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.
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.
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.
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 devices will be the entire screen One of the most durable parts of the machine.
LED devices accounted for 70% of the proportion of LED display prices, so that LED devices can determine the quality of LED display quality.
LED display after a long period of time will appear after the decline in brightness and display color inconsistencies, mainly due to the brightness of LED devices caused by attenuation. LED brightness attenuation will cause the display screen brightness reduction.
7, size
The size of the LED device affects the pixel distance of the LED display, that is, the resolution. 5mm oval lamp is mainly used for P16 above the outdoor display, 3mm oval lamp is mainly used for P12.5, P12, P10 outdoor display, 3528 SMD LED is mainly used for P6, P8 indoor display, 2020 SMD LED is mainly used for P2, P3 and other indoor display.
8, consistency
Full color display is composed of countless red, green and blue LED pixels, each color LED brightness, wavelength consistency determines the brightness of the entire display consistency, white balance consistency, consistent color Sex.