Five Quality Parameters Affecting LED Full Color Display > 자유게시판

1. Failure rate

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

2. Antistatic ability

LED semiconductor devices are sensitive to static electricity and can easily cause static failure. Therefore, the antistatic ability is very important to the life of the display. Generally speaking, the failure voltage of LED human body electrostatic mode test should not be lower than 2000V

3. Attenuation characteristics

Red, green, and blue LEDs all have the characteristic of brightness attenuation as the working time increases. The quality of LED chips, the quality of auxiliary materials and the level of packaging technology determine the LED decay speed. Generally speaking, after 1000 hours, 20 mA room temperature lighting test, the attenuation of red 100mm Foldable LED Mesh Curtain should be less than 10%, and the attenuation of blue and green LED should be less than 15%. Balance has a big impact, which in turn affects the display fidelity of the display.

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 maintaining the stability of the LED. 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 for 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 countless red, green, and blue LEDs. The consistency of the brightness and wavelength of each color LED determines the brightness consistency, white balance consistency, and chromaticity consistency of the entire display screen. Generally speaking, display manufacturers require device suppliers to provide LEDs with 5nm wavelength range and brightness range. These indicators can be graded by device suppliers through spectrophotometers to achieve voltage consistency. Generally, there is no requirement.

Because the LED has an angle, the full-color LED display also has angle directionality, that is, when viewed at different angles, its brightness will increase or decrease. In this way, the angle consistency of the red, green, and blue LEDs will seriously affect the different angles. The consistency of the angle white balance directly affects the fidelity of the display video color. To achieve the matching consistency of the brightness changes of the red, green and blue LEDs at different angles, it is necessary to strictly carry out scientific design in the packaging lens design and raw material selection, which depends on the technical level of the packaging supplier. No matter how good the white balance in the normal direction is, if the LED angle consistency is not good, the white balance effect of the whole screen at different angles will be poor. The angle consistency characteristics of the LED device can be measured by the LED angle comprehensive tester. High-end displays are especially important.