TWI426327B - Touch panel - Google Patents

Description

Touch panel

The present invention relates to an electronic device, and more particularly to a touch panel.

A conventional touch display device is constructed by grouping a display panel and a touch panel. In order to transmit the signal generated by the user operating the touch display panel, the touch panel and the periphery of the display panel are provided with a routing area in which a plurality of transmission wires are arranged. In addition, in order to have good mechanical strength, a technique of using a transparent cover as a carrier substrate of a touch panel has been proposed. That is to say, the touch element can be directly fabricated on a transparent cover plate with better mechanical strength.

In general, if the transmission wires in the wiring area are exposed, the appearance of the overall device will be affected, so the transparent cover is often provided with a decorative layer to shield the wires with the decorative pattern in the decorative layer. Because the materials used in the decorative layer are quite diverse, not every material and the transparent cover can have good adhesion. Once the adhesion between the decorative layer and the transparent cover is poor, the decorative layer is easily peeled off, which will affect the product quality of the touch display device or such a touch panel.

The invention provides a touch panel with good quality.

The invention provides a touch panel comprising a transparent cover and a decoration a layer, a buffer layer, and a touch element. The transparent cover has a first side and a second side opposite to each other. The buffer layer is disposed on the first side of the transparent cover, and the decorative layer is disposed on the surface of the buffer layer, wherein a first adhesion between the buffer layer and the transparent cover is greater than a second adhesion between the decorative layer and the transparent cover force. The touch component is disposed on the second side.

In the touch panel of the present invention, a buffer layer is disposed between the transparent cover and the decorative layer, and the adhesion between the buffer layer and the transparent cover is greater than the adhesion between the decorative layer and the transparent cover. Therefore, in the touch panel of the present invention, the decorative layer is less likely to be peeled off and has better reliability. In addition, when the material of the buffer layer is a conductive material, the setting of the buffer layer also helps to release the static charge on the touch panel to further protect the touch panel.

The above described features and advantages of the present invention will be more apparent from the following description.

Referring to FIG. 1 to FIG. 4 , the touch panel 100 uses a transparent cover 130 as a carrier substrate. The transparent cover 130 has a first side 132 and a second side 134 , and is disposed on the transparent cover 130 . A buffer layer 140 is disposed on the periphery of the first side 132, and a decorative layer 110 is disposed on the surface of the buffer layer 140, and the touch component 120 is disposed on the second side 134.

In addition, at least one buffer layer opening 142 and a decorative layer opening 116 are respectively disposed at opposite positions of the buffer layer 140 and the decorative layer 110, so that the buffer layer opening 142 and the decorative layer opening 116 are formed as a button region 102.

The touch component 120 includes a plurality of first sensing series 122 and a plurality of second The series 124 and the plurality of transmission lines 126 are sensed. Each of the first sensing series 122 extends along a first direction D1 and is formed by a plurality of sensing electrodes E1 and a connecting line C1. The second sensing series 124 extend along a second direction D2 and are The sensing electrodes E2 are connected in series with the connecting line C2, and the first direction D1 and the second direction D2 are staggered so that the first sensing series 122 and the second sensing series 124 are staggered with each other. In addition, the transmission line 126 is disposed around the first sensing series 122 and the second sensing series 124, and each transmission line 126 is connected to one of the first sensing series 122 and the second sensing series 124.

The position of the first sensing series 122 and the second sensing series 124 may be the operating area of the touch panel 100, and the position of the transmission line 126 is the shielding area of the decorative layer 110. The decorative layer 110 can be colored or dark, and its appearance can be changed with different designs. The embodiment shown in FIG. 1 is for illustrative purposes only and is not intended to limit the invention.

In addition, the touch element 120 may further include a plurality of insulating patterns 128A and a protective layer 128B, wherein the insulating pattern 128A is disposed between the connecting lines C1 and C2 and the protective layer 128B covers the first sensing series 122, the second sense The series 124 and the transmission line 126 are measured. In the present embodiment, the structure of the touch element 120 is for illustrative purposes only and is not intended to limit the present invention. In fact, the touch element 120 can also be composed of a single layer of sensing electrode layers and at least one transmission line connected to the sensing electrode layer. Alternatively, the sensing series in the touch element 120 may take other shapes as the sensing electrodes E1, E2. Alternatively, the sensing electrodes E1, E2 and the connecting lines C1, C2 may be arranged in a different arrangement order.

a first between the buffer layer 140 and the transparent cover 130 in this embodiment The adhesion is greater than a second adhesion between the decorative layer 110 and the transparent cover 130.

In general, the adhesion between the film layer and the substrate can be judged by a hundred-square test (for example, the test method of ASTM D3359). The area in which the buffer layer 140 of the present embodiment may be peeled off in the hundred-square test is lower than the area in which the decorative layer 110 may be peeled off in the hundred-square test. In this way, by the arrangement of the buffer layer 140, the probability of the decorative layer 110 being peeled off can be reduced, and the product reliability of the touch panel 100 can be improved.

In detail, the transparent cover 130 may be made of a highly transparent material such as glass, lens, polyethylene terephthalate, polyester, polycarbonate, polymethyl methacrylate or cycloolefin copolymer. The material of the decorative layer 110 comprises a ceramic material or a diamond-like carbon (DLC) material, wherein the ceramic material comprises titanium nitride, titanium carbide, titanium carbonitride, titanium aluminum nitride, chromium nitride, chromium carbide, Chromium carbonitride, zirconium nitride, zirconium carbonitride, titanium zirconium carbon or a combination thereof. In addition, the material of the buffer layer 140 includes a metal material or a ceramic material. In an embodiment, the metallic material comprises chromium, titanium, tin, aluminum, indium, gallium or a combination thereof. Further, the ceramic material includes titanium nitride, titanium oxynitride, titanium carbonitride, titanium oxide, aluminum nitride, aluminum oxynitride, aluminum oxide, tin oxide, indium oxide, indium tin oxide, or a combination thereof.

For example, when the transparent cover 130 is made of polyethylene terephthalate and the buffer layer 140 is titanium nitride, the metal layer chrome is preferably used for the buffer layer 140 because of the adhesion of the metal titanium to the polycarbonate. However, when the transparent cover 130 is made of glass and the buffer layer 140 is titanium dioxide, titanium dioxide is preferred for the buffer layer because of the adhesion of the titanium dioxide to the glass. In addition, the texture of the diamond-like carbon It is relatively hard, and it is easy to generate large stress on the glass substrate, and the metal such as chromium, titanium and tin has better ductility, so the metal helps to buffer the stress between the diamond-like carbon and the glass substrate. Therefore, when the material of the decorative layer 110 is diamond-like carbon, the material of the buffer layer 140 may be a metal material. Furthermore, when the material of the decorative layer 110 is tantalum nitride, the material of the buffer layer 140 may be bismuth oxynitride or cerium oxide, wherein the physical properties of cerium oxynitride or cerium oxide are between tantalum nitride and glass. It helps to improve the adhesion reliability of the decorative layer 110. Similarly, when the material of the decorative layer 110 is titanium carbonitride, the material of the buffer layer 140 may be titanium oxide or aluminum oxide to improve the adhesion reliability of the decorative layer 110. Of course, the above-mentioned material matching manner is only for illustrative purposes and is not limited to the present invention. Any material that uses adhesion better than the decorative layer 110 as the buffer layer 140 can conform to the spirit of the present invention.

The buffer layer 140 is disposed on the transparent cover 130 in the buffer layer 140 of the metal material to facilitate the release of the static electricity in the touch panel 100. The charge is increased to improve the electrostatic discharge protection (ESD protection) capability of the touch panel 100.

FIG. 5 is a cross-sectional view of a touch element according to another embodiment of the present invention. Referring to FIG. 5 , a top view of the touch element 220 is as shown in FIG. 2 , for example, the touch element 220 includes a first sensing series 122 and a second sensing series 124 , and the touch element 220 is in a cross-sectional view. The middle layer further includes an insulating layer 228. Specifically, the touch element 220 is formed in the order of the connection line C1 on a substrate (not shown), and then the insulating layer 228 is formed. Then, a sensing electrode E1 and a sensing electrode E2 are formed on the insulating layer 228 (not shown in FIG. 5 For the illustration, please refer to Figure 2) and the connection line C2. In addition, the insulating layer 228 has, for example, a contact opening 228A to electrically connect the sensing electrode E1 to the connecting line C1 through the contact opening 228A. At this time, the connection line C2, the sensing electrode E1 and the sensing electrode E2 can be made of the same layer of the conductive layer, and the sensing electrode E1 and the sensing electrode E2 are simultaneously disposed on the insulating layer 228 away from the substrate (not shown). On the surface. In this embodiment, the transmission line 126 is further connected to a circuit board C. The touch component 220 can include a protective layer 128B that covers the connection line C2, the sensing electrode E1 and the sensing electrode E2, and serves to protect the connection line C2, the sensing electrode E1, and the sensing electrode E2.

FIG. 6 illustrates a touch display panel according to an embodiment of the invention. Referring to FIG. 6 , the touch display panel 300 includes a display panel 310 and a touch panel 100 disposed on the surface of the display panel 310 . As can be seen from the foregoing embodiments, the touch panel 100 is a substrate for supporting the high-strength transparent cover 130. Therefore, the touch display panel 300 does not require an additional cover glass or a cover plate, and can meet the thin design requirements in thickness. In this embodiment, the display panel 310 may be an organic light emitting display panel, a liquid crystal display panel, an electronic paper display panel, an electrophoretic display panel, an electrowetting display panel, a bistable display panel, or the like.

In summary, in the touch panel of the present invention, a buffer layer is disposed between the transparent cover and the decorative layer to increase the reliability of the decorative layer attached to the transparent cover, and the material of the buffer layer is metal or When the conductive material is used, the setting of the buffer layer is more helpful to improve the electrostatic discharge protection of the touch panel.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art does not deviate. In the spirit and scope of the present invention, the scope of protection of the present invention is defined by the scope of the appended claims.

100‧‧‧ touch panel

102‧‧‧Key area

110‧‧‧Decorative layer

116‧‧‧Decorative opening

120, 220‧‧‧ touch elements

122‧‧‧First sensing series

124‧‧‧Second sensing series

126‧‧‧ transmission line

128A‧‧‧Insulation pattern

128B‧‧‧Protective layer

130‧‧‧Transparent cover

132‧‧‧ first side

134‧‧‧ second side

140‧‧‧buffer layer

142‧‧‧ Buffer opening

228‧‧‧Insulation

228A‧‧‧Contact opening

300‧‧‧Touch display panel

310‧‧‧ display panel

C‧‧‧Board

C1, C2‧‧‧ connection line

D1‧‧‧ first direction

D2‧‧‧ second direction

E1, E2‧‧‧ sensing electrodes

I-I’, II-II”

FIG. 1 is a schematic top plan view of a touch panel according to an embodiment of the invention.

2 is a bottom view of the touch panel of FIG. 1 .

3 is a cross-sectional view of the touch panel of FIGS. 1 and 2 taken along line I-I'.

4 is a cross-sectional view of the touch panel of FIGS. 1 and 2 taken along line II-II'.

FIG. 5 is a cross-sectional view showing a touch element according to another embodiment of the present invention.

FIG. 6 is a schematic diagram of a touch display panel according to an embodiment of the invention.

100‧‧‧ touch panel

102‧‧‧Key area

110‧‧‧Decorative layer

116‧‧‧Decorative opening

120‧‧‧Touch components

126‧‧‧ transmission line

128B‧‧‧Protective layer

130‧‧‧Transparent cover

132‧‧‧ first side

134‧‧‧ second side

140‧‧‧buffer layer

142‧‧‧ Buffer opening

I-I’‧‧‧ line

Claims (10)

A touch panel includes: a transparent cover having a first side and a second side; a buffer layer disposed on the first side of the transparent cover, wherein the buffer layer is made of a metal a material or a ceramic material; a decorative layer disposed on the surface of the buffer layer, wherein a first adhesion between the buffer layer and the transparent cover is greater than a second adhesion between the decorative layer and the transparent cover And a touch component disposed on the second side. The touch panel of claim 1, wherein the decorative layer comprises a ceramic material or a diamond-like material. The touch panel of claim 2, wherein the ceramic material comprises titanium nitride, titanium carbide, titanium carbonitride, titanium aluminum nitride, chromium nitride, chromium carbide, chromium carbonitride, and nitride. Zirconium, zirconium carbonitride, titanium zirconium carbon or a combination thereof. The touch panel of claim 1, wherein the metal material comprises chromium, titanium, tin, aluminum, indium, gallium or a combination thereof. The touch panel of claim 1, wherein the ceramic material comprises titanium nitride, titanium oxynitride, titanium carbonitride, titanium oxide, aluminum nitride, aluminum oxynitride, aluminum oxide, tin oxide, and oxidation. Indium, indium tin oxide or a combination thereof. The touch panel of claim 1, wherein the decorative layer has at least one decorative layer opening, and the touch panel further comprises at least one button area to be disposed in the decorative layer opening. The touch panel of claim 6, wherein the buffer layer has at least one buffer layer opening, and the button region is further disposed in the buffer layer opening. The touch panel of claim 1, wherein the touch element comprises: a plurality of first sensing series, each of the first sensing series extending along a first direction; and a plurality of second senses The second sensing series extends along a second direction, and the first direction is interlaced with the second direction such that the first sensing series and the second sensing series are mutually And a plurality of transmission lines disposed in the first sensing series and the second sensing series, and each of the transmission lines is connected to the first sensing series and the second sensing strings One of the columns. The touch panel of claim 1, wherein the touch element comprises at least one sensing electrode layer and at least one transmission line disposed around the sensing electrode layer. The touch panel of claim 1, wherein the buffer layer is disposed on a periphery of the transparent cover.