CN102928675A - Method for detecting shielding layer of capacitive touch screen - Google Patents

Method for detecting shielding layer of capacitive touch screen Download PDF

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Publication number
CN102928675A
CN102928675A CN2012104677337A CN201210467733A CN102928675A CN 102928675 A CN102928675 A CN 102928675A CN 2012104677337 A CN2012104677337 A CN 2012104677337A CN 201210467733 A CN201210467733 A CN 201210467733A CN 102928675 A CN102928675 A CN 102928675A
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Prior art keywords
screen
touch
functional test
measured
fpc
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CN2012104677337A
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CN102928675B (en
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武林
李冬
刘新科
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Zhonghuan Hi-Tech Co Ltd Tianjin City
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Zhonghuan Hi-Tech Co Ltd Tianjin City
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Abstract

The invention relates to a method for detecting a shielding layer of a capacitive touch screen. By use of a test computer with capacitive touch screen test software, a functional test board and a functional test adapter board, an FPC (Flexible Printed Circuit) shielding pin is simulated by a conductive material, so that the test of the shielding layer of a to-be-detected touch screen is achieved; the functional test board comprises a singlechip; the functional test adapter board is made of a bi-layer printed circuit board and used for line adaption; the functional test board is connected with the test computer by a USB (Universal Serial Bus) data line; the functional test board is connected with the functional test adapter board by a flat cable; the functional test adapter board is connected with the FPC of the to-be-detected touch screen by a ZIF (Zero Insertion Force) or BTB (Board To Board) connector; and the functional test adapter board is connected with the conductive material for simulating the FPC shielding pin by a flexible cable. The shielding pin of the flexible printed circuit board is stimulated by the conductive material for the test, so that the secondary damage of the FPC board in the detection process is avoided; and the method has high detection accuracy and efficiency, and strong operability.

Description

A kind of detection method of capacitive touch screen screen layer
Technical field
The present invention relates to detection method of capacitance-type touch screen, particularly a kind of detection method of capacitive touch screen inductor screen layer.Being applicable to the touch-screen screen layer is whole ITO(indium tin metal oxide) situation.
Background technology
Along with touch-screen in recent years in science and technology, commerce, and the widespread use in the daily life, the manufacturing firm of touch-screen is increasing, competition is also more and more fierce, the price of touch is in continuous decline.Under this form, touch-screen producer wants to increase profit, and its fine ratio of product must improve, the screen layer problem that a key factor that wherein concerns yield is touch-screen.
At present, for capacitive touch screen screen layer detection method, common is with Bonding(hot pressing) good FPC(flexible PCB) shielding pin pull down, then carry out quadratic B onding(hot pressing), Software function test again is to be confirmed whether the being screen layer problem; This method can be confirmed layer problem of covering of touch-screen to a certain extent, but it also has weak point, FPC shielding pin is in the process of pulling down, can use the instruments such as warm table, blade, the FPC(flexible PCB) the shielding pin can be subject to damage to a certain degree, to quadratic B onding(hot pressing) influential, if quadratic B onding(hot pressing) technology is bad, then can cause functional test results inaccurate.
 
Summary of the invention
Purpose of the present invention for overcoming the deficiencies in the prior art, provides a kind of detection method of capacitive touch screen screen layer exactly, and the screen layer that is applied to capacitive touch screen is whole ITO(indium tin metal oxide) situation.
The present invention realizes by such technical scheme: the detection method of capacitive touch screen screen layer, it is characterized in that, utilization is equipped with test computer, functional test plate and the functional test card extender of capacitive touch screen testing software, simulate FPC(with conductive material and print flexible circuit board) the shielding pin, realize accordingly the screen layer of touch-screen to be measured is detected;
The functional test plate comprises single-chip microcomputer; The functional test card extender is made by the double layer printed circuit plate, is used for circuit switching; The functional test plate is connected with test computer by the usb data line; The functional test plate is connected with the functional test card extender by winding displacement; The functional test card extender is printed flexible circuit board by ZIF or BTB connector with the FPC(of touch-screen to be measured) be connected; The functional test card extender is printed flexible circuit board by flexible cord and simulation FPC() conductive material of shielding pin is connected; One end of metal flexible cord is connected to the GND end of functional test card extender, and the other end is connected to simulates FPC(and prints flexible circuit board on the conductive material) the shielding pin; Conductive material adopts conductive adhesive tape;
Touch-screen to be measured comprises two kinds of structures:
Structure one: plating not on the ITO of touch-screen screen layer to be measured, screen layer surface conduction;
Structure two: be coated with protective seam on the ITO of touch-screen screen layer to be measured, the screen layer surface is non-conductive;
Described detection method comprises the step of following order:
Step 1: when touch-screen screen layer to be measured be structure for the moment, the ITO with screen layer cleans first, then directly will simulate FPC(and print flexible circuit board) conductive material that shields pin touches on the ITO of screen layer;
When touch-screen screen layer to be measured is structure two, the FPC(printing flexible circuit board that hot pressing is good) shielding pin is pulled down, inductor (sensor) screen layer place corresponding to pin cleans to shielding, will simulate FPC(printing flexible circuit board) the conductive material of shielding pin touch inductor (sensor) screen layer;
Step 2, touch-screen to be measured is connected by ZIF or BTB connector with the functional test card extender;
Step 3, functional test plate pass through Single-chip microcomputerContinual to touch-screen transmission sweep signal to be measured, and by signal line acquisition scans result, Single-chip microcomputerData are processed, and calculated the testing capacitor data of each node of touch-screen to be measured, node is electrode crossings in the touch-screen internal circuit, and the testing capacitor data communication device is crossed the usb data line sends test computer to;
The testing capacitor data that step 4, test computer receiving function test board send are compared with the normal electric capacity normal data of storing in the computer program, and the testing capacitor data are as in normal range, and test computer is then by screen display OK; If capacitance data is not in normal range, test computer is then by screen display NG;
Step 5 pair test result is judged: if test computer screen display OK, then illustrate touch-screen to be measured only screen layer problem is arranged, can be with the shielding pin Repair of touch-screen to be measured, if test computer screen display NG, then explanation is not simple screen layer problem, without the necessity of reprocessing, can directly scrap processing.
The advantage of invention of the present invention is: the detection method of capacitive touch screen screen layer, utilization is equipped with test computer, functional test plate and the functional test card extender of capacitive touch screen testing software, simulate the shielding pin of printing flexible circuit board with conductive material, detect; Avoided printing flexible circuit board secondary damage in testing process, Detection accuracy is high, and efficient is high, and is workable.
Description of drawings
The detection connection layout of Fig. 1, capacitive touch screen screen layer;
Fig. 2, functional test card extender connection layout.
Among the figure: 1. touch-screen to be measured, 2. functional test card extender, 3. metal wire, 4. conductive material, 5. winding displacement, 6. functional test plate, 7. usb data line, 8. test computer; 11. FPC(prints flexible circuit board), 21. connectors, 61. single-chip microcomputers, 62. IIC/SPI communication interfaces, 63. USB communication interfaces.
Embodiment
For a more clear understanding of the present invention, describe in conjunction with the accompanying drawings and embodiments the present invention in detail:
As shown in Figure 1 and Figure 2, the hardware of the detection of capacitive touch screen screen layer comprises test computer 8, functional test plate 6 and the functional test card extender 2 that the capacitive touch screen testing software is installed, simulate FPC(with conductive material 4 and print flexible circuit board) 11 shielding pin, detect touch-screen 1 screen layer to be measured;
Functional test plate 6 comprises single-chip microcomputer 61, IIC/SPI communication interface 62 and USB communication interface 63;
Functional test card extender 2 is made by the double layer printed circuit plate, is used for circuit switching, and the above is welded with connector 21, and functional test plate 6 is connected with test computer 8 by usb data line 7; Functional test plate 6 is connected with functional test card extender 2 by winding displacement 5; The functional test card extender is by corresponding to the connector 21 of ZIF or the BTB FPC(printing flexible circuit board with touch-screen 1 to be measured) 11 be connected; Functional test card extender 2 is by metal wire 3 and simulation FPC(printing flexible circuit board) conductive material 4 of 11 shielding pin is connected; One end of metal wire 3 is connected to the GND end of functional test card extender 2, and the other end of metal wire 3 is connected on the conductive material 4, is used for simulating FPC(and prints flexible circuit board) 11 shielding pin;
Conductive material 4 adopts conductive adhesive tape;
Touch-screen 1 to be measured comprises two kinds of structures:
Structure one, touch-screen to be measured 1 screen layer are plating (such as silicon dioxide, POC) not on the indium tin metal oxide (ITO) at the back side of touch-screen to be measured, the screen layer surface conduction;
Be coated with protective seam (such as silicon dioxide, POC) on the indium tin metal oxide (ITO) of structure two, touch-screen to be measured 1 screen layer (being the back side of touch-screen to be measured), the screen layer surface is non-conductive;
The detection method of capacitive touch screen screen layer comprises the step of following order:
A) when touch-screen 1 screen layer to be measured be structure for the moment, first indium tin metal oxide (ITO) surface of screen layer being cleaned, then directly will be simulated FPC(and print flexible circuit board) conductive material 4 of 11 shielding pin touches on the indium tin metal oxide (ITO) of screen layer;
When touch-screen 1 screen layer to be measured is structure two, the FPC(printing flexible circuit board that hot pressing is good) 11 shielding pin 111 is pulled down, inductor (sensor) screen layer place to shielding pin 111 correspondences cleans, and will simulate FPC(printing flexible circuit board) conductive material 4 of 11 shielding pin touches inductor (sensor) screen layer;
B) touch-screen 1 to be tested is connected by connector 21 with functional test card extender 2, functional test plate 6 is continual to touch-screen 1 transmission sweep signal to be measured by single-chip microcomputer 61, and by signal line 5 acquisition scans results, 61 pairs of data of single-chip microcomputer are processed, by calculating the testing capacitor data of touch-screen 1 each node to be measured (electrode crossings in the touch-screen internal circuit), and the testing capacitor data communication device is crossed usb data line 7 send test computer 8 to;
C) the testing capacitor data that send of test computer 8 receiving function test boards 6 are compared with the normal electric capacity normal data of storing in the computer program, and the testing capacitor data are as in normal range, and 8 of test computers are by screen display OK; If capacitance data is not in normal range, 8 of test computers pass through screen display NG.
D) test result is judged: if test computer 8 screen display OK illustrate that then screen layer has problem, can shield pin 111 Repairs to this touch-screen 1, improve yield; If test computer 8 screen display NG, then explanation is not pure screen layer problem, without the necessity of reprocessing, can directly scrap processing.
According to the above description, can realize the solution of the present invention in conjunction with art technology.

Claims (1)

1. the detection method of a capacitive touch screen screen layer, it is characterized in that, utilization is equipped with test computer, functional test plate and the functional test card extender of capacitive touch screen testing software, simulates FPC shielding pin with conductive material, realizes accordingly the screen layer of touch-screen to be measured is detected;
The functional test plate comprises single-chip microcomputer; The functional test card extender is made by the double layer printed circuit plate, is used for circuit switching; The functional test plate is connected with test computer by the usb data line; The functional test plate is connected with the functional test card extender by winding displacement; The functional test card extender is connected with the FPC of touch-screen to be measured by ZIF or BTB connector; The functional test card extender is connected by the conductive material of flexible cord with simulation FPC shielding pin; One end of metal flexible cord is connected to the GND end of functional test card extender, and the other end is connected to the shielding pin of simulating FPC on the conductive material; Conductive material adopts conductive adhesive tape;
Touch-screen to be measured comprises two kinds of structures:
Structure one: plating not on the ITO of touch-screen screen layer to be measured, screen layer surface conduction;
Structure two: be coated with protective seam on the ITO of touch-screen screen layer to be measured, the screen layer surface is non-conductive;
Described detection method comprises the step of following order:
Step 1: when touch-screen screen layer to be measured be structure for the moment, the ITO with screen layer cleans first, then directly will simulate the conductive material that FPC shields pin and touch on the ITO of screen layer;
When touch-screen screen layer to be measured was structure two, the shielding pin of the FPC that hot pressing is good was pulled down, and corresponding inductor screen layer place cleans to the shielding pin, and the conductive material of simulating the shielding pin of FPC is touched the inductor screen layer;
Step 2, touch-screen to be measured is connected by ZIF or BTB connector with the functional test card extender;
Step 3, functional test plate send sweep signal by single-chip microcomputer is continual to touch-screen to be measured, and by signal line acquisition scans result, single-chip microcomputer is processed data, and calculate the testing capacitor data of each node of touch-screen to be measured, node is electrode crossings in the touch-screen internal circuit, and the testing capacitor data communication device is crossed the usb data line sends test computer to;
The testing capacitor data that step 4, test computer receiving function test board send are compared with the normal electric capacity normal data of storing in the computer program, and the testing capacitor data are as in normal range, and test computer is then by screen display OK; If capacitance data is not in normal range, test computer is then by screen display NG;
Step 5, test result is judged: if test computer screen display OK, then illustrate touch-screen to be measured only screen layer problem is arranged, can be with the shielding pin Repair of touch-screen to be measured, if test computer screen display NG, then explanation is not simple screen layer problem, without the necessity of reprocessing, can directly scrap processing.
CN201210467733.7A 2012-11-19 2012-11-19 Method for detecting shielding layer of capacitive touch screen Expired - Fee Related CN102928675B (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103163447A (en) * 2013-03-28 2013-06-19 苏州瀚瑞微电子有限公司 Method for detecting flexible printed circuit (FPC) finished product
CN103197173A (en) * 2013-03-11 2013-07-10 广东欧珀移动通信有限公司 Test method of capacitance touch screen
CN103472341A (en) * 2013-09-27 2013-12-25 无锡宇宁光电科技有限公司 Device for detecting flexible circuit board and functional piece in capacitance screen
CN103529320A (en) * 2013-09-27 2014-01-22 无锡宇宁光电科技有限公司 Detection method for single-layer multi-point touch screen flexible printed circuit (FPC) and functional piece
CN104240627A (en) * 2014-09-18 2014-12-24 深圳市显创光电有限公司 Liquid-crystal display module testing device
CN104345926A (en) * 2013-07-24 2015-02-11 宸鸿科技(厦门)有限公司 Touch panel and testing method thereof
CN107422214A (en) * 2017-08-28 2017-12-01 长沙市宇顺显示技术有限公司 A kind of testing device for touch screens
CN107491205A (en) * 2017-07-12 2017-12-19 广州视源电子科技股份有限公司 A kind of all-in-one
CN111537867A (en) * 2020-06-03 2020-08-14 安徽方兴光电新材料科技有限公司 Detection device and detection method for short circuit and open circuit of touch screen anti-disassembly winding wire

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CN1752761A (en) * 2004-09-21 2006-03-29 比亚迪股份有限公司 Testing method of liquid crystal module manufacturing line and switching flexible printed circuit board
KR20080092633A (en) * 2007-04-13 2008-10-16 주식회사 협진아이엔씨 Touch screen
CN101846712A (en) * 2010-04-01 2010-09-29 苏州崴展电子科技有限公司 ITO (Indium Tin Oxide) electrical characteristic detecting method and detecting system of capacitance type touch screen
CN202433472U (en) * 2011-12-23 2012-09-12 厦门市翔宏科技股份有限公司 Test fixture for testing indium tin oxide (ITO) conductivity of sensor of capacitive panel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1752761A (en) * 2004-09-21 2006-03-29 比亚迪股份有限公司 Testing method of liquid crystal module manufacturing line and switching flexible printed circuit board
KR20080092633A (en) * 2007-04-13 2008-10-16 주식회사 협진아이엔씨 Touch screen
CN101846712A (en) * 2010-04-01 2010-09-29 苏州崴展电子科技有限公司 ITO (Indium Tin Oxide) electrical characteristic detecting method and detecting system of capacitance type touch screen
CN202433472U (en) * 2011-12-23 2012-09-12 厦门市翔宏科技股份有限公司 Test fixture for testing indium tin oxide (ITO) conductivity of sensor of capacitive panel

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103197173A (en) * 2013-03-11 2013-07-10 广东欧珀移动通信有限公司 Test method of capacitance touch screen
CN103163447A (en) * 2013-03-28 2013-06-19 苏州瀚瑞微电子有限公司 Method for detecting flexible printed circuit (FPC) finished product
CN104345926A (en) * 2013-07-24 2015-02-11 宸鸿科技(厦门)有限公司 Touch panel and testing method thereof
CN104345926B (en) * 2013-07-24 2018-08-07 宸鸿科技(厦门)有限公司 Touch panel and its test method
CN103472341A (en) * 2013-09-27 2013-12-25 无锡宇宁光电科技有限公司 Device for detecting flexible circuit board and functional piece in capacitance screen
CN103529320A (en) * 2013-09-27 2014-01-22 无锡宇宁光电科技有限公司 Detection method for single-layer multi-point touch screen flexible printed circuit (FPC) and functional piece
CN104240627A (en) * 2014-09-18 2014-12-24 深圳市显创光电有限公司 Liquid-crystal display module testing device
CN107491205A (en) * 2017-07-12 2017-12-19 广州视源电子科技股份有限公司 A kind of all-in-one
CN107491205B (en) * 2017-07-12 2020-07-28 广州视源电子科技股份有限公司 Integrated machine
CN107422214A (en) * 2017-08-28 2017-12-01 长沙市宇顺显示技术有限公司 A kind of testing device for touch screens
CN107422214B (en) * 2017-08-28 2019-08-02 长沙市宇顺显示技术有限公司 A kind of testing device for touch screens
CN111537867A (en) * 2020-06-03 2020-08-14 安徽方兴光电新材料科技有限公司 Detection device and detection method for short circuit and open circuit of touch screen anti-disassembly winding wire

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