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LED diode's eight aspects for LED display
1, viewing angle
LED display depends on the viewing angle LED lamp beads perspective. Currently most use outdoor display horizontal viewing angle 100 ° ;, vertical viewing angle 50 °; oval LED, indoor displays the selected horizontal and vertical are 120 °; SMD LED. Display on the highway because of its particularity is generally used 30 °; viewing angle circular LED enough. Some high-rise on the display for vertical viewing angle higher. Perspective and brightness mutually contradictory perspective is bound to reduce the brightness large. Select the desired viewing angle, depending on the use to decide.
2, brightness
LED brightness is an important determinant of display brightness. LED brightness higher, the greater use of the current balance of power saving, LED maintaining good stability. LED has a different angle, the brightness has been set in the chip case, the smaller the angle, the more LED lights, but the smaller viewing angle of the display. General should be chosen to ensure 100-degree LED display sufficient perspective. Different for different point spacing and line of sight of the display, you should find a balance in brightness, angle and prices.
3, loss of efficiency
Since the full-color display by the tens of thousands or even hundreds of thousands of groups of red, green, and blue LED pixels composed of dots, the failure of any color LED display will affect the overall visual effect. In general, according to industry experience in LED display will begin to assemble the failure rate of aging 72 hours before shipment should be no higher than ten thousandths (of a failure of the LED lamp itself causes).
4, anti-static capability
LED is a semiconductor device, sensitive to static electricity, static electricity can easily lead to failure, so the antistatic ability is critical to the life of the display. Generally speaking, LED body static mode test failure voltage of not less than 2000V.
5, life
Theoretical life of LED devices for 100,000 hours, LED display is much larger than the working life of other components, so long as the LED device quality assurance, appropriate operating current, PCB thermal design reasonable, strict production process display, LED display device will be whole one of the most durable machine parts.
LED devices accounted for 70% LED display prices in proportion, so that the LED device can determine the quality of the merits of the LED display. That country is the largest producer of LED devices, LED display also making gathering. Technically demanding LED display is the future trend of development, LED display high quality requirements, not only with regard to the trend of LED display manufacturers, LED display screen is also implicated in the development of the device manufacturers. From the LED device checks to promote the transformation of China from a manufacturing to a manufacturing power LED display LED display power.
6, the attenuation characteristic
LED display will appear after working long hours brightness decline and display color inconsistencies, mainly due to the brightness of the LED devices attenuation caused. LED brightness decay will cause the entire display screen brightness is reduced. Red, green and blue LED brightness decay magnitude of inconsistency will cause the LED display color inconsistencies, that is, we often say that the phenomenon of flower display. High quality LED device can be well controlled brightness decay magnitude. By 1000 hours at room temperature 20mA standard lighting, red attenuation should be less than 2%, blue, green decay should be less than 10%, so blue, so as not to be used 20mA current green LED in the display design, it is best to use only 70% to 80 % of the rated current.
In addition to the attenuation characteristics of red, green, blue LED characteristics associated itself, the use of electric current, PCB board thermal design, the display using ambient temperature etc. affect attenuation.
7, size
LED device the size of the impact of the LED display pixel distance, or a resolution. 5mm oval lamp is mainly used for more than P16 outdoor display, 3mm oval lamp is mainly used for P12.5, P12, P10 outdoor display, 3528 SMD LED is mainly used for P6, P8 of the households within the display, 2020 SMD LED is mainly used for P2, P3 and other indoor display. Under the premise of constant spacing, LED device size increases, to increase the display area to reduce the grainy, but by reducing the black area will decrease the contrast; the contrary, LED size decreases, reducing the display area, grainy increased , the black area is increased, increasing the contrast.
8, consistency
Full-color display is composed of numerous pixels of red, green and blue LED component makes up each color LED brightness, wavelength determines the consistency of the entire screen brightness uniformity, white balance, consistency, chromaticity consistency sex. Generally, display devices require manufacturers and suppliers to provide a wavelength range of 1 5nm: 1.3 brightness range of LED, these indicators can be component suppliers were graded by machine to achieve spectral separation. Voltage consistency generally not required.
Since the LED is angled, so the full-color LED display also has a directional angle, that when viewed at different angles, its brightness is incremented or decremented. Thus, the red, green and blue LED's perspective of consistency would seriously affect the consistency of different angles, white balance, directly affecting the display of video color fidelity. To do the red, green and blue LED brightness variations at different angles to match the consistency, we need to package the lens design, selection of raw materials on strict scientific design, depending on package vendor technology. Even the best white balance method to monitor the direction, if the LED angle consistency is not good, the entire screen at different angles balance effect will be bad. LED lamp Angle Consistency feature is available LED Tester angle measured for the high-end display is particularly important.
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