CN104252274A - In-cell touch screen and driving device thereof - Google Patents
In-cell touch screen and driving device thereof Download PDFInfo
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- CN104252274A CN104252274A CN201310269159.9A CN201310269159A CN104252274A CN 104252274 A CN104252274 A CN 104252274A CN 201310269159 A CN201310269159 A CN 201310269159A CN 104252274 A CN104252274 A CN 104252274A
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- drive singal
- switch
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Abstract
The invention discloses a driving device of an in-cell touch screen. A transmission (TX) driving unit generates a TX driving signal coupled to a co-voltage electrode substrate; an RX electrode substrate senses an RX detection signal which is detected by an RX detection unit; the voltage swing of the TX driving signal is determined according to leaking current of a unit cell of a thin-film transistor unit of a liquid crystal module.
Description
Technical field
The present invention relates to a kind of embedded (in-cell) Touch Screen, particularly relate to a kind of drive unit of embedded touch screen.
Background technology
Touch Screen is output, the input media of combination of touch control technology and display technique, directly carries out interaction with shown person in order to allow user.The framework of existing multiple Touch Screen is suggested and manufactures.In order to allow Touch Screen thinner (and light), thus there is the proposition of embedded touch screen framework, in order to sensing electrode layer is moved in the Liquid Crystal Module of Touch Screen, but not being stacked on Liquid Crystal Module.
One of shortcoming of embedded touch screen is for sensitivity (or signal noise ratio) is compared with the Touch Screen lower than other kenel.Such as, although the mechanism having some to increase touch-control sensitivity is suggested, but most mechanism then has spinoff, low display quality.
Therefore need badly and propose a kind of novel mechanism, do not have the generation of spinoff in order to increase touch-control sensitivity.
Summary of the invention
In view of above-mentioned, one of object of the embodiment of the present invention is the drive unit proposing a kind of embedded touch screen, transmit the voltage amplitude (swing) of (TX) drive singal in order to increase, thus strengthen touch-control sensitivity and the display quality of Touch Screen can not be affected.
According to the embodiment of the present invention, embedded touch screen comprises common voltage electrode base board, transmission (TX) driver element, reception (RX) electrode base board and RX detecting unit.TX driver element produces TX drive singal and is coupled to common voltage electrode base board, and it is relevant to Liquid Crystal Module.Based on TX drive singal, on RX electrode base board, induction obtains RX detection signal.RX detecting unit is in order to detect RX detection signal.The voltage amplitude of TX drive singal determined according to the leakage current of the film crystal pipe unit structure cell of Liquid Crystal Module.In one embodiment, the voltage amplitude of TX drive singal be following two quantity with the size of the common voltage that common voltage electrode base board is relevant, and the size extending negative voltage.
Accompanying drawing explanation
Fig. 1 shows the schematic diagram of the drive unit of the embedded touch screen of the embodiment of the present invention; .
Fig. 2 A shows the schematic diagram of film crystal pipe unit structure cell;
Fig. 2 B and Fig. 3 illustrates drain-source electrode current Ids and corresponding grid-source voltage Vgs;
Fig. 4 illustrates the waveform of TX drive singal; And
Fig. 5 shows the schematic diagram of the generation circuit of TX drive singal.
Embodiment
Fig. 1 shows the schematic diagram of the drive unit of the embedded touch screen 100 of the embodiment of the present invention.In this manual, embedded touch screen refers to that sensing electrode layer is located at the electronic console in Liquid Crystal Module.In order to easily understand the present embodiment, Fig. 1 only shows the touch-control part of embedded touch screen 100.According to one of feature of the present embodiment, use common voltage (common-voltage) electrode base board of Liquid Crystal Module as transmission (TX) electrode base board 11, on it, patterning has multiple parallel TX electrode wires 111.Although Fig. 1 with the TX electrode wires 111 of rectilinear form illustratively, but TX electrode wires 111 also can be other shape, such as rhombus.The present embodiment also comprises reception (RX) electrode base board 12, and on it, patterning has multiple parallel RX electrode wires 121.Although Fig. 1 with the RX electrode wires 121 of rectilinear form illustratively, but RX electrode wires 121 also can be other shape, such as rhombus.TX electrode wires 111 perpendicular to RX electrode wires 121, but can be not limited to this.
As shown in Figure 1, TX electrode wires 111 receives the TX drive singal that TX driver element 13 sends respectively.RX detecting unit 14 receives RX detection signal respectively from RX electrode wires 121.RX detection signal by electric capacity between TX electrode wires 111 and RX electrode wires 121 respond to and obtain, and the finger touching that this electric capacity can be subject on RX electrode base board 12 affected.By this, the affected RX detection signal of electric capacity, together with driven TX electrode wires, can be used to determine touch position.
According to another feature of the present embodiment, improve the voltage amplitude of TX drive singal but do not worsen the leakage current of thin film transistor (TFT) (TFT) the unit structure cell of the display section of embedded touch screen 100.Fig. 2 A shows the schematic diagram of film crystal pipe unit structure cell 200, and its grid is coupled to sweep trace, and drain electrode is coupled to data line, and source electrode is coupled to common electrode Vcom via electric capacity C.Fig. 2 B illustrates drain-source electrode current Ids and corresponding grid-source voltage Vgs.Fig. 2 B also shows common voltage Vcom simultaneously.It should be noted that to strengthen the touch-control susceptibility of Touch Screen (particularly embedded touch screen), then leakage current also can and then increase, and thus reduces display quality if increase the voltage amplitude (if icon is toward moving left) of Vcom.
In the present embodiment, the voltage amplitude of TX drive singal considers the leakage current of film crystal pipe unit structure cell.As shown in Figure 3, voltage amplitude extends negative voltage Vncom for (just) common voltage Vcom adds, wherein extends negative voltage Vncom as illustrated extension of turning right.In other words, the voltage amplitude of the TX drive singal of the present embodiment be following two quantity and: the size of common voltage Vcom (that is | Vcom|), it is relevant to the common voltage electrode base board of Liquid Crystal Module; Extend the size (that is | Vncom|) of negative voltage Vncom.Therefore, the voltage amplitude of TX drive singal is greater than the size (that is | Vcom|) of common voltage Vcom.As illustrated in fig. 3, the scope of TX drive singal is from the Vgs of+5V(corresponding to-15V) to the Vgs of-5V(corresponding to-5V).By this, the voltage amplitude of TX drive singal is 5V | Vcom| adds 5V | and Vncom|, that is the voltage amplitude of 10V.Fig. 4 illustrates the waveform of TX drive singal, its scope from+| Vcom| to-| Vncom|.With rectangular wave illustratively, but also can use other signal waveform (such as string ripple) although.
The TX drive singal of the present embodiment can use various circuit design techniques to produce.As shown in Figure 5, by the first interrupteur SW 1 be coupled to alternately respectively with second switch SW2+| Vcom| with-| Vncom| and obtain TX drive singal, this first interrupteur SW 1 is controlled by switch-over control signal Φ and anti-phase switch-over control signal respectively with second switch SW2
.In addition ,+| Vcom| with-| Vncom| can use voltage more by a small margin and obtain by pump circuit (pump circuit).
According to above-described embodiment, the voltage amplitude of TX drive singal effectively can improve but can not affect the leakage current of the film crystal pipe unit structure cell of the display section of embedded touch screen 100.Therefore, the touch-control susceptibility of embedded touch screen 100 effectively can strengthen and can maintain the display quality of embedded touch screen 100 simultaneously.
The foregoing is only the preferred embodiments of the present invention, and be not used to the scope limiting claim of the present invention; Under all other does not depart from the spirit that invention discloses, the equivalence that completes changes or modifies, and all should be included in the scope of following claim.
[main element symbol description]
100 embedded touch screens
11 carry electrode substrates
111 carry electrode lines
12 receiving electrode substrates
121 receiving electrode lines
13 transmit driver element
14 receive detecting unit
200 film crystal pipe unit structure cells
TX transmits drive singal
RX receives detection signal
Vgs grid-source voltage
Ids drain-source electrode current
C electric capacity
Vcom common electrode
Vncom extends negative voltage
SW1 first switch
SW2 second switch
Φ switch-over control signal
anti-phase switch-over control signal
Claims (14)
1. a drive unit for embedded touch screen, described embedded touch screen comprise reception (RX) electrode base board and in be provided with the Liquid Crystal Module of common voltage electrode base board, described drive unit comprises:
Transmit (TX) driver element, be coupled to described common voltage electrode base board in order to produce TX drive singal, the induction of described RX electrode base board obtains RX detection signal, and detect by RX detecting unit;
The voltage amplitude of wherein said TX drive singal determined according to the leakage current of the film crystal pipe unit structure cell of described Liquid Crystal Module.
2. the drive unit of embedded touch screen according to claim 1, on wherein said common voltage electrode base board, patterning has multiple TX electrode wires, in order to receive described TX drive singal.
3. the drive unit of embedded touch screen according to claim 2, on wherein said RX electrode base board, patterning has multiple RX electrode wires, and it is coupled to described RX detecting unit.
4. the drive unit of embedded touch screen according to claim 1, the voltage amplitude of wherein said TX drive singal be following two quantity with the size of the common voltage that described common voltage electrode base board is relevant, and the size extending negative voltage.
5. the drive unit of embedded touch screen according to claim 4, the voltage amplitude of wherein said TX drive singal is greater than the size of described common voltage.
6. the drive unit of embedded touch screen according to claim 4, the scope of wherein said TX drive singal is from positive voltage to negative voltage.
7. the drive unit of embedded touch screen according to claim 4, wherein said TX driver element comprises:
In order to be coupled to the device of described common voltage;
In order to be coupled to the device of described extension negative voltage;
First switch, described common voltage controllably exports as described TX drive singal by this; And
Second switch, described extension negative voltage controllably exports as described TX drive singal by this;
Wherein said first switch and described second switch are controlled by switch-over control signal and anti-phase switch-over control signal respectively, be coupled to described common voltage and described extension negative voltage respectively alternately and obtain described TX drive singal by described first switch and described second switch.
8. an embedded touch screen, comprises:
Common voltage electrode base board, it is relevant to Liquid Crystal Module;
Transmit (TX) driver element, be coupled to described common voltage electrode base board in order to produce TX drive singal;
Receive (RX) electrode base board, based on described TX drive singal, on described RX electrode base board, induction obtains RX detection signal; And
RX detecting unit, in order to detect described RX detection signal;
The voltage amplitude of wherein said TX drive singal determined according to the leakage current of the film crystal pipe unit structure cell of described Liquid Crystal Module.
9. embedded touch screen according to claim 8, on wherein said common voltage electrode base board, patterning has multiple TX electrode wires, in order to receive described TX drive singal.
10. embedded touch screen according to claim 9, on wherein said RX electrode base board, patterning has multiple RX electrode wires, and it is coupled to described RX detecting unit.
11. embedded touch screens according to claim 8, the voltage amplitude of wherein said TX drive singal be following two quantity with the size of the common voltage that described common voltage electrode base board is relevant, and the size extending negative voltage.
12. embedded touch screens according to claim 11, the voltage amplitude of wherein said TX drive singal is greater than the size of described common voltage.
13. embedded touch screens according to claim 11, the scope of wherein said TX drive singal is from positive voltage to negative voltage.
14. embedded touch screens according to claim 11, wherein said TX driver element comprises:
In order to be coupled to the device of described common voltage;
In order to be coupled to the device of described extension negative voltage;
First switch, described common voltage controllably exports as described TX drive singal by this; And
Second switch, described extension negative voltage controllably exports as described TX drive singal by this;
Wherein said first switch and described second switch are controlled by switch-over control signal and anti-phase switch-over control signal respectively, be coupled to described common voltage and described extension negative voltage respectively alternately and obtain described TX drive singal by described first switch and described second switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310269159.9A CN104252274A (en) | 2013-06-28 | 2013-06-28 | In-cell touch screen and driving device thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310269159.9A CN104252274A (en) | 2013-06-28 | 2013-06-28 | In-cell touch screen and driving device thereof |
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| CN104252274A true CN104252274A (en) | 2014-12-31 |
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| CN201310269159.9A Pending CN104252274A (en) | 2013-06-28 | 2013-06-28 | In-cell touch screen and driving device thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105070268A (en) * | 2015-09-23 | 2015-11-18 | 深圳市华星光电技术有限公司 | Method and apparatus for reducing leakage current of embedded touch liquid crystal panel. |
| CN106708311A (en) * | 2015-11-18 | 2017-05-24 | 奇景光电股份有限公司 | In-cell touch screen and a controller adapted thereto |
| CN107402462A (en) * | 2017-09-21 | 2017-11-28 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and control method |
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| US20110128254A1 (en) * | 2009-05-29 | 2011-06-02 | Sony Corporation | Touch sensor, display and electronic device |
| CN102236464A (en) * | 2010-04-28 | 2011-11-09 | 索尼公司 | Display apparatus with touch detection functions, driving method, and electronic device |
| CN103150069A (en) * | 2013-03-01 | 2013-06-12 | 合肥京东方光电科技有限公司 | Capacitance type in cell touch panel and display device |
| CN103968231A (en) * | 2014-04-03 | 2014-08-06 | 上海华篷防爆科技有限公司 | Hydrogen storage device made of iron-based porous metal material |
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| US20110128254A1 (en) * | 2009-05-29 | 2011-06-02 | Sony Corporation | Touch sensor, display and electronic device |
| CN102236464A (en) * | 2010-04-28 | 2011-11-09 | 索尼公司 | Display apparatus with touch detection functions, driving method, and electronic device |
| CN103150069A (en) * | 2013-03-01 | 2013-06-12 | 合肥京东方光电科技有限公司 | Capacitance type in cell touch panel and display device |
| CN103968231A (en) * | 2014-04-03 | 2014-08-06 | 上海华篷防爆科技有限公司 | Hydrogen storage device made of iron-based porous metal material |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105070268A (en) * | 2015-09-23 | 2015-11-18 | 深圳市华星光电技术有限公司 | Method and apparatus for reducing leakage current of embedded touch liquid crystal panel. |
| US9778773B2 (en) | 2015-09-23 | 2017-10-03 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Method and device for decreasing leakage current of in-cell touch liquid crystal panel |
| CN105070268B (en) * | 2015-09-23 | 2017-10-24 | 深圳市华星光电技术有限公司 | Reduce the method and apparatus of the leakage current of embedded touch LCD panel |
| CN106708311A (en) * | 2015-11-18 | 2017-05-24 | 奇景光电股份有限公司 | In-cell touch screen and a controller adapted thereto |
| CN106708311B (en) * | 2015-11-18 | 2019-06-28 | 奇景光电股份有限公司 | Embedded touch screen and controller suitable for embedded touch screen |
| CN107402462A (en) * | 2017-09-21 | 2017-11-28 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and control method |
| CN107402462B (en) * | 2017-09-21 | 2020-06-05 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and control method |
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