CN102375629A - Built-in capacitive touch screen as well as driving method and device thereof - Google Patents
Built-in capacitive touch screen as well as driving method and device thereof Download PDFInfo
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- CN102375629A CN102375629A CN2010102548737A CN201010254873A CN102375629A CN 102375629 A CN102375629 A CN 102375629A CN 2010102548737 A CN2010102548737 A CN 2010102548737A CN 201010254873 A CN201010254873 A CN 201010254873A CN 102375629 A CN102375629 A CN 102375629A
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Abstract
The invention provides a built-in capacitive touch screen as well as a driving method and device thereof. The common electrode layer of the built-in capacitive touch screen comprises a plurality of strip electrodes which are mutually spaced. By applying the built-in capacitive touch screen, noise interference of the common electrode layer to a touch sensitive signal in a touch layer is reduced.
Description
Technical field
The present invention relates to touch sensible and lcd technology, particularly a kind of embedded capacitive touch-screen and driving method and drive unit.
Background technology
Touch-screen is as a kind of input media, than keyboard and mouse, for the user provides better convenience.According to different implementations, touch-screen can be divided into resistance-type, condenser type, surface acoustic wave type, infrared type etc., and what be widely used at present is resistance-type and capacitive touch screen technology.
With the interface of touch-screen as a kind of user's operation, the technology that is integrated in display panels display devices such as (LCD, LiquidCrystal Display) is of long duration.Traditional integration mode is that touch-screen is affixed on outward on the display screen module, and this mode is that touch-screen and display screen are separated manufacturing, and then with both assemblings.As shown in fig. 1; Comprise: touch-screen 10 and display screen 11; Wherein, Comprise the protective seam 101 and protective seam 103 that are positioned at the outside in the touch-screen 10, and the touch layer 102 between protective seam 101 and protective seam 103, said protective seam 101 can be that glass also can be the film of special substance with protective seam 103; Comprise top glass substrate 104 and lower glass substrate 110 in the display screen 11; Between top glass substrate 104 and lower glass substrate, be formed with black matrix (Black Matrix) layer 105, color film (color filter) layer 106, common electrode layer 107 successively; Liquid crystal layer 108 and thin film transistor (TFT) (TFT, Thin Film Transistor) layer 109.Above-mentioned touch-screen is the touch-screen of external hanging type, can for resistance-type also can be for capacitive, but, make the optical property of display screen 11 descend because its modular structure is complicated, and thickness is bigger.
For the thickness of attenuate entire module, improve its optical property, the mode that touch-screen directly is integrated in the display screen more and more receives publicity, and touch-screen and display screen simultaneously promptly complete.The common way of prior art is the top glass substrate that touch screen structure is made in display screen, and the concrete mode according to integrated can be divided into box following formula and embedded.Wherein, The box following formula is integrated in touch screen structure the outside surface of the top glass substrate of display screen; Just that the top glass substrate of display screen is shared; As the protective seam of touch screen structure, as shown in Figure 2, top glass substrate 203 and lower glass substrate 209 and the black matrix layer 204, color rete 205, common electrode layer 206, liquid crystal layer 207 and the tft layer 208 that are formed at successively between them have constituted display panels; Its structure is identical with traditional display panels; And touch layer 202 is positioned at the outside of top glass substrate 203, is formed with protective seam 201 on the touch layer 202, and protective seam 201, touch layer 202 and top glass substrate 203 have constituted touch screen structure jointly.
Embedded touch-screen then is fully integrated in touch screen structure in the display panels box; As shown in Figure 3; Comprise: top glass substrate 301 and lower glass substrate 308, and be formed at the touch layer 302 between them, black matrix layer 303, color rete 304, common electrode layer 305, liquid crystal layer 306 and tft layer 307 successively.
With respect to embedded touch-screen, box following formula touch-screen has the little advantage of noise, but its manufacture craft relative complex, and yield is lower.And embedded touch-screen is between last lower glass substrate, to make each rete, and technology is simple relatively, is fit to volume production.Embedded touch-screen also can be divided into embedded resistance-type touch-screen and embedded capacitive touch-screen, but because the deformation that the embedded resistance-type touch-screen need produce liquid crystal cell, its serviceable life is shorter, thereby the range of application of embedded capacitive touch-screen is wider.
Fig. 4 shows a kind of structure of the touch layer in the embedded capacitive touch-screen; Comprise: a plurality of induction electrodes 401 and drive electrode 402, wherein, induction electrode 401 longitudinal extensions; Be connected with line of induction S1, S2; Drive electrode 402 with delegation passes through the through hole transverse interconnects, is connected with drive wire D1, D2, D3, D4 respectively, and the bearing of trend of the bearing of trend of drive wire D1, D2, D3, D4 and line of induction S1, S2 intersects and be vertical.It is following that it detects principle: on drive wire, apply drive signal, in line of induction side change in detection signal.Drive wire is confirmed X to coordinate, and the line of induction is confirmed Y to coordinate, when detecting; To X to drive wire line by line scan; During each row drive wire, all read the signal on every line of induction in scanning, through the scanning taken turns; Just can travel through the intersection point of each row and column, thereby confirm which point has touch action.The equivalent circuit diagram of the intersection point of the drive wire and the line of induction is as shown in Figure 5; The mutual capacitance 503 that all is equivalent to be coupled of each intersection point place, the edge capacitance sum of pattern edge formation on the pattern edge on electric capacity and the drive wire that forms over against the overlapping place for drive wire and the line of induction and the line of induction; Resistance 502 is equivalent resistances of drive wire, and resistance 505 is equivalent resistances of the line of induction; The stray capacitance over the ground 504 of drive wire and the stray capacitance over the ground 510 of the line of induction; Driving source 501 is used to produce said drive signal; Touch control detection circuit 506 is amplifiers, and the electric signal on the line of induction is transformed into voltage signal Vout output.When finger touch; Be appreciated that to finger and between the drive wire of touch point and the line of induction, taken a bridge, the electric capacity that has been equivalent in mutual capacitance 503 parallel connection, thus mutual capacitance 503 equivalences are increased; Cause the electric signal on the line of induction to change, thereby output voltage V out is changed.
In conjunction with Fig. 3, the common electrode layer 305 and the distance between the touch layer 302 of the embedded capacitive touch-screen of prior art are very near, only be separated by black matrix layer 303 and color rete 304.Because in the display panels course of work; The drive signal that applies on the common electrode layer 305 is generally AC signal; Therefore, the noise of the voltage switching process of common electrode layer 305 generation is easy to the touch sensible signal in the touch layer 302 is caused interference and influence.If change the drive signal of common electrode layer 305 into direct current signal, can cause the power supply burden of driving circuit to strengthen again, and make the power consumption of whole embedded capacitive touch-screen become big.
Summary of the invention
The problem that the present invention solves provides a kind of embedded capacitive touch-screen and driving method and drive unit, under the prerequisite that does not change power consumption, reduces the noise of common electrode layer to the touch sensible signal.
For addressing the above problem, the present invention provides a kind of embedded capacitive touch-screen, and the common electrode layer of said embedded capacitive touch-screen comprises a plurality of strip shaped electric poles of space.
Optional, the bearing of trend of said strip shaped electric poles is vertical with the bearing of trend of the line of induction.
For addressing the above problem, the present invention provides the driving method of above-mentioned embedded capacitive touch-screen, comprising: on the corresponding strip shaped electric poles of the current pixel column that refreshes, apply common electrode signal, on other strip shaped electric poles, apply DC level.
Optional, said DC level comprises positive level, negative level or ground level.
For addressing the above problem, the present invention provides the drive unit of above-mentioned embedded capacitive touch-screen, comprising:
Driver element produces common electrode signal and DC level;
Control module obtains the current pixel column that refreshes and confirms corresponding strip shaped electric poles;
Switch unit is controlled by said control module, switches the signal that is applied to said strip shaped electric poles, on the corresponding strip shaped electric poles of the current pixel column that refreshes, applies common electrode signal, on other strip shaped electric poles, applies DC level.
Optional, said DC level comprises positive level, negative level or ground level.
Compared with prior art, technique scheme has the following advantages:
Common electrode layer in the embedded capacitive touch-screen in the technical scheme of the present invention is a plurality of strip shaped electric poles of space; In the driving process; Only on the corresponding strip shaped electric poles of the current pixel column that refreshes, apply the common electrode signal of interchange; On other strip shaped electric poles, apply DC level, thereby significantly reduced the noise of the common electrode signal of interchange the touch sensible signal.
Further, the bearing of trend of the strip shaped electric poles in the present technique scheme is vertical with the bearing of trend of the line of induction, has reduced the coupling between the strip shaped electric poles and the line of induction, has further reduced the noise of common electrode layer to the touch sensible signal in the touch layer.
Description of drawings
Fig. 1 is a kind of cross-sectional view of the external hanging type touch-screen of prior art;
Fig. 2 is a kind of cross-sectional view of the box following formula touch-screen of prior art;
Fig. 3 is a kind of cross-sectional view of the embedded touch-screen of prior art;
Fig. 4 is a kind of structural representation of the touch layer in the embedded touch-screen shown in Fig. 3;
Fig. 5 is the schematic equivalent circuit at the intersection point place of drive wire and the line of induction in the capacitive touch screen;
Fig. 6 and Fig. 7 are a kind of line of induction of the touch layer in the embedded touch-screen of the embodiment of the invention and the structural representation of drive wire;
Fig. 8 is that common electrode layer and the position of the line of induction in the embedded touch-screen of the embodiment of the invention concerns synoptic diagram;
Fig. 9 is the structural representation of drive unit of the embedded touch-screen of the embodiment of the invention.
Embodiment
In the embedded capacitive touch-screen of prior art, because the signal that applies on the common electrode layer wherein is an AC signal, can cause interference to the touch sensible signal in the touch layer, influence touches the degree of accuracy that detects.
In the present technique scheme; Common electrode layer is divided into a plurality of strip shaped electric poles of space; Only the corresponding strip shaped electric poles of the current pixel column that refreshes is applied the common electrode signal of interchange, other strip shaped electric poles are applied DC level, thereby reduced noise touch layer.
Further; In conjunction with Fig. 5, the inventor is through discovering, because the existence of mutual capacitance 503; Coupling between common electrode layer and the drive wire is little to the influence of the voltage signal Vout of output; And can directly have influence on the voltage signal Vout that touch control detection circuit 506 produces to the coupling of the line of induction, therefore, preferably the bearing of trend with the line of induction is vertical for the bearing of trend of the strip shaped electric poles of common electrode layer in the present technique scheme; Thereby reduce the coupling between the strip shaped electric poles and the line of induction, to reduce noise to the line of induction.
For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, does detailed explanation below in conjunction with the accompanying drawing specific embodiments of the invention.
Set forth detail in the following description so that make much of the present invention.But the present invention can be different from alternate manner described here and implements with multiple, and those skilled in the art can do similar popularization under the situation of intension of the present invention.Therefore the present invention does not receive the restriction of following disclosed embodiment.
The sectional structure chart of the embedded capacitive touch-screen of present embodiment is as shown in Figure 3, and its concrete introduction sees also the background technology part, repeats no more here.Wherein, color rete 303 is optional, if only be used for that GTG shows rather than during colored the demonstration, said color rete 303 can save.
The concrete structure of said touch layer 302 can be the structure shown in Fig. 4; Be that drive wire comprises the drive electrode 402 that a plurality of one-tenth matrixes are arranged; Induction electrode 401 is arranged between the two row drive electrodes; The bearing of trend of line of induction S1, S1 is connected to same the drive electrode current potential in the drive wire and equates perpendicular to the bearing of trend of drive wire D1, D2, D3, D4.
In addition, the concrete structure of said touch layer 302 can also be rhythmo structure, and wherein the drive wire and the line of induction are formed at respectively in drive electrode layer and the induction electrode layer, and is formed with dielectric layer between said drive electrode layer and the induction electrode layer.Fig. 6 and Fig. 7 show the structural representation of the line of induction and drive wire under this kind structure, and as shown in Figure 6, the said line of induction comprises a plurality of first figures 601 and first connecting portion 602 that is connected said first figure 601; As shown in Figure 7, said drive wire comprises a plurality of second graphs 701 and second connecting portion 702 that is connected said second graph 701.Said first figure 601 is a rhombus with second graph 701, and said first connecting portion 602 and second connecting portion 702 are over against overlapping, and said first figure 601 staggers with second graph 701 each other.If said touch layer 302 adopts this kind structure; Then preferred; The said line of induction is formed in the rete away from said common electrode layer 305, and drive wire is formed in the rete near said common electrode layer 305, makes that the distance between the line of induction and the common electrode layer 305 is bigger; A little less than the coupling, disturb less.
In conjunction with Fig. 3 and Fig. 8, Fig. 8 shows common electrode layer 305 and the mutual relationship between the line of induction 802 in the touch layer 302 among Fig. 3.In the present embodiment; Said common electrode layer 305 is the strip shaped electric poles 801 of a plurality of spaces; Be parallel to each other between each strip shaped electric poles 801, its material is tin indium oxide (ITO), and its formation method can be the strip shaped electric poles 801 that ito thin film is etched into said a plurality of spaces.As a preferred embodiment, the bearing of trend of said strip shaped electric poles 801 is vertical with the bearing of trend of the line of induction 802, makes that the coupling between them is minimum, has reduced the noise to the line of induction 802.Certainly, in other embodiments, the bearing of trend of said strip shaped electric poles 801 can also become other angles with the bearing of trend of the line of induction 802, like 45 degree, is parallel to each other etc.
Present embodiment also provides the corresponding driving method; In conjunction with Fig. 3, comprise multi-strip scanning line and data line in the said tft layer 307, be respectively applied for to each thin film transistor (TFT) and apply grid drive signal and source drive signal; In practical application; Through sweep trace each pixel is lined by line scan, when refreshing (i.e. scanning) each row pixel, apply the source drive signal to corresponding pixel through data line; Apply common electrode signal to common electrode layer 305 simultaneously, realize the demonstration that refreshes of pixel through the electric potential difference between source drive signal and the common electrode signal.Said common electrode signal is generally AC signal, upset back and forth between adjacent two two field pictures.General, the bearing of trend of said sweep trace is parallel with the bearing of trend of drive wire, is convenient to that the detection through touch signal is implemented in the location in the current display frame in demonstration.
In the process of lining by line scan of each pixel, on the corresponding strip shaped electric poles 801 of the current pixel column that refreshes, apply common electrode signal, and on other strip shaped electric poles, apply DC level, like positive level, negative level or ground level.Because what apply on the most strip shaped electric poles 801 in the said common electrode layer 305 is DC level, and the bearing of trend of strip shaped electric poles 801 is vertical with the bearing of trend of the line of induction, therefore, has reduced the noise of common electrode signal to the line of induction greatly.Because the resolution of current display panels is generally higher; Therefore multirow pixel that the coverage of a strip shaped electric poles 801 is often corresponding; In the image refreshing procedure for displaying; Do not need whenever to refresh one-row pixels and just switch the signal that applies on each strip shaped electric poles 801, lower switching frequency can't affect greatly power consumption.
Fig. 9 shows the structural representation of drive unit of the embedded capacitive touch-screen of present embodiment, and is as shown in Figure 9, comprising: driver element 901 produces common electrode signal and DC level; Control module 902 obtains the current pixel column that refreshes and confirms corresponding strip shaped electric poles; Switch unit 903 receives said control module 902 controls, switches the signal that is applied to said strip shaped electric poles, on the corresponding strip shaped electric poles of the current pixel column that refreshes, applies common electrode signal, on other strip shaped electric poles, applies DC level.
Said driver element 901 can be prior art common voltage generation circuit or signal generating circuit, is used to produce the direct current signal such as common electrode signal and positive level, negative level, ground level of interchange.
Said control module 902 can be a simple logical circuit; From the driving circuit of display panels, obtain the current pixel column that refreshes, in a look-up table (look up table), search the strip shaped electric poles of confirming in the corresponding common electrode layer of this pixel column afterwards.
Said switch unit 903 can comprise a plurality of either-or switch; The input end of each either-or switch receives common electrode signal and the direct current signal that driver element 901 produces respectively; Output terminal connects each strip shaped electric poles respectively; Control end receives said control module 902 controls, makes on the corresponding strip shaped electric poles of the current pixel column that refreshes, to apply common electrode signal, and on other strip shaped electric poles, applies DC level.
To sum up; Common electrode layer in the embedded capacitive touch-screen in the technical scheme of the present invention is a plurality of strip shaped electric poles of space; Only on the corresponding strip shaped electric poles of the current pixel column that refreshes, apply the common electrode signal of interchange; On other strip shaped electric poles, apply DC level, thereby significantly reduced the noise of the common electrode signal of interchange the touch sensible signal.
In addition, the bearing of trend of the strip shaped electric poles in the present technique scheme is vertical with the bearing of trend of the line of induction, has reduced the coupling between the strip shaped electric poles and the line of induction, has further reduced the noise of common electrode layer to the touch sensible signal in the touch layer.
Though the present invention with preferred embodiment openly as above; But it is not to be used for limiting the present invention; Any those skilled in the art are not breaking away from the spirit and scope of the present invention; Can utilize the method and the technology contents of above-mentioned announcement that technical scheme of the present invention is made possible change and modification, therefore, every content that does not break away from technical scheme of the present invention; To any simple modification, equivalent variations and modification that above embodiment did, all belong to the protection domain of technical scheme of the present invention according to technical spirit of the present invention.
Claims (6)
1. an embedded capacitive touch-screen is characterized in that, the common electrode layer of said embedded capacitive touch-screen comprises a plurality of strip shaped electric poles of space.
2. embedded capacitive touch-screen as claimed in claim 1 is characterized in that the bearing of trend of said strip shaped electric poles is vertical with the bearing of trend of the line of induction.
3. the driving method of each said embedded capacitive touch-screen in the claim 1 to 2 is characterized in that, comprising: on the corresponding strip shaped electric poles of the current pixel column that refreshes, apply common electrode signal, on other strip shaped electric poles, apply DC level.
4. the driving method of embedded capacitive touch-screen as claimed in claim 3 is characterized in that, said DC level comprises positive level, negative level or ground level.
5. the drive unit of each said embedded capacitive touch-screen in the claim 1 to 2 is characterized in that, comprising:
Driver element produces common electrode signal and DC level;
Control module obtains the current pixel column that refreshes and confirms corresponding strip shaped electric poles;
Switch unit is controlled by said control module, switches the signal that is applied to said strip shaped electric poles, on the corresponding strip shaped electric poles of the current pixel column that refreshes, applies common electrode signal, on other strip shaped electric poles, applies DC level.
6. the drive unit of embedded capacitive touch-screen as claimed in claim 5 is characterized in that, said DC level comprises positive level, negative level or ground level.
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| CN103293737A (en) * | 2012-09-26 | 2013-09-11 | 上海天马微电子有限公司 | Built-in capacitive touch screen crystal display module and driving method thereof |
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| WO2016082373A1 (en) * | 2014-11-27 | 2016-06-02 | 京东方科技集团股份有限公司 | In cell touch screen and touch control detection method thereof, and display device |
| EP2873999A4 (en) * | 2012-06-29 | 2016-06-08 | Shanghai Tianma Micro Elect Co | Capacitive liquid crystal display touch panel |
| EP2735946A3 (en) * | 2012-11-23 | 2016-11-30 | Shanghai Tianma Micro-electronics Co., Ltd. | In-cell touch panel and touch display device |
| CN107179852A (en) * | 2016-03-11 | 2017-09-19 | 先进传感技术有限公司 | Use the capacitance imaging apparatus and method of row electrode and row electrode |
| CN108073327A (en) * | 2013-11-15 | 2018-05-25 | 禾瑞亚科技股份有限公司 | Touch display device and driving method of multiple touch driving electrodes thereof |
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| US10437363B2 (en) | 2012-11-23 | 2019-10-08 | Shanghai Tianma Micro-electronics Co., Ltd. | In-cell touch panel and touch display device |
| EP2735946A3 (en) * | 2012-11-23 | 2016-11-30 | Shanghai Tianma Micro-electronics Co., Ltd. | In-cell touch panel and touch display device |
| CN108073327A (en) * | 2013-11-15 | 2018-05-25 | 禾瑞亚科技股份有限公司 | Touch display device and driving method of multiple touch driving electrodes thereof |
| CN108073327B (en) * | 2013-11-15 | 2021-04-09 | 禾瑞亚科技股份有限公司 | Driving method of multiple touch driving electrodes in touch display device |
| WO2016082373A1 (en) * | 2014-11-27 | 2016-06-02 | 京东方科技集团股份有限公司 | In cell touch screen and touch control detection method thereof, and display device |
| US9626055B2 (en) | 2014-11-27 | 2017-04-18 | Boe Technology Group Co., Ltd. | In-cell touch screen, touch detection method thereof and display device |
| CN107179852B (en) * | 2016-03-11 | 2022-07-01 | 贺米爱有限公司 | Capacitive imaging apparatus and method using row and column electrodes |
| CN107179852A (en) * | 2016-03-11 | 2017-09-19 | 先进传感技术有限公司 | Use the capacitance imaging apparatus and method of row electrode and row electrode |
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