LEDs are the most used key components in the full-color screen, and thousands to tens of thousands of LEDs are used per square meter; secondly, LEDs are the main body that determines the performance of the entire screen's optical display, which directly affects the audience's evaluation of the display; again , There are five indicators that determine LED quality: brightness and viewing angle, uniformity and clarity, pixel runaway rate, life, energy consumption and energy efficiency. [Full-color LED display] is composed of a column of light-emitting diodes, so the quality of the LED directly affects the overall quality of the display. If you fail to choose a good LED, no matter how good the other components of the display screen are, it cannot make up for the defects of the display screen quality.

[Full-color LED display] The important indicators of special LED quality are:

1. Attenuation characteristics

Red, green and blue LEDs all have the characteristic of brightness decay with the increase of working time. The quality of LED chips, the quality of auxiliary materials and the level of packaging technology determine the decay speed of LEDs. Generally speaking, after 1000 hours, 20 mA lighting test at room temperature, the attenuation of red LED should be less than 10%, and the attenuation of blue and green LED should be less than 15%. Display screen] The white balance in the future has a great influence, which in turn affects the display fidelity of the display screen.

2. Consistency

[Full-color LED display] is composed of numerous red, green and blue LEDs. The consistency of the brightness and wavelength of each color LED determines the brightness consistency and white balance consistency of the entire display. , chromaticity consistency. Generally speaking, display manufacturers require device suppliers to provide LEDs with a wavelength range of 5nm and a brightness range of 1:1.3. These indicators can be achieved by device suppliers through grading through a spectrophotometer. The consistency of voltage is generally not required.

3. Failure rate

Since the full-color display is composed of tens of thousands or even hundreds of thousands of pixel points composed of three types of red, green and blue LEDs, the failure of any color LED will affect the overall visual effect of the display. Generally speaking, according to industry experience, the failure rate from the start of assembly to aging 72 hours before shipment should not be higher than 3/10,000 (referring to the failure caused by the LED device itself).

4. Brightness

LED brightness is an important determinant of display brightness. The higher the brightness of the LED, the greater the margin of the current used, which is good for saving power consumption and keeping the LED stable. LEDs have different angle values. When the brightness of the chip is fixed, the smaller the angle, the brighter the LED, but the smaller the viewing angle of the display. Generally, a 100-degree LED should be selected to ensure a sufficient viewing angle of the display. For displays with different dot pitches and different viewing distances, a balance point should be found in brightness, angle and price.

5. Antistatic ability

LED is a semiconductor device, which is sensitive to static electricity and can easily lead to static electricity failure. Therefore, the anti-static ability is very important to the life of the display screen. Generally speaking, the failure voltage of LED human body electrostatic mode test should not be lower than 2000V.

In a word, device manufacturing and device application itself are a complementary unity. The progress of device technology brings prosperity to the application market, and the demand of the application market is the eternal driving force for the progress of device technology. Let our upstream and downstream enterprises work together to create a new future for LED display technology.