CN104821144B

CN104821144B - A kind of LED display bad point automatic detection device and its detection method

Info

Publication number: CN104821144B
Application number: CN201410787187.4A
Authority: CN
Inventors: 季翼鹏; 裴晓俊; 陈凯
Original assignee: Suzhou Vocational University
Current assignee: Suzhou Vocational University
Priority date: 2014-12-18
Filing date: 2014-12-18
Publication date: 2017-12-26
Anticipated expiration: 2034-12-18
Also published as: CN104821144A

Abstract

The invention discloses a kind of LED display bad point automatic detection device, including：Single-chip microcomputer, shift register, decoder and triode；The control terminal of the single-chip processor i/o mouth connection shift register；Each output end of the shift register connects every a line cathode terminal of LED dot matrix respectively；It is connected after LED dot matrix one resistance of each row anode tap series connection with the triode；Each triode is connected with common-base amplification circuit；Each input of each transistor emitter connection decoder；The I/O mouths of the output end connection single-chip microcomputer of the decoder.Through the above way, the present invention can quickly, be accurately detected bad point, also be adapted for the scene of mounted LED display suitable for the production process of LED display or remote online detect, the scope of application is extremely wide, detection efficiency is greatly improved, apparatus structure is simple, reliable.

Description

A kind of LED display bad point automatic detection device and its detection method

Technical field

The present invention relates to LED screen field, more particularly to a kind of LED display bad point automatic detection device.

Background technology

LED display curtain development in recent years is quite rapid, and considerable advertiser carries out advertisement using led display screens and pushed away Send, but the existing product for being related to LED dot matrix bad point scanning techniques does not almost have, and traditional detection method is only by LED screen All light, then visually detect it whether there is bad point, the method is quite inconvenient, for this method of the advertisement screen in some outdoor high-altitudes Both it is unreliable or dangerous.

The LED screen bad point automatic detection patent announced causes circuit too redundancy less due to its complicated design It is practical.Most importantly existing New LED carries design protection, and LED section can be equivalent to one piece of resistance after burning To reach the protection to other LED, bad point automatic detection can not be carried out again with the method for conventional detection curent change.

The content of the invention

The present invention solves the technical problem of providing a kind of LED display bad point automatic detection device, can quickly, Bad point is accurately detected, the live of mounted LED display also is adapted for suitable for the production process of LED display or remotely exists Line detects, and the scope of application is extremely wide, greatly improves detection efficiency, and apparatus structure is simple, reliable.

In order to solve the above technical problems, one aspect of the present invention is：There is provided a kind of LED display bad point certainly Motion detection device, including：Single-chip microcomputer, shift register, decoder and triode；The single-chip processor i/o mouth connects shift LD The control terminal of device；Each output end of the shift register connects every a line cathode terminal of LED dot matrix respectively；LED dot matrix are every It is connected after one row anode tap, one resistance of series connection with the triode；Each triode is connected with common-base amplification circuit；Each Transistor emitter connects each input of decoder；The I/O mouths of the output end connection single-chip microcomputer of the decoder.

Preferably, it is connected with minimum system on the single-chip microcomputer；The shift register is 74Hc595 shift LDs Device.

A kind of method of testing of LED display bad point automatic detection device, control centre is by communication network to single-chip microcomputer Detection instruction is sent, single-chip microcomputer controls shift register to send high level to LED dot matrix display screens cathode terminal, is sending high level Period, the often capable anode terminal voltage of decoder detection, if anode tap detects high level, that point is bad point, single-chip microcomputer note Bad point information is simultaneously dealt into control centre by record bad point position.

The beneficial effects of the invention are as follows：The present invention can quickly, be accurately detected LED display bad point, can scene or Remote online detects.

Brief description of the drawings

Fig. 1 is a kind of artificial circuit schematic diagram of LED display bad point automatic detection device of the present invention；

Fig. 2 is a kind of schematic flow sheet of the detection method of shown LED display bad point automatic detection device；

The mark of each part is as follows in accompanying drawing：1st, single-chip microcomputer；2nd, shift register；3rd, decoder；4th, triode；5、LED Dot matrix.

Embodiment

Presently preferred embodiments of the present invention is described in detail below in conjunction with the accompanying drawings, so that advantages and features of the invention energy It is easier to be readily appreciated by one skilled in the art, apparent is clearly defined so as to be made to protection scope of the present invention.

Fig. 1 and Fig. 2 are referred to, the embodiment of the present invention includes：

A kind of LED display bad point automatic detection device, including：Control centre, single-chip microcomputer 1, shift register 2, decoding Device 3 and triode 4, shift register 2 are 74Hc595 shift registers；Control centre's remote control single-chip microcomputer 1, and and monolithic Machine 1 carries out data transmission；The control terminal of the single-chip processor i/o mouth connection shift register 2；The shift register 2 it is each Output end connects every a line cathode terminal of LED dot matrix 5 respectively；The each row anode tap of LED dot matrix 5 connect after a resistance with it is described Triode 4 connects；Each triode 4 is connected with common-base amplification circuit；Each emitter stage of triode 4 connects the every of decoder 3 One input；The I/O mouths of the output end connection single-chip microcomputer 1 of the decoder 3.

Control sends detection instruction centrally through communication network to single-chip microcomputer when as shown in Figure 1 to LED4 × 4 dot matrix detection, Single-chip microcomputer controls shift register to send high level to LED dot matrix display screen first rows cathode terminal, between high period is sent, translates The anode terminal voltage that code device detection first row is often gone, if anode tap detects high level, such as the first row, then it represents that the first of LED Bad point information is simultaneously dealt into control centre by row the first behavior bad point, single-chip microcomputer record bad point position；Detect successively in aforementioned manners Secondary series LED, the 3rd row LED and the 4th row LED, until having detected all LED.

The present invention detects the presence of voltage by conveying electric current to LED cathode one by one in its anode, and this method utilizes LED's Diode characteristic, represent that this LED has been burned out or short circuit if thering is anode tap to have voltage, can support simultaneously Site Detection with it is remote Journey on-line checking, realize that the quick of bad point is accurately positioned detection.

Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hair The equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills Art field, is included within the scope of the present invention.

Claims

A kind of 1. LED display bad point automatic detection device, it is characterised in that including：Control centre, single-chip microcomputer, shift LD Device, decoder and triode；Control centre carries out data with the single-chip microcomputer by network and is connected；The single-chip processor i/o mouth connects Connect the control terminal of shift register；Each output end of the shift register connects every a line cathode terminal of LED dot matrix respectively； It is connected after LED dot matrix one resistance of each row anode tap series connection with the triode；Each triode is with common-base amplification circuit Connection；Each transistor emitter connects each input of the decoder；Described in the output end connection of the decoder The I/O mouths of single-chip microcomputer；Minimum system is connected with the single-chip microcomputer；The shift register is 74Hc595 shift registers；Control System sends detection instruction centrally through communication network to single-chip microcomputer, and single-chip microcomputer controls shift register to LED dot matrix display screens the One row cathode terminal sends high level, and between high period is sent, decoder detects the anode terminal voltage that first row is often gone, if anode End detects high level, such as N rows, then it represents that LED first row Nth row be bad point, and single-chip microcomputer records bad point position and by bad point Information is dealt into control centre；If anode tap does not detect high level, next column LED is detected；Accordingly, detect successively LED dot matrix, until detecting all LED dot matrix.