An introduction to the countermeasures for the high brightness of full-color LED display

The brightness problem of the full-color LED display has once become a hot issue of controversy. Excessive brightness is the most reflected problem by passers-by and drivers.

The brightness of the full-color LED display directly threatens the personal safety of drivers and passers-by. The excessively high brightness of the full-color LED display makes pedestrians' eyes uncomfortable and pierces the driver's eyes, affecting safe driving. How can this problem be solved?

We can directly analyze the brightness of the full-color LED display. The following solution can solve the problem of excessive brightness of the full-color LED display and readjust the brightness and color of the full-color LED display.

1. Adjust the brightness

1. Change the current flowing through the LED. The normal LED tube allows the continuous task current to be around 20 mA. Except for the saturation phenomenon of the red LED, the brightness of the remaining LEDs is basically proportional to the current flowing.

2. Pulse Width Modulation (PWM), which uses the changing frequency that the human eye can feel, uses the pulse width modulation method to achieve grayscale control, that is, periodically changing the optical pulse width (that is, the duty cycle), only this The period of repeated lighting is short enough (that is, the refresh frequency is high enough), and the human eye cannot feel that the luminous pixels are shaking. Because pulse width modulation is more suitable for digital control, it has been widely used. The common method is to use a microcomputer to provide LED display. At present, almost all LED screens use pulse width modulation to control the gray level.

Second, the color adjustment

Full-color LED display products adjust the color of the entire screen according to the brightness of the red, green, and blue LED lights. We determine which color is the reference based on the brightness ratio of the selected product red, green and blue colors. Generally, the one with the lower brightness ratio is used as the brightness reference. When the reference one has reached the maximum brightness, adjust the other Species (dual color) or two (full color). When the display screen is two-color, the operating current of the red diode is adjusted based on green in most cases. Generally, the operating current is reduced, and the balance color yellow is used as the adjustment standard, so that the brightness of the entire display screen should be reduced. Adjusting the color of the display screen to the best balance will reduce the brightness of the screen. If the display screen is to achieve the maximum brightness of each color in order to meet the brightness requirements, then the color balance is lost, for example: the yellow color of the two-color screen is reddish or greenish.

It is hoped that more LED display companies will be able to control the brightness within the range where human eyes are protected from harm when designing and manufacturing LED display products in the future, so that the LED display will develop better, healthier and faster.

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