CN202711227U - Capacitive in-cell touch panel and display device - Google Patents
Capacitive in-cell touch panel and display device Download PDFInfo
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- CN202711227U CN202711227U CN201220416587.0U CN201220416587U CN202711227U CN 202711227 U CN202711227 U CN 202711227U CN 201220416587 U CN201220416587 U CN 201220416587U CN 202711227 U CN202711227 U CN 202711227U
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Abstract
The utility model discloses a capacitive in-cell touch panel and a display device. At least one touch-sensitive electrode is arranged on a color film substrate; at least one touch drive electrode is arranged on a thin film transistor (TFT) array substrate; the touch drive electrode is electrically connected a grid line in the TFT array substrate, wherein each touch drive electrode consists of touch drive sub-electrodes positioned between pixel units of adjacent lines in the same row. Because a display signal is input by the grid line connected with the touch drive electrode to serve as a touch drive signal, a touch function is realized; an integrated circuit (IC) used for touch drive is prevented from being added; and the manufacturing cost is saved.
Description
Technical field
The utility model relates to the display technique field, relates in particular to the embedded touch-screen of a kind of condenser type and display device.
Background technology
Along with the develop rapidly of display technique, touch-screen (Touch Screen Panel) spreads all in people's the life gradually.At present, touch-screen can be divided into according to forming structure: external hanging type touch-screen (Add on Mode Touch Panel), covering surfaces formula touch-screen (On Cell Touch Panel) and embedded touch-screen (In Cell Touch Panel).Wherein, the external hanging type touch-screen is with touch-screen and LCDs (Liquid Crystal Display, LCD) separately produce, then fitting to becomes the LCDs with touch function together, and there are the shortcomings such as cost of manufacture is higher, light transmission rate is lower, module is thicker in the external hanging type touch-screen.And embedded touch-screen is embedded in LCDs inside with the touch-control electrode of touch-screen, and thickness that can attenuate module integral body can reduce again the cost of manufacture of touch-screen greatly, is subject to each large panel producer favor.
At present, existing condenser type embedded (in cell) touch-screen is at existing TFT(Thin Film Transistor, what Thin Film Transistor (TFT)) direct in addition increase touch-control sweep trace and touch induction lines realized on the array base palte, namely make the strip ITO electrode that two-layer mutual antarafacial intersects on the surface of tft array substrate, this two-layer ITO(Indium Tin Oxides, indium tin metal oxide) electrode as touch-control drive wire and the touch induction lines of touch-screen, forms inductance capacitance in the antarafacial intersection of two ITO electrodes respectively.Its course of work is: when the ITO electrode as the touch-control drive wire is loaded touch-control driving signal, detect the voltage signal that touch induction lines is coupled out by inductance capacitance, in this process, when human body contact touch-screen is arranged, people's bulk electric field will act on the inductance capacitance, and the capacitance of inductance capacitance is changed, and then changes the voltage signal that touch induction lines is coupled out, according to the variation of voltage signal, just can determine contact position.
The structural design of the embedded touch-screen of above-mentioned condenser type need to utilize two driving chips (IC) to realize that respectively touch-control drives and display driver simultaneously, and cost is higher.
The utility model content
The utility model embodiment provides the embedded touch-screen of a kind of condenser type and display device, in order to realize the embedded touch-screen of lower-cost condenser type.
The embedded touch-screen of a kind of condenser type that the utility model embodiment provides, comprise: color membrane substrates, the thin film transistor (TFT) tft array substrate, and the liquid crystal layer between described color membrane substrates and described tft array substrate, be provided with into a plurality of pixel cells that matrix is arranged at described tft array substrate, also comprise:
Be positioned at described tft array substrate towards at least one touch-control drive electrode of described liquid crystal layer one side, and be positioned at described color membrane substrates towards at least one touch-control sensing electrode of described liquid crystal layer one side; Wherein,
Described touch-control sensing electrode is along the column direction wiring of pixel cell; Described touch-control drive electrode is along the wiring of the line direction of pixel cell, and is electrical connected with at least one grid line in the described tft array substrate;
Every described touch-control drive electrode comprises the touch-control driven element electrode that a plurality of colleagues arrange, and described touch-control driven element electrode is between the adjacent columns pixel cell.
A kind of display device that the utility model embodiment provides comprises the embedded touch-screen of condenser type that the utility model embodiment provides.
The beneficial effect of the utility model embodiment comprises:
The embedded touch-screen of a kind of condenser type and display device that the utility model embodiment provides, at color membrane substrates at least one touch-control sensing electrode is set, at tft array substrate at least one touch-control drive electrode is set, grid line in touch-control drive electrode and the tft array substrate is electrically connected, wherein, every touch-control drive electrode is comprised of the touch-control driven element electrode between the adjacent columns pixel cell that the colleague arranges.Owing to using the grid line that is connected with the touch-control drive electrode to the driving signal of its input display as touch-control, realize touch controllable function, avoided increasing being used for the IC that touch-control drives, saved cost of manufacture.
Description of drawings
The structural representation of the embedded touch-screen of condenser type that Fig. 1 provides for the utility model embodiment;
The structural representation of the tft array substrate of the touch-screen that Fig. 2 provides for the utility model embodiment;
The structural representation of the color membrane substrates of the touch-screen that Fig. 3 a-Fig. 3 c provides for the utility model embodiment;
The touch-screen color membrane substrates that Fig. 4 a-Fig. 4 b provides for the utility model embodiment and the tft array substrate structural representation after to box;
The projection electric field line schematic diagram of the touch-screen that Fig. 5 a-Fig. 5 c provides for the utility model embodiment;
The annexation schematic diagram of the touch induction lines that Fig. 6 provides for the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, the embedded touch-screen of condenser type that the utility model embodiment is provided and the embodiment of display device are described in detail.
Each layer film thickness and shape do not reflect the true ratio of tft array substrate or color membrane substrates in the accompanying drawing, and purpose is signal explanation the utility model content just.
The embedded touch-screen of a kind of condenser type that the utility model embodiment provides, as shown in Figure 1, specifically comprise: color membrane substrates 1, tft array substrate 2, and the liquid crystal layer 3 between color membrane substrates 1 and tft array substrate 2, be provided with into a plurality of pixel cells 4 that matrix is arranged at tft array substrate 2, also comprise:
Be positioned at tft array substrate 2 towards at least one touch-control drive electrode 5 of liquid crystal layer 3 one sides, and be positioned at color membrane substrates 1 towards at least one touch-control sensing electrode 6 of liquid crystal layer 3 one sides; Wherein,
Touch-control sensing electrode 6 is along the column direction wiring of pixel cell 4; Figure 2 shows that the tft array substrate vertical view, as can be seen from Figure 2, a pixel cell 4 is comprised of three sub-pix unit of RGB, and touch-control drive electrode 5 is along the wiring of the line direction of pixel cell 4, and is electrical connected with at least one grid line 7 in the tft array substrate 2;
Every touch-control drive electrode 5 comprises the touch-control driven element electrode 51 that a plurality of colleagues arrange, and this touch-control driven element electrode 51 is between adjacent columns pixel cell 4.
The embedded touch-screen of above-mentioned condenser type that the utility model embodiment provides, use the grid line that is connected with the touch-control drive electrode to the driving signal of its input display as touch-control, realize touch controllable function, avoided increasing being used for the IC that touch-control drives, saved cost of manufacture.
In the specific implementation, source electrode in touch-control driven element electrode and the tft array substrate and drain electrode can be arranged with layer, namely in a composition technique, prepare simultaneously the source electrode of TFT and the figure of drain electrode and touch-control driven element electrode, in the preparation process of tft array substrate, can not increase so new composition technique, just can not increase the cost of manufacture as the tft array substrate of touch-screen yet.
Further, realizing that touch-control drive electrode and grid line are electrically connected, so that the display that uses grid line can be with each the touch-control driven element electrode in the same touch-control drive electrode by being electrical connected with the driving data lines that layer arranges with it during as the driving signal of touch-control; This driving data lines and is electrical connected with grid line between the adjacent lines pixel cell.Namely in each touch-control driven element electrode of preparation, prepare connected driving data lines, this driving data lines can be parallel with the grid line in the tft array substrate, namely be arranged on the gap location between the adjacent lines pixel cell, then by via hole this driving data lines and grid line are electrically connected, so that grid line provides signal to it.
Perhaps, realizing that touch-control drive electrode and grid line are electrically connected, so that the display that uses grid line is during as the driving signal of touch-control, as shown in Figure 2, can with each the touch-control driven element electrode 51 in the same touch-control drive electrode 5 respectively directly and grid line 7 be electrical connected, can save like this composition technique of preparation driving data lines, for example: adopt touch-control driven element electrode 5 to be electrically connected by the direct and overlapping grid line 7 of via hole, when touch-control driven element electrode 5 and grid line 7 are not overlapping, can adopt wire to connect.
Particularly, because the touch-control driven element electrode in every touch-control drive electrode is arranged on the gap location between the pixel cell, therefore, the width of each touch-control driven element electrode can be greater than the gap between the adjacent columns pixel cell.
Usually, the precision of touch-screen is usually at grade, and the precision of liquid crystal display is usually at micron order, and the length of touch-control driven element electrode has determined the precision of touch-screen, namely can be according to the length of required touch-control accuracy selection touch-control driven element electrode, therefore, the length of each touch-control driven element electrode can be crossed over the row of a plurality of liquid crystal displays to pixel cell, general its length can be more than 2mm, like this, each touch-control driven element electrode will with tft array substrate in provide many grid lines of display overlapping for TFT, and can produce stray capacitance at both overlapping places, the larger stray capacitance of overlapping area is larger, and stray capacitance can cause the bad quality defectives such as picture greening and line image retention, and this defective can be more and more obvious along with the large scaleization of panel.
Therefore, in the specific implementation, reduce stray capacitance for the overlapping area that reduces touch-control sub-electrode and grid, as shown in Figure 2, each touch-control driven element electrode 51 can be that a plurality of row that are electrical connected are to adjacent drive point electrode, this drive point electrode is in every row between the adjacent columns pixel cell, interconnect by wire, Fig. 2 consists of example with a touch-control driven element electrode 51 by 4 drive point electrodes, the dotted line collimation mark has been shown a drive point electrode among Fig. 2, the overlapping area of wire and grid line can be far smaller than the overlapping area of drive point electrode and grid line like this, thus the generation of as far as possible little minimizing stray capacitance.
In the specific implementation, between the touch-control sensing electrode on the color membrane substrates specifically can substrate and color resin at color membrane substrates, also can be positioned at the color resin of color membrane substrates towards the one side of liquid crystal layer.
Usually, have and the pixel cell of tft array substrate colored light-filtering units one to one at color membrane substrates, this colored light-filtering units also is made of three inferior colored light-filtering units of RGB, because the touch-control sensing electrode is along the column direction wiring of pixel cell, particularly, the small part that is projected to that the touch-control sensing electrode can be arranged on the tft array substrate covers the touch-control drive electrode, and, the touch-control driven element electrode that a plurality of colleagues that comprise owing to every touch-control drive electrode arrange is between the adjacent columns pixel cell, in the specific implementation, touch-control sensing electrode 6 can all be arranged between the adjacent columns colored light-filtering units 8 of color membrane substrates, shown in Fig. 3 a, be the projection of touch-control sensing electrode 6 on tft array substrate shown in Fig. 4 a, all cover the touch-control drive electrode; Touch-control sensing electrode 6 also can optionally arrange between the part adjacent columns colored light-filtering units 8, for example: in the gap between a row colored light-filtering units 8 a touch-control sensing electrode 6 is set, shown in Fig. 3 b, be that the projection of touch-control drive electrode 6 on tft array substrate is shown in Fig. 4 b, partial coverage touch-control drive electrode is not done detailed description at this.
Further, can be produced in the prior art color membrane substrates dorsad the guarded electrode of liquid crystal layer one side be produced on color membrane substrates towards the one side of liquid crystal layer, be conducive to like this color membrane substrates and tft array substrate and box body carried out reduction processing after to box, namely use the particular liquid etching to expose substrate in the outside.Particularly, many guarded electrodes can between the substrate and color resin of color membrane substrates, also can be positioned at the color resin of color membrane substrates towards the one side of liquid crystal layer.In the specific implementation, pass into common electrode signal by the public electrode alignment guarded electrode with the guarded electrode electric connection, interference with the shielding outer signals, preferably, guarded electrode is produced on the interference that more is conducive to guarded electrode shielding outer signals between the substrate of color membrane substrates and the color resin.
And, the guarded electrode of whole layer preparation in the prior art is optimized to the strip guarded electrode, guarded electrode is set to identical with the wiring direction of touch-control sensing electrode, and both projections on color membrane substrates are not overlapping mutually, for example: the projection of guarded electrode on tft array substrate all is covered in a row pixel cell, namely shown in Fig. 3 a and Fig. 3 b, a guarded electrode 9 covers the colored light-filtering units 8 that row are comprised of RGB on color membrane substrates.Like this, when every touch-control sensing electrode all is covered between the adjacent columns pixel cell in the projection on the tft array substrate, or partial coverage is between the adjacent columns pixel cell time, shown in Fig. 3 a and Fig. 3 b, because that the figure of guarded electrode 9 and touch-control sensing electrode 6 does not have is overlapping, therefore, can guarded electrode and the same layer of touch-control sensing electrode be set with layer, certainly, guarded electrode and touch-control sensing electrode also can be arranged on the different layers of color membrane substrates, do not do restriction at this.
Particularly, when every touch-control sensing electrode 6 projection on tft array substrate all is covered between the adjacent columns pixel cell 4, color membrane substrates and the tft array substrate vertical view after to box is shown in Fig. 4 a, can find out, thread touch sensor 6 substantially covers and touches on the driven element electrode 51, therefore, be unfavorable for that the electric field that touch-control drive electrode 5 sends throws by the gap between the guarded electrode 9, shown in Fig. 5 a; And when the projection section of every touch-control sensing electrode 6 on tft array substrate is covered between the adjacent columns pixel cell 4, color membrane substrates and the tft array substrate vertical view after to box is shown in Fig. 4 b, can find out, thread touch sensor 6 partial coverages are touching on the driven element electrode 51, namely there is part to touch the touch-control sensing electrode 6 that does not stop on the driven element electrode 51, therefore, the electric field that touch-control drive electrode 5 sends has part to project by the gap between the guarded electrode 9 on the touch-control sensing electrode 9, shown in Fig. 5 b.
Further, every the touch-control sensing electrode covers the touch-control drive electrode in the small part that is projected on the tft array substrate except being set to, every touch-control sensing electrode projection on tft array substrate can also be not overlapping with the touch-control drive electrode, namely for example shown in Fig. 3 c, touch-control sensing electrode 6 covers the sub-colored light-filtering units of row in the colored light-filtering units, and in this case, touch-control sensing electrode 6 is general between the substrate and color resin layer of color membrane substrates, at this moment, on color membrane substrates, can also comprise: be arranged on the color resin that is positioned at color membrane substrates towards many guarded electrodes 9 of the one side of liquid crystal layer, every the projection of guarded electrode on color membrane substrates covers at least one touch-control sensing electrode, for example: the projection of guarded electrode on tft array substrate all covers a row pixel cell, shown in Fig. 5 c, in this case, guarded electrode generally is positioned at the color resin of color membrane substrates towards the one side of liquid crystal layer.
Particularly, above-mentioned every touch-control sensing electrode projection on tft array substrate covers the design of the row sub-pix unit in the row pixel cell, shown in Fig. 5 c, can further reduce blocking of projection electric field, being about to touch-control sensing electrode 6 is arranged on the sub-colored light-filtering units of row, the electric field that touch-control drive electrode 5 sends can project by the gap between the guarded electrode 9 on the touch-control sensing electrode 6, can not be blocked.
Further, the color membrane substrates of said structure will have two-layer electrode, i.e. guarded electrode 9 and touch-control sensing electrode 6, and in order to reduce the signal delay of two-layer electrode, generally the THICKNESS CONTROL with this two-layer electrode exists
Above, and, in order to reduce the stray capacitance between guarded electrode 9 and the touch-control sensing electrode 6, it is narrower that the width of touch-control sensing electrode should design as far as possible, probably about 20 μ m, in the specific implementation, can according to the concrete width numerical value of the determine precision touch-control sensing electrode of the size of LCDs, required aperture opening ratio and required touch-control, not do detailed description at this.
Accordingly, because the precision of touch-screen is usually at grade, and the precision of liquid crystal display is usually at micron order, a plurality of adjacent touch-control sensing electrodes can be used as a touch-control sensing electrode, in the specific implementation, touch-control precision that can be as required, many adjacent touch induction lines are passed through the wire conducting at arbitrary end, use as a touch-control sensing electrode, as shown in Figure 6, take 3 touch-control sensing electrodes 6 at one end by the wire conducting as example, with per 3 touch-control sensing electrode 6 conductings as a touch-control sensing electrode after, it by linking to each other with touch-control flexible PCB (Touch FPC) by sealed plastic box in color membrane substrates fan-out zone (fanout), can be reduced the cabling at fanout like this.
Based on same utility model design, the utility model embodiment also provides a kind of display device, comprise the embedded touch-screen of above-mentioned condenser type that the utility model embodiment provides, the enforcement of this display device can referring to the embodiment of the embedded touch-screen of above-mentioned condenser type, repeat part and repeat no more.
The embedded touch-screen of a kind of condenser type and display device that the utility model embodiment provides, at color membrane substrates at least one touch-control sensing electrode is set, at tft array substrate at least one touch-control drive electrode is set, grid line in touch-control drive electrode and the tft array substrate is electrically connected, wherein, every touch-control drive electrode is comprised of the touch-control driven element electrode between the adjacent columns pixel cell that the colleague arranges.Owing to using the grid line that is connected with the touch-control drive electrode to the driving signal of its input display as touch-control, realize touch controllable function, avoided increasing being used for the IC that touch-control drives, saved cost of manufacture.
Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from spirit and scope of the present utility model.Like this, if of the present utility model these are revised and modification belongs within the scope of the utility model claim and equivalent technologies thereof, then the utility model also is intended to comprise these changes and modification interior.
Claims (14)
1. the embedded touch-screen of condenser type comprises: color membrane substrates, thin film transistor (TFT) tft array substrate, and the liquid crystal layer between described color membrane substrates and described tft array substrate, be provided with into a plurality of pixel cells that matrix is arranged at described tft array substrate, it is characterized in that, also comprise:
Be positioned at described tft array substrate towards at least one touch-control drive electrode of described liquid crystal layer one side, and be positioned at described color membrane substrates towards at least one touch-control sensing electrode of described liquid crystal layer one side; Wherein,
Described touch-control sensing electrode is along the column direction wiring of pixel cell; Described touch-control drive electrode is along the wiring of the line direction of pixel cell, and is electrical connected with at least one grid line in the described tft array substrate;
Every described touch-control drive electrode comprises the touch-control driven element electrode that a plurality of colleagues arrange, and described touch-control driven element electrode is between the adjacent columns pixel cell.
2. touch-screen as claimed in claim 1 is characterized in that, the source electrode in described touch-control driven element electrode and the described tft array substrate and drain electrode arrange with layer.
3. touch-screen as claimed in claim 2 is characterized in that, each the touch-control driven element electrode in the described touch-control drive electrode of same is by being electrical connected with the driving data lines that layer arranges with it; Described driving data lines and is electrical connected with described grid line between the adjacent lines pixel cell.
4. touch-screen as claimed in claim 2 is characterized in that, each the touch-control driven element electrode in the described touch-control drive electrode of same is electrical connected with described grid line respectively.
5. such as each described touch-screen of claim 1-4, it is characterized in that, each described touch-control driven element electrode comprises a plurality of row that are electrical connected to adjacent drive point electrode, and described drive point electrode is in every row between the adjacent columns pixel cell.
6. touch-screen as claimed in claim 1 is characterized in that, described touch-control sensing electrode or is positioned at the color resin of described color membrane substrates towards the one side of described liquid crystal layer between the substrate and color resin of described color membrane substrates.
7. touch-screen as claimed in claim 1 is characterized in that, the be projected to small part of every described touch-control sensing electrode on tft array substrate covers described touch-control drive electrode.
8. touch-screen as claimed in claim 7 is characterized in that, described color membrane substrates also comprises: many guarded electrodes between the substrate and color resin of described color membrane substrates, or are positioned at the color resin of described color membrane substrates towards the one side of described liquid crystal layer;
Described guarded electrode is identical with the wiring direction of described touch-control sensing electrode, and both projections on color membrane substrates are not overlapping mutually.
9. touch-screen as claimed in claim 8 is characterized in that, described guarded electrode and described touch-control sensing electrode arrange with layer.
10. touch-screen as claimed in claim 1 is characterized in that, projection and the described touch-control drive electrode of every described touch-control sensing electrode on tft array substrate is not overlapping.
11. touch-screen as claimed in claim 10 is characterized in that, described color membrane substrates also comprises: be positioned at the color resin of described color membrane substrates towards many guarded electrodes of the one side of described liquid crystal layer; Every the projection of described guarded electrode on color membrane substrates covers at least one described touch-control sensing electrode.
12. touch-screen as claimed in claim 11 is characterized in that, described touch-control sensing electrode is between the substrate and color resin layer of described color membrane substrates, and described guarded electrode is positioned at the color resin of described color membrane substrates towards the one side of described liquid crystal layer.
13. such as each described touch-screen of claim 6-12, it is characterized in that, many adjacent described touch induction lines are passed through the wire conducting at arbitrary end.
14. a display device is characterized in that, comprises such as the embedded touch-screen of each described condenser type of claim 1-13.
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| CN201220416587.0U CN202711227U (en) | 2012-08-21 | 2012-08-21 | Capacitive in-cell touch panel and display device |
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| CN201220416587.0U CN202711227U (en) | 2012-08-21 | 2012-08-21 | Capacitive in-cell touch panel and display device |
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| WO2014153862A1 (en) * | 2013-03-25 | 2014-10-02 | 合肥京东方光电科技有限公司 | Capacitive built-in touch screen and display device |
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