CN101976161A - Method for detecting capacitive touch screen - Google Patents
Method for detecting capacitive touch screen Download PDFInfo
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- CN101976161A CN101976161A CN 201010237470 CN201010237470A CN101976161A CN 101976161 A CN101976161 A CN 101976161A CN 201010237470 CN201010237470 CN 201010237470 CN 201010237470 A CN201010237470 A CN 201010237470A CN 101976161 A CN101976161 A CN 101976161A
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Abstract
The invention relates to a method for detecting a capacitive touch screen. Two layers of ITO (Indium Tin Oxide) are arranged on the touch screen, and an insulating layer is arranged between the two layers of ITO. The method comprises the following steps of: emitting a pulse on any layer of ITO and detecting the current of the other ITO layer at the moment; and detecting whether the capacitive touch screen is abnormal by comparing whether the current values are both within a threshold value interval. The method for detecting the capacitive touch screen is simpler and more convenient and can rapidly and accurately judge whether the touch screen is abnormal or not, thereby preventing defective products from entering the next procedure and saving the cost.
Description
Technical field
The present invention relates to a kind of detection method of touch-screen, refer in particular to the detection method of capacitance touch screen.
Background technology
In recent years, along with the develop rapidly of touch technology, increasing product begins to utilize touch screen to finish direct control to destination object, thereby has replaced input equipments such as traditional mouse, operation ball, so not only saved the space, and carried convenient.And in recent years, detection method also having been arranged at the four-wire system resistance type touch control screen, it passes through the relatively magnitude of voltage at the different two ends of two conductive layers of touch screen, determines the zone of living in of each touch point on the described touch-screen; And determine the movement tendency of each touch point in described zone on the described touch-screen according to the magnitude of voltage at the different two ends of two conductive layers of described touch-screen, its particular content can be with reference to Chinese patent CN200810111921.X.Though said method can be used for detecting resistive touch screen, and simplified user's operation, but along with the continuous development of capacitive touch screen in recent years, more advantages that it has, the market that also will replace resistance type touch control screen is so we wish to find a kind of detection method at capacitive touch screen.
The method of traditional detection touching device mostly rests on the mechanical type test phase, and the common mechanical arm simulation finger that utilizes is rule on product, action such as gets ready, be used for simulating the mode of operation of actual persons, reading of data compares then, handle, judge at last whether product is qualified.Because this testing process need utilize mechanical arm to come the operational motion of emulation user finger, thus need the user to set mechanical arm in advance, the accuracy during with the assurance simulated operation.Must increase difficulty like this, and waste the time.
Therefore we wish and can solve above problem for users provide a kind of method more easily.
Summary of the invention
The actual technical matters to be solved of the present invention is how to provide a kind of capacitive touch screen that detects whether to have unusual method.
In order to realize above-mentioned purpose of the present invention, the invention provides a kind of detection method of capacitive touch screen, described touch-screen is provided with two-layer ITO, and be insulation course between the two-layer ITO, it may further comprise the steps: launching a pulse on one deck ITO arbitrarily, detect the size of current of another ITO layer this moment; Whether unusual thereby by contrasting above-mentioned current value if whether all in the threshold values interval, detecting this capacitive touch screen.
The detection method of capacitive touch screen of the present invention, utilize the method for detecting current to come the senses touch screen whether to exist unusually, replaced traditional mechanical detection step, not only method is easier, and can judge fast and accurately whether this touch-screen exists unusually, thereby avoided defective products to flow into next process, saved cost.
Description of drawings
Fig. 1 is the structural representation of touch-screen of the present invention;
Fig. 2 is the process flow diagram of detection method of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
The method of detection capacitive touch screen of the present invention, the structure that at first relates to capacitive touch screen, please refer to shown in Figure 1, this capacitance touch screen 1 mainly by substrate 10, be laid on two-layer ITO on the substrate 10 be indium tin oxide films 11 and 13 and the insulation course 12 that is between the two-layer ITO form.Described substrate 10 is positioned at the bottom of this capacitance touch screen 1, and two-layer ITO 11 and 13 is laid on respectively on this substrate 10, we its be set to ITO 11 on the X layer and the ITO 13 on the Y layer, described insulation course 12 is mainly used in isolates two-layer ITO, makes its mutually insulated.
Please, when senses touch shields 1, at first need to detect respectively the size of the circuit on each layer ITO in conjunction with reference to illustrated in figures 1 and 2.If detect the size of electric current on the X layer ITO 11, just need on Y layer ITO 13, give a pulse, as can just realizing a pulse to voltage on the Y layer ITO 13 by within a short period of time.By formula A=r ξ δ S/d (wherein A represent electric current, r to be represented as parameter definite value, a ξ represent specific inductive capacity, δ to represent impulse magnitude, S to represent area, d to represent the thickness of insulation course) as can be known: the thickness d of the size of the size of electric current A and pulse δ, the area S of X layer ITO 11 upper tracers and insulation course 12 is relevant, when we give 13 1 pulses of Y layer ITO, just can detect the size of the immediate current that produces on the X layer ITO 11 by the current detecting instrument thus.So according to above-mentioned formula, in the size one of pulse regularly, if X layer ITO 11 is short-circuited, the area of X layer ITO 11 upper tracers will inevitably increase so, so that the electric current that agitates also will inevitably become is big; On the contrary, if X layer ITO 11 opens a way, the electric current that agitates so will inevitably be less.Equally as can be known: under the certain situation of insulation course 12 materials by formula, if the less thick of insulation course 12, the electric current that then agitates can become greatly, on the contrary electric current will diminish, the above-mentioned mutual relationship of utilizing electric current and pulse is exactly the ultimate principle that the present invention detects.So when if when need detecting electric current on the Y layer ITO 13 big or small, just need on X layer ITO 11, give a pulse, and ultimate principle is identical with current methods on the detection X layer ITO 11, so just be not repeated.
Based on above-mentioned detection principle, we just can set out corresponding threshold values interval in advance according to the empirical value in when test, promptly comprise a higher limit and a threshold values interval of limiting down.So when detecting described current value, then can infer described touch-screen 1 or short circuit take place or its insulation course is crossed thin causing greater than this higher limit; And if when detect described current value less than this lower limit, then can infer described touch-screen 1 or taken place to open a way or make that its insulation course is blocked up to be caused.Because above-mentioned argumentation can find out the problem that touch-screen 1 may occur, thus solve at this problem just convenient again a lot, so also saved cost.And if the current value that detects X layer and Y layer all in described threshold values interval, illustrates that then this touch-screen without any unusually, can enter next process and suffer.
The detection method of capacitive touch screen of the present invention, not only method is easier, and can judge fast and accurately whether this touch-screen exists unusually, thereby has avoided defective products to flow into next process, has saved cost.
Claims (10)
1. the detection method of a capacitive touch screen, described touch-screen is provided with two-layer ITO, and is insulation course between the two-layer ITO, and it may further comprise the steps:
Launching a pulse on one deck ITO arbitrarily, detect the size of current of another ITO layer this moment;
Whether unusual thereby by contrasting above-mentioned current value if whether all in the threshold values interval, detecting this capacitive touch screen.
2. the method for claim 1 is characterized in that: described threshold values interval comprises a higher limit and a restriction down.
3. method as claimed in claim 1 or 2 is characterized in that: described threshold values can be set in advance.
4. the method for claim 1 is characterized in that: moment can have been agitated circuit in pulse of emission on one deck ITO arbitrarily, this moment another ITO layer, thereby can detect corresponding current value.
5. the method for claim 1, it is characterized in that: the current value that detects another ITO layer if launch a pulse on any one deck ITO is very big, and not in described threshold values interval, the ITO layer that this detection then is described short circuit occurred or insulation course is thin excessively.
6. the method for claim 1, it is characterized in that: the current value that detects another ITO layer if launch a pulse on any one deck ITO is very little, and not in described threshold values interval, the ITO layer that this detection then is described open circuit occurred or insulation course is blocked up.
7. as claim 5 or 6 described methods, it is characterized in that: above-mentionedly the situation that electric current exceeds the threshold values interval occurs and just can infer that this capacitive touch screen has occurred unusually.
8. the method for claim 1 is characterized in that: if a pulse of emission and the current value that detects another ITO layer are all in described threshold values interval on one deck ITO arbitrarily, illustrate that then this capacitive touch screen is not unusual.
9. the method for claim 1 is characterized in that: the size of described electric current and impulse magnitude and ITO layer upper tracer area relevant that produces electric current.
10. the method for claim 1 is characterized in that: the size of described ITO layer electric current can detect by the current detecting instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010237470 CN101976161A (en) | 2010-07-27 | 2010-07-27 | Method for detecting capacitive touch screen |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010237470 CN101976161A (en) | 2010-07-27 | 2010-07-27 | Method for detecting capacitive touch screen |
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| CN101976161A true CN101976161A (en) | 2011-02-16 |
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| CN 201010237470 Pending CN101976161A (en) | 2010-07-27 | 2010-07-27 | Method for detecting capacitive touch screen |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636718A (en) * | 2012-05-10 | 2012-08-15 | 意力(广州)电子科技有限公司 | Mutual capacitance touch screen detection method |
| CN102819476A (en) * | 2011-04-22 | 2012-12-12 | 原相科技股份有限公司 | In-situ detection of touchscreen panel shorts |
| CN102866317A (en) * | 2012-09-24 | 2013-01-09 | 广东欧珀移动通信有限公司 | Method and system for quick test of mobile terminal capacitive touch screen |
| CN103543344A (en) * | 2012-07-10 | 2014-01-29 | 上海斐讯数据通信技术有限公司 | Method for solving failure of capacitive screen and capacitive screen anomaly detection circuit |
| CN104238849A (en) * | 2013-06-07 | 2014-12-24 | 日本电产理德株式会社 | Checking device, checking device correcting method and checking method thereof |
| CN107450786A (en) * | 2017-08-07 | 2017-12-08 | 京东方科技集团股份有限公司 | Touch control controller including its contact panel and the method for detecting fault |
| CN109444650A (en) * | 2018-12-28 | 2019-03-08 | 深圳市欧珀达科技有限公司 | The open short circuit test method and device of oversize capacitance plate monofilm |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102819476A (en) * | 2011-04-22 | 2012-12-12 | 原相科技股份有限公司 | In-situ detection of touchscreen panel shorts |
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| CN102636718B (en) * | 2012-05-10 | 2014-08-20 | 意力(广州)电子科技有限公司 | Mutual capacitance touch screen detection method |
| CN103543344A (en) * | 2012-07-10 | 2014-01-29 | 上海斐讯数据通信技术有限公司 | Method for solving failure of capacitive screen and capacitive screen anomaly detection circuit |
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| CN102866317A (en) * | 2012-09-24 | 2013-01-09 | 广东欧珀移动通信有限公司 | Method and system for quick test of mobile terminal capacitive touch screen |
| CN104238849A (en) * | 2013-06-07 | 2014-12-24 | 日本电产理德株式会社 | Checking device, checking device correcting method and checking method thereof |
| CN104238849B (en) * | 2013-06-07 | 2018-07-03 | 日本电产理德株式会社 | Check device, the bearing calibration of check device and inspection method |
| CN107450786A (en) * | 2017-08-07 | 2017-12-08 | 京东方科技集团股份有限公司 | Touch control controller including its contact panel and the method for detecting fault |
| CN107450786B (en) * | 2017-08-07 | 2021-03-23 | 京东方科技集团股份有限公司 | Touch controller, touch panel comprising same and method for detecting circuit fault |
| CN109444650A (en) * | 2018-12-28 | 2019-03-08 | 深圳市欧珀达科技有限公司 | The open short circuit test method and device of oversize capacitance plate monofilm |
| CN109444650B (en) * | 2018-12-28 | 2021-07-30 | 深圳市欧珀达科技有限公司 | Open-short circuit testing method and device for single film of oversized capacitive screen |
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Application publication date: 20110216 |