TWI748621B - Touch display device - Google Patents

Abstract

A touch display device includes a substrate, a first metal layer, an insulating layer, and a second metal layer. The first metal layer includes first bridge structures and second bridge structures overlapping a display area. The insulating layer is located on the first metal layer. The second metal layer is located on the insulating layer and includes first touch signal lines, signal transmission lines, and second touch signal lines. Each first touch signal line includes first line segments. Two adjacent first line segments are electrically connected to each other through a corresponding first bridge structure. Each signal transmission line includes second line segments. Two adjacent second line segments are electrically connected to each other through a corresponding second bridge structure. The second touch signal lines overlap the first bridge structures and the second bridge structures. Each signal transmission line is electrically connected to a corresponding second touch signal line.

Description

Touch display device

The present invention relates to a touch device, and more particularly to a touch display device.

With the development of technology, the appearance rate of touch devices on the market is gradually increasing, and various related technologies are also emerging in endlessly. In some electronic devices, such as mobile phones, tablet computers, smart watches, etc., a touch device and a display panel are often combined to obtain a convenient touch display device.

Generally speaking, an additional touch panel with touch function is attached to the outside of the display panel, thereby integrating the touch function and the display function into the same device. At present, the touch electrodes in the touch panel often use transparent materials, so that the image generated by the display panel can pass through the touch panel. In addition, in order to transmit the signal of the chip to the touch electrodes, metal wires are arranged in the frame area of the touch panel so that the chip can be electrically connected to the touch electrodes. However, the aforementioned metal wires make it difficult to reduce the size of the frame area of the touch display device, which seriously affects the appearance of the product.

The invention provides a touch display device with the advantage of a narrow frame.

At least one embodiment of the present invention provides a touch display device including a substrate, a first metal layer, an insulating layer, and a second metal layer. The substrate has a display area and a peripheral area located on at least one side of the display area. The first metal layer includes a plurality of first bridge structures and a plurality of second bridge structures overlapping the display area. The insulating layer is located on the first metal layer. The second metal layer is located on the insulating layer and includes a plurality of first touch signal lines, a plurality of signal transmission lines, and a plurality of second touch signal lines. A plurality of first touch signal lines overlap the display area. Each first touch signal line includes a plurality of first line segments extending along the first direction. Two adjacent first line segments of each first touch signal line are electrically connected to each other through the corresponding first bridge structure. Multiple signal transmission lines overlap the display area. Each signal transmission line includes a plurality of second line segments extending along the first direction. Two adjacent second line segments of each signal transmission line are electrically connected to each other through the corresponding second bridge structure. A plurality of second touch signal lines overlap the display area and extend along the second direction. The second touch signal line overlaps the first bridge structure and the second bridge structure. Each signal transmission line is electrically connected to the corresponding second touch signal line.

10: Touch display device

100, 100a, 100b: touch panel

110: substrate

120: The first metal layer

122: The first bridge structure

124: Second bridge structure

130: insulating layer

140: second metal layer

142: The first touch signal line

142a: the first line segment

144: signal transmission line

144a: second line segment

146: The second touch signal line

148: Dummy Electrode

150: driver chip

162: The first fan-out line

164: The second fanout line

170: Transparent conductive layer

172: The first touch electrode

174: Signal transmission structure

176: second touch electrode

178: Floating electrode

200: display panel

AA1, AA2: display area

BA1, BA2: Surrounding area

DR1: First direction

DR2: Second direction

O1: first opening

O2: second opening

O3: third opening

U1, U2: touch unit

FIG. 1 is a schematic cross-sectional view of a touch display device according to an embodiment of the invention.

FIG. 2 is a schematic top view of a touch panel according to an embodiment of the invention.

3A to 3D are schematic top views of a manufacturing method of a touch panel according to an embodiment of the present invention.

FIG. 4 is a schematic top view of a touch panel according to an embodiment of the invention.

FIG. 5 is a schematic top view of a touch panel according to an embodiment of the invention.

FIG. 6 is a schematic top view of a touch panel according to an embodiment of the invention.

FIG. 1 is a schematic cross-sectional view of a touch display device according to an embodiment of the invention.

Please refer to FIG. 1, the touch display device 10 includes a touch panel 100 and a display panel 200. The touch panel 100 overlaps the display panel 200. The touch panel 100 has a display area AA1 and a peripheral area BA1 located on at least one side of the display area AA1. The display panel 200 has a display area AA2 and a peripheral area BA2 located on at least one side of the display area AA2. The display area AA1 of the touch panel 100 overlaps the display area AA2 of the display panel 200. The display area AA1 of the touch panel 100 has a light-transmitting structure, and the image generated by the display area AA2 of the display panel 200 can pass through the display area AA1 of the touch panel 100.

In some embodiments, the display panel 200 is a liquid crystal display panel, a micro-LED display panel, or an organic light-emitting diode display panel (OLED display panel). Or other types of display panels. When the display panel 200 is a liquid crystal display panel, the touch display device 10 further includes a backlight module, the backlight module is located on the back of the display panel 200, and the touch panel 100 is located on the front of the display panel 200.

FIG. 2 is a schematic top view of a touch panel according to an embodiment of the invention.

Please refer to FIG. 2, the substrate 110 has a display area AA1 and a peripheral area BA1 located on at least one side of the display area AA1.

A plurality of first touch signal lines 142 overlap the display area AA1 and extend along the first direction DR1. A plurality of signal transmission lines 144 overlap the display area AA1 and extend along the first direction DR1. A plurality of second touch signal lines 146 overlap the display area AA1 and extend along the second direction DR2. In this embodiment, one of the first touch signal line 142 and the second touch signal line 146 is a driving electrode (Tx), and the other is a sensing electrode (Rx).

In this embodiment, the signal transmission line 144 is electrically connected to the corresponding second touch signal line 146. In this embodiment, each second touch signal line 146 is electrically connected to more than two signal transmission lines 144, thereby improving the signal on the second touch signal line 146 because the second touch signal line 146 itself The problem of attenuation due to resistance.

In this embodiment, the touch panel has a plurality of touch units U1 and a plurality of touch units U2. In the touch unit U1 and the touch unit U2, the first touch signal line 142 crosses the second touch signal line 146 through the first bridge structure. In the touch unit U1, the second touch signal line 146 is connected to the corresponding signal transmission line 144 through the second bridge structure. In the touch unit U2, the signal transmission line 144 passes through the second bridge The structure crosses the second touch signal line 146. The first bridge structure and the second bridge structure in the touch unit U1 and the touch unit U2 will be described in FIGS. 3A to 3D and FIG. 4.

The driving chip 150 overlaps the peripheral area BA1. A plurality of first fan-out lines 162 overlap the peripheral area BA1 and are electrically connected to the driving chip 150 to the first touch signal line 142. A plurality of second fan-out lines 164 overlap the peripheral area BA1 and are electrically connected to the driving chip 150 to the signal transmission line 144. In this embodiment, the first fan-out line 162 and the second fan-out line 164 belong to the first metal layer and the second metal layer, respectively, but the invention is not limited thereto. In other embodiments, the first fan-out line 162 and the second fan-out line 164 belong to the second metal layer and the first metal layer, respectively. Since the first fan-out line 162 and the second fan-out line 164 belong to different metal layers, the first fan-out line 162 and the second fan-out line 164 will not be short-circuited even if they overlap each other, thereby reducing the area required for wiring. .

In this embodiment, the touch panel has a driving chip 150. In other embodiments, the touch panel has a plurality of driving chips 150. In some embodiments, the driving chip 150 is electrically connected to the first fan-out line 162 and the second fan-out line 164 through a flexible circuit board (not shown).

In this embodiment, since the first touch signal line 142 and the signal transmission line 144 overlap the display area AA1 and extend along the first direction DR1, the first fan-out line 162 and the second fan-out line 164 only need to extend To one side (for example, the lower side) of the display area AA1, the signal provided by the driver chip 150 can be transmitted to the first touch signal line 142 and the second touch signal line 146, thereby reducing the area of the peripheral area BA1. In some embodiments, the touch display device has three-sided narrow borders or three-sided non- The advantages of the border.

3A to 3D are schematic top views of a manufacturing method of a touch panel according to an embodiment of the present invention, wherein FIGS. 3A to 3D are schematic top views of the manufacturing method of the touch unit U1 in FIG. 2.

Please refer to FIG. 2 and FIG. 3A to form the first metal layer 120 on the substrate 110. The first metal layer 120 includes a plurality of first bridge structures 122 and a plurality of second bridge structures 124. In this embodiment, each touch unit includes a first bridge structure 122 and a second bridge structure 124 that are separated from each other. The first bridge structure 122 and the second bridge structure 124 overlap the display area of the substrate 110.

In this embodiment, the first metal layer 120 includes a mesh structure. For example, the first bridge structure 122 and the second bridge structure 124 are conductive metal meshes.

In some embodiments, the first fan-out line 162 and/or the second fan-out line 164 also belong to the first metal layer 120. In other words, when the first bridge structure 122 and the second bridge structure 124 are formed, the first fan-out line 162 and/or the second fan-out line 164 are formed at the same time.

2 and 3B, an insulating layer 130 is formed on the first metal layer 120. The insulating layer has a plurality of first openings O1, a plurality of second openings O2, and a plurality of third openings O3. In the touch unit U1 and the touch unit U2, each first bridge structure 122 overlaps two first openings O1, and each second bridge structure 124 overlaps two second openings O2. The second bridge structure 124 in the touch unit U1 also overlaps the third opening O3, and the third opening O3 is located between the two corresponding second openings O2.

2 and 3C, a second metal layer 140 is formed on the insulating layer 130 superior. The second metal layer 140 includes a first touch signal line 142, a signal transmission line 144 and a second touch signal line 146.

Each first touch signal line 142 includes a plurality of first line segments 142a extending along the first direction DR1. Two adjacent first line segments 142 a of each first touch signal line 142 are electrically connected to each other through the corresponding first bridge structure 122. For example, the first line segment 142a is filled in the first opening O1, and each first bridge structure 122 is electrically connected to the corresponding two first line segments 142a through the corresponding two first openings O1.

Each signal transmission line 144 includes a plurality of second line segments 144a extending along the first direction DR1. Two adjacent second line segments 144 a of each signal transmission line 144 are electrically connected to each other through the corresponding second bridge structure 124. For example, the second line segment 144a is filled in the second opening O2, and each second bridge structure 124 is electrically connected to the corresponding two second line segments 144a through the corresponding two second openings O2.

The second touch signal line 146 extends along the second direction DR2. The second touch signal line 146 overlaps the first bridge structure 122 and the second bridge structure 144. The first touch signal line 142 crosses the second touch signal line 146 through the first bridge structure 122. Each second touch signal line 146 is electrically connected to the corresponding signal transmission line. For example, in the touch unit U1, the second touch signal line 146 is electrically connected to a corresponding second bridge structure 124 through a corresponding third opening O3, and is connected to a corresponding second bridge structure 124 through the second bridge structure Corresponding signal transmission line 144. There is no third opening O3 in the touch unit U2, and the signal transmission line 144 crosses the second touch signal line 146 through the second bridge structure.

In this embodiment, the second metal layer 140 further includes a plurality of dummy electrodes 148. The dummy electrode 148 overlaps the display area AA1 and is separated from the first touch signal line 142, the second touch signal line 146, and the signal transmission line 144.

In this embodiment, the second metal layer 140 includes a mesh structure. For example, the first touch signal line 142, the signal transmission line 144, the second touch signal line 146, and the dummy electrode 148 are conductive metal meshes.

In some embodiments, the first fan-out line 162 and/or the second fan-out line 164 also belong to the second metal layer 140. In other words, while forming the first touch signal line 142, the signal transmission line 144, the second touch signal line 146, and the dummy electrode 148, the first fan-out line 162 and/or the second fan-out line 164 are formed.

2 and 3D, a transparent conductive layer 170 is formed on the second metal layer 140. The transparent conductive layer 170 includes a plurality of first touch electrodes 172, a plurality of signal transmission structures 174, a plurality of second touch electrodes 176, and a plurality of floating electrodes 178.

Each first touch electrode 172 overlaps a corresponding first line segment 142a. Each signal transmission structure 174 overlaps a corresponding second line segment 144a. Each second touch electrode 176 overlaps a corresponding second touch signal line 146. The first touch electrode 172, the signal transmission structure 174, and the second touch electrode 176 are separated from each other. Each floating electrode 178 overlaps a corresponding dummy electrode 148.

In some embodiments, the transparent conductive layer 170 has a plurality of slits (not shown), thereby increasing the transmittance of the transparent conductive layer 170. For example, the first touch electrode 172, the plurality of signal transmission structures 174, the plurality of second touch electrodes 176, and the plurality of floating electrodes 178 each have a plurality of slits. In some embodiments, the aforementioned slits do not overlap the first metal layer and the second metal layer.

4 is a schematic top view of a touch panel according to an embodiment of the present invention, wherein FIG. 4 is a schematic top view of the touch unit U2 in FIG. 2.

2 and 4, in the touch unit U2, the signal transmission line 144 crosses the second touch signal line 146 through the second bridge structure.

FIG. 5 is a schematic top view of a touch panel according to an embodiment of the invention. It must be noted here that the embodiment of FIG. 5 uses the element numbers and part of the content of the embodiment of FIG. 2, wherein the same or similar reference numbers are used to represent the same or similar elements, and the description of the same technical content is omitted. For the description of the omitted parts, please refer to the foregoing embodiment, which will not be repeated here.

The difference between the touch panel 100a of FIG. 5 and the touch panel 100 of FIG. 4 is that in the touch panel 100a, the first fan-out line 162 and the second fan-out line 164 do not overlap each other.

Referring to FIG. 5, the first fan-out lines 162 and the second fan-out lines 164 are staggered at one end close to the driving chip 150, so the first fan-out lines 162 and the second fan-out lines 164 do not overlap each other.

Since the first fan-out line 162 and the second fan-out line 164 do not overlap each other, the signal on the first fan-out line 162 and the signal on the second fan-out line 164 are prevented from interfering with each other.

FIG. 6 is a schematic top view of a touch panel according to an embodiment of the invention. It must be noted here that the embodiment of FIG. 6 uses the element numbers and part of the content of the embodiment of FIG. 2, wherein the same or similar reference numbers are used to represent the same or similar elements, and the description of the same technical content is omitted. About the omitted part For the description, please refer to the foregoing embodiment, which will not be repeated here.

The difference between the touch panel 100b of FIG. 6 and the touch panel 100 of FIG. 4 is that in the touch panel 100b, the first fan-out line 162 and the second fan-out line 164 belong to the same conductive layer.

Please refer to FIG. 6. In this embodiment, the first fan-out line 162 and the second fan-out line 164 belong to the first metal layer (please refer to FIG. 3C). In other embodiments, both the first fan-out line 162 and the second fan-out line 164 belong to the second metal layer (please refer to FIG. 3A).

In this embodiment, the first fan-out line 162 and the second fan-out line 164 are arranged alternately at one end close to the driving chip 150, so the first fan-out line 162 and the second fan-out line 164 do not overlap each other.

Since the first fan-out line 162 and the second fan-out line 164 do not overlap each other, the signal on the first fan-out line 162 and the signal on the second fan-out line 164 are prevented from interfering with each other.

In summary, in the touch display panel of the present invention, the signal transmission line overlaps the display area and extends along the first direction. Therefore, the first fan-out line and the second fan-out line only need to extend into the display area. One side (such as the bottom side) can transmit the signal provided by the driver chip to the first touch signal line and the second touch signal line, thereby enabling the touch display device to have a three-sided narrow border or a three-sided borderless advantage.

100: Touch panel

110: substrate

142: The first touch signal line

144: signal transmission line

146: The second touch signal line

150: driver chip

162: The first fan-out line

164: The second fanout line

AA1: Display area

BA1: Surrounding area

DR1: First direction

DR2: Second direction

U1, U2: touch unit

Claims (10)

A touch display device includes: A substrate having a display area and a peripheral area located on at least one side of the display area; A first metal layer, including: A plurality of first bridge structures and a plurality of second bridge structures overlap the display area; An insulating layer located on the first metal layer; A second metal layer is located on the insulating layer and includes: A plurality of first touch signal lines overlap the display area, each of the first touch signal lines includes a plurality of first line segments extending along a first direction, and each of the first touch signal lines is adjacent The two first line segments of are electrically connected to each other through the corresponding first bridge structure; A plurality of signal transmission lines overlap the display area, each signal transmission line includes a plurality of second line segments extending along the first direction, and two adjacent second line segments of each signal transmission line pass through the corresponding second bridge Structures and are electrically connected to each other; and A plurality of second touch signal lines overlap the display area and extend along a second direction, wherein the second touch signal lines overlap the first bridge structures and the second bridge structures, and Each of the signal transmission lines is electrically connected to the corresponding second touch signal line. The touch display device according to claim 1, wherein the second metal layer further includes: A plurality of dummy electrodes overlap the display area and are separated from the first touch signal lines, the second touch signal lines, and the signal transmission lines. The touch display device according to claim 2, further comprising: A transparent conductive layer is located on the second metal layer and includes: A plurality of first touch electrodes, each of the first touch electrodes overlaps a corresponding one of the first line segments; A plurality of second touch electrodes, each of the second touch electrodes overlaps a corresponding one of the second touch signal lines; A plurality of signal transmission structures, each of the signal transmission structures overlaps a corresponding one of the second line segments; and A plurality of floating electrodes, each of the floating electrodes overlaps a corresponding one of the dummy electrodes. The touch display device according to claim 1, wherein the first metal layer and the second metal layer include a mesh structure. The touch display device according to claim 1, further comprising: At least one driving chip overlaps the peripheral area; A plurality of first fan-out lines overlap the peripheral area and electrically connect the at least one driving chip to the first touch signal lines; and A plurality of second fan-out lines overlap the peripheral area and electrically connect the at least one driving chip to the signal transmission lines, wherein the first fan-out lines and the second fan-out lines belong to the first The metal layer and the second metal layer, or the first fan-out lines and the second fan-out lines belong to the second metal layer and the first metal layer, respectively. The touch display device according to claim 1, further comprising: At least one driving chip overlaps the peripheral area; A plurality of first fan-out lines overlap the peripheral area and electrically connect the at least one driving chip to the first touch signal lines; and A plurality of second fan-out lines overlap the peripheral area and electrically connect the at least one driving chip to the signal transmission lines, wherein the first fan-out lines and the second fan-out lines belong to the first The metal layer or the second metal layer. The touch display device according to claim 1, wherein each of the second touch signal lines is electrically connected to two or more signal transmission lines. The touch display device according to claim 1, wherein the insulating layer has a plurality of first openings, and each of the first bridge structures is electrically connected to the corresponding two of the first openings through the corresponding two of the first openings. The first line segment. The touch display device according to claim 1, wherein the insulating layer has a plurality of second openings, and each of the second bridge structures is electrically connected to the corresponding two of the second openings through the corresponding two of the second openings. The second line segment. The touch display device according to claim 9, wherein the insulating layer has a plurality of third openings, and each of the signal transmission lines is electrically connected to a corresponding one of the second bridge structures through a corresponding one of the third openings, wherein Each of the third openings is located between the corresponding two of the second openings.

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