TWM643277U - Improved touch panel black frame structure - Google Patents

Abstract

An improved black frame structure of a touch panel, comprising a transparent substrate; a transparent conductive film is arranged on the transparent substrate and has a touch sensing pattern composed of a plurality of sensing electrodes in series, and the sensing electrodes are arranged in series with pins; a conductive carbon glue layer is arranged on the pins; a first transparent insulating layer is covered on the transparent conductive film and the conductive carbon glue layer, and a first through hole is formed in the conductive carbon glue layer; The insulating layer is insulated and covered with a black frame and a second through hole is formed in the conductive carbon adhesive layer. The first and second through holes are coaxially connected. The signal wire layer is arranged in the black frame shielding area and contains a plurality of metal traces. One end of the metal trace is electrically connected to the conductive carbon adhesive layer and pins through the first and second through holes, and the other end is electrically connected to the signal cable, thereby eliminating the lack of unsightly markings on the traditional black frame.

Description

Improved touch panel black frame structure

This creation relates to the technical category of the structure of the touch panel, especially an improved black frame structure of the touch panel.

One Glass Solution (OGS) is an add-on monolithic glass solution. It has the advantages of simple structure, lightness, thinness, and good light transmission. It also saves the inspection and bonding process of a piece of glass substrate and improves product yield. Therefore, it has been widely used in capacitive touch screens. The structure of the current common OGS touch panel is generally shown in FIGS. 1 to 3. A transparent conductive film 20 with a touch-sensitive pattern is arranged on the bottom of the transparent substrate 10, and a black frame 50 is arranged on the upper peripheral portion thereof. A signal wire layer 70 is arranged on the bottom surface of the black frame portion. The metal wires 71 of the signal wire layer 70 are electrically connected to the pins 25 of the touch-sensitive pattern of the transparent conductive film, and the metal wires 71 are connected to the signal cable (FPC) to transmit the touch sensing signal on the panel to the touch panel. The IC performs signal processing; usually, the upper surface of the transparent substrate 10 is processed by anti-reflection (AR), anti-glare (AG), anti-fingerprint or anti-fouling (AF or AS), and a layer of explosion-proof film is attached to the bottom surface of the whole panel for protection.

Among them, the current black frame 50 mostly uses a black matrix (BM, Black Matrix) material with high impedance characteristics. Usually, the black matrix material is BM ink or BM photoresist formed by mixing carbon black material and resin substrate.

In the structure of the touch panel, the metal wiring 71 and the transparent conductive film 20 are separated by an insulating protective layer 90 to avoid a short circuit caused by misconnection of the wiring, and the metal wiring 71 and the pin 25 of the touch sensing pattern are electrically connected through the conduction of a filled conductive carbon glue 31. The material composition of the filled conductive carbon glue 31 mainly includes graphite, carbon black material and resin substrate. ); in the OGS touch panel structure, the conductive carbon glue layer 30 is arranged on the bottom surface of the black frame 50, but because the black matrix material of the black frame 50 is different from the composition of the conductive carbon glue layer 30 in the proportion of graphite and carbon black material, the blackness of the two materials is also different, so the color difference between the two will cause ugly spots SP on the surface of the black frame, detracting from the aesthetics of the overall touch panel, so it needs to be improved.

The purpose of this creation is mainly to solve the blackness and color difference between the black frame and the conductive carbon layer in the structure of the touch panel, which leads to the problem of unsightly markings on the black frame. An improved black frame structure of the touch panel is proposed, and the black frame is formed by using an insulating carbon material to replace the black frame of the traditional black matrix material.

In order to achieve the above purpose, the invention provides an improved touch panel black frame structure, which includes a transparent substrate; a transparent conductive film, which is arranged on the transparent substrate, and the transparent conductive film has a touch sensing pattern composed of a plurality of sensing electrodes in series, and the sensing electrode series is provided with pins extending to the edge of the transparent substrate; a conductive carbon glue layer, which is arranged on the pins; A through hole; a black frame, which is made of carbon glue material, is arranged on the first transparent insulating layer and is located at the peripheral edge of the transparent substrate, and forms a hollow hole at the corresponding position where the conductive carbon glue layer is set; a second transparent insulating layer, which is covered on the first transparent insulating layer and insulatingly covers the black frame, and forms a second through hole at the corresponding position where the conductive carbon glue layer is set, so that the second through hole is coaxially connected with the first through hole; In the region, the signal wire layer includes a plurality of metal wires, one end of the metal wire is electrically connected to the conductive carbon glue layer and the pin through the first through hole and the second through hole, and the other end of the metal wire is electrically connected to an external signal cable; wherein, preferably, the difference between the blackness value of the conductive carbon glue layer and the blackness value of the carbon glue material of the black frame is below 5%. Most preferably, the material of the conductive carbon glue layer and the carbon glue material of the black frame are the same material composition.

According to the invention, the materials of the first transparent insulating layer and the second transparent insulating layer are selected from one of photoresist, epoxy resin (Epoxy) series, acrylic resin (Acrylic) series and other polymer materials, but the range of implemented materials is not limited to the aforementioned materials.

According to the invention, wherein, the transparent substrate is a plate with dielectric properties and high light transmittance, and its material is selected from one of glass, polycarbonate (PC), polyester (PET), polymethyl methacrylate (PMMA) or cycloolefin copolymer (COC), but the range of implemented materials is not limited to the aforementioned materials, and all kinds of soft, hard or flexible transparent substrates are applicable.

According to the invention, wherein, the material of the transparent conductive film is selected from one of indium tin oxide (ITO), indium zinc oxide (IZO), zinc aluminum oxide (AZO), antimony tin oxide (ATO) or polyethylenedioxythiophene (PEDOT), but the scope of implementation is not limited to the aforementioned materials.

In one embodiment, a filled conductive carbon glue is also included to be filled into the second through hole and the first through hole, so that the filled conductive carbon glue is electrically connected to the metal trace and the conductive carbon glue layer.

This will further clarify other functions and technical features of the creation below, and those skilled in the art can realize the creation according to the description in the text.

The black frame structure of the touch panel of a preferred embodiment of the present invention is described in Fig. 4, but the implementation of the present invention is not limited to these embodiments. In order to provide a clearer description and easier understanding of the technical features of the present invention, each part in the drawing is not drawn according to its relative size, and some dimensions have been exaggerated compared with other relevant scales; irrelevant details are not completely drawn for the sake of simplicity of the drawing.

The improved touch panel black frame structure of the invention includes a transparent substrate 10 , a transparent conductive film 20 , a conductive carbon glue layer 30 , a first transparent insulating layer 40 , a black frame 50 , a second transparent insulating layer 60 and a signal wire layer 70 .

The transparent substrate 10 is a glass plate with dielectric properties and high light transmittance.

The transparent conductive film 20 is an indium tin oxide conductive film, which is disposed on a surface of the transparent substrate 10, and a touch-sensing pattern is provided on the transparent conductive film 20. In this embodiment, a capacitive touch-sensing pattern will be used as an example for illustration, wherein the touch-sensing pattern includes a plurality of rows of Y-axis capacitive sensing series arranged along the Y-axis direction, and a plurality of rows of X-axis capacitive sensing series arranged along the X-axis direction. to the pins 25 at the edge of the transparent substrate 10 .

The conductive carbon glue layer 30 is arranged on the pin 25; wherein, the material composition of the conductive carbon glue layer 30 generally includes components such as graphite, superconducting carbon black, polymer resin, curing agent, accelerator, and solvent, and some metal conductor powders such as gold, silver, and nickel are added. In order to ensure that the material of the conductive carbon glue layer 30 has high conductivity, the weight ratio of graphite and superconducting carbon black materials in the material usually accounts for 10-50%.

The first transparent insulating layer 40 is covered on the transparent conductive film 20 and the conductive carbon glue layer 30 to form a dielectric insulating protective layer, wherein a hollowed-out first through hole 41 is formed at the corresponding position where the conductive carbon glue layer 30 is disposed.

The black frame 50 is arranged on the aforementioned first transparent insulating layer 40, and is located at the peripheral edge of the transparent substrate 10. A hollow hole 51 is formed at the corresponding position where the conductive carbon glue layer 30 is disposed, and the area range of the hollow hole 51 is smaller than the conductive carbon glue layer 30, so that the conductive carbon glue layer 30 can cover the aforementioned hollow hole 51; The difference of the blackness value of the carbon glue material and the conductive carbon glue layer 30 material is below 5%, so as to avoid the obvious color difference between the black frame 50 and the conductive carbon glue layer 30, forming abrupt markings on the black frame 50; preferably, the carbon glue material of the aforementioned black frame 50 and the conductive carbon glue layer 30 are the same material composition, so both have the same blackness value, and there is no color difference between the black frame 50 and the conductive carbon glue layer 30.

The second transparent insulating layer 60 is covered on the aforementioned first transparent insulating layer 40, and covers the black frame 50, so that the black frame 50 is insulated, and forms a hollow second through hole 61 at the corresponding position where the conductive carbon glue layer 30 is disposed, and makes the second through hole 61 communicate with the aforementioned first through hole 41 coaxially; wherein, the aforementioned second transparent insulating layer 60 and the first transparent insulating layer 40 are both used as dielectric insulating protective layers, such as photoresist or epoxy resin polymer material, but not limited to this.

In FIG. 4, the signal wire 70 is set in the area where the aforementioned black frame is covered. The signal wire layer 70 contains plural metal wiring 71, one end of the metal wiring 71 through the aforementioned second -pass hole 61 and the first hole 41 electrical connection to the conductive carbon collagen layer 30, and the other end of the metal wiring 71 is connected to an external signal cable ( It is not displayed on the surface), and the touch sensing signal can be transmitted to the touch IC for signal processing.

5 shows another embodiment of the electrical connection structure between the metal wiring 71 and the conductive carbon glue layer 30, wherein a filled conductive carbon glue 31 is filled in the aforementioned second through hole 61 and the first through hole 41, so that the filled conductive carbon glue 31 is electrically connected between the metal wiring 71 and the conductive carbon glue layer 30.

According to the touch panel structure of this creation, the black frame is formed by insulating carbon glue material to replace the black frame of the traditional black matrix material, so that the black frame and the conductive carbon glue have the same blackness or almost the same blackness, so as to eliminate the lack of unsightly markings on the traditional black frame.

Although the invention has been fully described with reference to the accompanying drawings and in conjunction with specific embodiments, it should be understood that the above-mentioned embodiments are only examples for further description, and the implementation mode of the invention is not limited to this description. Those skilled in the art will understand various changes and modifications, and such changes and modifications should be understood as being included in the scope of the invention defined by the appended patent scope.

10: Transparent substrate 20: Transparent conductive film 25: pin 30: Conductive carbon glue layer 31: Filled with conductive carbon glue 40: The first transparent insulating layer 41: The first through hole 50: black frame 51: hollow holes 60: Second transparent insulating layer 61: Second through hole 70: signal wire layer 71: Metal traces 90: insulating protective layer SP: Zebra

FIG. 1 is a schematic plan view of the front (viewing surface) of a conventional touch panel. FIG. 2 is a schematic plan view of the back of a conventional touch panel. FIG. 3 is a schematic cross-sectional view along the line II-II of FIG. 2 , showing the electrical connection structure between metal traces and touch-sensing pattern pins of a conventional touch panel. FIG. 4 is a schematic cross-sectional view of the present invention, showing the electrical connection structure between metal traces and touch-sensing pattern pins. FIG. 5 is a schematic cross-sectional view of another embodiment of the present invention, illustrating the electrical connection structure between metal traces and touch-sensing pattern pins.

10: Transparent substrate

20: Transparent conductive film

25: pin

30: Conductive carbon glue layer

40: The first transparent insulating layer

41: The first through hole

50: black frame

51: hollow holes

60: Second transparent insulating layer

61: Second through hole

70: signal wire layer

71: Metal traces

Claims (8)

An improved touch panel black frame structure, including: a transparent substrate; A transparent conductive film, which is arranged on the transparent substrate, the transparent conductive film has a touch sensing pattern composed of a plurality of sensing electrode series, and the sensing electrode series is provided with pins extending to the edge of the transparent substrate; a conductive carbon glue layer, which is arranged on the pin; A first transparent insulating layer, which is covered on the transparent conductive film and the conductive carbon glue layer, and forms a first through hole at the corresponding position where the conductive carbon glue layer is disposed; A black frame, which is made of carbon glue material, is arranged on the first transparent insulating layer and is located on the peripheral edge of the transparent substrate, and forms a hollow hole at the corresponding part where the conductive carbon glue layer is arranged; A second transparent insulating layer, which covers the first transparent insulating layer and insulates and covers the black frame, and forms a second through hole at the corresponding position where the conductive carbon glue layer is disposed, so that the second through hole is coaxially connected with the first through hole; A signal wire layer, which is arranged in the area covered by the black frame, the signal wire layer includes a plurality of metal wires, one end of the metal wire is electrically connected to the conductive carbon layer and the pin through the first through hole and the second through hole, and the other end of the metal wire is electrically connected to an external signal cable. The improved black frame structure of the touch panel as claimed in claim 1, wherein the difference between the blackness value of the conductive carbon glue layer and the blackness value of the carbon glue material of the black frame is below 5%. The improved black frame structure of the touch panel according to claim 2, wherein the material of the conductive carbon glue layer is the same material composition as the carbon glue material of the black frame. The improved black frame structure of the touch panel according to Claim 1, wherein the material of the first transparent insulating layer and the second transparent insulating layer is photoresist. The improved black frame structure of the touch panel according to claim 1, wherein the materials of the first transparent insulating layer and the second transparent insulating layer are selected from one of epoxy resin-based polymer materials and acrylic resin-based polymer materials. The improved black frame structure of the touch panel according to claim 1, wherein the transparent substrate is a plate with dielectric properties and high light transmittance, and its material is selected from one of glass, polycarbonate resin, polyester, polymethyl methacrylate or cycloolefin copolymer. The improved black frame structure of the touch panel according to claim 1, wherein the material of the transparent conductive film is selected from one of indium tin oxide, indium zinc oxide, zinc aluminum oxide, tin antimony oxide or polyethylenedioxythiophene. The improved black frame structure of the touch panel according to claim 1, further comprising a filled conductive carbon glue filled into the second through hole and the first through hole, so that the filled conductive carbon glue is electrically connected to the metal wiring and the conductive carbon glue layer.

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