Full color LED display pixel is out of control? Blind spot, often highlights how to solve?

by:GKGD     2020-04-06
Full color LED display pixel is out of control is a common problem, what is the cause of this kind of imagination, how to solve? Today we are going to learn. What is the rate of pixels of pixels is out of control refers to the minimum imaging display unit ( Pixels) Work is not normal, Out of control) The proportion of. Control the number of accounts for the ratio of the total number of full screen pixels, we call it 'the whole rate of screen pixels is out of control'. In addition, in order to avoid runaway pixels focused on a particular area, we put forward 'area rate of pixels is out of control', which is 100 x 100 pixel in the area, total number of pixels and region pixels is out of control, That is, 10000) The ratio of the. The indicator on the LED display general specification SJ/T11141 - 'Out of control in 2003 pixels is a discrete distribution' request has carried on the quantitative, convenient and intuitive. Pixels of two models is a blind spot, which is a blind spot, in need of bright light, it is not called a blind spot. Second is often, when the need is dark and it has been lit, call it often highlight. Generally, pixels have 2 r1g1b ( Two red, one green and one blue light, below the same) , 1 r1g1b, 2 r1g, 3 r6g and so on. Is out of control in general is not the same pixel in the red, green, and blue lights all out of control at the same time, but as long as one lamp is out of control, we think this pixel is out of control. For the sake of simplicity, we shall each of the LED display color ( The red, green, blue) Runaway pixel statistics and calculation, respectively, to maximize the as rate of screen pixels is out of control. Full color LED display screen pixels lost? In general, common display pixels have 2 r1g1b ( Two red, one green and one blue light, below the same) And 1 r1g1b, and out of control does not generally the same pixel in the red, green, and blue lights all out of control at the same time, but as long as one lamp is out of control, we think this pixel is out of control. Therefore, can be concluded that the main cause of runaway full-color LED display pixels is LED lamp is out of control. Failure is a major cause of LED lights can be divided into two aspects: one is the LED itself poor quality; Secondly, the method of use undeserved. LED failure in LED routine inspection tests cannot be found. At high temperature, low temperature, temperature under bad conditions, such as rapid changes, due to the LED chip, epoxy resin, stents, fuses, solid crystal glue, PPA in the cup body material such as the difference of thermal expansion coefficient, cause the internal stress of different. Failure mechanism of electrostatic discharge to the LED, is very complex, equipment, tools, utensils, and the human body are possible with static and the discharge, the static electricity is less several hundred volts, high tens of thousands of volts, discharge time in nanoseconds. If there is a blue green tube failure, is usually LED to PN junction is electrostatic discharge breakdown may go. LED display due to the complex production process, electrostatic discharge small-scale operations, therefore, electrostatic protection must be through the production process. Other occasions, the actual needs of pixels is out of control rate is different, full-color LED display indicators requirements controlled within one percent. Single color LED display index requirements control within one over ten. There is no good solution full-color LED display pixels, suggest to contact your service provider, returned to the factory maintenance, if the maintenance cost is too high, can consider to change a problem of the module unit board. At present domestic LED display will be aging (before they go out Baking machine) To runaway pixel leds will repair replacement, 'rate of the whole screen pixels is out of control' control within 1/104, 'regional rate of pixels is out of control' are controlled within 3/104 is no problem, and even some individual manufacturer enterprise standards are not allowed to appear before the factory is out of control pixels, but this is bound to increase the manufacturer's maintenance cost and to extend the time of shipment. In different applications, the pixels of rate of actual requirements can have bigger difference, in general, the LED display is used for video playback, control index requirements within 1/104 is acceptable, also can achieve; If used for simple character information release, control index requirements within 12/104 is reasonable.
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