Constant expansion of the application of LED display azimuth, users know play the effect of conventional complanation, advertising has been completely submerged in the information age, the pursuit of novelty, personality, customization, such as spherical LED screen, LED cube, the body of revolution, the flexible screen and other creative LED display arises at the historic moment, these unique in appearance, playback diverse LED display is eye-catching, advertising benefit maximization.
Users of different requirements, make LED display product diversification, so to the LED display enterprise research and development, design, production are put forward higher requirements, and full color LED display screen display effect is directly associated with the user, the audience, in order to get perfect experience, the need to control and improve the quality of the LED display. So, how to control and improve the quality of full color LED display screen? Reflect the special full-color LED display, LED one of the important indices for quality have?
1) LED device as a full-color LED display of the most key components, for three reasons:
First of all, 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;
2) The LED is to determine the main body of the whole screen optical display performance, directly affect the audience to display;
Again, the LED display screen as a proportion of the overall cost in most, ranged from 30% ~ 70%. LED the whole choose to display more than 50% of the quality. If fail to choose a good LED, display other parts again good also cannot make up for the defect of the display quality.
Affect the quality of special LED full-color LED display are important indicators mainly include:
1) the failure rate
With full-color displays by tens of thousands or even hundreds of thousands of set of red, green, blue three kinds of LED point of primitives, any color LED display screen overall failure will affect visual result. Generally speaking, according to industry experience, at the beginning of the LED display assembly to aging failure rate of 72 hours before delivery should be no more than three over ten thousand (LED device itself causes of failure).
2) the antistatic ability
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.
3) consistency,
Full-color display screen is composed of thousands of red, green and blue leds of primitives, 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. The 3 LED brightness range, these indicators can be made of classification through the testing machine can achieve device supplier. The consistency of the voltage generally do not require.
4) brightness
LED brightness is one of the important determinants of 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) the attenuation characteristics
Red, green and blue leds have increased with the increase of working time intensity attenuation characteristics. The pros and cons of the LED chip, the stand or fall of auxiliary materials and the quality of packaging craft level determines the attenuation velocity of leds. Generally speaking, after 1000 hours, 20 milliampere light test at room temperature, the attenuation of the red LED should be less than 10%, the attenuation of blue and green leds should be less than 15%. The consistency of red, green, and blue attenuation of full color LED display has great influence on the white balance in the future, will affect the display fidelity of the display screen.
Understand the above several key indicators affecting the full-color LED display, LED manufacturer, you can purchase from light-emitting diodes (leds), circuit board manufacturing process, assembly process specification, production workshop anti-static processing, etc, to control and improve the quality of the products, make enterprises in an impregnable position in the fierce competition.
