Led display screen

Full-color LED display LED quality and special parameters can be attributed to the following five factors

Source: electronic engineering world time: the 2011-03-11 the font: big in small ?

Full-color LED display screen LED quality and special parameters can be attributed to the following five factors:

1, widely used because by tens of thousands of even hundreds of thousands of group of 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 screen display begin assembly to aging 72 hours before shipment should be no higher than the failure rate three over ten thousand (refers to the device itself LED the cause failure).

2, the LED is semiconductor devices, of electrostatic sensitive, extremely easy cause static failure, the ability to display the life span of the static electricity is very important. Generally speaking, the human body electrostatic model test LED sign failure voltage should be no less than 2000 V.

3, attenuation characteristics

Red, green, and blue  LED pane all has to work with the increase of the time and the characteristics of brightness attenuation. LED chips, auxiliary materials quality stand or fall and assembly process of level determines the decay rate of LED. Generally speaking, 1000 hours, at 20 ma light after test, red LED the attenuation should be less than 10%, blue, green LED the attenuation should be less than 15%. Red, green, and blue attenuation of full-color  LED display the consistency of the future of the white balance impact, further influence the display screen display the fidelity.

4, brightness

LED display screen brightness is an important determinant of brightness. The high brightness LED, use current headroom, the bigger the to save power consumption, maintain stable good LED. LED has a different Angle value, in the chip brightness, given the Angle of the smaller, LED the more bright, but from the point of view of the small screen is. Generally should choose the 100 degree LED to ensure that the screen enough perspective. According to different spacing and different sights display screen, should be in brightness, Angle and price strike a balance.

5, consistency

Full-color  LED screen screen is by countless 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, screen factories require device suppliers to provide five nm wavelength range and 1:1. 3 brightness range of LED, these indicators can be made by spectral color separation machine device suppliers to grade. The consistency of the voltage generally not required.

Because of the Angle is LED, so a full-color LED panel display also have a directional Angle, that in different Angle looked on, its brightness is increased or decreased. So, red, green, and 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, and blue three LED in different brightness changes when the matching of Angle consistency, need to be in packaging design, the raw material choice lens on the strict scientific design, it depends on the packaging of the supplier technical level. To the direction of white balance again good display, if the Angle of bad LED consistency, the whole screen from different point of white balance effect will be bad. LED the Angle of device available consistency characteristics LED Angle measured comprehensive test instrument, to in, high-grade LED sign display screen is especially important.