What are the important indicators that affect the quality of full-color LED displays?

First of all, lamps?are the most critical components of full-color LED displays. The?reasons?are as follow:

1. lamps?are?the key component used in the largest number of full-color screens, and thousands to tens of thousands of lamps?will be used per square meter;

2. lamp?is the main body that determines the performance of the display, which directly affects the audience's evaluation;

3. lamp?accounts the largest proportion of the overall cost of the display, ranging from 30% to 70%. The choice of?lamp?determines more than 50% of the quality of the display. If you fail to choose a good?lamp, no matter how good the other components of the display screen are, it cannot make up quality of?display screen.

The important indicators that reflect the quality of lamps?dedicated to full-color LED displays are:

1. 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 lamps, 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 be less?than 3/10,000 (referring to the failure caused by the LED device itself).

2. Antistatic ability

Lamp?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 human body electrostatic mode test should not be lower than 2000V.

3. Attenuation characteristics

Red, green and blue lamps 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 LED?lamps. Generally speaking, after 1000 hours, 20 mA lighting test at room temperature, the attenuation of red LED?lamps?should be less than 10%, and the attenuation of blue and green LED lamps should be less than 15%. The consistency of red, green and blue attenuation is for full-color LED display.?The white balance of the screen in the future has a great impact, which in turn affects the fidelity of the display.

4. Brightness

Brightness is an important determinant of displays. The higher the brightness of the LED?lamps, the greater the margin of the current used, which is good for saving power consumption and keeping the LED stable. LED?lamps?have different angle values. When the brightness of the chip is fixed, the smaller the angle, 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. Consistency

The full-color display screen is composed of numerous picture elements composed of red, green, and blue LED?lamps. The consistency of the brightness and wavelength of each color LED ?lamp determines the brightness consistency, white balance consistency, and chromaticity of the entire display screen. consistency. Generally speaking, display manufacturers require device suppliers to provide LED?lamps?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.