Full color LED display is the most critical component of LED lamp beads. There are three reasons:
First, LED is the full color screen machine used in the largest number of key devices, each square meter will use thousands to tens of thousands of LED;
Second, LED is the main decision to determine the performance of the main screen, a direct impact on the audience's evaluation of the display;
Third, LED in the overall cost of the largest proportion of the display, ranging from 30% to 70%.
How to identify the advantages and disadvantages of LED display lamp beads
First, look at solder joints. Formal LED lights with manufacturers of LED lights with the use of SMT chip technology, with solder paste and reflow process production
Second, look at the quality of FPC. FPC is divided into copper and copper two kinds of copper, copper clad copper is protruding, look at the words from the pad and FPC to see the connection
Third, look at the LED light with the surface cleanliness. If the use of SMT production process LED lights, the surface cleanliness is very good, do not see any impurities and stains
Fourth, look at the LED lights with the chip and the production process, with the eyes can not see the difference, to use aging equipment and testing equipment If you put several manufacturers of LED on the aging device with high current aging 24 hours or longer Time, you go to measure the brightness of several manufacturers of LED, see that led light intensity attenuation minimum, the smallest attenuation that the best quality.
LED lamp beads on the impact of LED display which
LED display angle depends on the LED lamp beads perspective. At present, most of the outdoor display screen selection of horizontal viewing angle of 100 °, vertical viewing angle of 50 °; oval LED, indoor display is selected horizontal and vertical are 120 °; Expressway on the display because of its special nature of the general selection of 30 °; angle of the circular LED is enough. Some high-rise display on the vertical viewing angle requirements are higher. Perspective and brightness are contradictory, a large perspective will inevitably reduce the brightness. The choice of perspective needs to be determined according to the specific purpose.
LED brightness is an important determinant of the brightness of the display. LED brightness is higher, the greater the use of current margin, to save power, keep the LED stability is good. LED has a different angle value, the chip brightness has been set in the case, the smaller the angle, LED is brighter, but the smaller the viewing angle of the display. Generally should choose 100 degrees LED to ensure that the display screen enough angle. For a different point spacing and different line of sight of the display, should be in brightness, angle and price to find a balance point.
3, failure rate
As the full color display by tens of thousands or even hundreds of thousands of groups of red, green and blue LED composed of three pixels, any color LED failure will affect the overall visual effects of the display. In general, according to industry experience, in the LED display began to fit 72 hours before the failure of the failure rate should not be higher than three thousandths (referring to the LED lamp itself caused by the failure).
4, anti-static ability
LED is a semiconductor device, sensitive to static electricity, easily lead to electrostatic failure, so the anti-static capacity of the display life is essential. In general, LED body electrostatic mode test failure voltage should not be less than 2000V.
5, life expectancy
LED device theoretical life of 100,000 hours, much larger than the LED display other parts of the working life, so as long as the LED device quality assurance, working current is appropriate, PCB cooling design is reasonable, the display production process rigorous, LED devices will be the entire screen One of the most durable parts of the machine.
LED devices accounted for 70% of the proportion of LED display prices, so that LED devices can determine the quality of LED display quality. China is the production of LED devices power, but also to do the LED display system to gather. LED display of high-tech requirements is the future development trend, LED display high-quality requirements, not only on the LED display manufacturers to the trend, 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 the LED display manufacturing power change.
6, attenuation characteristics
LED display after a long period of time will appear after the decline in brightness and display color inconsistencies, mainly due to the brightness of LED devices caused by attenuation. LED brightness attenuation will cause the display screen brightness reduction. Red, green, blue LED brightness attenuation of the inconsistency will cause the LED display color is inconsistent, that is, we often said that the display screen to spend the phenomenon. High-quality LED devices can well control the brightness attenuation. According to 1000 hours at room temperature lit 20mA standard, red attenuation should be less than 2%, blue, green attenuation should be less than 10%, so blue, green LED design in the display as far as possible not to use 20mA current, preferably only 70% to 80 % Of the rated current.
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