WO2015196712A1

WO2015196712A1 - Touch display panel and display device

Info

Publication number: WO2015196712A1
Application number: PCT/CN2014/091718
Authority: WO
Inventors: 丁小梁; 董学; 王海生; 刘英明; 任涛
Original assignee: 京东方科技集团股份有限公司; 北京京东方光电科技有限公司
Priority date: 2014-06-24
Filing date: 2014-11-20
Publication date: 2015-12-30
Also published as: CN104216584A; CN104216584B

Abstract

A touch display panel. The touch display panel comprises a plurality of touch driving electrodes (10) located on a substrate and a plurality of touch sensing electrodes (20) arranged to be insulated from the plurality of touch driving electrodes (10), and the touch sensing electrodes (20) and the touch driving electrodes (10) are arranged to intersect each other. The touch display panel also comprises shielding electrodes (30), the orthographic projections of the shielding electrodes (30) on the substrate are located between the orthographic projections of the touch driving electrodes (10) on the substrate and the orthographic projections of the touch sensing electrodes (20) on the substrate, and the orthographic projections of the shielding electrodes (30) on the substrate do not overlap the orthographic projections of the touch driving electrodes (10) on the substrate. And a display device. The amount of signals changes dramatically after a touch on a touch point of the touch display panel.

Description

Touch display panel and display device

Technical field

The present invention relates to the field of touch display, and in particular to a touch display panel and a display device including the touch display panel.

Background technique

Compared with keyboards and mice, touch screens provide users with better convenience as an input medium. According to different implementation principles, the touch screen can be divided into a resistive touch screen, a capacitive touch screen, a surface acoustic wave touch screen, an infrared touch screen, and the like. Currently widely used are resistive touch screens and capacitive touch screens.

Mutual capacitive touch display panels are increasingly sought after for their high sensitivity and multi-touch advantages. FIG. 1 is a schematic diagram of a common mutual capacitive touch display panel. As shown in FIG. 1 , the mutual capacitive touch display panel includes a plurality of touch driving electrodes 10 for the plurality of touch driving electrodes. 10, a driving signal source 101 for driving signals, a plurality of touch sensing electrodes 20, and a detecting circuit 106 for detecting induced signals on the plurality of touch sensing electrodes 20, and a capacitance can be formed between the touch driving electrodes 10 and the touch sensing electrodes 20, The touch driving electrodes 10 include a plurality of touch driving sub-electrodes 100, and one touch sensing electrode 20 is disposed between adjacent two columns of touch driving sub-electrodes 100.

The basic principle of the mutual capacitance type touch panel shown in FIG. 1 is that a voltage is applied to the side of the touch driving electrode 10, and a signal change is detected on the side of the touch sensing electrode 20. The touch drive electrodes determine the x-direction coordinates, and the touch sense electrodes determine the y-direction coordinates. During the detection, the x-direction touch driving electrodes are progressively scanned, and when each row of the touch driving electrodes is scanned, the signals on each of the touch sensing electrodes are read, and each row and column can be scanned by one round of scanning. To, a total of x * y signals are scanned. This detection method can specifically determine the coordinates of multiple points, so multi-touch can be realized.

Shown in Figure 2 is an equivalent circuit diagram of the mutual capacitive touch screen shown in Figure 1. The driving signal source 101 provides an electrical signal for the touch driving electrode, and there is a drive on the touch driving electrode. The movable electrode resistor 103 forms a mutual capacitance 102 between the touch driving electrode and the touch sensing electrode, and a parasitic capacitance 104 is formed between the touch driving electrode and the common electrode layer and between the touch sensing electrode and the common electrode layer, and the sensing electrode resistance exists on the touch sensing electrode. 105. The touch sensing electrode is connected to the detecting circuit 106. When the finger touches the mutual capacitive touch screen, a part of the current flows into the finger, which is equivalent to a mutual capacitance change between the touch driving electrode and the touch sensing electrode, and the resulting weak current change can be detected at the detecting end.

When detecting the position coordinates of the touched point, it is necessary to detect the change in the amount of the signal before and after the touch at the touched point. The greater the change in the amount of semaphores before and after the touch point, the easier it is to be detected, so that the position coordinates of the touched point can be accurately determined. Therefore, how to increase the semaphore change before and after the touch at the touch point is a technical problem to be solved in the art.

Summary of the invention

An object of the present invention is to provide a touch display panel and a display device, wherein the amount of signals before and after the touch at the touch point of the touch display panel changes greatly.

In order to achieve the above object, as one aspect of the present invention, a touch display panel includes a plurality of touch driving electrodes on a substrate and a plurality of touches insulated from the plurality of touch driving electrodes a sensing electrode, the touch sensing electrode is disposed to intersect with the touch driving electrode, wherein the touch display panel further includes a shielding electrode, and an orthographic projection of the shielding electrode on the substrate is located on the substrate of the touch driving electrode An orthographic projection is between the orthographic projection of the touch sensing electrode on the substrate, and an orthographic projection of the shield electrode on the substrate does not overlap with an orthographic projection of the touch drive electrode on the substrate.

Preferably, the frequency of the drive signal input to the touch drive electrode is greater than or equal to 5 MHz.

Preferably, the shielding electrode is disposed in the same layer as the touch sensing electrode.

Preferably, the shielding layer extends in the same direction as the touch sensing electrode, and the length of the shielding layer is the same as the touch sensing electrode.

Preferably, the shielding electrode and the touch sensing electrode are disposed in different layers, and an insulating layer is disposed between the shielding electrode and the touch sensing electrode.

Preferably, the orthographic projection of the shielding electrode on the substrate of the touch display panel And an orthogonal projection portion of the touch sensing electrode on the substrate of the touch display panel.

Preferably, the shield electrode is made of a transparent electrode material or a metal material.

Preferably, the touch display panel includes an array substrate and a counter substrate disposed oppositely, the touch driving electrodes are disposed on the array substrate of the touch display panel, and the touch sensing electrodes are disposed on the touch display On the counter substrate of the panel, the common electrode layer of the array substrate includes a plurality of the touch driving electrodes and a plurality of common electrodes insulated from each other, the touch driving electrodes are disposed to intersect with the common electrodes, and the touch sensing electrodes are disposed at An orthographic projection on the array substrate is located in an area where the common electrode is located,

The display time of the one frame of the touch display panel includes a display phase and a touch phase. In the display phase, each of the touch driving electrodes is configured to transmit a common electrode signal, and in the touch phase, each The touch drive electrode is for transmitting a drive signal.

Preferably, the shield electrode is connected to a common electrode signal.

As another aspect of the present invention, a display device including the above touch display panel provided by the present invention is provided.

After the shielding electrode is added between the touch sensing electrode and the touch driving electrode, when the touch display panel is in the touch phase, the shielding signal is inserted into the shielding electrode, thereby reducing the difference between the touch sensing electrode and the touch driving electrode before the touch operation. The mutual capacitance reduces the amount of signals on the touch sensing electrodes before the touch, thereby increasing the amount of signal change calculated by the detection circuit, so that the position coordinates of the touch points can be determined more accurately.

DRAWINGS

The drawings are intended to provide a further understanding of the invention, and are intended to be a In the drawing:

1 is a circuit diagram of a conventional touch display panel;

2 is an equivalent circuit diagram of the touch display panel shown in FIG. 1;

3 is a schematic circuit diagram of a touch display panel provided by the present invention;

4 is a cross-sectional view showing an embodiment of a touch display panel provided by the present invention;

FIG. 5 is a cross-sectional view showing another embodiment of the touch display panel provided by the present invention.

detailed description

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative and not restrictive.

As shown in FIG. 3 , as one aspect of the present invention, a touch display panel is provided, which includes a plurality of touch driving electrodes 10 on a substrate and is insulated from the plurality of touch driving electrodes 10 The plurality of touch sensing electrodes 20 are disposed at the intersection of the touch sensing electrodes 20 and the touch driving electrodes 10, wherein the touch display panel further includes a shielding electrode 30, and the orthographic projection of the shielding electrode 30 on the substrate is located at the touch driving electrode 10 An orthographic projection on the substrate of the touch display panel and an orthographic projection of the touch sensing electrode 20 on the substrate, and an orthographic projection of the shield electrode 30 on the substrate and the touch driving electrode 10 on the substrate The orthographic projections do not overlap. It should be understood that the orthographic projection of the shield electrode 30 and the orthographic projection of the touch drive electrode 10 should be relative to the same substrate, for example, both on the array substrate, or both in the box with the array substrate. Projection on the substrate of the cassette.

In the present invention, the shape of the touch driving electrode 10 is not specifically limited. For example, as a specific embodiment of the present invention, as shown in a rectangular frame surrounded by a two-dot chain line in FIG. The touch driving electrodes 10 may each include a plurality of touch driving sub-electrodes 100 arranged in a row, and the plurality of touch driving sub-electrodes 100 in each of the touch driving electrodes 10 are sequentially electrically connected such that the touch driving electrodes 10 are in phase with the touch sensing electrodes 20 Cross settings.

In the present invention, there is no particular limitation on the specific shape of the shield electrode 30. The orthographic projection of the shielding electrode 30 on the substrate of the touch display panel does not overlap with the orthographic projection of the touch driving electrode 10 on the substrate of the touch display panel, and the orthographic projection of the shielding electrode 30 on the substrate of the touch display panel One side is an orthographic projection of the touch driving electrode 10 on the substrate of the touch display panel, and the other side of the orthographic projection of the shielding electrode 30 on the substrate of the touch display panel is the substrate of the touch sensing electrode 20 on the touch display panel. The orthographic projection on the upper side, therefore, as shown in FIG. 3, the shield electrode 30 can be set as the shield electrode 30 The extending direction is the same as the extending direction of the touch sensing electrode 20. The shield electrode 30 may be a strip electrode parallel to the touch sensing electrode 20 or a plurality of shield electrode blocks connected in series along the extending direction of the touch sensing electrode 20.

It should be understood by those skilled in the art that the display device including the touch display panel may include a driving signal source 101 for providing driving signals for the plurality of touch driving electrodes 10 and detecting the sensing signals on the plurality of touch sensing electrodes 20 The detecting circuit 106 and, since the touch driving electrode 10 is insulated from the touch sensing electrode 20, a capacitance can be formed between the touch driving electrode 10 and the touch sensing electrode 20.

When the touch operation is performed on the touch display panel, the shield signal can be connected to the shield electrode 30. As shown in FIG. 3, the touch driving sub-electrode 100 of the touch driving electrode 10 is horizontally adjacent to the touch sensing electrode 20, and therefore, the electric field in the equivalent capacitor formed between the touch driving electrode 10 and the touch sensing electrode 20 is mainly horizontal. The electric field in the direction. When the finger of the operator touches the touch display panel, a part of the current flows into the finger, which is equivalent to the mutual capacitance change between the touch driving electrode 10 and the touch sensing electrode 20, and the detecting circuit 106 can detect the resulting result. Weak current changes.

The touch display panel provided by the present invention is particularly suitable for a high frequency driven touch display panel, that is, preferably, the frequency of the driving signal input to the touch driving electrode is greater than or equal to 5 MHz.

Before and after the touch operation occurs, the amount of signals on the touch sensing electrode 20 increases from small to large. The detecting circuit 106 calculates that the signal change amount ΔS at the touch point is the signal amount S ₁ on the touch sensing electrode 20 before the touch minus the absolute value of the signal amount S ₂ on the touch sensing electrode 20 after the touch, that is, ΔS= |S ₁ -S ₂ |.

As long as the contact area between the finger and the touch driving electrode 10 and the touch sensing electrode 20 is ensured, the signal amount S ₂ on the touch sensing electrode 20 after the touch can be kept unchanged, and the signal amount S on the touch sensing electrode 20 before the touch _{1 is} affected by mutual capacitance between the touch sensing electrode 20 and the touch driving electrode 10. According to the above definition, the signal change amount ΔS=|S ₁ -S ₂ | at the touch point on the touch display panel, and the amount of the signal on the touch sensing electrode 20 increases from small to large before and after the touch operation occurs (ie, S _{2 is} greater than S ₁ ), then ΔS = S _{2 -} S ₁ . If the mutual capacitance between the touch sensing electrode 20 and the touch driving electrode 10 before the touch is reduced, the amount of signal S ₁ on the touch sensing electrode 20 before the touch can be reduced, and the detected signal variation ΔS can be increased. After the shield electrode 30 is added between the touch sensing electrode 20 and the touch driving electrode 10, when the touch display panel is in the touch phase, the shielding signal is inserted into the shielding electrode 30, so that the touch sensing electrode 20 can be reduced before the touch operation. The mutual capacitance between the driving electrodes 10 is touched, thereby reducing the signal amount S ₁ on the touch sensing electrode 20 before the touch, whereby the signal variation ΔS calculated by the detecting circuit 106 can be increased, so that the touch can be determined more accurately. The position coordinates of the point.

It should be understood by those skilled in the art that the touch sensing electrode 20 is connected to the touch signal source in addition to the detecting circuit 106. The setting of the touch signal source is well known in the art and will not be described herein.

In the touch display panel provided by the present invention, there is no special requirement for the specific setting positions of the touch driving electrode 10 and the touch sensing electrode 20. For example, the touch driving electrode 10 and the touch sensing electrode 20 may be disposed on the same layer. In this case, the touch display panel may further include a connection line disposed on the touch driving sub-electrode 100 of the touch driving electrode 10 at a different layer, and connected to the touch driving sub-electrode 100 via the via hole, so that The touch driving sub-electrodes 100 in one row are electrically connected, and the connecting lines are connected to a driving signal source to provide a touch driving signal for the touch driving electrodes 10.

Alternatively, as shown in FIGS. 4 and 5, the touch driving electrodes 10 may be disposed at different layers from the touch sensing electrodes 20.

In the present invention, the specific shape and arrangement of the shield electrode 30 are not particularly limited as long as the shield electrode 30 can be disposed in the horizontal interval between the touch driving sub-electrode 100 of the touch driving electrode 10 and the touch sensing electrode 20. And the mutual capacitance between the touch driving electrode 10 and the touch sensing electrode 20 can be reduced. For example, each of the shield electrodes 30 may be a strip formed by connecting a plurality of shield electrode blocks in series, or may be a strip similar to the touch sensing electrodes 20.

In the present invention, the manner in which the shield electrode 30 is disposed is also not particularly limited. For example, as shown in FIG. 4, the shield electrode 30 may be disposed in the same layer as the touch sensing electrode 20. In this case, the extending direction of the shield electrode 30 is the same as the extending direction of the touch sensing electrode 20, and preferably, the length of the shield electrode 30 is also the same as the length of the touch sensing electrode 20.

Alternatively, as shown in FIG. 5, the shield electrode 30 and the touch sensing electrode 20 are disposed at no In the same layer. In this case, preferably, an insulating layer 80 is disposed between the shield electrode 30 and the touch sensing electrode 20.

When the shielding electrode 30 and the touch sensing electrode 20 are disposed in different layers, in order to better achieve the shielding effect, preferably, the orthographic projection of the shielding electrode 30 on the substrate of the touch display panel and the touch sensing electrode 20 are The orthographic projections on the substrate of the touch display panel may partially overlap, but may not overlap with the orthographic projection of the touch driving electrodes on the substrate of the touch display panel, and the shielding electrodes 30 are on the substrate of the touch display panel. The orthogonal projection of the orthographic projection and the touch sensing electrode 20 on the substrate of the touch display panel can better block the power line projection of the touch driving electrode 10 to the touch sensing electrode 20 in the screen, thereby better shielding effect.

The touch display panel provided by the present invention may be a liquid crystal display panel, and the touch display panel includes an array substrate B, a pair of box substrates A disposed on the array substrate B, and the array substrate B and the counter substrate A. The liquid crystal layer 50 between them is as shown in FIGS. 4 and 5. Correspondingly, the touch driving electrode 10 can be disposed on the array substrate B of the touch display panel, and the touch sensing electrode 20 can be disposed on the counter substrate A of the touch display panel. Therefore, the touch display panel provided by the present invention is an in-cell touch display panel, which has high integration and small thickness, and meets the requirements of the user.

Preferably, the common electrode layer of the array substrate B includes a plurality of touch driving electrodes 10 and a plurality of common electrodes 40 insulated from each other (here, the touch driving electrodes and the common electrodes are insulated from each other), the touch driving electrodes 10 and the common electrodes 40 is arranged in an intersection, and the orthographic projection of the touch sensing electrode 20 on the array substrate B is located in the region where the common electrode 40 is located. As an embodiment of the present invention, the shape of the orthographic projection of the touch driving electrode 10 and the touch sensing electrode 20 on the array substrate B may be the same as the shape of the orthographic projection of the touch driving electrode 10 and the common electrode 40 on the array substrate B.

In the embodiment shown in FIG. 3 to FIG. 5 , the touch driving electrode 10 can be disposed in the same layer as the common electrode 40 of the touch display panel, and one column of the touch driving electrodes 10 is spaced apart from the common electrode (ie, adjacent to the two A column of touch driving electrodes is disposed between the common electrodes, or a common electrode 40 is disposed between the adjacent two columns of touch driving electrodes, and correspondingly, the orthographic projection of the touch sensing electrodes 20 on the array substrate is located in the public electric In the area where the pole is located.

Preferably, the display time of one frame of the touch display panel includes a display phase and a touch phase, in which each touch driving electrode 10 is configured to transmit a common electrode signal during the touch phase. Each of the touch drive electrodes is for transmitting a drive signal (ie, a drive signal provided by the drive signal source 101). In the display phase, the use of the touch drive electrode to transmit the common electrode signal can increase the electric field strength between the pixel electrode layer (including the plurality of pixel electrodes) of the display panel and the common electrode layer, thereby facilitating the flipping of the liquid crystal molecules, thereby improving the display panel. The quality of the display.

In order to increase the aperture ratio of the touch display panel, preferably, the shield electrode 30 may be formed using a transparent electrode material (for example, ITO). Of course, the invention is not limited thereto, and the shielding electrode can also be made of a metal material.

As described above, during the touch cycle, the shield signal is inserted into the shield electrode 30, and the shield signal may be grounded or may be a fixed voltage signal. In the present invention, the specific device for providing the shielding signal is not particularly limited. For example, in order to simplify the structure of the touch display panel, preferably, the shielding signal for accessing the shield electrode 30 is a common electrode signal.

The display time of one frame of the touch display panel includes a display phase and a touch phase, and the shield electrode accesses the common electrode signal during the touch phase.

As described above, the touch display panel provided by the present invention is an embedded liquid crystal display panel. Therefore, in order to avoid affecting the deflection of liquid crystal molecules in the touch display panel, preferably, during the display phase, the shielding The electrode is floating and no signal is connected.

As shown in FIG. 4 and FIG. 5, the color filter layer 60 and the black matrix 70 may be disposed on the counter substrate A of the touch display panel. The arrangement of the color film layer 60 and the black matrix 70 is well known in the art. , no longer repeat them here. As described above, on the array substrate B, the touch driving sub-electrode 100 of the touch driving electrode 10 may be spaced apart from the common electrode 40.

As another aspect of the present invention, a display device is provided, wherein the display device comprises the above touch display panel provided by the present invention.

The display device provided by the present invention may be a mobile phone, a tablet computer or the like. After the shielding electrode is added between the touch sensing electrode and the touch driving electrode, when the touch display panel is in the touch phase, the shielding signal is inserted into the shielding electrode, which can reduce the touch feeling before the touch operation. The mutual capacitance between the electrode and the touch driving electrode reduces the amount of signals on the touch sensing electrode before the touch, thereby increasing the amount of signal change calculated by the detecting circuit, thereby more accurately determining the position of the touch point. coordinate.

It is to be understood that the above embodiments are merely exemplary embodiments employed to explain the principles of the invention, but the invention is not limited thereto. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and scope of the invention. These modifications and improvements are also considered to be within the scope of the invention.

Claims

A touch display panel includes a plurality of touch driving electrodes on a substrate and a plurality of touch sensing electrodes disposed in insulation with the plurality of touch driving electrodes, the touch sensing electrodes intersecting the touch driving electrodes The touch display panel further includes a shielding electrode, an orthographic projection of the shielding electrode on the substrate is located on an orthographic projection of the touch driving electrode on the substrate, and the touch sensing electrode is Between the orthographic projections on the substrate, and the orthographic projection of the shield electrode on the substrate does not overlap with the orthographic projection of the touch drive electrode on the substrate.
The touch display panel according to claim 1, wherein the frequency of the driving signal input to the touch driving electrode is greater than or equal to 5 MHz.
The touch display panel according to claim 2, wherein the shielding electrode is disposed in the same layer as the touch sensing electrode.
The touch display panel according to claim 3, wherein the shielding layer extends in the same direction as the touch sensing electrode, and the length of the shielding layer is the same as the touch sensing electrode.
The touch display panel according to claim 2, wherein the shielding electrode and the touch sensing electrode are disposed in different layers, and an insulating layer is disposed between the shielding electrode and the touch sensing electrode.
The touch display panel according to claim 5, wherein the front projection of the shielding electrode on the substrate of the touch display panel and the touch sensing electrode on the substrate of the touch display panel The orthographic projections partially overlap.
The touch display panel of claim 1 , wherein the touch display panel comprises an array substrate and a counter substrate disposed opposite to each other, the touch driving electrode The touch sensing electrodes are disposed on the array substrate of the touch display panel, and the array substrate includes a common electrode layer, and the common electrode layer includes a plurality of insulating layers. The touch driving electrodes and the plurality of common electrodes, the touch driving electrodes are disposed to intersect with the common electrodes, and the orthographic projection of the touch sensing electrodes on the array substrate is located in a region where the common electrodes are located.
The touch display panel of claim 7 , wherein the display time of the one frame of the touch display panel comprises a display phase and a touch phase, wherein each of the touch driving electrodes is in the display phase For transmitting a common electrode signal, each of the touch driving electrodes is configured to transmit a driving signal during the touch phase.
The touch display panel according to claim 8, wherein the shield electrode is connected to a common electrode signal.
The touch display panel according to any one of claims 1 to 9, wherein the shield electrode is made of a transparent electrode material or a metal material.
A display device comprising the touch display panel according to any one of claims 1 to 10.