As a new type of technology terminal, light pole led screen and LED advertising machines have a wide range of demands in smart cities. Product quality is even more important, and the phenomenon of sub-charging must never happen. Let's take a look at the important indicators of the quality of light pole led screen and LED advertising machines.
Index 1: Failure rate
The light pole led screen and the LED advertising machine are composed of three basic tones of red, green and blue. Failure of any one will affect the overall visual effect of the display screen. In general, according to industry experience, the failure rate caused by the LED device itself should not be higher than three-ten thousandths before the smart LED display all-in-one machine is assembled to 72 hours before aging and shipped.
Index 2: Antistatic ability
LEDs are semiconductor devices that are sensitive to static electricity and can easily cause static electricity failure. Therefore, anti-static ability is crucial to the life of the display screen. Generally speaking, LED human body static mode test failure voltage should not be lower than 2000V.
Indicator 3: Consistency
The consistency of the brightness and wavelength of each color LED of the light pole led screen, LED advertising machine red, green and blue determines the brightness consistency, white balance consistency and chromaticity consistency of the entire display. Generally speaking, display screen manufacturers require device suppliers to provide LEDs with a wavelength range of 5 nm and a brightness range of 1: 1.3. These indicators can be achieved by device suppliers through grading and color separation. Voltage consistency is generally not required.
Index 4: Brightness
LED brightness is an important determinant of display brightness. The higher the brightness of the LED, the greater the margin of the current used, which is good for saving power and keeping the LED stable. 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 LED should be selected to ensure sufficient viewing angle of the display. For displays with different pitches and different viewing distances, a balance should be found in brightness, angle, and price.
Index 3: attenuation characteristics
Red, green, and blue LEDs all have the characteristic of brightness attenuation with the increase of working time. The pros and cons of LED chips, the quality of auxiliary materials and the level of packaging technology determine the attenuation rate of LEDs. Generally speaking, after 1000 hours, 20 mA ambient temperature lighting test, the attenuation of red LED should be less than 10%, the attenuation of blue and green LED should be less than 15%; 3. The future white balance of the LED advertising machine has a great influence, which in turn affects the display fidelity of the led display screen.