CN101866228A - Touch screen, liquid crystal display device and driving method of touch screen - Google Patents
Touch screen, liquid crystal display device and driving method of touch screen Download PDFInfo
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- CN101866228A CN101866228A CN200910049590A CN200910049590A CN101866228A CN 101866228 A CN101866228 A CN 101866228A CN 200910049590 A CN200910049590 A CN 200910049590A CN 200910049590 A CN200910049590 A CN 200910049590A CN 101866228 A CN101866228 A CN 101866228A
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Abstract
The invention discloses a touch screen, a liquid crystal display device and a driving method of the touch screen. The touch screen comprises a display panel, wherein the display panel comprises a first baseplate and a second baseplate, wherein the first baseplate and the second baseplate are oppositely placed, and the second baseplate is provided with a plurality of groups of public electrode wires; a data driving circuit is connected with a data wire and used for supplying a display data driving signal for the data wire in a display mode; a grid driving circuit is connected with a grid wire and used for supplying a display grid driving signal for the grid wire in the display mode and supplying a touch grid driving signal for the grid wire in a touch mode; a public electrode signal generating circuit is connected with the public electrode wire and used for supplying a display public electrode signal for the public electrode wire in the display mode; and a touch driving circuit is connected with the data wire and the public electrode wire and used for supplying the same touch driving signal for the data wire and the public electrode wire in the touch mode, thereby improving the detection accuracy on the touch point position on the touch screen.
Description
Technical field
The present invention relates to technical field of manufacturing semiconductors, the driving method of particularly a kind of touch-screen, liquid crystal indicator and touch-screen.
Background technology
At present, in digital products such as ATM, POS vending machine, touch-screen has obtained widespread use.Usually touch-screen comprises capacitive touch screen and resistive touch screen.
Be illustrated in figure 1 as a kind of circuit equivalent figure of existing capacitive touch screen, comprising two-layer ITO (indium tin oxide target) layer, the ITO layer on upper strata is a public electrode 11, as the touch-control working lining, is used for carrying out touch-control when control mode touch mode, and receives touching signals; The ITO layer of lower floor is a screen layer 12, is used for shielding the noise of touch-screen.This touch-screen has 5 thread touch sensors: upper left line 82, upper right line 83, lower-left line 85, bottom right line 86 and shielding line 84.These 5 thread touch sensors are received on the same sinusoidal ac potential source 81.Upper left line 82, upper right line 83, lower-left line 85, bottom right line 86 are received the upper left corner 98 of the public electrode 11 of touch-screen respectively, the upper right corner 99, the lower left corner 100 is on the lower right corner 101.Screen layer 12 plays the effect of shielding external interference.And on public electrode 11, has non-conductive medium.The principle of work of this touch-screen is as follows: the non-conductive medium on the finger touch public electrode 11, when human body grounding, point identical with the current potential on ground, therefore between the touch-control working lining of finger touch position and the finger just equivalence be the electric capacity 88 of a ground connection, therefore just form a turning circuit from AC power 81 to finger, thereby produced electric current.The electric current I 1 that produces, I2, I3, the resistance R 1 that I4 and touch point 87 are arrived between four angles of touch-screen, R2, R3, R4 is inversely proportional to.And these four resistance R 1, R2, R3, the value of R4 arrives the upper left corner 98 with touch point 87 again, the upper right corner 99, the lower left corner 100, the distance in the lower right corner 101 is directly proportional, therefore by the electric current I 1 of detection on four angles, I2, I3, I4 just can determine the touch location of pointing 87.
Because above-mentioned public electrode is positioned at touch-screen inside, simultaneously also have signal wire, so the distance between public electrode and the signal wire is very near, thereby can produces stray capacitance in touch-screen inside, the electric capacity of data line and public electrode for example, the electric capacity of gate line and public electrode etc.
For above-mentioned touch screen structure, signal wire can produce considerable influence to testing result to the stray capacitance of public electrode, thereby makes to the touch point position detection inaccurate.
Summary of the invention
The purpose of this invention is to provide a kind of touch-screen and driving method thereof, improve the detection accuracy of position, touch point on the touch-screen.
In order to address the above problem, the invention provides a kind of touch-screen, comprising: display panel, comprise first substrate staggered relatively, second substrate, have the plural groups public electrode wire on described second substrate; Described first substrate has the thin film transistor (TFT) of array discharging on a side of second substrate, wherein the grid of the described thin film transistor (TFT) of each row is connected on the gate line, and each source electrode that is listed as described thin film transistor (TFT) is connected on the data lines; Described touch-screen also comprises: data drive circuit, be connected with described data line, and be used under display mode, providing the video data drive signal to described data line; Gate driver circuit is connected with described gate line, is used under display mode providing to described gate line showing gate drive signal and providing the touch-control gate drive signal to described gate line during at control mode touch mode; Common electrode signal produces circuit, is connected with described public electrode wire, is used for providing the demonstration common electrode signal to described public electrode wire under display mode; The touch-control driving circuit is connected with described data line and described public electrode wire, is used for providing identical touch-control drive signal to described data line and described public electrode wire under control mode touch mode.
Preferably, described data drive circuit is connected with data line by switch switching unit; The touch-control driving circuit is connected with described data line by the change-over switch unit.
Preferably, the touch-control driving circuit also is connected with data line by follower.
Preferably, described touch-screen is a resistive touch screen, and described touch-control drive signal is a DC voltage.
Preferably, described touch-screen is a capacitive touch screen, and described touch-control drive signal is an alternating voltage.
Preferably, described public electrode wire is a strip, described public electrode wire, and the interval between the adjacent described gate line is oppositely arranged.
Preferably, the public electrode wire of every group of strip is made of at least two strip public electrode wires that are connected.
Corresponding the present invention also provides a kind of driving method of touch-screen, comprises step:
Under display mode, data drive circuit provides the video data drive signal to data line, and gate driver circuit provides the demonstration gate drive signal to gate line, and common electrode signal produces circuit and provides the show electrode drive signal to public electrode wire;
Under control mode touch mode, gate driver circuit provides the touch-control gate drive signal to gate line, and the touch-control driving circuit provides identical touch-control drive signal to described public electrode wire and described data line.
Preferably, described data drive circuit is connected with data line by switch switching unit; The touch-control driving circuit is connected with described data line by switch switching unit;
Provide video data drive signal step and common electrode driving circuit before public electrode wire provides show electrode drive signal step, also to comprise at data drive circuit to data line: to adjust switch switching unit, described data drive circuit is connected with data line, and described common electrode signal produces circuit and is connected with public electrode wire;
Provide touch-control gate drive signal step and touch-control driving circuit before described public electrode wire and described data line provide identical touch-control drive signal, also to comprise at gate driver circuit to gate line: to adjust switch switching unit, described touch-control driving circuit is connected with data line, described touch-control driving circuit is connected with public electrode wire.
Preferably, described touch-control gate drive signal is to make all thin film transistor (TFT)s all be in the voltage signal of closed condition.
Preferably, video data drive signal, gate drive signal, show electrode drive signal, touch-control gate drive signal and touch-control drive signal are voltage signal.
Preferably, described touch-control gate drive signal is a negative voltage signal.
Accordingly, the present invention also provides a kind of liquid crystal indicator, comprises above-mentioned touch-screen.
Technique scheme, by when the control mode touch mode, provide identical touch-control drive signal to described data line and described public electrode wire, thereby electromotive force keeps equating on public electrode wire and the data line, therefore the electric capacity between public electrode wire and the data line just to the signal on the public electrode wire without any influence, so just reduce stray capacitance greatly, improved the accuracy of touch location detection.
Description of drawings
By the more specifically explanation of the preferred embodiments of the present invention shown in the accompanying drawing, above-mentioned and other purpose, feature and advantage of the present invention will be more clear.Reference numeral identical in whole accompanying drawings is indicated identical part.Painstakingly do not draw accompanying drawing, focus on illustrating purport of the present invention by physical size equal proportion convergent-divergent.
Fig. 1 is a kind of circuit equivalent figure of existing capacitive touch screen;
Fig. 2 is the equivalent circuit diagram of touch-screen one embodiment of the present invention;
Fig. 3 is the enlarged drawing of every group of public electrode wire;
Fig. 4 is the part-structure synoptic diagram of touch screen display panel of the present invention;
Fig. 5 is the part-structure synoptic diagram of resistive touch screen display panel of the present invention;
The process flow diagram of driving method one embodiment of Fig. 6 touch-screen of the present invention;
The oscillogram of the drive signal of Fig. 7 touch-screen driving method of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.A lot of details have been set forth in the following description so that fully understand the present invention.But the present invention can implement much to be different from alternate manner described here, and those skilled in the art can do similar popularization under the situation of intension of the present invention, so the present invention is not subjected to the restriction of following public concrete enforcement.
Can produce considerable influence at signal wire to testing result to the stray capacitance of public electrode, thereby make touch point position is detected inaccurate problem, inventor's research draws: show that with 2.83 cun module is an example, signal wire is about 14 nanofarads to total stray capacitance of public electrode.Wherein, data line accounts for 80% to the influence of public electrode, and the influence of gate electrode line accounts for 20%.Just data line influences the proportion maximum to public electrode.
Fig. 2 is the equivalent circuit diagram of touch-screen one embodiment of the present invention.As shown in Figure 2, touch-screen comprises that display panel 102, data drive circuit 200, gate driver circuit 300, common electrode signal produce circuit 400a and touch-control driving circuit 400b in one embodiment of the invention.
With reference to shown in Figure 2, display panel 102 comprises first substrate staggered relatively and second substrate, and described first substrate and second substrate are glass substrate, have liquid crystal layer between two glass substrates.Second substrate has plural groups public electrode wire 140 on a side of first substrate.First substrate has thin film transistor (TFT) on a side of second substrate (TFT, thin-film-transistor), described thin film transistor (TFT) array discharges.Wherein, the grid of each row TFT150 is connected on the gate line 161, and the source electrode of each row TFT is connected on the data lines 162, and data line 162 and gate line 161 are arranged on display panels first substrate.The drain electrode of all TFT150 all is connected on the electrode of first substrate.Data line 162 and gate line 161 arranged crosswise, TFT150 is positioned on the point of crossing of data line 162 and gate line 161.
This touch-screen has two kinds of mode of operations: display mode and control mode touch mode, and under the display mode, what LCD was carried out is demonstration work, and data line is connected with data drive circuit, and public electrode wire produces circuit with common electrode signal and is connected; And under control mode touch mode, what LCD was carried out is touch-control work, and data line all is connected with the touch-control driving circuit with public electrode wire.
As shown in Figure 2, described data drive circuit 200 is connected with described data line 162, and when touch-screen was operated in display mode, data drive circuit 200 was used for providing the video data drive signal to described data line 162.Concrete, described data drive circuit 200 is connected with data line 162 by switch switching unit 310.Can pass through gauge tap switch unit 310 like this, come control data driving circuit 200 to be connected with data line 162, and to data line 162 input video data drive signals; By gauge tap switch unit 310, come control data driving circuit 200 and data line 162 to disconnect.
Common electrode signal produces circuit 400a and is connected with described public electrode wire 140 by switch switching unit, is used for when display mode, provides the show electrode drive signal to described public electrode wire 140.Concrete, can pass through the gauge tap switch unit, control common electrode signal generation circuit 400a and be connected with public electrode wire 140, and to public electrode wire 140 input touch-control drive signals.
Described touch-control driving circuit 400b is connected with described data line 162 by switch switching unit, and be connected with public electrode wire 140 by switch switching unit 310, when being used for control mode touch mode, provide identical touch-control drive signal with described public electrode wire 140 to described data line 162.Concrete, can pass through gauge tap switch unit 310, control touch-control driving circuit 400b and be connected with data line 162, and to data line 162 and public electrode wire input touch-control drive signal.Preferably, touch-control driving circuit 400b also is connected with data line by follower 230, thereby has guaranteed to described data line 162 identical with the touch-control drive signal that described public electrode wire 140 provides.
Concrete, switch switching unit 310 can be a double acting switch, and just when display mode, double acting switch makes data drive circuit 200 be connected with described data line 162, and touch-control driving circuit 400b and described data line 162 disconnect; When control mode touch mode, double acting switch makes data drive circuit 200 and described data line 162 disconnect touch-control driving circuit 400b and 162 conductings of described data line.
Preferably, the described public electrode wire 140 that is positioned on second substrate is strip, and be positioned at the described public electrode wire 140 on described second substrate, and the interval between the adjacent described gate line 161 is oppositely arranged, to reduce the relative area between described public electrode wire 140 and the described gate line 161.Because the stray capacitance between public electrode wire 140 and the gate line 161 is the stray capacitance that influences the detected touch point position, the big more then stray capacitance of relative area between described public electrode wire 140 and the described gate line 161 is big more, therefore the relative area that reduces between public electrode wire 140 and the gate line 161 can reduce this stray capacitance greatly, thereby makes the touch point position of detection more accurate.
Fig. 3 is the enlarged drawing of every group of public electrode wire, preferably, shown in Figure 3, form by at least two strip public electrode wires that are connected with described gate line 161 spaced public electrode wires 140 for every group, preferably, present embodiment shows every group of public electrode wire 140 and is made of strip public electrode wire 140b, 140c and the 140d of three connections.Can further reduce stray capacitance like this.
Concrete, described touch-screen can be capacitive touch screen or resistive touch screen.For example as shown in Figure 4, for the ease of clearly demonstrating, Figure 4 shows that the part-structure synoptic diagram of display panel, therefore specifically in conjunction with shown in Figure 2, touch-screen can have the structure of capacitive touch screen: public electrode wire 140 has touch induction lines 142 away from a side of first substrate on second substrate, described touch induction lines 142 and public electrode wire 140 cross arrangements.Because every group of public electrode wire 140 and touch induction lines 142 all can have a node 142a, so each node 142a can form a mutual capacitance 142b.When finger touch, because finger causes near the electric field of node to change, thereby the value of this mutual capacitance 142b is changed, just can detect the output signal of each node correspondence then by charge amplifier 36, so just obtain touch location accurately.
In other embodiments, touch-screen can be resistive touch screen, the structure that for example has resistive touch screen as shown in Figure 5: on second substrate 120, make several projections electrode 510 by lithography, and public electrode wire 140 is deposited on second substrate 120 of projected electrode 510.On first substrate 110, the mutually perpendicular line of induction 520 is arranged.When finger touch, the pressure of finger makes 120 distortion of second substrate, thereby makes projected electrode 510 touch the line of induction 520 at touch location.So will detect the signal of public electrode wire 140 on the line of induction 520 of touch location, the horizontal ordinate of touch point just can be determined in the position of the perpendicular line of induction 520 by detecting common electrode signal.
In existing touch-screen, no matter be resistive touch screen or capacitive touch screen, when control mode touch mode, owing to all have certain voltage difference between public electrode wire and the signal wire, thus make the bigger stray capacitance of existence between public electrode wire and the signal wire.And when display mode, the stray capacitance between public electrode wire and the signal wire also can influence the quality of demonstration conversely.
In other embodiments, this touch-screen also can be other structure except that LCDs, for example plasma touch-screen.
The present invention also provides a kind of liquid crystal indicator that comprises above-mentioned touch-screen in addition.
Below in conjunction with the working method of above-mentioned capacitive touch screen, the driving method of touch-screen is described.Fig. 6 is the driving method process flow diagram of touch-screen.
The driving method of capacitive touch screen with reference to figure 2, Fig. 3, Fig. 4 and Fig. 6, comprises the following steps: in the present embodiment
S1: data drive circuit 200 provides the video data drive signal to data line 162, and gate driver circuit 300 provides the demonstration gate drive signal to gate line 161, and common electrode signal produces circuit 400a and provides the show electrode drive signal to public electrode wire 140.
Wherein video data drive signal, demonstration gate drive signal and show electrode drive signal are voltage signal.The oscillogram of the drive signal of touch-screen as shown in Figure 7, time period t 1 is the demonstration time, when in time period t 1, showing, demonstration gate drive signal Vgate by pulse opens the TFT150 that will show, for example import signal Vgate (1) to Vgate (n-1), Vgate (n), open each row TFT150 successively, thereby by input video data drive signal dataline and show electrode drive signal Vcom, electrode on first substrate that links to each other with TFT150 and public electrode wire 140 are added in the liquid crystal capacitance both sides that liquid crystal layer forms with voltage, thereby show.Wherein, n is a natural number.
Concrete, the scanning of a display frequency is 60Hz in the present embodiment, the time of a frame is about 16.7 milliseconds.Display is the QVGA display of 240X320 pixel, show like this width of gate drive signal Vgate pulse the longest can be 52 microseconds.The width of the demonstration gate drive signal Vgate pulse that general gate driver circuit can produce is more much smaller than this.Use the demonstration gate drive signal Vgate of 40 microsecond pulse width in the present embodiment, each frame just only needs the about 13 milliseconds of scannings that just can finish whole display pixels so, and just t1 is 13 milliseconds.So next, there is the time about 3.6 milliseconds can be used as touch sensible.
Concrete, provide video data drive signal step and common electrode driving circuit before public electrode wire provides show electrode drive signal step, also to comprise at data drive circuit to data line: to adjust switch switching unit, described data drive circuit is connected with data line, and described common electrode signal produces circuit and is connected with public electrode wire;
Then, gate driver circuit 300 provides the demonstration gate drive signal to gate line 161, open the TFT150 of each row successively, make the electrode and the public electrode wire 140 of first substrate of the drain electrode that connects TFT150 that voltage is added in the liquid crystal capacitance both sides that liquid crystal layer forms, thereby display panel is shown.
S2: gate driver circuit provides the touch-control gate drive signal to gate line, and the touch-control driving circuit provides identical touch-control drive signal to public electrode wire and data line.
With reference to figure 7, time period t 2 is the touch-control time, and concrete t2 is 3.6 milliseconds, provides the touch-control gate drive signal at time period t 2 inner grid driving circuits to gate line, and common electrode driving circuit provides identical touch-control drive signal to public electrode wire and data line.
Concrete, provide touch-control gate drive signal step and touch-control driving circuit before described public electrode wire and described data line provide identical touch-control drive signal, also to comprise at gate driver circuit to gate line: to adjust switch switching unit, described touch-control driving circuit is connected with data line, described touch-control driving circuit is connected with public electrode wire.
Because electromotive force keep to equate on public electrode wire 140 and the data line 162, thus the electric capacity between public electrode wire 140 and the data line 162 just to the signal on the public electrode wire without any influence, so this main parasitic electric capacity can be ignored.Here, the voltage on the data line 162 has played the effect of shielding, and its effect is identical with the screen layer effect that traditional surface capacitance touch-screen is adopted.
When finger touch, because finger causes that electric field changes near the node, thereby the mutual capacitance value 142b that the 142a of node place of every public electrode wire 140 and touch induction lines 142 forms changes.So detect the output signal of each node 142a correspondence, just can obtain touch location accurately.
In the foregoing description because with time of touch control operation and display operation separately, therefore do not disturb mutually, and when touch control operation, the voltage that data line and public electrode wire are added equates, therefore greatly reduces stray capacitance, is that the detection of touch location is more accurate.Simultaneously, because the time of touch control operation and display operation is separated, therefore also reduced of the influence of the signal of touch control manner to display quality.In other embodiments, if touch-screen is a resistive touch screen, then common electrode driving circuit is a DC voltage to the touch-control drive signal that described data line and described public electrode wire provide.Noise by stray capacitance importing touch signal is reduced greatly.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.
Though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention.Any those of ordinary skill in the art, do not breaking away under the technical solution of the present invention scope situation, all can utilize the method and the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention, all still belongs in the scope of technical solution of the present invention protection any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (13)
1. touch-screen comprises:
Display panel comprises first substrate staggered relatively, second substrate, has the plural groups public electrode wire on described second substrate; Described first substrate has the thin film transistor (TFT) of array discharging on a side of second substrate, wherein the grid of the described thin film transistor (TFT) of each row is connected on the gate line, and each source electrode that is listed as described thin film transistor (TFT) is connected on the data lines; It is characterized in that described touch-screen also comprises:
Data drive circuit is connected with described data line, is used for providing the video data drive signal to described data line under display mode;
Gate driver circuit is connected with described gate line, is used under display mode providing to described gate line showing gate drive signal and providing the touch-control gate drive signal to described gate line during at control mode touch mode;
Common electrode signal produces circuit, is connected with described public electrode wire, is used for providing the demonstration common electrode signal to described public electrode wire under display mode;
The touch-control driving circuit is connected with described data line and described public electrode wire, is used for providing identical touch-control drive signal to described data line and described public electrode wire under control mode touch mode.
2. touch-screen according to claim 1 is characterized in that described data drive circuit is connected with data line by switch switching unit; The touch-control driving circuit is connected with described data line by the change-over switch unit.
3. touch-screen according to claim 2 is characterized in that the touch-control driving circuit also is connected with data line by follower.
4. touch-screen according to claim 2 is characterized in that, described touch-screen is a resistive touch screen, and described touch-control drive signal is a DC voltage.
5. touch-screen according to claim 2 is characterized in that, described touch-screen is a capacitive touch screen, and described touch-control drive signal is an alternating voltage.
6. touch-screen according to claim 1 is characterized in that, described public electrode wire is a strip, described public electrode wire, and the interval between the adjacent described gate line is oppositely arranged.
7. touch-screen according to claim 6 is characterized in that, the public electrode wire of every group of strip is made of at least two strip public electrode wires that are connected.
8. the driving method of a touch-screen is characterized in that, comprises step:
Under display mode, data drive circuit provides the video data drive signal to data line, and gate driver circuit provides the demonstration gate drive signal to gate line, and common electrode signal produces circuit and provides the show electrode drive signal to public electrode wire;
Under control mode touch mode, gate driver circuit provides the touch-control gate drive signal to gate line, and the touch-control driving circuit provides identical touch-control drive signal to described public electrode wire and described data line.
9. driving method according to claim 8 is characterized in that described data drive circuit is connected with data line by switch switching unit; The touch-control driving circuit is connected with described data line by switch switching unit;
Provide video data drive signal step and common electrode driving circuit before public electrode wire provides show electrode drive signal step, also to comprise at data drive circuit to data line: to adjust switch switching unit, described data drive circuit is connected with data line, and described common electrode signal produces circuit and is connected with public electrode wire;
Provide touch-control gate drive signal step and touch-control driving circuit before described public electrode wire and described data line provide identical touch-control drive signal, also to comprise at gate driver circuit to gate line: to adjust switch switching unit, described touch-control driving circuit is connected with data line, described touch-control driving circuit is connected with public electrode wire.
10. driving method according to claim 9 is characterized in that, described touch-control gate drive signal is to make all thin film transistor (TFT)s all be in the voltage signal of closed condition.
11. driving method according to claim 10 is characterized in that, video data drive signal, gate drive signal, show electrode drive signal, touch-control gate drive signal and touch-control drive signal are voltage signal.
12. driving method according to claim 11 is characterized in that, described touch-control gate drive signal is a negative voltage signal.
13. a liquid crystal indicator is characterized in that, comprises as each described touch-screen among the claim 1-7.
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| CN 200910049590 CN101866228B (en) | 2009-04-17 | 2009-04-17 | Touch screen, liquid crystal display device and driving method of touch screen |
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| CN 200910049590 CN101866228B (en) | 2009-04-17 | 2009-04-17 | Touch screen, liquid crystal display device and driving method of touch screen |
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