TWI408575B - Touch panel and displaying device using the same - Google Patents

Abstract

The present invention relates to a touch panel. The touch panel includes a base, and a plurality of electrodes. The transparent conductive layer is disposed on a surface of the base. The electrodes are separately disposed and electrically connected to the transparent conductive layer. The transparent conductive layer includes a carbon nanotube layer. The carbon nanotube layer includes a plurality of carbon nanotube ribbon film structures parallel arranged and separately disposed. Two opposite ends of each carbon nanotube ribbon film structure are respectively connected with two opposite electrodes, and each electrode is electrically connected with one end of at least one carbon nanotube ribbon film structure. Further, the present invention also relates to a displaying device. The displaying device includes a displaying unit and a touch panel.

Description

Touch screen and display device

The invention relates to a touch screen and a display device, in particular to a touch screen using a carbon nanotube as a transparent conductive layer and a display device using the same.

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 a translucent touch panel is mounted on the front surface of a display device such as a liquid crystal are gradually increasing. The user of such an electronic device operates the display content of the display device located on the back surface of the touch panel by visually checking the touch panel while pressing the touch panel by a finger or a pen. Therefore, various functions of the electronic device can be operated.

According to the working principle of the touch screen and the transmission medium, the touch screens in the prior art are divided into four types, namely, resistive, capacitive, infrared, and surface acoustic wave. Among them, the capacitive touch screen is widely used due to its high accuracy and strong anti-interference ability.

Prior art capacitive touch screens (see "Research on Continuous Thin Film Capacitive Touch Screens", Li Shuben et al., Optoelectronics Technology, Vol. 15, p. 62 (1995)) include a glass substrate, a transparent conductive layer, and a plurality of metal electrodes. . In the capacitive touch panel, the material of the glass substrate is soda lime glass. The transparent conductive layer is a transparent material such as indium tin oxide (ITO) or antimony tin oxide (ATO). The electrode is formed by printing a conductive metal (for example, silver) having a low electrical resistance. The electrode spacing is disposed at each corner of the transparent conductive layer. Further, the transparent conductive layer is coated with a protective layer. The defense The sheath is formed by a hardening or densification process of the liquid glass material, followed by heat treatment.

When a touch object such as a finger touches the surface of the touch screen, a coupling capacitance is formed between the touch object such as a finger and the transparent conductive layer in the touch screen due to the human body electric field. For high-frequency currents, the capacitor is a direct conductor, and the touch of a finger or the like will draw a small current from the contact point. This current flows out of the electrodes on the touch screen, respectively, and the current flowing through the four electrodes is proportional to the distance from the finger to the four corners. The touch screen controller obtains the position of the touch point by accurately calculating the ratio of the four currents.

Therefore, the transparent conductive layer is an essential component for the touch screen. In the prior art, the transparent conductive layer usually adopts an ITO layer. However, the ITO layer as a transparent conductive layer has disadvantages such as insufficient mechanical and chemical durability. Further, the use of the ITO layer as the transparent conductive layer has a phenomenon in that the resistance value distribution is uneven, which causes the capacitive touch screen of the prior art to have problems such as low resolution and low precision of the touch screen.

In view of this, it is indeed necessary to provide a touch screen having high resolution, high precision, and durability, and a display device using the touch screen.

A touch screen includes a substrate; a transparent conductive layer disposed on a surface of the substrate; and a plurality of electrodes respectively spaced apart and electrically connected to the transparent conductive layer. Wherein, the transparent conductive layer further comprises a carbon nanotube layer comprising a plurality of carbon nanotube ribbon-like membrane structures consisting of carbon nanotubes arranged in parallel and spaced apart, wherein each of the nano-tubes Two ends of the carbon nanotube film-like film structure are electrically connected to two opposite electrodes, respectively, and each of the electrodes is One end of the carbon nanotube strip film structure is electrically connected.

A display device comprising a touch screen comprising a substrate; a transparent conductive layer disposed on a surface of the substrate; and a plurality of electrodes respectively spaced apart from the transparent conductive layer Electrical connection; a display device disposed adjacent to a surface of the touch screen and away from a surface of the transparent conductive layer. Wherein, the transparent conductive layer further comprises a carbon nanotube layer comprising a plurality of carbon nanotube ribbon-like membrane structures consisting of carbon nanotubes arranged in parallel and spaced apart, wherein each of the nano-tubes Both ends of the carbon nanotube film-like film structure are electrically connected to two opposite electrodes, respectively, and each of the electrodes is electrically connected to one end of at least one of the carbon nanotube film-like film structures.

Compared with the touch screen and the display device of the prior art, the touch screen and the display device provided by the technical solution have the following advantages: First, since the plurality of carbon nanotube film films in the transparent conductive layer are parallel and spaced apart, The transparent conductive layer has good mechanical properties, so that the transparent conductive layer has good mechanical strength and toughness. Therefore, the above-mentioned carbon nanotube film structure can be used as a transparent conductive layer, which can be correspondingly improved. The durability of the touch screen further improves the durability of the display device using the touch screen; secondly, the plurality of carbon nanotube film films in the transparent conductive layer are parallel and spaced apart, so that the transparent conductive layer has uniformity a resistance distribution and a light transmissive property, and each of the electrodes is electrically connected to one end of at least one of the carbon nanotube strip-shaped film structures in the transparent conductive layer, so that the touched point and the carbon nanotube band can be detected The change in current between the two electrodes connected to the membrane structure to more accurately determine the position of the touch point, thereby facilitating the improvement of the touch screen and the use of the touch Screen The resolution and accuracy of the display device.

The technical solution will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 1 , FIG. 2 and FIG. 3 , the touch screen 20 includes a substrate 22 , a transparent conductive layer 24 , a shielding layer 26 and at least a plurality of electrodes 28 . The base 22 has a first surface 221 and a second surface 222 opposite the first surface 221. The transparent conductive layer 24 is disposed on the first surface 221 of the substrate 22; the plurality of electrodes 28 are respectively spaced apart and electrically connected to the transparent conductive layer 24 for forming an equipotential surface on the transparent conductive layer 24. The protective layer 26 can be disposed directly on the transparent conductive layer 24 and the electrode 28. Preferably, the plurality of electrodes 28 are spaced apart at opposite ends of the transparent conductive layer 24.

The base 22 is a curved or planar structure. The base 22 is formed of a hard material such as glass, quartz, diamond or plastic or a flexible material. The base 22 serves primarily as a support.

The transparent conductive layer 24 includes a plurality of carbon nanotube strip film structures 240 arranged in parallel and spaced apart, and the plurality of electrodes are respectively disposed at a transparent conductive layer 24 including a plurality of carbon nanotube strip film structures 240. The opposite ends of the carbon nanotube film structure 240 are respectively electrically connected to two opposite electrodes, and each of the electrodes and at least one of the transparent conductive layers 24 One end of the carbon tube strip film structure 240 is electrically connected. Specifically, the plurality of electrodes 28 are disposed one-to-one correspondingly at both ends of the carbon nanotube film structure 240.

The carbon nanotube film structure 240 is a layer of carbon nanotube film, and the carbon nanotube film comprises a plurality of aligned carbon nanotubes, and the plurality of nano tubes The carbon nanotubes are arranged along the length direction of the carbon nanotube film structure 240. In addition, the carbon nanotube film structure 240 may also be a stacked multi-layered carbon nanotube film, each of which comprises a plurality of aligned carbon nanotubes, and adjacent two layers of carbon nanotubes. The carbon nanotubes in the carbon nanotube film are arranged in the same direction or in different directions. The carbon nanotube film further comprises a plurality of end-to-end carbon nanotube bundle segments, each of the carbon nanotube bundle segments having equal lengths and each of the carbon nanotube bundle segments being composed of a plurality of mutually parallel carbon nanotube bundles The two ends of the plurality of carbon nanotube bundle segments are connected to each other by a van der Waals force. The adjacent carbon nanotube bundles are tightly coupled by a van der Waals force, and the bundle of carbon nanotubes includes a plurality of carbon nanotubes of equal length and arranged in parallel. The carbon nanotubes may be one or more of a single-walled carbon nanotube, a double-walled carbon nanotube, and a multi-walled carbon nanotube. The carbon nanotube film structure has a width of 1 mm to 10 cm. The carbon nanotube ribbon film structure has a thickness of 0.5 nm to 100 μm. The spacing between the carbon nanotube film structures is 5 nm to 1 mm. In this embodiment, the transparent conductive layer 24 includes a plurality of parallel and spaced carbon nanotube film film structures 240. Each of the carbon nanotube strip film structures 240 is a layer of carbon nanotube film. Preferably, the plurality of carbon nanotube films in the transparent conductive layer 24 are disposed in parallel and at equal intervals.

Further, a plurality of carbon nanotube film films in the transparent conductive layer 24 are disposed in parallel and spaced apart. Preferably, the carbon nanotube strip films in the transparent conductive layer 24 are arranged in parallel and at equal intervals, so that the transparent conductive layer 24 has a uniform resistance distribution and light transmission characteristics, and the resolution of the touch screen 20 is improved. And accuracy.

It can be understood that in order to make the touch screen 20 have more uniform transparency, An optical compensation film may be disposed between the spaced carbon nanotube film layers.

The preparation method of the transparent conductive layer 24 of the embodiment of the technical solution mainly comprises the following steps: Step 1: providing a carbon nanotube array formed on a substrate, preferably, the array is a super-sequential carbon nanotube array.

The carbon nanotube array provided by the embodiments of the present technical solution is one of a single-walled carbon nanotube array, a double-walled carbon nanotube array, and a multi-walled carbon nanotube array. The method for preparing the carbon nanotube array adopts a chemical vapor deposition method, and the specific steps thereof include: (a) providing a flat substrate, the substrate may be selected from a P-type or N-type germanium substrate, or a germanium substrate having an oxide layer formed thereon. Preferably, the present embodiment adopts a 4-inch germanium substrate; (b) uniformly forms a catalyst layer on the surface of the substrate, and the catalyst layer material may be selected from iron (Fe), cobalt (Co), nickel (Ni) or any combination thereof. One of the alloys; (c) annealing the substrate on which the catalyst layer is formed in air at 700 ° C to 900 ° C for about 30 minutes to 90 minutes; (d) placing the treated substrate in a reaction furnace in a protective gas atmosphere The mixture is heated to 500 ° C to 740 ° C, and then reacted with a carbon source gas for about 5 minutes to 30 minutes to grow to obtain a carbon nanotube array having a height of about 100 μm. The carbon nanotube array is an array of pure carbon nanotubes formed by a plurality of carbon nanotubes that are parallel to each other and perpendicular to the substrate. The carbon nanotube array is substantially the same area as the above substrate. The super-sequential carbon nanotube array contains substantially no impurities such as amorphous carbon or residual catalyst metal particles, etc., by controlling the growth conditions described above.

In this embodiment, the carbon source gas may be selected from the chemical properties of acetylene, ethylene, methane, and the like. For the more active hydrocarbon, the preferred carbon source gas in this embodiment is acetylene; the shielding gas is nitrogen or an inert gas, and the preferred shielding gas in this embodiment is argon.

It can be understood that the carbon nanotube array provided by the embodiments of the present technical solution is not limited to the above preparation method, and may be a graphite electrode constant current arc discharge deposition method, a laser evaporation deposition method or the like.

Step 2: Pulling a carbon nanotube from the carbon nanotube array using a stretching tool to obtain a carbon nanotube film.

The preparation of the carbon nanotube film specifically includes the following steps: (a) selecting a plurality of carbon nanotube segments of a certain width from the carbon nanotube array, and in this embodiment, preferably contacting the nano tape with a tape having a certain width. The carbon tube array selects a plurality of carbon nanotube bundles of a certain width; (b) stretching the plurality of carbon nanotube bundles at a constant speed along a growth direction substantially perpendicular to the carbon nanotube array growth to form a continuous nanocarbon Tube film.

In the above stretching process, the plurality of carbon nanotube bundles are gradually separated from the substrate in the stretching direction under the tensile force, and the selected plurality of carbon nanotube bundles are respectively combined with other nanocarbons due to the van der Waals force. The tube bundles are continuously pulled out end to end to form a carbon nanotube film. The carbon nanotube film comprises a plurality of carbon nanotube bundles connected end to end and oriented. The arrangement of the carbon nanotubes in the carbon nanotube film is substantially parallel to the stretching direction of the carbon nanotube film.

Referring to FIG. 4, the carbon nanotube film is a carbon nanotube film having a certain width formed by connecting a plurality of carbon nanotube bundles arranged in a preferential orientation. The preferentially oriented carbon nanotube film obtained by direct stretching is more than the disordered naphthalene The carbon nanotube film has better uniformity, that is, has a more uniform thickness and has more uniform electrical conductivity. At the same time, the direct stretching method for obtaining the carbon nanotube film is simple and rapid, and is suitable for industrial application.

In this embodiment, the width of the carbon nanotube film is related to the size of the substrate on which the carbon nanotube array is grown and the width of the selected carbon nanotube segment, and the length of the carbon nanotube film is not limited. According to actual needs. When the carbon nanotubes in the carbon nanotube film are one or more of a single-walled carbon nanotube, a double-walled carbon nanotube, and a double-walled carbon nanotube. The single-walled carbon nanotube has a diameter of 0.5 nm to 50 nm. The double-walled carbon nanotube has a diameter of 1.0 nm to 50 nm. The multi-walled carbon nanotube has a diameter of 1.5 nm to 50 nm.

Step 3: preparing a plurality of the above-mentioned carbon nanotube film to form a carbon nanotube film structure, and laying the carbon nanotube film structure in parallel and at intervals on the surface of the substrate 22, thereby forming the Transparent conductive layer 24.

The carbon nanotube film structure 240 is a carbon nanotube film or a plurality of carbon nanotube films arranged in an overlapping manner. The arrangement of the carbon nanotubes in the adjacent two layers of the carbon nanotube film in the plurality of stacked carbon nanotube films is not limited, and may be arranged in the same direction or in different directions. The arrangement distance between the carbon nanotube film-like film structures 240 is 5 nm to 1 mm, which can be selected according to the light transmittance of the touch screen 20.

Since the carbon nanotube in the super-sequential carbon nanotube array of the present embodiment is very pure, and since the specific surface area of the carbon nanotube itself is very large, the carbon nanotube film itself has strong viscosity. Therefore, the carbon nanotube film structure composed of the carbon nanotube film can be used as the transparent conductive layer 24 Attached to the surface of the substrate 22.

Alternatively, the above-described carbon nanotube film structure 240 adhered to the substrate 22 may be treated with an organic solvent. Specifically, the entire carbon nanotube film structure 240 can be infiltrated by the surface of the carbon nanotube film structure 240 by dropping an organic solvent through a test tube. The organic solvent is a volatile organic solvent such as ethanol, methanol, acetone, dichloroethane or chloroform, and ethanol is used in this embodiment. After the carbon nanotube ribbon film structure 240 is infiltrated by an organic solvent, the carbon nanotube film structure can be firmly attached to the surface of the substrate under the action of the surface tension of the volatile organic solvent, and the surface volume is The ratio is reduced, the viscosity is lowered, and the mechanical strength and toughness are good.

In addition, the plurality of carbon nanotube films can also be prepared by using a stretching tool to pull a carbon nanotube from the carbon nanotube array to obtain a larger size carbon nanotube film; The carbon nanotube film is cut into a plurality of carbon nanotube films of equal size and size.

It can be understood that the preparation of the carbon nanotube film provided by the embodiments of the present technical solution is not limited to the above preparation method, and a carbon nanotube film can also be prepared by a rolling method, and the plurality of naphthalene films in the carbon nanotube film are The carbon nanotubes are arranged in the same direction, arranged in different directions or arranged in the same order. In addition, a carbon nanotube film can be prepared by a flocculation method, and the carbon nanotube film comprises a plurality of intertwined carbon nanotubes.

In addition, the plurality of electrodes are respectively disposed at opposite ends of the transparent conductive layer 24, and two ends of each of the carbon nanotube strip-shaped film structures are respectively electrically connected to two opposite electrodes, and the Each electrode is electrically connected to one end of at least one of the carbon nanotube strip film structures in the transparent conductive layer 24. Pick up. Specifically, the plurality of electrodes 28 are disposed one-to-one correspondingly at both ends of the carbon nanotube film structure.

It can be understood that the shapes of the transparent conductive layer 24 and the base 22 can be selected according to the shape of the touch area of the touch screen 20. For example, the touch area of the touch screen 20 may be a long line touch area having a length, a triangular touch area, a rectangular touch area, or the like. In this embodiment, the touch area of the touch screen 20 is a rectangular touch area.

For the rectangular touch area, the shape of the transparent conductive layer 24 and the base 22 may also be rectangular. In order to form a uniform resistance network on the transparent conductive layer 24 described above, a plurality of electrodes 28 are symmetrically disposed on the surface of the transparent conductive layer 24, respectively. The plurality of electrode electrodes 28 may be formed of a metal material. Specifically, in the present embodiment, the base 22 is a glass substrate, and the plurality of electrodes 28 are strip electrodes 28 composed of a low-resistance conductive metal plating such as silver or copper or a metal foil. The plurality of electrodes 28 are spaced apart on opposite sides of the same surface of the transparent conductive layer 24. It can be understood that the above-mentioned electrodes 28 can also be disposed on different surfaces of the transparent conductive layer 24. The key point is that the electrodes 28 are disposed such that an equipotential surface is formed on the transparent conductive layer 24. In this embodiment, the electrode 28 is disposed on a surface of the transparent conductive layer 24 away from the substrate. The electrode 28 may be directly formed on the transparent conductive layer 24 by a deposition method such as sputtering, electroplating, or electroless plating. Alternatively, the above electrode 28 may be bonded to one surface of the transparent conductive layer 24 by a conductive adhesive such as silver paste.

It can be understood that the electrode 28 can also be disposed between the transparent conductive layer 24 and the substrate 22 and electrically connected to the transparent conductive layer 24, and is not limited to the above arrangement and bonding manner. As long as the above electrode 28 can be transparently conductive The manner in which electrical connections are made between layers 24 is within the scope of the present invention.

Further, in order to extend the service life of the transparent conductive layer 24 and limit the capacitance coupled between the contact point and the transparent conductive layer 24, a transparent protective layer 26 may be disposed on the transparent conductive layer 24 and the electrode, and the protective layer 26 may be It is formed of tantalum nitride, cerium oxide, benzocyclobutene (BCB), a polyester film or an acrylic resin. The protective layer 26 has a certain hardness and protects the transparent conductive layer 24. It will be appreciated that processing may also be performed by a special process such that the protective layer 26 has the following functions, such as reducing glare, reducing reflection, and the like.

In the present embodiment, a ruthenium dioxide layer is disposed on the transparent conductive layer 24 on which the electrode 28 is formed as the protective layer 26, and the hardness of the protective layer 26 reaches 7H (H is the Rockwell hardness test, and the main test is performed. After the force, the depth of the indentation remains under the initial test force). It will be appreciated that the hardness and thickness of the protective layer 26 can be selected as desired. The protective layer 26 can be directly bonded to the transparent conductive layer 24 by an adhesive.

Furthermore, in order to reduce the electromagnetic interference generated by the display device and to avoid errors in the signal emitted from the touch screen 20, a shielding layer 25 may also be provided on the second surface 222 of the substrate 22. The shield layer 25 may be formed of a transparent conductive material such as an indium tin oxide (ITO) film, an antimony tin oxide (ATO) film, or a carbon nanotube film. The carbon nanotube film can be a aligned or otherwise structured carbon nanotube film. In this embodiment, the carbon nanotube film comprises a plurality of carbon nanotubes, and the plurality of carbon nanotubes are aligned in the above-mentioned carbon nanotube film, and the specific structure thereof may be the same as that of the transparent conductive layer 24. The carbon nanotube film acts as an electrical grounding point and acts as a shield Thus, the touch screen 20 can operate in a non-interfering environment.

Referring to FIG. 5 , and in conjunction with FIG. 2 , the embodiment of the present invention provides a display device 100 . The display device 100 includes a touch screen 20 and a display device 30 . The display device 30 is disposed directly adjacent to the touch screen 20. Further, the display device 30 described above is disposed adjacent to and adjacent to the second surface 222 of the base 22 of the touch screen 20. The display device 30 described above and the touch screen 20 may be spaced apart by a predetermined distance or integrated.

The display device 30 may be one of display devices such as a liquid crystal display, a field emission display, a plasma display, an electroluminescence display, a vacuum fluorescent display, and a cathode ray tube.

Referring to FIG. 2 and FIG. 6 , further, when the display device 30 is disposed at a distance from the touch screen 20 , a passivation layer 104 may be disposed on a surface of the shielding layer 25 of the touch screen 20 away from the substrate 22 , and the passivation layer 104 may be It is formed of a material such as tantalum nitride, cerium oxide, benzocyclobutene, a polyester film, or an acrylic resin. The passivation layer 104 is spaced apart from the front side of the display device 30 by a gap 106. Specifically, two support bodies 108 are disposed between the passivation layer 104 and the display device 30 described above. The passivation layer 104 is used as a dielectric layer that protects the display device 30 from damage due to excessive external forces.

When the display device 30 is integrated with the touch screen 20, the touch screen 20 and the display device 30 are in contact with each other. Immediately after the support 108 is removed, the passivation layer 104 is disposed on the front surface of the display device 30 without a gap.

In addition, the display device 100 further includes a touch screen controller 40, a display device controller 60, and a central processing unit 50. Among them, touch The screen controller 40, the central processing unit 50, and the display device controller 60 are connected to each other by a circuit, the touch screen controller 40 is connected to the electrode 28 of the touch screen 20, and the display device controller 60 is connected to the display device 30.

The principle of the touch screen 20 and the display device 100 in this embodiment is as follows: The touch screen 20 can be directly disposed on the display surface of the display device 30 when applied. The touch screen controller 40 positions the selection information input based on an icon or menu position touched by the touch object 70 such as a finger, and transmits the information to the central processing unit 50. The central processor 50 controls the display of the display device 30 through the display controller 60.

Specifically, a predetermined voltage is applied to the transparent conductive layer 24 when in use. A voltage is applied to the transparent conductive layer 24 through the electrode 28 to form an equipotential surface on the transparent conductive layer 24. The user visually confirms the display of the display device 30 disposed behind the touch screen 20, and when the user touches or approaches the protective layer 26 of the touch screen 20 by a touch object 70 such as a finger or a pen, the touch object 70 and the transparent conductive layer 24 are formed. A coupling capacitor. For high-frequency currents, the capacitor is a direct conductor that draws a portion of the current from the contact point for the finger. This current flows from the two electrodes connected to the touched carbon nanotube ribbon film structure of the touch screen 20, respectively, and the current flowing through the two electrodes is proportional to the distance of the finger from the two electrodes, and the touch screen controller 40 By accurately calculating the ratio of the two currents, the position of the touched point on the touched carbon nanotube film structure is obtained, and the position of each carbon nanotube film structure on the touch screen 20 is set. The data is combined to derive the touch location of the touch point on the touch screen 20. Thereafter, the touch screen controller 40 transmits the digitized touch location data to the central processor 50. Then, the central processing unit 50 accepts the above-mentioned number of touch positions According to and executed. Finally, the central processor 50 transmits the touch location data to the display controller 60 to display the touch information emitted by the contact 70 on the display device 30.

The display device 100 provided by the embodiment of the present technical solution has the following advantages: First, since the plurality of carbon nanotube film films in the transparent conductive layer are parallel and spaced apart, the transparent conductive layer has better mechanics. The performance, so that the transparent conductive layer has good mechanical strength and toughness, so the use of the above-mentioned carbon nanotube film structure as a transparent conductive layer can correspondingly improve the durability of the touch screen, thereby improving the use of the The durability of the display device of the touch screen; secondly, the plurality of carbon nanotube film films in the transparent conductive layer are parallel and spaced apart, so that the transparent conductive layer has a uniform resistance distribution and light transmittance, and Each of the electrodes is electrically connected to one end of at least one of the carbon nanotube strip film structures in the transparent conductive layer, so that the position of the touched point can be more accurately determined by detecting a change in current between the electrodes at the touch point, thereby It is advantageous to improve the resolution and accuracy of the touch screen and the display device using the touch screen.

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.

100‧‧‧ display device

104‧‧‧ Passivation layer

106‧‧‧ gap

108‧‧‧Support

20‧‧‧ touch screen

22‧‧‧ base

221‧‧‧ first surface

222‧‧‧ second surface

24‧‧‧Transparent conductive layer

240‧‧‧Non carbon tube long line

25‧‧‧Shield

26‧‧‧Protective layer

28‧‧‧Electrode

30‧‧‧Display equipment

40‧‧‧ touch screen controller

50‧‧‧ central processor

60‧‧‧Display device controller

70‧‧‧ touching objects

FIG. 1 is a schematic structural diagram of a touch screen according to an embodiment of the present technical solution.

Fig. 2 is a cross-sectional view taken along line II-II shown in Fig. 1.

FIG. 3 is a schematic structural diagram of a transparent conductive layer according to an embodiment of the present technical solution.

4 is a scanning electron micrograph of a carbon nanotube film of a transparent conductive layer according to an embodiment of the present technology.

FIG. 5 is a schematic structural diagram of a display device according to an embodiment of the present technical solution.

FIG. 6 is a schematic diagram of the working principle of the display device according to the embodiment of the present technical solution.

20‧‧‧ touch screen

22‧‧‧ base

221‧‧‧ first surface

222‧‧‧ second surface

24‧‧‧Transparent conductive layer

25‧‧‧Shield

26‧‧‧Protective layer

Claims (26)

A touch screen comprising: a substrate; a transparent conductive layer disposed on a surface of the substrate; and a plurality of electrodes respectively spaced apart and electrically connected to the transparent conductive layer, wherein the improvement is The transparent conductive layer further includes a carbon nanotube layer including a plurality of carbon nanotube film structures consisting of carbon nanotubes arranged in parallel and spaced apart, each of the nanometers Both ends of the carbon tube strip film structure are electrically connected to two opposite electrodes, respectively, and each of the electrodes is electrically connected to one end of at least one of the carbon nanotube strip film structures. The touch screen of claim 1, wherein the plurality of electrodes are disposed one-to-one correspondingly at both ends of the plurality of carbon nanotube film-like film structures. The touch screen of claim 1, wherein the carbon nanotube film structure is a layer of carbon nanotube film, and the carbon nanotube film comprises a plurality of aligned carbon nanotubes, and The plurality of carbon nanotubes are arranged along the length direction of the carbon nanotube film structure. The touch screen of claim 1, wherein the carbon nanotube film structure is an overlapping multi-layered carbon nanotube film, and each layer of carbon nanotube film comprises a plurality of aligned nanometers. Carbon tubes, and the carbon nanotubes in the adjacent two layers of carbon nanotube film are arranged in the same direction or in different directions. The touch screen of claim 3, wherein the carbon nanotube film further comprises a plurality of end-to-end carbon nanotube bundle segments, each of the carbon nanotube bundle segments having equal lengths and each The carbon nanotube bundle segment is composed of a plurality of mutually parallel carbon nanotube bundles, the plurality of carbon nanotube bundles Both ends of the segment are connected to each other by Van der Waals force. The touch screen of claim 5, wherein the adjacent carbon nanotube bundles are closely coupled by van der Waals force, and each nano carbon nanotube bundle comprises a plurality of nanometers of equal length and parallel arrangement. Carbon tube. The touch screen of claim 6, wherein the carbon nanotube comprises one or more of a single-walled carbon nanotube, a double-walled carbon nanotube, and a multi-walled carbon nanotube, the single The wall carbon nanotube has a diameter of 0.5 nm to 50 nm, the double-walled carbon nanotube has a diameter of 1.0 nm to 50 nm, and the multi-walled carbon nanotube has a diameter of 1.5 nm. 50 nm. The touch screen of claim 1, wherein the carbon nanotube film structure has a width of 1 mm to 10 cm. The touch screen of claim 1, wherein the carbon nanotube film structure has a thickness of 0.5 nm to 100 μm. The touch screen of claim 1, wherein the plurality of carbon nanotube film-like film structures have a separation distance of 5 nm to 1 mm. The touch screen of claim 1, wherein the plurality of electrodes are disposed at opposite ends of the transparent conductive layer at intervals. The touch screen of claim 11, wherein the plurality of electrodes are disposed on a surface of the transparent conductive layer away from the substrate by a conductive silver paste. The touch screen of claim 12, wherein the plurality of electrodes are metal plating or metal foil. The touch screen of claim 1, further comprising a protective layer disposed on a surface of the transparent conductive layer away from the substrate. The touch screen of claim 14, wherein the protective layer It is tantalum nitride, hafnium oxide, benzocyclobutene, polyester film or acrylic resin. The touch screen of claim 1, wherein the touch screen is a flat touch screen or a curved touch screen. The touch screen of claim 1, wherein the touch screen further comprises an optical compensation film disposed between the carbon nanotube film structures. The touch panel of claim 1, wherein the transparent conductive layer is formed by laying the carbon nanotube film structure. The touch panel of claim 1, wherein the transparent conductive layer is obtained by treating the carbon nanotube film structure adhered to the substrate with an organic solvent. The touch screen of claim 1, wherein the carbon nanotube film structure is one or more carbon nanotube films obtained by drawing from a carbon nanotube array. A display device comprising: a touch screen comprising a substrate; a transparent conductive layer disposed on a surface of the substrate; and a plurality of electrodes respectively spaced apart from the transparent conductive layer Electrically connecting; a display device disposed adjacent to and facing a surface of the touch screen substrate away from the transparent conductive layer; wherein the transparent conductive layer further comprises a carbon nanotube layer, the carbon nanotube layer comprising a plurality of carbon nanotube ribbon membrane structures consisting of carbon nanotubes arranged in parallel and spaced apart, wherein two ends of each of the carbon nanotube ribbon membrane structures are electrically connected to two opposite electrodes, respectively, and Each electrode is electrically coupled to one end of at least one carbon nanotube ribbon film structure. The display device of claim 21, wherein the display The device is one of a liquid crystal display, a field emission display, a plasma display, an electroluminescence display, a vacuum fluorescent display, and a cathode ray tube. The display device according to claim 21, wherein the display device is disposed or integrated with the touch screen. The display device of claim 21, wherein the display device further comprises a passivation layer disposed between the touch screen and the display device, disposed in contact with the touch screen, and disposed at a distance from the display device . The display device according to claim 24, wherein the passivation layer is tantalum nitride, hafnium oxide, benzocyclobutene, a polyester film or an acrylic resin. The display device of claim 25, wherein the display device further comprises a touch screen controller, a display device controller, and a central processing unit, wherein the touch screen controller, the central processing unit, and the display device control The three devices are connected to each other through a circuit, the touch screen controller is connected to the electrodes of the touch screen, and the display device controller is connected to the display device.