Full-color display special LED choice

Full-color LED display the most key components is LED devices. Three reasons: first, LED a full color is used in the machine the largest number of key components, every square metre will use only LED to thousands of tens of thousands; The second is to decide the whole screen, the led screen performance, the main body of the optical direct influence on the evaluation; the audience display Third, the led panel in the overall cost of the largest share, ranging from 30% to 70%.
Leds are the key full-color LED display device, equivalent to the computer's CPU. The choice of LED the whole screen has decided to more than 50% of the quality. If failed to choose the other parts, LED display screen again good can make up for the defect of the display quality.
Full-color LED display LED quality and special parameters can be attributed to the following five factors:
1, the failure rate
Due to widely used by hundreds of thousands of thousands of even group red, green, and blue three LED the pixel composition, the failure of any color LED all can affect whole screen visual effect. Generally speaking, according to industry experience, in the led display begin assembly to aging 72 hours before the shipment should be no higher than three hundred thousand percent failure rate refers to the device itself led causes of failure).
2, antistatic ability
Leds are semiconductor devices, of electrostatic sensitive, extremely easy cause static failure, the capacity of the life of the display screen antistatic is very important. Generally speaking, the human body electrostatic model test LED failure voltage should be no less than 2000 V.
3, attenuation characteristics
Red, green and blue leds are along with the increase of the working time of the attenuation characteristics brightness. LED chips, auxiliary materials quality the quality of the process and the package of level determines the decay rate of LED. Generally speaking, 1000 hours, 20 ma lit room temperature after test, red LED the attenuation should be less than 10%, blue, green LED the attenuation should be less than 15%. Red, green, blue attenuation of full-color LED display the consistency of the future impact, the white balance and effect of the screen shows fidelity.
4, brightness
The LED screen brightness is an important determinant of brightness. The higher the brightness leds, use current headroom to save power consumption, the greater the stability, keep the LED is good. LED has a different Angle value, in the chip set brightness, the smaller the Angle, LED the more bright, but from the point of view of the small screen is. Generally should choose 100 degrees to ensure enough LED display perspective. According to different spacing and different sights display, should be in brightness, Angle and price strike a balance.
5, consistency
Full-color display is by innumerable red, green, blue LED pixel Mosaic, each color LED the consistency of the wavelength of the light, the brightness of the screen to the consistency, and white balance consistency, chroma consistency. Generally speaking, display screen factories require device suppliers to provide five nm wavelength range and 1:1. The brightness of the range of 3, the specification can be LED by device suppliers through the spectral color separation machine to grade. The consistency of the general don't do voltage requirements.
Because of the Angle is LED, so a full-color led panel also have a view, namely in different direction Angle to watch the, its brightness is increasing or decreasing. So, red, green, blue three kinds of color LED from the point of view of the consistency will seriously affect different angles of the consistency of the white balance, the direct impact of the video screen color fidelity. To do red, green, blue three LED in different brightness changes of the match point in the packaging lens consistency, need to design, raw material selection on the strict scientific design, it depends on the encapsulation technology level. Suppliers To the direction of white balance again good display, if the point of view of the consistency is bad, LED the whole screen different point of white balance effect will be bad. LED the point of view of the device available consistency characteristics comprehensive test instrument measured LED Angle, for medium and top grade is especially important. Display