TWI566157B - Touch panel - Google Patents

Description

Touch panel

The present invention relates to a touch panel.

With the rapid development of electronic products, the operation mode of manipulating electronic products through a touch panel has gradually become popular. Moreover, since the electronic product can be directly manipulated by touching the display screen of the touch panel, the simple operation and easy-to-use characteristics are also popular among users.

In the production process of the touch panel, due to the lower resistance of the metal mesh (Metal Mesh), the structure of the Indium Tin Oxide (ITO) in the touch panel is gradually replaced by the material of the metal mesh. .

However, the surface of the metal mesh has silver oxide (Ag2O) molecules, and when these silver oxide molecules contact water molecules in the air, they easily cause dissociation of silver ions (Ag+). Then, under the action of the electric field, silver ions will flow from the region with higher potential on the metal grid to the region with lower potential, causing silver ion migration (Silver Ions' Migration). More specifically, the migration of silver ions causes a bypass between the conductors that are not electrically connected, causing a drop in insulation or even a short circuit, which in turn causes a malfunction of the touch panel.

One aspect of the present invention provides a touch panel that can effectively overcome the phenomenon of silver ion migration in a metal mesh.

According to an embodiment of the invention, a touch panel includes a body metal mesh, a light transmissive plate, an optical glue, a film body, and a colloid. The optical glue is bonded between the metal mesh and the light transmissive plate. The film body covers the metal mesh away from one side of the light transmissive plate. The colloid surrounds the edge of the metal mesh and connects the film body to the light transmissive plate, wherein the film body, the colloid and the light transmissive plate seal the metal mesh.

In one or more embodiments of the present invention, the film body is an explosion-proof film.

In one or more embodiments of the present invention, the film body has a transmittance of preferably greater than 91%.

In one or more embodiments of the present invention, the film body has a size of about 1 mm which is contracted to the edge of the light-transmitting sheet.

In one or more embodiments of the present invention, the film body described above has an antireflection film.

In one or more embodiments of the invention, the film body is formed by coating an explosion-proof coating.

In one or more embodiments of the present invention, the above-mentioned colloid is a waterproof insulating rubber.

In one or more embodiments of the present invention, the colloid is an ultraviolet curable waterproof insulating rubber.

In one or more embodiments of the present invention, the light transmissive sheet is a glass sheet.

In one or more embodiments of the present invention, the optical glue described above is a high transparency optical adhesive.

The above-described embodiments of the present invention have at least the following advantages over the known prior art:

(1) Since the metal mesh is sealed by the film body, the colloid and the light-transmissive plate, the metal mesh does not come into contact with the air, and the silver oxide molecules on the surface of the metal mesh do not chemically interact with the water molecules in the air. The silver ions are dissociated, so that the silver ion migration phenomenon of the metal mesh can be effectively overcome.

(2) The membrane body is an explosion-proof membrane. Due to its multi-layer characteristics, even if the surface layer of the explosion-proof membrane is damaged, the explosion-proof membrane is not easily cracked, thereby providing further protection for the touch panel.

(3) The colloid is a waterproof insulating rubber, which can further prevent the water molecules in the air from coming into contact with the metal mesh, and further enhances the phenomenon of overcoming the migration of silver ions in the metal grid by the characteristics of electrical insulation.

100‧‧‧ touch panel

110‧‧‧Metal grid

120‧‧‧Transparent sheet

130‧‧‧Optical adhesive

140‧‧‧membrane body

150‧‧‧colloid

X‧‧‧ line segment

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

Figure 2 is a cross-sectional view along line X of Figure 1.

The embodiments of the present invention are disclosed in the following drawings, and the details of However, it should be understood that these practical details are not applied to limit the issue. Bright. 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 schematic manner in order to simplify the drawings.

Unless otherwise defined, all terms (including technical and scientific terms) used herein are intended to mean the meaning Furthermore, the definition of the above vocabulary in a commonly used dictionary should be interpreted as meaning consistent with the related art of the present invention in the content of the present specification. Unless specifically defined, these terms are not to be interpreted as idealized or overly formal.

In practical applications, the metal mesh (Metal Mesh) on the touch panel has silver oxide (Ag2O) molecules on its surface. When these silver oxide molecules come into contact with water molecules in the air, it is easy to cause Dissociation of silver ions (Ag+). Then, under the action of the electric field, silver ions will flow from the region with higher potential on the metal grid to the region with lower potential, causing silver ion migration (Silver Ions' Migration). More specifically, the migration of silver ions causes a bypass between the conductors that are not electrically connected, causing a drop in insulation or even a short circuit, which in turn causes a malfunction of the touch panel.

Please refer to pictures 1~2. FIG. 1 is a top view of a touch panel 100 according to an embodiment of the invention. Fig. 2 is a cross-sectional view showing a line segment X of Fig. 1. As shown in FIGS. 1 to 2 , a touch panel 100 includes a metal mesh 110 , a light transmissive plate 120 , an optical adhesive 130 , a film body 140 , and a colloid 150 . The optical glue 130 is bonded between the metal mesh 110 and the light transmissive plate 120. The film body 140 covers the metal mesh 110 away from one side of the light transmissive plate 120. The colloid 150 surrounds the edge of the metal mesh 110 and connects the film body 140 with the transparent plate 120, wherein the film body 140, the colloid 150 and the light transmissive plate 120 seal the metal mesh 110. That is to say, the membrane body 140, the colloid 150 and the transparent plate 120 are sealed, the metal mesh 110 is not in contact with the air, and the silver oxide molecules on the surface of the metal mesh 110 are less likely to chemically react with the water molecules in the air. The silver ion is dissociated by the action, so that the silver ion migration phenomenon of the metal mesh 110 can be effectively overcome.

In actual operation, the user can press the finger 150 or other touch tools, such as a stylus pen, on the colloid 150 of the touch panel 100, thereby causing the metal mesh 110 to locally deform in the pressed region due to the metal. The grid 110 is electrically conductive, and by detecting a voltage change caused by local deformation of the metal mesh 110, the position of the touch on the colloid 150 can be discriminated.

In the present embodiment, the film body 140 is an explosion-proof film. In general, the explosion-proof film is a transparent polyester film and a multi-layer film laminate structure. Due to the multi-layer characteristics, even if the surface layer of the explosion-proof film is broken, the explosion-proof film is not easily cracked, thereby being the touch panel 100. Provide further protection. Moreover, the penetration rate of the explosion-proof film (ie, the film body 140) is preferentially greater than 91%, so that when the explosion-proof film and the sensor of the touch panel (not shown) are attached, the entire touch module (Fig. Not shown, the touch panel 100 is part of the touch module) has a penetration rate of up to 88%. It should be understood that the materials of the above-mentioned film body 140 are merely exemplary and are not intended to limit the present invention. Those skilled in the art to which the present invention pertains should appropriately select the material of the film body 140 according to actual needs.

In practical applications, the explosion-proof film (ie, the film body 140) may be sized to be retracted to the edge of the light-transmitting sheet 120 by about 1 mm, whereby the metal The grid 110 can be completely covered by the explosion-proof membrane, and the light-transmissive sheet 120 still has sufficient surface at the edge to allow the gel 150 to be joined.

Further, in order to achieve better transmittance of the touch module, an explosion-proof film having an anti-reflective film (AR film) (not shown) may be covered, or the film body 140 may be An explosion-proof coating (not shown) is formed to increase the transmittance of the entire touch module from 88% to about 91%.

Furthermore, in the present embodiment, the colloid 150 is a waterproof insulating rubber, which can further prevent water molecules in the air from coming into contact with the metal mesh 110, and can further strengthen the metal mesh 110 by the characteristics of its electrical insulation. The phenomenon of silver ion migration. Further, the colloid 150 can be an ultraviolet (UV) curing type waterproof insulating rubber, that is, the waterproof insulating rubber can be cured after being irradiated with ultraviolet rays, so that the process of the touch panel 100 can be better operated. Sex. Similarly, it should be understood that the materials of the above-mentioned colloid 150 are merely illustrative and are not intended to limit the present invention. Those having ordinary knowledge in the technical field of the present invention should appropriately select the material of the colloid 150 according to actual needs.

In the present embodiment, the light-transmitting sheet 120 is a glass sheet, and the glass sheet can further improve the overall structural strength of the touch panel 100, but the invention is not limited thereto.

On the other hand, in the present embodiment, the optical film 130 is an optically transparent optical film (Optically Clear Adhesive), but the invention is not limited thereto.

In summary, the technical solution of the present invention is compared with the prior art. There are obvious advantages and benefits. Through the above technical solutions, considerable technological progress can be achieved, and the industrial use value is widely utilized, which has at least the following advantages:

(1) Since the metal mesh is sealed by the film body, the colloid and the light-transmissive plate, the metal mesh does not come into contact with the air, and the silver oxide molecules on the surface of the metal mesh do not chemically interact with the water molecules in the air. The silver ions are dissociated, so that the silver ion migration phenomenon of the metal mesh can be effectively overcome.

(2) The membrane body is an explosion-proof membrane. Due to its multi-layer characteristics, even if the surface layer of the explosion-proof membrane is damaged, the explosion-proof membrane is not easily cracked, thereby providing further protection for the touch panel.

(3) The colloid is a waterproof insulating rubber, which can further prevent the water molecules in the air from coming into contact with the metal mesh, and further enhances the phenomenon of overcoming the migration of silver ions in the metal grid by the characteristics of electrical insulation.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

100‧‧‧ touch panel

110‧‧‧Metal grid

120‧‧‧Transparent sheet

130‧‧‧Optical adhesive

140‧‧‧membrane body

150‧‧‧colloid

Claims (9)

A touch panel comprises: a metal mesh; a light transmissive plate; an optical glue bonded between the metal mesh and the transparent plate; a film body covering the metal mesh away from the transparent plate And a colloid surrounding the edge of the metal mesh and connecting the film body and the light transmissive plate, the film body being retracted to an edge of the light transmissive plate by about 1 mm, wherein the film body, The colloid seals the metal mesh with the light transmissive sheet. The touch panel of claim 1, wherein the film body is an explosion-proof film. The touch panel of claim 1, wherein the transmittance of the film body is preferentially greater than 91%. The touch panel of claim 1, wherein the film body has an anti-reflection film. The touch panel of claim 1, wherein the film body is formed by coating an explosion-proof coating. The touch panel of claim 1, wherein the colloid is a waterproof insulating glue. The touch panel of claim 1, wherein the colloid is a UV-curable waterproof insulating glue. The touch panel of claim 1, wherein the transparent plate is a glass plate. The touch panel of claim 1, wherein the optical glue is a high transparency optical glue.