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Viewing angle
The viewing angle of the LED display depends on the viewing angle of LED lamp. At present, most of the outdoor display screens use 100 ° horizontal viewing angle, with 50 ° vertical viewing angle, and the indoor display screens use 120 ° horizontal and vertical patch LED. Because of its particularity, the display screen on the highway usually chooses 30 °; the round led with the visual angle is enough. Some high-rise display screens require a high vertical viewing angle. The angle of view and brightness are contradictory to each other. A large viewing angle will inevitably reduce brightness. The choice of perspective needs to be determined according to the specific purpose.
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Brightness
LED lamp brightness is an important determinant of display brightness. The higher the brightness of LED is, the larger the margin of using current is, which is good for saving power consumption and keeping led stable. LED has different angle values. When the brightness of the chip is set, the smaller the angle, the brighter the LED, but the smaller the viewing angle of the display. Generally, 100 degrees led shall be selected to ensure a sufficient viewing angle of display screens. For display screens with different pixel pitch and viewing distance, we should find a balance in brightness, angle, and price.
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Failure rate
As the full-color display consists of tens of thousands or even hundreds of thousands of groups of red, green and blue LED pixels, the failure of any color LED will affect the overall visual effect of the display. Generally speaking, according to industry experience, the failure rate of LED display screens from assembly to 72 hours of aging test before shipment should not be higher than 3 / 100
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Antistatic capacity
LED lamp is a semiconductor device, sensitive to static electricity, which is very easy to cause static electricity failure, so the anti-static ability is very important for the life of the display screen. Generally speaking, the failure voltage of LED in the human static mode test shall not be lower than 2000V.
