TWM480111U - Touch panel - Google Patents

Abstract

The present invention discloses a touch panel including a substrate and a conductive film disposed on the substrate to form a touch sensing area, characterized in that the conductive film is made with conductive nano metal and positive/negative sensitive material.

Description

Touch panel

The present invention relates to a touch panel, and more particularly to a conductive film formed by using a nano conductive metal and a photosensitive material.

Many electronic devices today have the functions of display and touch, and the technology of the touch panel is constantly being updated. A touch panel, such as a capacitive touch panel, requires a conductive film as the touch sensing area of the touch panel. The conductive film of the prior art often needs to use a metal layer of a metal oxide or a nano-conductive metal and a photosensitive material to pattern the metal layer through a yellow light process to form a pattern required for the conductive film.

Please refer to FIG. 1 , which is a schematic view of a conductive film of the prior art. The yellow light process used in the conductive film of the prior art requires the ultraviolet (UV) light source generated by the exposure machine to transfer the pattern on the mask to the positive or negative photoresist, and the pattern of the photoresist determines the patterning. As a result, after development, the pattern of the photoresist will be identical to or complementary to the reticle.

As shown in the figure, the yellow light process utilized by the conductive film of the prior art also needs to undergo procedures including exposure, development, etching, and stripping after covering the photoresist layer, and the patterned metal layer can be used as a conductive layer. film. However, as can be seen from the above, the yellow light process utilized by the conductive film of the prior art requires In a multi-step process, the metal layer can be patterned into the desired pattern, thus increasing the time required for the product to be completed. In addition, the cumbersome steps directly increase the cost of manufacturing the product.

The Republic of China Patent Publication No. 201145309 also discloses a touch panel which is coated on a flexible substrate by using a transparent colloid (or solution) mixed with a wire segment and dried to form a metal. The conductive film is interwoven with the wire segments, and then the conductive film interwoven with the wire segments is patterned to produce the desired pattern. However, this conductive film still needs to undergo etching and stripping steps during the patterning process, so the time and cost required for manufacturing the product cannot be effectively reduced.

Therefore, how to propose a conductive film, which can effectively improve the conductive film of the prior art requires too many steps, and the time and cost required for manufacturing the product has become an urgent problem.

In view of the above-mentioned problems of the prior art, one of the objects of the present invention is to provide a touch panel including a conductive film to solve the time and cost required for manufacturing a conductive film of the prior art due to the excessive steps required. Too high a problem.

According to one of the objectives of the present invention, a conductive film can be disposed on a substrate to form a touch sensing region, wherein the nano conductive metal can be uniformly dispersed into the positive or negative photosensitive material. A mixture is formed, and the mixture is applied onto a substrate to form a wet film, and the wet film is patterned by a yellow light exposure and development step to form a conductive film.

According to one of the objectives of the present invention, a touch panel is provided. The touch panel can include a substrate and a conductive film. The conductive film can be disposed on the substrate to form a touch sensing area. The conductive film is as described above.

As described above, the conductive film and the touch panel including the conductive film can have one or more of the following advantages:

(1) In one embodiment of the present invention, a wet film of a mixture of nano silver and a photoresist is patterned to produce a conductive film, and only a yellow light exposure and development step is required to obtain a desired pattern, thereby effectively improving the product manufacturing. The shortcomings of the process are cumbersome and costly.

(2) In one embodiment, the present invention utilizes a mixture of nano silver and photoresist as a material of a conductive film. Due to the characteristics of the photoresist, the film can be made to have a thickness of less than 1 um and a line width of less than 10 um. Effectively improved the problem of limited use of commercially available UV-type silver paste.

(3) The material applied in this creation can obtain the result of gray scale under low thickness, and thus can produce characteristics distinct from the transparent conductive layer or the opaque conductive layer of the prior art.

21, 31‧‧‧ substrate

22,32‧‧‧Natural mixture of nano-conductive metal and photosensitive material

23, 33‧‧‧ mask

24, 34, 54‧‧‧ conductive film

55‧‧‧Touch panel

S41~S44‧‧‧Step procedure

Figure 1 is a schematic view of a conductive film of the prior art.

Figure 2 is a schematic view of the conductive film of the present invention.

Figure 3 is a schematic view of one embodiment of the conductive film of the present invention.

Fig. 4 is a schematic view showing an embodiment of the electroconductive film of the present invention.

Fig. 5 is a schematic view showing an embodiment of the electroconductive film of the present invention.

Fig. 6 is a cross-sectional view showing the touch panel formed in Fig. 2.

Hereinafter, embodiments of the conductive film and the touch panel including the conductive film according to the present invention will be described with reference to the related drawings. For ease of understanding, the same components in the following embodiments have the same symbols. Mark to illustrate.

Please refer to Figure 2 for a schematic view of the conductive film of the present invention. As shown, a substrate 21 is first provided, and the nano-conductive metal is uniformly mixed with a positive or negative photosensitive material to produce a mixture 22, wherein the photosensitive material may be in a liquid or colloidal state. The mixture 22 of the nanoconductive metal and the photosensitive material may be coated on the substrate by a coating step to form a wet film. Next, the yellow film may be directly exposed by the photomask 23, and the developing step may be performed to pattern the wet film formed by the mixture 22 of the nano conductive metal and the photosensitive material to produce the conductive film 24 having a specific pattern. According to the manufacturing process shown in FIG. 2, the touch panel of the present invention is formed. As shown in FIG. 6, the substrate includes a substrate 21 and a conductive film 24 disposed on the substrate 21.

It can be seen from the above that the yellow light process used in the conductive film of the present invention requires only a step of exposure and development to form a conductive film having a specific pattern as desired. On the contrary, the yellow light process used in the conductive film of the prior art requires a step of etching and stripping. Therefore, the conductive film of the present invention can effectively reduce the steps required for the yellow light process, thereby reducing the time and cost required for product manufacturing.

Please refer to FIG. 3, which is a schematic diagram of an embodiment of the conductive film of the present invention. As shown, in the present embodiment, nano silver is mixed with a positive or negative photoresist to produce a mixture 32. Similarly, the photoresist can be in a liquid or colloidal state. In the next step, a mixture 32 of nano silver and photoresist is applied onto the substrate 31 by a coating step to form a wet film. Similarly, the exposure and development steps of the mask 33 can be directly used to pattern the wet film formed by the mixture 32 of nano silver and photoresist to thereby produce the conductive film 34 having a specific pattern.

It is worth mentioning that in the present embodiment, the mixture of nano silver and photoresist 32 is coated on the substrate 31 by a coating step to form a wet film, and then directly subjected to a process of exposure and development to produce a patterned pattern. The conductive film 34 can also reduce the steps required for the conventional yellow light process, effectively reducing the product manufacturing facility. The time and cost required.

On the other hand, since the nano conductive metal used in the embodiment is nano silver, and the nano silver needs to be above a certain content, the conductive effect can be achieved. This characteristic is similar to the currently commercially available UV type silver. The pulp is similar. However, in fact, the nano silver proposed in the present embodiment has more characteristics and advantages that are not available in the currently commercially available UV type silver paste.

For example, since a mixture of nano silver and photoresist is used as the material of the conductive film in the present embodiment, the above material can be formed into a film having a thickness of less than 1 um by any coating method; instead, a UV type silver paste is used. In the case of a material for a conductive film, a film is often formed by printing, and the thickness of the film formed in this manner is usually greater than 5 um, and if the process of using a yellow light is used, the process is complicated and lengthy and costly.

In addition, in this embodiment, a mixture of nano silver and photoresist is used as a material of the conductive film, and due to the characteristics of the photoresist material, the formed conductive film can achieve a line width of less than 10 um, which is undetectable by the human eye; Conversely, when a UV type silver paste is used as the material of the electroconductive film, only a line width of more than 20 um is usually obtained. Therefore, the materials used in this embodiment have better characteristics than the UV-type silver paste, and the use range is wider. Therefore, in addition to the touch panel, the material used in the embodiment can be applied to a touch panel for display purposes and the like; on the contrary, the UV type silver paste is limited due to its material properties. It is usually used to make traces around the panel.

In addition, the material applied in this embodiment is a low-thickness layer, preferably 4 μm or less, to obtain a gray scale result, thereby producing a transparent conductive layer or an opaque conductive layer of the prior art. Distinct features and uses.

Please refer to FIG. 4, which is a schematic diagram of an embodiment of the conductive film of the present invention. The flow shown in the figure is the flow of the embodiment of FIG. 3. The embodiment may include the following steps: In step S41, a substrate is provided.

In step S42, the nanosilver is uniformly dispersed into the positive or negative photoresist to form a mixture.

In step S43, the mixture is coated on a substrate to form a wet film.

In step S44, the wet film is patterned through a yellow light exposure and development step to form a conductive film.

Please refer to FIG. 5, which is a schematic diagram of an embodiment of the conductive film of the present invention. As described above, the conductive film 54 of the present invention can be disposed on the touch panel 55 as a touch sensing area, and can of course be used for other devices such as a touch panel.

In summary, in one embodiment, the present invention applies a mixture of nano silver and photoresist to a substrate to form a wet film, and the wet film is patterned to produce a conductive film in such a manner that the yellow light process is only The exposure and development steps are required to obtain the desired pattern, so the above-described manner can effectively reduce the time and cost required for product manufacture.

Moreover, in one embodiment, the present invention utilizes a mixture of nano silver and photoresist as a material of the conductive film. Due to the characteristics of the photoresist material, the thickness of the formed film can be less than 1 um, and the line width can be smaller than 10um, this can effectively improve the current limited use of commercially available UV-type silver paste. In addition, the material applied in this creation can obtain the result of gray scale under low thickness, so the conductive film applied to the present invention has a characteristic different from that of the conductive film of the prior art, so that it can be achieved. efficacy.

It can be seen that under the previous technology, this creation has indeed achieved the desired effect, and it is not easy for people who are familiar with the art to think about it. Its progressive and practicality has already met the patent application requirements.提出 Submit a patent application in accordance with the law, and ask your bureau to approve the application for this new type of patent, in order to encourage creation, to the sense of virtue.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of this creation shall be included in the scope of the appended patent application.

21‧‧‧Substrate

24‧‧‧Electrical film

Claims (6)

A touch panel has a substrate and a conductive film disposed on the substrate to form a touch sensing area, wherein the conductive film is made of a nanometer conductive metal and a positive or negative type. A photosensitive material is formed. The touch panel of claim 1, wherein the nano conductive metal is nano silver. The touch panel of claim 2, wherein the photosensitive material is a photoresist. The touch panel of claim 3, wherein the photosensitive material is in a liquid or colloidal state. The touch panel of claim 3, wherein the conductive film has a line width of less than 10 um. The touch panel of claim 3, wherein the conductive film has a thickness of less than 4 um.