LED large screen performance index assessment 1. Antistatic ability LED is a semiconductor device, which is sensitive to static electricity and can easily cause static failure. Therefore, the antistatic ability is very important to the life of the . Generally speaking, the failure voltage of the human body electrostatic mode test of the LED should not be lower than 2000V. 2. Attenuation characteristics The brightness of the screen will decrease and the color of the display
screen will be inconsistent after a long time operation, mainly due to the brightness decay of the LED device. The attenuation of LED brightness will reduce the brightness of the entire screen of the . The inconsistency of red, green, and blue LED brightness attenuation will cause inconsistent colors, which is what we often call the phenomenon of screens. High-quality LED devices can well control the brightness attenuation range. According to the standard of 20mA lighting at room temperature for 1000 hours, red attenuation should be less than 2%, blue and green attenuation should be less than 10%, so blue and green LEDs should not use 20mA current when designing the display, preferably only 70% to 80 % Of rated current. In addition to the attenuation characteristics related to the characteristics of the red, green, and blue LEDs, the current, the heat dissipation design of the PCB board, and the ambient temperature of the screen all affect the attenuation. 3. Brightness The brightness of the lamp beads is an important determinant of the brightness of the . The higher the brightness of the LED, the greater the margin for the use of current, which is good for saving power and keeping the LED stable. LEDs have different angle values. When the brightness of the chip is fixed, the smaller the angle, the brighter the LED, but the smaller the viewing angle of the display. Generally, a 100-degree LED should be selected to ensure sufficient viewing angle of the . For LED displays with different dot pitches and different viewing distances, a balance should be found in brightness, angle, and price. 4. Viewing angle The angle of the LED lamp beads determines the viewing angle of the . At present, most outdoor LED displays use elliptical SMD LED lamp beads with a horizontal viewing angle of 120° and a vertical viewing angle of 70°. Indoor LED displays also use SMD LED lamp beads with a horizontal and vertical viewing angle of 120°. Because of its particularity, LED displays on highways generally use circular LEDs with a 30° viewing angle. Some high-rise LED displays have higher requirements for vertical viewing angles. Viewing angle and brightness are contradictory to each other, and a large viewing angle will inevitably reduce brightness. The choice of perspective needs to be determined according to the specific purpose. 5. Failure rate Since a full-color is composed of tens of thousands or even hundreds of thousands of pixels composed of three red, green and blue LEDs, the failure of any color LED will affect the overall visual effect of the . Generally speaking, according to industry experience, the failure rate of the screen from the start of assembly to aging 72 hours before shipment should be no more than three ten thousandths (referring to the failure caused by the LED lamp beads itself). 6. Consistency The full-color is composed of countless red, green, and blue LEDs. The brightness and wavelength consistency of each color LED determines the brightness consistency and white balance of the entire . Consistency and chromaticity consistency. Generally speaking, manufacturers require device suppliers to provide LEDs with a wavelength range of 5nm and a brightness range of 1:1.3. These indicators can be achieved by the device supplier through a spectroscopy machine. The consistency of voltage is generally not required. Since LEDs are angled, full-color LED displays also have angular directionality, that is, when viewed from different angles, their brightness will increase or decrease. In this way, the angle consistency of the red, green, and blue LEDs will seriously affect the consistency of the white balance at different angles, and directly affect the fidelity of the video color of the . To achieve the matching consistency of the brightness changes of the red, green, and blue LEDs at different angles, it is necessary to strictly carry out scientific design in the package lens design and raw material selection, which depends on the technical level of the package supplier. If the angle consistency of the LED is not good, the white balance effect of the whole at different angles will be bad. The angle consistency characteristics of LED lamp beads can be measured with an LED angle comprehensive tester, which is particularly important for medium and high-end LED displays. The high technical requirements of led displays are the future development trend. The high quality requirements of led displays are not only about the trend of manufacturers, but also the development of device manufacturers. From the checkpoint of LED devices, to promote China's transformation from a big country in manufacturing to a powerful country in manufacturing.
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