CN107316597A - A kind of liquid crystal display module open circuit short circuit detecting system - Google Patents
A kind of liquid crystal display module open circuit short circuit detecting system Download PDFInfo
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- CN107316597A CN107316597A CN201710687233.7A CN201710687233A CN107316597A CN 107316597 A CN107316597 A CN 107316597A CN 201710687233 A CN201710687233 A CN 201710687233A CN 107316597 A CN107316597 A CN 107316597A
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- mcu
- liquid crystal
- crystal display
- circuit
- display module
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal Display Device Control (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The present invention discloses a kind of liquid crystal display module open circuit short circuit detecting system, including：MCU, the register being electrically connected with the MCU, the current detection circuit being electrically connected with the MCU, the auxiliary circuit being electrically connected with the current detection circuit and the acoustic-optic alarm being electrically connected with the MCU, the current detection circuit is used for the size for detecting the electric current for flowing through the auxiliary circuit, and the MCU sends detection signal to the register and clock signal, the data to current detection circuit are handled and started acoustic-optic alarm.Automatic detection liquid crystal display module of the present invention, instead of method originally by manually detecting, substantially increases detection efficiency, and the False Rate detected is low, than manually detecting more reliable, reduces the fraction defective of product.
Description
Technical field
The present invention relates to liquid crystal display module field, more particularly to a kind of liquid crystal display module open circuit short circuit detecting system.
Background technology
Liquid crystal display module is exactly briefly to shield+backlight, and the principle of liquid crystal display is that back light unit is sent uniformly
Face light, light passed to by liquid crystal display in our eyes, and the effect of screen is that these light are handled by pixel, to show figure
Picture.It has the features such as thin saving space of fuselage, power saving, Low emissivity, picture are soft not to hinder, in each building block of mobile phone
In, liquid crystal display module occupies an important position.Some pins are carried on liquid crystal display module, in production and processing, it is necessary to examine
Survey whether these pins open a way or short circuit, it is to avoid upper electricity is damaged to product under product short-circuit conditions, while can also intercept this
Badness product.Detection liquid crystal display module open circuit or the method for short circuit are detected by naked eyes or using amplification sem observation at present,
Such a mode efficiency is low, and loss is high, and easily makes the eye fatigue of staff using visual inspection, is unfavorable for eyes
Health.
Therefore, the prior art is defective, it is necessary to improve.
The content of the invention
The purpose of the present invention is to overcome the deficiencies in the prior art there is provided a kind of liquid crystal display module open circuit short-circuit detecting system
System, improves the efficiency of detection.
Technical scheme is as follows：A kind of liquid crystal display module open circuit short circuit detecting system, including：MCU, with it is described
Register that MCU is electrically connected with, the current detection circuit with MCU electric connections, electrically connect with the current detection circuit
The auxiliary circuit connect and the acoustic-optic alarm being electrically connected with the MCU.The current detection circuit is flowed through for detection
The size of the electric current of the auxiliary circuit, the MCU sends detection signal and clock signal to register, to current detecting electricity
The data on road are handled and started acoustic-optic alarm, when tested module open circuit, short circuit or these three normal situations,
The current value that auxiliary circuit is produced is different.
The register is 8 SI PO shift registers, and it includes 8 pins, and the register mainly sends out MCU
The serial data gone out is converted to parallel data, and the parallel data is sequentially output by 8 pins.
Each pin of auxiliary circuit correspondence liquid crystal display module to be measured is provided with a triode, if liquid crystal display module
Tested pin it is normal (i.e. without open circuit or short circuit), then the corresponding triode of the pin is open-minded, if be tested pin and open a way,
Then the corresponding triode of the pin is not open-minded, if tested pin short circuit occurs with adjacent leads, two pins corresponding three
Pole pipe can be simultaneously open-minded.
The acoustic-optic alarm include audible alarm unit and displaying alarm, when tested liquid crystal display module just
Chang Shi, the acoustic-optic alarm does not send alarm, and when tested liquid crystal display module is opened a way, audible alarm unit sounds simultaneously
And displaying alarm shows " open " printed words and the positional information opened a way occurs, when short circuit occurs in tested liquid crystal display module
When, audible alarm unit sounds and displaying alarm shows " short " printed words and the positional information of short circuit occurs.
Using such scheme, the present invention is used to detect whether each pin of liquid crystal display module to occur opening a way or short-circuit existing
As liquid crystal display module to be detected being electrically connected with register and auxiliary circuit respectively, MCU sends detecting letter to register
Number, register sends a signal to module to be measured immediately, is tested module open circuit, short circuit or normal these three situation auxiliary circuits production
Raw current value is different, the current value that current detection circuit detection auxiliary circuit is produced, and MCU is by the current value and standard electric
Flow valuve compares, and if there is open circuit or short-circuit conditions, then can deviate standard current value, and then MCU drives acoustic-optic alarm
Alarm.Automatic detection liquid crystal display module of the present invention, instead of method originally by manually detecting, substantially increases detection efficiency,
And the False Rate detected is low, than manually detecting more reliable, reduces the fraction defective of product.
Brief description of the drawings
Fig. 1 is system framework figure of the invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Referring to Fig. 1, the present invention provides a kind of liquid crystal display module open circuit short circuit detecting system, including：MCU, with it is described
Register that MCU is electrically connected with, the current detection circuit with MCU electric connections, electrically connect with the current detection circuit
The auxiliary circuit connect and the acoustic-optic alarm being electrically connected with the MCU.Auxiliary circuit correspondence liquid crystal display to be measured
Each pin of module is provided with a triode, when tested module open circuit, short circuit or these three normal situations, auxiliary circuit production
Raw current value is different, and the current detection circuit is used for the size for detecting the electric current for flowing through the auxiliary circuit, described
MCU sends detection signal to register and clock signal, the data to current detection circuit are handled and started acousto-optic
Warning device.
The register is 8 SI PO shift registers, and it includes 8 pins, and respectively D0 to D7, this is posted
The MCU serial datas sent are mainly converted to parallel data by storage, and the parallel data is defeated successively by 8 pins
Go out, register can save MCU I/O port resource.
The acoustic-optic alarm include audible alarm unit and displaying alarm, when tested liquid crystal display module just
Chang Shi, the acoustic-optic alarm does not send alarm, and when tested liquid crystal display module is opened a way, audible alarm unit sounds simultaneously
And displaying alarm shows " open " printed words and the positional information opened a way occurs, when short circuit occurs in tested liquid crystal display module
When, audible alarm unit sounds and displaying alarm shows " short " printed words and the positional information of short circuit occurs.
The system detects that its operation principle is as follows one by one to each pin for being tested module：After system energization, MCU
The detection signal of a high level is sent to register, then a clock signal is sent to register again, in this clock signal
Rising edge, register can be by the detection signal received from MCU by DO outputs, because the detection signal is high level, then DO
Position output high level.
When this pin of tested module normal (no open circuit or short circuit), this high level signal can then make in auxiliary circuit
The corresponding triode of the pin is open-minded, and the electric current for now flowing through resistance in auxiliary circuit can be by institute's voltage supplied and resistance
Calculate, the current value detected is sent to MCU by current detection circuit, MCU is by the current value surveyed and the standard of setting
Value compares, and the current value is in the range of standard value, then MCU does not start acoustic-optic alarm.
When this pin of tested module is opened a way, this high level detection signal will not make the pin in auxiliary circuit
Corresponding triode is open-minded, then auxiliary circuit is in open-circuit condition, and not having in the resistance of auxiliary circuit electric current to flow through, (current value is
Zero), MCU is by after current value and standard value contrast, and driving audible alarm unit sends alarm and drives displaying alarm to show
" open and " printed words and there is the positional information opened a way.
When with adjacent pin short circuit occurs for this pin of tested module, two pins corresponding three in auxiliary circuit
Pole pipe can simultaneously it is open-minded, the resistance of other elements can diminish in auxiliary circuit, then flowing through the electric current of resistance can become big, MCU by this
Current value is with after standard value contrast, driving audible alarm unit to send alarm and drive displaying alarm to show " short " word
Sample and the positional information for short circuit occur.
After the completion of first pin test of tested module, MCU sends a low level detecting to register again to be believed
Number, a clock signal then is sent to register again, in the rising edge of this clock signal, D1, register can export one
The level (high level) of D0 output during clock signal, DO can export the low level detection signal newly received from MCU, D1
The next bit pin of the tested module of correspondence detection, a Cleaning Principle ibid pin, by that analogy, if the pin of module to be measured
Excessively, register and auxiliary circuit can be increased.
In summary, the present invention is used to detect whether each pin of liquid crystal display module occurs opening a way or short circuit phenomenon,
Liquid crystal display module to be detected is electrically connected with register and auxiliary circuit respectively, MCU sends detection signal to register,
Register sends a signal to module to be measured immediately, is tested module open circuit, short circuit or these three normal situation auxiliary circuits and produces
Current value it is different, the current value that current detection circuit detection auxiliary circuit is produced, MCU is by the current value and normalized current
Value compares, and if there is open circuit or short-circuit conditions, then can deviate standard current value, and then MCU drives acoustic-optic alarm report
It is alert.Automatic detection liquid crystal display module of the present invention, instead of method originally by manually detecting, substantially increases detection efficiency, and
And the False Rate of detection is low, than manually detecting more reliable, reduces the fraction defective of product.
These are only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Any modifications, equivalent substitutions and improvements made within principle etc., should be included in the scope of the protection.
Claims (4)
- The short circuit detecting system 1. a kind of liquid crystal display module is opened a way, it is characterised in that including：The MCU and MCU is electrically connected with Register, with the MCU be electrically connected with current detection circuit, with the current detection circuit be electrically connected with auxiliary circuit And the acoustic-optic alarm being electrically connected with the MCU, the current detection circuit flows through the auxiliary circuit for detection Electric current size, the MCU sends detection signal and clock signal, the data to current detection circuit to the register Handled and start acoustic-optic alarm.
- The short circuit detecting system 2. liquid crystal display module according to claim 1 is opened a way, it is characterised in that the register is 8 SI PO shift registers, it includes 8 pins, and the register is mainly converted to the MCU serial datas sent simultaneously Row data, and the parallel data is sequentially output by 8 pins.
- The short circuit detecting system 3. liquid crystal display module according to claim 1 is opened a way, it is characterised in that the auxiliary circuit Each pin of correspondence liquid crystal display module to be measured is provided with a triode.
- The short circuit detecting system 4. liquid crystal display module according to claim 1 is opened a way, it is characterised in that the sound and light alarm Device includes audible alarm unit and displaying alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710687233.7A CN107316597B (en) | 2017-08-11 | 2017-08-11 | Open circuit and short circuit detection system of liquid crystal display module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710687233.7A CN107316597B (en) | 2017-08-11 | 2017-08-11 | Open circuit and short circuit detection system of liquid crystal display module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107316597A true CN107316597A (en) | 2017-11-03 |
| CN107316597B CN107316597B (en) | 2020-11-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710687233.7A Active CN107316597B (en) | 2017-08-11 | 2017-08-11 | Open circuit and short circuit detection system of liquid crystal display module |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108510923A (en) * | 2018-03-30 | 2018-09-07 | 武汉精立电子技术有限公司 | A kind of detection liquid crystal module ID pins open the device of short circuit |
| CN110780230A (en) * | 2019-11-26 | 2020-02-11 | 广东晟合技术有限公司 | IC module open circuit or short circuit detection device and detection method |
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| US5073754A (en) * | 1990-07-24 | 1991-12-17 | Photon Dynamics, Inc. | Method and apparatus for testing LCD panel array using a magnetic field sensor |
| CN201331640Y (en) * | 2008-08-29 | 2009-10-21 | 比亚迪股份有限公司 | Short circuit detection circuit for liquid crystal module |
| CN201936581U (en) * | 2010-11-24 | 2011-08-17 | 康惠（惠州）半导体有限公司 | Display screen testing device |
| CN202996239U (en) * | 2012-12-07 | 2013-06-12 | 华南理工大学 | LED dot matrix module defect detection device |
| CN104282281A (en) * | 2014-10-20 | 2015-01-14 | 深圳市华星光电技术有限公司 | LED backlight drive circuit and fault detection method thereof |
| CN205049834U (en) * | 2015-06-05 | 2016-02-24 | 苏州工业园区海的机电科技有限公司 | Hot plug LCD screen circuit |
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2017
- 2017-08-11 CN CN201710687233.7A patent/CN107316597B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5073754A (en) * | 1990-07-24 | 1991-12-17 | Photon Dynamics, Inc. | Method and apparatus for testing LCD panel array using a magnetic field sensor |
| CN201331640Y (en) * | 2008-08-29 | 2009-10-21 | 比亚迪股份有限公司 | Short circuit detection circuit for liquid crystal module |
| CN201936581U (en) * | 2010-11-24 | 2011-08-17 | 康惠（惠州）半导体有限公司 | Display screen testing device |
| CN202996239U (en) * | 2012-12-07 | 2013-06-12 | 华南理工大学 | LED dot matrix module defect detection device |
| CN104282281A (en) * | 2014-10-20 | 2015-01-14 | 深圳市华星光电技术有限公司 | LED backlight drive circuit and fault detection method thereof |
| CN205049834U (en) * | 2015-06-05 | 2016-02-24 | 苏州工业园区海的机电科技有限公司 | Hot plug LCD screen circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108510923A (en) * | 2018-03-30 | 2018-09-07 | 武汉精立电子技术有限公司 | A kind of detection liquid crystal module ID pins open the device of short circuit |
| CN110780230A (en) * | 2019-11-26 | 2020-02-11 | 广东晟合技术有限公司 | IC module open circuit or short circuit detection device and detection method |
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| Publication number | Publication date |
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| CN107316597B (en) | 2020-11-13 |
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