CN111522171B

CN111522171B - Display device

Info

Publication number: CN111522171B
Application number: CN202010624959.8A
Authority: CN
Inventors: 郑宏哲; 周文杰; 翟邦和
Original assignee: AU Optronics Kunshan Co Ltd
Current assignee: AU Optronics Kunshan Co Ltd
Priority date: 2020-07-02
Filing date: 2020-07-02
Publication date: 2020-10-09
Anticipated expiration: 2040-07-02
Also published as: CN111522171A; TWI747466B; TW202202913A

Abstract

The invention provides a display device, which comprises a first substrate, a second substrate and a third substrate, wherein the first substrate is provided with a peripheral area and a display area which are arranged adjacently, and the display area is provided with a plurality of pixel units or a plurality of touch units; the first wiring structure is arranged in the peripheral area and is formed by laminating a second metal layer and a third metal layer; the second wiring structure is arranged in the peripheral area and consists of a second metal layer; the supporting pad is arranged on the second wiring structure, and the position of the supporting pad corresponds to that of the second wiring structure; the second substrate is arranged opposite to the first substrate; the first wiring structures and the second wiring structures are alternately arranged, the second metal layers are respectively and electrically connected to the pixel units or the touch units, and the third metal layers are respectively and electrically connected to the pixel units or the touch units.

Description

Display device

Technical Field

The present invention relates to a display device, and more particularly, to a display device with good display effect.

Background

With the development of science and technology, touch display devices are widely applied to many electronic products, such as mobile phones, tablet computers, watches, and the like.

The conventional touch display device is usually manufactured by a low temperature poly-silicon process (LTPS), and the pixel units and the control circuit are electrically connected by a wiring (fan out). When a flat layer (PL) is generally formed on an active element (TFT) array substrate of a touch display device, and a third metal layer (M3) is used to transmit a touch signal and reduce a driving voltage, a method of hollowing out the flat layer is generally used in an area where the third metal layer is required to be formed in a large range, and thus, a support pad (Bump) cannot be formed in a corresponding area. For the conventional process, the thickness of the support pad is about 5500 angstroms, and the thickness of the third metal layer is about 3700 angstroms, so that a height difference of about 1800 angstroms is generated between the region where the third metal layer is formed and the region where the third metal layer is not formed, and further, the problem of non-uniform display of the touch display device is caused.

Therefore, how to better avoid the large-area height difference in different areas of the display panel, reduce the occurrence of uneven display, and improve the display effect of the product is one of the problems to be solved.

Disclosure of Invention

The embodiment of the invention provides a display device, which can better avoid large-area height drop in different areas of a display panel, reduce the phenomenon of uneven display and improve the display effect of a product.

An embodiment of the invention provides a display device, which includes: the display device comprises a first substrate, a second substrate and a third substrate, wherein the first substrate is provided with a peripheral area and a display area which are arranged adjacently, and the display area is provided with a plurality of pixel units or a plurality of touch units; the first wiring structure is arranged in the peripheral area and is formed by laminating a second metal layer and a third metal layer; the second wiring structure is arranged in the peripheral area and consists of a second metal layer; the supporting pad is arranged on the second wiring structure, and the position of the supporting pad corresponds to that of the second wiring structure; the second substrate is arranged opposite to the first substrate; the first wiring structures and the second wiring structures are alternately arranged, the second metal layers are respectively and electrically connected to the pixel units or the touch units, and the third metal layers are respectively and electrically connected to the pixel units or the touch units.

The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.

Drawings

Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the invention.

FIG. 2A is a cross-sectional view of a wiring structure along line A-A' of FIG. 1 according to an embodiment.

Fig. 2B is a schematic cross-sectional view of a wiring structure along the line a-a' in fig. 1 according to another embodiment.

Fig. 3A is a schematic cross-sectional view of the area Q1 in fig. 1.

Fig. 3B is a schematic cross-sectional view of the area Q2 in fig. 1.

Reference numerals

100: display device

101: first substrate

102: second substrate

105: first wiring structure

106: second wiring structure

AA: display area

BA: peripheral zone

CA center area

IC: control circuit

PL: planarization layer

M2: second metal layer

M3: a third metal layer

BP: supporting pad

PS 1: first supporting structure

PS 2: second support structure

Q1, Q2: region(s)

D1: the first wiring region

D2: second wiring region

D3: third wiring area

D4: the fourth wiring region

W1: first width

W2: second width

W3: third width

W4: fourth width

Detailed Description

The invention will be described in detail with reference to the following drawings, which are provided for illustration purposes and the like:

fig. 1 is a schematic structural diagram of a display device according to an embodiment of the invention. As shown in fig. 1, the display device 100 includes a first substrate 101 and a second substrate 102, wherein the first substrate 101 and the second substrate 102 are disposed opposite to each other. In the embodiment, the first substrate 101 has a display area AA and a peripheral area BA adjacent to each other, a plurality of pixel units or a plurality of touch units (not shown) are disposed in the display area AA, and the plurality of pixel units or the plurality of touch units may be arranged in an array, for example, a plurality of rows along a first direction (e.g., an X direction) and a plurality of rows along a second direction (e.g., a Y direction), and each pixel unit has at least one thin film transistor (not shown). The peripheral area BA on the first substrate 101 is provided with a control circuit IC, a first wiring structure 105, and a second wiring structure 106. The first wiring structure 105 and the second wiring structure 106 are coupled to the control circuit IC and electrically connected to the pixel units or the touch units, respectively, and the control circuit IC realizes transmission of control signals and data between the pixel units or the touch units through the first wiring structure 105 and the second wiring structure 106. As shown in fig. 3A and 3B, the first wiring structure 105 is formed by stacking the second metal layer M2 and the third metal layer M3, and the second wiring structure 106 is formed by the second metal layer M2, that is, the second wiring structure 106 includes the second metal layer M2 but does not include the third metal layer M3. Wherein the first wiring structures 105 and the second wiring structures 106 are alternately arranged. In an embodiment of the invention, the second metal layer M2 is electrically connected to the pixel unit, the third metal layer M3 is electrically connected to the touch unit, and more specifically, the second metal layer M2 is electrically connected to a data line (not shown) in the display area AA, the second metal layer M2 is electrically connected to the pixel unit through the data line, the third metal layer M3 is electrically connected to a touch signal line (not shown) in the display area AA, and the third metal layer M3 is electrically connected to the touch unit through the touch signal line. In addition, the peripheral area BA further includes a first metal layer (not shown in the figure), the first metal layer is electrically connected to the scan lines in the display area AA, and the first metal layer is electrically connected to the pixel units through the scan lines; for example, in another embodiment, the second metal layer M2 and the third metal layer M3 are electrically connected to the pixel unit, in detail, the second metal layer M2 and the third metal layer M3 are electrically connected to a data line (not shown) or a scan line (not shown) in the display area AA, and the second metal layer M2 and the third metal layer M3 are electrically connected to the pixel unit through the data line or the scan line.

FIG. 2A is a cross-sectional view of a wiring structure along line A-A' of FIG. 1 according to an embodiment. Fig. 2B is a schematic cross-sectional view of a wiring structure along the line a-a' in fig. 1 according to another embodiment. Fig. 3A is a schematic cross-sectional view of the area Q1 in fig. 1. Fig. 3B is a schematic cross-sectional view of the area Q2 in fig. 1.

As shown in fig. 2A, fig. 2B, fig. 3A and fig. 3B, in the present embodiment, a planarization layer PL is also disposed on the first substrate 101 of the display device 100, the planarization layer PL covers the second metal layer M2, and the third metal layer M3 is disposed on the planarization layer PL. In other words, the second metal layer M2 is disposed between the first substrate 101 and the planarization layer PL, and the planarization layer PL is disposed between the second metal layer M2 and the third metal layer M3. The flat layer PL and the support pads BP belong to the same film layer, and the positions of the support pads BP and the positions of the second wiring structures 106 substantially correspond to each other, wherein the number of the support pads BP may be set according to the width of the wiring regions corresponding to the second wiring structures 106. Due to the difference in thickness between the support pad BP and the third metal layer M3, a recess is formed between the support pads BP, and the third metal layer M3 is disposed in the recess, so that the position of the first wiring structure 105 and the position of the recess correspond to each other.

As shown in fig. 3A and 3B, in the present embodiment, the second substrate 102 is provided with a first supporting structure PS1 and a second supporting structure PS 2. Wherein the first supporting structure PS1 is used to support the third metal layer M3, in other words, the position of the first supporting structure PS1 corresponds to the position of the first wiring structure 105; the second supporting structure PS2 is used to support the supporting pad BP, in other words, the position of the second supporting structure PS2 corresponds to the position of the second wiring structure 106, in a preferred embodiment, the second supporting structure PS2 is opposite to the second wiring structure 106, but not limited thereto, and there may be a gap therebetween.

As shown in fig. 2A and 2B, the first wiring region D1, the second wiring region D2, the third wiring region D3, and the fourth wiring region D4 may be sequentially divided along the central region CA of the display device 100 to the left and right (fig. 2A and 2B only show the left region of the central region CA, and the right region is symmetrical to the left region). The first wire region D1 has a first width W1, the second wire region D2 has a second width W2, the third wire region D3 has a third width W3, and the fourth wire region D4 has a fourth width W4. The first wiring structure 105 is disposed in the first wiring region D1 and the third wiring region D3, and the second wiring structure 106 is disposed in the second wiring region D2 and the fourth wiring region D4. That is, the first wiring structures 105 and the second wiring structures 106 are alternately arranged in sequence, extending to the left and right along the central area CA of the display device 100.

As shown in fig. 2A, in the present embodiment, the first width W1, the second width W2, the third width W3 and the fourth width W4 are equal, that is, the first wiring region D1, the second wiring region D2, the third wiring region D3 and the fourth wiring region D4 are the same, and the value of the first width W1 is set to be 100um or less.

As shown in fig. 2B, in the present embodiment, the first width W1< the second width W2< the third width W3< the fourth width W4, that is, the first wiring region D1, the second wiring region D2, the third wiring region D3, and the fourth wiring region D4 are gradually widened, and the value of the fourth width W4 is set to be 100um or less. Of course, in other embodiments, it may be set that the first width W1> the second width W2> the third width W3> the fourth width W4, that is, the first wiring region D1, the second wiring region D2, the third wiring region D3, and the fourth wiring region D4 are gradually narrowed, and the value of the first width W1 is set to be 100um or less.

In summary, according to the embodiments of the invention, in the directions extending to the left and right sides along the central region of the display device, by alternately arranging the first wiring structures and the second wiring structures and limiting the widths of the wiring regions, the large-area height difference in different regions of the display panel due to the thickness difference between the supporting pads and the third metal layer can be avoided, thereby reducing the occurrence of uneven display and improving the display effect of the product. In addition, according to the embodiments of the present invention, the first and second wiring structures are designed to be laid out according to the requirements, such as a low temperature polysilicon liquid crystal panel with a high refresh rate, a narrow frame in-cell touch liquid crystal panel, or a low power consumption liquid crystal panel, but not limited thereto.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A display device, comprising:

the display device comprises a first substrate, a second substrate and a third substrate, wherein the first substrate is provided with a peripheral area and a display area which are arranged adjacently, and the display area is provided with a plurality of pixel units or a plurality of touch units;

the first wiring structure is arranged in the peripheral area and is formed by laminating a second metal layer and a third metal layer;

the second wiring structure is arranged in the peripheral area and consists of the second metal layer;

a planarization layer disposed between the second metal layer and the third metal layer;

the supporting pads are arranged on the flat layer and are of the same film layer as the flat layer, the positions of the supporting pads correspond to the second wiring structure, a concave area is formed between the supporting pads, and the third metal layer is arranged in the concave area; and

the second substrate is arranged opposite to the first substrate;

the first wiring structures and the second wiring structures are alternately arranged, the second metal layers are respectively and electrically connected to the pixel units or the touch units, and the third metal layers are respectively and electrically connected to the pixel units or the touch units.

2. The display device according to claim 1, wherein the first wiring structure is disposed on a first wiring region and a third wiring region, the first wiring region has a first width, the third wiring region has a third width, the second wiring structure is disposed on a second wiring region and a fourth wiring region, the second wiring region has a second width, the fourth wiring region has a fourth width, and the first wiring region, the second wiring region, the third wiring region and the fourth wiring region are sequentially arranged along a first direction.

3. The display device of claim 2, wherein the first width, the second width, the third width, and the fourth width are equal.

4. The display device of claim 2, wherein the first width is greater than the second width, the second width is greater than the third width, and the third width is greater than the fourth width.

5. The display device of claim 2, wherein the first width is less than the second width, the second width is less than the third width, and the third width is less than the fourth width.

6. The display device according to claim 3 or 4, wherein the first width is 100 μm or less.

7. The display device according to claim 5, wherein the fourth width is 100 μm or less.

8. The display device according to claim 1, further comprising a first support structure disposed on the second substrate, wherein a position of the first support structure corresponds to a position of the first wiring structure.

9. The display device according to claim 1, further comprising a second support structure disposed on the second substrate, wherein a position of the second support structure corresponds to a position of the second wiring structure.