CN103105989A - Capacitance type embedded touch screen and display device - Google Patents
Capacitance type embedded touch screen and display device Download PDFInfo
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- CN103105989A CN103105989A CN201310026384XA CN201310026384A CN103105989A CN 103105989 A CN103105989 A CN 103105989A CN 201310026384X A CN201310026384X A CN 201310026384XA CN 201310026384 A CN201310026384 A CN 201310026384A CN 103105989 A CN103105989 A CN 103105989A
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Abstract
The invention discloses a capacitance type embedded touch screen and a display device. A grid signal line in a thin film transistor (TFT) array substrate is taken as a touch drive wire. A touch sensing line is arranged between pixel units of adjacent arrays in the TFT array substrate. A touch unit is arranged on the overlap position of a touch scanning line and the touch sensing line, wherein each touch unit is composed of a touch sensing electrode which is connected with the tough sensing line in an electrical mode, and a touch drive electrode which is connected with the touch scanning line in an electrical mode through a touch switch unit, and therefore the function of a touch screen is achieved. Due to the fact that the grid signal line is used for the touch scanning line to input grid scanning signals to the touch drive electrode of the touch unit. The grid scanning signals serve as drive signals for touch, the function of touch is achieved, an integrated circuit (IC) used for touch drive is not needed and production cost is saved.
Description
Technical field
The present invention relates to the display technique field, relate 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 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 the favor of each large panel producer.
At present, existing condenser type embedded (In cell) touch-screen is at existing TFT(Thin Film Transistor, what Thin Film Transistor (TFT)) on array base palte, direct increase touch-control sweep trace in addition and touch induction lines realized, namely make on the surface of tft array substrate the strip ITO electrode that two-layer mutual antarafacial intersects, this two-layer ITO(Indium Tin Oxides, indium tin metal oxide) electrode is respectively as touch-control drive wire and the touch induction lines of touch-screen, forms inductance capacitance in the antarafacial intersection of two ITO electrodes.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 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.
Summary of the invention
The embodiment of the present invention 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 embodiment of the present invention provides comprises the tft array substrate with signal line, and is provided with a plurality of pixel cells that are the matrix arrangement in described tft array substrate;
Described tft array substrate has the touch induction lines between the pixel cell of adjacent columns;
At least one signal line in tft array substrate is as the touch-control sweep trace;
Described tft array substrate has the touch control unit at the overlapping place that is positioned at described touch-control sweep trace and touch induction lines; Wherein,
Each touch control unit is by the touch-control sensing electrode that is electrical connected with adjacent touch induction lines, and the touch-control drive electrode that is electrical connected by touch switch unit and adjacent touch-control sweep trace forms; Described touch switch unit is used for when the touch-control sweep trace that is electrical connected with described touch switch unit loads the gated sweep signal, touch-control drive electrode and touch-control sweep trace that conducting is connected with described touch switch unit.
A kind of display device that the embodiment of the present invention provides comprises the embedded touch-screen of condenser type that the embodiment of the present invention provides.
The beneficial effect of the embodiment of the present invention comprises:
The embedded touch-screen of a kind of condenser type and display device that the embodiment of the present invention provides, with the signal line in tft array substrate as the touch-control drive wire, between the pixel cell of adjacent columns, touch induction lines is set in tft array substrate, and at the overlapping place of touch-control sweep trace and touch induction lines, touch control unit is set, wherein, each touch control unit is by the touch-control sensing electrode that is electrical connected with touch induction lines, and form by the touch-control drive electrode that touch switch unit and touch-control sweep trace are electrical connected, realize the function of touch-screen.Owing to using the signal line to input the gated sweep signal as the driven sweep signal of touch-control as the touch-control sweep trace to the touch-control drive electrode in touch control unit, realize touch controllable function, can avoid increasing the IC that drives for touch-control, saved cost of manufacture.
Description of drawings
The structural representation of tft array substrate in the embedding touch-screen that Fig. 1 provides for the embodiment of the present invention;
The partial enlarged drawing of A part in the tft array substrate that Fig. 2 provides for Fig. 1;
The structural representation of the embedded touch-screen of condenser type that Fig. 3 provides for the embodiment of the present invention;
The STRUCTURE DECOMPOSITION schematic diagram of the embedded touch-screen of condenser type that Fig. 4 provides for the embodiment of the present invention;
Fig. 5 a and 5b are respectively touch control unit that the embodiment of the present invention provides before touch-control and the schematic diagram in touch-control;
The structural representation of the touch control unit that Fig. 6 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the embedded touch-screen of condenser type that the embodiment of the present invention is provided and the embodiment of display device are described in detail.
In accompanying drawing, each layer film thickness and shape do not reflect the true ratio of tft array substrate or color membrane substrates, and purpose is signal explanation content of the present invention just.
The embedded touch-screen of a kind of condenser type that the embodiment of the present invention provides as shown in Figure 1, comprises the tft array substrate with signal line 01, and is provided with a plurality of pixel cells 02 that are the matrix arrangement in tft array substrate;
Tft array substrate has the touch induction lines 03 between the pixel cell of adjacent columns;
At least one signal line 01 in tft array substrate is as touch-control sweep trace 04;
Tft array substrate has the touch control unit at the overlapping place that is positioned at touch-control sweep trace 04 and touch induction lines 03; Wherein, as shown in Figure 2,
Each touch control unit is by the touch-control sensing electrode 05 that is electrical connected with adjacent touch induction lines 03, and the touch-control drive electrode 07 that is electrical connected by touch switch unit 06 and adjacent touch-control sweep trace 04 forms; Touch switch unit 06 is used for when the touch-control sweep trace 04 that is electrical connected with touch switch unit 06 loads the gated sweep signal, touch-control drive electrode 07 and touch-control sweep trace 04 that conducting is connected with touch switch unit 06.
The embedded touch-screen of above-mentioned condenser type provided by the invention, with the signal line in tft array substrate as the touch-control drive wire, between the pixel cell of adjacent columns, touch induction lines is set in tft array substrate, and at the overlapping place of touch-control sweep trace and touch induction lines, touch control unit is set, wherein, each touch control unit is by the touch-control sensing electrode that is electrical connected with touch induction lines, and form by the touch-control drive electrode that touch switch unit and touch-control sweep trace are electrical connected, to realize the function of touch-screen.Owing to using the signal line to input the gated sweep signal as the driving signal of touch-control as the touch-control sweep trace to the touch-control drive electrode in touch control unit, realize touch controllable function, can avoid increasing the IC that drives for touch-control, saved cost of manufacture.
Further, in the embedded touch-screen of above-mentioned condenser type that the embodiment of the present invention provides, as shown in Figure 3, can also comprise: be arranged at tft array substrate top and identical with tft array substrate size color membrane substrates;
This color membrane substrates one side of tft array substrate dorsad has screen layer for electric field shielding;
This screen layer at least with the touch control unit corresponding region be the open area, namely at the regional pattern-free of the corresponding touch control unit of screen layer, patternless zone is in Fig. 3 shown in the dotted line frame, and the region division of other in screen layer open area as required, do not do restriction at this certainly.
In the specific implementation, the material of this screen layer can be ITO, and screen layer can shield the interference of external electrical field, as shown in the STRUCTURE DECOMPOSITION schematic diagram of Fig. 4, at the screen layer regional pattern-free (namely put in a skylight) corresponding with touch control unit, people's bulk electric field can be applied on touch control unit by the skylight.
Particularly, as shown in Fig. 5 a, before touch-control, has coupling capacitance Co between the touch-control sensing electrode of composition touch control unit and touch-control drive electrode; As shown in Fig. 5 b, when touch-control, because the human body electric field action can act on respectively in touch control unit on touch-control sensing electrode and touch-control drive electrode, make capacitance between touch-control sensing electrode and the touch-control drive electrode Co → Co+ △ C that changes, at this moment, can determine whether to exist the contact by the change in voltage of touch-control sensing electrode.
Particularly, the lateral coordinates that can obtain touch point by the change in voltage of testing by column the touch induction lines that is connected with the touch-control sensing electrode is x direction coordinate, and can obtain the along slope coordinate y direction coordinate of touch point by the monitoring to the gated sweep signal that loads on the signal line as the touch-control sweep trace, thereby the position that obtains touching.
Preferably, in the specific implementation, the touch switch unit of the touch-control drive electrode that be used for to connect touch control unit and corresponding touch-control sweep trace can be the TFT device, wherein, the grid of TFT device and drain electrode are electrical connected with the touch-control sweep trace simultaneously, be grid and drain electrode short circuit, source electrode and touch-control drive electrode are electrical connected.Can be with each parts of existing pixel TFT device in tft array substrate with layer preparation as all parts of the TFT device of touch switch unit, need not increase new preparation technology like this, only need change the composition of each corresponding rete can realize, also just can not increase the cost of manufacture as the tft array substrate of touch-screen.
Adopt the TFT device of grid and drain electrode short circuit as the touch switch unit, in the time of can guaranteeing that the gated sweep signal that only loads at the touch-control sweep trace is noble potential, the gated sweep signal just can flow into as the driving signal of touch-control corresponding touch-control drive electrode, and when the gated sweep signal that the touch-control sweep trace loads is electronegative potential, the gated sweep signal can not flow into as the driving signal of touch-control in corresponding touch-control drive electrode, having guaranteed so only has the touch-control drive electrode of delegation to open at synchronization, thereby guarantees the uniqueness of the along slope coordinate of position of touch.
Usually, the touch-control precision of touch-screen is usually at grade, and the display precision of tft array substrate is usually at micron order, can find out, it is many that the touch-control sweep trace that touch screen is required and touch induction lines show that than tft array substrate required drive wire (data signal line and signal line) will lack, therefore, in the embedded touch-screen of the condenser type that the embodiment of the present invention provides, when setting touch sweep trace and touch induction lines, spacing between general each touch-control sweep trace is set to identical, and the spacing between each touch induction lines is set to identical.For example take shown in Fig. 1 as example, two, interval pixel cell between each touch-control sweep trace, two, interval pixel cell between each touch-control drive wire.
Best, it is identical that the spacing between can each touch-control sweep trace and the spacing between each touch induction lines are set to, to unify the touch-control precision of touch-screen.
Further, when realizing the touch induction lines between the pixel cell of adjacent columns in tft array substrate, data signal line in each touch induction lines and tft array substrate can be arranged and mutually insulated with layer, namely prepare the touch induction lines with its mutually insulated in each data signal line of preparation, like this, do not need to increase extra preparation section when the preparation tft array substrate, only need to can form the figure of data signal line and touch induction lines by a composition technique, can save preparation cost, the improving product added value.Certainly can prepare respectively touch induction lines and data signal line, not do restriction at this.
Particularly, the above-mentioned touch-screen that the embodiment of the present invention provides when at the overlapping place of touch-control sweep trace and touch induction lines, touch control unit being set, can adopt metal or transparent conductive oxide as the material of touch-control sensing electrode or touch-control drive electrode.
Preferably, in the specific implementation, the touch-control sensing electrode of each touch control unit and touch-control drive electrode can arrange with layer, also can arrange by different layer, as long as guarantee that both can form capacitance structure.The below is set to example with the touch-control sensing electrode of each touch control unit and touch-control drive electrode with layer describe.
When touch-control sensing electrode and touch-control drive electrode adopt transparent conductive oxide to prepare, touch control unit can with tft array substrate in pixel electrode with layer preparation and need to guarantee both mutually insulateds; When touch-control sensing electrode and touch-control drive electrode adopt preparation of metals, touch control unit can with tft array substrate in the source-drain electrode of TFT device with layer preparation and guarantee both mutually insulateds, therefore not to repeat here.
Because each touch control unit only arranges at the overlapping place of touch-control sweep trace and touch induction lines, for guaranteeing the aperture opening ratio of touch-screen, it is smaller that the touch-control area of each touch control unit can arrange, and this is unfavorable for improving touch-control sensitivity.Therefore, preferably, in the touch-screen that the embodiment of the present invention provides, as shown in Figure 6, can also comprise: at least one the first touch-control sub-electrode 08 that is electrical connected with touch-control sensing electrode 05, and at least one the second touch-control sub-electrode 09 that is electrical connected with touch-control sensing electrode 07; The first touch-control sub-electrode and 08 second touch-control sub-electrode 09 lay respectively at the gap location between adjacent pixel unit.Like this, can increase the touch-control area of each touch control unit on the basis of the aperture opening ratio that guarantees touch-screen, to improve the sensitivity of touch-control sensing as far as possible.
Further, when each first touch-control sub-electrode 08 and the second touch-control sub-electrode 09 are set, for each touch control unit: as shown in Figure 6, each the first touch-control sub-electrode 08 that is electrical connected with touch-control sensing electrode 05 and each second touch-control, 09 electrode that is electrical connected with touch-control drive electrode 07 are preferably corresponding one by one, and the first sub-electrode 08 of every a pair of mutual correspondence and the second sub-electrode 09 formation capacitance structure.Certainly, the first touch-control sub-electrode 08 in each touch control unit and the quantity of the second touch-control sub-electrode 09 can be not identical, do not do restriction at this.
Based on same inventive concept, the embodiment of the present invention also provides a kind of display device, comprise the embedded touch-screen of above-mentioned condenser type that the embodiment of the present invention 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 embodiment of the present invention provides, with the signal line in tft array substrate as the touch-control drive wire, between the pixel cell of adjacent columns, touch induction lines is set in tft array substrate, and at the overlapping place of touch-control sweep trace and touch induction lines, touch control unit is set, wherein, each touch control unit is by the touch-control sensing electrode that is electrical connected with touch induction lines, and form by the touch-control drive electrode that touch switch unit and touch-control sweep trace are electrical connected, realize the function of touch-screen.Owing to using the signal line to input the gated sweep signal as the driven sweep signal of touch-control as the touch-control sweep trace to the touch-control drive electrode in touch control unit, realize touch controllable function, can avoid increasing the IC that drives for touch-control, saved cost of manufacture.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of claim of the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. the embedded touch-screen of condenser type, comprise the tft array substrate with signal line, and be provided with a plurality of pixel cells that are the matrix arrangement in described tft array substrate; It is characterized in that,
Described tft array substrate has the touch induction lines between the pixel cell of adjacent columns;
At least one signal line in tft array substrate is as the touch-control sweep trace;
Described tft array substrate has the touch control unit at the overlapping place that is positioned at described touch-control sweep trace and touch induction lines; Wherein,
Each touch control unit is by the touch-control sensing electrode that is electrical connected with adjacent touch induction lines, and the touch-control drive electrode that is electrical connected by touch switch unit and adjacent touch-control sweep trace forms; Described touch switch unit is used for when the touch-control sweep trace that is electrical connected with described touch switch unit loads the gated sweep signal, touch-control drive electrode and touch-control sweep trace that conducting is connected with described touch switch unit.
2. touch-screen as claimed in claim 1, is characterized in that, described touch switch unit is the TFT device, and wherein, the grid of described TFT device and drain electrode are electrical connected with the touch-control sweep trace simultaneously, and source electrode and touch-control drive electrode are electrical connected.
3. touch-screen as claimed in claim 1, is characterized in that, the spacing between each described touch-control sweep trace is identical, and the spacing between each described touch induction lines is identical.
4. touch-screen as claimed in claim 1, is characterized in that, the data signal line in each described touch induction lines and described tft array substrate arranges and mutually insulated with layer.
5. touch-screen as claimed in claim 1, is characterized in that, the material of described touch-control sensing electrode or described touch-control drive electrode is metal or transparent conductive oxide.
6. touch-screen as claimed in claim 5, is characterized in that, the touch-control sensing electrode of each touch control unit and touch-control drive electrode arrange with layer.
7. as the described touch-screen of claim 1-6 any one, it is characterized in that, also comprise: at least one the first touch-control sub-electrode that is electrical connected with described touch-control sensing electrode, and at least one the second touch-control sub-electrode that is electrical connected with described touch-control sensing electrode;
Described the first touch-control sub-electrode and described the second touch-control sub-electrode lay respectively at the gap location between adjacent pixel unit.
8. touch-screen as claimed in claim 7, it is characterized in that, for each touch control unit: each the first touch-control sub-electrode that is electrical connected with the touch-control sensing electrode and each the second touch-control sub-electrode that is electrical connected with the touch-control drive electrode are corresponding one by one, and the first sub-electrode of every a pair of mutual correspondence and the second sub-electrode formation capacitance structure.
9. as the described touch-screen of claim 1-6 any one, it is characterized in that, also comprise: be arranged at described tft array substrate top and identical with described tft array substrate size color membrane substrates;
The described color membrane substrates one side of described tft array substrate dorsad has screen layer for electric field shielding;
Described screen layer at least with described touch control unit corresponding region be the open area.
10. a display device, is characterized in that, comprises as the embedded touch-screen of the described condenser type of claim 1-9 any one.
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| CN201310026384.XA CN103105989B (en) | 2013-01-24 | 2013-01-24 | A kind of capacitance type in-cell touch panel and display device |
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| CN201310026384.XA CN103105989B (en) | 2013-01-24 | 2013-01-24 | A kind of capacitance type in-cell touch panel and display device |
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| CN106648250A (en) * | 2016-12-30 | 2017-05-10 | 南京中电熊猫液晶显示科技有限公司 | In-Cell touch control panel and manufacturing method thereof |
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| CN106648250A (en) * | 2016-12-30 | 2017-05-10 | 南京中电熊猫液晶显示科技有限公司 | In-Cell touch control panel and manufacturing method thereof |
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