CN107422910B

CN107422910B - Touch display device

Info

Publication number: CN107422910B
Application number: CN201710552915.7A
Authority: CN
Inventors: 邱峰青; 刘永锋; 陈敏
Original assignee: InfoVision Optoelectronics Kunshan Co Ltd
Current assignee: InfoVision Optoelectronics Kunshan Co Ltd
Priority date: 2017-07-07
Filing date: 2017-07-07
Publication date: 2020-08-04
Anticipated expiration: 2037-07-07
Also published as: CN107422910A

Abstract

The invention relates to the technical field of touch control, in particular to a touch display device, which comprises: a color filter substrate; the array substrate is arranged opposite to the color filter substrate; the liquid crystal layer is arranged between the color filter substrate and the array substrate; and a touch layer including a plurality of electrode groups for detecting a touch, the plurality of electrode groups being disposed on the color filter substrate or the array substrate, each electrode group including a plurality of electrodes, each electrode of the plurality of electrode groups including a mesh structure and an electrode lead connected to the mesh structure, wherein in each electrode group, a size of the electrode is gradually decreased in at least one direction, thereby providing a space in which the electrode lead extends. The design can effectively reduce the dead zone area and change the dead zone shape, thereby improving the user experience.

Description

Touch display device

Technical Field

The invention relates to the technical field of touch control, in particular to a touch display device.

Background

Liquid crystal display devices have been widely used in mobile terminals such as mobile phones and large-sized display panels such as flat panel televisions. The liquid crystal display device includes an array substrate, a color filter substrate, and a liquid crystal layer interposed therebetween. A pixel electrode and a common electrode are formed on the substrate, and rotation of liquid crystal molecules of the liquid crystal layer is controlled by applying a driving voltage therebetween, thereby changing light transmittance.

The touch panel is embedded in the liquid crystal display device, and a touch display panel can be further formed. The touch display panel can provide not only a display function but also a user interaction function. The integration of the two can reduce the overall cost of the electronic product. According to the difference of the integration technology of integrating the touch panel in the lcd device, the touch panel can be classified into an ogs (one glass solution) panel, an on Cell panel, and an in Cell panel. The On Cell panel and the in Cell panel respectively comprise induction electrodes formed above and below the upper glass substrate, and a touch induction circuit is adopted to detect capacitance changes of the induction electrodes, so that touch actions and touch positions of users are detected. In comparison, the on Cell panel and the in Cell panel can reduce the thickness and improve the display effect, thereby being beneficial to the lighter and thinner touch display panel.

The touch precision and the light and thin requirements of the touch display panel provide higher requirements for the design of the touch display panel. Particularly, in the in Cell panel, since the touch panel is embedded in the color filter substrate or the array substrate, the sensing electrode and/or the driving electrode on the touch panel are overlapped with the pixel electrode, the source data line and the gate scan line on the array substrate, and a parasitic capacitance is formed at the overlapped portion. When the parasitic capacitance is large, interference may be caused to the detection signal, which is not favorable for determining the touch position. In addition, because the ITO electrode has high impedance, touch signals are attenuated, the touch sensitivity is influenced, and different color differences and different penetration rates exist due to different thicknesses of the ITO, so that the display is influenced.

Therefore, the touch display panel needs to be further optimized.

Disclosure of Invention

The invention provides a touch display device, wherein each electrode is made of grid metal, the electrode size of each group of electrodes is gradually reduced on the first aspect, and an electrode lead-out wire is arranged in a space reserved on one side of each electrode.

The invention provides a touch display device, comprising:

a color filter substrate;

the array substrate is arranged opposite to the color filter substrate;

the liquid crystal layer is arranged between the color filter substrate and the array substrate;

the touch layer comprises a plurality of electrode groups for detecting touch, and is arranged on the color filter substrate or the array substrate, each electrode group comprises a plurality of electrodes, and each electrode in the electrode groups comprises a grid structure and an electrode lead connected with the grid structure;

wherein in each electrode group the electrode size decreases stepwise in at least one direction.

Preferably, each electrode is formed by a grid of the same size, and in each electrode group, the number of grids included in the electrode is gradually decreased in at least one direction.

Preferably, the color filter substrate further includes a black matrix and a filter layer located at an opening of the black matrix, wherein, in a light transmission direction of the touch display device, a projection of each electrode in the plurality of electrode groups falls within a projection of the black matrix.

Preferably, each electrode of the plurality of electrode groups is provided with an electrode lead, the projections of which fall within the projection of the black matrix.

Preferably, the electrode leads in each of the electrode sets are disposed on the same side of the electrode set.

Preferably, the electrode leads in adjacent electrode groups are arranged in opposite or same orientation.

Preferably, the electrode leads are in a mesh structure.

Preferably, the grid structure is a metal grid, and the metal grid is square, rectangular or rhombic.

Preferably, the line width of the grid structure is 2-5 um.

Preferably, the electrode group constitutes a touch layer of a self-capacitance.

According to the touch display device provided by the invention, the size of the electrode is gradually reduced in at least one upper direction, so that a space for extending the electrode lead is provided. The size of the electrode is gradually reduced, the area occupied by the electrode lead is in a step shape, and the area occupied by the electrode lead is a dead zone of the touch device. The design can effectively reduce the dead zone area and change the dead zone shape, thereby improving the user experience.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.

Fig. 1a is a schematic cross-sectional view of a conventional touch display device.

Fig. 1b is a three-dimensional structure diagram of the touch display device according to the first embodiment of the invention.

Fig. 2a-2b are top views of the black matrix 103 and the touch layer 102 in fig. 1, and fig. 2c is a superimposed effect diagram of fig. 2a and 2 b.

FIG. 3 is a top view of an alternative design of the touch layer 102 of FIG. 1.

Fig. 4 is a perspective view of a touch display device according to a second embodiment of the invention.

Fig. 5 is a schematic diagram of an electrode cut through a mesh of metal according to an embodiment of the present invention.

Fig. 6 is another schematic diagram of a metal cutting electrode through a mesh in accordance with an embodiment of the present invention.

Fig. 7 is a graph of transmittance and voltage of a touch display device according to an embodiment of the present invention.

Detailed Description

The invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by like reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale. In addition, wirings other than corresponding driving electrodes and sensing electrodes are not drawn in the drawings, and some well-known portions may not be shown.

In the following description, numerous specific details of the invention, such as structure, materials, dimensions, processing techniques and techniques of the devices are described in order to provide a more thorough understanding of the invention. However, as will be understood by those skilled in the art, the present invention may be practiced without these specific details.

The present invention will be described in detail below with reference to the accompanying drawings.

The touch display device includes an array substrate 10a and a color filter substrate 11a, and a liquid crystal layer 106a disposed between the array substrate 10a and the color filter substrate 11 a. The array substrate 10a includes a lower substrate 101a, a pixel electrode 104a disposed on the lower substrate 101a, and a common electrode 105a disposed on the pixel electrode, and an interlayer dielectric layer 102a is disposed between the pixel electrode 104 and the common electrode 105a for insulation. An alignment film 103a is provided on the common electrode 105 a. The touch display device further includes a touch layer formed by touch electrodes 109a, which is shown on the interlayer dielectric layer 102a and is on the same layer as the common electrode 105 a. Of course, the position of the touch layer is not limited to this, and the touch layer is also located on the interlayer dielectric layer at another position, or on the color filter substrate 11 a.

The color filter substrate 11a and the array substrate 10a are disposed opposite to each other, and include an upper substrate 114a, and a black matrix 117a and a color filter layer 113a are disposed on a lower surface of the upper substrate 114 a. Color resist materials are deposited on the vertical and horizontal grids of the black matrix 117a to form red, green, blue (RGB) sub-pixels, constituting the color filter layer 113 a. The material of the black matrix 117a is a commonly used black matrix material chromium. The shape of the black matrix may be changed in any way. A common electrode 112a and an alignment film 111a are provided on the lower surfaces of the black matrix 117a and the color filter layer 113 a. The common electrode 112a and the common electrode 105a are combined into one common electrode, which may be located above the upper substrate or below the lower substrate. The common electrode and the pixel electrode form a pixel capacitance.

Those skilled in the art will appreciate that fig. 1a only shows some components of the touch display device, and in an actual product, the positions of the components may be different from those shown in the figure.

Fig. 1b is a perspective view of the touch display device according to the first embodiment of the invention, and only relevant components are shown in this embodiment for convenience. As shown in fig. 1b, the touch display device 100 includes: an upper substrate 106, a lower substrate 101, and a liquid crystal layer (not shown in the figure) disposed between the substrates. On the lower surface of the upper substrate 106, a filter layer 104 and a black matrix 103 are provided. The upper substrate 106, the filter layer 104, and the black matrix 103 constitute a color filter substrate. The filter layer 104 and the black matrix 103 are configured the same as the aforementioned black matrix 117a and the color filter layer 113 a.

The lower substrate 101 is provided with a pixel electrode, a common electrode, and the like to form an array substrate. The lower substrate 101 is further provided with a touch layer 102 for detecting touch sensing, and in this embodiment, the touch layer is a self-capacitance touch layer. The touch layer may be disposed on an interlayer dielectric layer (e.g., the interlayer dielectric layer 102a of fig. 1 a) of the touch display device such that the touch layer is embedded in the array substrate. The touch-sensitive touch layer 102 may also be located on a color filter substrate, such as on a black matrix of the color filter substrate or on the upper substrate 106.

In an alternative embodiment, the electrode of the touch layer 102 may be shared with a common electrode, for example, the common electrode 105a of the touch display device shown in fig. 1a is used as the electrode of the touch layer. I.e. one electrode is used as a common electrode in a display device and as a sensing electrode in a touch device. Touch and display adopt a time-sharing scanning mode to complete a touch display function.

Fig. 2b is a top view of the touch layer 102 in fig. 1 b. As shown in the figure, the touch layer 102 includes four electrode groups, each electrode group is composed of three electrodes, each electrode is composed of a grid structure, specifically a metal grid, and an electrode lead is disposed on each electrode. The electrode groups and the number of electrodes per electrode group are taken as examples and are not limited thereto. In general, in the electrode group as shown in the figure, each electrode size is the same, but in the present embodiment, in each electrode group, the electrode size is gradually reduced in both the X-axis and Y-axis directions, thereby leaving enough space for disposing the electrode leads on the substrate. Of course, in alternative embodiments, the taper may be in one direction, such as the X-axis direction or the Y-axis direction.

In the embodiment, the electrode size is gradually reduced, so that the area occupied by the electrode lead is in a step shape, the area occupied by the electrode lead is the dead zone of the touch display device, the dead zone area can be effectively reduced through the design, the shape of the dead zone is changed, and the user experience is improved. Those skilled in the art will appreciate that the touch layer shown in the figures is only for illustration, and in an actual product, the number of electrode groups and the number of electrodes included in each electrode group may be selected according to specific situations.

Fig. 2a is a plan view of the black matrix 103 in fig. 2. The black matrix 103 is formed of a vertical and horizontal grid. In this embodiment, the grid line width of the black matrix 103 should be greater than or equal to the grid line width of the corresponding portion of the touch layer, so that the projection of the metal grid electrode falls into the projection of the black matrix, that is, the black matrix shields the electrode in the light shielding direction, so that the electrode group does not have a display area. And, a part or all of the projection of each electrode lead falls within the projection of the black matrix, so that the electrode lead does not appear in the display area. Fig. 2c is an effect diagram of the black matrix in fig. 2a and the touch layer in fig. 2b after being overlapped. As can be seen from the figure, the black matrix completely covers the grid metal lines and almost all of the electrode leads.

As can be seen from fig. 2b, the metal mesh forming each electrode in the drawing is square, and in practical design, it may also be rectangular, diamond, circular or other shapes, and the line width of the metal mesh is generally 2-5 um. In fig. 2b, the four electrode groups are provided with electrode leads on the same side of the electrode group, with the electrode leads and the electrode group being in the same plane. FIG. 3 is a top view of an alternative design of the touch layer 102 of FIG. 1. Unlike fig. 2b, the electrode leads of the

electrode groups

301 and 302 are oriented oppositely, with the electrode leads disposed on opposite sides of the electrode groups, and the electrode leads of the

electrode groups

303 and 304 are oriented oppositely, with the electrode leads disposed on opposite sides of the electrode groups.

It will be understood by those skilled in the art that the touch layer in the above embodiments may also be a mutual capacitance touch layer, and thus includes a plurality of mutually intersecting and insulated sensing electrode sets and driving electrode sets. The size of the electrode of the induction electrode group in the direction of the induction electrode wire is gradually reduced, and the size of the electrode of the driving electrode group in the direction of the driving electrode wire is gradually reduced, so that a space is reserved on the plane of the grid metal layer for arranging an electrode lead of the induction electrode group, and a space is reserved on the plane of the grid metal layer for arranging an electrode lead of the driving electrode group. And the projection of the induction electrode and the drive electrode falls in the projection of the black matrix, so that the induction electrode and the drive electrode are shielded by the black matrix in the shading direction, and a display area does not appear on the induction electrode and the drive electrode. Further, a part or all of the projection of each electrode lead also falls within the projection of the black matrix.

Fig. 4 is a perspective view of a touch display device according to a second embodiment of the invention. As shown in fig. 1, the touch display device 400 includes: an upper substrate 405, a lower substrate 401, and a liquid crystal layer (not shown in the drawing) disposed between the substrates. The lower substrate 401 is provided with source data lines, gate scan lines, thin film transistors, common electrodes, and the like, which constitute an array substrate of the touch display device. The upper substrate 405 is provided with a black matrix 402, a filter layer 403, and a touch layer 404. As can be seen from comparing fig. 4 and fig. 1, the difference between the two is that the touch layer in fig. 4 is located on the black matrix. This is because the backlight module of the touch display device is disposed under the lower substrate 401, so that light rays are upward from the bottom, when the black matrix is above, due to the shielding of the black matrix, the display area has no projection of the electrode lines of the touch layer, when the black matrix is below, due to the shielding of the black matrix, the light rays cannot strike the electrode lines of the touch layer, and therefore, there is no projection of the electrode lines of the touch layer in the display area. Further, the touch layer may also be located above the upper substrate 405 to form a touch display device with an on Cell structure.

Fig. 5 is a schematic diagram of an electrode cut through a mesh of metal according to an embodiment of the present invention. 501 is a metal mesh electrode layer, 502 is a cutting line, and the cutting is performed along the line of 502 to generate an electrode 503 and a corresponding electrode lead 504. As can be seen, the electrode 503 may comprise an incomplete grid. Preferably, the electrodes are formed from a complete metal mesh, the metal mesh being of equal size. For this reason, when an electrode group is provided, for example, a 5 × 5 grid electrode, a 4 × 4 grid electrode, a 3 × 3 grid electrode, and a 2 × 2 grid electrode may be sequentially included, that is, the electrode size is gradually reduced by the number of grids. The electrode groups and the number of electrodes per electrode group are not limited thereto.

Fig. 6 is another schematic diagram of a metal cutting electrode through a mesh in accordance with an embodiment of the present invention. 601 is a metal mesh electrode layer, 602 is a cut line, cut along the line of 602, creating electrodes 603 and corresponding electrode leads 604. The difference between fig. 6 and 5 is in the electrode leads. In fig. 5, the electrode lead is a single metal wire, and in fig. 6, the electrode lead has a mesh structure, specifically, a metal mesh structure, and may include 2 metal wires, or 3 or more metal wires. Since the resistance of the electrode leads also affects the touch effect, the reduction of the lead resistance is also facilitated by gridding the electrode leads.

As can be seen from fig. 5 and 6, the electrodes and electrode leads may be produced by grid metal cutting. Meanwhile, after cutting, the grid metal around the electrode and the electrode lead can be used as a pseudo metal layer of the touch layer, so that the touch layer is complete in appearance and plays a role in protecting the touch layer.

Fig. 7 is a graph of transmittance and voltage of a touch display device according to an embodiment of the present invention. The dotted line is a graph of transmittance and voltage of the In Cell touch display device provided according to the present invention, the electrode of which is a metal mesh, and the solid line is a graph of transmittance and voltage of the conventional touch display device, the electrode of which is an ITO electrode. As can be seen from the figure, the light transmittance of the touch sensing device of the embodiment of the invention is better than that of the ITO touch display device when the voltage is small, and the light transmittance is substantially the same when the voltage is large. In addition, experiments prove that the parasitic capacitance and the parasitic resistance in the embodiment of the invention are reduced.

According to the touch display device provided by the invention, the electrode of the touch layer is manufactured through the metal grids, the sensitivity and the accuracy are improved, the electrode wire is designed in a space reserved through the electrode design with the size decreasing, the wire jumping of the electrode wire is avoided, the area of the electrode wire is reduced, and the occupied area of the electrode wire is in a step shape, so that the dead zone area is reduced, and the user experience is improved. The electrode design is suitable for touch display devices of in Cell, on Cell and OGS.

In this specification, "lower" refers to a relative concept in a direction closer to the outside of the wiring lead-out sensing layer in the column direction, and "upper" refers to a relative concept in a direction farther from the outside of the wiring lead-out sensing layer in the column direction.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

While embodiments in accordance with the invention have been described above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A touch display device, comprising:

a color filter substrate;

the array substrate is arranged opposite to the color filter substrate;

the liquid crystal layer is arranged between the color filter substrate and the array substrate; and

a touch layer including a plurality of electrode groups for detecting a touch, the plurality of electrode groups being disposed on the color filter substrate or the array substrate, each electrode group including a plurality of electrodes, each electrode of the plurality of electrode groups including a mesh structure and an electrode lead connected to the mesh structure,

wherein in each electrode group, the size of the electrodes is gradually reduced in at least one direction so as to provide a space for extending the electrode lead, the electrode lead is in a grid structure, and each electrode and the electrode lead thereof are obtained by cutting the metal grid.

2. The touch display device of claim 1, wherein each electrode is formed by grids with the same size, and in each electrode group, the number of grids included in the electrode is gradually decreased in at least one direction.

3. The touch display device of claim 1, wherein the color filter substrate further comprises a black matrix and a filter layer located at an opening of the black matrix, and wherein a projection of each of the plurality of electrode groups falls within a projection of the black matrix in a light transmission direction of the touch display device.

4. The touch display device of claim 3, wherein the projections of the electrode leads all fall within the projection of the black matrix.

5. The touch display device of claim 4, wherein the electrode leads of each electrode group are disposed on the same side of the electrode group.

6. The touch display device of claim 5, wherein the electrode leads of adjacent electrode groups are arranged in opposite or same orientation.

7. The touch display device of claim 1, wherein the metal grid is square, rectangular, or diamond-shaped.

8. The touch display device of claim 1, wherein the grid structure has a line width of 2-5 um.

9. The touch display device of claim 1, wherein the electrode set forms a self-capacitive touch layer.