Solve LED display brightness is too high

LED display is more and more widely used. The development of things is always accompanied by both advantages and disadvantages. While LED displays bring good advertising effects to businesses and users, there are also some disadvantages. The high problem, the sequelae caused by the high brightness of the LED display are mainly reflected in: 1. It affects the eyesight of the citizens; 2. It affects the vision of the driver, which is easy to cause traffic accidents; 3. It affects the sleep quality of the citizens; 4. It leads to serious problems light pollution, etc.

1. Color adjustment

We all know that the LED display is displayed by the principle of three primary colors of installation light. We determine one of the three colors of red, green and blue as the benchmark is mainly based on the brightness of the selected product red, green and blue. Generally speaking, the brightness benchmark is the one with the lower brightness ratio. When one of the benchmarks has reached the maximum brightness, another color needs to be adjusted for a two-color LED display, and the other two LED colors need to be adjusted for a full-color LED display.

Let’s illustrate with an example: For example, when the LED display screen is two-color, in most cases, green shall prevail, and the working current of the red diode shall be adjusted. Generally, the working current is reduced, and the adjustment standard is to balance the color yellow, which will reduce the brightness of the entire LED display screen. The color of the LED display screen is adjusted to the best balance to reduce the brightness of the screen. Do not reach the maximum brightness of each color of the LED display, resulting in color imbalance. For example: the yellow color of a two-color screen is reddish, or greenish.

2. Adjust the brightness

1. The ordinary LED tube allows a continuous duty current of about 20 mA. By changing the current flowing through the LED, except for the saturation phenomenon of the red LED, the brightness of the other LEDs is basically proportional to the current flowing.

2. Pulse width modulation (PWM), using the frequency of change that can be felt by the human eye, and using the pulse width modulation method to achieve grayscale control, that is, to periodically change the light pulse width. Pulse width modulation is more suitable for digital control and is widely used. Using a microcomputer to provide LED indoor ultra slim display is a common method. At present, almost all LED displays use pulse width modulation to control the gray level.