TWI427524B - Touch panel - Google Patents

Description

touch screen

The invention relates to a touch screen.

In recent years, with the development of high performance and diversification of various electronic devices such as mobile phones and touch navigation systems, electronic devices in which light-transmitting touch panels are mounted in front of various display devices (such as liquid crystal displays) are gradually being developed. increase. The user of such an electronic device can visually check the display content of the display element located on the back surface of the touch panel by pressing the touch panel by a finger or a pen, thereby operating various functions of the electronic device.

A capacitive touch screen is a type of touch screen that is common in previous touch screens. The previous capacitive touch screen includes a capacitor structure formed by two layers of ITO film and an insulating layer. When the finger touches the touch screen, it interferes with the electric field between the two layers of ITO film, thereby changing the capacitance value of the capacitor structure, and the driving circuit and the reading circuit detect the change of the capacitance value, thereby being able to locate the touch point. The ITO film of the multi-point capacitive touch screen needs to be patterned, that is, the upper and lower ITO films need to be separately patterned to realize multi-touch of the capacitive touch screen. However, the ITO patterning method mainly uses semiconductor manufacturing techniques such as lithography, exposure, etching, and the like. Since the steps must be complicatedly performed in the preparation process, the yield of the touch screen is low, and the manufacturing cost is also high.

Therefore, it is necessary to provide a touch screen with high yield, simple preparation, and low cost.

A touch screen includes: an insulating layer having opposite first and second surfaces; a first transparent conductive layer, the first transparent conductive layer comprising a plurality of strip-shaped transparent conductive structures parallel to a first The direction is disposed on the first surface of the insulating layer; wherein the touch screen further comprises a second transparent conductive layer disposed on a second surface of the insulating layer, the second transparent conductive layer has resistance anisotropy, and the resistance of the second transparent conductive layer in a second direction is much smaller than that of other directions; further, the second transparent The conductive layer comprises a carbon nanotube layer, the carbon nanotube layer comprising a plurality of carbon nanotubes, the plurality of carbon nanotubes extending in an axial direction in a preferred orientation, the first direction and the second The directions are perpendicular to each other, and the strip-shaped transparent conductive structure is a mesh-shaped conductive structure.

Compared with the prior art, the second transparent conductive layer of the touch screen provided by the present invention comprises a carbon nanotube layer, and the carbon nanotubes in the carbon nanotube layer are preferentially oriented in the same direction, and the nano carbon is extended. The tube layer has the characteristics of resistance anisotropy, and does not need to be etched to form a patterned structure. Therefore, it is not necessary to graphically process the upper and lower transparent conductive layers, so the method for manufacturing the touch screen is relatively simple and low in cost, and Increased product yield.

The touch screen provided by the present technical solution will be described in detail below with reference to the accompanying drawings.

Referring to FIG. 1 , a touch screen 10 according to a first embodiment of the present invention includes a first transparent conductive layer 14 , and a second transparent conductive layer 16 disposed between the first transparent conductive layer 14 and the second transparent conductive layer 16 . The insulating layer 12. The insulating layer 12 includes a first surface (not labeled) and a second surface (not labeled) opposite the first surface. The first transparent conductive layer 14 is disposed on the first surface of the insulating layer 12 , and the second transparent conductive layer 16 is disposed on the second surface of the insulating layer 12 .

The insulating layer 12 has a planar structure and mainly functions as an insulating load, and should have good light transmittance. The insulating layer 12 may be formed of a hard material such as glass, quartz, diamond, or a flexible material such as plastic or resin. Specifically, when the insulating layer 12 is formed of a flexible material, the material may be selected from the group consisting of polycarbonate (PC), polymethyl methacrylate (PMMA), and polyethylene terephthalate (PET). Polyester materials, as well as polyether oxime (PES), cellulose esters, benzocyclobutene (BCB), polyvinyl chloride (PVC) or acrylic Materials such as resins. In this embodiment, the insulating layer 12 is made of glass and has a thickness of 2 mm. It is to be understood that the material forming the insulating layer 12 is not limited to the materials listed above, and it is within the scope of the present invention as long as the insulating layer 12 can function as an insulating carrier and has a good transparency.

Referring to FIG. 2, the first transparent conductive layer 14 includes a plurality of strip-shaped transparent conductive structures 142 spaced apart from each other. The strip-shaped transparent conductive structure 142 has a longitudinal direction (referred to as an extending direction in the present specification) and a width direction as a whole, and the end of the strip-shaped transparent conductive structure 142 referred to in the present specification means an end portion in the extending direction. The material of the strip-shaped transparent conductive structure 142 is ITO or a conductive polymer. The plurality of strip-shaped transparent conductive structures 142 are parallel to each other and equally spaced. The distance between the adjacent two strip-shaped transparent conductive structures 142 is 5 micrometers to 7 millimeters, so that the transparent conductive layer can position the touch points with higher precision, preferably, the adjacent two strips are transparently conductive. The distance between structures 142 is from 20 microns to 30 microns. Each of the strip-shaped transparent conductive structures 142 has the same width, preferably from 1 mm to 8 mm, preferably from 4 mm to 8 mm.

Each of the strip-shaped transparent conductive structures 142 is a mesh-shaped conductive structure. In this embodiment, each strip-shaped transparent conductive structure 142 includes two edge lines 1420 and a plurality of first linear structures 1422 and a plurality of second linear structures 1424 disposed between the two edge lines 1420. The plurality of first linear structures 1422 and the plurality of second linear structures 1424 cross each other and are electrically connected to each other. The plurality of first linear structures 1422 and the plurality of second linear structures 1424 respectively intersect the two edge lines 1420 and are electrically connected to each other. The two edge lines 1420 are parallel to each other. The plurality of first linear structures 1422 are parallel to each other, and the distance between the adjacent two first linear structures 1422 is equal to 5 micrometers to 2 millimeters. The plurality of second linear structures 1424 are parallel to each other, and the distance between the adjacent two second linear structures 1424 is equal, ranging from 5 micrometers to 2 millimeters. The distance between the plurality of first linear structures 1422 and the plurality of second linear structures 1424 may be equal. The plurality of first linear structures 1422 And intersecting the plurality of second linear structures 1424 to form a grid-like structure, the grid-like structure including a plurality of meshes. Each mesh is surrounded by two first linear structures 1422 and two second linear structures 1424; or is surrounded by two first linear structures 1422, a second linear structure 1424 and an edge line 1420. Or surrounded by a first linear structure 1422, two second linear structures 1424, and an edge line 1420. The edge line 1420, the first linear structure 1422, and the second linear structure 1424 have the same diameter and are 5 micrometers to 2 millimeters. In this embodiment, the strip-shaped transparent conductive structure 142 is a mesh-shaped conductive structure composed of a plurality of ITO lines, the strip-shaped transparent conductive structure 142 has a width of 5 mm, and two adjacent strip-shaped transparent conductive structures 142 The distance between the edge line 1420, the first linear structure 1422 and the second linear structure 1424 is 20 micrometers, and the distance between the first linear structures 1422 is 20 micrometers, and the second linear structure 1424 The distance between them is 20 microns. The first linear structure 1422 and the second linear structure 1424 are perpendicular to each other, the angle between the first linear structure 1422 and the edge line 1420 is 45 degrees, and the angle between the second linear structure 1424 and the edge line 1420 is 45. degree.

The first transparent conductive layer 14 further includes a plurality of first electrodes 144 electrically connected to the plurality of strip-shaped transparent conductive structures 142, respectively. The first electrode 144 has a dot structure. Each of the first electrodes 144 corresponds to a strip-shaped transparent conductive structure 142 and is disposed at one end of the strip-shaped transparent conductive structure 142. Each of the first electrodes 144 may be disposed on the insulating layer 12 and electrically connected to a strip-shaped transparent conductive structure 142. Each of the first electrodes 144 may also be disposed on a surface of a strip-shaped transparent conductive structure 142 and located at one end of the strip-shaped transparent conductive structure 142. It can be understood that each strip-shaped transparent conductive structure 142 has opposite ends in its extending direction, a first end (not labeled) and a second end (not labeled). A first electrode 144 may be disposed at a first end of the strip-shaped transparent conductive structure 142 or at a second end of the strip-shaped transparent conductive structure 142. The manner in which the plurality of first electrodes 144 are arranged includes three kinds of situations In the first case, the plurality of first electrodes 144 are respectively disposed at the first end of the strip-shaped transparent conductive structure 142. In the second case, the plurality of first electrodes 144 may also be respectively disposed on the corresponding ones. The first end of the strip-shaped transparent conductive structure 142 is respectively disposed at the second end of the corresponding strip-shaped transparent conductive structure 142; in the third case, the first end and the second end of each strip-shaped transparent conductive structure 142 A first electrode 144 is disposed on each end. When the first electrode 144 is disposed according to the second case, the touch screen 10 may be respectively routed from two opposite sides of the first transparent conductive layer 14, that is, the first electrode 144 may be from the first transparent conductive layer 14. External circuits are connected to the two opposite sides to prevent a wider trace width when routing from one side. The first electrode 144 is disposed in the third case, and is applicable to the case where the length of the strip-shaped transparent conductive structure 142 is long. When the first end and the second end of each strip-shaped transparent conductive structure 142 are respectively provided with a first The electrode 144, the two first electrodes 144 can be connected to an external circuit. Each of the first electrodes 144 may be a conductive film, and the material of the conductive film may be pure metal, alloy, indium tin oxide (ITO), antimony tin oxide (ATO), conductive silver paste, conductive polymer or conductivity. Carbon nanotubes, etc. The metal may be aluminum, copper, tungsten, molybdenum, gold, titanium, rhodium, palladium or iridium, and the alloy may be an alloy of any combination of the above pure metal materials. In this embodiment, the first electrode 144 is formed by a plurality of dot structures formed by conductive silver paste printing, and is disposed at the same end of the strip-shaped transparent conductive structure 142 and disposed on the surface of the strip-shaped transparent conductive structure 142.

Referring to FIG. 3, the second transparent conductive layer 16 is a resistive transparent conductive film, that is, the second transparent conductive layer 16 has different resistivities in different directions in a two-dimensional space. The resistivity ρ _{1 of} the second transparent conductive layer 16 in the first direction L1 is greater than the resistivity ρ _{2 thereof} in the second direction L2, and the first direction L1 is perpendicular to the second direction L2. The first direction L1 is parallel to the extending direction of the strip-shaped transparent conductive structure 142, that is, the strip-shaped transparent conductive structure 142 is disposed on the first surface of the insulating layer 12 parallel to the first direction.

The second transparent conductive layer 16 includes a carbon nanotube layer 162 formed by directly attaching at least one self-supporting carbon nanotube film to the second surface of the insulating layer 12. The carbon nanotube layer 162 may be a layer of carbon nanotube film or a plurality of laminated carbon nanotube films, and the thickness of the carbon nanotube layer 162 is preferably 0.5 nm to 1 mm. Preferably, the carbon nanotube layer 162 has a thickness of from 100 nm to 0.1 mm. It can be understood that when the transparency of the carbon nanotube layer 162 is related to the thickness of the carbon nanotube layer 162, when the thickness of the carbon nanotube layer 162 is small, the transmittance of the carbon nanotube layer 162 is better. The transparency of the carbon nanotube layer can reach more than 90%.

Referring to FIG. 4, the carbon nanotube film includes a plurality of carbon nanotubes connected to each other by van der Waals force. The plurality of carbon nanotubes extend substantially in the same direction. Moreover, the overall direction of extension of the majority of the carbon nanotubes is substantially parallel to the surface of the carbon nanotube film. Further, each of the plurality of carbon nanotubes extending substantially in the same direction in the carbon nanotube film is connected end to end with a carbon nanotube adjacent to the extending direction by van der Waals force . Specifically, each of the carbon nanotubes in the majority of the carbon nanotube membranes extending in the same direction and the carbon nanotubes adjacent in the extending direction are connected end to end by van der Waals force. Of course, there are a few randomly arranged carbon nanotubes in the carbon nanotube film, and these carbon nanotubes do not significantly affect the overall orientation of most of the carbon nanotubes in the carbon nanotube film. The self-supporting carbon nanotube film does not require a large-area carrier support, but can maintain a self-membrane state as long as the supporting force is provided on both sides, that is, the carbon nanotube film is placed (or fixed on) When the two supports are disposed at a fixed distance, the carbon nanotube film located between the two supports can be suspended to maintain the self-membrane state. The self-supporting is mainly achieved by the presence of continuous carbon nanotubes extending through the end-to-end extension of the van der Waals force in the carbon nanotube film.

The carbon nanotube film has a thickness of 0.5 nm to 100 μm, and the width and the length are not limited, and are set according to the size of the second substrate 140. Specific structure of the carbon nanotube film For the preparation method, please refer to Taiwan Patent Application No. I327177, which was filed on February 12, 1999 by Fan Shoushan and others in the Republic of China on July 12, 1999. To save space, reference is made only to this, but all technical disclosures of the application should also be considered as part of the disclosure of the technology of the present application.

In this embodiment, the carbon nanotubes in the carbon nanotube layer 162 are arranged in a preferred orientation along the second direction L2. The preferential orientation of the carbon nanotubes described in the present specification in the second direction L2 means that the extending direction of most of the carbon nanotubes is parallel to the second direction L2. The carbon nanotube layer 162 has the characteristic of electrical resistance anisotropy, that is, the electrical resistivity of the carbon nanotube layer in the direction in which the carbon nanotube extends is much smaller than the electrical resistivity in the direction perpendicular to the direction in which the carbon nanotube extends. Specifically, as shown in FIG. 3, the resistivity ρ _{1 of} the second transparent conductive layer 16 in the first direction L1 is much larger than the resistivity ρ ₂ in the second direction L2.

The second transparent conductive layer 16 further includes a plurality of second electrodes 164 electrically connected to the carbon nanotube layer 162. The plurality of second electrodes 164 are evenly arranged in the first direction L1. The plurality of second electrodes 164 may be disposed on the second surface of the insulating layer 12 and electrically connected to one end of the carbon nanotubes in the extending direction of the carbon nanotube layer 162. The plurality of second electrodes 164 may be disposed on the surface of the carbon nanotube layer 162 and located at one end of the carbon nanotube layer 162 in the direction in which the carbon nanotubes extend. The carbon nanotube layer 162 has opposite ends in the extending direction of the carbon nanotube. It can be understood that the arrangement of the plurality of second electrodes 164 includes three cases: in the first case, the plurality of second electrodes 164 are each located at one end of the carbon nanotube layer 162; in the second case, a portion of the second electrode 164 is disposed at one end of the carbon nanotube layer 162, and the other portion of the second electrode 164 is disposed at The other end of the carbon nanotube layer 162; in the third case, the second electrode 164 is disposed at each end of the carbon nanotube layer 162, and the number of the second electrodes 164 at both ends of the carbon nanotube layer 162 is the same And one-to-one correspondence. The second electrode 164 has a dot structure. Each of the second electrodes 164 may be a conductive film, and the material of the conductive film may be pure metal, alloy, or indium. Tin oxide (ITO), antimony tin oxide (ATO), conductive silver paste, conductive polymer or conductive carbon nanotubes. The metal may be aluminum, copper, tungsten, molybdenum, gold, titanium, rhodium, palladium or iridium, and the alloy may be an alloy of any combination of the above pure metal materials. In this embodiment, the second electrode 164 is a plurality of dot structures formed by printing a conductive silver paste, and is located at the same end of the carbon nanotube layer 162 and disposed on the surface of the carbon nanotube layer 162.

Optionally, in order to protect the first transparent conductive layer 14 and the second transparent conductive layer 16, a transparent protective layer may be disposed on the surface of the first transparent conductive layer 14 or/and the second transparent conductive layer 16 (not shown). The material of the transparent protective layer may be the same as the material of the insulating layer 12. The transparent protective layer has a thickness of about 10 microns to 1 mm. The transparent protective layer only temporarily protects the touch screen, and the transparent protective layer can be removed when the touch screen is applied to a specific product.

The touch screen 10 further includes a driving circuit 20 and a reading circuit 30. The drive circuit 20 is a scan terminal, and the read circuit 30 serves as a read terminal. The plurality of first electrodes 144 are electrically connected to the driving circuit 20, and the plurality of second electrodes 164 are electrically connected to the reading circuit 30. Alternatively, the plurality of first electrodes 144 may be electrically connected to the read circuit 30, and the plurality of second electrodes 164 are electrically connected to the drive circuit 20. In this embodiment, the plurality of first electrodes 144 are electrically connected to the driving circuit 20, and the plurality of second electrodes 164 are electrically connected to the reading circuit 30.

In the embodiment, the first transparent conductive layer 14 of the touch screen 10 is adjacent to the touch surface or the second transparent conductive layer 16 is adjacent to the touch surface. In this embodiment, the first transparent conductive layer 14 is adjacent to the touch surface. The user touches by a touch object such as a finger or a hand-held conductive pen. When the touch object touches the touch screen 10, that is, when it touches the first transparent conductive layer 14, the electric field between the first transparent conductive layer 14 and the second transparent conductive layer 16 is disturbed, thereby changing the first transparent The value of the coupling capacitance between the conductive layer 14 and the second transparent conductive layer 16 can be determined according to the magnitude and position of the change in the capacitance value. position. Referring to FIG. 5, the scanning end includes m scanning lines. The number of scanning lines is the same as the number of the first electrodes 144. Each scanning line is connected to a first electrode, and the reading end includes n reading lines. The read lines are connected to a second electrode 164, and the number of read lines is the same as the number of the second electrodes 164. When the square wave signals are sequentially input to the m first electrodes by the m scan lines, for each of the first electrodes 144, the read circuit 30 can read n values from the n second electrodes 164. After one cycle of scanning, the read circuit 30 can read m x n values. By comparing the m×n values statistically, the position of the touched point can be obtained. When there are a plurality of touch points, since each touch point corresponds to a different first electrode 144 or a different second electrode 164, the position of each touch point can also be detected.

The touch screen 10 provided in this embodiment has the following advantages: First, the touch screen 10 of the present invention uses a carbon nanotube layer including an ordered arrangement of carbon nanotubes as the second transparent conductive layer 16, and the nano-carbon nanotube layer The carbon nanotubes are arranged in the same direction, and the carbon nanotube layer can be characterized by resistance anisotropy without patterning, and the process is simple. At the same time, because the carbon nanotube layer replaces the patterned ITO layer, The preparation process of the second transparent conductive layer 16 is non-polluting, and no complicated process is required, which further simplifies the process of the touch screen 10, so that the yield of the touch screen 10 is higher, and the cost of the touch screen 10 is further reduced; secondly, because each strip is transparent The conductive structure 142 is a mesh-shaped conductive structure composed of an edge line 1420, a first linear structure 1422 and a second linear structure 1424, such that the strip-shaped transparent conductive structure 142 and the carbon nanotube layer 162 intersect each other on a unit touch area. The stacked area is small and has a small coupling capacitance. Since the touch screen 10 works by changing the coupling capacitance value between the first transparent conductive layer 14 and the second transparent conductive layer 16, According to the magnitude and position of the change of the capacitance value, the position of the touch point can be determined. When the value of the coupling capacitance is small, the ratio of the change of the capacitance value to the original coupling capacitance value is larger, and therefore, the change of the capacitance value is more Easy to detect, improves the sensitivity of the touch screen; finally, because the carbon nanotubes are excellent Different conductivity properties, therefore, using a carbon nanotube layer as a transparent conductive layer, the transparent conductive layer can have a uniform resistance distribution, thereby improving the resolution and accuracy of the touch screen and the touch display device using the touch screen.

A second embodiment of the present invention provides a touch screen. The structure of the touch screen is substantially the same as that of the first embodiment. The difference is in the structure of the second transparent conductive layer.

Referring to FIG. 6, the second transparent conductive layer 26 of the touch screen of the present embodiment includes a plurality of mutually spaced strip-shaped carbon nanotube structures 262. The plurality of mutually spaced ribbon-shaped carbon nanotube structures 262 are obtained by cutting a carbon nanotube layer. The structure of the cut carbon nanotube layer is the same as that of the carbon nanotube layer disclosed in the first embodiment. Therefore, the arrangement of the carbon nanotubes in each of the strip-shaped carbon nanotube structures 262 is the same as that of the first embodiment. The carbon nanotubes in the carbon nanotube layer disclosed in one embodiment are arranged in the same manner. The ribbon-shaped carbon nanotube structures 262 are evenly arranged, and the distance between adjacent two ribbon-shaped carbon nanotube structures 262 is equal, ranging from 5 micrometers to 7 millimeters. Each of the ribbon-shaped carbon nanotube structures 262 has an equal width of from 3 mm to 8 mm. The second transparent conductive layer 26 further includes a plurality of second electrodes 264, and the plurality of second electrodes 264 are disposed in one-to-one correspondence with the strip-shaped carbon nanotube structures 262. The plurality of second electrodes 264 are evenly arranged in the first direction L1.

The third embodiment of the present invention provides a touch screen. The touch screen provided in this embodiment is basically the same as the touch screen 10 provided in the first embodiment, except that the structure of the first transparent conductive layer is different.

Referring to FIG. 7, the first transparent conductive layer 34 includes a plurality of strip-shaped transparent conductive structures 342 spaced apart from each other. Each strip-shaped transparent conductive structure 342 includes two edge lines 3420 and a plurality of first linear structures 3422 disposed between the two edge lines 3420. The first linear structure 3422 and the second linear structure 3424 are perpendicular to each other, and the first linear structure 3422 and the edge line 3420 are perpendicular to each other, and the second linear junction The structure 3424 and the edge line 3420 are parallel to each other. The other structure of the first transparent conductive layer 34 is the same as that of the first transparent conductive layer 14 provided in the first embodiment.

The fourth embodiment of the present invention provides a touch screen. The touch screen provided in this embodiment is basically the same as the touch screen 10 provided in the first embodiment, except that the structure of the strip-shaped transparent conductive structure in the first transparent conductive layer is different.

Referring to FIG. 8, the first transparent conductive layer 44 includes a plurality of strip-shaped transparent conductive structures 442 spaced apart from each other. Each strip-shaped transparent conductive structure 442 includes two edge lines 4420 and a plurality of linear structures 4422 disposed between the two edge lines 4420. The plurality of linear structures 4422 and the two edge lines 4420 cross each other and are electrically connected to each other to form a mesh conductive structure. The mesh conductive structure includes a plurality of meshes surrounded by two adjacent linear structures 4422 and the two edge lines 4420. The plurality of linear structures 4422 are parallel to each other and evenly spaced apart by a certain distance. The angle between the extending direction of the plurality of linear structures 4422 and the extending direction of the two edge lines 4420 is greater than 0 degrees and less than or equal to 90 degrees. The distance between two adjacent linear structures 4422 is 5 micrometers to 2 millimeters. The linear structure 4422 has a diameter of 5 micrometers to 2 millimeters. Each of the strip-shaped transparent conductive structures 442 has the same width, approximately 3 mm to 8 mm, preferably 4 mm to 6 mm. The distance between the adjacent two strip-shaped transparent conductive structures 442 is 5 micrometers to 7 millimeters, so that the transparent conductive layer can position the touch points with higher precision, preferably, the adjacent two strips are transparently conductive. The distance between structures 442 is from 20 microns to 30 microns. In this embodiment, the linear structure 4422 and the two edge lines 4420 are perpendicular to each other, and the distance between the adjacent two linear structures 4422 is 20 micrometers.

The fifth embodiment of the present invention provides a touch screen. The touch screen provided in this embodiment has substantially the same structure as the touch screen 10 provided in the first embodiment, except that the structure of the strip-shaped transparent conductive structure in the first transparent conductive layer is different.

Referring to FIG. 9, the first transparent conductive layer 54 includes a plurality of mutually spaced intervals. A strip-shaped transparent conductive structure 542 is disposed. Each strip-shaped transparent conductive structure 542 includes two edge lines 5420 and a plurality of linear structures 5422 disposed between the two edge lines 5420. The plurality of linear structures 5422 and the two edge lines 5420 are parallel to each other. The strip-shaped transparent conductive structure 542 can be regarded as a mesh-shaped conductive structure, and the mesh of the mesh-shaped conductive structure is surrounded by two adjacent linear structures 5422 or surrounded by the edge line 5420 and its adjacent linear structure 5422. to make. The line structure 5422 is evenly distributed with the two edge lines 5420, and the distance between the adjacent two line structures 5422 or the distance between the edge line 5420 and the adjacent line structure 5422 is equal. The edge line 5420 and the linear structure 5422 in each of the strip-shaped transparent conductive structures 542 are electrically connected to a first electrode 544. The distance between two adjacent linear structures 5422 is 5 microns to 2 mm. The linear structure 5422 has a diameter of 5 micrometers to 2 millimeters. Each of the strip-shaped transparent conductive structures 542 has the same width, preferably from 1 mm to 8 mm, preferably from 4 mm to 6 mm. The distance between adjacent two strip-shaped transparent conductive structures 542 is 5 micrometers to 7 millimeters, so that the transparent conductive layer can position the touch points with higher precision, preferably, the adjacent two strips are transparently conductive. The distance between structures 542 is from 20 microns to 30 microns.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

10‧‧‧ touch screen

12‧‧‧Insulation

14,34,44,54‧‧‧First transparent conductive layer

142,342,442,542‧‧‧band transparent conductive structure

1420, 3420, 4420, 5420‧‧‧ edge line

1422,3422‧‧‧First linear structure

1424,3424‧‧‧Second linear structure

144,544‧‧‧first electrode

16,26‧‧‧Second transparent conductive layer

162‧‧‧Nano carbon tube layer

164,264‧‧‧second electrode

20‧‧‧Drive circuit

262‧‧‧Striped carbon nanotube structure

30‧‧‧Read circuit

4422,5422‧‧‧Linear structure

FIG. 1 is a schematic side view of a touch screen provided by a first embodiment of the present invention.

2 is a schematic structural view of the first transparent conductive layer in FIG.

3 is a schematic structural view of a second transparent conductive layer in FIG.

4 is a scanning electron micrograph of a carbon nanotube film in a touch screen provided by a first embodiment of the present invention.

FIG. 5 is a schematic diagram of determining the position of a touch point of the touch screen provided by the first embodiment of the present invention.

FIG. 6 is a schematic structural diagram of a second transparent conductive layer of a touch screen according to a second embodiment of the present invention.

FIG. 7 is a schematic structural diagram of a first transparent conductive layer of a touch screen according to a third embodiment of the present invention.

FIG. 8 is a schematic structural diagram of a first transparent conductive layer of a touch screen according to a fourth embodiment of the present invention.

FIG. 9 is a schematic structural diagram of a first transparent conductive layer of a touch screen according to a fifth embodiment of the present invention.

14‧‧‧First transparent conductive layer

142‧‧‧Strip transparent conductive structure

1420‧‧‧ edge line

1422‧‧‧First linear structure

1424‧‧‧Second linear structure

144‧‧‧First electrode

Claims (17)

A touch screen includes: an insulating layer having opposite first and second surfaces; a first transparent conductive layer, the first transparent conductive layer comprising a plurality of strip-shaped transparent conductive structures parallel to a first The second transparent conductive layer is disposed on the second surface of the insulating layer, and the second transparent conductive layer has a resistive anisotropy. The second transparent conductive layer has a resistance in a second direction that is much smaller than the resistance in other directions; the second transparent conductive layer includes a carbon nanotube layer, and the carbon nanotube layer includes a plurality of carbon nanotubes. The axial direction of the plurality of carbon nanotubes extends in a preferred orientation in a second direction, the first direction and the second direction being perpendicular to each other, and the strip-shaped transparent conductive structure is a mesh-shaped conductive structure. The touch screen of claim 1, wherein the distance between adjacent two strip-shaped transparent conductive structures is 5 micrometers to 7 millimeters. The touch screen of claim 1, wherein each of the strip-shaped transparent conductive structures has the same width and is 1 mm to 8 mm. The touch screen of claim 3, wherein each of the strip-shaped transparent conductive structures has a width of 4 mm to 8 mm. The touch screen of claim 1, wherein the strip-shaped transparent conductive structure comprises two edge lines and a plurality of linear structures disposed between the edge lines, the plurality of linear structures being evenly distributed and The two edge lines are electrically connected. The touch screen of claim 5, wherein the edge line is the same diameter as the linear structure, and is 5 micrometers to 2 millimeters. The touch screen of claim 5, wherein the plurality of linear structures comprise a plurality of first linear structures and a plurality of second linear structures, the plurality of first linear structures being parallel to each other, a plurality of second linear structures are parallel to each other, The plurality of first linear structures and the plurality of second linear structures intersect each other to form a mesh conductive structure, and the mesh conductive structure includes a plurality of meshes. The touch screen of claim 1, wherein the strip-shaped transparent conductive structure comprises two edge lines and a plurality of line structures disposed between the edge lines, the plurality of line structures and the two edge lines Parallel and evenly distributed. The touch screen of claim 8, wherein the distance between the adjacent two first linear structures is equal to 5 micrometers to 2 millimeters, between the adjacent two second linear structures. The distance is equal to 5 microns to 2 mm. The touch screen of claim 9, wherein the distance between the adjacent two first linear structures is equal to the distance between the adjacent two second linear structures. The touch panel of claim 1, wherein the carbon nanotube layer is a pure carbon nanotube structure composed of a plurality of carbon nanotubes. The touch screen of claim 1, wherein the carbon nanotube layer is formed by directly attaching at least one self-supporting carbon nanotube film to a second surface of the insulating layer, Each of the carbon nanotubes in the carbon nanotube film that extends substantially in the same direction is connected end to end with a vanadium tube in the extending direction. The touch screen of claim 1, further comprising a plurality of first electrodes disposed at one end of the first transparent conductive layer in a second direction, each first electrode corresponding to a strip-shaped transparent conductive structure And electrically connected to the strip-shaped transparent conductive structure. The touch screen of claim 13, wherein the plurality of second electrodes are further disposed at one end of the second transparent conductive layer along the first direction. The touch screen of claim 14, further comprising a driving circuit and a reading circuit, wherein the plurality of first electrodes are electrically connected to the driving circuit Then, the plurality of second electrodes are electrically connected to the reading circuit. The touch screen of claim 1, wherein the carbon nanotube layer comprises a plurality of strip-shaped carbon nanotube structures spaced apart and uniformly arranged, and two adjacent strip-shaped carbon nanotube structures The distance between 5 microns and 7 mm. The touch screen of claim 16, wherein each of the strip-shaped carbon nanotube structures has an equal width of from 1 mm to 8 mm.