1, perspective
LED display angle depends on the LED lamp beads perspective. At present, most of the outdoor display screen selection of horizontal viewing angle of 100 °, vertical viewing angle of 50 °; oval LED, indoor display is selected horizontal and vertical are 120 °; Expressway on the display because of its special nature of the general selection of 30 °; angle of the circular LED is enough. Some high-rise display on the vertical viewing angle requirements are higher. Perspective and brightness are contradictory, a large perspective will inevitably reduce the brightness. The choice of perspective needs to be determined according to the specific purpose.
2, brightness
LED brightness is an important determinant of the brightness of the display. LED brightness is higher, the greater the use of current margin, to save power, keep the LED stability is good. LED has a different angle value, the chip brightness has been set in the case, the smaller the angle, LED is brighter, but the smaller the viewing angle of the display. Generally should choose 100 degrees LED to ensure that the display screen enough angle. For different point spacing and different line of sight of the display, should be in brightness, angle and price to find a balance point.
3, failure rate
As the full color display by tens of thousands or even hundreds of thousands of groups of red, green and blue LED composed of three pixels, any color LED failure will affect the overall visual effects of the display. In general, according to industry experience, in the LED display began to fit 72 hours before the failure of the failure rate should not be higher than three ten thousandths (referring to the LED lamp itself caused by the failure).
4, anti-static ability
LED is a semiconductor device, sensitive to static electricity, easily lead to electrostatic failure, so the anti-static capacity of the display life is essential. In general, LED body electrostatic mode test failure voltage should not be less than 2000V.
5, life expectancy
LED device theoretical life of 100,000 hours, much larger than the LED display other parts of the working life, so as long as the LED device quality assurance, working current is appropriate, PCB cooling design is reasonable, the display production process rigorous, LED device will be the entire screen One of the most durable parts of the machine.