An automatic detection device and detection method for dead pixels of an LED display

Abstract

The invention discloses an LED display defective pixel automatic detecting device which comprises a single chip microcomputer, a shift register, a decoder, and triodes. The I / O port of the single chip microcomputer is connected to the control end of the shift register. Each output end of the shift register is respectively connected to each row of cathode end of an LED dot matrix respectively. Each column of anode end of the LED dot matrix is in series connection with one resistor and then is connected to the triodes. Each of the triodes is connected through a grounded base circuit. The emitter of each of the triodes is connected to each input end of the decoder. The output end of the decoder is connected to the I / O port of the single chip microcomputer. Through the above mode, a defective pixel can be rapidly and accurately detected, the device and the method are suitable for the production process of an LED display screen and the field or remote online detection of an installed LED display screen, the scope of application is extremely wide, the detection efficiency is greatly improved, and the structure of the device is simple and reliable.

Description

technical field [0001] The invention relates to the field of LED screens, in particular to an automatic detection device for dead pixels of an LED display screen. Background technique [0002] In recent years, LED display screens have developed quite rapidly. Quite a few advertisers use LED display screens to push advertisements. However, there are almost no products involving LED dot matrix dead pixel scanning technology. The traditional detection method is to light up all LED screens. , and then visually detect whether there are dead pixels or not. This method is quite inconvenient. For some outdoor high-altitude advertising screens, this method is neither reliable nor safe. [0003] The published patent for automatic detection of dead pixels on LED screens is too redundant to be practical due to its complicated design. The most important thing is that the existing new LED has a protection design. After burning, the LED part can be equivalent to a resistor to protect othe...

AI Technical Summary

Problems solved by technology

[0002] In recent years, LED display screens have developed quite rapidly. Quite a few advertisers use LED display screens to push advertisements. However, there are almost no products involving LED dot matrix dead pixel scanning technology. The traditional detection method is to light up all LED screens. , and then visually detect whether there are dead pixels or not. This method is quite inconvenient. For some outdoor high-altitude advertising screens, this method is neither reliable nor safe.

[0003] The patent for automatic detection of dead pixels on LED screens has been published. Because of its complicated design, the circuit is too redundant and not practical.

The most important thing is that the existing new LED has a protection design. After burning, the LED part can be equivalent to a resistor to protect other LEDs. It is no longer possible to automatically detect dead pixels with the previous method of detecting current changes.

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