Full color LED display LED dominant - Full color LED screen - knowledge

by:Xinyao LCD     2020-04-20
Full color LED display is the most key parts of the LED device. LED full-color LED display is the key device, equivalent to a computer's CPU. LED display screen by more than 50% has decided the selection of the whole quality. If fail to choose a good LED, other parts again good also cannot make up for screen display quality defects. For three reasons: first, the LED is spoken by the largest number of the key device in the full color machine, every square metre can use only a few thousand to tens of thousands of LED; Second, the LED is to determine the main body of the whole screen optical display performance, a direct impact on the audience to display; Third, the LED display screen as a proportion of the overall cost in most, ranging from 30% to 70%. Special LED full-color LED display quality and parameters can be summed up in the following five elements: 1, the antistatic ability of LED is a semiconductor device, is sensitive to electrostatic, easily lead to static electricity failure, so the antistatic ability is very important to the life of the screen. In general, the LED pattern of human body electrostatic voltage test failure should not be less than 2000 v. 2, failure rate due to the full color LED display by tens of thousands or even hundreds of thousands of set of red, green, blue three kinds of LED pixels, any color LED display screen overall failure will affect visual result. In general, according to industry experience, at the beginning of the full-color LED display assembly to aging failure rate of 72 hours before delivery should be no more than three over ten thousand ( Refers to the LED device itself causes of failure) 。 3, attenuation characteristics of red, green, and blue leds have increased with the increase of working time intensity attenuation characteristics. Advantages and disadvantages of the LED chip, the stand or fall of auxiliary materials and packaging technology level of high and low attenuation speed determines the leds. In general, after 1000 hours, 20 ma lighting test at room temperature, red leds attenuation should be less than 10%, the attenuation of blue and green leds should be less than 15%. Red, green, and blue attenuation of the consistency of full-color LED display great influence on the white balance in the future, will affect the display fidelity of the display screen. 4, the brightness of LED brightness is an important determinant of the display brightness. LED brightness is higher, the greater the allowance of using current, is good to save electricity, stabilizing the leds. LED value has a different point of view, in the case of chip brightness is set, the smaller the Angle, the LED is more bright, but the smaller screen view. Generally should choose 100 degrees of LED display screen enough to ensure that the point of view. In view of the different spacing and different visual display, should be in brightness, Angle and find a balance on the price. 5, consistency, full-color LED display is composed of thousands of red, green and blue leds of pixels, each color LED brightness, the wavelength determines the whole screen brightness consistency, the consistency of the white balance consistency, color uniformity. In general, the manufacturer of display device vendor for 5 nm wavelength range and 1:1. 3 LED brightness range, these indicators can be made of device supplier classification through the testing machine can achieve. The consistency of the voltage generally do not require. As is the Angle of the leds, the full color LED display has the same directional Angle, namely in different angles, its luminance will be increasing or decreasing. , red, green, blue three colors LED the Angle of the consistency will seriously affect the consistency of different angles white balance, directly affect the display of video color fidelity. To be red, green, blue three kinds of LED brightness changes when matching consistency in different angles, encapsulated lens design, choice of raw materials is needed in the strict scientific design, this depends on the technical level packaging suppliers. The normal direction of the white balance again good display, if the Angle of the leds consistency is not good, the whole screen different point of view of the white balance effect will be bad. The Angle of the LED devices consistency features available LED Angle, a comprehensive test instrument to measure is particularly important for medium and top grade display screen.
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