1. perspective: the perspective of the led display depends on the perspective 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 led 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 should not be higher than three-thousandths before the led display starts to assemble and aging 72 hours before shipment (refers to the failure caused by the led beads themselves).