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as the heart part of the led display screen, lamp beads have various kinds, each of which has its own unique characteristics. it is tens of millions of them that come together, together with other hardware such as the control panel, that have become the led display screen. today, let’s learn about the impact of led beads on the led display screen.
1, angle of view
the angle of the led display depends on the angle of the led beads. at present, most of the outdoor display screens use horizontal view angle of 100 degrees; vertical view angle of 50 degrees; elliptical led, indoor display screen is used horizontal and vertical 120 degrees; patch led. because of its particularity, the display screen on the highway generally chooses 30 degrees; the circular led with the viewing angle is enough. some high-rise displays require higher vertical viewing angles. angle of view and brightness are contradictory. large angle of view will inevitably reduce brightness. the choice of perspective needs to be determined according to its specific use.
2, brightness
led brightness is an important determinant of display brightness. the higher the brightness of the led, the greater the current allowance, which is good for saving power and maintaining the stability of the led. led has different angle values. when the brightness of the chip is fixed, the smaller the angle, the brighter the led, but the smaller the angle of the display screen. generally, 100 degree led should be selected to ensure that the display screen has sufficient perspective. a balance should be found in brightness, angle and price for different point spacing and different visual distance display screens.
3. failure rate
because the full-color display screen is composed of tens of thousands or hundreds of thousands of red, green and blue led pixels, the failure of any color led will affect the overall visual effect of the display screen. generally speaking, according to industry experience, the failure rate of led display should not be higher than three thousandths before 72 hours of aging. (refers to the failure of led beads due to their own causes)
4. antistatic ability
led is a semiconductor device, which is sensitive to static electricity and easily leads to static failure. therefore, the antistatic ability is very important to the life of the display screen. generally speaking, the failure voltage of human electrostatic mode test of led should not be less than 2000v.
5, life expectancy
the theoretical life of the led device is 100,000 hours, which is much longer than that of other parts of the led display. therefore, as long as the quality of the led device is guaranteed, the working current is appropriate, the pcb heat dissipation design is reasonable, and the production process of the display screen is rigorous, the led device will be one of the most durable parts in the whole display screen.
led devices account for 70% of the price of led display screen, so led devices can determine the quality of led display screen. our country is not only a big producer of led devices, but also a gathering place for the manufacture of led display screen. the high-tech requirement of led display is the future development trend. the high-quality requirement of led display is not only about the trend of led display manufacturers, but also related to the development of led display device manufacturers. from the control of led devices, we will promote the transformation of china from a big manufacturing country of led display screen to a powerful manufacturing country of led display screen.
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