CN202838292U - Capacitance-type embedded touch screen and display device - Google Patents
Capacitance-type embedded touch screen and display device Download PDFInfo
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- CN202838292U CN202838292U CN 201220539108 CN201220539108U CN202838292U CN 202838292 U CN202838292 U CN 202838292U CN 201220539108 CN201220539108 CN 201220539108 CN 201220539108 U CN201220539108 U CN 201220539108U CN 202838292 U CN202838292 U CN 202838292U
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Abstract
The utility model discloses a capacitance-type embedded touch screen and a display device. Adjacent two rows of pixel units are served as one pixel unit on the thin film transistor (TFT) array baseplate. A pixel structure provided with two grid signal wires is arranged between the two rows of pixel units. Positions of grid signal wires between the adjacent pixel units can be saved through changing positions of the grid signal wires of the adjacent two rows of pixel units and a TFT switch. In this way, a touch driving wire is arranged at the saved positions of the grid signal wires, and a touch induction electrode is arranged on the color firm baseplate and extends along the line direction of the pixel units, and the touching effect can be achieved under the conditions of guaranteeing high aperture opening rate.
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.
In order to improve to greatest extent the aperture opening ratio of touch display screen, the design touch-screen tft array substrate in dot structure the time can adopt structure shown in Figure 1, it is that an existing entire row of pixels unit is spun upside down that the pixel cell of the 2nd, 4 row among this Fig. 1 can be considered; Two every adjacent row pixel cells in this structure in the tft array substrate are as a pixel cell group, between this two row pixel cell, have two signal lines and be respectively this two row pixel cell the gated sweep signal is provided, for example the Gate1 among Fig. 1 and Gate2, Gate3 and Gate4.Can correspondingly can reduce the area be used to the black matrix that blocks TFT switch and grid line like this with the TFT switch designs in these adjacent two row pixel cells together, help to improve the aperture opening ratio of touch display screen.In addition, in dot structure shown in Figure 1, the signal line by changing adjacent two row pixel cells and the position of TFT switch can save the position of signal line between the adjacent pixel cell group.Like this, just can public electrode wire Vcom1, Vcom2, the Vcom3 that be electrically connected with public electrode be set in the position of the signal line that saves, can utilize a public electrode wire to provide common electric voltage for two adjacent row pixel cells based on this structure, and make the entrained common electrode signal of public electrode more stable.And at present also not based on the design of the embedded touch-screen of condenser type of as shown in Figure 1 dot structure.
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 having the embedded touch-screen of condenser type of high aperture.
The utility model embodiment provides a kind of condenser type embedded touch-screen, comprising: 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 formed with in the embedded touch-screen of described condenser type and be a plurality of pixel cells that matrix is arranged; Take every two adjacent row pixel cells as a pixel cell group, having the delegation that two signal lines are respectively this two row pixel cell between this two row pixel cell provides the gated sweep signal; Also comprise:
Described color membrane substrates has many touch-control sensing electrodes that extend along the column direction of pixel cell;
Described tft array substrate has many touch-control drive wires that extend along the line direction of pixel cell, the gap location of each described touch-control drive wire between adjacent pixel cell group; In the displaying time of a frame picture, described touch-control drive electrode line is used for timesharing ground and transmits common electrode signal and touch scanning signals.
The utility model embodiment provides a kind of display device, 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 adopt take two adjacent row pixel cells as a pixel cell group at tft array substrate, have the dot structure of two signal lines between this two row pixel cell; Signal line by changing adjacent two row pixel cells and the position of TFT switch, can save the position of signal line between the adjacent pixel cell group, like this, the touch-control drive wire of realizing touch controllable function is arranged on the position of the signal line that saves, and the touch-control sensing electrode is arranged on the color membrane substrates and extends along the column direction of pixel cell, in the situation that guarantees to have than high aperture, realize touch controllable function.
Description of drawings
Fig. 1 is the structural representation of tft array substrate in the display panel in the prior art;
The longitudinal profile synoptic diagram of the embedded touch-screen of condenser type that Fig. 2 provides for the utility model embodiment;
One of schematic top plan view of tft array substrate in the embedded touch-screen of condenser type that Fig. 3 provides for the utility model embodiment;
The working timing figure of the embedded touch-screen of condenser type that Fig. 4 provides for the utility model embodiment;
In the embedded touch-screen of condenser type that Fig. 5 provides for the utility model embodiment two of the schematic top plan view of tft array substrate;
The structural representation of touch-control drive electrode and touch-control sensing electrode in the embedded touch-screen of condenser type that Fig. 6 a and Fig. 6 b provide for the utility model embodiment;
The touch-control drive electrode that Fig. 7 provides for the utility model embodiment and the subregional synoptic diagram at the overlapping place of touch-control sensing electrode;
The synoptic diagram of the embedded touch-screen of condenser type with antistatic protection film that Fig. 8 provides for the utility model embodiment.
Embodiment
At present, the lcd technology that can realize wide visual angle mainly contains plane internal switch (IPS, In-Plane Switch) technology and senior super dimension field switch (ADS, Advanced Super Dimension Switch) technology; Wherein, the electric field that the electric field that the ADS technology produces by gap electrode edge in the same plane and gap electrode layer and plate electrode interlayer produce forms multi-dimensional electric field, make in the liquid crystal cell between gap electrode, all aligned liquid-crystal molecules can both produce rotation directly over the electrode, thereby improved the liquid crystal work efficiency and increased light transmission efficiency.A senior super dimension switch technology can improve the picture quality of TFT-LCD product, has high resolving power, high permeability, low-power consumption, wide visual angle, high aperture, low aberration, without advantages such as water of compaction ripples (push Mura).H-ADS(high aperture-senior super dimension field switch) be a kind of important implementation of ADS technology.
The utility model embodiment has proposed the embedded touch screen structure of a kind of new condenser type based on existing ADS technology and H-ADS technology.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 vertical view of tft array substrate in Fig. 2 and the longitudinal profile synoptic diagram that is respectively the embedded touch-screen of condenser type that the utility model embodiment provides shown in Figure 3 and the touch-screen.As shown in Figures 2 and 3, the embedded touch-screen of the condenser type that the utility model embodiment provides specifically comprises: 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 formed with a plurality of pixel cells 4 that are the matrix arrangement in the embedded touch-screen of this condenser type; Take every two adjacent row pixel cells 4 as a pixel cell group 5, having the delegation that two signal lines 6 are respectively this two row pixel cell 4 between this two row pixel cell 4 provides the gated sweep signal; Also comprise:
The embedded touch-screen of above-mentioned condenser type that the utility model embodiment provides, the signal line by changing adjacent two row pixel cells and the position of TFT switch can save the position of signal line between the adjacent pixel cell group.And, because the precision of touch-screen is usually at grade, and the precision of LCDs is usually at micron order, can find out and show that required precision is far longer than the required precision of touch-control, therefore, the touch-control drive wire of realizing touch controllable function is arranged on the position of the signal line that saves, both can guarantees the precision that touch-control is required, can too much not take again the open area of pixel cell, realize having the touch-screen than high aperture.
In addition, the utility model above-mentioned touch-screen implementation of implementing to provide equally also is applicable to twisted-nematic (TN, Twisted Nematic) type.Particularly, on the TN type tft array substrate based on Fig. 1 structure, can be with the part public electrode wire as touch-control drive electrode line, and setting and ITO pixel electrode are with the ITO touch-control drive electrode of layer and mutually insulated; On color membrane substrates with strip ITO public electrode as the touch-control sensing electrode; Because the TN type belongs to prior art, does not do at this and gives unnecessary details.
Further, for phase mutual interference between the display that reduces touch-screen and the touching signals, can adopt in the specific implementation touch-control and show the mode that timesharing drives, to avoid showing and touch-control influences each other in the course of the work each other as far as possible.
Particularly, the driving method of the embedded touch-screen of above-mentioned condenser type that the utility model embodiment provides, sequential chart as shown in Figure 4 specifically comprises:
At first, touch-screen is shown that the time of each frame (Vsync) is divided into displaying time section (Display) and touch-control time period (Touch), for example the time of demonstration one frame of touch-screen is 16.67ms in the driving sequential chart shown in Figure 4, choose wherein 4ms as the touch-control time period, other 12.67ms is as the displaying time section, can certainly according to the processing power of IC chip and suitable both durations of adjustment of design of Panel itself, be not specifically limited at this.
At displaying time section (Display), touch-control drive electrode Tx and touch-control sensing electrode Rx are applied low level signal, simultaneously, to every in touch-screen signal line G1, G2 ... Gn applies scanning gate signal successively, and data signal line Data is applied the GTG signal, the upset of control liquid crystal molecule; Be as good as with normal liquid crystal panel principle of work during this period of time.
At touch-control time period (Touch), the touch-control drive wire that is electrical connected with touch-control drive electrode Tx is applied touch scanning signals, voltage signal and the output of touch-control sensing electrode Rx coupling touch scanning signals.By the touch of finger, change the inductance capacitance between two electrodes of position, touch point, thereby change the size of the terminal receiver voltage signal of touch-control sensing electrode Rx, realize touch controllable function.In the touch-control time period, every signal line in the touch-screen and the input of data signal line no signal.
The below is described in detail the concrete structure in the tft array substrate in the above-mentioned touch-screen.
In the specific implementation, signal line in each touch-control drive wire and the tft array substrate can be arranged with layer, like this, when the preparation tft array substrate, do not need to increase extra preparation section, only need to can form by a composition technique figure of signal line and touch-control drive wire, can save preparation cost, the improving product added value.
Further, as shown in Figures 2 and 3, also have many touch-control drive electrodes 9 that extend along the line direction of pixel cell 4 at tft array substrate 2; The gap location of each touch-control drive electrode 9 between adjacent pixel cell 4, and be electrical connected by at least one via hole with overlapping touch-control drive wire 8.
Particularly, because each touch-control drive electrode is arranged on the gap location between the adjacent pixel cell, can not take the open area of each pixel cell, therefore, in the specific implementation, common electrode layer in the array base palte of existing HADS type liquid crystal panel can be cut apart, be positioned at each touch-control drive electrode of pixel cell gap location and the figure that is positioned at the public electrode of pixel cell in common electrode layer formation, namely the public electrode in each touch-control drive electrode and the tft array substrate arranges and a mutually insulated with layer.And in ADS type liquid crystal panel, then touch-control drive electrode and ITO pixel electrode can be arranged with layer and the mutually insulated design.Like this, when the preparation tft array substrate, do not need to increase extra preparation section, only need to can form by a composition technique figure of each touch-control drive electrode and public electrode.
Usually, on the array base palte of tradition ADS type liquid crystal panel, public electrode is positioned at lower floor's (more close underlay substrate) as plate electrode, and pixel electrode is positioned at upper strata (more close liquid crystal layer) as gap electrode, is provided with insulation course between pixel electrode and public electrode.And on the array base palte of HADS type liquid crystal panel, pixel electrode is positioned at lower floor's (more close underlay substrate) as plate electrode, and public electrode is positioned at upper strata (more close liquid crystal layer) as gap electrode, is provided with insulation course between pixel electrode and public electrode.Particularly, pattern according to the concrete display panels of using of above-mentioned touch-screen, the public electrode that forms common electrode layer can have slit-shaped ITO electrode structure or tabular ITO electrode structure in the position corresponding with the open area of pixel cell, namely as shown in Figure 5 when the HADS pattern each public electrode formed by slit-shaped ITO electrode; Particularly, described slit-shaped ITO electrode structure is for having the ITO electrode of slit in the open area of pixel.When the ADS pattern, the public electrode that is positioned at each pixel cell is made of to satisfy the demand of liquid crystal display tabular ITO electrode.Because the concrete structure of the liquid crystal panel of ADS pattern and HADS pattern belongs to prior art, does not repeat them here.
Further, take HADS type liquid crystal panel as example, because touch-control drive electrode and public electrode arrange with layer, both make by normal operation ITO material, and the resistance of ITO material is higher, in order to reduce to greatest extent the resistance of touch-control drive electrode, improves the signal to noise ratio (S/N ratio) of each electrodes transfer electric signal, each touch-control drive electrode and overlapping touch-control drive wire can be electrical connected by at least one via hole, as shown in Figure 3.Be equivalent to ITO electrode and a plurality of metallic resistance parallel connection that is comprised of the touch-control drive wire can be reduced the resistance of electrode so to greatest extent, thus the signal to noise ratio (S/N ratio) when improving the electrodes transfer signal.
Particularly, in the above-mentioned touch screen that the utility model embodiment provides, each touch-control drive electrode shown in Fig. 6 a and Fig. 6 b, can be comprised of at least one horizontal touch-control driven element electrode a and at least one vertical touch-control driven element electrode b that are electrically connected in the specific implementation according to actual needs; Wherein, the horizontal gap location of touch-control driven element electrode a between adjacent pixel cell group; The vertical gap location of touch-control driven element electrode b between the pixel cell of adjacent column.
In like manner, each touch-control sensing electrode shown in Fig. 6 a and Fig. 6 b, can be comprised of at least one horizontal touch-control sensing sub-electrode c and at least one vertical touch-control sensing sub-electrode d that are electrically connected in the specific implementation according to actual needs; Wherein, laterally touch-control sensing sub-electrode c covers two signal lines 5 between the two row pixel cells in the projection on the tft array substrate, with the position of horizontal touch-control driven element electrode a on tft array substrate without overlapping; The gap location of vertical touch-control driven element electrode d between the pixel cell of the adjacent column of the covering of the projection on the tft array substrate except described vertical touch-control driven element electrode, namely vertical driven element electrode d and longitudinal induction sub-electrode b are without overlapping.
In the specific design of above-mentioned this touch-control drive electrode and touch-control sensing electrode, as can be seen from the figure the sub-electrode in touch-control driven element electrode and the touch-control sensing electrode is crisscross arranged, can suitably reduce between touch-control drive electrode and the touch-control sensing electrode over against area, thereby reduce both form over against the zone over against electric capacity, to reduce touching signals to the interference of display, improve touch-control delicately.Comparison diagram 6a and Fig. 6 b are as can be known, Fig. 6 b is with respect to the kind electrode design of Fig. 6 a, can not only further reduce between touch-control drive electrode and the touch-control sensing electrode over against area, can also reduce the coupling capacitance between adjacent vertical touch-control driven element electrode b and the vertical touch-control sensing sub-electrode d, can further reduce touching signals to the interference of display, to improve touch-control sensitivity.
In addition, for further reduce generation between touch-control sensing electrode and the touch-control drive electrode excessive over against electric capacity and coupling capacitance, also touch screen zone is divided in the touch-screen that the utility model embodiment provides: the independent setting area of staggered touch-control drive electrode, the independent setting area of touch-control sensing electrode and public domain; Wherein,
In the independent setting area of touch-control drive electrode, only has the touch-control drive electrode;
In the independent setting area of touch-control sensing electrode, only has the touch-control sensing electrode;
In the public domain, have simultaneously touch-control drive electrode and touch-control sensing electrode.
Particularly, arranging of the independent setting area of touch-control drive electrode, the independent setting area of touch-control sensing electrode and public domain can arrange according to the needs of touch-control precision, no longer describes in detail herein.
For example shown in Figure 7, fine rule represents the transversely touch-control drive electrode of direction of arrow extension in the drawings, thick line represents the along the longitudinal touch-control sensing electrode of direction of arrow extension, touch-screen is divided into 9 zones, wherein, the public domain is B, D and F, has simultaneously the figure of touch-control sensing electrode and touch-control drive electrode in this zone, can produce between the two over against electric capacity and coupling capacitance; The independent setting area of touch-control sensing electrode is G and J, only has the figure of touch-control sensing electrode in this zone, does not have the figure of touch-control drive electrode, therefore can not produce over against electric capacity and coupling capacitance; The independent setting area of touch-control drive electrode is A, C and E, only has the figure of touch-control drive electrode in this zone, does not have the figure of touch-control sensing electrode, therefore can not produce over against electric capacity and coupling capacitance.In the specific implementation, can be according to actual needs over against capacitance and coupling capacitance, design the size in above-mentioned three kinds of zones and distribute.
In the specific implementation, the touch-control sensing electrode 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.
Particularly, because the touch-control sensing electrode that arranges at color membrane substrates can the occluded pixels unit, therefore, the material of touch-control sensing electrode can be specially transparent conductive oxide for example ITO or IZO, also metal can be, when adopting metal to make the touch-control sensing electrode, its resistance can be effectively reduced, and, when using metal to make the touch-control sensing electrode, generally the touch-control sensing electrode is arranged on the black matrix (BM) of color membrane substrates towards the one side of liquid crystal layer.
In addition; can also be positioned at color membrane substrates dorsad liquid crystal layer the antistatic protection film of ground connection simultaneously is set; this diaphragm can play the effect that prevents static; as shown in Figure 8; in order to make antistatic protection film 10 not affect the touch controllable function of touch-screen; generally the antistatic protection film is arranged to fenestral fabric, the mesh that makes the human body electric field can pass the antistatic protection film enters into touch-screen inside.
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 adopt take two adjacent row pixel cells as a pixel cell group at tft array substrate, have the dot structure of two signal lines between this two row pixel cell; Signal line by changing adjacent two row pixel cells and the position of TFT switch, can save the position of signal line between the adjacent pixel cell group, like this, the touch-control drive wire of realizing touch controllable function is arranged on the position of the signal line that saves, and the touch-control sensing electrode is arranged on the color membrane substrates and extends along the column direction of pixel cell, in the situation that guarantees to have than high aperture, realize touch controllable function.
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 (10)
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 formed with in the embedded touch-screen of described condenser type and be a plurality of pixel cells that matrix is arranged; Take every two adjacent row pixel cells as a pixel cell group, having the delegation that two signal lines are respectively this two row pixel cell between this two row pixel cell provides the gated sweep signal; It is characterized in that, also comprise:
Described color membrane substrates has many touch-control sensing electrodes that extend along the column direction of pixel cell;
Described tft array substrate has many touch-control drive wires that extend along the line direction of pixel cell, the gap location of each described touch-control drive wire between adjacent pixel cell group; In the displaying time of a frame picture, described touch-control drive electrode line is used for timesharing ground and transmits common electrode signal and touch scanning signals.
2. touch-screen as claimed in claim 1 is characterized in that, described tft array substrate also has many touch-control drive electrodes that extend along the line direction of pixel cell;
The gap location of each touch-control drive electrode between adjacent pixel cell, and be electrical connected by at least one via hole with overlapping touch-control drive wire.
3. touch-screen as claimed in claim 2 is characterized in that, the signal line in each described touch-control drive wire and the described tft array substrate arranges with layer.
4. touch-screen as claimed in claim 2 is characterized in that, the public electrode in each described touch-control drive electrode and the described tft array substrate or pixel electrode arrange and mutually insulated with layer.
5. such as each described touch-screen of claim 1-4, it is characterized in that each described touch-control drive electrode is comprised of at least one horizontal touch-control driven element electrode and at least one vertical touch-control driven element electrode that are electrically connected; Wherein,
The gap location of described horizontal touch-control driven element electrode between adjacent pixel cell group;
The gap location of described vertical touch-control driven element electrode between the pixel cell of adjacent column.
6. touch-screen as claimed in claim 5 is characterized in that, each described touch-control sensing electrode is comprised of at least one horizontal touch-control sensing sub-electrode and at least one vertical touch-control sensing sub-electrode that are electrically connected; Wherein,
Described horizontal touch-control sensing sub-electrode covers two signal lines between the two row pixel cells in the projection on the tft array substrate;
The gap location of described vertical touch-control driven element electrode between the pixel cell of the adjacent column of the covering of the projection on the tft array substrate except described vertical touch-control driven element electrode.
7. touch-screen as claimed in claim 6 is characterized in that, described touch-screen comprises the independent setting area of staggered touch-control drive electrode, the independent setting area of touch-control sensing electrode and public domain; Wherein,
In the independent setting area of described touch-control drive electrode, only has described touch-control drive electrode;
In the independent setting area of described touch-control sensing electrode, only has described touch-control sensing electrode;
In described public domain, have simultaneously described touch-control drive electrode and described touch-control sensing electrode.
8. 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.
9. such as claim 1 or 8 described touch-screens, it is characterized in that, also comprise: be positioned at the dorsad antistatic protection film of described liquid crystal layer one side and ground connection of described color membrane substrates, described antistatic protection film has fenestral fabric.
10. a display device is characterized in that, comprises such as the embedded touch-screen of each described condenser type of claim 1-9.
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| CN102937853A (en) * | 2012-10-19 | 2013-02-20 | 北京京东方光电科技有限公司 | Capacitance-type embedded touch screen, driving method thereof and display device |
| CN103207720A (en) * | 2013-03-29 | 2013-07-17 | 北京京东方光电科技有限公司 | Method and device for controlling touch display panel, and display device |
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