1. To modulate the pulse width, use the changing frequency that the human eye can perceive, and use the pulse width modulation method to achieve gray scale control, that is, to periodically change the light pulse width. Pulse width modulation is more suitable for digital control and has been widely used. The most common method is to adopt a microcomputer. At present, almost all LED displays adopt pulse width modulation to control the gray level.

　　2. Ordinary LED tubes allow a continuous task current of about 20 mA. By changing the current flowing through the LED, except for the saturation of the red LED, the brightness of the remaining LEDs is basically proportional to the current flowing.

Adjustment of white field color coordinates

　　 White field color coordinate adjustment is one of the most basic technologies for full-color LED displays. However, in the mid-1990s, due to the lack of industry standards and basic testing methods, the white field color coordinates were usually determined by human eyes and feelings, resulting in serious color cast and random white field color temperature. With the promulgation of industry standards and the completion of testing methods, many manufacturers have begun to standardize the color matching process for full-color screens. However, due to the lack of theoretical guidance for color matching, some manufacturers often sacrifice the gray levels of certain primary colors to adjust the 100-field color coordinates, and the overall performance cannot be improved.

　　 color adjustment

　　 HD LED display is displayed according to the principle of three primary colors of light. Determining one of the red, green, and blue colors as the benchmark is mainly based on the different brightness of the selected product red, green, and blue colors. Generally, the brightness benchmark is the one with a low brightness ratio. When the benchmark is a kind of When the maximum brightness has been reached, it is necessary to adjust another color for a two-color LED display, and for a full-color LED display, it is necessary to adjust the colors of the other two LEDs.