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LEDs of LED Display

1.  Viewing Angle

The viewing angle of display depends on the the viewing angle of LED lamp. At present , when for outdoor display , we usually choose DIP LED lamp which is 100°(H)/50°(V); when for indoor display , we usually choose SMD LED lamp which is 110°(H)/110°(V). The viewing angle and brightness can’t coexist because big viewing angle will lower brightness absolutely. The choice of viewing angle depends on the concrete application.

2.  Brightness

The brightness of LED lamp is an important factor to display’s brightness. The higher brightness of LED, the more remain of current, which is beneficial to power saving and keep LED stable. LED has different viewing angle value, under the certain circumstance of LED’s brightness, the smaller viewing angle, the brighter LED lamp. So the recommended LED lamp’s viewing angle is 100°to ensure enough viewing angle of display.

3. Failure Rate

Due to full color LED display is consist of tens of thousands or even hundreds of thousands of led lamps, which is consist of red, green and blue LED chip, the failure of any color of LED chip will influence the overall visual performance. In general, the failure rate before shipment not more than five over ten thousand.

4. Anti-static Ability

Due to LED is semiconductor device, which is sensitive to static and cause failure once incurred static, thus anti-static ability is vital for the lifespan of display.

5. Lifespan

Theoretically, the lifespan of LED device is 100,000 hours, which largely exceed the lifespan of others’ devices in the display. If we can guarantee the LED device in excellent quality, suitable working current, reasonable PCB thermal dissipation design, strict production workmanship, LED device will be one of the most durable devices in the display.

6. Degradation Feature

When display works for a long time, it will have the brightness degradation phenomenon. The brightness degradation of LED will lower the brightness of overall display. What’s more, the brightness degradation range nonconformity of RGB will cause color nonconformity of LED display. The LED devices in superior quality control bright degradation range nicely.

7. LED Device Size

On the basis of certain pixel pitch, the increased LED device size, which can increase the showing square meter and decrease granular sensation, but it will lower contrast and vice versa.

8. Consistency

Full color display consists of countless LED lamps which contains RGB LED chip. The consistency of brightness, white balance and chromaticity depends on the consistency of brightness of each color in LED and wave length.

Due to LED has viewing angle, thus display has angle orientation feature similarly, to put it simply, the brightness will have progressive increase or decrease when viewing at different angle. In this way, the angle consistency of RGB LED chip will influence the consistency of white balance at different angle seriously, which will affect the chromatic fidelity directly.

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