CN201765576U - Piezoelectric type touch detection system - Google Patents
Piezoelectric type touch detection system Download PDFInfo
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- CN201765576U CN201765576U CN201020274328XU CN201020274328U CN201765576U CN 201765576 U CN201765576 U CN 201765576U CN 201020274328X U CN201020274328X U CN 201020274328XU CN 201020274328 U CN201020274328 U CN 201020274328U CN 201765576 U CN201765576 U CN 201765576U
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- 230000008859 change Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model provides a piezoelectric type touch detection system which is suitable for the technical field of touch sensors. The piezoelectric type touch detection system comprises a central control unit, a driving signal generating unit, a touch sensor and a touch induction detection unit which are sequentially connected to form a closed loop structure, wherein the touch sensor sequentially comprises a driving electrode layer, a piezoelectric material layer and an induction electrode layer, and the driving electrode layer comprises one or more driving electrodes and one or more induction electrodes; and the touch induction detection unit comprises one or more sub-detection units connected with the induction electrodes, each sub-detection unit comprises a capacitor, an impedance element, a voltage division resistor and an A/D (Analog to Digital) converter, the capacitor is connected with the input end of the A/D converter through the impedance element, the output end of the A/D converter is connected with the central control unit, one end of the voltage division resistor is connected to a node between the impedance element and the input end of the A/D converter, and the other end is grounded. The piezoelectric type touch detection system not only can detect the voltage intensity, but also can detect the position of a press-key accurately.
Description
Technical field
The utility model belongs to the touch sensor technologies field, relates in particular to a kind of piezoelectric type touch detecting system.
Background technology
Current touch sensible detection technique has a variety of, for example resistance-type, condenser type, inductance type, infrared type, ultrasound wave and piezoelectric type.
Except that piezoelectric type, can both reach reasonable accuracy of detection in the above detection technique, but because the defective of itself principle, can't effectively detect the pressure of button key position even number.
Though the piezoelectric type detection technique can effectively detect the pressure size of button, but being limited by electric charge that piezoelectric produces in the button process is consumed its detection signal of back and also decays to zero simultaneously, like this when pointing when sensor surface slides, it is difficult to realize the accurate location of coordinate, even can make the frequent saltus step of detection of coordinate in sliding process.
In a word, present touch sensible detection technique can't be taken into account the detection of position probing and pressure size accurately.
The utility model content
The purpose of this utility model is to provide a kind of piezoelectric type touch detecting system, and being intended to does not increase under the situation of sensor construction complexity, makes touch sensor have the measuring ability of position probing and pressure size accurately.
The utility model is achieved in that a kind of piezoelectric type touch detecting system, comprises the central control unit, drive signal generating unit, touch sensor and the touch sensible detecting unit that connect in turn and form a closed loop configuration;
Described touch sensor comprises drive electrode layer, piezoelectric material layer, induction electrode layer successively; Comprise one or more drive electrodes on the described drive electrode layer, comprise one or more induction electrodes on the described induction electrode layer;
Described touch sensible detecting unit comprises the sub-detecting unit that one or more and described induction electrode is connected, and each sub-detecting unit comprises electric capacity, impedor, divider resistance and A/D converter; Described electric capacity is connected with the input end of described A/D converter by described impedor, the output terminal of described A/D converter is connected with described central control unit, described divider resistance one end is connected in the node between the input end of described impedor and described A/D converter, other end ground connection.
Further, described drive electrode layer and described induction electrode layer closely are pasted on the both sides of described piezoelectric material layer respectively by conductive material.
Further, described conductive material is a conducting resinl.
Further, described touch sensor is installed on the touch key-press below.
Further, described touch sensor comprises that also one is positioned at the protective seam in the described drive electrode layer outside.
Further, described protective seam is glass plate or acrylic board.
In the utility model, by an electric capacity that is connected with induction electrode is set, can prevent that the extreme electric charge that produces of induction is neutralized in the button process, thereby guarantee that detection signal can continue to exist in whole button process, make touch detecting system not only can detect the pressure size, can also detect the position of button exactly, being different from detection signal that conventional piezoelectric detects can only exist and the inaccurate defective of position probing in button moment.
Description of drawings
Fig. 1 is the structure principle chart of the piezoelectric type touch detecting system that provides of the utility model embodiment;
Fig. 2 is the longitudinal section side view of the touch sensor among Fig. 1;
Fig. 3 is the vertical view of the touch sensor among Fig. 2;
Fig. 4 is the touch sensor among Fig. 1 and the particular circuit configurations figure of touch sensible detecting unit;
Fig. 5 is the annexation figure between expansion forms according to circuit structure shown in Figure 4 a plurality of drive electrodes and the induction electrode.
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.
Among the utility model embodiment, owing to have piezoelectric between induction pole and the driving stage, thereby can detect the key press size, again by an electric capacity that is connected with induction electrode is set, can prevent that the extreme electric charge that produces of induction is neutralized in the button process, thereby guarantee that detection signal can continue to exist in whole button process, make touch detecting system not only can detect the pressure size, can also detect the position of button exactly, being different from detection signal that conventional piezoelectric detects can only exist and the inaccurate defective of position probing in button moment.
Fig. 1 shows the structural principle of the piezoelectric type touch detecting system that the utility model embodiment provides, and for convenience of description, only shows the part relevant with present embodiment.
With reference to Fig. 1, central control unit 11, drive signal generating unit 12, touch sensor 13 and touch sensible detecting unit 14 connect in turn and form a closed loop configuration, wherein, central control unit 11 controlling and driving signal generating units 12 output drive signals, this drive signal drives touch sensor 13, and touch sensor 13 can be installed on the touch key-press below, and when the user had touch action, the piezoelectric signal on the touch sensor 13 can change thereupon.Piezoelectric signal on 14 pairs of touch sensors 13 of touch sensible detecting unit detects and exports testing result to CPU (central processing unit) 11, is calculated and is handled by CPU (central processing unit) 11.
Fig. 2 is the longitudinal section side view of the touch sensor 13 among Fig. 1, and touch sensor 13 comprises drive electrode layer 132, piezoelectric material layer 133 (as piezoelectric quartz etc.), induction electrode layer 134 successively.On drive electrode layer 132, comprise one or more drive electrodes again, on induction electrode layer 134, comprise one or more induction electrodes.In addition, also can be at drive electrode layer 132 arranged outside one protective seam 131, with all the other each layers of protection touch sensor 13 inside, protective seam 131 can be glass plate or acrylic board or the higher material of other hardness.Drive electrode layer 132 and induction electrode layer 134 need closely to stick on conductive materials such as conducting resinls the both sides of piezoelectric material layer 133, because piezoelectric belongs to semiconductor, itself can not conduct electricity, and has only conductive electrode to fit tightly with it and electric charge that it produces when pushing could be derived smoothly.
Fig. 3 is the vertical view of the touch sensor among Fig. 2, induction electrode on drive electrode on the drive electrode layer 132 and the induction electrode layer 134 all adopts rectangle rectangular, and the position between them is square crossing, be to be understood that, the shape of drive electrode and induction electrode is not limited thereto (for example can be the sawtooth strip) during concrete enforcement, and the cross reference between them also needn't be vertical, as long as not parallel.
Fig. 4 shows the touch sensor among Fig. 1 and the particular circuit configurations of touch sensible detecting unit, and wherein D represents the drive electrode on the drive electrode layer, and M represents piezoelectric material layer, and S represents the induction electrode on the induction electrode layer.Concrete annexation is: capacitor C is connected with the input end of A/D converter by impedor R1, the output terminal of A/D converter is connected with central control unit 11, divider resistance R2 one end is connected in the node between the input end of impedor R1 and A/D converter, other end ground connection.Above-mentioned impedor R1 can be the resistance that design needs adding, it also can be the line resistance of walking of ITO, the dividing potential drop of divider resistance R2 participation and capacitor C, impedor R1, AD is that analog to digital converter is then finally given central control unit 11 with detected magnitude of voltage and calculated and handle.
Be to be understood that, for the situation that comprises a plurality of induction electrodes on the touch sensor, need many group capacitor C, impedor R1, divider resistance R2 and A/D converters, wherein each group capacitor C, impedor R1, divider resistance R2 and A/D converter have been formed a sub-detecting unit in the touch sensible detecting unit 14, and each sub-detecting unit and each induction electrode connect one to one.
Below in conjunction with Fig. 1 to Fig. 4, position, number and corresponding pressure size that how the piezoelectric type touch detecting system that the utility model embodiment is provided detects the button that obtains being touched describe, wherein drive signal is used the signal of arbitrary form, to exchange to good, as square wave, sine wave or triangular wave, among Fig. 4 with square wave as demonstration.
After the parameter of frequency, impedor R1, divider resistance R2 and the capacitor C of drive signal satisfies certain condition, all have certain voltage difference at the two ends of each device.At this moment after the button that is touched produces pressure, a direct current voltage is equivalent to superpose once more on drive electrode D and the induction electrode S, thereby the voltage difference that makes each device two ends changes (voltage at R2 two ends also changes thereupon), and pressure is big more, the DC voltage of stack is high more, the change in voltage at final each device two ends is also big more, and the detection voltage of AD converter correspondence is respective change also, thereby central control unit 11 can be according to the size of the intensity perception key press of signal.
In addition during button, the pressure maximum at its button center, present the process of decay gradually successively outward, the existence of adding capacitor C can make the electric charge on the piezoelectric material layer M can not be neutralized, so it is stable always that the detection signal behind the button can keep, finally make central control unit 11 can obtain the particular location of button according to the size of data on each induction point, ratio, accuracy of detection and stability are than conventional art height.
In Fig. 2, Fig. 3, each point of crossing of drive electrode and induction electrode just is equivalent to a circuit among Fig. 4.In the testing process, earlier a certain drive electrode is applied driving, other drive electrode all disconnects, just can detect this drive electrode and with its each induction electrode that intersects on whether have key press.By that analogy, just can on the whole sensor face between all drive electrodes and the induction electrode key press on all point of crossing detect, thereby the number of the button that obtains being touched.Obviously driving is many more with the number of induction electrode, and the precision that can reach also will be high more in theory, and concrete number can be according to the size and the decision of required accuracy synthesis of sensor.
In the present embodiment concrete detection order is not limit, can be earlier at an induction electrode, detect the pressure on all drive electrode point of crossing corresponding with it, as shown in Figure 5, before the detection, a side of drive electrode D1～Dn and piezoelectric disconnects fully, after detecting beginning, each drive electrode is taken up in order of priority and piezoelectric material layer M connects, and the pressure at the overlapping place of they and induction electrode S is detected one by one.Certainly, also can a plurality of driving stages one group form drive detection, but need and piezoelectric disconnects for the drive electrode that does not detect, in testing circuit, adds other loop signal to prevent them, the precision of detection is impacted.And the like, can detect pressure between other induction electrode and each drive electrode more one by one by said method.
Among the utility model embodiment, by an electric capacity that is connected with induction electrode is set, can prevent that the extreme electric charge that produces of induction is neutralized in the button process, thereby guarantee that detection signal can continue to exist in whole button process, make touch detecting system not only can detect the pressure size, can also detect the position of button exactly, being different from detection signal that conventional piezoelectric detects can only exist and the inaccurate defective of position probing in button moment.The know-why of this piezoelectric type touch detecting system to single driving-induction electrode to or the right situation of a plurality of driving-induction electrodes of matrix form all applicable.
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 piezoelectric type touch detecting system is characterized in that, comprises the central control unit, drive signal generating unit, touch sensor and the touch sensible detecting unit that connect in turn and form a closed loop configuration;
Described touch sensor comprises drive electrode layer, piezoelectric material layer, induction electrode layer successively; Comprise one or more drive electrodes on the described drive electrode layer, comprise one or more induction electrodes on the described induction electrode layer;
Described touch sensible detecting unit comprises the sub-detecting unit that one or more and described induction electrode is connected, and each sub-detecting unit comprises electric capacity, impedor, divider resistance and A/D converter; Described electric capacity is connected with the input end of described A/D converter by described impedor, the output terminal of described A/D converter is connected with described central control unit, described divider resistance one end is connected in the node between the input end of described impedor and described A/D converter, other end ground connection.
2. piezoelectric type touch detecting system as claimed in claim 1 is characterized in that, described drive electrode layer and described induction electrode layer closely are pasted on the both sides of described piezoelectric material layer respectively by conductive material.
3. piezoelectric type touch detecting system as claimed in claim 2 is characterized in that, described conductive material is a conducting resinl.
4. piezoelectric type touch detecting system as claimed in claim 1 is characterized in that, described touch sensor is installed on the touch key-press below.
5. piezoelectric type touch detecting system as claimed in claim 1 is characterized in that, described touch sensor comprises that also one is positioned at the protective seam in the described drive electrode layer outside.
6. piezoelectric type touch detecting system as claimed in claim 5 is characterized in that, described protective seam is glass plate or acrylic board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020274328XU CN201765576U (en) | 2010-07-28 | 2010-07-28 | Piezoelectric type touch detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020274328XU CN201765576U (en) | 2010-07-28 | 2010-07-28 | Piezoelectric type touch detection system |
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| CN201765576U true CN201765576U (en) | 2011-03-16 |
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| CN201020274328XU Expired - Lifetime CN201765576U (en) | 2010-07-28 | 2010-07-28 | Piezoelectric type touch detection system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103092386A (en) * | 2011-11-07 | 2013-05-08 | 联想(北京)有限公司 | Electronic equipment and touch control method thereof |
| CN103907081A (en) * | 2011-10-27 | 2014-07-02 | Lg伊诺特有限公司 | Touch panel |
| CN106257382A (en) * | 2015-06-16 | 2016-12-28 | 禾瑞亚科技股份有限公司 | Force touch panel, system and touch processing device and method thereof |
| KR101765950B1 (en) | 2011-10-27 | 2017-08-23 | 엘지이노텍 주식회사 | Touch panel |
| CN108459774A (en) * | 2018-04-23 | 2018-08-28 | 京东方科技集团股份有限公司 | signal extraction, detection circuit and detection method, touch panel, display device |
-
2010
- 2010-07-28 CN CN201020274328XU patent/CN201765576U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103907081A (en) * | 2011-10-27 | 2014-07-02 | Lg伊诺特有限公司 | Touch panel |
| KR101765950B1 (en) | 2011-10-27 | 2017-08-23 | 엘지이노텍 주식회사 | Touch panel |
| US9857923B2 (en) | 2011-10-27 | 2018-01-02 | Lg Innotek Co., Ltd. | Touch panel including an elastic intermediate layer |
| CN103092386A (en) * | 2011-11-07 | 2013-05-08 | 联想(北京)有限公司 | Electronic equipment and touch control method thereof |
| CN106257382A (en) * | 2015-06-16 | 2016-12-28 | 禾瑞亚科技股份有限公司 | Force touch panel, system and touch processing device and method thereof |
| CN106257382B (en) * | 2015-06-16 | 2019-11-12 | 禾瑞亚科技股份有限公司 | Force touch panel, system and touch processing device and method thereof |
| CN108459774A (en) * | 2018-04-23 | 2018-08-28 | 京东方科技集团股份有限公司 | signal extraction, detection circuit and detection method, touch panel, display device |
| CN108459774B (en) * | 2018-04-23 | 2021-01-26 | 京东方科技集团股份有限公司 | Signal extraction and detection circuit and detection method, touch panel and display device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN GOODIX TECHNOLOGY CO., LTD. Free format text: FORMER NAME: SHENZHEN GOODIX TECHNOLOGY LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 13 floor, block B, Futian Free Trade Zone, Shenzhen, Guangdong, China, Patentee after: Shenzhen Huiding Technology Co., Ltd. Address before: 13 floor, block B, Futian Free Trade Zone, Shenzhen, Guangdong, China, Patentee before: Shenzhen Goodix Technology Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110316 |