CN113655914A

CN113655914A - Array substrate, touch display panel and touch display device

Info

Publication number: CN113655914A
Application number: CN202111013851.6A
Authority: CN
Inventors: 查宝
Original assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2021-11-16
Anticipated expiration: 2041-08-31
Also published as: CN113655914B

Abstract

The application discloses array substrate, touch-control display panel and touch-control display device, array substrate includes: a first substrate; a plurality of touch electrodes disposed on the first substrate; the driving circuit layer is arranged on one side, far away from the first substrate, of the touch electrode, and a plurality of touch thin film transistors are formed in the driving circuit layer; each touch electrode is connected with at least one touch thin film transistor to form a touch unit. The array substrate, the touch display panel and the touch display device prevent signal crosstalk and shielding of the pixel electrode and/or the common electrode, can reduce the number of ICs, and are favorable for popularization of an In-cell touch technology In display panels, particularly large-size display panels.

Description

Array substrate, touch display panel and touch display device

Technical Field

The application relates to the technical field of display, in particular to an array substrate, a touch display panel and a touch display device.

Background

With the development of display technology, more and more functions are integrated in the display, and new functions are synchronously given to the display. For example, a display, which is an important bridge for human-computer interaction, is required to have a function of sensing a command issued by a human. To achieve the above functions, a touch sensor is integrated in a display.

Touch technology has evolved from On-glass to On-cell, up to the present In-cell mode. The development of integrating touch control function into large screen display tends to be slow. At present, an On-glass mode is generally adopted. While the In-cell has significant advantages of low Module (MOD) thickness and high signal-to-noise ratio, the touch mode is mainly applied to the display mode of In-Plane Switching (IPS) or Fringe Field Switching (FFS).

Currently, In-cell touch technology mainly adopts a self-capacitance electrode (PAD) mode. The drawback of this mode is that the display panel of the PAD mode, especially the large-sized display panel, requires a huge number of outgoing lines Pin and a large number of driving chips (ICs), which undoubtedly bring about a sharp increase in cost.

Furthermore, the conventional In-cell touch technology also has the problems of signal crosstalk and shielding of the pixel electrode and/or the common electrode, which affects the accuracy and sensitivity of touch detection.

Therefore, it is desirable to provide an array substrate, a touch display panel and a touch display device to solve the above technical problems.

Disclosure of Invention

In order to solve the above technical problems, the present application provides an array substrate, a touch display panel and a touch display device, which can prevent signal crosstalk and shielding of a pixel electrode and/or a common electrode, reduce the number of ICs, and facilitate popularization of an In-cell touch technology In a display panel, especially a large-sized display panel.

In order to achieve the above purpose, the array substrate, the touch display panel and the display device adopt the following technical solutions.

The application provides an array substrate, array substrate includes:

a first substrate;

a plurality of touch electrodes disposed on the first substrate;

the driving circuit layer is arranged on one side, far away from the first substrate, of the touch electrode, and a plurality of touch thin film transistors are formed in the driving circuit layer;

and each touch unit is formed by connecting the touch electrode with at least one corresponding touch thin film transistor.

Optionally, in some embodiments, the touch units are arranged in an array;

the array substrate further comprises a plurality of touch scanning lines and a plurality of data reading lines, wherein:

the touch scanning lines are connected with the touch thin film transistors of the touch units in the corresponding rows;

the data reading lines are connected with the touch control thin film transistors of the touch control units in the corresponding rows.

Optionally, in some embodiments, a sense amplifier is disposed on the data read line.

Optionally, in some embodiments, the driving circuit layer has formed therein:

the interlayer dielectric layer is arranged on one side of the touch thin film transistor, which is far away from the touch electrode; and the number of the first and second groups,

the common electrode is arranged on one side of the interlayer dielectric layer, which is far away from the touch thin film transistor;

wherein the interlayer dielectric layer is a multilayer laminated structure.

Optionally, in some embodiments, a pixel electrode is further formed in the driving circuit layer, and the pixel electrode is located on a side of the interlayer dielectric layer where the common electrode is located, or on a side of the interlayer dielectric layer away from the common electrode.

Optionally, in some embodiments, the touch electrode is configured as a self-capacitance touch electrode.

Correspondingly, this application still provides a touch-control display panel, touch-control display panel includes the array substrate of this application, and with the array substrate is to the opposition base plate that the box set up.

Optionally, in some embodiments, the display and the touch of the touch display panel adopt a time-sharing scanning manner.

Correspondingly, the application also provides a touch display device, which comprises the touch display panel and the backlight module.

Optionally, in some embodiments, the backlight module is disposed on a side of the opposite substrate away from the array substrate.

Compared with the prior art, this application array substrate, touch-control display panel and touch-control display device through with touch-control electrode setting on the substrate base plate, can solve signal crosstalk and the shielding of common electrode and/or pixel electrode, solve simultaneously because the crosstalk that parasitic capacitance between touch-control electrode and common electrode and/or the pixel electrode brought, can improve touch-control unit's sensitivity and degree of accuracy. The touch unit In the application adopts an active matrix touch technology, and simultaneously adopts a sampling mode of active matrix row scanning for addressing, so that compared with the existing self-capacitance mode, the number of ICs can be greatly reduced, and the popularization of the In-cell touch technology In display, especially large-size display, is facilitated.

Drawings

The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a first embodiment of an array substrate provided in an embodiment of the present application.

Fig. 2 is a schematic circuit structure diagram of a touch unit of the array substrate in fig. 1.

Fig. 3 is a schematic view of a touch display panel according to a first embodiment of the present disclosure.

Fig. 4 is a schematic view of an array substrate according to a second embodiment of the present disclosure.

Fig. 5 is a schematic view of a touch display panel using the array substrate of fig. 4.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Furthermore, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the invention, are given by way of illustration and explanation only, and are not intended to limit the scope of the invention. In the present application, unless indicated to the contrary, the use of the directional terms "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, and more particularly to the orientation of the figures of the drawings; while "inner" and "outer" are with respect to the outline of the device.

The present application provides an array substrate 10 and a touch display panel 100 formed by the array substrate 10. As shown in fig. 1 and 2, an array substrate 10 of the present application includes a first substrate 11, a driving circuit layer 12 disposed on the first substrate 11, and a plurality of touch units 13. The touch unit 13 includes a touch electrode 131 and a touch thin film transistor 132 electrically connected to an input terminal of the touch electrode 131, and the touch thin film transistor 132 is formed in the driving circuit layer 12, and the touch electrode 131 is located between the first substrate 11 and the driving circuit layer 12.

Obviously, according to the array substrate 10 and the display panel of the present application, by disposing the touch electrode 131 on the first substrate 11, the signal crosstalk and shielding effect caused by the pixel electrode 122 and/or the common electrode 123 can be effectively solved, and meanwhile, the crosstalk problem caused by the parasitic capacitance between the touch electrode 131 and the pixel electrode 122 and/or the common electrode 123 can be reduced, so that the accuracy and the sensitivity of the touch unit 13 can be improved.

Moreover, the touch unit 13 of the present application is an active matrix touch unit 13, which can implement sampling addressing of active matrix line scanning, can greatly reduce the number of ICs, and is beneficial to popularization of recommending In-cell touch technology In display, especially large-size display.

Referring to fig. 1 and fig. 3, the touch display panel 100 of the present embodiment includes an array substrate 10 of the present application and an opposite substrate 20 disposed opposite to the array substrate 10.

Specifically, the touch display panel 100 is a liquid crystal touch display panel 100. At this time, the display mode of the touch display panel 100 may be an IPS (In Plane Switching) mode.

Referring to fig. 1 and 3, the array substrate 10 includes a first substrate 11, a driving circuit layer 12, and a touch unit 13, wherein the touch unit 13 includes a touch electrode 131 and a touch thin film transistor 132.

Wherein the first substrate 11 is a transparent substrate, a generally transparent rigid glass substrate, or a transparent flexible substrate. For example, the first substrate 11 is made of a polymer material having light transmittance and flexibility, and the polymer material includes polyimide, polysiloxane, epoxy resin, acrylic resin, polyester, and/or the like. In this embodiment, the material of the first substrate 11 is a glass substrate.

Referring to fig. 1, the touch electrode 131 is directly disposed on the first substrate 11. The touch electrode 131 is used for sensing a capacitance change of a finger during a touch operation. Specifically, when a finger touches a certain position of the touch display panel 100 or the screen, the capacitance value of the touch electrode 131 at the position changes, and the output potential signal changes.

In the embodiment of the present application, by disposing the touch electrode 131 on the first substrate 11, the touch electrode 131 can be separated from the pixel electrode 122 and/or the common electrode 123, so as to reduce the crosstalk problem caused by parasitic capacitance.

Furthermore, in some embodiments in which the array substrate 10 is used as a light-emitting side (or a display side), that is, the backlight module is disposed on a side of the opposite substrate 20 away from the array substrate 10, a distance between the touch electrode 131 and a finger can be reduced, and the sensing sensitivity of the touch electrode 131 can be improved. At this time, even a very slight touch may be sensed by the touch electrode 131.

Specifically, the touch electrode 131 is configured as a self-contained touch sensing electrode.

Specifically, the touch electrode 131 is a transparent conductive film. The material of the touch electrode 131 includes Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), Aluminum Tin Oxide (ATO), Aluminum Zinc Oxide (AZO), Indium Gallium Zinc Oxide (IGZO), or a metal or alloy with a thickness less than 60 angstroms.

Referring to fig. 1 to 3, the driving circuit layer 12 is disposed on a side of the touch electrode 131 away from the first substrate 11, and a plurality of touch thin film transistors 132 for forming a touch unit 13 are formed in the driving circuit layer 12. That is, the touch thin film transistor 132 of the touch unit 13 is disposed in the driving circuit layer 12.

The input end of the touch thin film transistor 132 is connected to the touch electrode 131, and is configured to control on/off of a touch output signal of the touch unit 13. In this embodiment, the source of the touch tft 132 is connected to the corresponding touch electrode 131.

Specifically, each of the touch units 13 includes a touch electrode 131 and at least one touch thin film transistor 132. Preferably, the touch unit 13 includes two touch thin film transistors 132. In other embodiments, the number of the touch tfts 132 may be 5 or 3. That is, the number of the touch tfts 132 in the touch unit 13 is not limited in this application.

Referring to fig. 1 to fig. 3, the driving circuit layer 12 includes a plurality of touch scan lines 126 disposed at intervals in a transverse direction and a plurality of data readout lines 127 disposed at intervals in a longitudinal direction.

Referring to fig. 2, the touch scan line 126 is connected to the touch thin film transistor 132 of each touch unit 13 in the corresponding row. Specifically, the touch scan lines 126 are connected to the control ends of the touch tfts 132 of each touch unit 13 in the corresponding row, n touch scan lines 126 are connected to the control ends of the touch tfts 132 of the touch units 13 in the corresponding n rows, and one touch scan line 126 is used to control the touch units 13 in the n columns of the row where the touch scan line is located, so as to implement row scanning for touch detection.

Referring to fig. 2, the data read line 127 is connected to the touch thin film transistor 132 of each touch unit 13 in a corresponding row. Specifically, the data reading line 127 is connected to the output end of the touch thin film transistor 132 of each touch unit 13 in the corresponding row, n data reading lines 127 are connected to the output ends of the touch thin film transistors 132 of n corresponding rows of the touch units 13, one data reading line 127 is used for reading the touch signals of n rows of the touch units 13 in the row, so that row scanning of touch detection is realized, the number of reading traces of the touch signals only needs n, sensing accuracy is high, traces are simple and easy to integrate, and a reading mode is easy to realize.

With such a configuration, the touch unit 13 of the present application can adopt a line scanning manner, and scan the touch scanning lines 126 line by line in a horizontal direction, wherein each line of the touch scanning lines 126 is opened once; in the longitudinal direction, the touch unit 13 is read out once per column through the data read line 127 to determine the coordinates in the longitudinal direction, so that the coordinate positions in the X and Y directions can be determined, and multi-touch is supported.

Referring to fig. 2, specifically, the touch scan lines 126 may be laterally spaced and parallel to each other, and are used for outputting scan control signals of the touch unit 13, and the number of the touch scan lines 126 may be n. The data reading lines 127 may be longitudinally spaced and parallel to each other, and are used for reading the touch output signal of the touch unit 13, and the number of the data reading lines 127 may be n; the plurality of touch scan lines 126 and the plurality of data read lines 127 form a grid distribution.

Specifically, the input end of the touch scan line 126 is connected to a gate driver (IC)41, and the output end of the data read line 127 is connected to a touch driver (IC) 42. When the touch unit 13 is scanned, the gate driver 41 provides a scanning signal to the touch scanning line 126, and the data reading line 127 transmits the read touch electrical signal to the touch driver 42.

Specifically, in order to better detect the touch operation, the touch unit 13 further includes a sense amplifier disposed on the data reading line 127 to amplify the electrical signal sensed by the touch unit 13, so as to accurately locate the coordinate position of the signal (touch) stimulation point. In particular implementations, the sense amplifier may be an integrator.

In the present application, the touch unit 13 adopts an active matrix touch (AM-touch) technology, integrates In-cell mode In the inner substrate, and adopts active matrix scanning sampling mode addressing, which can realize multi-touch compared with the current self-capacitance touch mode, and can also greatly reduce the number of ICs, thereby facilitating the promotion and popularization of the In-cell touch technology In display, especially In large-size display.

Furthermore, in the scheme of this application, this touch-control unit 13 arranges, can hardly cause array substrate 10 and touch-control display panel 100's thickness and weight to increase, can also reduce the frame region, compares in outer hanging touch-control display panel 100, has further saved toughened protective glass again and has laminated the processing procedure, has saved the cost greatly. Compared with the traditional embedded touch display panel, the embedded touch display panel breaks through the limitation that the embedded touch electrodes 131 only adopt a common electrode multiplexing mode, and solves the process difficulty that a huge touch circuit is connected across different substrates; compared with the mutual capacitance touch display panel 100, the touch unit 13 has higher sensitivity and is more suitable for large-size commercial products.

Specifically, the driving circuit layer 12 further includes a plurality of pixel driving circuits. The pixel driving circuit includes a display thin film transistor 121, a pixel electrode 122, a common electrode 123, a driving data line, and a driving scan line. The source of the display thin film transistor 121 is connected to the driving data line, and the gate of the display thin film transistor is connected to the driving scan line.

Adjacent driving data lines and adjacent driving scan lines of the array substrate 10 are crossed with each other to form a pixel region. Accordingly, the distribution of the touch units 13 may be that one touch unit 13 is correspondingly disposed in one pixel region.

In order to reduce the manufacturing cost and simplify the circuit structure, preferably, the distribution of the touch units 13 may also be: one touch unit 13 is disposed in a plurality of pixel regions. Specifically, the number of pixel regions corresponding to one pixel display unit may be determined according to the actual touch sensing area, the aperture ratio of the pixels, and the like. For example, if the actual touch sensing area is larger, one touch unit 13 may be correspondingly disposed in more pixel areas, otherwise, one touch unit 13 may be correspondingly disposed in less pixel areas. If the aperture ratio of the pixel is higher, one touch unit 13 may be correspondingly disposed in more pixel areas, otherwise, one touch unit 13 may be correspondingly disposed in less pixel areas.

As shown in fig. 1 and 3, in order to be insulated and separated from the touch electrode 131, the driving circuit layer 12 includes an insulating layer 124, and the insulating layer 124 is disposed between the touch thin film transistor 132 and the touch electrode 131. The insulating layer 124 may have a single-layer film structure or a multi-layer laminated film structure.

As shown in fig. 1 and fig. 3, the driving circuit layer 12 further includes an interlayer dielectric layer 125, and the interlayer dielectric layer 125 is disposed on the sides of the touch thin film transistor 132 and the display thin film transistor far from the insulating layer 124.

In specific implementation, the interlayer dielectric layer 125 may be a multilayer stacked structure, so as to further reduce the crosstalk problem caused by the parasitic capacitance between the touch electrode 131 and the pixel electrode 122 and/or the common electrode 123.

Specifically, the interlayer dielectric layer 125 includes an inorganic dielectric layer and an organic dielectric layer, which are sequentially overlapped in a thickness direction thereof, and by overlapping the organic and inorganic layers, the adhesion between the layers is enhanced, and at the same time, the problems of poor bending property and flexibility due to the increase of the film layer are alleviated. In a preferred embodiment, the interlayer dielectric layer 125 is a sandwich structure of PV/PFA/PV. In particular, the organic material may be polyimide, epoxy resin, acrylic resin, polyester and/or the like.

As shown in fig. 1 and 3, the common electrode 123 is disposed on a side of the interlayer dielectric layer 125 away from the touch thin film transistor 132.

Specifically, the common electrode 123 may be implemented in the form of a plate electrode, a slit electrode, or a finger electrode. It should be noted that the present application does not limit the arrangement form of the common electrode 123.

Specifically, the common electrode 123 is a transparent electrode. The transparent electrode material of the common electrode 123 may be Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), Aluminum Tin Oxide (ATO), Aluminum Zinc Oxide (AZO), Indium Gallium Zinc Oxide (IGZO), or a metal or alloy with a thickness less than 60 angstroms.

As shown in fig. 1 and fig. 3, the pixel electrode 122 is disposed on a side of the interlayer dielectric layer 125 away from the touch thin film transistor 132, and the pixel electrode 122 is connected to the drain of the display thin film transistor 121 through a via hole.

Specifically, the pixel electrode 122 may be implemented in the form of a plate electrode, a slit electrode, or a finger electrode.

Specifically, the pixel electrode 122 is a transparent electrode. The transparent electrode material of the pixel electrode 122 may be Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), Aluminum Tin Oxide (ATO), Aluminum Zinc Oxide (AZO), Indium Gallium Zinc Oxide (IGZO), or a metal or alloy with a thickness less than 60 angstroms.

Referring to fig. 3, the counter substrate 20 and the array substrate 10 are disposed in a cassette. The counter substrate 20 includes a second substrate 21, a black matrix 22, a color resist layer 23, and a conductive electrode 24, wherein the color resist layer 23 includes a plurality of color resist blocks arranged at intervals.

The color resistance block is used for converting light incident light into emergent light with various colors so as to visually display colors corresponding to the color resistance, and further display required pictures. Preferably, the color block includes at least one of a red color block, a blue color block, or a green color block. The conductive electrode 24 is configured as a common electrode 123 disposed on the color filter substrate.

The color resistance layer 23 is disposed on the second substrate 21, the black matrix 22 is disposed on the second substrate 21 and between two adjacent color resistance blocks, and the planarization layer is disposed on a side of the color resistance layer 23 away from the second substrate 21 and covers the black matrix 22 and the color resistance blocks. The conductive electrode 24 is disposed on the black matrix 22 on a side away from the second substrate 21.

Specifically, the touch liquid crystal display panel includes a liquid crystal layer 30 between an array substrate 10 and a counter substrate 20.

The specific structures of the touch display panel 100 and the array substrate 10 of the present application are described above. In specific implementation, in order to implement the display and touch functions, the display and touch of the touch display panel 100 adopt a time-sharing scanning manner, that is, after each frame of display is scanned, the touch unit 13 scans, so that the problem of signal crosstalk between display and touch can be effectively solved.

Please refer to fig. 4 and fig. 5 together, wherein fig. 4 is a schematic diagram of a second embodiment of the array substrate 10 according to the present application, and fig. 5 is a schematic diagram of a touch display panel 100 using the array substrate 10 of fig. 4.

The main difference of this embodiment compared with fig. 1 to 3 is the arrangement of the pixel electrodes 122 in the array substrate 10. Referring to fig. 4 and 5, in the present embodiment, the pixel electrode 122 is disposed on a side of the interlayer dielectric layer 125 far from the common electrode 123. The pixel electrode 122 is in the same layer as the source and drain electrodes of the thin film transistor, and the pixel electrode 122 overlaps the source electrode of the driving thin film transistor.

In this embodiment, the display mode of the touch display panel 100 is FFS.

In other embodiments, the array substrate 10 may also be a COA type array substrate 10, that is, the color resist layer 23 or the color film layer is disposed on the array substrate 10. Accordingly, in the touch display panel 100, the opposite substrate 20 may omit the color resist layer 23.

The present application further provides a touch display device, which includes the touch display panel 100 and the backlight module of the present application.

Specifically, the backlight module is disposed on a side of the opposite substrate 20 away from the array substrate 10. In this embodiment, the backlight module is disposed on the opposite substrate 20 far from the array substrate 10, so as to reduce the distance between the touch electrode 131 and the finger and improve the sensing sensitivity of the touch electrode 131. At this time, even a very slight touch may be sensed by the touch electrode 131.

The array substrate, the touch display panel and the display device provided in the embodiments of the present application are described in detail above, and specific examples are applied herein to explain the principles and embodiments of the present application, and the description of the embodiments above is only used to help understand the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. An array substrate, comprising:

a first substrate;

a plurality of touch electrodes disposed on the first substrate;

2. The array substrate of claim 1, wherein the plurality of touch units are arranged in an array;

3. The array substrate of claim 2, wherein a sense amplifier is disposed on the data read line.

4. The array substrate of claim 1, wherein the driving circuit layer has formed therein:

wherein the interlayer dielectric layer is a multilayer laminated structure.

5. The array substrate of claim 4, wherein a pixel electrode is further formed in the driving circuit layer, and the pixel electrode is located on one side of the interlayer dielectric layer where the common electrode is located or on one side of the interlayer dielectric layer away from the common electrode.

6. The array substrate of claim 1, wherein the touch electrode is configured as a self-capacitance touch electrode.

7. A touch display panel comprising the array substrate according to any one of claims 1 to 6, and an opposite substrate provided opposite to the array substrate.

8. The touch display panel according to claim 7, wherein the touch display panel adopts a time-division driving scanning method for display and touch control.

9. A touch display device, comprising the touch display panel of claim 7 or 8 and a backlight module.

10. The touch display device of claim 9, wherein the backlight module is disposed on a side of the opposite substrate away from the array substrate.