Regardless of whether LEDs are used to make monochromatic, two-color or three-color screens, the brightness of each LED constituting the pixel must be adjustable to display an image. The fineness of the adjustment is the gray level of the display screen. The higher the gray level, the more delicate the displayed image, the richer the color, and the more complex the corresponding display control system. Generally, 256-level grayscale images have very soft color transitions, while 16-level grayscale color images have obvious color transition boundaries. Therefore, color LED screens are currently required to be made of 256 to 4096 gray levels.
Outdoor LED display is a new type of information display media, which is a flat display screen composed of light-emitting diode dot matrix modules or pixel units. Figure 2 shows the structure of the 8×8 dot matrix outdoor LED display. From the figure, the 8×8 dot matrix requires a total of 64 light-emitting diodes, and each light-emitting diode is placed at the intersection of the row line and the column line. When the corresponding row is set to high level and a certain column is set to low level, the corresponding diode will light up.
