TW201710855A - Touch panel and method for fabricating the same - Google Patents

Abstract

A touch panel includes a substrate, a decoration layer, a shielding layer, and a dielectric layer. The substrate includes a visible area and a non-visible area disposed at least one side of the visible area. The decoration layer is disposed on the substrate for defining the visible area and the non-visible area. The shielding layer covers a first portion of the decoration layer, and exposes a second portion of the decoration layer. The first portion and the second portion of the decoration layer are connected, and the second portion is closer to the visible area than the first portion is. The dielectric layer covers the second portion of the decoration layer.

Description

Touch panel and manufacturing method thereof

The present invention relates to a touch panel.

With the development of smart products such as smart phones, monitors with touch panels have gradually become mainstream. In order to enable the user to use the smart product without being affected by the circuit of the touch panel, the cover glass of the touch panel is usually provided with a decorative layer and a light shielding layer stacked on each other, and the decorative layer is, for example, ink of various colors. In order to make the touch panel display a frame of various colors, the light shielding layer is an opaque material to block the reflection of visible elements such as metal.

The multiple layers of the touch panel, such as the decorative layer and the light shielding layer, often have a mismatched thermal expansion coefficient, so that the layer with a large thermal expansion coefficient may have a coefficient of thermal expansion during the manufacturing process due to inconsistent expansion and contraction rates. The smaller layer is pulled and the layer having a smaller coefficient of thermal expansion is cracked. Some of the circuits of the touch panel may be disposed on the layers, and the crack may cause the circuits to be broken, thereby causing the touch effect to be unsuccessful.

In various embodiments of the present invention, the decorative layer is covered by the insulating layer to prevent the circuit of the touch panel from being directly disposed on the decorative layer. In this way, even if the decorative layer is cracked before the formation of the insulating layer, a crack can be filled in the process of forming the insulating layer by filling the liquid insulating material to provide a flat surface. In addition, since the insulating layer has a smaller expansion coefficient than the decorative layer, on the one hand, the expansion of the decorative layer and the light shielding layer can be suppressed, and the thermal expansion and contraction of the light shielding layer is reduced to generate a large stress to cause cracks in the decorative layer; In respect, the insulating layer itself has a small coefficient of thermal expansion, so that the stress generated by the thermal expansion and contraction has less influence on the decorative layer, and the possibility that the decorative layer is cracked in the subsequent baking and the like can be reduced.

One aspect of the present invention provides a touch panel including a substrate, a decorative layer, a light shielding layer, and an insulating layer. The substrate includes a viewable area and a non-visible area disposed on at least one side of the viewable area. The decorative layer is disposed on the substrate and is used to define the visible area and the non-visible area. The light shielding layer covers the first portion of the decorative layer and exposes the second portion of the decorative layer, wherein the first portion of the decorative layer is adjacent to the second portion and the second portion is closer to the viewable region than the first portion. An insulating layer covers the second portion of the decorative layer.

In one or more embodiments of the invention, the insulating layer extends over the light shielding layer and at least partially covers the light shielding layer.

In one or more embodiments of the present invention, the touch panel further includes a touch sensing layer and at least one conductive lead connected to the touch sensing array. The touch sensing layer includes a touch sensing array and at least one peripheral lead, wherein the touch sensing array is disposed in the visible area, and the peripheral lead is disposed in the non-visible area and located in the insulating layer on. Conductive leads are disposed in the non-visible area and above the insulating layer for connecting the peripheral leads.

In one or more embodiments of the present invention, the touch panel further includes a touch sensing layer and at least one conductive lead connected to the touch sensing array. The touch sensing layer includes a touch sensing array and at least one peripheral lead, wherein the touch sensing array is disposed in the visible area, and the peripheral lead is disposed in the non-visible area and above the insulating layer. The conductive lead is disposed between the insulating layer and the light shielding layer, and the insulating layer includes at least one conductive via to electrically connect the conductive lead to the peripheral lead.

In one or more embodiments of the invention, the second portion extends from the adjacent interface of the first portion to the second portion to the viewable region by between about 10 microns and about 200 microns.

In one or more embodiments of the invention, the coefficient of expansion of the insulating layer is less than the coefficient of expansion of the decorative layer.

In one or more embodiments of the invention, the coefficient of expansion of the decorative layer is less than the coefficient of expansion of the light shielding layer.

In one or more embodiments of the present invention, the decorative layer further includes a third portion of the adjacent second portion, wherein the third portion is closer to the viewable region than the second portion, and the third portion is not subjected to the insulating layer Covered and exposed.

One aspect of the present invention provides a method of manufacturing a touch panel, comprising forming a decorative layer on a substrate, wherein the decorative layer defines a visible area of the substrate and a non-visible area disposed on at least one side of the visible area; forming a light shielding layer in the decoration a first portion of the layer to expose a second portion of the decorative layer adjacent to the viewable area, wherein the second portion The portion is closer to the visible region than the first portion, the first portion is adjacent to the second portion; and an insulating layer is formed to connect the light shielding layer and cover the second portion of the decorative layer.

In one or more embodiments of the present invention, the step of forming the insulating layer includes: coating a liquid material on the second portion of the decorative layer to fill the recess of the decorative layer; and baking the substrate to The liquid material is hardened to form an insulating layer.

In one or more embodiments of the invention, the insulating layer extends over the light shielding layer and at least partially covers the light shielding layer.

In one or more embodiments of the present invention, the method for manufacturing a touch panel further includes forming at least one peripheral lead of the touch sensing layer over the insulating layer of the non-visible area; and forming at least one conductive lead Above the insulating layer of the non-visible area, wherein the peripheral leads are connected to the conductive leads.

In one or more embodiments of the present invention, the method for manufacturing a touch panel further includes forming at least one conductive lead over the light shielding layer before forming the insulating layer; and forming at least the insulating layer after forming the insulating layer a conductive via is formed in the insulating layer; and at least one peripheral lead of the touch sensing layer is formed on the conductive via, such that the conductive lead is electrically connected to the peripheral lead through the conductive via.

In one or more embodiments of the invention, the coefficient of expansion of the insulating layer is less than the coefficient of expansion of the decorative layer.

100‧‧‧ touch panel

110‧‧‧Substrate

120‧‧‧decorative layer

122‧‧‧Part 1

124‧‧‧Part II

126‧‧‧Part III

130‧‧‧Lighting layer

132‧‧‧ side

140‧‧‧Insulation

142‧‧‧ conductive through holes

150‧‧‧ touch sensing layer

152‧‧‧Touch Sensing Array

154‧‧‧ peripheral leads

160‧‧‧Electrical leads

VA‧‧ visible area

NA‧‧‧Invisible area

B-B’‧‧‧ line

D‧‧‧ dotted line

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

Fig. 1B is a cross-sectional view taken along line B-B' of Fig. 1A.

2 is a cross-sectional view of a touch panel according to another embodiment of the present invention.

3 is a cross-sectional view of a touch panel according to still another embodiment of the present invention.

4 is a cross-sectional view of a touch panel according to still another embodiment of the present invention.

5A to 5E are cross-sectional views showing a touch panel according to still another embodiment of the present invention in a plurality of fabrication steps.

6A to 6C are cross-sectional views showing a touch panel according to another embodiment of the present invention in a plurality of fabrication steps.

The various embodiments of the present invention are disclosed in the drawings, and in the claims However, it should be understood that these practical details are not intended to limit the invention. That is, in some embodiments of the invention, these practical details are not necessary. In addition, some of the conventional structures and elements are shown in the drawings in a simplified manner.

Refer to both Figure 1A and Figure 1B. FIG. 1A is a top view of a touch panel 100 according to an embodiment of the present invention. Fig. 1B is a cross-sectional view taken along line B-B' of Fig. 1A. The touch panel 100 includes a substrate 110 , a decorative layer 120 , a light shielding layer 130 , and an insulating layer 140 . In FIG. 1A, for convenience of explanation, the boundary of the light shielding layer 130 is indicated by a broken line D, and the light shielding layer 130 is not actually shown or labeled. The substrate 110 includes a visible area VA and a non-visible area NA disposed on at least one side of the visible area VA. In this embodiment, the non-visible area NA surrounds the periphery of the visible area VA as an example. The decorative layer 120 is disposed on the substrate 110 and is used to define the visible area VA and The non-visible area NA, the decorative layer 120 is located in the non-visible area NA. Referring to FIG. 1B, the light shielding layer 130 covers the first portion 122 of the decorative layer 120, and exposes the second portion 124 of the decorative layer 120 to avoid extending the decorative layer 120 to the visible region VA due to process precision and the like, resulting in user self- The light-shielding layer 130 can be seen in the visible area VA to affect the visual effect. The first portion 122 of the decorative layer 120 is adjacent to the second portion 124, and the second portion 124 is closer to the viewable area VA than the first portion 122. The insulating layer 140 is provided with at least a contact light shielding layer 130 and covering the second portion 124 of the decorative layer 120.

In the embodiment, the touch panel 100 further includes a touch sensing layer 150 and at least one conductive lead 160 . The touch sensing layer 150 is disposed on the visible layer VA and partially extends to the non-visible area NA to be disposed on the decorative layer 120 and the light shielding layer 130. The specific touch sensing layer 150 is also located in the insulating layer 140. And electrically connected to the conductive lead 160. The conductive lead 160 can be disposed on the decorative layer 120 and the light shielding layer 130. The touch sensing layer 150 is configured to detect the touch information and transmit the touch information to the computing unit (not shown) through the conductive lead 160. For example, an integrated circuit chip, the calculation unit calculates the touch position of the user.

Here, in the process of arranging the light shielding layer 130, a step of heating baking or the like is required. Since the decorative layer 120 and the light shielding layer 130 do not have the same thermal expansion coefficient, there may be a difference in expansion therebetween. For example, when the decorative layer 120 is composed of white ink and the light shielding layer 130 is composed of black ink, the thermal expansion coefficient of the light shielding layer 130 is greater than the thermal expansion coefficient of the decorative layer 120. In particular, for the partial decorative layer 120 covered by the light shielding layer 130, that is, the second portion 124 of the decorative layer 120, the difference in expansion between the light shielding layer 130 and the decorative layer 120 may produce a lateral response. The force will pull the decorative layer 120, and the formed decorative layer 120 is easily cracked.

Here, for convenience of explanation, the decorative layer 120 is divided into three parts that are sequentially connected: a first part 122, a second part 124, and a third part 126. The first portion 122 is covered by the light shielding layer 130, and the second portion 124 refers to a portion of the decorative layer 120 which is relatively easy to be cracked near the light shielding layer 130 during the heating baking, and the third portion 126 refers to being away from the light shielding layer 130 during the heating baking. A portion of the decorative layer 120 that is less prone to cracking. The boundary between the second portion 124 and the third portion 126 varies depending on the material difference between the substrate 110, the decorative layer 120, and the light shielding layer 130 used and the baking temperature. For example, in various embodiments, the second portion 124 extends from the adjacent interface of the first portion 122 and the second portion 124 to the viewable region VA by between about 10 microns and about 200 microns. It should be noted that, in other embodiments, according to the relative size design of the light shielding layer 130 and the decorative layer 120, it is possible that the decorative layer 120 is only divided into the first portion 122 and the second portion 124 without the remaining third portion. 126. Thus, the side of the insulating layer 140 near the visible area VA is substantially flush with the side of the decorative layer 120 adjacent to the visible area VA, or the insulating layer 140 may further extend to the visible area VA.

In various embodiments of the present invention, the insulating layer 140 is disposed at a portion of the decorative layer 120 that is covered by the light shielding layer 130 (ie, the second portion 124), and the insulating coefficient of the insulating layer 140 is designed to be smaller than the expansion coefficient of the decorative layer 120. In detail, the insulating layer 140 is designed to cover an area extending from the adjacent interface of the first portion 122 and the second portion 124 to the viewable region VA by about 10 microns to about 200 microns. On the one hand, the crack generated by the crack of the decorative layer 120 caused by the baking or the like may be filled in the previously made light shielding layer 130 to provide the subsequently formed touch sensing layer 150. Or a flat surface of the conductive lead 160 to avoid an open circuit; on the other hand, in the subsequent process of manufacturing the light shielding layer 130, the expansion of the decorative layer 120 is suppressed by the insulating layer 140, and the thermal expansion and contraction of the light shielding layer 130 is reduced to be large. The stress causes the decorative layer 120 to crack; in addition, the insulating layer 140 itself has a small coefficient of thermal expansion, so the stress generated by the thermal expansion and contraction has less influence on the decorative layer 120 and the light shielding layer 130, and the decorative layer 120 is prevented from being partially protected. Cracked. Herein, the thermal expansion coefficients of the insulating layer 140, the decorative layer 120, and the light shielding layer 130 may be sequentially increased to reduce the influence of the expansion and contraction of the light shielding layer 130 on the decorative layer 120.

Although only the second portion 124 is covered by the insulating layer 140, the third portion 126 is closer to the visible region VA than the second portion 124, and the third portion 126 is not exposed by the insulating layer 140, However, the scope of the invention should not be limited thereby. In some embodiments, the insulating layer 140 may also extend onto the third portion 126. However, it should be understood that, in order to prevent the user from observing the configuration of the insulating layer 140, the insulating layer 140 may be prevented from extending to the visible region VA, so that the portion of the third portion 126 may not be covered by the insulating layer 140, or The side of the insulating layer 140 near the visible area VA is made flush with the side of the decorative layer 120 near the visible area VA.

In the present embodiment, the insulating layer 140 may extend onto the light shielding layer 130 and at least partially cover the light shielding layer 130. Here, as shown, the insulating layer 140 may completely cover the light shielding layer 130. The touch sensing layer 150 includes a touch sensing array 152 and at least one peripheral lead 154 connected to the touch sensing array 152 , wherein the peripheral leads 154 are directly connected to the conductive leads 160 and are located above the insulating layer 140 . The touch sensing array 152 is disposed in the visible area VA, and the peripheral lead 154 and the conductive lead 160 are disposed in the non-visible area NA, wherein the conductive lead 160 is disposed in the light blocking area. Above layer 130. Conductive lead 160 can be formed from a metal or other electrically conductive material. The light shielding layer 130 is disposed to shield the reflective light of the conductive lead 160 from affecting the visual effect.

In this embodiment, the substrate 110 may be composed of a transparent material, and the substrate 110 may be a rigid substrate or a flexible substrate. The substrate 110 may be made of glass, poly(methyl methacrylate), PMMA, polycarbonate (PC), polyethylene terephthalate (PET), polyvinyl chloride (polyvinyl terephthalate). Polyvinyl chloride; PVC), a combination of the above or other materials. The other surface of the substrate 110 opposite to the decorative layer 120 is a surface that provides a user's touch operation, which is closer to the surface of the user.

In some embodiments, the light shielding layer 130 may be formed of an opaque material, such as a black photoresist, to shield the reflected light. The material of the decorative layer 120 may be one or a combination of acryl, epoxy or ruthenium, wherein the dye may be doped to have a specific color. For example, the decorative layer 120 can be formed from a white ink.

In the present embodiment, the insulating layer 140 may be composed of an insulating material such as cerium oxide or polyimide. The material of the conductive lead 160 may be a metal having a preferable electrical conductivity such as silver, copper or the like. The material of the touch sensing layer 150 may be a transparent conductive material such as Indium Tin Oxide (ITO) or aluminum-doped zinc oxide (Al-doped ZnO; AZO). The touch sensing layer 150 can be formed by depositing a transparent conductive material on the surface of the substrate 110 and then performing a patterning process. The detailed patterning process involves multiple steps such as photoresist coating, exposure development, etching, high temperature baking, and the like.

As described above, in the process of forming the light shielding layer 130 or the touch sensing layer 150, the high temperature baking may cause the decorative layer 120 to cause cracks such as cracks and the like, and the subsequently formed peripheral leads 154 may be broken. In the present embodiment, the crack of the decorative layer 120 can be filled by the arrangement of the insulating layer 140, and the possibility of cracks in the subsequent baking step can be reduced.

2 is a cross-sectional view of a touch panel 100 according to another embodiment of the present invention. The embodiment is similar to the embodiment of FIG. 1B . The difference is that in the embodiment, the conductive lead 160 is formed on the light shielding layer 130 , and then the insulating layer 140 is formed to cover the conductive lead 160 , and the insulating layer 140 includes at least one. The conductive vias 142, the peripheral leads 154 and the conductive leads 160 are electrically connected through the conductive vias 142, and the peripheral leads 154 are directly connected to the conductive leads 160 in an embodiment different from that of FIG. 1B.

In detail, the peripheral lead 154 is disposed on the non-visible area NA and above the insulating layer 140. The conductive lead 160 is disposed in the non-visible area NA and between the insulating layer 140 and the light shielding layer 130. The insulating layer 140 may be formed by etching or the like, and the opening communicates with the upper surface and the lower surface of the insulating layer 140, and then a conductive material such as iron, copper, titanium or silver is filled in the opening to form the conductive via 142. . The peripheral leads 154 and the conductive leads 160 are respectively disposed on the upper surface and the lower surface of the insulating layer 140, and are electrically connected through the conductive vias 142.

In this embodiment, the conductive lead 160 is disposed between the insulating layer 140 and the light shielding layer 130, which can reduce the conductive lead 160 to be subjected to an acid-base solution or other liquid or gas during the subsequent process, such as forming the touch sensing layer 150. Corrosion, which in turn increases the reliability of the conductive leads 160. Other details of the present embodiment are substantially similar to the embodiment of FIG. 1B and will not be described herein.

FIG. 3 is a cross-sectional view of a touch panel 100 according to still another embodiment of the present invention. For convenience of description, the touch sensing layer 150 and the conductive lead 160 are not shown here, but it should be understood that the conductive lead 160 may be disposed on the light shielding layer 130 or on the insulating layer 140 and the light shielding layer 130. . This embodiment is similar to the embodiment of FIG. 1B except that in the present embodiment, the insulating layer 140 partially covers only the light shielding layer 130, and the partial light shielding layer 130 is exposed.

Similarly, the insulating layer 140 covers the portion of the decorative layer 120 that is more susceptible to cracking, that is, the second portion 124. On the one hand, the crack generated by the crack of the decorative layer 120 can be filled to provide a flat surface for the subsequent process to avoid the open circuit; on the other hand, the expansion of the decorative layer 120 can be suppressed by the insulating layer 140 in the subsequent process. Other details of the present embodiment are substantially similar to the embodiment of FIG. 1B and will not be described herein.

4 is a cross-sectional view of a touch panel 100 according to still another embodiment of the present invention. For convenience of description, the touch sensing layer 150 and the conductive leads 160 are not shown here. This embodiment is similar to the embodiment of FIG. 1B except that in the present embodiment, the insulating layer 140 contacts only the side surface 132 of the light shielding layer 130 without covering the light shielding layer 130, and the light shielding layer 130 is completely exposed.

Similarly, the insulating layer 140 covers the portion of the decorative layer 120 that is more susceptible to cracking, that is, the second portion 124. On the one hand, the crack generated by the crack of the decorative layer 120 can be filled to provide a flat surface for the subsequent process to avoid the open circuit; on the other hand, the expansion of the decorative layer 120 can be suppressed by the insulating layer 140 in the subsequent process. Other details of the present embodiment are substantially similar to the embodiment of FIG. 1B and will not be described herein.

5A to 5D are cross-sectional views showing a touch panel according to still another embodiment of the present invention in a plurality of fabrication steps. One embodiment of the present invention provides a method of manufacturing a touch panel, which is described below in conjunction with FIGS. 5A-5D.

First, referring to FIG. 5A, a decorative layer 120 is formed on the substrate 110, wherein the decorative layer 120 defines a visible area VA of the substrate 110 and a non-visible area NA disposed on at least one side of the visible area VA. Here, a liquid material (for example, a white ink) may be applied to a peripheral region of the substrate 110 by screen printing or the like, and the substrate 110 may be baked to cure the liquid material to form the decorative layer 120.

Next, referring to FIG. 5B, the light shielding layer 130 is formed on the first portion 122 of the decorative layer 120 away from the visible area VA, and the decorative layer 120 partially exposed to the visible area VA is exposed to prevent the user from easily observing the light shielding layer 130. The light shielding layer 130 may be formed by coating a liquid material on the first portion 122 of the decorative layer 120 and baking the substrate 110 to cure the liquid material. However, since the expansion coefficients of the substrate 110, the decorative layer 120, and the light shielding layer 130 are different, in the baking step described above, a part of the decorative layer 120 not covered by the light shielding layer 130 may be cracked to generate a plurality of depressions. Not conducive to the subsequent process.

Here, as described above, for convenience of explanation, different regions of the decorative layer 120 are defined by the first portion 122, the second portion 124, and the third portion 126, respectively. The first portion 122 is covered by the light shielding layer 130, and the second portion 124 refers to a portion of the decorative layer 120 which is relatively easy to be cracked near the light shielding layer 130 during the heating baking, and the third portion 126 refers to being away from the light shielding layer 130 during the heating baking. A portion of the decorative layer 120 that is less prone to cracking. After the light shielding layer 130, the second portion 124 may create a plurality of depressions.

Referring to FIG. 5C, in the present embodiment, the insulating layer 140 is formed after the light shielding layer 130 is formed and before the touch sensing layer 150 is formed (refer to FIG. 5D). The coefficient of expansion of the insulating layer 140 is smaller than the coefficient of expansion of the decorative layer 120. The insulating layer 140 contacts at least the light shielding layer 130 and at least covers the second portion 124 of the decorative layer 120.

Herein, the liquid insulating material may be applied to the second portion 124 of the decorative layer 120 to fill the recess of the decorative layer 120 with the liquid insulating material; and the substrate 110 is baked to harden the liquid insulating material to form the insulating layer 140. . In this way, a flat surface can be provided for the subsequent process without affecting the subsequent process due to the depression of the decorative layer 120.

In some embodiments, the insulating layer 140 may extend onto the light shielding layer 130 and at least partially cover the light shielding layer 130. Of course, the present invention is not limited thereto. In practical applications, the insulating layer 140 may only contact the side surface 132 of the light shielding layer 130 without covering the light shielding layer 130.

Referring to FIG. 5D, the touch sensing array 152 is formed in the visible area VA, and at least one peripheral lead 154 is formed on the insulating layer 140 of the non-visible area NA to electrically connect the touch sensing array 152. The touch sensing array 152 and the peripheral leads 154 can be formed by depositing a transparent conductive material on the surface of the substrate 110 and forming the touch sensing layer 150 by a patterning process. The detailed patterning process involves multiple steps such as photoresist coating, exposure development, etching, high temperature baking, and the like.

Referring to FIG. 5E, at least one conductive lead 160 is formed over the insulating layer 140 of the non-visible area NA, wherein the peripheral lead 154 is connected to the conductive lead The touch sensing information is transmitted to a computing unit (not shown), such as an integrated circuit chip, and the computing unit calculates the touch position of the user.

The above provides a method of fabricating a touch panel, but should not limit the scope of the invention. In addition to the above-mentioned partial steps, additional steps may be added, and the scope of the invention should not be limited by the above steps. For example, in some embodiments, the conductive leads 160 can be configured to have different electrical connections to the perimeter leads 154, as described below.

6A to 6C are cross-sectional views showing a touch panel according to another embodiment of the present invention in a plurality of fabrication steps. 6A to 6C can be continued after the aforementioned FIG. 5B.

In detail, referring to FIG. 6A, conductive leads 160 may be formed over the light shielding layer 130 after the light shielding layer 130 is formed on the decorative layer 120 (ie, after FIG. 5B).

Next, referring to FIG. 6B, an insulating layer 140 is formed to cover the second portion 124 of the decorative layer 120, the light shielding layer 130, and at least a portion of the conductive leads 160 corresponding to the first portion 122 of the decorative layer 120. Here, the conductive vias 142 may be formed in the insulating layer 140 by etching or the like. The conductive vias 142 are disposed corresponding to the conductive leads 160. In detail, the insulating layer 140 may be formed by etching or the like, and then filled with a conductive material such as iron, copper, titanium or silver in the opening to form the conductive via 142.

Then, referring to FIG. 6C, a touch sensing layer 150 having a touch sensing array 152 and a peripheral lead 154 is formed. The peripheral lead 154 is disposed on the conductive via 142 to electrically pass the conductive lead 160 through the conductive via 142. The peripheral lead 154 is connected sexually. Similarly, the touch sensing layer 150 can include multiple steps. Formed by a patterning process such as photoresist coating, exposure development, etching, high temperature baking, and the like.

As such, in various embodiments of the present invention, the insulating layer 140 can be electrically connected to the peripheral lead 154 and the conductive lead 160 through the conductive via 142. Other details of the present embodiment are substantially as described in the foregoing embodiments, and are not described herein again.

In various embodiments of the present invention, the decorative layer is covered by the insulating layer to prevent the circuit of the touch panel from being directly disposed on the decorative layer. In this way, even if the decorative layer is cracked before the formation of the insulating layer, a crack can be filled in the process of forming the insulating layer by filling the liquid insulating material to provide a flat surface. In addition, since the insulating layer has a smaller expansion coefficient than the decorative layer, on the one hand, the expansion of the decorative layer and the light shielding layer can be suppressed, and the thermal expansion and contraction of the light shielding layer is reduced to generate a large stress to cause cracks in the decorative layer; In respect, the insulating layer itself has a small coefficient of thermal expansion, so that the stress generated by the thermal expansion and contraction has less influence on the decorative layer, and the possibility that the decorative layer is cracked in the subsequent baking and the like can be reduced.

While the invention has been described above in terms of various embodiments, it is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application attached.

100‧‧‧ touch panel

110‧‧‧Substrate

120‧‧‧decorative layer

122‧‧‧Part 1

124‧‧‧Part II

126‧‧‧Part III

130‧‧‧Lighting layer

140‧‧‧Insulation

150‧‧‧ touch sensing layer

152‧‧‧Touch Sensing Array

154‧‧‧ peripheral leads

160‧‧‧Electrical leads

VA‧‧ visible area

NA‧‧‧Invisible area

Claims (14)

A touch panel comprising: a substrate comprising a visible area and a non-visible area disposed on at least one side of the visible area; a decorative layer disposed on the substrate for defining the visible area and the non-visible area a light shielding layer covering a first portion of the decorative layer and exposing a second portion of the decorative layer, wherein the first portion of the decorative layer is adjacent to the second portion, and the second portion is compared to the second portion The first portion is closer to the viewable area; and an insulating layer covers the second portion of the decorative layer. The touch panel of claim 1, wherein the insulating layer extends onto the light shielding layer and at least partially covers the light shielding layer. The touch panel of claim 2, further comprising: a touch sensing layer comprising a touch sensing array and at least one peripheral lead connected to the touch sensing array, wherein the touch sensing array The peripheral lead is disposed on the non-visible area and located on the insulating layer; and at least one conductive lead is disposed on the non-visible area and above the insulating layer for connecting the peripheral lead. The touch panel as claimed in claim 2, further comprising: A touch sensing layer includes a touch sensing array and at least one peripheral lead connected to the touch sensing array, wherein the touch sensing array is disposed in the visible area, and the peripheral lead is disposed in the non-visible area And being disposed on the insulating layer; and at least one conductive lead disposed between the insulating layer and the light shielding layer, wherein the insulating layer comprises at least one conductive via to make the conductive lead and the peripheral lead Electrical connection. The touch panel of claim 1, wherein the second portion extends from the adjacent interface of the first portion and the second portion to the visible region by 10 micrometers to 200 micrometers. The touch panel of claim 1, wherein the insulating layer has a coefficient of expansion that is smaller than a coefficient of expansion of the decorative layer. The touch panel of claim 1, wherein the decorative layer has a coefficient of expansion that is smaller than a coefficient of expansion of the light shielding layer. The touch panel of claim 1, wherein the decorative layer further comprises a third portion adjacent to the second portion, wherein the third portion is closer to the visible region than the second portion, and the The three portions are not exposed by the covering of the insulating layer. A method of manufacturing a touch panel, comprising: Forming a decorative layer on a substrate, wherein the decorative layer defines a visible area of the substrate and a non-visible area disposed on at least one side of the visible area; forming a light shielding layer on a first portion of the decorative layer, Exposing a second portion of the decorative layer adjacent to the viewing zone, wherein the second portion is closer to the viewing zone than the first portion, the first portion is adjacent to the second portion; and forming an insulating layer, Covering the second portion of the decorative layer. The method of manufacturing a touch panel according to claim 9, wherein the forming the insulating layer comprises: coating a liquid material on the second portion of the decorative layer; and baking the substrate to harden the liquid material The insulating layer is formed. The method of manufacturing a touch panel according to claim 9, wherein the insulating layer extends onto the light shielding layer and at least partially covers the light shielding layer. The method for manufacturing a touch panel according to claim 9 or 11, further comprising: forming at least one peripheral lead of a touch sensing layer over the insulating layer of the non-visible area; and forming at least one conductive lead to the non-visible layer Above the insulating layer of the visible region, wherein the peripheral leads connect the conductive leads. The method for manufacturing a touch panel according to claim 11, further comprising: Forming at least one conductive lead on the light shielding layer before forming the insulating layer; forming at least one conductive via in the insulating layer after forming the insulating layer; and forming at least one periphery of a touch sensing layer A lead is over the conductive via such that the conductive lead is electrically connected to the peripheral lead through the conductive via. The method of manufacturing a touch panel according to claim 9, wherein the insulating layer has a coefficient of expansion smaller than a coefficient of expansion of the decorative layer.