CN201218943Y - Condenser type touch screen - Google Patents
Condenser type touch screen Download PDFInfo
- Publication number
- CN201218943Y CN201218943Y CNU200820094221XU CN200820094221U CN201218943Y CN 201218943 Y CN201218943 Y CN 201218943Y CN U200820094221X U CNU200820094221X U CN U200820094221XU CN 200820094221 U CN200820094221 U CN 200820094221U CN 201218943 Y CN201218943 Y CN 201218943Y
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Abstract
The utility model pertains to the field of touch screen, provides a capacitor type touch screen. The touch screen comprises a plurality of driver electrodes electrically coupled to the voltage source, positioned in the same plane in parallel to each other and having intervals therebetween; a plurality of detection electrodes positioned in a different plane perpendicular to driver electrodes in parallel with each other and having intervals therebetween, wherein coupling capacitors are formed at intersecting points of detection electrodes and driver electrodes; and at least one detection circuit electrically coupled to a detection electrode, detecting electric charge change generated by touching the touch screen, and converting the electric charge change into digital signal to be outputted. By detecting electric charge change when touching the touch screen, the utility model determines whether there is a touch and the touched position. The utility model is capable of improving measurement precision when electric charge is transferred, enhancing precision of positioning when touching. Meanwhile, column by column scanning or parallel column scanning, and row by row outputting or parallel row outputting is capable of being realized.
Description
Technical field
The utility model belongs to the touch-screen field, relates in particular to a kind of capacitive touch screen.
Background technology
Touch-screen is common input equipment, generally comprises touch panel, controller and software driver.Touch panel has the transparent panel of touch sensitive surface, is mainly used to the touch sensitive incident, and touch signal is sent to controller.Controller is handled touch signal, and the touch signal after will handling exports computer system to.Software driver converts touch event to incident that computer system can be discerned.
Touch-screen mainly comprises resistive touch screen, infrared touch panel, surface acoustic wave touch screen, capacitive touch screen etc.Wherein, in capacitive touch screen, touch panel is coated a kind of material that can stored charge.When panel was touched, a little charge attracted to the touch point, detected this charge variation by charge detection circuit, and this charge variation was sent to controller handles, and determined X, the Y coordinate of touch point, and then judged the position that touches.Because when touch panel was touched, the quantity of electric charge of coupling capacitance changed small, is difficult to accurate detection, therefore be difficult to guarantee the accurate location of touch point.
The utility model content
The purpose of this utility model is to provide a kind of capacitive touch screen, is intended to solve in the existing capacitive touch screen, because it is small to touch the variation of the coupling capacitance that causes, is difficult to the problem that accurately detects.
The utility model is achieved in that a kind of capacitive touch screen, and described touch-screen comprises:
With the voltage source electrical couplings, be positioned at conplane a plurality of being parallel to each other and spaced drive electrode;
Be positioned at Different Plane with drive electrode, and a plurality of be parallel to each other and spaced detecting electrode vertical with drive electrode, the point of crossing of described detecting electrode and drive electrode forms coupling capacitance; And
With described detecting electrode electrical couplings, detect the charge variation that described touch-screen is touched and produces, charge variation is converted at least one testing circuit of digital signal output.
The charge variation that the utility model produces when being touched by the senses touch screen judges whether touch and the position that touches, and can improve the precision of measuring when electric charge shifts, the accuracy of fixed point when strengthening touch.Simultaneously, can realize by column scan or also column scan, and output or also line output line by line, the data based algorithm of generation is handled, and can realize single-point or multiple point touching.
Description of drawings
Fig. 1 is the vertical view of the capacitive touch screen that provides of the utility model;
Fig. 2 is the structural drawing of the capacitive touch screen that provides of the utility model first embodiment;
Fig. 3 is the structural drawing of the capacitive touch screen that provides of the utility model second embodiment;
Fig. 4 is the circuit theory diagrams of the capacitive touch screen that provides of the utility model;
Fig. 5 is that the electric charge of the capacitive touch screen that provides of the utility model shifts the waveform synoptic diagram.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
In the utility model, the electric charge on the coupling capacitance is transferred to testing circuit, when touch-screen is touched, detect charge variation by testing circuit, can accurately judge the position that no touch and touch are arranged.
Fig. 1 shows the vertical view of the capacitive touch screen that the utility model provides, and for convenience of explanation, only shows the part relevant with the utility model.
This capacitive touch screen is made up of the two conductive layers of the separated by spaces that comprises a glass.The material of conductive layer generally is ITO (indium oxide).Strip shaped electric poles on each plane is parallel to each other and has at interval, and the electrode on the Different Plane is vertical mutually, and the point of crossing of two layer planes forms coupling capacitance 11.For example point as object, near coupling capacitance 11, the electric charge on the coupling capacitance 11 is siphoned away by the person, and the quantity of electric charge changes.
The electrode 10A (not shown) that links to each other with voltage source plays driving action, the electrode 10B (not shown) that links to each other with testing circuit, a detection effect.When driving voltage, electrode 10A and 10B produce coupling capacitance 11, simultaneously, testing circuit line by line or parallel detection 10B go up change in charge.When a certain row were connected with driving voltage, other was listed as ground connection.After all provisional capitals are scanned, represent that these row drive end, then carry out the scanning of next column.When all row all are scanned one time, represent a loop ends, then carry out next one circulation again.
Testing circuit can be measured the coupling capacitance on each electrode 10B, its effect is intensity and a change amount of determining coupling capacitance 11, simulating signal is become numerical data, pass to the controller of back and handle (not shown), determine the position that the coordinate of touch area promptly touches, thereby realize the function of single-point touches or multiple point touching.
In the utility model, the quantity of testing circuit is arbitrarily, can also can a testing circuit all be arranged each electrode 10B only with one.
Fig. 2 shows the structure of the capacitive touch screen that the utility model first embodiment provides, its electrode 10A and electrode 10B by the apart of transparent conductive medium structure forms, the electrode 10A of this apart is over-molded on two different layers with electrode 10B, forms two conductive layers.Be parallel to each other and have at interval at the strip shaped electric poles of same conductive layer, the electrode of different conductive layers is vertical mutually, and the point of crossing of the electrode on the two conductive layers forms coupling capacitance 11.Wherein, different coordinate of the common expression of each electrode 10A and electrode 10B, coordinate can be cartesian coordinate system (x and y), polar coordinate system (r, θ) or other coordinate systems.Electrode 10A electrical couplings plays driving action to voltage source (scheming not shown).Every strip electrode 10B all connects a testing circuit 30 that plays detection effect.When driving voltage, electrode 10A and electrode 10B produce coupling capacitance 11, and the testing circuit 30 parallel detection electrode 10B that are connected with every strip electrode 10B go up change in charge, and this charge variation is converted to digital signal, export controller (scheming not shown) to.Controller is handled this digital signal, and judge touch point position according to the coordinate (as x, y coordinate or r, θ coordinate etc.) of touch point, convert this touch event to incident that computing machine can be discerned by software driver (scheming not shown) again, handle according to algorithm, can realize the function of single-point or multiple point touching.
In the present embodiment,, thereby can go up change in charge by parallel detection 10B because every strip electrode 10B all connects a testing circuit 30, and can and the line output testing result, can reduce sweep time to greatest extent, improve sweep frequency.
Fig. 3 shows the structure of the capacitive touch screen that the utility model second embodiment provides, and it only is that with the difference of capacitive touch screen shown in Figure 2 all electrode 10B all are connected with testing circuit 30 by an on-off controller 12.Under the control of on-off controller 12, testing circuit 30 serial detecting electrode 10B go up change in charge, and electrode 10B is gone up change in charge are converted to digital signal, serial export controller (scheming not shown) to.In the utility model, because only need be for capacitive touch screen is provided with a testing circuit, thereby reduced the use of practical devices, simplified the structure of capacitive touch screen, reduced the capacitive touch screen cost.
Fig. 4 shows the circuit structure of the capacitive touch screen that the utility model provides, and for convenience of explanation, only shows the part relevant with the utility model.
The principle of work of testing circuit 30 is that the electric charge on the coupling capacitance 23 is transferred on the sampling capacitor 31, system's pulse number that the voltage on the counter 35 record sampling capacitors 31 passes through when 0V reaches threshold voltage.When touch panel is touched, cause the variation of coupling capacitance 23, thereby the change in voltage on the sampling capacitor 31 is transferred in influence, finally cause the difference of the pulse number of record, the difference of counter 35 register system pulse numbers, and the difference of pulse number transferred to controller (scheming not shown), in order to judge that touch-screen has or not the position that is touched and touches.
At first, Closing Switch 24 and 25, the charge circuit of formation coupling capacitance 23, to coupling capacitance 23 chargings, the capacitance of establishing coupling capacitance 23 is Cx.Cut- off switch 24 and 25 again, Closing Switch 24 and 26 simultaneously forms the charge circuit of sampling capacitor 31, and the electric charge on the coupling capacitance 23 is transferred on the sampling capacitor 31, and the capacitance of establishing coupling capacitance 23 is Cs.Obtain the value of U2 according to Q=Cx*U1=Cs*U2, comparer 34 compares voltage on the sampling capacitor 31 and threshold voltage, and the voltage on sampling capacitor 31 does not reach threshold voltage V
ThThe time, the circulation said process is transferred to the electric charge of coupling capacitance 23 on the sampling capacitor 31, up to comparer 34 with magnitude of voltage on the sampling capacitor 31 and threshold voltage V
ThWhen comparing, the magnitude of voltage on the sampling capacitor 31 has reached threshold voltage V
ThTill, its oscillogram is as shown in Figure 5.Voltage on sampling capacitor 31 has reached threshold voltage V
ThThe time, Closing Switch 32 is discharged to sampling capacitor 31, makes the magnitude of voltage zero clearing on the sampling capacitor 31.Through said process, the quantity of electric charge of coupling capacitance 23 can be transferred to sampling capacitor 31.Voltage on the counter 35 record sampling capacitors 31 reaches threshold voltage V from 0V
ThThe time system's pulse number.
When touch panel is touched, promptly when object (as finger) during near coupling capacitance 23, electric charge on the coupling capacitance is siphoned away by object, the quantity of electric charge of coupling capacitance 23 is changed, according to Q=Cx*U1=Cs*, learn that the voltage U 2 on the sampling capacitor 31 also changes, the voltage on sampling capacitor 31 reaches threshold voltage V
ThThe time, the voltage on the sampling capacitor 31 of counter 35 records reaches threshold voltage V from 0V
ThThe time system that passes through pulse number also change, thereby judge that capacitive touch screen is touched.When 30 pairs of drive electrodes 21 of testing circuit and detecting electrode 22 scan, can obtain the coordinate of touch point, by the coordinate of touch point is analyzed and is handled, can learn touch point position, can realize the function of single-point or multiple point touching as required.
Because the electrode in the capacitive touch screen in the two conductive layers is orthogonal, be parallel to each other and the interval with the electrode in one deck conductive layer, be subjected to of the influence of mutually vertical or parallel electrode with respect to the earth potential of the big surf zone of other circuit and capacitive touch screen, may produce stray capacitance 28, stray capacitance 28 may exert an influence to testing circuit 30.In the utility model, by switch 24 and 25 can 28 pairs of testing circuits 30 of shield parasitic capacitance influence, thereby improve the degree of accuracy that detects.
The charge variation that the utility model produces when being touched by the senses touch screen judges whether touch and the position that touches, and can improve the precision of measuring when electric charge shifts, the accuracy of fixed point when strengthening touch.Simultaneously, can realize by column scan or and column scan, corresponding can realize exporting line by line or and line output, and four kinds of combined methods all are feasible.In addition, adopt testing circuit of the present utility model, can save the A/D conversion, directly convert analog quantity to digital processing, reach the purpose of simplifying circuit.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (6)
1, a kind of capacitive touch screen is characterized in that, described touch-screen comprises:
With the voltage source electrical couplings, be positioned at conplane a plurality of being parallel to each other and spaced drive electrode;
Be positioned at Different Plane with drive electrode, and a plurality of be parallel to each other and spaced detecting electrode vertical with drive electrode, the point of crossing of described detecting electrode and drive electrode forms coupling capacitance; And
With described detecting electrode electrical couplings, detect the charge variation that described touch-screen is touched and produces, charge variation is converted at least one testing circuit of digital signal output.
2, capacitive touch screen as claimed in claim 1 is characterized in that, described testing circuit is a plurality of, each testing circuit and a corresponding connection of detecting electrode, change in charge on the described a plurality of detecting electrodes of parallel detection.
3, capacitive touch screen as claimed in claim 1 is characterized in that, described capacitive touch screen further comprises:
An on-off controller, an end of described on-off controller connects all detecting electrodes, and the other end connects described testing circuit;
Described testing circuit detects change in charge on described a plurality of detecting electrode in serial under the control of described on-off controller.
4, as claim 1,2 or 3 described capacitive touch screens, it is characterized in that described testing circuit comprises:
The operational amplifier that the detecting electrode that normal phase input end is corresponding with described detecting electrode connects;
Be connected across the normal phase input end of described operational amplifier and the sampling capacitor and the switch of output terminal, described switch is in parallel with described sampling capacitor;
With the output terminal of described operational amplifier, and the comparer of threshold voltage connection; And
Be connected the counter of register system pulse number difference and output with comparator output terminal.
5, capacitive touch screen as claimed in claim 1 is characterized in that, described touch-screen further comprises:
One end connects voltage source, and the other end connects first switch of described drive electrode; And
One end connects described drive electrode, the second switch of an end ground connection.
6, capacitive touch screen as claimed in claim 1 is characterized in that, described touch-screen further comprises:
One end connects described detecting electrode, and the other end connects the 3rd switch of described testing circuit; And
One end connects described detecting electrode, the 4th switch of an end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820094221XU CN201218943Y (en) | 2008-05-27 | 2008-05-27 | Condenser type touch screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820094221XU CN201218943Y (en) | 2008-05-27 | 2008-05-27 | Condenser type touch screen |
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| Publication Number | Publication Date |
|---|---|
| CN201218943Y true CN201218943Y (en) | 2009-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200820094221XU Expired - Lifetime CN201218943Y (en) | 2008-05-27 | 2008-05-27 | Condenser type touch screen |
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| CN101937298A (en) * | 2009-06-30 | 2011-01-05 | 索尼公司 | Touch sensor and display device |
| CN102236450A (en) * | 2010-04-29 | 2011-11-09 | 奇景光电股份有限公司 | Method for scanning touch panel |
| CN102262494A (en) * | 2010-05-26 | 2011-11-30 | 汉王科技股份有限公司 | Electromagnetic writing device and multi-way scanning method of antenna thereof |
| CN102375625A (en) * | 2010-08-10 | 2012-03-14 | 义隆电子股份有限公司 | Sensing circuit and method for capacitance type touch control panel |
| CN102541328A (en) * | 2010-12-27 | 2012-07-04 | 上海天马微电子有限公司 | Touch detection method, touch detection device and touch liquid crystal display device |
| CN102609160A (en) * | 2009-01-22 | 2012-07-25 | 义隆电子股份有限公司 | Method for detecting capacitance touchpad |
| CN101968701B (en) * | 2009-07-28 | 2012-08-22 | 瑞鼎科技股份有限公司 | Touch input device |
| CN101943716B (en) * | 2009-07-09 | 2012-11-28 | 联咏科技股份有限公司 | Capacitance measurement circuit and method |
| CN102981684A (en) * | 2011-07-28 | 2013-03-20 | 株式会社日本显示器东 | Touch panel and display device with a built-in touch panel |
| TWI411950B (en) * | 2009-12-28 | 2013-10-11 | Himax Tech Ltd | Touch panel |
| WO2014113983A1 (en) * | 2013-01-28 | 2014-07-31 | Texas Instruments Incorporated | Capacitive single layer multi-touch panel having improved response characteristics |
| CN104106030A (en) * | 2011-12-22 | 2014-10-15 | 纳米技术方案公司 | Switched-electrode capacitive-measurement device for touch-sensitive and contactless interfaces |
| CN104932762A (en) * | 2014-03-19 | 2015-09-23 | 原相科技股份有限公司 | Concurrent Driving Capacitive Touch Sensing Device Capable Of Resending Drive Signals |
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| US10019103B2 (en) | 2013-02-13 | 2018-07-10 | Apple Inc. | In-cell touch for LED |
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| CN102609160A (en) * | 2009-01-22 | 2012-07-25 | 义隆电子股份有限公司 | Method for detecting capacitance touchpad |
| CN101937298A (en) * | 2009-06-30 | 2011-01-05 | 索尼公司 | Touch sensor and display device |
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| KR20190108177A (en) * | 2011-12-22 | 2019-09-23 | 퀵스텝 테크놀로지스 엘엘씨 | Switched-electrode capacitive measurement device for touch-senstive and contactless interfaces |
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| US10719181B2 (en) | 2013-01-28 | 2020-07-21 | Texas Instruments Incorporated | Capacitive single layer multi-touch panel having improved response characteristics |
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| US10642418B2 (en) | 2017-04-20 | 2020-05-05 | Apple Inc. | Finger tracking in wet environment |
| CN111475054A (en) * | 2020-05-28 | 2020-07-31 | Tcl华星光电技术有限公司 | Mutual capacitance type touch screen driving method and device and terminal equipment |
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