CN102541330B - Touch control screen and touch control display device - Google Patents
Touch control screen and touch control display device Download PDFInfo
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- CN102541330B CN102541330B CN201010615800.6A CN201010615800A CN102541330B CN 102541330 B CN102541330 B CN 102541330B CN 201010615800 A CN201010615800 A CN 201010615800A CN 102541330 B CN102541330 B CN 102541330B
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Abstract
The invention provides a touch control screen, which comprises a first substrate, wherein a touch control structural layer, an insulated medium layer and a public electrode layer are formed on the first substrate in turn; the touch control structural layer is a single-layer capacitive touch control structure and comprises a plurality of driving electrodes and a plurality of sensing electrodes, which are arranged in a strip shape at intervals; the public electrode layer comprises a plurality of first public electrodes opposite to the driving electrodes and a plurality of second public electrodes opposite to the sensing electrodes; and first resistors are coupled between first public electrodes and a grounded terminal, and second resistors are coupled between the second public electrodes and a second resistor. The first and second resistors are coupled between driving and sensing grounds and the grounded terminal in the touch screen respectively, and thus, the touch control signal is optimized.
Description
Invention field
The present invention relates to technical field of touch control, particularly relate to a kind of embedded mutual capacitance induction touch panel and the touch control display apparatus comprising this touch-screen.
Background technology
At present, different from the combination of liquid crystal indicator according to touch-screen, touch-screen can be divided into two kinds, and one is external hanging type touch-screen, and another kind is In-cell touch panel.
Together with external hanging type touch-screen and display unit are separated and are manufactured and be then produced on by the mode of assembling.Thickness of displays certainly will be increased like this, and owing to adding some layers of clear glass or film, display transparent rate and contrast also obviously can decline.This way cost is also higher in addition.
In order to make the LCD display device with touch-screen more frivolous, have better display effect and cost advantage, In-cell touch panel (In-cell touch panel) has been born.Fig. 1 is the touch control display apparatus structural representation of the employing In-cell touch panel of prior art.
As shown in Figure 1, this touch control display apparatus comprises In-cell touch panel 200, the infrabasal plate 27 be oppositely arranged with In-cell touch panel 200; Be arranged at the liquid crystal layer 29 between In-cell touch panel 200 and second substrate 27; Infrabasal plate 27 is provided with thin film transistor (TFT) (TFT) array layer 28 towards the surface of liquid crystal layer 29.
In-cell touch panel 200 comprises first substrate 26, is formed at the touch-control structure layer 21 on first substrate 26 successively, insulating medium layer 22 and common electrode layer 23;
Wherein, first substrate 26 and second substrate 27 can adopt glass substrate, and common electrode layer 23 can be ITO layer, and insulating medium layer 22 can be color filter film.
The touch-control structure layer 21 of prior art can be single-layer capacitive touch structure (as Fig. 2).As can be seen from Figure 2, this touch-control structure layer 21 comprises multiple drive electrode of the arrangement in striped stride and multiple induction electrode 2a, 2b, 2c, 2d.Each drive electrode is by electrode 1a ' separated from one another, and 1b ', 1c ', 1d ', 1e ' are formed; Electrode 1a ' in each drive electrode is in the working region of touch-screen by multiple induction electrode 2a, and 2b, 2c, 2d separate, and link together in outer peripheral areas, common formation drive wire 1a; Electrode 1b ' in each same drive electrode, 1c ', 1d ', 1e ' is also like this, forms drive wire 1b respectively, 1c, 1d, 1e.Such drive wire 1a, 1b, 1c, 1d, 1e still with induction electrode 2a, 2b, 2c, 2d define matrix structure.The infall of every bar drive wire 1 and induction electrode 2 defines mutual capacitance 12.
There is a problem in the In-cell touch panel 200 of prior art: the spacing very near (only having several micron) of touch-control structure layer 21 and common electrode layer 23, therefore between them, electric capacity can be very large.In prior art In-cell touch panel 200, the equivalent circuit of the infall of each drive wire 1 and induction electrode 2 as shown in Figure 3.Each infall has been coupled a mutual capacitance 12.Drive wire 1 and induction electrode 2 have parasitic capacitance 13 over the ground, and source driving signal 3 provides drive singal; Testing circuit 6 is charge amplifiers, the electric current 14 on induction electrode is transformed into voltage signal 15 and exports.When finger touch, mutual capacitance 12 changes, and so just causes output current 14 to change, thus output voltage 15 is changed.
Due in In-cell touch panel 200 structure, parasitic capacitance 13 is often very large, can produce interfering signal 18, ineffective to touch control detection.At this moment, the resistance 16 of common electrode layer 23 and inductance 17 just can not have been ignored.Proved by analog simulation, when parasitic capacitance 13 reaches 500pF, as long as the inductance of the resistance of 2 ohm 16 and 50 nanohenry just can produce extremely adverse influence to touching signals, and so small resistance and inductance are substantially unavoidable.
For this problem above, there is a kind of solution, exactly common electrode layer 23 is divided multiple strip shaped electric poles (as shown in Figure 4).Common electrode layer 23 comprises multiple first public electrode 24 of the arrangement in striped stride and multiple second public electrode 25; First public electrode 24 comprises public electrode 24a, 24b, 24c and 24d; First public electrode 25 comprises public electrode 25a, 25b, 25c and 25d.Multiple first public electrodes 24 and multiple drive electrode, just to setting, each is by electrode 1a ', 1b ', 1c ', 1d ', the drive electrode that 1e ' is formed respectively with public electrode 24a, 24b, 24c, 24d of the first public electrode 24 on printing opacity direction just to setting, preferably overlap; Induction electrode 2a, 2b, 2c, 2d respectively with public electrode 25a, 25b, 25c, 25d of the second public electrode 25 on printing opacity direction just to setting, preferably overlap.The public electrode 24a of the first public electrode 24,24b, 24c, 24d are in outer peripheral areas and be couple to earth terminal after connecing; Public electrode 25a, 25b, 25c, 25d of second public electrode 25 are in outer peripheral areas and be couple to earth terminal after connecing.
Now, in In-cell touch panel 200, the equivalent circuit of each drive wire 1 and the infall of induction electrode 2 is as shown in Figure 5.In Fig. 5, the parasitic capacitance 13 of drive wire 1 and the first public electrode 24 passes through resistance and inductance 19 ground connection of the first public electrode; The parasitic capacitance 13 of induction electrode 2 and the second public electrode 25 passes through resistance and inductance 20 ground connection of the second public electrode.
All first public electrodes 24 corresponding with drive electrode can be defined as and drive ground, all second public electrodes 25 corresponding with induction electrode are defined as inductively.Drive the resistance on ground and inductance 19 and drive the resistance on ground and inductance 20 still can impact detection signal, making detection signal can not reach optimum.
Summary of the invention
Technical problem to be solved of the present invention is in existing In-cell touch panel, drive the resistance on ground and inductance and resistance inductively and inductance to impact detection signal, makes detection signal can not reach optimum.
In order to solve the problems of the technologies described above, the invention provides a kind of touch-screen, comprising first substrate, be formed at the touch-control structure layer on described first substrate successively, insulating medium layer and common electrode layer; Described touch-control structure layer is single-layer capacitive touch structure, comprises multiple drive electrode of the arrangement in striped stride and multiple induction electrode; Described common electrode layer comprise multiple and described drive electrode just to the first public electrode arranged and multiple and described induction electrode just to the second public electrode arranged; Couple the first resistance between described multiple first public electrode and earth terminal, between described multiple second public electrode and earth terminal, couple the second resistance.
Preferably, described first resistance and described second resistance are under the driving frequency of described touch-screen, the resistance corresponding to maximum of signal intensity ratio.Described signal intensity ratio
Preferably, the driving frequency of described touch-screen is taken as 10MHz-20MHz, the resistance of described multiple first public electrode and the resistance sum of described first resistance are 100-200 ohm, and the resistance of described multiple second public electrode and the resistance sum of described second resistance are 100-200 ohm.
Further, the driving frequency of described touch-screen is taken as 10MHz, the resistance of described multiple first public electrode and the resistance sum of described first resistance are 100 ohm, and the resistance of described multiple second public electrode and the resistance sum of described second resistance are 100 ohm.
Preferably, described multiple first public electrode and described multiple second public electrode are that striped stride arranges.
Preferably, described common electrode layer is ITO layer.
Preferably, described touch-screen also comprises a FPC, and described first resistance and the second resistance are arranged on described FPC.
Preferably, described FPC is arranged a touch chip, described multiple first public electrode is also connected with described touch chip by described first resistance after connecing, and described multiple second public electrode is also connected with described touch chip by described second resistance after connecing.
Present invention also offers a kind of touch control display apparatus, comprise above-mentioned touch-screen, described touch control display apparatus also comprises: the second substrate be oppositely arranged with described touch-screen; Be arranged at the liquid crystal layer between described touch-screen and described second substrate; Described second substrate is provided with thin film transistor array layer towards the surface of described liquid crystal layer.
Preferably, the insulating medium layer in described touch-screen is color filter film.
By technique scheme, advantage and the beneficial effect of touch-screen of the present invention are: drive ground and inductively and achieve the optimization of touching signals after coupling the first resistance, the second resistance between earth terminal respectively in In-cell touch panel.
Accompanying drawing explanation
Accompanying drawing shows embodiments of the invention, and together with description, is used for explaining principle of the present invention.By the detailed description done below in conjunction with accompanying drawing, can more clearly understand object of the present invention, advantage and feature, wherein:
Fig. 1 is the touch control display apparatus structural representation of prior art;
Fig. 2 is the single-layer capacitive touch structural representation of prior art;
Fig. 3 is the equivalent circuit diagram of drive wire and induction electrode infall in prior art In-cell touch panel;
Fig. 4 is common electrode layer structural representation with comprising driving and inductively;
Fig. 5 is the equivalent circuit diagram of drive wire and induction electrode infall in the In-cell touch panel comprising common electrode layer shown in Fig. 4;
Fig. 6 is that the common electrode layer of the embodiment of the present invention 1 is by resistance eutral grounding schematic diagram;
Fig. 7 is the drive wire of the embodiment of the present invention 1 and the equivalent circuit of induction electrode infall;
Fig. 8 is signal intensity ratio analogous diagram of the present invention;
Fig. 9 is the In-cell touch panel structural representation comprising FPC of the embodiment of the present invention 2.
Detailed description of the invention
For describing technology contents of the present invention and structural feature in detail, accompanying drawing is coordinated to be described in detail below in conjunction with embodiment.
As mentioned above, the In-cell touch panel 200 in the touch control display apparatus (as shown in Figure 1) of prior art comprises first substrate 26, is formed at the touch-control structure layer 21 on first substrate 26 successively, insulating medium layer 22 and common electrode layer 23; Touch-control structure layer 21 can be single-layer capacitive touch structure (as Fig. 2); Common electrode layer 23 comprises multiple first public electrode 24 of the arrangement in striped stride and multiple second public electrode 25 (as shown in Figure 4).But the resistance of the resistance of prior art first public electrode 24 and inductance 19 and the second public electrode 25 and inductance 20 can impact detection signal, make detection signal can not reach optimum.
Embodiment 1
In order to the resistance of the resistance and inductance 19 and the second public electrode 25 that reduce the first public electrode 24 and inductance 20 can impact detection signal, optimum detection signal; As shown in Figure 6, in public electrode 23 of the present invention, public electrode 24a, 24b, 24c, 24d of the first public electrode 24 connect together, and then between the first public electrode 24 and earth terminal, couple first resistance 32; In public electrode 23, public electrode 25a, 25b, 25c, 25d of the second public electrode 25 connect together, and then between the second public electrode 25 and earth terminal, couple second resistance 31.
Couple the first resistance, the second resistance respectively between the first public electrode 24, second public electrode 25 and earth terminal after, the drive wire 1 of In-cell touch panel 200 and the equivalent circuit of induction electrode 2 infall are as shown in Figure 7.As shown in Figure 7, coupling capacitance 30 can be there is between the first public electrode 24 and the second public electrode 25; Also there is resistance 16 ' and inductance 17 ' in actual earth terminal.Emulate the model set up according to Fig. 7, its result as shown in Figure 8.
It is constant that the resistance of the first public electrode 24 and the resistance of inductance 19, second public electrode 25 and inductance 20 are set to fixed value; Change the first resistance 31 and the value of the second resistance 32 and the frequency of driving voltage 3, obtain the ratio 35 that detection signal 15 changes.
The account form of the ratio 35 that detection signal 15 changes is:
Resistance sum Rdg (or resistance sum Rsg of the second resistance 32 and the second public electrode 25) and the signal of the first resistance 31 and the first public electrode 24 change the relation of ratio 35 as shown in Figure 8.Can find out, signal change ratio 35 has a maximum with resistance sum Rdg (or resistance sum Rsg of the second resistance 32 and the second public electrode 25) increase of the first resistance 31 and the first public electrode 24.Corresponding different driving frequencies, the resistance sum Rsg of the first resistance 31 corresponding to this maximum and the resistance sum Rdg of the first public electrode 24 and the second resistance 32 and the second public electrode 25) different, the size of the first resistance 31 and the second resistance 32 is also different.Frequency is larger, and the resistance value obtaining maximum touching signals is also larger.Because frequency can not infinitely increase, high-frequency can produce larger power consumption, also has high-frequency effects in addition and signal is reduced, so the first resistance 31 and the second resistance 32 also can not be infinitely great.Therefore we choose a more suitable frequency band, and as 10MHz-20MHz, a corresponding resistance 31 and the value of the resistance sum Rdg of the first public electrode 24 and the resistance sum Rsg of the second resistance 32 and the second public electrode 25 are 100 ohm to 200 ohm.
As can be seen from the simulation result shown in Fig. 8, after extra increase by first resistance 31 and the second resistance 32, the resistance of resistance 31 and 32 is fixed according to driving frequency, as driving frequency be 10MHz time, the resistance sum Rdg making the first resistance 31 and the first public electrode 24 is 100 ohm, and the resistance sum Rsg making the second resistance 32 and the second public electrode 25 is 100 ohm.So just can realize the maximization of touching signals.
For the In-cell touch panel that has prepared, in order to choose the first resistance 31 and the second resistance 32 of suitable size, need under the driving frequency of this In-cell touch panel, regulate the size of the first resistance 31 and the second resistance 32, obtain the change curve of signal intensity ratio 35 and the first resistance 31, second resistance 32, choose first resistance 31 and second resistance 32 corresponding to maximum of signal intensity ratio 35.
Embodiment 2
As one preferred embodiment, the first resistance 31 and the second resistance 32 can be arranged on FPC by In-cell touch panel of the present invention.As shown in Figure 9, the first public electrode 24 of this In-cell touch panel 37 and the second public electrode 25 are drawn by FPC 38.FPC 38 has touch chip 39, and the first public electrode 24 and the second public electrode 25 are connected to touch chip 39 and are grounded.
The structure of this In-cell touch panel 37 is identical with the structure of the In-cell touch panel 200 in Fig. 1, also comprises first substrate 26, is formed at the touch-control structure layer 21 on first substrate 26 successively, insulating medium layer 22 and common electrode layer 23; Touch-control structure layer 21 is single-layer capacitive touch structure (as Fig. 2); Common electrode layer 23 comprises multiple first public electrode 24 of the arrangement in striped stride and multiple second public electrode 25 (as shown in Figure 4).
Touch control display apparatus provided by the invention comprises the In-cell touch panel shown in Fig. 9, and comprises the second substrate be oppositely arranged with this In-cell touch panel; Be arranged at the liquid crystal layer between this In-cell touch panel and this second substrate; Second substrate is provided with thin film transistor array layer towards the surface of liquid crystal layer.
These are only the preferred embodiments of the present invention, be not limited to the present invention.In the above-described embodiments, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a touch-screen, comprises first substrate, it is characterized in that, described touch-screen also comprises the touch-control structure layer be formed at successively on described first substrate, insulating medium layer and common electrode layer;
Described touch-control structure layer is single-layer capacitive touch structure, comprises multiple drive electrode of the arrangement in striped stride and multiple induction electrode;
Described common electrode layer comprise multiple and described drive electrode just to the first public electrode arranged and multiple and described induction electrode just to the second public electrode arranged;
Couple the first resistance between described multiple first public electrode and earth terminal, between described multiple second public electrode and earth terminal, couple the second resistance.
2. touch-screen according to claim 1, is characterized in that, described first resistance and described second resistance are under the driving frequency of described touch-screen, the resistance corresponding to maximum of signal intensity ratio, described in
3. touch-screen according to claim 2, it is characterized in that, the driving frequency of described touch-screen is 10MHz-20MHz, the resistance of described multiple first public electrode and the resistance sum of described first resistance are 100-200 ohm, and the resistance of described multiple second public electrode and the resistance sum of described second resistance are 100-200 ohm.
4. touch-screen according to claim 3, it is characterized in that, the driving frequency of described touch-screen is 10MHz, the resistance of described multiple first public electrode and the resistance sum of described first resistance are 100 ohm, and the resistance of described multiple second public electrode and the resistance sum of described second resistance are 100 ohm.
5. touch-screen according to claim 1, is characterized in that, described multiple first public electrode and described multiple second public electrode are that striped stride arranges.
6. touch-screen according to claim 1, is characterized in that, described common electrode layer is ITO layer.
7. the touch-screen according to any one of claim 1-6, is characterized in that, described touch-screen also comprises a FPC, and described first resistance and the second resistance are arranged on described FPC.
8. touch-screen according to claim 7, it is characterized in that, described FPC is arranged a touch chip, described multiple first public electrode is also connected with described touch chip by described first resistance after connecing, and described multiple second public electrode is also connected with described touch chip by described second resistance after connecing.
9. a touch control display apparatus, comprises the touch-screen as described in any one of claim 1-8,
It is characterized in that, described touch control display apparatus also comprises:
The second substrate be oppositely arranged with described touch-screen;
Be arranged at the liquid crystal layer between described touch-screen and described second substrate;
Described second substrate is provided with thin film transistor array layer towards the surface of described liquid crystal layer.
10. touch-screen according to claim 9, is characterized in that, the insulating medium layer in described touch-screen is color filter film.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010615800.6A CN102541330B (en) | 2010-12-27 | 2010-12-27 | Touch control screen and touch control display device |
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| CN201010615800.6A CN102541330B (en) | 2010-12-27 | 2010-12-27 | Touch control screen and touch control display device |
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| CN102541330B true CN102541330B (en) | 2015-04-29 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| TWI522876B (en) * | 2014-01-22 | 2016-02-21 | Sitronix Technology Corp | Drive circuit and its touch device and touch module and manufacturing method |
| CN106341109A (en) * | 2016-08-31 | 2017-01-18 | 天安电气集团浙江电气有限公司 | Concise rigid touch induction circuit |
| CN112799551B (en) * | 2021-01-20 | 2024-03-15 | 京东方科技集团股份有限公司 | Touch module, positioning detection method thereof and touch panel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5410329A (en) * | 1992-05-22 | 1995-04-25 | Sharp Kabushiki Kaisha | Display-integrated type tablet device |
| CN101174038A (en) * | 2006-11-01 | 2008-05-07 | 群康科技(深圳)有限公司 | LCD device |
| CN101681221A (en) * | 2008-03-28 | 2010-03-24 | 索尼株式会社 | Display device provided with touch sensor |
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- 2010-12-27 CN CN201010615800.6A patent/CN102541330B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5410329A (en) * | 1992-05-22 | 1995-04-25 | Sharp Kabushiki Kaisha | Display-integrated type tablet device |
| CN101174038A (en) * | 2006-11-01 | 2008-05-07 | 群康科技(深圳)有限公司 | LCD device |
| CN101681221A (en) * | 2008-03-28 | 2010-03-24 | 索尼株式会社 | Display device provided with touch sensor |
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