CN101556389A - Transparent capacitive touch panel - Google Patents

Abstract

A transparent capacitive touch panel comprises a transparent substrate, a transparent covering plate and a transparent bonding layer, wherein a first transparent electrode layer and a second transparent electrode layer are respectively arranged on the surfaces of the transparent covering plate and the transparent substrate, and the transparent bonding layer is used for bonding the first transparent electrode layer and the second transparent electrode layer so as to combine the transparent substrate and the transparent covering plate which are arranged in parallel, so that the process of the transparent capacitive touch panel is simplified, and the manufacturing cost is reduced.

Description

Transparent capacitive touch panel

technical field

The present invention relates to a touch panel, and in particular to a transparent capacitive touch panel.

Background technique

With the progress of the times, electronic products with touch input functions such as Personal Digital Assistant (PDA), mobile phones, car navigation systems, and tablet computers have become increasingly widespread, and the display screens of these products are generally built with The touch panel is used for users to input information with fingers or stylus, and the touch panel has a variety of touch technologies, among which the capacitive touch panel is compared with the resistive direct contact method by sensing the change of capacitance , the capacitive touch panel has the advantages of better light transmittance and less damage.

FIG. 1A is a schematic diagram of a known transparent capacitive touch panel, and FIG. 1B is an exploded schematic diagram of the transparent capacitive touch panel in FIG. 1A before bonding. Please refer to FIG. 1A and FIG. 1B, the known transparent capacitive touch panel 100 is a double-layer structure, and mainly includes a lower transparent substrate 110, an upper transparent substrate 120 and a transparent cover plate (cover lens) 130, one of which The upper and lower ITO layers 122 , 112 are respectively formed on the surfaces of the upper and lower transparent substrates 120 , 110 , and the two anti-reflection layers 132 are respectively coated on both sides of the transparent cover plate 130 .

Next, make the upper and lower ITO layers 122, 112 face each other, and glue the upper and lower transparent substrates 120, 110 with an optical adhesive 140, so that the optical adhesive 140 is pasted on the upper and lower ITO layers 122, 112, the transparent cover plate 130 is bonded to the upper transparent substrate 120 with an optical adhesive 150, and the assembly of the transparent capacitive touch panel 100 is completed, and the transparent cover plate 130 is mainly used to protect the upper and lower transparent substrates 120 , 110.

However, since the structure of the transparent capacitive touch panel 100 is too thick to meet the light, thin and short design concept, the known technology proposes a single-layer structure to reduce the thickness. FIG. 2A is a schematic diagram of another known transparent capacitive touch panel, and FIG. 2B is an exploded schematic diagram of the transparent capacitive touch panel in FIG. 2A before bonding. Please refer to FIG. 2A and FIG. 2B , the known transparent capacitive touch panel 200 includes a transparent substrate 210 and a transparent cover plate 220, and an upper and a lower indium tin oxide layer 212, 214 are respectively formed on both sides of the transparent substrate 210. opposite surfaces, and two anti-reflection layers 222 are respectively coated on two opposite surfaces of the transparent cover plate 220 .

Next, the transparent cover plate 220 is glued to the transparent substrate 210 with an optical glue 230, and the assembly of the transparent capacitive touch panel 200 is completed; although the structure of the transparent capacitive touch panel 200 has a small thickness, its manufacturing process is relatively difficulty.

Specifically, the upper and lower indium tin oxide layers 212, 214 are sequentially formed on the surface of the transparent substrate 210. After the upper indium tin oxide layer 212 is fabricated, the transparent substrate 210 must be turned over to continue forming the lower indium tin oxide layer. The tin oxide layer 214 will cause the upper ITO layer 212 to contact the platform or the robot arm and be damaged, thereby reducing the yield of the transparent capacitive touch panel 200 .

FIG. 3A is a schematic diagram of yet another known transparent capacitive touch panel, and FIG. 3B is an exploded schematic diagram of the transparent capacitive touch panel in FIG. 3A before bonding. Please refer to FIG. 3A and FIG. 3B, the known transparent capacitive touch panel 300 includes a transparent substrate 310 and a transparent cover plate 320, wherein a lower indium tin oxide layer 312, an insulating layer 314, an upper indium tin oxide layer 316 is sequentially formed on the surface of the transparent substrate 310 , and two anti-reflection layers 322 are respectively coated on two opposite surfaces of the transparent cover plate 320 .

Next, the transparent cover plate 320 is bonded to the transparent substrate 310 with optical glue 330, and the assembly of the transparent capacitive touch panel 300 is completed. The process still has many disadvantages.

Specifically, the known technology must add steps for making the insulating layer 312, but this will increase the man-hours and costs of manufacturing the transparent capacitive touch panel 300. In addition, the insulating layer 312 must have a contact window (contact window) (not shown). ) to electrically conduct the upper indium tin oxide layer 316 to the integrated circuit (IC) (not shown) on the transparent substrate 310, so that it is necessary to add a photomask process to make the contact window, and greatly improve the transparent capacitive The manufacturing cost and difficulty of the touch panel 300 .

Contents of the invention

In view of this, the purpose of the present invention is to provide a transparent capacitive touch panel, which has a relatively low manufacturing cost and is relatively easy to assemble, and can reduce its thickness and weight.

In addition, another object of the present invention is to provide a method for manufacturing a transparent capacitive touch panel, the process of which is relatively simple, and the yield rate of the transparent capacitive touch panel can be greatly improved.

To achieve the above or other objectives, the present invention proposes a transparent capacitive touch panel, comprising a transparent cover plate, a transparent substrate, a first transparent electrode layer, a second transparent electrode layer and a transparent adhesive layer, wherein The transparent cover plate is parallel to the transparent substrate, and the first transparent electrode layer and the second transparent electrode layer are respectively arranged on one side of the transparent cover plate and the transparent substrate, and the transparent adhesive layer is used for bonding the first transparent electrode layer and the second transparent electrode layer. The transparent electrode layer is used to combine the transparent cover plate and the transparent substrate.

To achieve the above or other objectives, the present invention further proposes a transparent capacitive touch panel, comprising a transparent cover plate, a first transparent electrode layer, an insulating layer and a second transparent electrode layer, wherein the first transparent electrode The layer is arranged on the surface of the transparent cover plate, the insulating layer is arranged on the surface of the first transparent electrode layer different from the surface of the transparent cover plate, and the second transparent electrode layer is arranged on the surface of the insulating layer different from the first transparent electrode layer.

In an embodiment of the present invention, the above-mentioned transparent capacitive touch panel further includes a shielding layer, and the shielding layer can be disposed on the surface of the transparent substrate different from the second transparent electrode layer, and the material of the shielding layer is, for example, indium tin oxide or indium zinc oxide.

In an embodiment of the present invention, the above-mentioned transparent capacitive touch panel may further include a decoration layer and a flat layer, wherein the decoration layer is disposed between the transparent cover plate and the first transparent electrode layer, and the flat layer is disposed between between the decorative layer and the first transparent electrode layer, and the color of the decorative layer can be a single color such as black or colored, and the decorative layer can have a set graphic, and the material of the decorative layer can be an insulating material or a conductive material , and the material of the flat layer may be insulating material.

To sum up, in the transparent capacitive touch panel of the present invention, the first transparent electrode layer and the second transparent electrode layer are respectively fabricated on the surface of the transparent cover plate and the transparent substrate, and then the transparent cover plate and the transparent substrate relatively sticky. Compared with the known technology, the present invention does not need to sequentially fabricate two transparent electrode layers on the transparent substrate, so the process is relatively simple, and the yield rate can be greatly improved, and the present invention does not need to make an insulating layer, so the process steps can be simplified , to reduce the manufacturing cost of the transparent capacitive touch panel.

Description of drawings

1A and 1B are schematic diagrams of a known transparent capacitive touch panel.

2A and 2B are schematic diagrams of another known transparent capacitive touch panel.

3A and 3B are schematic diagrams of yet another known transparent capacitive touch panel.

4A and 4B are schematic diagrams of a transparent capacitive touch panel according to a first embodiment of the present invention.

5A and 5B are schematic diagrams of another transparent capacitive touch panel according to the first embodiment of the present invention.

6A and 6B are schematic diagrams of another transparent capacitive touch panel according to the first embodiment of the present invention.

7A and 7B are schematic diagrams of another transparent capacitive touch panel according to the first embodiment of the present invention.

FIG. 8 is a schematic diagram of a transparent capacitive touch panel according to a second embodiment of the present invention.

FIG. 9 is a schematic diagram of another transparent capacitive touch panel according to the second embodiment of the present invention.

Symbol Description

100, 200, 300: Transparent capacitive touch panel 110: Lower transparent substrate

112, 214, 312: lower indium tin oxide layer 120: upper transparent substrate

122, 212, 316: upper indium tin oxide layer 130, 220, 320: transparent cover plate

132, 222, 322: anti-reflection layer 140, 150, 230: optical glue

210, 310: transparent substrate 314: insulating layer

400, 500, 600, 700, 800, 900: transparent capacitive touch panel

410: Transparent substrate 412, 816: Second transparent electrode layer

420, 810: transparent cover plate 422, 812: first transparent electrode layer

430: transparent adhesive layer 524, 526, 918: anti-reflection layer

624, 911: decorative layer 626, 913: flat layer

714: shielding layer 814: insulating layer

Detailed ways

first embodiment

FIG. 4A is a schematic diagram of a transparent capacitive touch panel according to the first embodiment of the present invention, and FIG. 4B is an exploded schematic diagram of the transparent capacitive touch panel of FIG. 4A before bonding. 4A and 4B, the transparent capacitive touch panel 400 of the present invention includes a transparent substrate 410, a transparent cover plate 420 and a transparent adhesive layer 430, wherein the first transparent electrode layer 422 and the second transparent electrode layer 412 are respectively It is arranged on the opposite surface of the transparent cover plate 420 and the transparent substrate 412, and a transparent adhesive layer 430 is used to bond the first transparent electrode layer 422 and the second transparent electrode layer 412, so as to combine the transparent substrate 410 and the transparent cover plate 420 arranged in parallel. .

Compared with the known technology that needs to sequentially fabricate two layers of indium tin oxide layers on the surface of the transparent substrate (as shown in Figure 2B and Figure 3B), the present invention fabricates the second transparent electrode layer on the surface of the transparent substrate 410 and the transparent cover plate 420 respectively 412 and the first transparent electrode layer 422, so the process of the present invention is relatively simple and the yield rate can be greatly improved.

In this embodiment, the material of the transparent substrate 410 is glass, the material of the second transparent electrode layer 412 is indium tin oxide, and the material of the transparent cover plate 420 can be glass or plastic, and the material of the first transparent electrode layer 422 The material can be indium tin oxide.

Next, the first transparent electrode layer 422 and the second transparent electrode layer 412 are arranged oppositely, and the transparent substrate 410 and the transparent cover plate 420 arranged in parallel are bonded together with a transparent adhesive layer 430 such as a liquid transparent adhesive, and the production of the transparent capacitive type is completed. Touch panel 400 .

In the foregoing description, the materials of the transparent substrate 410, the transparent cover plate 420, the transparent adhesive layer 430, the first transparent electrode layer 422, and the second transparent electrode layer 412 are all examples, and the present invention does not limit their materials; for example , the transparent substrate 410 can also be strengthened glass, and the transparent adhesive layer 430 can also be double-sided tape, and the material of the first transparent electrode layer 422 and the second transparent electrode layer 412 can also be indium zinc oxide, etc., familiar with this Those skilled in the art may make slight changes based on the foregoing, but they still fall within the scope of the present invention.

In addition, although the method of forming the second transparent electrode layer 412 is described first, and then the method of forming the first transparent electrode layer 422 is described, the present invention does not limit the order of making the first transparent electrode layer 422 and the second transparent electrode layer 412 .

Since the transparent capacitive touch panel 400 has a single-layer structure, compared with the double-layer capacitive touch panel 100 (as shown in FIG. 1A ), the transparent capacitive touch panel 400 of the present invention The thickness is thinner and the weight is lighter, so it can meet the light and thin design requirements. In addition, the present invention does not need to make an insulating layer, so the process steps can be simplified, and a photomask process can be omitted to reduce the production of the transparent capacitive touch panel 400. cost.

In order to avoid the glare of the transparent capacitive touch panel, the present invention can further add an anti-reflection layer on the surface of the transparent cover plate. The following will give another embodiment and illustrate it with illustrations. For the sake of simplicity, the components with the same name are still used same label.

5A is a schematic diagram of another transparent capacitive touch panel according to the first embodiment of the present invention, and FIG. 5B is an exploded schematic diagram of the transparent capacitive touch panel in FIG. 5A before bonding. Please refer to FIG. 5A and FIG. 5B , the transparent capacitive touch panel 500 of this embodiment is similar to the aforementioned transparent capacitive touch panel 400 (as shown in FIG. 4A ), the difference is that the transparent capacitive touch panel 500 additionally The anti-reflection layers 524 and 526 are used to reduce the reflection of external light on the transparent cover plate 420 .

Anti-reflection layers 524, 526 are respectively formed on the two surfaces of the transparent cover plate 420, and one anti-reflection layer 524 is located between the transparent cover plate 420 and the first transparent electrode layer 422, and the other anti-reflection layer 526 is located on the The other side of the transparent cover plate 420. In addition, in this embodiment, the antireflection layers 524, 526 are formed first, and then the first transparent electrode layer 422 is formed, but the present invention is not limited to forming the antireflection layers 524, 526 and the first transparent electrode layer. The sequence of the transparent electrode layer 422 .

Furthermore, those skilled in the art can only fabricate the anti-reflection layer 524 or the anti-reflection layer 526 according to actual needs, but they all fall within the scope of the present invention. In addition, the present invention can use a decorative layer to make a pattern, wherein the pattern of the decorative layer can be a trademark mark or a product slogan (slogan) for users to understand. The following will give another embodiment and illustrate it with illustrations.

6A is a schematic diagram of another transparent capacitive touch panel according to the first embodiment of the present invention, and FIG. 6B is an exploded schematic diagram of the transparent capacitive touch panel in FIG. 6A before bonding. Please refer to FIG. 6A and FIG. 6B , the transparent capacitive touch panel 600 of this embodiment is similar to the aforementioned transparent capacitive touch panel 400 (as shown in FIG. 4A ), the difference is that the transparent capacitive touch panel 600 has additional The decorative layer 624 and the flat layer 626, and the decorative layer 624 can be a single color or colored text or pattern with a predetermined shape, so as to clearly mark the function or feature of the product.

In this embodiment, the decorative layer 624 is first formed on the surface of the transparent cover plate 420, and then the decorative layer 624 is planarized to form a flat layer 626. The color of the decorative layer 624 can be black or other colors, and it can be used In addition, the present invention can also omit the flat layer 626, and directly form the first transparent electrode layer 422 on the surface of the decoration layer 624. In the case of omitting the flat layer 626, the material of the decoration layer 624 It is an insulating material; but in the case of having a flat layer 626, the material of the flat layer 626 can be an insulating material, and the material of the decoration layer 624 is not limited to an insulating material or a conductive material.

In order to make the transparent capacitive touch panel have a better resistance to static electricity or electromagnetic interference, the present invention can provide a shielding layer to block the interference from the display or circuit board below. Another embodiment will be illustrated below.

FIG. 7A is a schematic diagram of another transparent capacitive touch panel according to the first embodiment of the present invention, and FIG. 7B is an exploded schematic diagram of the transparent capacitive touch panel in FIG. 7A before bonding. 7A and 7B, the transparent capacitive touch panel 700 of this embodiment is similar to the aforementioned transparent capacitive touch panel 400 (as shown in FIG. 4A ), the difference is that the transparent capacitive touch panel 700 is additionally provided with a shield layer 714 to protect the structure above it.

The shielding layer 714 is formed on the surface of the transparent substrate 410 different from the second transparent electrode layer, so that the electromagnetic effect generated outside the shielding layer 714 can be shielded by the shielding layer 714, which can prevent the electromagnetic effect from the outside from interfering with the capacitive The operation of the touch panel, and the material of the shielding layer 714 can be indium tin oxide or indium zinc oxide, and the shielding layer 714 can also be a mesh structure, and can be electrically connected to the ground.

Although the preceding paragraphs describe the anti-reflection layer, decorative layer and shielding layer, the present invention can also implement the anti-reflection layer, decorative layer or shielding layer in combination, and those skilled in the art can add an anti-reflection layer according to actual design requirements , decorative layer or shielding layer to improve the quality of transparent capacitive touch panels.

Since the transparent capacitive touch panel of the present invention is generally assembled with a liquid crystal display panel, and the liquid crystal display panel is equipped with a color filter substrate to generate colors, the transparent substrate of the present invention can further be a color filter substrate, thereby facilitating The thickness and weight of the overall assembly of the transparent capacitive touch panel and the liquid crystal display panel can be reduced.

second embodiment

The aforementioned embodiments all have a single-layer structure, wherein the first transparent electrode layer and the second transparent electrode layer are respectively disposed on the surfaces of the transparent substrate and the transparent cover plate. In the present invention, both the first transparent electrode layer and the second transparent electrode layer can be fabricated on the surface of the transparent cover plate, so that the thickness of the transparent capacitive touch panel can be greatly reduced without using a transparent substrate. Hereinafter, another embodiment will be given and described with illustrations. However, in order to avoid confusion with the above-mentioned embodiments, each component will be indicated by other symbols.

FIG. 8 is a schematic diagram of a transparent capacitive touch panel according to a second embodiment of the present invention. Please refer to FIG. 8, a transparent capacitive touch panel 800 of this embodiment includes a transparent cover plate 810, a first transparent electrode layer 812, an insulating layer 814 and a second transparent electrode layer 816, wherein the first transparent electrode layer 812, the insulating layer 814 and the second transparent electrode layer 816 are sequentially formed on the surface of the transparent cover plate 810 .

In other words, the first transparent electrode layer 812 is located between the transparent cover plate 810 and the insulating layer 814, and the insulating layer 814 is located between the first transparent electrode layer 812 and the second transparent electrode layer 816, and the transparent cover plate 810 The material can be glass or plastic.

In addition _, the insulating layer 814 may be composed of silicon nitride ( _SixNy ).

Compared with the known technology (as shown in FIG. 2A or 3A ), since the transparent capacitive touch panel 800 does not need to be provided with a transparent substrate, this embodiment can greatly reduce the thickness and weight of the capacitive touch panel 800 to meet the light and thin requirements. design needs. In addition, the transparent capacitive touch panel 800 does not need to be bonded, so the manufacturing process can be further simplified, the man-hours can be reduced, and the manufacturing cost can be reduced.

It is worth noting that the present invention can also apply the above-mentioned concept of anti-reflection layer and decorative layer to this embodiment. The following is only a description of a preferred embodiment. Those skilled in the art can add anti-reflection layer and decorative layer according to actual needs. The decorative layer, and the relative positions between the reflective layer, the decorative layer and the first transparent electrode layer can be adjusted arbitrarily, but it still belongs to the scope of the present invention.

FIG. 9 is a schematic diagram of another transparent capacitive touch panel according to the second embodiment of the present invention. Please refer to FIG. 9 , the transparent capacitive touch panel 900 of this embodiment is similar to the aforementioned transparent capacitive touch panel 800 (as shown in FIG. 8 ), the difference is that the transparent capacitive touch panel 900 is further provided with an anti-reflection layer. 918 , the decoration layer 911 and the flat layer 913 , wherein the materials and functions of the anti-reflection layer 918 , the decoration layer 911 and the flat layer 913 are the same as those described above, and will not be repeated here.

Specifically, the anti-reflection layer 918 is located on the surface of the transparent cover plate 810 opposite to the first transparent electrode layer 812, and the decoration layer 911 is located between the transparent cover plate 810 and the first transparent electrode layer 812, and the flat layer 913 is used The space in the decoration layer 911 is planarized, and is located between the decoration layer 911 and the first transparent electrode layer 812 .

In summary, the transparent capacitive touch panel of the present invention has at least the following advantages:

1. Compared with the known technology that needs to sequentially fabricate two layers of indium tin oxide layers on the transparent substrate, the present invention fabricates the second transparent electrode layer and the first transparent electrode layer on the surface of the transparent substrate and the transparent cover plate respectively, so The process of the invention is relatively simple and can greatly improve the yield.

2. In addition, since the transparent capacitive touch panel of the first embodiment does not need to have an insulating layer, the process steps can be simplified, and a photomask process can be omitted to reduce its production cost.

3. Compared with the double-layer transparent capacitive touch panel, the single-layer transparent capacitive touch panel of the present invention is thinner and lighter in weight, so it can meet the light and thin design requirements; and The transparent capacitive touch panel of the second embodiment does not need a transparent substrate, so compared with all known transparent capacitive touch panel structures, it is thinner and lighter in weight.

4. The transparent capacitive touch panel of the second embodiment does not need to be bonded, so the manufacturing process can be further simplified, the man-hours can be reduced, and the manufacturing cost can be reduced.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, this The protection scope of the invention should be determined by the content defined in the claims.

Claims (16)

1. A transparent capacitive touch panel, characterized in that, comprising: a transparent cover plate; a first transparent electrode layer configured on one side of the transparent cover plate; a transparent substrate parallel to the transparent cover plate; a second transparent electrode layer disposed on the side of the transparent substrate facing the first transparent electrode layer; and A transparent adhesive layer, bonding the first transparent electrode layer and the second transparent electrode layer, so as to combine the transparent cover plate and the transparent substrate. 2 . The transparent capacitive touch panel according to claim 1 , further comprising an anti-reflection layer disposed on a surface of the transparent cover plate that is different from the first transparent electrode layer. 3. The transparent capacitive touch panel according to claim 1 or 2, further comprising an anti-reflection layer disposed between the transparent cover plate and the first transparent electrode layer. 4. The transparent capacitive touch panel according to claim 1, wherein the transparent substrate is a color filter substrate. 5. The transparent capacitive touch panel according to claim 1, further comprising a shielding layer disposed on a surface of the transparent substrate different from the second transparent electrode layer. 6. The transparent capacitive touch panel according to claim 1, further comprising a decoration layer disposed between the transparent cover plate and the first transparent electrode layer. 7 . The transparent capacitive touch panel according to claim 6 , further comprising a flat layer disposed between the decoration layer and the first transparent electrode layer. 8. The transparent capacitive touch panel according to claim 6 or 7, wherein the decoration layer is made of insulating material. 9 . The transparent capacitive touch panel as claimed in claim 7 , wherein the decorative layer is made of a conductive material, and the flat layer is made of an insulating material. 10. A transparent capacitive touch panel, comprising: a transparent cover plate; a first transparent electrode layer configured on the surface of the transparent cover plate; an insulating layer disposed on a surface of the first transparent electrode layer different from the transparent cover plate; and A second transparent electrode layer is arranged on the surface of the insulating layer different from the first transparent electrode layer. 11 . The transparent capacitive touch panel according to claim 10 , further comprising an anti-reflection layer disposed on a surface of the transparent cover plate different from the first transparent electrode layer. 12. The transparent capacitive touch panel according to claim 10 or 11, further comprising an anti-reflection layer disposed between the transparent cover plate and the first transparent electrode layer. 13. The transparent capacitive touch panel according to claim 10, further comprising a decoration layer disposed between the transparent cover plate and the first transparent electrode layer. 14. The transparent capacitive touch panel according to claim 13, further comprising a flat layer disposed between the decoration layer and the first transparent electrode layer. 15. The transparent capacitive touch panel according to claim 13 or 14, wherein the decoration layer is made of insulating material. 16 . The transparent capacitive touch panel as claimed in claim 14 , wherein the decorative layer is made of a conductive material, and the flat layer is made of an insulating material.

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