Full-color LED display screen directly associated with the user , the audience , in order to get the perfect experience , the need to control and improve the quality of LED display. So, how to control and improve the quality of LED full color display ? Reflect what a dedicated LED full color LED display is an important indicator of quality ?
First LED devices as the most critical components of full-color LED display for three reasons :
First , LED full color machine is used in the largest number of key components , each square meter will be used only a few thousand to tens of thousands of LED;
Secondly , LED optical display the entire screen is to determine the main performance , the audience directly influence the display of the evaluation ;
Again , LED display the largest proportion of the overall cost , ranging from 30% to 70 %. LED selection determines the quality of the display over 50% . If you fail to choose a good LED, no matter how good the other parts of the display screen can not make up for quality defects.
Important indicator reflecting the full-color LED display dedicated LED quality are:
First, the failure rate
As the full-color display by a group of thousands or even hundreds of thousands of red, green, and blue LED elements composed of dots , the failure of any one color LED display will affect the overall visual effect. In general , according to industry experience, beginning in the LED display fitted to the failure rate of aging 72 hours before shipment should not be higher than ten thousandths ( refers to failure LED device itself causes ) .
Second, anti-static capability
LED is a semiconductor device , sensitive to static electricity , static electricity can easily lead to failure , it is essential antistatic ability to display life. Generally speaking , LED 's body static test failure mode voltage should not fall below 2000V.
Third, consistency
Full-color display is composed of numerous red , green and blue LED composed of elements makes up each color LED brightness , wavelength determines the consistency of the entire screen brightness consistency, consistency white balance , color consistency. In general , the display device manufacturers require suppliers to provide wavelength range and brightness range of LED 5nm of 1:1.3 , these indicators can be device supplier through graded by separation achieved. Voltage consistency generally not required.
Fourth, the brightness
LED brightness is an important determinant of the display brightness . LED brightness , the greater use of current margin for saving power consumption, keep the LED stable good. LED has a different angle , the brightness has been set in the case of the chip , the smaller the angle , LED is more light, but the smaller the viewing angle of the display . General should be chosen to ensure 100 degree LED display adequate perspective. For different spacing and different sight screen , should find a balance in brightness , angle and price.
Fifth, the attenuation characteristics
Red , green and blue LED having both working time and increases the brightness of the attenuation characteristics. The pros and cons of LED chips , good or bad , and packaging technology standard auxiliary materials determines the level of the decay rate of the LED . Typically , 1000 hours , 20 mA at room temperature after the lighting test , the red LED should be less than 10% attenuation , blue , green LED attenuation should be less than 15% red, green, and blue attenuation LED full color display consistency great influence future White screen , and then display fidelity affect the display.