TWI607350B - Electromagnetic wave blocking the touch panel - Google Patents

Description

Touch panel that blocks electromagnetic waves from passing through

A touch panel, in particular, relates to a touch panel capable of blocking electromagnetic waves from passing through.

Since the liquid crystal display has been gradually popularized to various electronic products that need to display information to the user, and because of the user-friendly operation interface provided by the touch panel, the structure of the touch panel with the liquid crystal display has become an explicit feature of the electronic product. Instead of the configuration of an input device such as a button or a mouse, the liquid crystal display can be a simple and easy to use display and input dual interface.

Currently, the most common touch panels are resistive touch panels and capacitive touch panels. However, regardless of the type of touch panel, there is a design that is resistant to electromagnetic interference as required by regulations. The anti-electromagnetic interference of a general capacitive touch panel is mainly coated with a very thin transparent oxidized metal film (for example, indium tin oxide, ITO) on the lower surface of the substrate, which functions to shield electromagnetic interference to maintain the touch panel. Work in a good, interference-free environment. However, the currently designed transparent oxidized metal film has poor effectiveness in shielding electromagnetic interference.

In some occasions, the anti-electromagnetic interference capability of the touch panel must be particularly improved, for example, in a touch device in an aerospace vehicle. Therefore, the electromagnetic interference resistance of the extremely thin transparent metal oxide film is extremely insufficient. Therefore, in order to improve the ability to resist electromagnetic interference, many manufacturers have invested in research and development of products capable of high electromagnetic wave resistance.

At present, in addition to the problem of poor visibility in a strong light environment, touch-type liquid crystal displays are subject to electromagnetic interference when used in a high-frequency environment. It has a normal display function, and is currently applied to the anti-electromagnetic interference technology of a liquid crystal display. An ITO is plated on a polymer film, and the ITO film is adhered to the outer surface of the substrate of the touch panel, but since the film is Since the polymer material is used, it is easy to have a problem of poor adhesion to the touch panel substrate after long-term use. Moreover, since the ITO film is completely attached to the touch panel, and the touch panel is disposed on the front end surface of the liquid crystal display, the light transmittance of the entire liquid crystal display is lowered, and the development effect is affected. In addition, due to the nature of ITO materials, the effectiveness against electromagnetic interference is not good.

Please refer to the application of the invention patent No. I355600 for a high-visibility and anti-electromagnetic interference touch display device and a touch panel thereof. Referring to the first drawing, an exploded perspective view of a conventional touch panel display device includes a liquid crystal panel 10a including a thin film transistor substrate 11a, a liquid crystal layer 12a and an upper electrode layer from bottom to top. 13a, an upper substrate 14a and a first phase difference plate 141a; the first phase difference plate 141a is formed on the upper end surface of the upper substrate 14a; a touch panel 20a is disposed on the first phase difference plate 141a The touch panel 20 includes a substrate 21a, a lower conductive film 22a, a lower conductive electrode layer 23a, a spacer layer 24a, an insulating layer 25a, an adhesive layer 261a, and an upper conductive electrode layer 26a from bottom to top. And an upper conductive film 27a, a second phase difference plate 28a and a polarizer 29a; and a metal mesh 40a coupled to the polarizer 29a of the touch panel 20a.

In addition, in order to facilitate the bonding of the metal mesh 40a to the touch panel 20a, a layer of optical glue 42a is applied on the bottom surface of the metal mesh 40a, so that the whole metal mesh 40a has a bright surface effect, and is attached to the touch panel. The polarizer 29a in 20a; thereafter, bonded to the metal mesh 40a by a protective film 43a to prevent oxidation of the metal mesh 40a, wherein the metal mesh 40a is connected to a ground source to prevent the planar display device from being subjected to electromagnetic interference in the vicinity .

Although the use of the metal mesh can reduce the impedance and achieve the purpose of resisting external electromagnetic interference, since the metal mesh is provided with the touch panel on the touched side, the touch sensitivity and the light transmittance are deteriorated.

In addition, the metal mesh must be grounded to the grounding member (not shown) to effectively exert the anti-electromagnetic interference effect. The metal mesh and the grounding member are usually electrically connected by a conductive medium, but the metal mesh and the grounding member are separately disposed. On the upper and lower sides of the touch panel, the conductive medium must be properly configured according to the relative arrangement relationship between the metal mesh and the grounding member, which makes the configuration of the conductive medium limited, which is disadvantageous for assembly grounding.

The main object of the present invention is to provide a touch panel that blocks electromagnetic waves from passing through. According to the principle that the lower the surface resistivity is, the better the EMI shielding effect is, the direct coating on the touch panel is through the coating and the lithography etching technology. The side of the electromagnetic interference produces a mesh-shaped conductive layer with a low sheet resistance, so the mesh-shaped conductive layer can block the electromagnetic interference generated inside the display, and the electromagnetic interference is prevented from affecting the normal operation of the touch panel.

In order to achieve the above objective, the specific technical means of the present invention includes: a touch panel for blocking the passage of electromagnetic waves, disposed on a light emitting surface of a liquid crystal panel, wherein the touch panel for blocking electromagnetic waves includes at least: a substrate having a first surface and a second surface, wherein the first surface is a surface of the substrate corresponding to the light emitting surface, and the second surface is a reverse surface of the first surface of the substrate, wherein the first surface is formed with a mesh Conductive layer.

Another object of the present invention is to provide a touch panel that improves light transmittance and touch effect. The present invention does not need to provide a metal mesh on the substrate, but uses a coating film and a micro-etching technique to directly form a mesh conductive layer. Under the substrate, so this hair The top of the touch panel can be reduced by a layer structure to make the light transmission better, and the trigger signal time of the touch panel is shortened, and the touch effect is improved. Moreover, the mesh conductive layer can be pre-formed on the substrate for manufacturing the touch panel before the start of the touch panel display, and compared with the manufacturing process of the prior art, due to the reduction of the manufacturing steps and the overall production time, Make production more efficient.

Another object of the present invention is to provide a method for directly plating a mesh-shaped conductive layer on the back surface of a substrate, so that the mesh-shaped conductive layer has a better degree of bonding with the substrate, thereby improving the conventional technology to indirectly bond the metal. The disadvantage of poor adhesion of the net attach to the substrate.

The embodiments of the present invention will be described in more detail below with reference to the drawings and the <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt;

The present invention relates to a touch panel disposed in a display. The touch panel provided by the present invention can block electromagnetic waves from passing through, that is, electromagnetic waves generated by internal electrodes of the display can be completely blocked and reflected back by the touch panel of the present invention. It can avoid the electromagnetic wave generated inside the display to affect the normal operation of the touch panel.

Referring to the second figure, a schematic diagram of the touch panel of the present invention for blocking electromagnetic waves from passing through. The touch panel 1 of the present invention is disposed on the light emitting surface 31 of the display panel 3. The touch panel 1 of the present invention includes at least a substrate 11 located at the bottom of the touch panel 1, that is, the substrate 11 is touched. The portion of panel 1 that is closest to display panel 3.

In an embodiment of the invention, the display panel 3 is a liquid crystal panel, an organic light emitting diode panel, or a display panel having an image display function. The substrate 11 may be a light transmissive substrate, an ITO (Indium Tin Oxide (ITO) substrate, or other light transmissive Substrate.

The substrate 11 has a first surface 111 and a second surface 113. The first surface 111 is a surface of the substrate 11 corresponding to the light-emitting surface 31, and the second surface 113 is a reverse surface of the first surface 111 of the substrate 11, wherein the first surface 111 is A mesh conductive layer 13 is formed.

The mesh conductive layer 13 is formed by a sputtering technique and a lithography technique, and the mesh conductive layer 13 is made of copper metal and has a sheet resistance of less than 1 Ω/□.

The present invention further includes a grounding conductor 15 formed on one side of the mesh-shaped conductive layer 13 facing the display panel 3, and the grounding conductor 15 is electrically connected to a grounding source (not shown), wherein the grounding conductor 15 is Formed by coating and lithography techniques. The grounding conductor 15 is made of copper.

From the relationship between the sheet resistance and the EMI shield, the lower the sheet resistance value, the more the electromagnetic interference can be directly reflected back to achieve the electromagnetic shielding effect, and the present invention is formed by sputtering and lithography etching techniques. Compared with the metal mesh, the mesh conductive layer 13 has a lower sheet resistance than the metal mesh, so that the electromagnetic waves generated by the internal electrodes of the display can be directly reflected back to the inside of the display, thereby achieving the effect of electromagnetic shielding. Avoid electromagnetic waves affecting the normal operation of the touch panel 1.

Since the electromagnetic waves generated by the internal electrodes of the display are effectively shielded by the touch panel 1, others cannot know the position of us by sensing the electromagnetic waves, and have the effect of hiding the track, which is advantageous for military operations.

The substrate 11 formed with the mesh conductive layer 13 of the present invention can be disposed in various touch panels, such as a resistive touch panel, a capacitive touch panel or other types of touch panels. Detailed embodiments are described in the following embodiments. in.

Referring to the third figure, a schematic diagram of the touch panel of the present invention for blocking electromagnetic waves passing through is disposed on the resistive touch screen. The touch panel 1 and the display panel 3 of the present invention are installed in the resistive touch screen 10, and the resistive touch screen 10 further includes There are an optical film 101, a spacer layer 103, a transparent conductive film 105, a polarizer 107, and a protective sheet 109.

The optical film 101 is located between the touch panel 1 and the display panel 3; the protective sheet 109 is located above the second surface 113, and the polarizer 107 is located between the second surface 113 and the protective sheet 109.

The protective sheet 109 may be made of glass, PET, PAR, PEN, PMMA, ARTON, PES, ZEONOR, TAC or PC, so that the member under the protective sheet 109 is not damaged by external force.

The optical film 101 may be made of glass, PET, PAR, PEN, PMMA, ARTON, PES, ZEONOR, TAC or PC to avoid oxidation of the mesh-shaped conductive layer 13 and to prevent components above the optical film 101 from being damaged by external force. .

It is to be noted that only the components related to the features of the present invention are shown in the drawings, and other well-known components are not shown to facilitate the description of the present invention. That is, the touch panel display includes many components, but Does not affect the following instructions.

Only the transparent conductive film 105, the polarizer 107, and the protective sheet 109 are disposed on the top of the touch panel 1 in the second embodiment, because the present invention does not have a metal mesh disposed above the touch panel 1 as in the prior art, but is sputtered. And the lithography etching technology forms the grid-like conductive layer 13 under the touch panel 1 , so that the top of the touch panel 1 can be reduced in a layer structure, so that the light transmittance can be improved, and the sensing time of the touch panel can also be shortened. Improve touch performance. In particular, the grid-like conductive layer 13 formed by sputtering and lithography etching has a low sheet resistance and an excellent electromagnetic shielding effect.

The advantages of the present invention further include that the mesh conductive layer 13 and the grounding conductor 15 can be pre-formed on the substrate 11 for manufacturing the touch panel 1 before the resistive touch screen 10 (or capacitive touch screen) is started. Compared with the process of the prior art, it can reduce the production steps and the overall production time, which helps to improve the system. Efficiency.

Referring to the fourth figure, the present invention makes a schematic diagram of a substrate used for a capacitive touch screen. In an embodiment of the present invention, the present invention is further formed with a metal mesh layer 17 in which a metal mesh layer 17 is formed on the second surface 113, wherein the metal mesh layer 17 is made of copper. Thereby, the mesh-shaped conductive layer 13 and the metal mesh layer 17 on the upper and lower sides of the substrate 1 can form the upper and lower electrodes, and the metal mesh layer 17 is formed on the substrate 11 by sputtering and lithography. Therefore, the ITO film can be less adhered to the top of the touch panel 1 , that is, the ITO film adhered by the conventional technology is replaced by the metal mesh layer 17 plated, which helps the light transmittance and the touch effect to be improved.

In general, the mesh-shaped conductive layer 13 and the metal mesh layer 17 formed on the upper and lower sides of the substrate 1 have a lower sheet resistance value as compared with the ITO film which is bonded to the lower surface of the substrate 1 in the prior art. The better the degree of bonding, and the overall number of layers and thickness of the touch panel are reduced, thereby effectively improving the light transmittance and the touch effect of the touch panel.

Therefore, the substrate 11 of the touch panel of the present invention can be used to fabricate a single-mask mesh conductive layer 13 or a substrate 11 having a mesh conductive layer 13 and a metal mesh layer 17 on both sides according to different purposes of use. Touch panel, capacitive touch panel or other type of touch panel.

Referring to FIG. 5, a schematic diagram of a preferred embodiment of a panel for blocking electromagnetic waves passing through the present invention, and referring to a sixth embodiment, a schematic diagram of another preferred embodiment of the panel for blocking electromagnetic waves passing through the present invention. The panel 2 of the present invention is disposed above the light exit surface 31 of the display panel 3. The display panel 3 may be a liquid crystal panel, an organic light emitting diode panel, or a display panel with an image display function. The substrate 11 may be a light transmissive substrate, an ITO (Indium Tin Oxide (ITO) substrate, or other light transmissive substrate.

The panel 2 of the present invention comprises a substrate 21, wherein the substrate 21 has a first side 211 and second surface 213, the first surface 211 is a substrate 21 corresponding to one surface of the light-emitting surface 31, and the second surface 213 is a reverse surface of the first surface 211 of the substrate 21, wherein the first surface 211 is formed with a mesh-shaped conductive layer 13 . Further, the mesh conductive layer 13 is further formed with a grounding conductor 15 made of copper. For the manner of forming the mesh conductive layer 13 and the grounding conductor 15 and the related description, please refer to the foregoing, and no further details are provided herein.

As a preferred embodiment of the fifth embodiment, the panel 2 of the present invention further includes a polarizer 23 and a protective sheet 25. The polarizer 23 is located above the second face 213 of the substrate 21, and the protective sheet 25 is located above the polarizer 23, as shown in the fifth figure.

Alternatively, referring to another preferred embodiment shown in the sixth figure, the panel 2 of the present invention may further comprise a protective sheet 25, in the embodiment of Fig. 6, the protective sheet 25 is located above the mesh conductive layer 13, and the second The surface of face 213 is treated with an anti-glare and anti-reflective surface.

The above is only a preferred embodiment for explaining the present invention, and is not intended to limit the present invention in any way, and any modifications or alterations to the present invention made in the spirit of the same invention. All should still be included in the scope of the intention of the present invention.

1‧‧‧ touch panel

11‧‧‧Substrate

13‧‧‧Grid-like conductive layer

15‧‧‧Grounding conductor

17‧‧‧Metal mesh layer

111‧‧‧ first side

113‧‧‧ second side

2‧‧‧ panel

21‧‧‧Substrate

23‧‧‧ polarizer

25‧‧‧Protection film

3‧‧‧ display panel

31‧‧‧Glossy

10‧‧‧Resistive touch screen

101‧‧‧Optical film

103‧‧‧ spacer

105‧‧‧Transparent conductive film

107‧‧‧ polarizer

109‧‧‧Protection film

10a‧‧‧LCD panel

11a‧‧‧ Lower film transistor substrate

12a‧‧‧Liquid layer

13a‧‧‧Upper electrode layer

14a‧‧‧Upper substrate

141a‧‧‧First phase difference plate

20a‧‧‧Touch panel

21a‧‧‧Substrate

22a‧‧‧ under conductive film

23a‧‧‧Electrical electrode layer

24a‧‧‧ spacer

25a‧‧‧Insulation

261a‧‧‧Adhesive layer

26a‧‧‧Upper conductive electrode layer

27a‧‧‧Upper conductive film

28a‧‧‧Second phase difference plate

29a‧‧‧ polarizer

40a‧‧‧Metal net

42a‧‧‧Optical adhesive

43a‧‧‧Protective film

The first figure is an exploded perspective view of a conventional touch panel display device.

The second figure is a schematic diagram of the touch panel through which electromagnetic waves are blocked according to the present invention.

The third figure is a schematic diagram of the touch panel disposed on the resistive touch screen for blocking electromagnetic waves passing through the present invention.

The fourth figure is a schematic diagram of a substrate used for making a capacitive touch screen according to the present invention.

The fifth figure is a schematic view of a preferred embodiment of the panel for blocking electromagnetic waves passing through the present invention.

Fig. 6 is a view showing another preferred embodiment of the panel for blocking electromagnetic waves passing through the present invention.

1‧‧‧ touch panel

11‧‧‧Substrate

13‧‧‧ mesh conductive layer

15‧‧‧Grounding conductor

111‧‧‧ first side

113‧‧‧ second side

3‧‧‧ display panel

31‧‧‧Glossy

Claims (18)

A touch panel for blocking electromagnetic waves is disposed on a light emitting surface of a display panel. The touch panel for blocking electromagnetic waves includes at least: a substrate having a first surface and a second surface, the first The surface of the substrate corresponds to a surface of the light-emitting surface, and the second surface is a reverse surface of the first surface of the substrate, wherein the first surface is formed with a grid-like conductive layer, further comprising a grounding wire, the grounding A wire is formed on a side of the grid-like conductive layer facing the display panel, and the ground wire is electrically connected to a ground source. The touch panel for blocking the passage of electromagnetic waves according to claim 1, wherein the grid-shaped conductive layer is formed by a sputtering technique and a photolithography technique. The touch panel for blocking the passage of electromagnetic waves according to claim 2, wherein the grid-like conductive layer is made of copper metal. The touch panel for blocking the passage of electromagnetic waves according to claim 3, wherein the grid-like conductive layer has a sheet resistance value of less than 1 Ω/□. The touch panel for blocking the passage of electromagnetic waves according to claim 1, wherein the grounding wire is made of copper. The touch panel for blocking the passage of electromagnetic waves according to claim 1, wherein the touch panel further comprises a protective sheet, the protective sheet being located on the second surface. The touch panel for blocking the passage of electromagnetic waves according to claim 6 , further comprising a polarizer disposed between the second surface and the protective sheet. The touch panel for blocking the passage of electromagnetic waves according to claim 6 of the patent application scope, wherein the protection sheet may be made of glass, PET, PAR, PEN, PMMA, ARTON, PES, ZEONOR, TAC or PC. The touch panel for blocking the passage of electromagnetic waves according to claim 1, further comprising a metal mesh layer formed on the second surface. The touch surface for blocking electromagnetic waves passing according to item 9 of the patent application scope a plate in which the metal mesh layer is made of copper. The touch panel for blocking the passage of electromagnetic waves according to claim 1, wherein the display panel is at least one of a liquid crystal panel and an organic light emitting diode panel. The touch panel for blocking the passage of electromagnetic waves according to claim 1, further comprising an optical film between the touch panel and the display panel. The touch panel for blocking electromagnetic waves according to claim 13 , wherein the optical film is made of glass, PET, PAR, PEN, PMMA, ARTON, PES, ZEONOR, TAC or PC. A panel for blocking electromagnetic waves is disposed on a light emitting surface of a display panel. The panel for blocking electromagnetic waves includes at least: a substrate having a first surface and a second surface, the first surface being the substrate Corresponding to a surface of the light-emitting surface, the second surface is a reverse surface of the first surface of the substrate, wherein the first surface is formed with a grid-like conductive layer, further comprising a grounding wire, wherein the grounding wire is formed on the surface The surface of the mesh conductive layer facing the display panel is electrically connected to a ground source. The panel for blocking the passage of electromagnetic waves according to claim 14, further comprising a polarizer and a protective sheet, the polarizer being located on the second surface, the protective sheet being located above the polarizer. The panel for blocking the passage of electromagnetic waves according to claim 14 of the patent application, further comprising a protective sheet, the protective sheet being located above the mesh conductive layer. A panel for blocking electromagnetic waves according to claim 16 wherein the surface of the second surface is treated with an anti-glare and anti-reflection surface. A panel for blocking the passage of electromagnetic waves according to claim 14 of the patent application, wherein the grounding conductor is made of copper.