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Circuit for detecting dead pixel of LED display screen and method thereof

A technology of LED display screen and detection circuit, which is applied in the direction of measurement, static indicator, instrument, etc. using digital measurement technology, which can solve the problems of slow speed, low accuracy rate, human eye injury, etc., and achieve improved detection efficiency and simple circuit Effect

Inactive Publication Date: 2011-02-02
NANJING GENERAL ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, after a period of use of the LED display, there may also be dead pixels, which also need to be detected
The traditional detection method is manual detection, that is, the method of visual observation. This method is not only slow and accurate, but also has certain damage to human eyes. It is often impossible to detect some outdoor and high-altitude display screens.
In addition, this method cannot realize remote detection

Method used

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  • Circuit for detecting dead pixel of LED display screen and method thereof
  • Circuit for detecting dead pixel of LED display screen and method thereof
  • Circuit for detecting dead pixel of LED display screen and method thereof

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Embodiment Construction

[0025] How to implement the present invention will be specifically described below in conjunction with the accompanying drawings.

[0026] Generally speaking, an LED display, especially a large LED display, is often composed of several display units, and the pixels of a display unit can be 8×8, 16×16, 32×16, 64×48, etc.

[0027] Taking the 8×8 display unit as an example, the schematic diagram of its LED array is shown in Figure 1. If the first row is connected to the positive pole of the power supply, the others are connected to the negative pole, and the first column is connected to the negative pole, then the first light-emitting diode in the upper left corner will be on. By analogy, all LEDs can be driven.

[0028] figure 2 , image 3 It is a commonly used row drive circuit and column drive circuit.

[0029] As shown in the figure, the row power supply passes through a MOS tube, and the controller controls the switch of the MOS tube, thereby controlling the on and off ...

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Abstract

The invention relates to a circuit for detecting the dead pixel of an LED display screen and a method thereof. The circuit comprises an LED display unit, a control circuit and a drive circuit, wherein the drive circuit comprises a line drive circuit and a column drive circuit; the LED display unit consists of M*N LED(s), wherein M is more than or equal to 1, N is more than or equal to 1, and M and N are integers; the drive circuit is internally provided with a sampling resistor and an A / D converter; and the two ends of the sampling resistor are connected with the input end of the A / D converter. The working principle of the circuit comprises the steps of detecting the voltage of the circuit by the A / D converter through the sampling resistor which is arranged in the drive circuit of the LED display screen to compute the electric current which pass through each LED, and comparing the computed electric current with the normal work electric current of the LED to judge that the LED is the dead pixel when some LED electric current value is deviated from the normal work electric current. Compared with the prior art, the invention is simple and reliable in circuit, can fast and exactly find out the dead pixel, is suitable for not only the production process of the LED display screen but also the remote on-line detection of the installed and used LED display screen, and greatly improves the detection efficiency.

Description

technical field [0001] The invention relates to the technical field of LED display screens, in particular to a detection circuit and a detection method for dead pixels of LED display screens. Background technique [0002] In recent years, LED display screens have been widely used in indoor and outdoor advertising, information release and dissemination of some public information. Generally speaking, whether it is a monochrome screen or a full-color screen, it is composed of one or several LED display units, and each LED display unit is composed of M×N rectangularly arranged LEDs, where M≥1, N≥1, M , N are integers. For example, a bar display that can display 8 characters is composed of 2048 LEDs, while a large-screen LED display for outdoor use requires millions of LEDs. Such a large-scale integration will inevitably lead to dead lights (an LED is damaged or soldered) in the production process, and dead point detection has become an important task in the production process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/00G01R19/25
Inventor 陈杰丁文权
Owner NANJING GENERAL ELECTRONICS
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