. There are 256 luminance variances from black to white color. Adopted RGB- three primary color, 256×256×256=16777216 colors was composed.

2.10 bit processing system means 1024(10th power of 2) gray scale. There are 1024 luminance variances from black to white color.

3.12 bit processing system means 4096(12th power of 2) gray scale. There are 4096 luminance variances from black to white color.

4.14 bit processing system means 16384(14th power of 2) gray scale. There are 16384 luminance variances from black to white color.

Suggestions: It is not true that the higher the gray scale means absolutely the better the image because resolution ratio of human eyes is limited. Besides, the improvement of system bit amount will improve requirement of video processing, storage, transmission and scan. All these would lead to higher cost and low cost effectiveness.