CN204256708U - The driving circuit of touching device, touching device and display device - Google Patents
The driving circuit of touching device, touching device and display device Download PDFInfo
- Publication number
- CN204256708U CN204256708U CN201420820395.5U CN201420820395U CN204256708U CN 204256708 U CN204256708 U CN 204256708U CN 201420820395 U CN201420820395 U CN 201420820395U CN 204256708 U CN204256708 U CN 204256708U
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- operational amplifier
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- touching device
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- 230000003068 static effect Effects 0.000 claims abstract description 10
- 238000010586 diagram Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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Abstract
The utility model provides a kind of driving circuit of touching device, touching device and display device.The driving circuit of described touching device, comprises operational amplifier and control circuit, wherein, the touch-control sensing Electrode connection that the negative input of described operational amplifier and touching device comprise, the positive input of described operational amplifier is connected with described control circuit; Described control circuit, for in the touch stage by the Voltage Cortrol of the positive input of described operational amplifier for being within the first predetermined voltage range, touch-control sensing is carried out to control described touch-control sensing electrode, for in the display stage by the Voltage Cortrol of the positive input of described operational amplifier for being within the second predetermined voltage range, to shield extraneous static.It is still the voltage during touch-control stage that the utility model solves existing touching device controls touch sensible electrode voltage when showing the stage, can not corresponding change and shield extraneous static, easily produces the problem of interference.
Description
Technical field
The utility model relates to display field, particularly relates to a kind of driving circuit of touching device, touching device and display device.
Background technology
The voltage of touch-control sensing electrode was all set to be within the first predetermined voltage range in touch-control stage and display stage by the driving circuit of existing touching device, touch-control sensing electrode can be controlled in the touch-control stage like this and carry out touch-control sensing, but can not extraneous static be shielded in the display stage, easy generation interference, the circuit diagram of the driving circuit of concrete existing touching device is as follows.
As shown in Figure 1, existing touching device comprises touch-control drive electrode TX and touch-control sensing electrode RX, the driving circuit of existing touching device comprises operational amplifier 11 and control circuit 12, wherein, the positive input of described operational amplifier 11 is connected with described control circuit 12, and the negative input of described operational amplifier 11 is connected with described touch-control sensing electrode RX, and the output voltage of described operational amplifier 11 is Vout, VDD is supply voltage in FIG, and GND holds with being.Described control circuit 12 comprises the first end access supply voltage VDD of the first divider resistance R1 and the second divider resistance R2, R1, and second end of R1 is connected with the first end of R2, and second end of R2 holds GND to be connected with ground.In FIG, between the negative input of operational amplifier 11 and output terminal, be connected with feedback resistance Rf parallel with one another and feedback capacity Cf, to control to make operational amplifier 11 realize profound and negative feedbck.
The driving circuit of existing touching device operationally, in touch-control stage and display stage, the voltage of the positive input of control circuit 12 control algorithm amplifier 11 is all VDD × R2/ (R1+R2), voltage on touch-control stage touch-control sensing electrode is VDD × R2/ (R1+R2), can realize touch-control sensing; But in the display stage, the voltage on touch-control sensing electrode is still VDD × R2/ (R1+R2), extraneous electrostatic can not be shielded, easily produce interference, too increase power consumption.
Utility model content
Fundamental purpose of the present utility model is to provide a kind of driving circuit of touching device, touching device and display device, the voltage solving existing touching device control touch sensible electrode when showing the stage is still the voltage during touch-control stage, can not corresponding change and shield extraneous static, easily produce the problem of interference.
The utility model provides a kind of driving circuit of touching device, and described touching device comprises touch-control sensing electrode, and the driving circuit of described touching device comprises operational amplifier and control circuit, wherein,
The negative input of described operational amplifier and described touch-control sensing Electrode connection, the positive input of described operational amplifier is connected with described control circuit;
Described control circuit, for in the touch stage by the Voltage Cortrol of the positive input of described operational amplifier for being within the first predetermined voltage range, touch-control sensing is carried out to control described touch-control sensing electrode, for in the display stage by the Voltage Cortrol of the positive input of described operational amplifier for being within the second predetermined voltage range, to shield extraneous static.
During enforcement, described control circuit, specifically for accessing zero level at display stage control by the positive input of described operational amplifier.
During enforcement, described control circuit comprises the first transistor, transistor seconds, the first resistance and the second resistance, wherein,
The first end access supply voltage of described first resistance;
The first end of described second resistance is connected with the second end of described first resistance, the second end ground connection of described second resistance;
Described the first transistor, grid incoming control signal, the first pole is connected with the first end of described second resistance;
Described transistor seconds, grid accesses described control signal, and the first pole is connected with the second pole of described the first transistor and the positive input of described operational amplifier respectively, and the second pole is connected with the second end of described second resistance.
During enforcement, in the display stage, described control signal controls described the first transistor conducting and controls the cut-off of described transistor seconds; In the touch stage, described control signal controls the cut-off of described the first transistor and controls described transistor seconds conducting.
During enforcement, the driving circuit of touching device described in the utility model also comprises the feedback circuit between negative input and the output terminal of described operational amplifier being arranged at described operational amplifier;
Described feedback circuit, comprises feedback capacity parallel with one another and feedback resistance, makes described operational amplifier realize profound and negative feedbck for controlling.
The utility model additionally provides a kind of touching device, comprises touch-control sensing electrode, also comprises the driving circuit of above-mentioned touching device, the negative input of the operational amplifier that described driving circuit comprises and described touch-control sensing Electrode connection.
The utility model additionally provides a kind of display device, comprises above-mentioned touching device.
Compared with prior art, the driving circuit of touching device described in the utility model, touching device and display device, be within different predetermined voltage range by the voltage of the positive input of control circuit control algorithm amplifier in touch-control stage and display stage, according to the empty short principle of operational amplifier, be connected to the voltage (namely accessing the voltage of touch-control sensing electrode) of operational amplifier negative input also according to the corresponding change of different working stages, thus extraneous electrostatic can be shielded in the display stage of touching device, reduce interference.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the driving circuit of existing touching device;
Fig. 2 is the circuit diagram of the driving circuit of the touching device described in the utility model embodiment;
Fig. 3 is the circuit diagram of the driving circuit of the touching device described in another embodiment of the utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 2, the driving circuit of the touching device described in the utility model embodiment, comprises operational amplifier 21 and control circuit 22, wherein,
The touch-control sensing electrode RX that negative input and the described touching device of described operational amplifier 21 comprise is connected, and the positive input of described operational amplifier 21 is connected with described control circuit 22, and the output voltage of described operational amplifier 21 is Vout;
Described control circuit 22, for in the touch stage by the Voltage Cortrol of the positive input of described operational amplifier 21 for being within the first predetermined voltage range, touch-control sensing is carried out to control described touch-control sensing electrode RX, for in the display stage by the Voltage Cortrol of the positive input of described operational amplifier 21 for being within the second predetermined voltage range, to shield extraneous static.
The driving circuit of touching device described in the utility model, be within different predetermined voltage range by the voltage of the positive input of control circuit 22 control algorithm amplifier 21 in touch-control stage and display stage, according to the empty short principle of operational amplifier, be connected to the voltage (namely accessing the voltage of touch-control sensing electrode RX) of the negative input of operational amplifier 21 also according to the corresponding change of different working stages, thus extraneous electrostatic can be shielded in the display stage of touching device, reduce interference.
Preferably, described control circuit, specifically for the positive input of described operational amplifier being accessed zero level at display stage control, can eliminate extraneous static preferably like this, reducing interference and power consumption further.
During enforcement, described control circuit comprises the first transistor, transistor seconds, the first resistance and the second resistance, wherein,
The first end access supply voltage of described first resistance;
The first end of described second resistance is connected with the second end of described first resistance, the second end ground connection of described second resistance;
Described the first transistor, grid incoming control signal, the first pole is connected with the first end of described second resistance;
Described transistor seconds, grid accesses described control signal, and the first pole is connected with the second pole of described the first transistor and the positive input of described operational amplifier respectively, and the second pole is connected with the second end of described second resistance.
During enforcement, in the display stage, described control signal controls described the first transistor conducting and controls the cut-off of described transistor seconds; In the touch stage, described control signal controls the cut-off of described the first transistor and controls described transistor seconds conducting.
During enforcement, the driving circuit of touching device described in the utility model also comprises the feedback circuit between negative input and the output terminal of described operational amplifier being arranged at described operational amplifier;
Described feedback circuit, comprises feedback capacity parallel with one another and feedback resistance, makes described operational amplifier realize profound and negative feedbck for controlling.
As shown in Figure 3, the driving circuit of the touching device described in the utility model embodiment comprises operational amplifier 21, control circuit 22 and feedback circuit 23, wherein,
Described control circuit 22 comprises the first transistor T1, transistor seconds T2, the first resistance R1 and the second resistance R2, wherein,
The first end access supply voltage VDD of described first resistance R1;
The first end of described second resistance R2 is connected with second end of described first resistance R1, the second end ground connection of described second resistance R2;
Described the first transistor T1, grid incoming control signal TE, the first pole is connected with the first end of described second resistance R2;
Described transistor seconds T2, grid accesses described control signal TE, and the first pole is connected with second pole of described the first transistor T1 and the positive input of described operational amplifier 21 respectively, and the second pole is connected with second end of described second resistance R1;
The negative input of described operational amplifier 21 is connected with touch-control sensing electrode RX, and the output voltage of described operational amplifier 21 is Vout;
Described feedback circuit 23 comprises the feedback resistance Rf parallel with one another between negative input and output terminal and feedback capacity Cf that are arranged at described operational amplifier 21, described feedback circuit 23 makes described operational amplifier 21 realize profound and negative feedbck for controlling, equal with the voltage of the positive input and negative input that ensure described operational amplifier 21.
The transistor adopted in all embodiments of the utility model can be all thin film transistor (TFT) or field effect transistor or the identical device of other characteristics.In the utility model embodiment, transistor the two poles of the earth except grid are called the first pole and the second pole.
In the embodiment of the driving circuit in figure 3, T1 is n-type transistor, and T2 is p-type transistor, and when practical operation, the type of T1 and the type of T2 also can be changed, and above-mentionedly changes to conventionally known to one of skill in the art, does not repeat them here.
The driving circuit of touching device is as shown in Figure 3 operationally:
In the touch stage, described control signal TE is high level, described control signal TE control T1 conducting, and control T2 ends, and now the voltage of the positive input of described operational amplifier 21 is VDD × R2/ (R1+R2);
In the display stage, described control signal TE is low level, described control signal TE control T1 ends, control T2 conducting, now described operational amplifier 21 positive input ground connection, according to the empty short principle of operational amplifier, the voltage being connected to the negative input of operational amplifier 21 is also 0, namely control touch-control sensing electrode RX ground connection, thus make touching device the display stage can be good the electrostatic in the elimination external world, reduce interference and power consumption.
In the display stage, when the voltage of the positive input of described operational amplifier can be less than the positive level of supply voltage VDD for zero level or magnitude of voltage, the object of shielding extraneous static can be reached, but when the positive input access zero level of this operational amplifier, the effect of shielding extraneous static is best, can reduce interference and power consumption.
The utility model additionally provides a kind of touching device, comprises the driving circuit of touch-control sensing electrode and above-mentioned touching device, the negative input of the operational amplifier that described driving circuit comprises and described touch-control sensing Electrode connection.
The utility model additionally provides a kind of display device, comprises above-mentioned touching device.Described display device can be such as: any product or parts with Presentation Function such as liquid crystal panel, Electronic Paper, oled panel, mobile phone, panel computer, televisor, display, notebook computer, digital album (digital photo frame), navigating instrument.
The above is preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from principle described in the utility model; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (7)
1. a driving circuit for touching device, described touching device comprises touch-control sensing electrode, it is characterized in that, the driving circuit of described touching device comprises operational amplifier and control circuit, wherein,
The negative input of described operational amplifier and described touch-control sensing Electrode connection, the positive input of described operational amplifier is connected with described control circuit;
Described control circuit, for in the touch stage by the Voltage Cortrol of the positive input of described operational amplifier for being within the first predetermined voltage range, touch-control sensing is carried out to control described touch-control sensing electrode, for in the display stage by the Voltage Cortrol of the positive input of described operational amplifier for being within the second predetermined voltage range, to shield extraneous static.
2. the driving circuit of touching device as claimed in claim 1, is characterized in that, described control circuit, specifically for the positive input of described operational amplifier being accessed zero level at display stage control.
3. the driving circuit of touching device according to claim 2, is characterized in that, described control circuit comprises the first transistor, transistor seconds, the first resistance and the second resistance, wherein,
The first end access supply voltage of described first resistance;
The first end of described second resistance is connected with the second end of described first resistance, the second end ground connection of described second resistance;
Described the first transistor, grid incoming control signal, the first pole is connected with one end of described second resistance;
Described transistor seconds, grid accesses described control signal, and the first pole is connected with the second pole of described the first transistor and the positive input of described operational amplifier respectively, and the second pole is connected with the second end of described second resistance.
4. the driving circuit of touching device according to claim 3, is characterized in that, in the display stage, described control signal controls described the first transistor conducting and controls the cut-off of described transistor seconds; In the touch stage, described control signal controls the cut-off of described the first transistor and controls described transistor seconds conducting.
5. the driving circuit of the touching device as described in claim arbitrary in Claims 1-4, is characterized in that, also comprises the feedback circuit between negative input and the output terminal of described operational amplifier being arranged at described operational amplifier;
Described feedback circuit, comprises feedback capacity parallel with one another and feedback resistance, makes described operational amplifier realize profound and negative feedbck for controlling.
6. a touching device, comprise touch-control sensing electrode, it is characterized in that, also comprise the driving circuit of touching device as described in claim arbitrary in claim 1 to 5, the negative input of the operational amplifier that described driving circuit comprises and described touch-control sensing Electrode connection.
7. a display device, is characterized in that, comprises touching device as claimed in claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420820395.5U CN204256708U (en) | 2014-12-19 | 2014-12-19 | The driving circuit of touching device, touching device and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420820395.5U CN204256708U (en) | 2014-12-19 | 2014-12-19 | The driving circuit of touching device, touching device and display device |
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| Publication Number | Publication Date |
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| CN204256708U true CN204256708U (en) | 2015-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420820395.5U Expired - Fee Related CN204256708U (en) | 2014-12-19 | 2014-12-19 | The driving circuit of touching device, touching device and display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104484070A (en) * | 2014-12-19 | 2015-04-01 | 京东方科技集团股份有限公司 | Driving circuit and driving method of touch device, touch device and display device |
| CN105159504A (en) * | 2015-09-29 | 2015-12-16 | 江西沃格光电股份有限公司 | Touch display device and preparation method thereof |
-
2014
- 2014-12-19 CN CN201420820395.5U patent/CN204256708U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104484070A (en) * | 2014-12-19 | 2015-04-01 | 京东方科技集团股份有限公司 | Driving circuit and driving method of touch device, touch device and display device |
| WO2016095693A1 (en) * | 2014-12-19 | 2016-06-23 | 京东方科技集团股份有限公司 | Driving circuit and driving method for touch device, touch device and display device |
| US9891749B2 (en) | 2014-12-19 | 2018-02-13 | Boe Technology Group Co., Ltd. | Driving circuit and driving method for touch device, touch device, and display device |
| CN105159504A (en) * | 2015-09-29 | 2015-12-16 | 江西沃格光电股份有限公司 | Touch display device and preparation method thereof |
| CN105159504B (en) * | 2015-09-29 | 2018-05-22 | 江西沃格光电股份有限公司 | Touch control display apparatus with high-resistance coating and preparation method thereof |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150408 |