CN102375629B - 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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- CN102375629B CN102375629B CN201010254873.7A CN201010254873A CN102375629B CN 102375629 B CN102375629 B CN 102375629B CN 201010254873 A CN201010254873 A CN 201010254873A CN 102375629 B CN102375629 B CN 102375629B
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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 built-in capacitive touch screen and driving method thereof and drive unit.
Background technology
Touch-screen inputs medium as one, compared to keyboard and mouse, for 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 capacitance-type touch screen technology.
Using the interface of touch-screen as a kind of user operation, the technology being integrated in the display devices such as display panels (LCD, LiquidCrystal Display) is long-standing.Traditional integration mode to be affixed on display screen module outside touch-screen, and this mode touch-screen and display screen is separated to manufacture, and then both assembled.As shown in fig. 1, comprise: touch-screen 10 and display screen 11, wherein, touch-screen 10 comprises the protective seam 101 and protective seam 103 that are positioned at outside, and the touch layer 102 between protective seam 101 and protective seam 103, the film of described protective seam 101 and protective seam 103 can be glass also can be special substance; Display screen 11 comprises top glass substrate 104 and lower glass substrate 110, black matrix (Black Matrix) layer 105, color film (color filter) layer 106, common electrode layer 107 is formed successively between top glass substrate 104 and lower glass substrate, 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 be resistance-type also can for capacitive, but due to its modular structure complicated, thickness is comparatively large, and the optical property of display screen 11 is declined.
In order to the thickness of thinning whole module, improve its optical property, by touch-screen, the mode be directly integrated in display screen more and more receives publicity, and namely complete touch-screen and display screen simultaneously.The common practice of prior art is top glass substrate touch screen structure being made in display screen, according to integrated concrete mode, can be divided into box above formula and embedded.Wherein, touch screen structure is integrated in the outside surface of the top glass substrate of display screen by box above formula, namely 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 be formed at successively between them, color rete 205, common electrode layer 206, liquid crystal layer 207 and tft layer 208 constitute display panels, its structure is identical with traditional display panels, and touch layer 202 is positioned at the outside of top glass substrate 203, protective seam 201 is formed on touch layer 202, protective seam 201, touch layer 202 and top glass substrate 203 together constitute touch screen structure.
Touch screen structure is then fully integrated in display panels box by In-cell touch panel, as shown in Figure 3, comprise: top glass substrate 301 and lower glass substrate 308, and be formed at touch layer 302, black matrix layer 303, color rete 304, common electrode layer 305, liquid crystal layer 306 and the tft layer 307 between them successively.
Relative to In-cell touch panel, box above formula touch-screen has the little advantage of noise, but its manufacture craft relative complex, and yield is lower.And In-cell touch panel makes each rete between upper lower glass substrate, technique is relatively simple, is applicable to volume production.In-cell touch panel also can be divided into embedded resistance-type touch-screen and built-in capacitive touch screen, but needs to produce the deformation of liquid crystal cell due to embedded resistance-type touch-screen, and its serviceable life is shorter, and thus the range of application of built-in capacitive touch screen is wider.
Fig. 4 shows a kind of structure of the touch layer in built-in capacitive touch screen, comprise: multiple induction electrode 401 and drive electrode 402, wherein, induction electrode 401 is extending longitudinally, be connected with the line of induction S1, S2, with the drive electrode 402 of a line by through hole transverse interconnects, be connected respectively with drive wire D1, D2, D3, D4, the bearing of trend of drive wire D1, D2, D3, D4 intersects with the bearing of trend of the line of induction S1, S2 and vertical.Its Cleaning Principle is as follows: on drive wire, apply drive singal, in line of induction side change in detection signal.Drive wire determines that X is to coordinate, line of induction determination Y-direction coordinate, when detecting, to X to drive wire line by line scan, when scanning each row drive wire, all read the signal on every bar line of induction, the scanning taken turns by one, just can travel through the intersection point of each row and column, thus determine which point has touch action.The equivalent circuit diagram of the intersection point of drive wire and the line of induction as shown in Figure 5, each point of intersection is equivalent to the mutual capacitance 503 that has been coupled, for drive wire and the line of induction just to overlapping place formed just to the edge capacitance sum that pattern edge on pattern edge on electric capacity and drive wire and the line of induction is formed; 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 for generation of described drive singal; Touch control detection circuit 506 is amplifiers, the transform electrical signals on the line of induction is become voltage signal Vout and exports.When finger touch, can be understood as finger and taken a bridge between the drive wire and the line of induction of touch point, to be equivalent in mutual capacitance 503 electric capacity in parallel, thus mutual capacitance 503 equivalence is increased, cause the electric signal on the line of induction to change, thus make output voltage Vout change.
Composition graphs 3, the distance between the common electrode layer 305 of the built-in capacitive touch screen of prior art and touch layer 302 is very near, be only separated by black matrix layer 303 and color rete 304.Due in the display panels course of work, the drive singal that common electrode layer 305 applies is generally AC signal, therefore, the noise that the voltage switching process of common electrode layer 305 produces is easy to cause interference and impact to the touch sensible signal in touch layer 302.If change the drive singal of common electrode layer 305 into direct current signal, the power supply burden of driving circuit can be caused again to strengthen, and make the power consumption of whole built-in capacitive touch screen become large.
Summary of the invention
The problem that the present invention solves is to provide a kind of built-in capacitive touch screen and driving method thereof and drive unit, reduces the noise of common electrode layer to touch sensible signal under the prerequisite not changing power consumption.
For solving the problem, the invention provides a kind of built-in capacitive touch screen, the common electrode layer of described built-in capacitive touch screen comprises spaced multiple strip shaped electric poles.
Optionally, the bearing of trend of described strip shaped electric poles and the bearing of trend of the line of induction vertical.
For solving the problem, the invention provides the driving method of above-mentioned built-in capacitive touch screen, comprising: on the strip shaped electric poles that the pixel column of current refreshing is corresponding, apply common electrode signal, other strip shaped electric poles apply DC level.
Optionally, described DC level comprises positive level, negative level or ground level.
For solving the problem, the invention provides the drive unit of above-mentioned built-in capacitive touch screen, comprising:
Driver element, produces common electrode signal and DC level;
Control module, obtains the pixel column of current refreshing and determines corresponding strip shaped electric poles;
Switch unit, controls by described control module, switches the signal being applied to described strip shaped electric poles, the strip shaped electric poles that the pixel column of current refreshing is corresponding applies common electrode signal, other strip shaped electric poles apply DC level.
Optionally, described DC level comprises positive level, negative level or ground level.
Compared with prior art, technique scheme has the following advantages:
Common electrode layer in built-in capacitive touch screen in technical solution of the present invention is spaced multiple strip shaped electric poles, in driving process, on the strip shaped electric poles that the pixel column of current refreshing is corresponding, only apply the common electrode signal exchanged, other strip shaped electric poles apply DC level, thus the common electrode signal greatly reducing interchange is to the noise of touch sensible signal.
Further, the bearing of trend of the strip shaped electric poles in the technical program is vertical with the bearing of trend of the line of induction, reduces being coupled between strip shaped electric poles with the line of induction, further reduces the noise of common electrode layer to the touch sensible signal in touch layer.
Accompanying drawing explanation
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 above formula touch-screen of prior art;
Fig. 3 is a kind of cross-sectional view of the In-cell touch panel of prior art;
Fig. 4 is a kind of structural representation of the touch layer in In-cell touch panel shown in Fig. 3;
Fig. 5 is the schematic equivalent circuit of the point of intersection of drive wire in capacitive touch screen and the line of induction;
Fig. 6 and Fig. 7 is a kind of line of induction of touch layer in the In-cell touch panel of the embodiment of the present invention and the structural representation of drive wire;
Fig. 8 is the position relationship schematic diagram of common electrode layer in the In-cell touch panel of the embodiment of the present invention and the line of induction;
Fig. 9 is the structural representation of the drive unit of the In-cell touch panel of the embodiment of the present invention.
Embodiment
In the built-in capacitive touch screen of prior art, because the signal that common electrode layer wherein applies is AC signal, can cause interference to the touch sensible signal in touch layer, impact touches the degree of accuracy detected.
In the technical program, common electrode layer is divided into spaced multiple strip shaped electric poles, only corresponding to the pixel column of current refreshing strip shaped electric poles applies the common electrode signal exchanged, and applies DC level, thus reduce the noise to touch layer to other strip shaped electric poles.
Further, composition graphs 5, inventor finds through research, due to the existence of mutual capacitance 503, being coupled between common electrode layer with drive wire is little on the impact of the voltage signal Vout exported, and the voltage signal Vout of touch control detection circuit 506 generation directly can be had influence on to the coupling of the line of induction, therefore, in the technical program, the bearing of trend of the strip shaped electric poles of common electrode layer is preferably vertical with the bearing of trend of the line of induction, thus reduce strip shaped electric poles and being coupled between the line of induction, to reduce the noise to the line of induction.
For enabling above-mentioned purpose of the present invention, feature and advantage more become apparent, and are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
Set forth detail in the following description so that fully understand the present invention.But the present invention can be different from alternate manner described here to implement with multiple, those skilled in the art can when without prejudice to doing similar popularization when intension of the present invention.Therefore the present invention is not by the restriction of following public embodiment.
As shown in Figure 3, it specifically introduces and refers to background technology part the sectional structure chart of the built-in capacitive touch screen of the present embodiment, repeats no more here.Wherein, color rete 303 is optional, if when only showing for GTG display instead of colour, described color rete 303 can save.
The concrete structure of described touch layer 302 can be the structure shown in Fig. 4, namely drive wire comprises the drive electrode 402 of multiple one-tenth matrix arrangement, induction electrode 401 is arranged between two row drive electrodes, the bearing of trend of the line of induction S1, S1 is perpendicular to the bearing of trend of drive wire D1, D2, D3, D4, and the drive electrode current potential be connected in same drive wire is equal.
In addition, the concrete structure of described touch layer 302 can also be rhythmo structure, and wherein drive wire and the line of induction are formed in drive electrode layer and induction electrode layer respectively, and are formed with dielectric layer between described drive electrode layer and induction electrode layer.Fig. 6 and Fig. 7 shows the structural representation of the line of induction and drive wire under this kind of structure, and as shown in Figure 6, the described line of induction comprises multiple first figure 601 and the first connecting portion 602 being connected described first figure 601; As shown in Figure 7, described drive wire comprises multiple second graph 701 and the second connecting portion 702 being connected described second graph 701.Described first figure 601 and second graph 701 are rhombus, and described first connecting portion 602 and the second connecting portion 702 are just to overlapping, and described first figure 601 and second graph 701 stagger mutually.If described touch layer 302 adopts this kind of structure, then preferred, the described line of induction is formed in the rete away from described common electrode layer 305, and drive wire is formed in the rete of described common electrode layer 305, make the distance between the line of induction and common electrode layer 305 larger, be coupled more weak, disturb less.
Composition graphs 3 and Fig. 8, Fig. 8 show the mutual relationship between the common electrode layer 305 in Fig. 3 and the line of induction 802 in touch layer 302.In the present embodiment, described common electrode layer 305 is multiple spaced strip shaped electric poles 801, 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 ito thin film is etched into described multiple spaced strip shaped electric poles 801.As a preferred embodiment, the bearing of trend of described strip shaped electric poles 801 is vertical with the bearing of trend of the line of induction 802, makes the coupling between them minimum, decreases the noise to the line of induction 802.Certainly, in other embodiments, the bearing of trend of described strip shaped electric poles 801 can also become other angles with the bearing of trend of the line of induction 802, as 45 degree, is parallel to each other.
The present embodiment additionally provides corresponding driving method, composition graphs 3, described tft layer 307 comprises multi-strip scanning line and data line, be respectively used to apply grid drive singal and source drive singal to each thin film transistor (TFT), in actual applications, by sweep trace, each pixel is lined by line scan, while refreshing (namely scanning) every one-row pixels, source drive singal is applied to corresponding pixel by data line, apply common electrode signal to common electrode layer 305 simultaneously, the refreshing being realized pixel by the electric potential difference between source drive singal and common electrode signal is shown.Described common electrode signal is generally AC signal, overturns back and forth between adjacent two two field pictures.General, the bearing of trend of described sweep trace is parallel with the bearing of trend of drive wire, is convenient to the location realized in current display frame by the detection of touch signal while display.
Line by line scan in process in each pixel, the strip shaped electric poles 801 that the pixel column of current refreshing is corresponding applies common electrode signal, and on other strip shaped electric poles, applies DC level, as positive level, negative level or ground level.Due on strip shaped electric poles 801 most in described common electrode layer 305 apply is DC level, and the bearing of trend of strip shaped electric poles 801 and the bearing of trend of the line of induction vertical, therefore, substantially reduce the noise of common electrode signal to the line of induction.Resolution due to current display panels is general higher, therefore multirow pixel that the coverage of a strip shaped electric poles 801 is often corresponding, in image refreshing procedure for displaying, do not need often to refresh one-row pixels and just switch the signal that each strip shaped electric poles 801 applies, lower switching frequency can't affect greatly power consumption.
Fig. 9 shows the structural representation of the drive unit of the built-in capacitive touch screen of the present embodiment, as shown in Figure 9, comprising: driver element 901, produces common electrode signal and DC level; Control module 902, obtains the pixel column of current refreshing and determines corresponding strip shaped electric poles; Switch unit 903, controls by described control module 902, switches the signal being applied to described strip shaped electric poles, the strip shaped electric poles that the pixel column of current refreshing is corresponding applies common electrode signal, other strip shaped electric poles apply DC level.
Described driver element 901 can be the common voltage generation circuit of prior art or signal generating circuit, for generation of direct current signals such as the common electrode signal exchanged and positive level, negative level, ground levels.
Described control module 902 can be a simple logical circuit, from the driving circuit of display panels, obtain the pixel column of current refreshing, in a look-up table (look up table), search the strip shaped electric poles in the common electrode layer determining that this pixel column is corresponding afterwards.
Described switch unit 903 can comprise multiple either-or switch, the input end of each either-or switch receives common electrode signal and the direct current signal of driver element 901 generation respectively, output terminal connects each strip shaped electric poles respectively, control end controls by described control module 902, make to apply common electrode signal on the strip shaped electric poles that the pixel column of current refreshing is corresponding, and apply DC level on other strip shaped electric poles.
To sum up, common electrode layer in built-in capacitive touch screen in technical solution of the present invention is spaced multiple strip shaped electric poles, on the strip shaped electric poles that the pixel column of current refreshing is corresponding, only apply the common electrode signal exchanged, other strip shaped electric poles apply DC level, thus the common electrode signal greatly reducing interchange is to the noise of touch sensible signal.
In addition, the bearing of trend of the strip shaped electric poles in the technical program is vertical with the bearing of trend of the line of induction, reduces being coupled between strip shaped electric poles with the line of induction, further reduces the noise of common electrode layer to the touch sensible signal in touch layer.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; the Method and Technology content of above-mentioned announcement can be utilized to make possible variation and amendment to technical solution of the present invention; therefore; every content not departing from technical solution of the present invention; the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all belong to the protection domain of technical solution of the present invention.
Claims (5)
1. a built-in capacitive touch screen, is characterized in that, the common electrode layer of described built-in capacitive touch screen comprises spaced multiple strip shaped electric poles;
Wherein, comprising: on the strip shaped electric poles that the pixel column of current refreshing is corresponding, apply common electrode signal, other strip shaped electric poles apply DC level.
2. built-in capacitive touch screen as claimed in claim 1, it is characterized in that, the bearing of trend of described strip shaped electric poles is vertical with the bearing of trend of the line of induction.
3. the driving method of built-in capacitive touch screen as claimed in claim 1, it is characterized in that, described DC level comprises positive level, negative level or ground level.
4. a drive unit for built-in capacitive touch screen according to any one of claim 1 to 2, is characterized in that, comprising:
Driver element, produces common electrode signal and DC level;
Control module, obtains the pixel column of current refreshing and determines corresponding strip shaped electric poles;
Switch unit, controls by described control module, switches the signal being applied to described strip shaped electric poles, the strip shaped electric poles that the pixel column of current refreshing is corresponding applies common electrode signal, other strip shaped electric poles apply DC level.
5. the drive unit of built-in capacitive touch screen as claimed in claim 4, it is characterized in that, described DC level comprises positive level, negative level or ground level.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014000368A1 (en) * | 2012-06-29 | 2014-01-03 | 上海天马微电子有限公司 | Capacitive liquid crystal display touch panel |
| CN103293734B (en) | 2012-08-27 | 2015-12-02 | 上海天马微电子有限公司 | Embedded touch display device |
| CN102799332B (en) * | 2012-09-04 | 2016-03-02 | 北京集创北方科技有限公司 | A kind of embedded single layer capacitance touch-screen |
| CN103293737B (en) * | 2012-09-26 | 2016-01-06 | 上海天马微电子有限公司 | Built-in capacitive touch screen liquid crystal display module and driving method thereof |
| TWI475441B (en) * | 2012-10-19 | 2015-03-01 | Au Optronics Corp | In-cell touch display panel and driving method thereof |
| CN103279237B (en) | 2012-11-23 | 2016-12-21 | 上海天马微电子有限公司 | A kind of In-cell touch panel and touch display unit |
| TWI636300B (en) * | 2013-11-15 | 2018-09-21 | 禾瑞亞科技股份有限公司 | Touch display and method for driving a plurality of touch driving electrodes of touch display |
| CN104331210B (en) | 2014-11-27 | 2018-12-18 | 京东方科技集团股份有限公司 | A kind of In-cell touch panel, its touch control detecting method and display device |
| DE102017203994A1 (en) * | 2016-03-11 | 2017-09-14 | Advanced Sensor Technology Limited | Apparatus and method for capacitive imaging using row and column electrodes |
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| WO2007146783A2 (en) * | 2006-06-09 | 2007-12-21 | Apple Inc. | Touch screen liquid crystal display |
| CN101149654A (en) * | 2006-09-22 | 2008-03-26 | 陈其良 | Touch control type active panel display screen |
| CN101866228A (en) * | 2009-04-17 | 2010-10-20 | 上海天马微电子有限公司 | Touch screen, liquid crystal display device and driving method of touch screen |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101171185B1 (en) * | 2005-09-21 | 2012-08-06 | 삼성전자주식회사 | Touch sensible display device and driving apparatus and method thereof |
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| WO2007146783A2 (en) * | 2006-06-09 | 2007-12-21 | Apple Inc. | Touch screen liquid crystal display |
| CN101149654A (en) * | 2006-09-22 | 2008-03-26 | 陈其良 | Touch control type active panel display screen |
| CN101866228A (en) * | 2009-04-17 | 2010-10-20 | 上海天马微电子有限公司 | Touch screen, liquid crystal display device and driving method of touch screen |
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