CN107799042B - Liquid crystal display module test board - Google Patents
Liquid crystal display module test board Download PDFInfo
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- CN107799042B CN107799042B CN201711066419.7A CN201711066419A CN107799042B CN 107799042 B CN107799042 B CN 107799042B CN 201711066419 A CN201711066419 A CN 201711066419A CN 107799042 B CN107799042 B CN 107799042B
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
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- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
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Abstract
The invention discloses a liquid crystal display module test board, comprising: MCU, man-machine exchange circuit, voltage bias circuit, first auxiliary circuit, second auxiliary circuit, video display control circuit and anchor clamps, MCU and man-machine exchange circuit, voltage bias circuit, first auxiliary circuit, anchor clamps, video display control circuit are connected, voltage bias circuit still with first auxiliary circuit and anchor clamps connection, first auxiliary circuit still with anchor clamps connection, video display control circuit still with anchor clamps and second auxiliary circuit connection. The invention provides a liquid crystal display module test board which can be used for testing liquid crystal display modules with different interfaces, changes the situation that only one interface can be tested by a single traditional test board, has strong flexibility, reduces the production quantity of the test boards and saves the cost. During testing, a worker only needs to place the liquid crystal display module to be tested at a specific position on the test board and presses the switch key to test, and the operation is very convenient.
Description
Technical Field
The invention relates to the field of liquid crystal display modules, in particular to a liquid crystal display module test board.
Background
With the development of science and technology, electronic products are widely used in daily life of people, such as mobile phones, computers, tablets and the like. The liquid crystal display module is used as an important component of an electronic product, and the quality of the performance of the liquid crystal display module greatly determines the quality of the electronic product and the experience of a user, so that the liquid crystal display module generally needs to be subjected to a large number of tests before leaving a factory, the test contents comprise whether a screen can normally rotate, a screen light and dark test, a Gamma value test and other attributes, and the liquid crystal display module can be put into the market after the test is qualified and the effect is good. The testing of the liquid crystal display module is generally performed by the testing board, the interface on the liquid crystal display module has an MCU interface, an LVDS interface, an RGB interface, etc., different interfaces are provided on different liquid crystal display modules, different interfaces need different testing boards to be driven, which is very troublesome and wastes cost.
Accordingly, the prior art is deficient and needs improvement.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a liquid crystal display module test board which can adapt to various interfaces on a liquid crystal display module.
The technical scheme of the invention is as follows: a test board for liquid crystal display module is provided, which comprises: MCU, man-machine exchange circuit, voltage bias circuit, first auxiliary circuit, second auxiliary circuit, video display control circuit and anchor clamps, anchor clamps are used for placing the liquid crystal display module assembly that awaits measuring. The MCU is connected with the man-machine exchange circuit, the voltage bias circuit, the first auxiliary circuit, the clamp and the video display control circuit, the voltage bias circuit is further connected with the first auxiliary circuit and the clamp, the first auxiliary circuit is further connected with the clamp, and the video display control circuit is further connected with the clamp and the second auxiliary circuit.
Further, the first auxiliary circuit includes: the device comprises a first burning circuit, a DC-DC conversion circuit, a Gamma correction circuit, a first storage circuit, a functional pin detection circuit and a backlight control circuit, wherein the first storage circuit is used for storing programs in the MCU. Because there is no Gamma correction circuit in some LCD module, the test board provides Gamma circuit. The backlight control circuit is used for controlling the liquid crystal display module to be tested and the backlight source in the test board.
Further, the pin function detection circuit includes: the device comprises an up-down rotation detection module, a left-right rotation detection module, a CABC (content Adaptive Brightness control) detection module and an ID (identification) detection module, wherein the up-down rotation detection module is used for detecting whether the up-down rotation function of a screen is normal or not, if the up-down rotation detection module inputs a high level, the liquid crystal display module to be detected is set to be in forward scanning, if a figure image is displayed, the head of the figure faces upwards and the feet of the figure face downwards, correspondingly, the up-down rotation detection module inputs a low level, the liquid crystal display module to be detected is set to be in reverse scanning, if the figure image is displayed, the head of the figure faces downwards and the feet of the figure face upwards, and whether the up-down rotation function of the screen is normal or not is detected through forward scanning and reverse. The left-right rotation detection module is used for detecting whether the left-right rotation function of the screen is normal or not, the CABA detection module is used for detecting whether the display of the backlight module is normal or not, namely whether the liquid crystal display module can automatically adjust the backlight brightness according to the displayed content or not, and the ID detection module is used for reading the ID number of the liquid crystal display module and judging whether the ID number is correct or not.
Further, the second auxiliary circuit includes: the second recording circuit, the second storage circuit, the VGA interface circuit and the composite video interface circuit, wherein the second storage circuit is used for storing the program of the video display control circuit.
Furthermore, the voltage bias circuit comprises a manual voltage bias circuit and an automatic voltage bias circuit, and the manual voltage bias circuit or the automatic voltage bias circuit can be selected according to self requirements.
Further, the man-machine switching circuit comprises: keyboard control circuit, display interface circuit and audible alarm circuit.
By adopting the scheme, the liquid crystal display module test board provided by the invention can be used for testing liquid crystal display modules with different interfaces, the situation that only one interface can be tested by a single traditional test board is changed, the flexibility is strong, the production quantity of the test boards is reduced, and the cost is saved. During testing, a worker only needs to put the liquid crystal display module to be tested on the clamp on the test board and presses the switch key to test, and the operation is very convenient.
Drawings
FIG. 1 is a block diagram of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
Referring to fig. 1, the present invention provides a test board for a liquid crystal display module, including: MCU, man-machine exchange circuit, voltage bias circuit, first auxiliary circuit, second auxiliary circuit, video display control circuit and anchor clamps, anchor clamps are used for placing the liquid crystal display module assembly that awaits measuring. The MCU is connected with the man-machine exchange circuit, the voltage bias circuit, the first auxiliary circuit, the clamp and the video display control circuit, the voltage bias circuit is further connected with the first auxiliary circuit and the clamp, the voltage bias circuit comprises a manual voltage bias circuit and an automatic voltage bias circuit, and the manual voltage bias circuit or the automatic voltage bias circuit can be selected according to self requirements. The first auxiliary circuit is further connected with the clamp, and the video display control circuit is further connected with the clamp and the second auxiliary circuit.
The first auxiliary circuit includes: the test board comprises a first burning circuit, a DC-DC conversion circuit, a Gamma correction circuit, a first storage circuit, a functional pin detection circuit and a backlight control circuit, wherein the first storage circuit is used for storing programs in the MCU. The backlight control circuit is used for controlling the liquid crystal display module to be tested and the backlight source in the test board. The functional pin detection circuit includes: rotation detection module about, rotation detection module, CABC detection module and ID detection module about, rotation detection module is used for detecting the upper and lower rotation function of screen whether normal from top to bottom, rotation detection module input high level from top to bottom, then the liquid crystal display module that awaits measuring is set up to forward scanning, if show the personage image, then the personage head is foot down up, correspondingly, rotation detection module input low level from top to bottom, then the liquid crystal display module that awaits measuring is set up to the reverse scanning, if show the personage image, then the personage head is foot down up, whether normal from top to bottom rotation function through forward scanning and reverse scanning detection screen. The left-right rotation detection module is used for detecting whether the left-right rotation function of the screen is normal or not, the CABA detection module is used for detecting whether the display of the backlight module is normal or not, namely whether the liquid crystal display module can automatically adjust the backlight brightness according to the displayed content or not, and the ID detection module is used for reading the ID number of the liquid crystal display module and judging whether the ID number is correct or not.
The second auxiliary circuit includes: the second recording circuit, the second storage circuit, the VGA interface circuit and the composite video interface circuit, wherein the second storage circuit is used for storing the program of the video display control circuit.
The man-machine switching circuit comprises: keyboard control circuit, display interface circuit and audible alarm circuit.
The working principle of the invention is as follows: firstly, corresponding codes and pictures are burned into corresponding Flash through a first burning circuit and a second burning circuit, and an interface of a liquid crystal display module to be tested and a functional pin to be tested are selected by utilizing a keyboard control circuit and a display interface circuit in a man-machine exchange circuit.
If the selected interface of the liquid crystal display module is an LVDS interface, the voltage bias circuit is firstly utilized to set the bias voltage, the manual voltage bias circuit or the automatic voltage bias circuit can be selected according to the self requirement, and the voltage bias circuit provides voltage for the liquid crystal module to be tested. After the setting is finished, the liquid crystal display module to be tested is inserted into a clamp on the test board, the corresponding key voltage bias circuit is clicked to start outputting the corresponding voltage for the liquid crystal module to be tested, the video display control circuit starts outputting LVDS signals to enter a test mode, and in the test process, if the tested functional pins are abnormal, sound and light alarm can be carried out. And after the test is finished, clicking the key, cutting off the power supply and the signal, and finishing the test.
If the selected interface of the liquid crystal display module is an MCU interface, a data bit (8/9/16/18bit) corresponding to the MCU interface is set first, and then the required voltage is selected. After the setting is finished, the liquid crystal display module to be tested is inserted into a clamp on the test board, corresponding keys are clicked, the DC-DC conversion circuit starts to output corresponding voltage for the liquid crystal display module to be tested, the MCU starts to output MCU signals to enter a test mode, and in the test process, if the tested functional pins are abnormal, sound and light alarm can be carried out. And after the test is finished, clicking the key, cutting off the power supply and the signal, and finishing the test.
In addition, the test board for the liquid crystal display module can be expanded to have a display function similar to that of a PC (personal computer), and only a host is required to be connected with a VGA (video graphics array) interface circuit or a composite video interface circuit reserved on the test board.
In summary, the invention provides a test board for testing a liquid crystal display module, which can be used for testing liquid crystal display modules with different interfaces, thereby changing the situation that only one interface can be tested by a single traditional test board, having strong flexibility, reducing the production quantity of the test boards and saving the cost. During testing, a worker only needs to place the liquid crystal display module to be tested at a specific position on the test board and presses the switch key to test, and the operation is very convenient.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A kind of liquid crystal display module assembly test board, characterized by, including: the device comprises an MCU, a man-machine exchange circuit, a voltage bias circuit, a first auxiliary circuit, a second auxiliary circuit, a video display control circuit and a clamp, wherein the MCU is connected with the man-machine exchange circuit, the voltage bias circuit, the first auxiliary circuit, the clamp and the video display control circuit;
the first auxiliary circuit includes: the device comprises a first burning circuit, a DC-DC conversion circuit, a Gamma correction circuit, a first storage circuit, a functional pin detection circuit and a backlight control circuit;
the functional pin detection circuit includes: the device comprises an up-down rotation detection module, a left-right rotation detection module, a CABC detection module and an ID detection module;
the second auxiliary circuit includes: the second burning circuit, the second storage circuit, the VGA interface circuit and the composite video interface circuit;
the first storage circuit is used for storing programs in the MCU, and the second storage circuit is used for storing programs of the video display control circuit;
if the selected interface of the liquid crystal display module is an LVDS interface, firstly setting a bias voltage by using a voltage bias circuit, and providing the voltage for the liquid crystal module to be tested by using the voltage bias circuit; after the setting is finished, inserting the liquid crystal display module to be tested into a clamp on the test board, clicking a corresponding key, enabling the voltage bias circuit to start outputting corresponding voltage to the liquid crystal module to be tested, and enabling the video display control circuit to start outputting LVDS signals to enter a test mode;
if the selected interface of the liquid crystal display module is an MCU interface, setting a data bit corresponding to the MCU interface, and then selecting the required voltage; after the setting is finished, the liquid crystal display module to be tested is inserted into the clamp on the test board, the corresponding key is clicked, the DC-DC conversion circuit starts to output corresponding voltage to the liquid crystal display module to be tested, and the MCU starts to output MCU signals to enter a test mode.
2. The test board for LCD modules as claimed in claim 1, wherein the voltage bias circuit comprises a manual voltage bias circuit or an automatic voltage bias circuit.
3. The test board for LCD modules as claimed in claim 1, wherein the HUM circuit comprises: keyboard control circuit, display interface circuit and audible alarm circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711066419.7A CN107799042B (en) | 2017-11-02 | 2017-11-02 | Liquid crystal display module test board |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711066419.7A CN107799042B (en) | 2017-11-02 | 2017-11-02 | Liquid crystal display module test board |
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| CN107799042A CN107799042A (en) | 2018-03-13 |
| CN107799042B true CN107799042B (en) | 2021-04-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109461395A (en) * | 2018-11-07 | 2019-03-12 | 中国电子科技集团公司第二十八研究所 | A kind of display facility information hand-held analyzer and application method |
| CN110412782B (en) * | 2019-08-02 | 2023-08-04 | 湖南海诚宇信信息技术有限公司 | Liquid crystal display device testing system and testing method |
| CN114490477B (en) * | 2022-01-28 | 2024-05-14 | 重庆惠科金扬科技有限公司 | Interface switching circuit, method, liquid crystal display screen and storage medium |
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| CN106652864A (en) * | 2017-03-08 | 2017-05-10 | 深圳市帝晶光电科技有限公司 | Visual liquid crystal display operation system |
| CN106710494A (en) * | 2016-12-23 | 2017-05-24 | 武汉精立电子技术有限公司 | Display module detection system and detection method |
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| KR20100136148A (en) * | 2009-06-18 | 2010-12-28 | 주식회사 디지트론 | Test system and method for testing display module |
| CN103105684B (en) * | 2013-01-22 | 2015-09-16 | 北京京东方光电科技有限公司 | LCD MODULE method of testing, device, system and testing apparatus |
| CN203616547U (en) * | 2013-12-19 | 2014-05-28 | Tcl显示科技（惠州）有限公司 | Test system of liquid crystal display module |
| CN204904796U (en) * | 2015-07-22 | 2015-12-23 | 深圳市亮晶晶电子有限公司 | Multifunctional LCM test board |
| CN107240370A (en) * | 2017-08-02 | 2017-10-10 | 长沙市宇顺显示技术有限公司 | A kind of display screen test device and method of testing |
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Patent Citations (3)
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| CN104698607A (en) * | 2013-12-06 | 2015-06-10 | 大连龙宁科技有限公司 | LCM test system with function of voice prompt |
| CN106710494A (en) * | 2016-12-23 | 2017-05-24 | 武汉精立电子技术有限公司 | Display module detection system and detection method |
| CN106652864A (en) * | 2017-03-08 | 2017-05-10 | 深圳市帝晶光电科技有限公司 | Visual liquid crystal display operation system |
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