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Several factors affecting the quality of full-color LED display

by:Toponetech     2021-04-27
Abstract: Generally speaking, according to industry experience, the failure rate of LED displays from the start of assembly to 72 hours before aging should be no more than three out of ten thousand. 1. Failure rate Since a full-color display screen is composed of tens of thousands or even hundreds of thousands of pixels composed of three 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 between the start of assembly of the touch display and the 72-hour aging before shipment should be no more than three ten thousandths (referring to the failure of the LED device itself). 2. Antistatic ability LED is a semiconductor device, which is sensitive to static electricity and can easily cause static failure. Therefore, antistatic ability is very important to the life of the display screen. Generally speaking, the failure voltage of the human body electrostatic mode test of the LED should not be lower than 2000V. 3. Attenuation characteristics: Red, green, and blue LEDs all have the characteristics 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 attenuation speed of the LED. Generally speaking, after 1000 hours, 20 mA normal temperature lighting test, the attenuation of the red LED should be less than 10%, and the attenuation of the blue and green LEDs should be less than 15%. The uniformity of red, green, and blue attenuation will have a great impact on the white balance of the full-color LED display in the future, 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 for the use of current, which is good for saving power 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 screen. For displays with different dot pitches and different viewing distances, a balance should be found in brightness, angle, and price. 5. Consistency The full-color display is composed of countless red, green, and blue LEDs. The brightness and wavelength consistency of each color LED determines the brightness consistency and white balance consistency of the entire display. , Chromaticity consistency. Generally speaking, display screen 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 the device supplier through the classification of the light-separation machine. The consistency of voltage is generally not required. Since LEDs are angled, full-color LED displays also have angular directionality, that is, when viewed from different angles, their brightness will increase or decrease. In this way, the angle consistency of the red, green, and blue LEDs will seriously affect the consistency of the white balance at different angles, and directly affect the fidelity of the video color of the display screen. 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 package lens design and raw material selection, which depends on the technical level of the package supplier. No matter how good the normal direction white balance is, if the LED angle consistency is not good, the white balance effect of the whole screen at different angles will be bad. The angle consistency characteristics of LED devices can be measured with an LED angle comprehensive tester, which is especially important for medium and high-end display screens. [LED electronic display] [LED unit board] [LED display manufacturer]
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