CN102193700A - Touch screen - Google Patents
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- CN102193700A CN102193700A CN2010101302320A CN201010130232A CN102193700A CN 102193700 A CN102193700 A CN 102193700A CN 2010101302320 A CN2010101302320 A CN 2010101302320A CN 201010130232 A CN201010130232 A CN 201010130232A CN 102193700 A CN102193700 A CN 102193700A
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Abstract
The invention discloses a touch screen which comprises a plurality of drive electrodes, a plurality of inductive electrodes and a detection circuit, wherein the drive electrodes are regularly arranged in rows, and the drive electrodes in each row are respectively electrically connected with a same peripheral drive wire; the inductive electrodes are arranged in lines and installed at intervals with the drive electrodes arranged in rows, and the inductive electrodes in a same line are respectively electrically connected with a same peripheral inductive wire; the detection circuit is respectively electrically connected with the drive electrodes in each row and the inductive electrodes in each line; and two adjacent inductive electrode and drive electrode are electrically connected by a connecting wire. In the invention, two adjacent inductive electrode and drive electrode are electrically connected by a connecting wire, so that the connecting wire is formed into a mutual resistor between the inductive electrode and the drive electrode, then the touch position is detected by using the influence of the mutual resistor on currents output before and after hand touch, and the resistance value of the mutual resistor is controlled according to the film thickness and the length-width ratio of the connecting wire, then a touch screen structure with the optimum control effect can be obtained.
Description
Technical field
The present invention relates to a kind of touch-screen.
Background technology
Touch-screen is a kind of touch sensing input media that is widely used now, and according to the touch sensible principle, the touch-screen of prior art comprises resistive touch screen, capacitive touch screen, surperficial infrared touch panel etc.Wherein, resistive touch screen is because low, the easy realization of its cost, control advantage such as simple are widely used; In recent years, capacitive touch screen is grown, can be realized the senior sophisticated functions of multiple spot contact with its transmittance height, wear-resistant, anti-variation of ambient temperature, life-span and is welcomed by the general public.Mutually appearance formula touch-screen is a kind of emerging technology in the capacitive touch screen, it to noise and over the ground stray capacitance the good restraining effect is arranged, and can realize real multiple point touching, therefore become the direction that each capacitive touch screen chip manufacturer assaults the main target.
Fig. 1 is the structural representation of the mutual appearance formula touch-screen of prior art; Fig. 2 a is the orthogonal projection synoptic diagram of Drive Layer; Fig. 2 b is the orthogonal projection synoptic diagram of inductive layer; with reference to figure 1; the mutual capacitance type touch-screen of prior art comprises glass substrate 10, is formed at indium tin oxide target (ITO) Drive Layer 11 on the glass substrate 10, is formed at the dielectric layer 12 on the Drive Layer 11; be formed at indium tin oxide target (ITO) inductive layer 13 on the dielectric layer 12, and be formed at the protective seam 14 on the inductive layer 13.With reference to figure 2a, Drive Layer 11 comprises a plurality of drive electrodes 111, and each drive electrode is the masonry type, and this a plurality of drive electrode 111 is regularly arranged, respectively by many parallel drive wire 11a, 11b, 11c, 11d ... be electrically connected; With reference to figure 2b, inductive layer 13 comprises a plurality of induction electrodes 131, each induction electrode is the masonry type, this a plurality of induction electrode 131 is regularly arranged, respectively by many parallel line of induction 13a, 13b, 13c, 13d ... be electrically connected, drive wire 11a, 11b, 11c, 11d ... with line of induction 13a, 13b, 13c, 13d ... orthogonal, every line of induction 13a, 13b, 13c, 13d ... be electrically connected with testing circuit 30 by gating switch module 20.Continuation forms mutual capacitance between over against induction electrode 131 and the drive electrode 111 mutually with reference to figure 1.In conjunction with reference to figure 2a and Fig. 2 b, the principle of work of touch-screen is: with drive wire 11a is that example describes, apply driving voltage 40 on the drive wire 11a, other drive wire 11b, 11c, 11d ... ground connection, line of induction 13a is connected with testing circuit 30 by gating switch module 20, that at this moment detect is drive wire 11a and line of induction 13a, finger touch has touching signals, then at the intersection point place of these two lines, by gating switch module 20 more successively with line of induction 13b, 13c, 13d ... link to each other with testing circuit 30, detect drive wire 11a and the line of induction 13b this moment, 13c, 13d ... the signal at intersection point place; Afterwards, give drive wire 11b, 11c, 11d ... apply driving voltage successively, turntable driving line 11b, 11c, 11d successively ... finish scanning process, so just with all drive wire 11a, 11b, 11c, 11d ... with all line of induction 13a, 13b, 13c, 13d ... all intersection point places scanned.Fig. 3 is the schematic equivalent circuit at the intersection point place of each bar drive wire and each bar line of induction, this equivalence circuit mainly comprises the circuit 50 that forms between the drive wire and the line of induction, when hand touches touch-screen with the finger mode equivalent electrical circuit 60 and the testing circuit 30 of drive wire, line of induction formation; Wherein capacitor C 1 is the mutual capacitance that intersection point place induction electrode 131 and drive electrode 111 form, capacitor C 2 and capacitor C 3 are respectively the stray capacitance that forms between drive wire, the line of induction and the ground, testing circuit 30 is current amplifiers, electric current on the line of induction is transformed into voltage signal output, when the finger touch touch screen, the mutual capacitance C1 of its touch point changes, and output current is changed, thereby output voltage is changed, thereby can detect touch point position.
The above is existing a kind of multilayer touch screen structure, and promptly Drive Layer and inductive layer are positioned at different layers, and Fig. 4 is a kind of Drive Layer of touch screen structure of individual layer of prior art and the orthogonal projection synoptic diagram of inductive layer.With reference to figure 4, the touch-screen of this individual layer, Drive Layer and inductive layer are positioned at same one deck, Drive Layer comprises a plurality of drive electrodes 71, and be regularly arranged into multirow drive electrode 71a, 71b, 71c ... do not link to each other between each drive electrode of each row, but make it to couple together at the drive wire of outer peripheral areas by the periphery; Inductive layer comprises a plurality of induction electrodes 72, and the drive electrode of induction electrode 72 and every row is provided with at interval, and each drive electrode 71 and adjacent induction electrode 72 form mutual capacitance, and its mutual capacitance equivalent electrical circuit equally also is an equivalent electrical circuit shown in Figure 3.
Summary of the invention
The problem that the present invention solves provides a kind of new touch screen structure, with different technological means, reaches constructed effect.
The invention provides a kind of touch-screen, comprise a plurality of drive electrodes, become ranks regularly arranged, be electrically connected with same peripheral driver line respectively with the drive electrode of delegation;
A plurality of induction electrodes become row to arrange, and are provided with at interval with the described drive electrode that becomes to be listed as, and the induction electrode of same row is electrically connected with the same peripheral line of induction respectively;
Testing circuit is electrically connected with the drive electrode of every row and the induction electrode of every row respectively;
Wherein, adjacent induction electrode and drive electrode are electrically connected by connecting line.
Optionally, also comprise many shielding lines, be formed between the adjacent every row drive electrode and every row induction electrode.
Optionally, described every shielding line comprises the multistage shielding line, and is electrically connected by bridging line between every section adjacent shielding line.
Optionally, described drive electrode and described induction electrode are formed at same one deck, and described connecting line and described drive electrode and described induction electrode are at same one deck, and described bridging line and described drive electrode, described induction electrode are at different layers.
Optionally, described shielding line ground connection.
Compared with prior art, the present invention has the following advantages:
The present invention is electrically connected adjacent induction electrode and drive electrode by connecting line, this connecting line has formed the mutual resistance between induction electrode and the drive electrode, utilize the big or small adversary of mutual resistance touch before and after the influence of size of current of output detect position of touch, the resistance that structure of the present invention can recently be controlled mutual resistance by the thickness and the length and width of connecting line is to obtain having the touch screen structure of Optimal Control effect.
Further the present invention is provided with shielding line between adjacent induction electrode and drive electrode, utilize shielding line to reduce the mutual capacitance that forms between adjacent induction electrode and the drive electrode, reduce the influence of mutual capacitance, select suitable mutual resistance to reach better control effect output current.
Description of drawings
Fig. 1 is the structural representation of the mutual appearance formula touch-screen of prior art.
Fig. 2 a is the orthogonal projection synoptic diagram of Drive Layer.
Fig. 2 b is the orthogonal projection synoptic diagram of inductive layer,
Fig. 3 is the schematic equivalent circuit at the intersection point place of each bar drive wire of touch-screen shown in Figure 1 and each bar line of induction.
Fig. 4 is a kind of Drive Layer of touch screen structure of individual layer of prior art and the orthogonal projection synoptic diagram of inductive layer.
Fig. 5 is the orthogonal projection structural representation of touch-screen of the present invention.
Fig. 5 a is the partial enlarged drawing of Fig. 5.
Fig. 6 is the schematic equivalent circuit of drive electrode of the present invention and induction electrode junction.
Fig. 7 is the graph of relation of the resistance size of signal ratio and mutual resistance.
Fig. 8 is along the sectional view of a-a direction among Fig. 5 a.
Embodiment
The touch-screen of the specific embodiment of the invention, adjacent induction electrode and drive electrode are electrically connected by connecting line, this connecting line has formed the mutual resistance between induction electrode and the drive electrode, the electric current of touch-screen output was influential before and after the big or small adversary of mutual resistance touched, utilize the resistance of the thickness and the length breadth ratio control mutual resistance of connecting line, the touch screen structure that can obtain having the Optimal Control effect.
Fig. 5 is the orthogonal projection structural representation of touch-screen of the present invention, with reference to figure 5, touch-screen of the present invention comprises a plurality of drive electrodes 81, regularly arranged, form several rows drive electrode 81a, 81b ... drive electrode with delegation is electrically connected with same peripheral driver line respectively, be specially: the drive electrode 81a that is positioned at delegation is connected with drive wire drive1, the drive electrode 81b that is positioned at delegation is connected with drive wire drive2, and the like, only express five-element's drive electrode and five peripheral driver lines in Fig. 5, in concrete application, the quantity of peripheral driver line and the line number of drive electrode can be provided with different quantity according to the demand of actual touch screen; A plurality of induction electrodes 82, become row to arrange, be provided with at interval with the described drive electrode 81 that is positioned at same row, the induction electrode of same row is electrically connected with the same peripheral line of induction respectively, be specially: be connected with line of induction sense1, sense2, sense3 and sense4 respectively, only express four peripheral lines of induction in Fig. 5, in concrete application, the quantity of the line of induction and the columns of induction electrode can be provided with different quantity according to the demand of actual touch screen; The testing circuit (not shown), be electrically connected with the drive electrode 81 of every row and the induction electrode 82 of every row respectively, this testing circuit is same as the prior art, and connected mode is also same as the prior art, therefore do not do at this and give unnecessary details, specifically can be referring to Fig. 2 b in the background technology; With reference to partial enlarged drawing Fig. 5 a of figure 5, adjacent induction electrode 81 and drive electrode 82 are electrically connected by connecting line 83, have formed mutual resistance by connecting line 83 between adjacent induction electrode 81 and drive electrode 82.In the specific embodiment of the invention, described each induction electrode is a row induction electrode, and in other embodiments, a row induction electrode also can have a plurality of induction electrodes as prior art.Described induction electrode does not connect each other in the workspace, is electrically connected with the peripheral driver line in outer peripheral areas, in other embodiments, the drive electrode of same row is connected in the perform region.
The present invention adopts is actually a kind of " mutual resistance " touch-control structure, Fig. 6 is the schematic equivalent circuit of drive electrode of the present invention and induction electrode junction, the drive wire of this equivalent circuit and prior art shown in Figure 3 and the equivalent electrical circuit difference of line of induction intersection are: the mutual capacitance C1 among Fig. 3 is mutual resistance R6 in the present invention, and other structures are constant.This equivalence circuit mainly comprises the circuit 84 that forms between the drive wire and the line of induction, when hand touches touch-screen with the finger mode equivalent electrical circuit 85 and the testing circuit 30 of drive wire, line of induction formation; The circuit 84 that forms between the drive wire and the line of induction mainly comprises the stray capacitance C2 between resistance R 1, drive wire and the ground on the drive wire, the stray capacitance C3 between resistance R 2, the line of induction and the ground on the line of induction and connect mutual resistance R6 on the connecting line of drive electrode and induction electrode; Resistance R 3 when finger mode equivalent electrical circuit 85 mainly comprises the finger touch screen between finger and drive wire and the line of induction, R4 and capacitor C 4, C5, resistance R 5 between human body and the ground and capacitor C 6; Testing circuit 30 is a current amplifier, and is same as the prior art, and the electric current on the line of induction is transformed into voltage signal output.
(output current during touch-output current when not touching)/(output current when not touching) is defined as signal ratio, in the specific embodiment of the invention, the sine wave of getting 20 megahertzes is as drive signal, peak value is 10V, R1=R2=5 ohm, the C2=C3=500 pico farad, the C4=C5=1 pico farad, R3=R4=1 kilo-ohm, R5=1.5 kilo-ohm, the C6=100 pico farad utilizes circuit simulating software (for example Spice software) can obtain the graph of relation of the resistance size of signal ratio shown in Figure 7 and mutual resistance R6, signal ratio is an ordinate among Fig. 7, and mutual resistance R6 is a horizontal ordinate.Need to prove, at this parameter of getting " sine wave drive signal of 20 megahertzes; peak value is 10V; R1=R2=5 ohm; the C2=C3=500 pico farad; the C4=C5=1 pico farad; R3=R4=1 kilo-ohm, R5=1.5 kilo-ohm, the C6=100 pico farad " be an instantiation of each parameter of equivalent electrical circuit of common drive electrode and induction electrode junction, in other examples, in " drive signal, resistance R 1 on the touch sensing drive wire, resistance R 2 on the line of induction, the resistance R 3 between the drive wire and the line of induction, R4 and capacitor C 4, C5, the resistance R 5 between human body and the ground, and capacitor C 6 " when these parameters are got other values; the curve of resulting signal ratio and mutual resistance R6 relation is identical with the variation tendency of curve shown in Figure 7, so can the reflected signal ratio and the relation of mutual resistance R6 at this parameter value of getting.Can declare according to the curve shown in Fig. 7 and to know, when mutual resistance R6 when infinity reduces gradually, signal ratio can reduce gradually from positive dirction, just when mutual resistance R6 is enough big, touch the signal of back signal when not touching, but after mutual resistance R6 is reduced to a certain degree, signal ratio can be reduced to 0, and continue to be reduced to negative, just this moment, touch signal was less than touch signal not, when mutual resistance R6 continues to reduce, the absolute value of signal ratio can reduce, level off to 0 at last, when mutual resistance R6 equals a certain resistance (being about 40 kilo-ohms shown in Fig. 7), signal ratio reaches the maximal value of negative sense.Utilize this phenomenon, obtained " mutual resistance induction " touch-control structure of the present invention,, can obtain the touch-screen of touch-control best results by the size of suitable selection mutual resistance R6.
Continuation is with reference to figure 5, and with reference to figure 5a and Fig. 8, touch-screen of the present invention also comprises many shielding lines 90, is formed at the gap of every row drive electrode and every row induction electrode, described shielding line ground connection; In specific embodiments of the invention, described every shielding line comprises multistage shielding line 91, with reference to figure 5a, and be electrically connected by bridging line 92 between adjacent every section shielding line 91, this shielding line 90 shields adjacent drive electrode 81 and induction electrode 82 mutually, reduce the mutual capacitance between adjacent drive electrode 81 and the induction electrode 82, mutual capacitance is reduced the influence of output signal.Certainly, in other embodiments of the invention, also can not have shielding line, just the touch-control effect can not reach optimum efficiency.
Continuation is with reference to figure 5, and with reference to partial enlarged drawing Fig. 5 a and Fig. 8 of figure 5, the touch-screen of the specific embodiment of the invention, described drive electrode 81 and described induction electrode 82 are formed at same one deck, described connecting line 83 and described drive electrode 81 and described induction electrode 82 are at same one deck, described bridging line 92 and described drive electrode 81, described induction electrode 82 are at different layers, be formed with insulation course 93 between described bridging line 92 and the described connecting line 83, the insulation that this insulation course 93 guarantees between shielding line 90 and the connecting line 83.
With reference to figure 8, the resistance that thickness and length breadth ratio by control linkage line 83 can change mutual resistance R6, therefore select the thickness of suitable connecting line 83 and the size that length breadth ratio can be selected suitable mutual resistance R6, be preferably according to curve map shown in Figure 7, selection makes the absolute value of signal ratio be maximum mutual resistance resistance, thereby obtains best touch-control effect.
The touch-screen of the specific embodiment of the invention, adjacent induction electrode is connected by connecting line with drive electrode, this connecting line has formed the mutual resistance between induction electrode and the drive electrode, the electric current of touch-screen output was influential before and after the big or small adversary of mutual resistance touched, utilize the resistance of the thickness and the length breadth ratio control mutual resistance of connecting line, the touch screen structure that can obtain having the Optimal Control effect.
The above only is specific embodiments of the invention; in order to make those skilled in the art better understand spirit of the present invention; yet protection scope of the present invention is not a limited range with the specific descriptions of this specific embodiment; any those skilled in the art is in the scope that does not break away from spirit of the present invention; can make an amendment specific embodiments of the invention, and not break away from protection scope of the present invention.
Claims (8)
1. a touch-screen comprises a plurality of drive electrodes, becomes ranks regularly arranged, is electrically connected with same peripheral driver line respectively with the drive electrode of delegation;
A plurality of induction electrodes become row to arrange, and are provided with at interval with the described drive electrode that becomes to be listed as, and the induction electrode of same row is electrically connected with the same peripheral line of induction respectively;
Testing circuit is electrically connected with the drive electrode of every row and the induction electrode of every row respectively;
It is characterized in that adjacent induction electrode and drive electrode are electrically connected by connecting line.
2. touch-screen as claimed in claim 1 is characterized in that, also comprises many shielding lines, is formed between the adjacent every row drive electrode and every row induction electrode.
3. touch-screen as claimed in claim 2 is characterized in that, described every shielding line comprises the multistage shielding line, and is electrically connected by bridging line between every section adjacent shielding line.
4. touch-screen as claimed in claim 3, it is characterized in that, described drive electrode and described induction electrode are formed at same one deck, and described connecting line and described drive electrode and described induction electrode are at same one deck, and described bridging line and described drive electrode, described induction electrode are at different layers.
5. touch-screen as claimed in claim 3 is characterized in that, described shielding line ground connection.
6. touch-screen as claimed in claim 4 is characterized in that, is formed with insulation course between described shielding line and the described connecting line.
7. as each described touch-screen of claim 1～6, it is characterized in that described each induction electrode is a row induction electrode.
8. touch-screen as claimed in claim 7 is characterized in that, described induction electrode is electrically connected with the peripheral driver line in outer peripheral areas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010130232.0A CN102193700B (en) | 2010-03-15 | 2010-03-15 | Touch screen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010130232.0A CN102193700B (en) | 2010-03-15 | 2010-03-15 | Touch screen |
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| CN102193700A true CN102193700A (en) | 2011-09-21 |
| CN102193700B CN102193700B (en) | 2015-07-08 |
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| CN201010130232.0A Active CN102193700B (en) | 2010-03-15 | 2010-03-15 | Touch screen |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102402358A (en) * | 2011-11-25 | 2012-04-04 | 苏州瀚瑞微电子有限公司 | Touch screen and positioning method |
| CN103513837A (en) * | 2012-06-29 | 2014-01-15 | 上海天马微电子有限公司 | Mutual capacitance type touch structure, touch panel and touch display panel |
| WO2015081719A1 (en) * | 2013-12-04 | 2015-06-11 | 深圳市汇顶科技股份有限公司 | Touch detection system, detection method thereof, and touch screen terminal |
| CN104750347A (en) * | 2015-04-17 | 2015-07-01 | 合肥京东方光电科技有限公司 | Capacitive touch screen, production technology for same and touch display panel |
| WO2015192597A1 (en) * | 2014-06-16 | 2015-12-23 | 京东方科技集团股份有限公司 | Touch panel and driving method therefor and display device |
| CN106226961A (en) * | 2016-09-29 | 2016-12-14 | 深圳市华星光电技术有限公司 | A kind of COA array base palte and display device |
| WO2018006500A1 (en) * | 2016-07-03 | 2018-01-11 | 深圳贝特莱电子科技股份有限公司 | Functional single-layer multi-point touch sheet and method for acquiring touch coordinates |
| WO2022051957A1 (en) * | 2020-09-10 | 2022-03-17 | 京东方科技集团股份有限公司 | Display device, touch panel and manufacturing method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102402358A (en) * | 2011-11-25 | 2012-04-04 | 苏州瀚瑞微电子有限公司 | Touch screen and positioning method |
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| WO2018006500A1 (en) * | 2016-07-03 | 2018-01-11 | 深圳贝特莱电子科技股份有限公司 | Functional single-layer multi-point touch sheet and method for acquiring touch coordinates |
| CN106226961A (en) * | 2016-09-29 | 2016-12-14 | 深圳市华星光电技术有限公司 | A kind of COA array base palte and display device |
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| WO2022051957A1 (en) * | 2020-09-10 | 2022-03-17 | 京东方科技集团股份有限公司 | Display device, touch panel and manufacturing method therefor |
| US11740743B2 (en) | 2020-09-10 | 2023-08-29 | Hefei Xinsheng Optoelectronics Technology Co., Ltd. | Display device, touch panel and manufacturing method thereof |
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|---|---|
| CN102193700B (en) | 2015-07-08 |
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