LED display is composed of numerous LED display lamp, LED display lamp directly determine the quality of the LED display, LED display which parameters are determined by the LED display lamp?
1, Viewing Angle
The viewing angle of the LED display is determined by the viewing angle of the LED lamp beads. At present, most of the outdoor display screens use the horizontal viewing angle of 100°; the vertical viewing angle of 50°; the elliptical LEDs, and the indoor display screens use the horizontal and vertical 120° LED patches. The display on the highway is generally 30° due to its particularity; circular LEDs of viewing angle are sufficient. Some high-rise displays require a higher vertical viewing angle. The viewing angle and brightness are mutually contradictory, and a large viewing angle will inevitably reduce the brightness. The choice of perspective needs to be determined based on the specific use.
LED brightness is an important determinant of display brightness. The higher the brightness of the LED, the greater the remaining amount of current used, which is good for saving power and keeping the LED stable. The LED has different angle values. In the case that the chip brightness is fixed, the smaller the angle is, the brighter the LED is, but the smaller the viewing angle of the display screen is. Generally, 100-degree LEDs should be selected to ensure that the display has a sufficient viewing angle. For display screens with different dot spacing and different line of sight, a balance should be found in brightness, angle, and price.
3, failure rate
Since a full-color display consists of tens or hundreds of thousands of pixels consisting of red, green and blue LEDs, the failure of any color LED will affect the overall visual effect of the display. In general, according to industry experience, the failure rate before the LED display starts to assemble and 72 hours before aging should not exceed 30% (refer to the failure caused by the LED lamp itself).
4, anti-static ability
LED is a semiconductor device, which is sensitive to static electricity and can easily cause static electricity failure. Therefore, anti-static ability is very important for the life of the display. In general, the human body electrostatic model test LED failure voltage should not be less than 2000V.
The theoretical life of the LED device is 100,000 hours, which is far greater than the working life of other components of the LED display. Therefore, as long as the quality of the LED device is guaranteed, the operating current is appropriate, the PCB thermal design is reasonable, and the display screen production process is rigorous, the LED device will be the entire display screen. One of the most durable parts in the machine.
LED devices account for 70% of the price of LED displays, so LED devices can determine the quality of LED displays. China is a big producer of LED devices and a gathering place for led display screens. LED display high-tech requirements is the future development trend, LED display high-quality requirements, not only about the direction of LED display manufacturers, but also implicated the development of LED display device manufacturers. From the LED device checks, promote China from the LED display manufacturing countries to LED display manufacturing power.
6, attenuation characteristics
After the LED display works for a long time, there will be a phenomenon that the brightness is decreased and the display color is inconsistent, which is mainly caused by the brightness attenuation of the LED device. Attenuation of the LED brightness will cause the display screen to have reduced brightness. The inconsistency of the brightness attenuation of red, green, and blue LEDs can cause inconsistencies in the color of the LED display, which is what we often say about the display. High-quality LED devices can well control the brightness attenuation. According to 1000 hours normal temperature light 20mA standard, red attenuation should be less than 2%, blue, green attenuation should be less than 10%, so blue, green LED display screen design do not try to use 20mA current, it is best to use only 70% to 80 % of rated current.
In addition to the attenuation characteristics of red, green, and blue LEDs, the use of current, PCB board thermal design, and the ambient temperature of the display panel all affect attenuation.
The size of the LED device affects the pixel distance of the LED display, ie the resolution. The 5mm elliptical lamp is mainly used for outdoor display of P16 and above. The 3mm elliptical lamp is mainly used for outdoor display of P12.5, P12, and P10. The 3528 type of patch LED is mainly used for indoor display of P6 and P8. 2020 SMD LED is mainly used for P2, P3 indoor display. Under the premise of constant dot pitch, the LED device increases in size, which can increase the display area and reduce the graininess. However, since the area of the black area is reduced, the contrast is reduced; on the contrary, the LED size is reduced, the display area is reduced, and the graininess is increased. The area of the black area increases, increasing the contrast.
The full-color display is composed of numerous pixels composed of red, green and blue LEDs. The consistency of the brightness and wavelength of each color LED determines the consistency of the brightness of the entire display, the white balance is consistent, and the color is uniform. Sex. In general, display manufacturers require device vendors to provide LEDs with a wavelength range of 5nm and a brightness range of 1:1.3. These specifications can be achieved by device vendors using a spectrophotometric separator. Voltage consistency is generally not required.
Since the LEDs are angled, the full-color LED display also has angular directionality, that is, its brightness increases or decreases when viewed at different angles. In this way, the consistency of the angles 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 display screen. To achieve consistent matching of brightness changes of red, green, and blue LEDs at different angles, it is necessary to strictly design the package lens design and raw material selection, depending on the packaging vendor's technical level. The display with even white balance in the normal direction, if the LED's angle is not well aligned, the white balance effect of the entire screen at different angles will be bad. The LED lamp bead's angle consistency characteristics can be measured with an LED angle integrated tester, which is particularly important for medium and high-end displays.
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