Pixel out of control
Pixel out of control is the proportion of the minimum imaging unit (pixel) of the display that is not working properly (out of control). And the pixels out of control there are two modes: one blind spot, that is, blind spots, when the need to light it is not bright, called blind spots; the second is often bright spots, when it is not bright, it has been lit, Called a bright spot. In general, the composition of the pixels are 2R1G1B (2 red, 1 green and 1 blue), 1R1G1B, 2R1G, 3R6G, etc., and out of control is generally not the same pixel in the red, Green, blue lights at the same time all out of control, but as long as one of the lights out of control, we think that this pixel out of control. For the sake of simplicity, we press the LED display of the primary colors (ie, red, green, blue) were out of control pixel statistics and calculation, whichever is the maximum value of the display as the pixel out of control rate.
Out of control the number of pixels accounted for the proportion of the total number of pixels, we call it "the whole screen pixel out of control rate." In addition, in order to avoid out of control pixels concentrated in a certain region, we propose a "regional pixel out of control rate", that is, in the 100 × 100 pixel area, the number of pixels out of control and the total number of pixels (ie 10000) ratio. This indicator on the "LED display general specification" SJ / T11141-2003 "out of control pixels are discrete distribution" requirements were quantified, convenient and intuitive.
The domestic LED display will be in the factory before the aging (baking machine), out of control pixel LED lights will be replaced, "the whole screen pixel out of control rate" control within 1/104, "regional pixel out of control" 3/104 is no problem, and even some individual manufacturers of enterprise standards require the factory does not allow out of control pixels, but this is bound to increase the manufacturer's manufacturing and maintenance costs and extend the shipping time. In different applications, the actual requirements of the pixel out of control can be a big difference, in general, LED display for video playback, the target requirements within the control of 1/10 is acceptable, but also can be achieved; If it is used for simple character information release, the index requirement is controlled within 12/104 is reasonable