Home > LED Display FAQs
1. View angle
LED display screen’s view angles depends on the view angles of its LED lamps. Basically, outdoor LED display screen with DIP has 110/55 degrees horizontally and vertically. The indoor LED display screen with SMD has 140/140 degrees. Generally using 30 ° angle of the circular LED is enough on the highway because of its special display. Some screens on the tall buildings require higher on the vertical viewing angle. Angle and brightness are contradictory. Large angle will inevitably reduce the brightness. The choice of viewing angle needs to be decided according to the specific requirement.
LED brightness is an important factor in the brightness of the LED display. The higher the LED brightness, the greater the use of current margin, to save power, maintain LED stability is good. LED has different angle values, the brightness of the chip has been set in the case, the smaller the angle, LED is brighter, but the smaller the viewing angle of the display. General should choose 100 degrees of LED to ensure that the display enough perspective. For different point spacing and different line of sight of the display, should be in the brightness, angle and price to find a balance.
3. Failure rate
As full-color LED display by the tens of thousands or even hundreds of thousands of red, green and blue LED composed of three kinds of pixels, the failure of any color LED will affect the overall visual display. In general, according to industry experience in the LED display assembly to the aging 72 hours before shipment failure rate should not be higher than three thousandths (refers to the LED lamp beads cause failure).
4. Anti-static capacity
LED is a semiconductor device, sensitive to static electricity, can easily lead to static failure, so the ability of anti-static display life is essential. In general, LED human body electrostatic mode test failure voltage should not be less than 2000V.
LED device theoretical life is of 100,000 hours, much larger than the working life of other parts of the LED display, so long as the LED device quality assurance, the appropriate current work, PCB cooling design is reasonable, rigorous display production process, LED display device will be the whole screen One of the most durable parts in the machine.
LED devices accounted for 70% of the proportion of LED display prices, so that LED devices can determine the merits of the quality of LED display. China is the production of LED devices, LED display system is made to gather. LED display high-tech requirements is the future trend of development, LED display high-quality requirements, not only on the LED display manufacturers to the direction, but also implicated in the development of LED display device manufacturers. From the LED device gatekeeper to promote China by the LED display manufacturing power to LED display manufacturing power change.
6. Attenuation characteristics
LED display for a long time after work, there will be a decline in brightness and display color inconsistencies, mainly due to LED device brightness attenuation caused. LED brightness attenuation will cause the display screen brightness reduced. Red, green and blue LED brightness attenuation range of inconsistency will cause the LED display color is inconsistent, that is, we often say that the display took the phenomenon. High-quality LED devices can be a good control of the brightness attenuation. According to 1000 hours at room temperature light 20mA standard, red attenuation should be less than 2%, blue and green attenuation should be less than 10%, so blue and green LED display design try not to use 20mA current, preferably only 70% to 80 % Of the rated current.
Attenuation characteristics In addition to the red, green and blue LED characteristics of their own, the use of current, PCB board cooling design, display ambient temperature and so on have an impact on attenuation.
LED device size affects the LED display pixel distance. The pixel pitch-3mm oval lamp is mainly used for P12.5, P12, P10 outdoor display. And 3528 SMD LED is mainly used for the P5, P6, P7.62, P8 and P10 ndoor displays. SMD 2020 LED is mainly used for P2, P3 and other indoor displays. In the premise of constant pitch, when LED device size increases, it can increase the display area and reduce the grainy, but because of the black area is reduced, it will reduce the contrast; the LED size decreases, reducing the display area, increased grainy , Black area increases, increasing the contrast.
Full-color LED display is composed of numerous red, green and blue LED pixels composed of each color LED brightness, wavelength consistency determines the consistency of the entire display brightness, white balance consistency and color consistency. In general, display manufacturers require device vendors to provide 5nm wavelength range and 1: 1.3 brightness range of the LED, these indicators can be by the device supplier to achieve through the spectral separation machine. Voltage consistency is generally not required.
As the LED has angle, so full-color LED display also has an angle of direction, that is, at different angles when viewing, its brightness is increasing or decreasing. In this way, the red, green and blue LED color angle consistency will seriously affect the consistency of different angles of white balance, a direct impact on the display screen video color fidelity. To achieve the red, green and blue LED at different angles when the consistency of the brightness changes in the matching lens design, the choice of raw materials strictly on the scientific design, depending on the level of packaging technology vendors. The normal direction of the white balance even the best display, if the angle of the LED consistency is not good, the whole screen at different angles of the white balance effect will be bad. LED lamp angle characteristics of the angle can be integrated angle tester LED measured, for the high-end display is particularly important.
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