TWI707262B - Touch display panel - Google Patents

Abstract

A touch display panel includes a first substrate, a plurality of pixel units, at least one sensing unit, a first pad, and a second pad. The first substrate defines a display area and a peripheral area, and disposed in the peripheral region and electrically connected to the pixel unit. The first pad includes a first patterned metal layer and a first patterned transparent conductive layer, the first patterned transparent conductive layer covering an upper surface and a side surface of the first patterned metal layer. The second pad is disposed in the peripheral area and electrically connected to the sensing unit. The second pad includes: a second patterned metal layer disposed on the first substrate; a first transparent conductive layer covers the upper surface of the second patterned metal layer, the first transparent conductive layer is disposed on the display area, and extends from the display area to the second pad; a third patterned metal layer is disposed on the upper surface and the side surface of the first transparent conductive layer.

Description

Touch display panel

The present invention relates to the field of display panels, in particular to a touch display panel with a narrow frame.

With the development of technology, touch display panels are applied to many electronic products, such as mobile phones, tablet computers, watches, etc., and touch devices and display panels are often used in combination. Currently, many manufacturers have proposed technologies for integrating touch devices into display panels. Compared with attaching the touch device to the outside of the display panel, integrating the touch device into the display panel can reduce the overall thickness of the product.

The touch display panel includes a pad area, and a plurality of pads are arranged in the pad area to be electrically connected to an external driving circuit such as an integrated circuit and a flexible circuit board. In the prior art, a bare metal layer is generally used as a contact area to directly connect to an external driving circuit. However, when the frame area of the touch display panel becomes narrower, the width of the metal pad in the contact area becomes narrower, or the distance between two adjacent metal pads becomes smaller and smaller. As a result, during the subsequent etching process of the metal layer (such as the touch metal layer), the etching solution will damage the exposed metal layer, thereby affecting the production yield of the touch display panel.

The main purpose of the present invention is to provide a touch display panel to solve the etching damage to the metal layer used as a gasket during the manufacturing process of the touch display panel in the prior art.

In order to achieve the above objective, the present invention provides a touch display panel including a first substrate, a plurality of pixel units, at least one sensing unit, at least one first pad, and at least one second pad.

The first substrate defines a display area and a peripheral area; a plurality of pixel units are disposed in the display area of the first substrate; at least one sensing unit is disposed in the display area of the first substrate; at least one first spacer is disposed on the display area of the first substrate The peripheral area is electrically connected to at least one pixel unit. At least one second pad is disposed on the peripheral area of the first substrate and is electrically connected to at least one sensing unit.

The first pad includes a first patterned metal layer and a first patterned transparent conductive layer. The first patterned metal layer is arranged on the first substrate; the first patterned transparent conductive layer covers an upper surface and a side surface of the first patterned metal layer.

The second pad includes a second patterned metal layer, a first transparent conductive layer, and a third patterned metal layer. The second patterned metal layer is disposed on the first substrate, and the second patterned metal layer and the first patterned metal layer are made of the same material and have separate structures; the first transparent conductive layer covers the upper surface of the second patterned metal layer , And the first patterned transparent conductive layer and the first transparent conductive layer are made of the same material and have separate structures. The first transparent conductive layer is disposed in the display area and extends from the display area to the second pad; the third patterned metal The layer is arranged on the upper surface and the side surface of the first transparent conductive layer.

In the touch display panel of the present invention, in one embodiment, the pixel unit includes a display electrode layer, and the display electrode layer is electrically connected to the first patterned metal layer; the sensing unit includes a touch metal layer, and a touch metal layer It is the same material as the third patterned metal layer; the touch display panel further includes a protective layer disposed between the display electrode layer and the first transparent conductive layer, and the first transparent conductive layer is located between the protective layer and the touch metal layer.

In the touch display panel of the present invention, in one embodiment, the protective layer extends from the display area to the peripheral area, wherein, in the peripheral area, part of the first patterned metal layer is exposed outside the protective layer, and the first The patterned transparent conductive layer covers a portion of the first patterned metal layer to form a first pad.

In the touch display panel of the present invention, in one embodiment, in the area adjacent to the first liner, the first transparent conductive layer is located on the upper surface of the protective layer, and the first patterned transparent conductive layer is located on the upper surface of the protective layer. On the side, there is a distance between the first transparent conductive layer and the first patterned transparent conductive layer.

In the touch display panel of the present invention, in an embodiment, the pitch is greater than or equal to 5 μm.

D，且D

1.5μm。 In the touch display panel of the present invention, in one embodiment, the first patterned transparent conductive layer overlaps the protective layer by a distance W, and the edge of the first patterned transparent conductive layer and the corresponding edge of the first patterned metal layer A distance D, W

D, and D

1.5μm.

In the touch display panel of the present invention, in one embodiment, where the first patterned transparent conductive layer overlaps the protective layer, the protective layer has inclined sides, and the first patterned transparent conductive layer covers the distance W of the inclined sides.

In the touch display panel of the present invention, in one embodiment, a portion of the first patterned metal layer that is projected vertically on the first substrate has a first outline, and the side adjacent to the first outline and the protective layer has a first side , The first patterned transparent conductive layer is vertically projected on the first substrate to have a second contour, the second contour and the protective layer adjacent side has a first edge, the second contour completely covers the first contour, the first side and the first The edges are separated by a distance W.

In the touch display panel of the present invention, in an embodiment, the first profile further includes a second side, a third side, and a fourth side, and the second side, the third side and the The fourth side is a distance D from the corresponding edge of the second contour.

In the touch display panel of the present invention, in an embodiment, the first patterned metal layer, the second patterned metal layer, and the third patterned metal layer are each a single-layer or multi-layer structure, and the first patterned transparent conductive The material of the layer and the first transparent conductive layer is metal oxide.

The beneficial effects of the present invention: the first patterned transparent conductive layer in the present invention completely covers the first patterned metal layer, which can avoid causing the first patterned metal layer as the first liner to be caused when the third metal layer is etched. The front and side etching of the touch display panel avoids damage to the first liner during the manufacturing process of the touch display panel.

10: Touch display panel

100: first substrate

101: display area

102: Surrounding area

103: first liner

104: second liner

110: Thin film transistor

111: grid

112: Source

113: drain

114: channel layer

115: first metal layer

116: Patterned metal layer I

117: The first patterned metal layer

118: Patterned metal layer Ⅱ

119: second patterned metal layer

120: The first protective layer

121: first via

122: tilt side

130: the first transparent conductive layer

131: The first patterned transparent conductive layer

132: first transparent conductive layer I

133: The first transparent conductive layer Ⅱ

140: second protective layer

150: third metal layer

151: third metal layer I

152: third patterned metal layer

160: third protective layer

161: second via

170: second transparent conductive layer

180: gate insulating layer

181: third via

182: fourth via

W: distance

D: distance

L1: First side

L2: second side

L3: Third side

L4: Fourth side

H1: First edge

H2: second edge

H3: third edge

H4: Fourth edge

[Fig. 1] is a schematic top view of a touch display panel according to an embodiment of the invention.

[FIG. 2] is a schematic partial cross-sectional view of a display area of a touch display panel according to an embodiment of the invention.

[Fig. 3] is an enlarged schematic diagram of part D of the touch display panel of Fig. 1. [Fig.

[Fig. 4] is a schematic cross-sectional view of the touch display panel of Fig. 1 along A-A'.

[FIG. 5] is a schematic cross-sectional view of the touch display panel of FIG. 1 along B-B'.

[FIG. 6] is a schematic cross-sectional view of the touch display panel of FIG. 1 along C-C'.

The following is a detailed description of the embodiments of the present invention: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation modes and processes are given. The scope of protection is not limited to the following embodiments, and the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention.

FIG. 1 is a schematic top view of a touch display panel according to an embodiment of the invention. 1, the touch display panel 10 includes a first substrate 100 and a second substrate (not shown). A display area 101 and a peripheral area 102 are defined on the first substrate 100. The peripheral area 102 is located in at least one of the display area 101 Side, but the present invention is not limited to this. The display area 101 is provided with a plurality of pixel units arranged in an array and at least one sensing unit, and the peripheral area 102 is provided with at least one first pad 103 and at least one second pad 104.

The present invention does not particularly limit the structure of the pixel unit. Those skilled in the art can design according to the design requirements of the touch display panel. For example, FIG. 2 is a schematic partial cross-sectional view of a display area of a touch display panel according to an embodiment of the present invention. As shown in FIG. 2, a thin film transistor 110 is provided on a first substrate 100, wherein the thin film transistor 110 includes a gate 111, The source electrode 112, the drain electrode 113, and the channel layer 114. The thin film transistor 110 is covered with a first protection layer 120, and the first protection layer 120 is provided with a first via hole 121, wherein the first via hole 121 extends from the surface of the first protection layer 120 to the surface of the first metal layer 115, In this embodiment, the first metal layer 115 is provided in the same layer as the source 112 and the drain 113 and is connected to the drain 113. The first metal layer 115 may have a single-layer or multi-layer structure. For example, the first metal layer 115 has a Ti/Al/Ti three-layer structure or a Mo/Al/Mo three-layer structure. In addition, a first transparent conductive layer 130 is provided on part of the first protective layer 120. The first transparent conductive layer 130 completely covers the first via 121 and is in contact with the first metal layer 115. The material of the first transparent conductive layer 130 can be It is a transparent material (metal or metal oxide, the metal oxide is, for example, indium tin oxide, indium zinc oxide, cadmium tin oxide, aluminum oxide zinc, or indium zinc tin oxide, etc.), and the first transparent conductive layer 130 is, for example, a pixel electrode layer. In this embodiment, also It includes a second protective layer 140 disposed on the first protective layer 120 and the first transparent conductive layer 130, and a third metal layer 150 disposed on the second protective layer 140. The third metal layer 150 may be a single layer or multiple layers The structure, for example, the third metal layer 150 is a Ti/Al/Ti three-layer structure or a Mo/Al/Mo three-layer structure, and the third metal layer 150 is, for example, a touch metal layer. Then, the third metal layer 150 is also covered with a third protective layer 160, the third protective layer 160 is provided with a second via 161, and the second transparent conductive layer 170 is disposed on the third protective layer 160 and passes through the second via The hole 161 is in contact with the third metal layer 160, and the second transparent conductive layer 170 is, for example, a touch electrode layer.

Please refer to FIGS. 3, 4, 5 and 6. FIG. 3 is an enlarged schematic view of part D of the touch display panel of FIG. 1, and FIG. 4 is a schematic cross-sectional view of the touch display panel of FIG. 1 along AA', and FIG. 5 It is a schematic cross-sectional view of the touch display panel of FIG. 1 along BB', and FIG. 6 is a schematic cross-sectional view of the touch display panel of FIG. 1 along C-C'. As shown in the figure, the peripheral area 102 of the touch display panel 10 is provided with a plurality of first pads 103 and a plurality of second pads 104. For the sake of simplicity and ease of viewing, only one first pad is shown in the figure. 103 and a second pad 104. The first pad 103 is electrically connected to at least one pixel unit, and the second pad 104 is electrically connected to at least one sensing unit, that is, the first pad 103 is a display control pad, and the second pad 104 is Touch the control pad.

As shown in FIGS. 3, 4, and 6, the first pad 103 includes a first patterned metal layer 117 and a first patterned transparent conductive layer 131 covering the upper surface and side surfaces of the first patterned metal layer 117, The surface of the first patterned transparent conductive layer 131 is used as a contact area to communicate with a peripheral driving circuit. In this embodiment, a patterned metal layer I 116 is further provided between the first patterned metal layer 117 and the first substrate 100, and the patterned metal layer I 116 is in contact with the first patterned metal layer 117 through a via hole.

In detail, referring to FIGS. 3 and 4 at the same time, in the first pad 103, the patterned metal layer I 116 is disposed on the first substrate 100, and the patterned metal layer I 116 is the same as the gate 111 in the display area 101. Layer settings. The gate insulating layer 180 extends from the display area 101 to the first pad 103 and covers the patterned metal layer I 116. The gate insulating layer 180 is provided with a third via 181 to expose a part of the surface of the patterned metal layer I 116 , The first patterned metal layer 117 is disposed on a part of the gate insulating layer 180 and completely covers the third via 181; the first patterned metal layer 117 is electrically connected to the display electrode layer of the display area 101. In this embodiment, the first patterned metal layer A patterned metal layer 117 and the first metal layer 115 are provided in the same layer, and are electrically connected, that is, the first patterned metal layer 117 is electrically connected to the drain electrode 113. The first protection layer 120 extends from the display area 101 to the peripheral area 102. In the peripheral area 102, a portion of the first patterned metal layer 117 is exposed outside the first protection layer 120, and the first patterned transparent conductive layer 131 covers The portion of the first patterned metal layer 117 exposed outside the first protective layer 120, specifically covering the upper surface and side surfaces of the exposed first patterned metal layer 117, forms an island-like structure to form a first pad 103.

In one embodiment, the first transparent conductive layer 130 extends from the display area 101 to the peripheral area 102, and is disposed on the upper surface of the first protection layer 120 in the adjacent area of the first pad 103, and the first transparent conductive layer 130 This part of is defined as the first transparent conductive layer I 132; the first patterned transparent conductive layer 131 is located on the side of the first protection layer 120 in the area adjacent to the first liner 103, and the first patterned transparent conductive layer 131 and There is a distance between the first transparent conductive layers I 132, and the distance is, for example, the shortest distance between the first patterned transparent conductive layer 131 and the first transparent conductive layer I 132, and the distance is greater than or equal to 5 μm.

In an embodiment, the third metal layer 150 extends from the display area 101 to the peripheral area 102 and is disposed on the first transparent conductive layer I 132 to form the third metal layer I 151.

The first patterned transparent conductive layer 131 can be provided in the same layer as the first transparent conductive layer 130, or can be provided separately. The material of the first patterned transparent conductive layer 131 is metal oxide, such as indium tin oxide, indium zinc oxide, Cadmium tin oxide, aluminum zinc oxide or indium zinc tin oxide, etc. In this way, the first patterned metal layer 117 is completely covered by the first patterned transparent conductive layer 131, which can prevent the first patterned metal layer 117 as the first liner 103 from being caused when the third metal layer 150 is etched. The upper surface and the side surface are etched to avoid damage to the first pad 103 during the manufacturing process of the touch display panel 10.

D，且D

1.5μm。 In an embodiment, please refer to FIG. 3, in the first pad 103, the first patterned transparent conductive layer 131 overlaps the first protective layer 120 by a distance W, and the edge of the first patterned transparent conductive layer 131 and the first pattern The corresponding edges of the metal layer 117 are separated by a distance D, W

D, and D

1.5μm.

In detail, the first patterned transparent conductive layer 131 overlaps the first protective layer 120. At the overlap, the first protective layer 120 has an inclined side surface 122, and the first patterned transparent conductive layer 131 partially covers the inclined side surface 122. The projection distance of the portion of the inclined side surface 122 covered by the first patterned transparent conductive layer 131 in the parallel direction of the first substrate 100 is W. In other words, the portion of the first patterned metal layer 117 covered by the first patterned transparent conductive layer 131 is vertically projected on the first substrate 100 and has a first contour, and the side adjacent to the first protective layer 120 has a first side. Side L1; the first patterned transparent conductive layer 131 is vertically projected on the first substrate 100 and has a second outline, and the second outline has a first edge H1 on the side adjacent to the first protective layer 120, and the second outline completely covers the first outline , The first side L1 and the first edge H1 are separated by a distance W.

The first profile further includes a second side L2, a third side L3, and a fourth side L4, which are respectively separated by a distance D from the corresponding edge of the second profile. That is, the second contour also includes the second edge H2, The third edge H3 and the fourth edge H4, the second side L2 is at a distance D from the second edge H2, the third side L3 is at a distance D from the third edge H3, and the fourth side L4 is at a distance from the fourth edge H4 D.

As shown in FIGS. 3, 5, and 6, the second pad 104 includes a second patterned metal layer 119, a first transparent conductive layer II 133 disposed on the second patterned metal layer 119, and a second patterned The metal layer 119 and the third patterned metal layer 152 of the first transparent conductive layer II 133. In this embodiment, the second patterned metal layer 119 and the first substrate 100 further include The patterned metal layer II 118 is in contact with the second patterned metal layer 119 through the via hole. Wherein, the second patterned metal layer 119 and the first patterned metal layer 117 are made of the same material and have separate structures. The first transparent conductive layer 130 is disposed in the display area 101 and extends from the display area 101 to the second spacer 104. The second spacer 104 forms a first transparent conductive layer II 133. The first patterned transparent conductive layer 131 and the first transparent conductive layer II 133 are made of the same material and have separate structures. In this way, the surface of the third patterned metal layer 152 is used as a contact area to communicate with the peripheral driving circuit.

In detail, in the second spacer 104, the patterned metal layer II 118 is disposed on the first substrate 100, and the patterned metal layer II 118 is disposed in the same layer as the gate 111 in the display area 101. The gate insulating layer 180 extends from the display area 101 to the second pad 104 and covers the patterned metal layer II 118. The gate insulating layer 180 is provided with a fourth via 182 to expose part of the surface of the patterned metal layer II 118 The second patterned metal layer 119 is disposed on a part of the gate insulating layer 180 and completely covers the fourth via 182; the second patterned metal layer 119 is disposed in the same layer as the first metal layer 115. The first transparent conductive layer II 133 extends from the first transparent conductive layer 130 of the display area 101, and is located on the second patterned metal layer 119 (in the second pad 104 of FIG. 3, the first transparent conductive layer II 133 and the second The two patterned metal layers 119 completely overlap). Thus, the first transparent conductive layer II 133 and the first transparent It shows that the conductive layer 130 belongs to the same layer, but the structure is separated and electrically connected. In other words, the first transparent conductive layer II 133, the first transparent conductive layer 130 and the first transparent conductive layer I 132 are arranged in the same layer, the materials are the same, and the structures are separated. The first patterned transparent conductive layer 131 can be provided in the same layer as the first three, or can be deposited separately. The third metal layer 150 extends from the display area 101 to the second liner 104 and is disposed on the first transparent conductive layer II 133. A third patterned metal layer 152 is formed on the second liner 104. In one embodiment, the third patterned metal layer 152 is disposed on the upper surface of the first transparent conductive layer II 133. In another embodiment, the third patterned metal layer 152 is disposed on the upper surface of the first transparent conductive layer II 133. The upper surface and the sides of the first transparent conductive layer II 133 and the second patterned metal layer 119.

In summary, the touch display panel of the present invention includes a pixel unit and a sensing unit located in the display area, and a first pad and a second pad located in the peripheral area. The first pad includes a first patterned metal layer The first patterned metal layer is used as a contact area to contact the external driving circuit. The present invention covers the first patterned transparent conductive layer on the upper surface and sides of the first patterned metal layer, so that the third In the case of the metal layer (ie, the touch metal layer), the etching liquid is prevented from damaging the first patterned metal layer as the liner, and the manufacturing yield of the narrow-frame touch display panel is improved.

It should be noted that the above embodiments are described with a pixel structure including bottom gate transistors as an example, but the pixel structure of the display area of the touch display panel of the present invention is not limited to this, that is, the spacer structure of the present invention can be It is suitable for the design of various display panels.

Of course, the present invention can also have various other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various methods according to the present invention. There are corresponding changes and deformations, but these corresponding changes and deformations should fall within the protection scope of the patent application of the present invention.

10: Touch display panel

100: first substrate

101: display area

102: Surrounding area

103: first liner

104: second liner

Claims (10)

A touch display panel includes: a first substrate defining a display area and a peripheral area; a plurality of pixel units arranged on the display area of the first substrate; at least one sensing unit arranged on the first substrate The display area; at least one first pad, disposed in the peripheral area of the first substrate, and electrically connected to at least one pixel unit, wherein the first pad includes: a first patterned metal layer , Disposed on the first substrate; and a first patterned transparent conductive layer, covering an upper surface and a side surface of the first patterned metal layer; and at least one second spacer, disposed on the first substrate The peripheral area is electrically connected to at least one of the sensing units, wherein the second pad includes: a second patterned metal layer disposed on the first substrate, and the second patterned metal layer and The first patterned metal layer is of the same material and has separate structures; a first transparent conductive layer covering an upper surface of the second patterned metal layer, and the first patterned transparent conductive layer and the first transparent conductive layer The same material and separated structure, wherein the first transparent conductive layer is disposed in the display area and extends from the display area to the second spacer; and a third patterned metal layer is disposed on the first transparent conductive layer One upper surface and one side surface. The touch display panel according to claim 1, wherein the pixel unit includes a display electrode layer, and the display electrode layer is electrically connected to the first patterned metal layer; the sensing unit includes It includes a touch metal layer, the touch metal layer and the third patterned metal layer are made of the same material; the touch display panel further includes a protective layer disposed between the display electrode layer and the first transparent conductive layer , The first transparent conductive layer is located between the protective layer and the touch metal layer. The touch display panel according to claim 2, wherein the protective layer extends from the display area to the peripheral area, wherein, in the peripheral area, part of the first patterned metal layer is exposed outside the protective layer, And the first patterned transparent conductive layer covers the part of the first patterned metal layer to form the first liner. The touch display panel according to claim 3, wherein in an area adjacent to the first pad, the first transparent conductive layer is located on an upper surface of the protective layer, and the first patterned transparent conductive layer is located on the On one side of the protective layer, there is a gap between the first transparent conductive layer and the first patterned transparent conductive layer. The touch display panel according to claim 4, wherein the pitch is greater than or equal to 5 μm. The touch display panel according to claim 3, wherein the first patterned transparent conductive layer overlaps the protective layer by a distance W, and the edge of the first patterned transparent conductive layer corresponds to that of the first patterned metal layer The edges are a distance D, W

D, and D

1.5μm. The touch display panel according to claim 6, wherein where the first patterned transparent conductive layer overlaps the protective layer, the protective layer has an inclined side surface, and the first patterned transparent conductive layer covers the inclined side surface. W. The touch display panel according to claim 6, wherein the portion of the first patterned metal layer is vertically projected on the first substrate and has a first outline, and the first outline and the protective layer have a On the first side, the first patterned transparent conductive layer is vertically projected on the first substrate The board has a second contour, the second contour has a first edge on the side adjacent to the protective layer, the second contour completely covers the first contour, and the first side is separated from the first edge by the distance W . The touch display panel according to claim 8, wherein the first outline further includes a second side, a third side, and a fourth side, and the second, third, and The fourth side is separated from the corresponding edge of the second contour by the distance D. The touch display panel according to claim 1, wherein the first patterned metal layer, the second patterned metal layer, and the third patterned metal layer are each a single-layer or multi-layer structure, and the first patterned metal layer is transparent The conductive layer and the first transparent conductive layer are made of metal oxide.

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