What Factors Determine The Quality Of Outdoor Advertising LED Display?

The quality and parameters of LEDs for outdoor advertising LED displays can be summarized into the following five factors.

Consistency

The full-color display consists of numerous red, green and blue LED pixels. The brightness and wavelength consistency of each color LED determines the brightness consistency, white balance consistency and chromaticity consistency of the entire display. Generally, display manufacturers require equipment suppliers to provide LEDs with a wavelength range of 5nm and a brightness range of 1:1.3, which can be graded by the equipment supplier using a spectrophotometer. Voltage consistency is generally not required.

Failure rate

Since the full-color display is composed of tens of thousands or even hundreds of thousands of red, green, and blue LED pixels, the failure of any one color LED will affect the overall visual effect of the display. Generally speaking, according to industry experience, the failure rate should not be higher than 3/10000 (referring to the failure caused by the LED device itself).

Brightness

LED brightness is an important factor in determining the brightness of a display. The higher the brightness of the LED, the greater the current margin, which is conducive to energy saving and maintaining the stability of the LED. LEDs have different angle values. When the chip brightness is fixed, the smaller the angle, the brighter the LED, but the smaller the viewing angle of the display. Generally, 100-degree LEDs are used to ensure that the display has sufficient viewing angles. For displays with different dot pitch and viewing distance, we should find a balance between brightness, angle and price.

Antistatic ability

Outdoor advertising LED is a semiconductor device, which is very sensitive to static electricity, which can easily lead to static electricity failure. Therefore, the antistatic performance of the display screen is very important to the service life of the display screen. Generally speaking, the fault voltage of LED should not be lower than 2000V.

Attenuation characteristics

With the increase of working time, the red, green and blue LEDs all have the characteristics of brightness attenuation. The decay rate of LED depends on the quality of LED chips, the quality of auxiliary materials and the level of packaging technology. Generally speaking, after 1000 hours of 20 mA room temperature lighting test, the attenuation of red LED should be less than 10%, and the attenuation of blue and green LED should be less than 15%. The consistency of red, green and blue attenuation will have a great impact on the white balance of the future full-color LED display, which in turn will affect the fidelity of the display.

Since outdoor advertising LEDs are angled, the full-color LED display also has angular directionality, that is, its brightness will increase or decrease when viewed from different angles. In this way, the angle consistency of red, green, and blue LEDs will seriously affect the consistency of white balance at different angles, and directly affect the fidelity of video color on the display. In order to match the brightness changes of red, green and blue LEDs at different angles, it is necessary to carry out strict scientific design of packaging lens design and raw material selection according to the technical level of packaging suppliers. If the angle consistency of the LEDs is not good, the white balance effect of different angles of the entire screen will be poor. The LED angle tester can measure the angle consistency characteristics of LED devices, which is especially important for mid-to-high-end displays.

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