TWI497573B - Touch panel and manufacturing method thereof - Google Patents

Description

Touch panel and method of manufacturing same

The present invention relates to a panel and a method of fabricating the same, and more particularly to a touch panel and a method of fabricating the same.

The capacitive touch panel generates a capacitive effect by touching the finger or conductor of the user on the panel, and then the position of the finger or the conductor can be determined by the change of the capacitance value, thereby achieving the purpose of signal input. The substrate of the conventional capacitive touch panel is provided with positive and negative conductive lines. The working principle is that when the user touches two sensing electrodes separated by two, the finger provides a path for the two sensing electrodes to conduct, and the electric energy is used to stimulate the finger. The nerve or muscle tissue reaches the purpose of electrical stimulation tactile feedback. By detecting the change amount of the contact capacitance value of the positive and negative electrodes, the position of the hand touch can be determined separately after being processed by the touch IC, thereby determining the coordinates of the finger touch point on the touch screen. .

A touch panel 10a, as shown in FIG. 1 and FIG. 1A, is made of a dielectric material containing a carbon nanotube, and the conductive layer 103a is different from other powder materials such as ITO conductive materials. The conductive layer component is prepared. The carbon nanotube is a suspension solution formed by slender column material and insoluble in a solvent, and can be made into a negative film totem by using the peelable rubber 102a, and then coated to form a conductive layer 103a. Thereafter, the strippable adhesive 102a is removed to form a conductive layer 103a (male film totem).

However, in the process of peeling off the peelable adhesive 102a, since the conductive layer 103a may adhere to the substrate 101a and the peelable adhesive 102a at the same time, the film-off process needs to destroy the structure of the conductive layer 103a, and the boundary of the conductive layer 103a. 1031a is easy to produce burrs during the peeling process and is poorly formed (burr is turned on) . This undesirable result tends to cause misalignment of the conductive layer 103a or conduction between the cation-positive transparent electrodes. Moreover, the thicker the thickness of the conductive layer 103a, the more severe the burr of the conductive layer 103a will be.

Therefore, the present inventors have felt that the above-mentioned deficiencies can be improved, and they have devoted themselves to research and cooperated with the application of the theory, and finally proposed a present invention which is reasonable in design and effective in improving the above-mentioned defects.

The embodiment of the invention provides a touch panel and a manufacturing method thereof, which help to prevent the conductive layer of the touch panel from forming a burr.

The embodiment of the invention provides a method for manufacturing a touch panel, the method comprising: selecting a transparent carrier, having an inner surface and a touchable outer surface; forming a patterned peelable adhesive layer An inner surface of the carrier, wherein the strippable layer and the inner surface of the carrier define an accommodating space; and the carrier plate on which the strippable layer is formed is at a temperature equal to or higher than a curing temperature of the strippable layer The environment continues for a specific time to expand the strippable layer to form a sacrificial layer, wherein the sacrificial layer and the inner surface of the carrier define a recessed space, the volume of the recessed space being smaller than the volume of the accommodating space And the sacrificial layer abuts the block of the inner surface, and the cross-sectional area thereof gradually increases from the inner surface toward the inner surface; forming a transparent conductive layer in the recessed space, and the The thickness of the conductive layer is smaller than the thickness of the sacrificial layer and adjacent to the inner surface of the carrier and the sacrificial layer; and the sacrificial layer is peeled off from the inner surface of the carrier to obtain the conductive layer formed on the carrier. Touch panel.

Preferably, before forming the conductive layer, preparing a solution having a carbon nanotube and reciprocating the solution in the recessed space to form the solution Conductive layer.

Preferably, after the solution is sprayed on the recessed space, the carrier plate carrying the sacrificial layer and the solution is baked in an environment higher than the curing temperature of the strippable layer to reciprocally spray the recessed space. The solution is fused to form the conductive layer.

Preferably, the solution comprises a conductive polymer and a plurality of carbon nanotubes. When preparing the solution, the conductive polymer and the nanocarbon contained in the solution are prepared according to the transparency and resistance required of the conductive layer. Tube ratio.

Preferably, after the sacrificial layer is formed, the temperature of the carrier is maintained at a temperature slightly lower than the curing temperature of the peelable layer, and the conductive layer is formed on the inner surface of the carrier.

Preferably, the peelable adhesive layer is screen printed on the inner surface of the carrier.

Preferably, when the peelable layer is coated on the inner surface of the carrier, the thickness of the strippable layer is controlled to be between 80 μm and 200 μm.

The embodiment of the present invention further provides a touch panel comprising: a see-through carrier having an inner surface and a touchable outer surface; and a transparent carbon nanotube conductive layer. A specific pattern is formed on an inner surface of the carrier, and a cross-sectional area of the carbon nanotube conductive layer is gradually reduced from a direction adjacent to the inner surface toward the inner surface.

Preferably, the carbon nanotube conductive layer has a top surface unit, a bottom surface unit, and a side unit connecting the top surface unit and the bottom surface unit, wherein the bottom surface unit of the carbon nanotube conductive layer is connected to the load An inner surface of the panel, the side unit being concavely curved and having an arc center on a side of the inner surface away from the outer surface.

Preferably, the carbon nanotube conductive layer comprises a conductive polymer and several a carbon nanotube coated on the conductive polymer.

In summary, the touch panel and the method for fabricating the same according to the embodiments of the present invention are designed to reduce the possibility of burrs on the margin of the conductive layer (the carbon nanotube conductive layer) through the design of the sacrificial layer.

The detailed description of the present invention and the accompanying drawings are to be understood by the claims The scope is subject to any restrictions.

[Preferred embodiment]

Please refer to FIG. 2 to FIG. 6 , which are schematic diagrams of the steps of the embodiment of the present invention. The drawings of the present embodiment are exemplified by a partial area of the touch panel, and thus are not limited thereto.

This embodiment is a method for manufacturing a touch panel, and particularly relates to a method for manufacturing a capacitive touch panel that contributes to the improvement of the burr of the conductive layer. The method includes the following steps: Step S101: As shown in FIG. The see-through carrier 1 has an inner surface 11 and a touch-enabled outer surface 12. The inner surface 11 and the outer surface 12 are exemplified by two planes parallel to each other, but are not limited thereto in practical applications.

In addition, the carrier 1 is exemplified by a surface-hardened polyethylene terephthalate (PET) plate in this embodiment, but it is not limited thereto.

Step S102: As shown in FIG. 3, a patterned peelable adhesive layer 2 is formed on the inner surface 11 of the carrier board 1 so that the peelable adhesive layer 2 and the inside of the carrier board 1 are formed. The surface 11 encloses an accommodating space 21.

Wherein, the peelable adhesive layer 2 is coated with a peelable adhesive (not shown) on the inner surface 11 of the carrier sheet 1 and the thickness of the peelable adhesive layer 2 is controlled between 80 μm and 200 μm. The thickness is preferably between 100 μm and 160 μm.

It should be noted that if the thickness of the peelable adhesive layer 2 is less than 80 μm, the area formed between the peelable adhesive layer 2 and the carrier 1 will be too small (that is, the receiving space 21 is too small), which is disadvantageous for the conventional formation. The improvement of the burr of the conductive layer 4.

However, if the thickness of the peelable adhesive layer 2 is greater than 200 μm, the peelable adhesive beach will be easily flowed, so that the peelable adhesive cannot form the desired patterned peelable adhesive layer 2 on the inner surface 11 of the carrier sheet 1, thereby causing The required accommodation space 21 cannot be defined.

Step S103: As shown in FIG. 4, the carrier sheet 1 on which the above-mentioned strippable layer 2 is formed is kept in an environment having a curing temperature equal to or higher than the strippable layer 2 for a specific time to expand the peelable layer 2 Defined as a sacrificial layer 3.

The sacrificial layer 3 and the inner surface 11 of the carrier 1 define a recessed space 31, and the volume of the recessed space 31 is smaller than the volume of the accommodating space 21.

Specifically, the sacrificial layer 3 abuts on the block of the inner surface 11 of the carrier 1 , and the cross-sectional area parallel to the inner surface 11 gradually increases from the adjacent inner surface 11 toward the inner surface 11 , and the above region The side edges of the block are generally convexly curved. In other words, the cross-sectional area of the recessed space 31 parallel to the inner surface 11 gradually decreases from the adjacent inner surface 11 toward the farther inner surface 11.

In more detail, the carrier 1 on which the above-mentioned peelable layer 2 is formed can be continuously dried for 10 minutes in an environment of approximately 125 ° C to 140 ° C, thereby expanding The sacrificial layer 3 is formed.

Thereafter, the temperature of the carrier 1 is maintained at a temperature slightly lower than the curing temperature of the peelable layer 2 (i.e., maintained at about 100 ° C to 130 ° C) to facilitate the subsequent steps.

Step S104: As shown in FIG. 5, a transparent conductive layer 4 is formed in the recessed space 31, and the thickness of the conductive layer 4 is smaller than the thickness of the sacrificial layer 3 and adjacent to the inner surface 11 of the carrier 1 and the sacrificial layer. 3. In other words, the side edges of the conductive layer 4 are attached to the sacrificial layer 3 to exhibit a concave arc shape.

Wherein, before forming the conductive layer 4, a solution 5 containing a conductive polymer and a carbon nanotube is prepared at room temperature, and when the solution 5 is prepared, the desired transparency and resistance value of the conductive layer 4 are prepared. 5 The ratio of conductive polymer and carbon nanotubes required.

Thereafter, as shown in FIG. 5A, the solution 5 is reciprocally sprayed in the recessed space 31, and the number of times the solution 5 is reciprocally sprayed is determined by the thickness of the wet film to be constructed of the conductive layer 4.

For example, if the wet film thickness of the conductive layer 4 to be constructed is 20 μm to 120 μm, the number of times of reflowing the solution 5 is approximately 4 to 24 times.

Next, the carrier 1 carrying the sacrificial layer 3 and the conductive layer 4 is baked in an environment higher than the curing temperature of the peelable layer 2, so that the solution 5 reciprocally sprayed on the recessed space 31 is fused to form a The conductive layer 4 is described.

In more detail, the carrier 1 carrying the sacrificial layer 3 and the conductive layer 4 can be continuously baked for 20 minutes in an environment of approximately 130 ° C to 160 ° C.

Further, in the above description, the conductive layer 4 is exemplified by the conductive polymer and the carbon nanotube. However, in practical use, the composition of the conductive layer 4 is not limited thereto.

Step S105: As shown in FIG. 6, the sacrificial layer 3 is peeled off from the inner surface 11 of the carrier 1 to obtain the touch panel 100 on which the conductive layer 4 is formed on the carrier 1.

However, since the portion where the sacrificial layer 3 and the conductive layer 4 abut each other does not interfere with each other, when the sacrificial layer 3 is peeled off from the inner surface 11 of the carrier 1, the burr is not damaged by the conductive layer 4.

Thereby, the touch panel 100 obtained by the above steps (ie, the carrier 1 having the conductive layer 4 formed in step S105) is implemented, and in the process of peeling off the film by the sacrificial layer 3, the generation of the burrs of the boundary of the conductive layer 4 can be effectively prevented. Thereby, the structure of the conductive layer 4 is kept flat.

Specifically, if the touch panel 100 is actually tested, the relevant data can be obtained as follows:

Furthermore, the specific structural features of the touch panel 100 manufactured through the above steps S101 to S105 will be roughly described below. In the above description, the conductive layer 4 is exemplified by a carbon nanotube conductive layer 4 including a conductive polymer and a plurality of carbon nanotubes coated on the conductive polymer, but is not limited thereto.

Referring to FIG. 6 and FIG. 6A , the touch panel 100 includes a transparent carrier 1 and a transparent carbon nanotube conductive layer 4 . The carrier board 1 has an opposite inner surface 11 and a touch-sensitive outer surface 12.

The carbon nanotube conductive layer 4 is formed on the inner surface 11 of the carrier 1 in a specific pattern, and the cross-sectional area of the carbon nanotube conductive layer 4 parallel to the inner surface 11 from the adjacent inner surface 11 toward the inner surface 11 The direction is gradually narrowing.

In more detail, the carbon nanotube conductive layer 4 has a top surface unit 41, a bottom surface unit 42, and a side unit 43 connecting the top surface unit 41 and the bottom surface unit 42. The bottom unit 42 of the carbon nanotube conductive layer 4 is connected to the inner surface 11 of the carrier 1, and the side unit 43 has a concave arc shape and its arc center is located on the side of the inner surface 11 away from the outer surface 12.

In other words, the tangential slope of the side unit 43 gradually increases from a portion adjacent to the inner surface 11 of the carrier 1 toward a portion away from the inner surface 11, and a portion where the side unit 43 is connected to the top unit 41 defines a ratio greater than or equal to The angle of 90 degrees.

[Possible effects of the examples]

According to an embodiment of the invention, the touch panel and the method of manufacturing the same described above help to avoid generation of burrs at the boundary of the conductive layer. Furthermore, it can be seen from the actual test data that the manufacturing method of the touch panel described in this embodiment can effectively reduce the generation of the burrs of the conductive layer, even if the thickness of the conductive layer is thick.

The above description is only an embodiment of the present invention, and is not intended to limit the scope of the invention.

[study]

10a‧‧‧Touch panel

101a‧‧‧Substrate

102a‧‧‧ peelable glue

103a‧‧‧ Conductive layer

1031a‧‧‧ Conductive layer boundary

〔this invention〕

100‧‧‧ touch panel

1‧‧‧ Carrier Board

11‧‧‧ inner surface

12‧‧‧ outer surface

2‧‧‧ peelable layer

21‧‧‧ accommodating space

3‧‧‧ Sacrifice layer

31‧‧‧ recessed space

4‧‧‧ Conductive layer (nano carbon tube conductive layer)

41‧‧‧Top unit

42‧‧‧ bottom unit

43‧‧‧Side unit

5‧‧‧solution

1 is a schematic structural view of a conventional touch panel forming conductive layer; FIG. 1A is an enlarged schematic view of a block A of FIG. 1; FIG. 2 is a schematic flowchart of step S101 of a method for manufacturing a touch panel according to the present invention; FIG. 4 is a schematic flowchart of a step S103 of a method for manufacturing a touch panel according to the present invention; FIG. 5 is a schematic flowchart of a step S104 of a method for manufacturing a touch panel according to the present invention; FIG. 6 is a schematic flow chart of the step S105 of the manufacturing method of the touch panel of the present invention; and FIG. 6A is an enlarged schematic view of the block B of FIG. 6 .

1‧‧‧ Carrier Board

11‧‧‧ inner surface

12‧‧‧ outer surface

3‧‧‧ Sacrifice layer

4‧‧‧ Conductive layer (nano carbon tube conductive layer)

Claims (10)

A method for manufacturing a touch panel, the method comprising: selecting a see-through carrier having an inner surface and a touch-enabled outer surface; forming a patterned strippable layer in the carrier a surface, wherein the peelable adhesive layer surrounds an inner surface of the carrier plate to define an accommodating space; and the carrier plate on which the peelable adhesive layer is formed is continued in a specific environment equal to or higher than a curing temperature of the peelable adhesive layer Time, in order to expand the strippable layer, is defined as a sacrificial layer, wherein the sacrificial layer encloses an inner surface of the carrier plate to define a recessed space, the volume of the recessed space is smaller than the volume of the receiving space, and The sacrificial layer abuts the block of the inner surface, and the cross-sectional area thereof gradually increases from the inner surface toward the inner surface; forming a transparent conductive layer in the recessed space, and the conductive layer a thickness less than the thickness of the sacrificial layer and adjacent to the inner surface of the carrier and the sacrificial layer; and peeling the sacrificial layer from the inner surface of the carrier to obtain a specific pattern formed on the carrier Conductive layer touch panel The method for manufacturing a touch panel according to claim 1, wherein before forming the conductive layer, preparing a solution having a carbon nanotube and reciprocating the solution in the recessed space to form the Conductive layer. The method for manufacturing a touch panel according to claim 2, wherein after the solution is sprayed on the recessed space, the carrier plate carrying the sacrificial layer and the solution is higher than the curing temperature of the peelable layer. Bake in an environment to fuse the solution reciprocally sprayed in the recessed space to form the conductive layer . The method for manufacturing a touch panel according to claim 2, wherein the solution comprises a conductive polymer and a plurality of carbon nanotubes, and the transparency and resistance required for the conductive layer are prepared when the solution is prepared. The ratio of the conductive polymer and the carbon nanotubes required to prepare the solution. The method for manufacturing a touch panel according to claim 1, wherein after the sacrificial layer is formed, the temperature of the carrier is kept slightly lower than a curing temperature of the peelable layer, and the conductive layer is formed. On the inner surface of the carrier. The method of manufacturing a touch panel according to claim 1, wherein the peelable adhesive layer is overprinted on the inner surface of the carrier. The method for manufacturing a touch panel according to claim 1, wherein the peelable layer is controlled to have a thickness of between 80 μm and 200 μm when the peelable layer is coated on the inner surface of the carrier. . A touch panel is formed by the method of manufacturing the touch panel of claim 1, the touch panel comprising: the see-through carrier having the inner surface and the touchable outer surface; And the transparent conductive layer is formed on the inner surface of the carrier in the specific pattern, and the cross-sectional area of the conductive layer is gradually reduced from a direction adjacent to the inner surface away from the inner surface. The touch panel of claim 8, wherein the conductive layer is further defined as a carbon nanotube conductive layer, the carbon nanotube conductive layer has a top unit, a bottom unit, and the top a surface unit and a side unit of the bottom unit, wherein a bottom unit of the carbon nanotube conductive layer is connected to an inner surface of the carrier, and the side unit has a concave arc shape and The arc center is located on a side of the inner surface away from the outer surface. The touch panel of claim 9, wherein the tangential slope of the side unit gradually increases from a portion adjacent to the inner surface toward a portion away from the inner surface.