1. Angle of view
The angle of LED display is decided by the angle of LED lamp bead. At present, the outdoor display screen mostly chooses the horizontal angle of view 100°; vertical angle 50°, the ellipse led, the indoor display selects the horizontal vertical all is the 120°; the SMD LED. Because of its particularity, the display screen of the expressway is usually 30°; the round LED is enough. The screens on some tall buildings require higher vertical viewing angles. The angle of view and brightness are contradictory, the big angle of view must reduce brightness. The choice of perspective needs to be determined by specific uses.
2, brightness
Led brightness is an important determinant of the brightness of the display. The higher the LED brightness, the greater the use of current, to save power consumption, maintain led stability is good. LED has different angle values, in the case of the chip brightness has been fixed, the angle is smaller, LED is brighter, but the display angle is smaller. Generally, the 100-degree led should be selected to ensure sufficient viewing angle of the display. For different point spacing and different visual range of the display, should be in brightness, angle and price to find a balance point.
3, failure efficiency
Because the Full-color display by tens of thousands or even hundreds of thousands of sets of red, green, blue Three kinds of LED pixel components, any color LED failure will affect the overall visual effect of the display. Generally speaking, according to industry experience, the failure rate should not be higher than three out of 10,000 before the LED display starts assembling to the aging 72-hour shipment (refers to the failure caused by the LED lamp bead itself).
4. Antistatic ability
LED is a semiconductor device, electrostatic sensitive, very easy to lead to electrostatic failure, so the antistatic ability of the screen life is critical. In general, the LED human electrostatic mode test failure voltage should not be less than 2000V.
5. Life expectancy
LED devices have a theoretical life of 100,000 hours, far greater than the LED display other parts of the working life, so long as the quality of the LED devices, the appropriate work current, PCB thermal design reasonable, display production process rigorous, LED devices will be the display of the most durable parts of the machine.
LED devices accounted for 70% of the price of LED display, so that led devices can determine the quality of LED display. China is the production of LED devices, but also led display system to do the gathering place. LED display of High-tech requirements is the future development trend, LED display high-quality requirements, not only on LED display manufacturers, but also implicated in LED display screen device manufacturers development. From the LED device to promote China from LED display manufacturing power to the LED display of the transformation of power.