WO2014153830A1

WO2014153830A1 - Embedded capacitive touch display panel, display device, control device and method

Info

Publication number: WO2014153830A1
Application number: PCT/CN2013/076499
Authority: WO
Inventors: 赵卫杰; 董学; 王海生
Original assignee: 北京京东方光电科技有限公司; 京东方科技集团股份有限公司
Priority date: 2013-03-29
Filing date: 2013-05-30
Publication date: 2014-10-02
Also published as: CN103226423A; CN103226423B

Abstract

Disclosed are an embedded capacitive touch display panel, a display device, a control device and method, for use in implementing the solution of display and touch functions of the display panel while obviating the need for a touch panel to be added, in simplifying the structure of the embedded capacitive touch display panel, and in increasing light transmittance. Provided in the present invention, the embedded capacitive touch display panel comprises: an opposite substrate, an array substrate, and a liquid crystal layer, wherein the array substrate comprises gate wires and data wires in a crisscross arrangement and a transparent common electrode layer; the array substrate also comprises a touch drive electrode arranged on the transparent common electrode layer and extending along a first direction and a touch induction electrode separated from the touch drive electrode via an insulation layer and extending along a second direction, where the first direction and the second direction are perpendicular to each other. A common voltage signal and a touch drive signal are applied time-sharingly on the touch drive electrode.

Description

In-cell capacitive touch display panel, display device, control device and method

The present disclosure relates to the field of liquid crystal technology, and in particular, to an in-cell capacitive touch display panel, a display device, a control device, and a method. Background technique

The current Advanced Super Dimension Switch (ADS) LCD display module has a shielding ITO outside the color film CF. The function is to prevent external interference signals from entering the liquid crystal electric field. Protect the normal display of the LCD display module. For example, an array substrate of a conventional ADS type liquid crystal display is provided with two transparent electrodes, which form a multi-dimensional electric field by an electric field generated by the edge of the slit electrode in the same plane and an electric field generated between the slit electrode layer and the plate electrode layer. All of the aligned liquid crystal molecules between the slit electrodes in the liquid crystal cell and directly above the electrodes can be rotated, thereby improving the liquid crystal working efficiency and increasing the light transmission efficiency.

As shown in FIG. 1, the basic structure of the LCD in the prior art includes: an upper polarizer 201, a shield ITO 30, a color filter substrate, an upper alignment layer 501, a liquid crystal layer 12, a lower alignment layer 502, an array substrate, and a lower polarizer 202. . The color film substrate includes a glass substrate 10, a color film layer 40 (including a color filter RGB and a black matrix); the array substrate includes a village substrate 130, and a gate line 131 and a data line formed on the substrate substrate 130. 132. The gate line 131 and the data line 132 are disposed in different layers, and a first insulating layer 60 is disposed therebetween.

Based on the above structure, the method of implementing capacitive touch is often by attaching a touch function unit to the upper polarizer, and it is necessary to attach a glass for which the touch sensor electrode is formed, which is high, and because of the increase of the bonding process, The yield is reduced, and the thickness greatly affects the transmittance. Summary of the invention

Embodiments of the present invention provide an in-cell capacitive touch display panel, a display device, and a control device. The method of setting and displaying the display panel and the touch function without the need of an additional touch panel, and the structure of the in-cell capacitive touch display panel is integrated, thereby improving the light transmittance.

The embodiment of the present invention provides an in-cell capacitive touch display panel, including an array substrate, a counter substrate, and a liquid crystal layer, wherein the array substrate includes cross-arranged gate lines and data lines, and a transparent common electrode layer; The array substrate further includes:

a touch driving electrode extending along a first direction, wherein the touch driving electrode is located at the transparent common electrode layer;

a touch sensing electrode extending in a second direction, wherein the touch sensing electrode and the touch driving electrode are separated by an insulating layer;

The first direction and the second direction are perpendicular to each other; the common driving voltage and the touch driving signal are applied in a time-sharing manner on the touch driving electrode.

The method for controlling the display and the touch function of the in-cell capacitive touch display panel provided by the embodiment of the invention includes:

And dividing the time of displaying the image of each frame by the display panel into a display time period and a touch time period; applying a common voltage signal to the touch driving electrode during the display time period, and the touch sensing electrode has no signal input;

A touch driving signal is applied to the touch driving electrode during the touch time period, and the touch sensing electrode couples the voltage signal of the touch driving electrode and outputs the voltage signal.

The embodiment of the present invention provides a control device for displaying and touching the in-cell capacitive touch display panel, wherein the display panel displays the time of each frame image into a display time period and a touch time. The control device includes:

a display control unit, configured to apply a common voltage signal to the touch driving electrode during a display period, where the touch sensing electrode has no signal input;

The touch unit is configured to apply a touch driving signal to the touch driving electrode during a touch time period; and the touch sensing electrode couples the voltage signal of the touch driving electrode and outputs the voltage signal.

A display device according to an embodiment of the invention includes the in-cell capacitive touch display panel. The in-cell capacitive touch display panel, the display device, the control device and the control method provided by the embodiments of the present invention apply different signals to a part of the common electrodes located in the transparent common electrode layer in different time periods, so as to be in different time periods. The utility model functions as a common electrode and a touch driving electrode respectively; thus, the normal display of the touch display panel is ensured, and the existing electrode structure is fully utilized, and the touch function of the display panel can be realized without adding a touch driving electrode. At the same time, the aperture ratio of the capacitive touch display panel is increased. DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below. It is obvious that the drawings in the following description relate only to some embodiments of the present invention, rather than to the present invention. limit.

1 is a schematic structural view of a display panel of an LCD product in the prior art;

2 is a schematic structural diagram of a display panel according to an embodiment of the present invention;

Figure 3 is a detailed schematic view of the structure shown in Figure 2;

4 is a schematic diagram of a layered structure of a touch sensing electrode and a touch driving electrode in an in-cell capacitive touch display panel according to an embodiment of the invention;

FIG. 5 is a schematic diagram of a layered structure of a touch sensing electrode and a touch driving electrode in another in-cell capacitive touch display panel according to an embodiment of the invention; FIG.

FIG. 6 is a timing diagram of various signal terminals for controlling display and touch of a display panel according to an embodiment of the present invention. detailed description

The technical solutions of the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings. It is apparent that the described embodiments are part of the embodiments of the invention, rather than all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the described embodiments of the present invention without departing from the scope of the invention are within the scope of the invention. Unless otherwise defined, technical terms or scientific terms used herein shall be of ordinary meaning as understood by those of ordinary skill in the art to which the invention pertains. The words "a", "an" or "the" and the like do not denote a quantity limitation, but mean that there is at least one. The words "including" or "comprising", etc., are intended to mean that the elements or objects that are "included" or "comprising" are intended to be in the Component or object. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to indicate the relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may also change accordingly.

The embodiment of the invention provides an in-cell capacitive touch display panel, a display device, a control device and a method thereof, which can provide display and touch functions of the display panel without an additional touch panel, and integrate the in-cell capacitive touch The structure of the display panel is controlled to increase the light transmittance.

The invention will now be described with reference to the accompanying drawings. It should be noted that the drawings are only schematic structural diagrams and are not true scales. The present invention is not to be construed as limiting the invention.

Referring to FIG. 2, an in-cell capacitive touch display panel is provided. The display panel includes an opposite substrate 11, an array substrate, and a liquid crystal layer 12 between the opposite substrate 11 and the array substrate. The TFT array substrate includes cross-arranged gate lines 131 and data lines 132 formed on the substrate substrate 130, and a common electrode layer 133; the gate lines 131 and the data lines 132 are disposed in different layers, and the two The first substrate is provided with a first insulating layer 60. The array substrate further includes: a touch driving electrode extending along the first direction, wherein the touch driving electrode is located at the transparent common electrode layer 133;

The touch sensing electrode 14 and the touch driving electrode are separated from the touch driving electrode by a second insulating layer (not shown);

The first direction and the second direction are perpendicular to each other, that is, the touch driving electrodes are perpendicular to the touch sensing electrodes; and the common driving voltage and the touch driving signals are applied to the touch driving electrodes in a time sharing manner.

The first direction and the second direction are not specifically limited herein. For example, the first direction can It is the same as the extending direction of the gate line, then the second direction is the same as the extending direction of the data line; or, the first direction is the same as the extending direction of the data line, and the second direction is the same as the extending direction of the gate line.

In the above-mentioned display panel, the common electrode layer 133 includes a plurality of strip-shaped common electrodes. Since the pixel precision of the touch structure is smaller than the pixel precision of the display panel, the present invention provides the A portion of the plurality of strip-shaped common electrodes serves as a touch driving electrode. For example, one of the plurality of strip-shaped common electrodes may be selected as the touch driving electrode for every other common electrode. Of course, one of the two or three common electrodes may be selected as the touch driving electrode. . For example, the strip-shaped common electrode as the touch driving electrode can be flexibly selected according to the precision of the touch. In this way, there is no need to add additional touch sensing electrodes.

For example, the touch sensing electrode has a grid structure and the material is metal. The position of the grid-shaped touch sensing electrode is corresponding to the black matrix area, that is, the grid-shaped touch sensing electrode corresponds to the wiring area of the gate line and the data line, so that the corresponding area of the touch sensing electrode is also No additional occlusion is required, which increases the aperture ratio of the capacitive touch display panel.

In the embodiment and the corresponding drawings, the touch driving electrodes are arranged along the gate line direction, and the touch sensing electrodes are arranged along the data line direction as an example. The display panel may further include, for example, a metal electrode 15 (see FIG. 3) disposed above or below the touch driving electrode and electrically connected to the touch driving electrode. The metal electrode 15 may be in direct contact with the touch driving electrode. Since the transparent common electrode layer in the embodiment is usually made of ITO material, after the metal electrode 15 is added above or below the touch control driving electrode, the overall resistance of the touch driving electrode can be significantly reduced.

The metal electrode may have, for example, a grid-like structure, and the grid-shaped metal electrode is located at a position corresponding to the black matrix region. Similarly, since the metal electrode connected to the touch driving electrode is also a wiring region corresponding to the gate line and/or the data line, it does not affect the opening ratio of the touch display panel.

Further, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

FIG. 2 and FIG. 3 are schematic diagrams showing the structure of an in-cell capacitive touch display panel according to the present invention. The display panel includes: a counter substrate 11, a liquid crystal layer 12, an array substrate, and the array substrate. A touch driving electrode and a touch sensing electrode 14 are formed on the top.

For example, the opposite substrate 11 includes a glass substrate 10, a color film layer 40, an upper polarizer 201 is disposed on an outer side of the opposite substrate, and an upper alignment layer 501 is disposed on an inner side thereof;

It should be noted that, in this embodiment, the color film layer 40 is located on the opposite substrate, and the opposite substrate is also referred to as a color film substrate; in addition, the color film layer can also pass the COA (Color Filter On Array technology is fabricated on the array substrate.

The array substrate includes: a substrate substrate 130, a gate line 131 formed on the substrate substrate 130, a data line 132, and a transparent common electrode layer 133; and a lower alignment layer 502 over the touch sensing electrode, and The lower polarizer 202 is located below the substrate substrate 130.

The transparent common electrode layer 133 includes a common electrode 133a (see FIG. 4) and a touch driving electrode 133b (see FIG. 4). The common driving voltage and the touch driving signal are applied to the touch driving electrode 133b in a time sharing manner. . In a specific implementation process, a common voltage signal is applied to the touch driving electrode 133b during a display period, and the touch driving electrode 133b functions as a common electrode, and is used together with the pixel electrode to control liquid crystal inversion; A touch driving signal is applied to the touch driving electrode 133b, and the touch sensing electrode 14 is coupled to the voltage signal of the touch driving electrode and output. After detecting the coupling signal outputted by the touch sensing electrode 14 , the touch determination module located in the surrounding area can determine the specific position corresponding to the touch action and achieve accurate touch positioning.

The common electrode 133a is only connected to a common voltage signal and is used together with the pixel electrode to control liquid crystal inversion.

The touch driving electrode 133b is made of a transparent conductive material ITO, and the touch electrode has a large resistance in the extending direction, which is not conducive to signal transmission; as shown in FIG. 5, in order to improve signal transmission quality, For example, a metal electrode 15 may be further disposed above the touch driving electrode, and the metal electrode 15 is electrically connected to the touch driving electrode 133b.

For example, the metal electrode 15 has a grid-like structure, and the grid-shaped metal electrode is located at a position corresponding to the black matrix region and located below the black matrix region.

The array substrate further includes a passivation layer 16 over the metal electrode for insulating the touch electrode from other electrodes. The passivation layer 16 is made of a resin; however, the passivation layer may also be Other materials are used as long as they are transparent insulating materials.

As shown in FIG. 3 and FIG. 4, the touch sensing electrodes 14 are located above the passivation layer 16 and may have a grid-like structure. Moreover, the grid-shaped touch sensing electrodes extend in the data line direction.

Since the upper surface of the touch driving electrode 133b corresponds to the black matrix region, no additional occlusion is needed for the touch driving electrode, thereby increasing the opening ratio after the wiring of the gate line 131 and the data line 132, and improving the display quality. In addition, the touch sensing electrodes 14 and the touch driving electrodes 133b are disposed on the array substrate side, which facilitates the extraction of the touch sensing electrodes and the touch driving electrode pins, thereby facilitating the binding of the flexible circuit board FPC.

4 is a schematic view showing a layered structure of a touch sensing electrode and a touch driving electrode in an in-cell capacitive touch display panel. The touch sensing electrode 14 is along the direction of the data line in the TFT array substrate, the touch driving electrode 133b and the touch sensing electrode are perpendicular to each other, and each of the two touch driving electrodes are parallel to each other, and each of the two touches A common electrode 133a is disposed between the control drive electrodes. During the touch phase, the touch sensing electrodes are respectively connected to the touch sensing signals (for example, the current flowing signals), and the touch driving electrodes are respectively connected to the touch driving signals. At the same time, the common electrode layer including the common electrode 133a and the touch driving electrode 133b has a planar structure. Generally, the common electrode layer covers the surface of the entire array substrate, and is generally made of ITO. The structure and material of the common electrode layer are used. Both are prior art and will not be described here.

Further, as shown in FIG. 5, a grid-shaped metal electrode is disposed above the touch driving electrode 133b, and the metal electrode is electrically connected to the touch driving electrode 133b, and the position corresponds to the black matrix region. Below the black matrix area. Here, a metal electrode of the electrical connection is added. Since the material of the metal electrode is metal, the resistance is smaller than that of the common electrode made of ITO, and the metal electrode is connected in parallel to the touch driving electrode. After that, the resistance of the final touch driving electrode is much smaller, which effectively reduces the load of the touch chip and improves the accuracy of the touch. At the same time, the density of the metal electrodes can be designed in advance according to display accuracy requirements to meet different display requirements.

Moreover, the metal electrode is disposed on the touch driving electrode, and has the same shape as the touch driving electrode, and the position corresponds to the black matrix region, so the light transmittance is not affected, and at the same time, Additional occlusion is added to increase the metal electrode.

The present invention provides a control method for displaying and touching the display panel, and the control method includes:

Further, the time of each frame of image is divided into a display time display and a touch time touch in advance, and the display function and the touch function of the display panel are respectively implemented in the display time and the touch time. Referring to the timing diagram shown in FIG. 6, where STV is a frame enable signal, CPV is a gate turn-on control signal, TP is a data turn-on signal, Gate is an open signal of each row of gate lines, Data is a data signal for each column, TE is The touch-on control signal, TX is a touch drive signal, and RX is a touch-sensing signal.

In the display time display, the touch driving electrode and the common electrode are connected to a common voltage signal.

The gate signal is sequentially input downward from the first row to each row of gate lines so that each row of pixels is turned on line by line, and the data lines sequentially output corresponding data signals, so that the pixel electrode and the common electrode form an electric field to control the liquid crystal inversion of the corresponding pixel to complete the display.

In the touch time of each frame, the touch starts from the start of the TE signal. In this stage, the touch driving driving electrode is connected to the touch driving signal, and the touch sensing electrode is connected to the touch sensing signal; and the common electrode is connected to the common voltage signal; At the same time, there is no signal on all the gate lines, and the data lines are not output; until the TE signal is turned off, the display time of the next frame image is started.

The time-sharing driving method provided by the embodiment of the invention (dividing the display time of one frame into the display time period and the touch time period) effectively avoids interference of the touch signal on the display signal in the touch phase, and improves the display. quality.

The control device for displaying and touching the foregoing display panel provided by the embodiment of the invention includes: a display control unit, configured to apply a common voltage signal to the touch driving electrode during a display period, where the touch sensing electrode has no signal input;

In addition, an embodiment of the present invention further provides a display device, where the display device includes the above-described in-cell capacitive touch display panel.

The display device may further include the above-mentioned control device, and the control device is configured to control display and touch of the in-cell capacitive touch display panel.

In summary, the in-cell capacitive touch display panel, the display device, the control device and the method provided by the embodiments of the present invention use the touch drive electrode and the touch sensing electrode on the array substrate to utilize the common on the array substrate A part of the electrode layer is used as a touch driving electrode, and a touch sensing electrode is disposed on the common electrode layer, and a passivation layer is disposed between the touch driving electrodes and the touch sensing electrode, and the method of time division driving is Realize the display panel display and touch function. Since the position of the touch sensing electrode corresponds to the black matrix area, no additional blocking is required, so the aperture ratio of the pixel structure can be maintained, and the common electrode with the gate line disposed below is used as the touch driving electrode of the touch stage. , no need to make a touch drive electrode separately, saving cost. In addition, the touch driving electrodes and the touch sensing electrodes are disposed on the side of the TFT array substrate, which facilitates pinout of the touch driving electrodes and the touch sensing electrodes to facilitate binding of the flexible circuit board FPC.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) in which computer usable program code is embodied.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a general purpose computer, a special purpose computer, An embedded processor or processor of another programmable data processing device to generate a machine such that instructions executed by a processor of a computer or other programmable data processing device are generated for implementation in a flow or a flow of flowcharts and/or Or a block diagram of a device in a box or a function specified in a plurality of boxes.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

The above is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. The scope of the present invention is defined by the appended claims.

Claims

claims

1. An in-cell capacitive touch display panel, including an array substrate, a facing substrate and a liquid crystal layer, wherein the array substrate includes cross-arranged gate lines and data lines, and a transparent common electrode layer; wherein, the The array substrate also includes:

Touch driving electrodes extending along the first direction, the touch driving electrodes are located on the transparent common electrode layer; and,

a touch sensing electrode extending along the second direction, the touch sensing electrode and the touch driving electrode being isolated by an insulating layer;

Wherein, the first direction and the second direction are perpendicular; a common voltage signal and a touch drive signal are applied to the touch drive electrode in a time-sharing manner.

2. The in-cell capacitive touch display panel according to claim 1, wherein the touch sensing electrodes have a grid-like structure; and the grid-shaped touch sensing electrodes are located in a position consistent with the black matrix. Area i or corresponding.

3. The in-cell capacitive touch display panel according to claims 1-2, wherein the display panel further includes: a metal electrode disposed above or below the touch driving electrode, the metal electrode and the The touch driving electrodes are electrically connected.

4. The in-cell capacitive touch display panel according to claim 3, wherein the metal electrode has a grid-like structure, and the location of the grid-shaped metal electrode corresponds to the black matrix area.

5. The in-cell capacitive touch display panel according to any one of claims 1 to 4, wherein the extension direction of the touch driving electrode and the gate line are consistent; and the touch sensing electrode is consistent with the extension direction of the gate line. The extension directions of the above data lines are consistent.

6. A control method for realizing the display and touch functions of the embedded capacitive touch display panel according to any one of claims 1 to 5, including:

The time during which the display panel displays each frame of image is divided into a display time period and a touch time period; during the display time period, a common voltage signal is applied to the touch drive electrode, and there is no signal input to the touch sensing electrode;

During the touch period, a touch drive signal is applied to the touch drive electrode, and the touch sensing electrode couples the voltage signal of the touch drive electrode and outputs it.

7. A control device for displaying and touching the in-cell capacitive touch display panel according to any one of claims 1 to 5, wherein the time for the display panel to display each frame of image is divided into display time segment and touch time segment; the control device includes:

A display control unit, configured to apply a common voltage signal to the touch driving electrode during the display time period, and the touch sensing electrode has no signal input;

The touch unit is configured to apply a touch drive signal to the touch drive electrode during the touch period; the touch sensing electrode couples the voltage signal of the touch drive electrode and outputs it.

8. A display device, wherein the display device includes the in-cell capacitive touch display panel according to any one of claims 1 to 5.

9. The display device according to claim 8, wherein the display device further includes the control device according to claim 7, the control device being used to control the display and touch of the in-cell capacitive touch display panel. control.