CN103995616B - Embedded touch panel and display device - Google Patents

Abstract

The present invention relates to an in-cell touch panel and a display device, wherein the in-cell touch panel includes an array substrate, wherein the array substrate includes a common electrode layer, and is arranged on the common electrode layer. And multiple sets of touch driving electrodes insulated from the common electrode layer, the in-cell touch panel further includes touch sensing electrodes, the touch driving electrodes and the touch sensing electrodes are intersected and insulated.

Description

Embedded touch panel and display device

technical field

The invention relates to the field of display technology, in particular to an embedded touch panel and a display device.

Background technique

Touch panels for touch input are widely used in TVs, mobile phones, portable terminals, and other display devices. The overall thickness of the module can also reduce the production cost of the touch panel, which is valued by major manufacturers.

FIG. 1 shows a schematic plan view of touch sensing electrodes and common electrode layers of an existing in-cell touch panel, and FIG. 2 shows a cross-sectional view along line A-A in FIG. 1 . As shown in FIG. 2 , the in-cell touch panel includes an array substrate 10 and a color filter substrate 20 opposite to the array substrate 10, wherein the color filter substrate 20 has a plurality of touch sensing electrodes 21, and the array substrate 10 has a plurality of touch sensing electrodes 21. The common electrode layer 11 is composed of a plurality of touch driving electrodes 12 and a plurality of common electrodes 13 arranged across. As shown in FIG. 1 , each common electrode 13 and touch sensing electrode 21 is a strip electrode extending along the second direction Y, and the touch sensing electrode 21 is located above each common electrode 13; X extends and is composed of a plurality of block-shaped touch driving sub-electrodes electrically connected by touch driving signal lines 14 , such as the touch driving sub-electrodes 12 a , 12 b , 12 c , and 12 d shown in FIG. 1 .

However, in the existing in-cell touch panel, the loads of the touch driving electrodes 12 and the common electrodes 13 are not consistent, so that the images of these two parts are displayed unevenly, seriously affecting the image quality, and the load of the touch driving electrodes 12 is relatively large. , it is not easy to realize the touch function at the remote end of the touch signal.

Contents of the invention

The technical problem to be solved by the present invention is that the loads of the touch drive electrodes and the common electrodes in the in-cell touch panel are not consistent, so that the images of the two parts are displayed unevenly.

For this purpose, the present invention proposes an in-cell touch panel, including an array substrate, wherein the array substrate includes a common electrode layer, and is arranged on the common electrode layer and insulated from the common electrode layer. The in-cell touch panel further includes touch sensing electrodes, and the touch driving electrodes and the touch sensing electrodes are intersected and insulated.

Preferably, each set of touch driving electrodes extends along a first direction, each set of touch sensing electrodes extends along a second direction perpendicular to the first direction, and each set of touch driving electrodes extends along the first direction. The first direction is divided into a plurality of touch driving sub-electrodes with the same size and shape.

Preferably, the touch driving sub-electrodes are disposed between the projections of the adjacent two groups of the touch sensing electrodes on the array substrate.

Preferably, each of the touch driving sub-electrodes has a width of 4 mm to 6 mm.

Preferably, the distance between two adjacent touch driving sub-electrodes is 4 μm to 8 μm.

Preferably, each of the touch driving sub-electrodes is a metal grid pattern.

Preferably, the pattern of the metal grid pattern in the first direction corresponds to the projection position of the data line on the array substrate, and the pattern in the second direction corresponds to the projection position of the grid line on the array substrate. corresponding to the position of the projection on the substrate.

Preferably, the touch driving sub-electrodes in the same row are electrically connected through at least one touch driving signal line.

Preferably, the touch driving signal line is fabricated on the same layer as the touch driving electrode, and the touch driving signal line is insulated from the touch sensing electrode.

Preferably, the in-cell touch panel further includes an electrode protection layer disposed on the touch driving electrodes.

Preferably, the electrode protection layer is made on the same layer as the pixel electrode layer of the array substrate, and is not connected to the pixels.

Preferably, the touch driving electrodes are made of transparent conductive material or metal material.

The present invention also provides a display device, which includes the above-mentioned in-cell touch panel.

By adopting the in-cell touch panel and display device disclosed in the present invention, not only can effectively improve the load of the touch driving electrodes and the common electrodes, thereby improving the image quality, but also can effectively increase the number of touch sensing electrodes and touch driving electrodes. The mutual capacitance between the edges reduces the facing capacitance and improves the touch sensitivity.

Description of drawings

The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the invention in any way. In the accompanying drawings:

FIG. 1 shows a schematic plan view of a touch sensing electrode and a common electrode layer of an existing in-cell touch panel;

Figure 2 shows a sectional view along line A-A in Figure 1;

3 shows a schematic plan view of touch drive electrodes and common electrode layers of a touch panel according to an embodiment of the present invention;

Figure 4 shows a sectional view along the line B-B in Figure 3;

FIG. 5 shows a schematic plan view of an array substrate according to an embodiment of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the following will clearly and completely describe the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. Apparently, the described embodiments are some, not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

FIG. 3 shows a schematic plan view of touch driving electrodes and a common electrode layer of a touch panel according to an embodiment of the present invention, and FIG. 4 shows a cross-sectional view along line B-B in FIG. 3 . As shown in Figure 4, unlike the existing in-cell touch panel structure where the common electrode layer is divided into common electrodes and touch drive electrodes, the in-cell touch panel according to the embodiment of the present invention does not divide the common electrode layer , so as not to change the original function of the common electrode layer. The in-cell touch panel according to the embodiment of the present invention includes an array substrate 10, wherein the array substrate 10 includes a common electrode layer 11 and multiple sets of touch driving electrodes 12 disposed on the common electrode layer 11 and insulated from the common electrode layer 11 , the in-cell touch panel further includes touch sensing electrodes 21 , and the touch driving electrodes 12 and the touch sensing electrodes 21 are intersected and insulated.

More specifically, the in-cell touch panel according to the embodiment of the present invention includes an array substrate 10 and a color filter substrate 20 opposite to the array substrate 10, wherein a liquid crystal layer is interposed between the array substrate 10 and the color filter substrate 20, and The boxes are put together through a box-to-box process to form a touch panel. Multiple sets of touch sensing electrodes 21 are disposed on the color filter substrate 20, a common electrode layer 11 is disposed on the array substrate 10, an insulating layer 15 is disposed on the common electrode layer 11, and multiple sets of touch driving electrodes 12 are disposed on the insulating layer 15. , and the touch driving electrodes 12 are intersected with the touch sensing electrodes 21 . Figure 4 illustrates the present invention for the purpose of illustration only, and does not impose any limitation on the present invention. Those skilled in the art should understand that the touch sensing electrodes are not necessarily arranged on the color filter substrate, but can also be arranged on the array substrate. , as long as it is not in contact with the touch driving electrodes. The intersecting arrangement of the touch driving electrodes 12 and the touch sensing electrodes 21 makes the edge mutual capacitance larger and the facing capacitance smaller, thereby improving the touch sensitivity.

It can be seen more clearly from FIG. 3 that the patterns of the common electrode layer and the touch driving electrodes of the in-cell touch panel according to the embodiment of the present invention, as shown in FIG. 3 , each group of touch driving electrodes 12 along the first Extending in the direction X, the touch driving electrodes 12 are composed of a plurality of touch driving sub-electrodes T _x of the same size and shape connected by the touch driving signal lines 14, or each group of touch driving electrodes 12 is separated along the first direction X There are a plurality of touch driving sub-electrodes T _x with the same size and shape, and each group of touch sensing electrodes 21 extends along a second direction Y perpendicular to the first direction X. Preferably, the first direction X is consistent with the direction of the data lines on the array substrate, and the second direction Y is consistent with the direction of the gate lines on the array substrate.

Preferably, the touch driving electrodes 12 are arranged between the projections of the adjacent two sets of touch sensing electrodes 21 on the array substrate 10, so that the touch driving electrodes 12 and the touch sensing electrodes 21 on the array substrate 10 There is no overlap between projections, which maximizes edge mutual capacitance and further improves touch sensitivity. Each touch driving sub-electrode T _x has the same size and shape, the width of each touch driving sub-electrode T _x is about 4 mm to 6 mm, and the distance between two adjacent touch driving sub electrodes T _x is 4 μm to 8 μm. And the projection of the touch sensing electrodes 21 on the array substrate 10 is located between two adjacent columns of touch driving electrodes 12 .

Preferably, an electrode protection layer 16 is further disposed on the touch driving electrode 12 , and the electrode protection layer 16 can be made on the same layer as the pixel electrode layer, and is not connected to the pixel. Since the pixel electrode layer is usually formed of materials such as ITO and IGZO, an electrode protection layer 16 is provided on the touch drive electrode 12 to prevent the touch drive electrode 12 from being oxidized, so that the process stability is better, and to a certain extent, the up the resistance. Those skilled in the art can understand that, while forming the pixel electrode layer, the pixel electrode layer can also be formed as a protective layer on other electrode layers or pads, for example, a pixel electrode layer can be formed as a protective layer on the pads in the edge region, Therefore, the resistance of the electrode or the pad can be reduced while preventing the electrode or the pad from being oxidized.

In FIG. 3 , the touch driving sub-electrodes T _x in the same row are electrically connected through at least one touch driving signal line 14 , and the touch driving signal line 14 extends in a second direction Y perpendicular to the first direction X. Preferably, the touch drive signal line 14 is prepared on the same layer 12 as the touch drive electrode, and the touch drive signal line 14 is connected to the adjacent touch drive sub-electrode T _x , and the touch drive signal line is connected to the touch control electrode. The sensing electrode is insulated, that is, a via hole is set at a position corresponding to the touch sensing electrode, and the adjacent touch sensing electrode is connected to the metal layer corresponding to the lower layer of the touch sensing electrode and the touch driving signal line through the via hole. The sub-electrodes are driven, which not only reduces process steps, but also helps to make the frame of the touch panel narrower. Those skilled in the art should understand that the touch drive signal line is not limited to one, and the touch drive sub-electrodes in the same row may be electrically connected through multiple touch drive signal lines, wherein the touch drive electrodes are , can access the common electrode signal.

The touch driving electrodes 12 can be made of transparent conductive materials such as ITO, preferably in the same layer as the pixel electrode layer. However, in order to improve the conductivity and reduce the load of the touch driving electrodes, so that the screens of the touch driving electrodes and the common electrodes are unified, the touch driving electrodes 12 are preferably made of metal materials. In the case that the touch driving electrodes 12 are made of metal materials, in order not to affect the light transmittance of the display panel, the pattern of the touch driving sub-electrodes Tx adopts a grid shape, that _is , a network formed by wires arranged horizontally and vertically. Grid structure, preferably, the shape and size of each grid are equal, as shown in Figure 3.

The metal grid pattern of each touch driving sub-electrode _Tx will be specifically described below. 5 shows a schematic plan view of the array substrate. In order not to affect the light transmittance of the display panel, for each touch driving sub-electrode Tx, the conductive pattern in the first direction _X can be connected with the data line in the The position of the projection on the array substrate corresponds, and the conductor pattern in the second direction Y corresponds to the position of the projection of the grid line on the array substrate, so that the light transmittance of the display panel will not be affected, so that it can Forming a metal grid pattern on the array substrate, as shown by the thick solid line in FIG. The control driving sub-electrode Tx is short-circuited with the pixel electrode.

The present invention further provides a display device, which includes the above-mentioned built-in touch panel. functional product or component.

By adopting the in-cell touch panel and the display device according to the embodiments of the present invention, not only can effectively improve the load of the touch driving electrodes and the common electrodes, thereby improving the image quality, but also can effectively increase the touch sensing electrodes and the touch driving electrodes. The edge mutual capacitance between electrodes reduces the facing capacitance and improves touch sensitivity.

Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations all fall into the scope of the appended claims. within the limited range.

Claims (9)

1. a kind of embedded touch control panel, including array base palte,

Wherein, on the array base palte include common electrode layer and be arranged in the common electrode layer and with the common electrical Multigroup touch-control drive electrode of pole layer insulation,

The embedded touch control panel also includes touch-control sensing electrode, and the touch-control drive electrode is handed over the touch-control sensing electrode Fork insulation set；

Touch-control drive electrode is extended in a first direction described in each group, and touch-control sensing electrode described in each group is along vertical with the first direction Straight second direction extends, and per group of touch-control drive electrode to be separated into multiple size shapes along the first direction identical Touch-control drive sub-electrode；

Each described touch-control drives sub-electrode to be set to metal grill pattern, and each touch-control drives the wire netting trrellis diagram of sub-electrode The multiple pixel regions of case correspondence, each grid in the metal grill pattern is corresponded with the plurality of pixel region, and Each grid surrounds corresponding pixel region；

The embedded touch control panel also includes the electrode protecting layer being arranged on the touch-control drive electrode；The electrode protection Layer makes with the pixel electrode layer of the array base palte with layer, and is not connected to pixel.

2. embedded touch control panel according to claim 1, wherein the touch-control drives sub-electrode to be arranged on what is be adjacent Described in two groups between projection of the touch-control sensing electrode on the array base palte.

3. embedded touch control panel according to claim 2, wherein each described touch-control drive the width of sub-electrode be 4mm extremely 6mm。

4. embedded touch control panel according to claim 3, wherein between the two neighboring touch-control is driven between sub-electrode Away from for 4 μm to 8 μm.

5. embedded touch control panel according to claim 1, wherein the metal grill pattern is in said first direction Location of projection of the figure with data wire on the array base palte is corresponding, and figure in this second direction exists with grid line Location of projection on the array base palte is corresponding.

6. embedded touch control panel according to claim 1, wherein driving sub-electrode to pass through at least with touch-control described in a line Root touch-control drive signal line is electrically connected.

7. embedded touch control panel according to claim 6, wherein the touch-control drive signal line drives with the touch-control Moving electrode makes with layer, and the touch-control drive signal line is arranged with the touch-control sensing electrode insulation.

8. the embedded touch control panel according to any one of claim 1 to 7, wherein the touch-control drive electrode is using transparent Conductive material or metal material make.

9. a kind of display device, it includes embedded touch control panel according to any one of claim 1 to 8.