LED dead pixel processing method and LED display control method

Abstract

The invention relates to a method for processing LED dead pixels and an LED display control method. Wherein, the LED dead point processing method includes the steps of: controlling a plurality of LED light points in the LED display module to output specified grayscale values ​​to display the detection picture; analyzing and processing the photographed pictures obtained by shooting the detection picture to determine the The position of the LED dead point; and the position of the determined LED dead point is transmitted to the display control system electrically connected with the LED display module, so that the LED pixel point corresponding to the LED dead point is located by the display control system when processing video image data The gray value of the image data is set to zero, and then the processed video image data is used to drive and control the LED display module for display. The present invention does not need to manually repair the module where the dead point is located, and can greatly reduce the maintenance cost and the operation difficulty of the bad point repairing process under the premise of ensuring the display effect.

Description

technical field [0001] The invention relates to the technical field of LED display, in particular to a method for processing LED dead pixels and a method for controlling LED display. Background technique [0002] With the improvement of LED manufacturing technology and LED display technology, large-size LED display screens are widely used. Some crowded places such as cultural squares, station streets, hotel shopping malls, etc. use LED display screens for outdoor advertising display; mainly used for broadcasting Some of their own discount promotional advertisements, or advertisements placed by other customers, are used to collect some advertising fees. In foreign countries, the application market of LED display is also very wide. During the use of these displays, as the use time increases, the LED light points age, and the solder joints fall off, sparse LED dead pixels will appear. [0003] Due to the characteristics of LED display control, it usually causes the lights nea...

AI Technical Summary

Problems solved by technology

However, if LED1 has a dead pixel due to aging or light point falling off, when the control circuit controls to light up LED1, at this time in the control chip, because the IN terminal is logic 0, the OUT1 terminal is also logic 0, and because LED1 actually has no It emits light, so the current flowing through LED1 is 0, VA is not pulled up to VDD2-Vf, it is still logic 0, and at this time the voltage VE, VF at E, F is uncontrollable, if any voltage of VE, VF The difference between the voltage of OUT1 and OUT1 is greater than Vf, which will cause LED2 or LED3 to emit light. At this time, the luminous intensity (that is, the gray value) of LED2 and LED3 is controlled by the gray value of the light point LED1. Compared with the light point LED2, LED3 originally There will be a difference in the luminous intensity of the , which is called an abnormality of on and off

[0005] The traditional methods of dealing with dead pixels include: a). Soften the lamp panel where the dead pixels are located by hot air blowing, remove the dead LED pixels and replace them with good ones. Although this method can repair the dead pixels, the operation It is very troublesome and time-consuming. At the same time, if the operation is not careful, it may increase the workload; b). Replace the lamp board (module) where the LED dead point is located. The final lamp panel is not from the same batch as other lamp panels, which will destroy the brightness and chromaticity uniformity of the display screen, so it is necessary to re-calibrate the brightness and chromaticity of the display screen; c). Without processing, let the LED dead pixels adjacent Abnormal light on and off

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