Full-color LED display quality indicators

The important indicators that reflect the LED quality of full-color LED displays are: 1. Loss of efficiency Since the full-color display consists of tens or thousands of red, green, and blue LEDs, any color The failure of the LED will affect the overall visual effect of the display. In general, according to industry experience, the failure rate before the LED display starts to be assembled and 72 hours before aging should not exceed 3/10000 (refer to the failure caused by the LED device itself). Second, anti-static ability LED is a semiconductor device, sensitive to static electricity, can easily lead to static failure, so anti-static ability is critical to the life of the display. In general, the human body electrostatic model LED test failure voltage should not be less than 2000V. Third, the attenuation characteristics of red, green, and blue LEDs have the characteristics of brightness decay as the working time increases. The quality of LED chips, the quality of auxiliary materials, and the level of packaging process determine the LED decay speed. In general, after 1000 hours and 20mA normal temperature lighting test, the red LED's attenuation should be less than 10%, and the blue and green LED's attenuation should be less than 15%. The consistency of red, green, and blue attenuation is shown for full-color LED display. The white balance after the screen has a great influence, which in turn affects the display fidelity of the display. Fourth, brightness LED brightness is an important determinant of display brightness. The higher the brightness of the LED, the greater the remaining amount of current used, which is good for saving power and keeping the LED stable. The LED has different angle values. In the case that the chip brightness is fixed, the smaller the angle is, the brighter the LED is, but the smaller the viewing angle of the display screen is. Generally, 100-degree LEDs should be selected to ensure that the display has a sufficient viewing angle. For display screens with different dot pitches and different line of sight, a balance should be found in brightness, angle, and price. V. Consistency The full-color display is composed of a large number of elements consisting of red, green, and blue LEDs. The brightness and wavelength of each color LED determine the consistency of the brightness and white balance of the entire display. Sex and color consistency. In general, display manufacturers require device vendors to provide LEDs with a wavelength range of 5nm and a brightness range of 1:1.3. These specifications can be achieved by device vendors using a spectrophotometric separator. Voltage consistency is generally not required.