TWI399675B - Touch panel and display device using the same - Google Patents

Description

Touch screen and display device

The present invention relates to a touch screen and a display device, and more particularly to a touch screen using a carbon nanotube 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 in front of a display device such as a liquid crystal are gradually increasing. The user of such an electronic device operates by pressing the touch panel with a finger, a pen, or the like while visually checking the display content of the display device located on the back surface of the touch panel through the touch panel. Thereby, various functions of the electronic device can be operated.

According to the working principle of the touch screen and the transmission medium, the previous touch screens are divided into four types, namely resistive, capacitive, infrared and surface acoustic wave. Among them, resistive touch screens and capacitive touch screens are widely used (K. Noda, K. Tanimura, Electronics and Communications in Japan, Part 2, Vol. 84, No. 7, P40 (2001); Li Shuben, Wang Qingdi, Ji Jianhua, Optoelectronic Technology, Vol. 15, P62 (1995)).

The conventional resistive touch screen generally includes a first substrate, a first transparent conductive layer is formed on the first surface of the first substrate, and a second substrate is disposed on the second substrate. The second surface is formed with a second transparent conductive layer; the first transparent conductive layer is disposed opposite to the second transparent conductive layer; and a plurality of dot spacers (Dot Spacer), the plurality of dot spacers are disposed on the second Between a transparent conductive layer and a second transparent conductive layer. Wherein, the first transparent conductive layer and the second transparent conductive layer generally adopt an indium tin oxide (ITO) layer (hereinafter referred to as an ITO layer) having conductive properties. When the first substrate is pressed with a finger or a pen, the first substrate is twisted such that the first transparent conductive layer and the second transparent conductive layer at the pressing portion are in contact with each other. The voltage is sequentially applied to the first transparent conductive layer and the second transparent conductive layer by an external electronic circuit, and the electronic circuit can detect the pressed position. Further, the electronic circuit can initiate various functional switching of the electronic device based on the detected pressed position.

The capacitive touch screen of the prior art includes a glass substrate and a transparent conductive layer. In the capacitive touch panel, the transparent conductive layer is a transparent material such as indium tin oxide (ITO) or antimony tin oxide (ATO). 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 capacitance is a direct conductor, and the touch of a finger or the like touches a small current from the contact point. The touch screen controller calculates the position of the touch point by accurately calculating this current.

Therefore, improving the conductivity of the transparent conductive layer will help improve the accuracy and sensitivity of the touch screen.

In view of this, it is necessary to provide a high precision, high sensitivity and flexibility. A good touch screen, and a display device using the touch screen.

A touch screen includes: a first electrode plate, the first electrode plate includes a first substrate and a first transparent conductive layer, the first substrate has a first surface, and the first transparent conductive layer is disposed on the first a first surface of the substrate; and a second electrode plate spaced apart from the first electrode plate, the second electrode plate comprising a second substrate and a second transparent conductive layer, the second substrate having a a second surface, the second transparent conductive layer is disposed on the second surface of the second substrate, and the second transparent conductive layer is disposed opposite to the first transparent conductive layer; wherein the first transparent conductive layer and the first transparent conductive layer The at least one transparent conductive layer of the two transparent conductive layers comprises a carbon nanotube metal composite layer.

A touch screen comprising: a substrate; a transparent conductive layer disposed on a surface of the substrate; and at least two electrodes, the at least two electrodes being spaced apart and electrically connected to the transparent conductive layer; The transparent conductive layer comprises a carbon nanotube metal composite layer.

A touch screen includes: a first electrode plate, the first electrode plate includes a first substrate, a first transparent conductive layer and two first electrodes, the first substrate has a first surface, the first transparent conductive a layer is disposed on the first surface of the first substrate, the two first electrodes are respectively disposed on the surface of the first transparent conductive layer in a first direction, and are electrically connected to the first transparent conductive layer; and a second An electrode plate, the second electrode plate is spaced apart from the first electrode plate, the second electrode plate includes a second substrate, a second transparent conductive layer and two second electrodes, the second substrate has a second surface, The second transparent conductive layer is disposed on the second surface of the second substrate, the second transparent conductive layer and the first transparent layer The second conductive electrodes are oppositely disposed on the surface of the second transparent conductive layer and electrically connected to the second transparent conductive layer, and the first direction intersects with the second direction. Wherein the at least one transparent conductive layer of the first transparent conductive layer and the second transparent conductive layer comprises a carbon nanotube metal composite layer.

A touch screen includes: a first electrode plate, the first electrode plate includes a first substrate and a first transparent conductive layer, the first substrate has a first surface, and the first transparent conductive layer is disposed on the first a first surface of the substrate; and a second electrode plate spaced apart from the first electrode plate, the second electrode plate comprising a second substrate, a second transparent conductive layer, and two first electrodes Two second electrodes, the second substrate has a second surface, the second transparent conductive layer is disposed on the second surface of the second substrate, and the second transparent conductive layer is disposed opposite to the first transparent conductive layer The two first electrodes are respectively disposed on the surface of the second transparent conductive layer at intervals in the first direction, and the two second electrodes are respectively disposed on the surface of the second transparent conductive layer in the second direction, and the two The first electrode and the two second electrodes are electrically connected to the second transparent conductive layer, the first direction intersects the second direction; wherein at least one of the first transparent conductive layer and the second transparent conductive layer Transparent conductive layer includes Carbon nanotube metal composite layer.

A touch screen includes: a substrate; a transparent conductive layer disposed on a surface of the substrate; and four electrodes disposed on the transparent conductive layer or the surface of the substrate, and Electrically connecting to the transparent conductive layer; wherein the transparent conductive layer comprises a carbon nanotube metal composite layer .

A display device applying the above touch screen, wherein the display device further comprises a display device facing the touch screen and facing the touch screen.

Compared with the prior art, the touch screen provided by the present invention uses a carbon nanotube metal composite layer as a transparent conductive layer, and the display device using the touch screen has the following advantages: First, since the carbon nanotubes and the metal materials have better properties. The mechanical properties, the carbon nanotube metal composite layer composed of carbon nanotubes and metal materials has good toughness and mechanical strength, and is resistant to bending, so the durability of the touch screen can be improved accordingly, thereby improving the use of the touch screen. The durability of the display device; secondly, since the carbon nanotube metal composite layer includes a plurality of uniformly distributed carbon nanotubes, each of the carbon nanotubes is formed with a metal layer, a carbon nanotube and a metal material. It has good electrical conductivity. Therefore, the carbon nanotube metal composite layer has good electrical conductivity, low electrical resistivity and uniform resistance distribution. Therefore, the above-mentioned carbon nanotube metal composite layer is used for transparency. The conductive layer can correspondingly improve the sensitivity and accuracy of the touch screen, thereby improving the sensitivity and accuracy of the display device to which the touch screen is applied.

10;20‧‧‧ touch screen

100‧‧‧Nano carbon tube metal composite layer

111;211‧‧‧Nano carbon tube

112; 212‧‧‧ Wetting layer

114; 214‧‧‧ conductive layer

12‧‧‧First electrode plate

120‧‧‧First substrate

122‧‧‧First transparent conductive layer

124‧‧‧First electrode

126;26‧‧‧Transparent protective film

14‧‧‧Second electrode plate

140‧‧‧second substrate

142‧‧‧Second transparent conductive layer

144‧‧‧second electrode

146;25‧‧‧Shield

16‧‧‧ point spacers

18‧‧‧Insulation frame

213‧‧‧Transition layer

215‧‧‧Antioxidant layer

216‧‧‧ Strengthening layer

22‧‧‧ base

221‧‧‧ first surface

222‧‧‧ second surface

24‧‧‧Transparent conductive layer

28‧‧‧Electrode

400;500‧‧‧ display device

424; 524‧‧‧ passivation layer

426; 526 ‧ ‧ gap

430; 530‧‧‧ display equipment

440; 540‧‧‧ touch screen controller

450; 550‧‧‧ central processor

460;560‧‧‧Display device controller

470; 570‧‧‧ touch objects

480‧‧‧ Press

528‧‧‧Support

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

2 is a cross-sectional view of a first embodiment of a touch screen provided by the present invention.

3 is a transparent conductive layer in a first embodiment of the touch screen provided by the present invention Scanned electron micrographs.

Figure 4 is a schematic view showing the structure of a single carbon nanotube in Figure 3.

FIG. 5 is a schematic structural view of a single carbon nanotube in a transparent conductive layer in a second embodiment of the touch screen provided by the present invention.

6 is a top plan view of a third embodiment of a touch screen provided by the present invention.

Figure 7 is a cross-sectional view of the touch screen of Figure 6 taken along line VIII-VIII.

Fig. 8 is a view showing the operation state of the display device using the touch panel of the first embodiment.

Fig. 9 is a view showing the operation state of the display device using the touch panel of the third embodiment.

The touch screen provided by the present invention and the display device using the touch screen will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Referring to FIG. 1 and FIG. 2 , a first embodiment of the present invention provides a touch screen 10 . The touch screen 10 includes a first electrode plate 12 , a second electrode plate 14 , a plurality of transparent dot spacers 16 , and an insulating frame . 18 and a shielding layer 146. The first electrode plate 12 and the second electrode plate 14 are disposed at a relatively interval. The plurality of transparent dot spacers 16 and the insulating frame 18 are disposed between the first electrode plate 12 and the second electrode plate 14 , and the insulating frame 18 is disposed on the second electrode plate 14 Surroundings. The shielding layer 146 is disposed on a surface of the second electrode plate 14 away from the insulating frame 18.

The first electrode plate 12 includes a first substrate 120, a first transparent conductive layer 122 and two first electrodes 124. The first substrate 120 has a first surface, and the first transparent conductive layer 122 and the two first electrodes 124 are disposed on the first surface of the first substrate 120. The two first electrodes 124 are respectively disposed at two ends of the first transparent conductive layer 122 in the first direction, that is, the Y direction shown in FIG. 1 , and are electrically connected to the first transparent conductive layer 122 .

The second electrode plate 14 is spaced apart from the first electrode plate 12 by a distance of 2 to 10 microns. The second electrode plate 14 includes a second substrate 140, a second transparent conductive layer 142 and two second electrodes 144. The second substrate 140 is a planar structure having a second surface. The second transparent conductive layer 142 and the two second electrodes 144 are disposed on the second surface of the second substrate 140. The second direction, that is, the X direction shown in FIG. 1 is disposed at two ends of the second transparent conductive layer 142 and electrically connected to the second transparent conductive layer 142, and the second transparent conductive layer 142 and the two second electrodes 144 is disposed opposite to the first transparent conductive layer 122 and the two first electrodes 124.

Wherein, the first direction and the second direction are as long as they can intersect. In this embodiment, the first direction, that is, the Y direction is perpendicular to the second direction, that is, the X direction, that is, the two first electrodes 124 and the two second electrodes 144 are orthogonally disposed.

The first substrate 120 is a transparent film or sheet having a certain degree of softness, and the second substrate 140 is a transparent substrate. The material of the first substrate 120 is a flexible material such as plastic or resin. The material of the second substrate 140 may be selected from a hard material such as glass, quartz or diamond or a flexible material such as plastic or resin. Specifically, the flexible material comprises polycarbonate (PC), polymethyl methacrylate Polyester materials such as (PMMA), polyethylene terephthalate (PET), and polyether oxime (PES), cellulose ester, polyvinyl chloride (PVC), benzocyclobutene (BCB), and acrylic acid Materials such as resins. The first base body 120 and the second base body 140 have a thickness of 1 mm to 1 cm. In this embodiment, the first base body 120 and the second base body 140 are made of PET and have a thickness of 2 mm. It can be understood that the material forming the first substrate 120 is not limited to the materials listed above, as long as the first substrate 120 can serve as a support, and has certain flexibility and good transparency. The material forming the second substrate 140 is not limited to the materials listed above, as long as the second substrate 140 can function as a support and has a certain transparency.

The material of the first electrode 124 and the second electrode 144 is a metal, a carbon nanotube or other conductive material, as long as the first electrode 124 and the second electrode 144 are electrically conductive. In this embodiment, the material of the first electrode 124 and the second electrode 144 is silver. It can be understood that the above electrodes for the flexible touch screen should also have certain toughness and easy bending.

The first transparent conductive layer 122 and the second transparent conductive layer 142 have transparent conductive properties, and may be an ITO layer, an ATO layer, a carbon nanotube layer, a carbon nanotube metal composite layer or the like. The at least one transparent conductive layer of the first transparent conductive layer 122 and the second transparent conductive layer 142 is the carbon nanotube metal composite layer 100, and the carbon nanotube metal composite layer 100 comprises a carbon nanotube and a metal. Layers, and each surface of the carbon nanotubes is coated with a metal layer. Wherein each of the carbon nanotubes has a substantially equal length; the metal layer comprises at least one of a wetting layer, a conductive layer, and an oxidation resistant layer. The thickness of the metal layer is from 1 nm to 50 nm. Place The thickness of the carbon nanotube metal composite layer 100 is about 1.5 nm to 1 mm. The carbon nanotube metal composite layer 100 has a sheet resistance of 50 ohms to 2000 ohms and a visible light transmittance of 80% to 95%. The light transmittance refers to the transmittance of the carbon nanotube metal composite layer 100 to 550 nm light. The material of the metal layer comprises an alloy of copper, silver, gold, iron, cobalt, nickel, palladium, titanium, platinum or any combination thereof.

The carbon nanotube metal composite layer 100 includes a carbon nanotube layer and a metal layer coated on the surface of the carbon nanotube layer. Specifically, the carbon nanotube layer includes a plurality of carbon nanotubes to form a self-supporting structure by van der Waals interaction, the metal layer coating each nanocarbon in the carbon nanotube layer The surface of the tube. The carbon nanotube layer comprises a layer of carbon nanotube film or at least two layers of carbon nanotube film, and the at least two layers of carbon nanotube film are arranged side by side or stacked. The carbon nanotube film comprises a plurality of carbon nanotubes substantially parallel to each other and parallel to a surface of the carbon nanotube film, the plurality of carbon nanotubes being connected end to end by van der Waals force and preferably oriented in the same direction arrangement.

The so-called "self-supporting" means that the carbon nanotube film can maintain its own specific shape without being supported by a support. The self-supporting carbon nanotube film comprises a plurality of carbon nanotubes, and the plurality of carbon nanotubes are attracted to each other by Van der Waals forces and are connected end to end, so that the carbon nanotube film has a specific shape.

The carbon nanotube metal composite layer 100 comprises a plurality of carbon nanotube metal composite linear structures interconnected to form a network structure. The carbon nanotube metal composite wire structure comprises at least one nano carbon line and a metal layer coated on the surface of the at least one nano carbon line. When the carbon nanotube metal composite wire structure includes When there are two nano carbon pipelines, the at least two nanocarbon pipelines are arranged side by side or crosswise, and the surface of at least one of the nanocarbon pipelines is coated with a metal layer. The nanocarbon pipeline includes a plurality of carbon nanotubes, which are end-to-end connected by van der Waals force and arranged in a preferred orientation along the axial direction of the nanocarbon pipeline or spirally arranged. Wherein, the surface of each of the carbon nanotubes in the nanocarbon pipeline is coated with a metal layer. In addition, the carbon nanotube metal composite linear structure also includes at least one metal nanowire and a carbon nanotube composited inside the at least one metal nanowire. When the carbon nanotube metal composite linear structure comprises at least two metal nanowires, the at least two metal nanowires are arranged side by side or crosswise, and at least one of the metal nanowires is internally composited with nanocarbon tube.

In this embodiment, the carbon nanotube metal composite film comprises a layer of carbon nanotube film and a metal layer coated on the surface of the carbon nanotube film. Specifically, referring to FIG. 3 and FIG. 4, the carbon nanotube metal composite layer 100 includes a plurality of uniformly distributed carbon nanotubes 111, and the plurality of carbon nanotubes 111 form a self-supporting carbon nanotube. membrane. Moreover, each of the carbon nanotubes 111 is coated with a metal layer on its surface. In the carbon nanotube metal composite layer 100, the carbon nanotubes 111 are arranged in a preferred orientation in the same direction. Each of the carbon nanotubes 111 in the carbon nanotube metal composite layer 100 has substantially equal lengths and is connected end to end by Van der Waals force.

The surface of each of the carbon nanotubes 111 in the carbon nanotube metal composite layer 100 is coated with a wetting layer 112 directly bonded to the surface of the carbon nanotube 111, and is disposed outside the wetting layer 112. Conductive layer 114.

Since the wettability between the carbon nanotubes 111 and most of the metals is not good, the wetting layer 112 functions to make the conductive layer 114 and the carbon nanotubes 111 better. Combine. The material forming the wetting layer 112 may be a metal such as iron, cobalt, nickel, palladium or titanium which has good wettability with the carbon nanotube 111 or an alloy thereof. The thickness of the wetting layer 112 is 1 nm to 10 Nano. In this embodiment, the wetting layer 112 is made of nickel and has a thickness of about 2 nm. It will be appreciated that the wetting layer is an optional structure.

The conductive layer 114 functions to make the carbon nanotube metal composite layer 100 have better electrical conductivity. The material forming the conductive layer 114 may be a conductive metal such as copper, silver or gold or an alloy thereof, and the conductive layer 114 has a thickness of 1 nm to 20 nm. In this embodiment, the conductive layer 114 is made of gold and has a thickness of about 10 nm.

In this embodiment, the carbon nanotube metal composite layer 100 includes a plurality of carbon nanotubes 111, and the surface of each of the carbon nanotubes 111 includes a nickel wetting layer 112 having a thickness of 2 nm and a thickness of 10 nm. The gold conductive layer 114. The square carbon nanotube metal composite layer 100 has a sheet resistance of 1173 ohms and a light transmittance of 92.7% with a wavelength of 550 nm.

It can be understood that the sheet resistance and light transmittance of the carbon nanotube metal composite layer 100 are related to the structure and thickness of the carbon nanotube metal composite layer 100. For example, when the surface of each of the carbon nanotubes 111 in the carbon nanotube metal composite layer 100 includes a nickel wetting layer having a thickness of 2 nm and a gold conductive layer having a thickness of 15 nm, the nanocarbon The tube metal composite layer 100 has a sheet resistance of 495 ohms and a light transmittance of 90 nm at a wavelength of 550 nm. When the surface of each of the carbon nanotubes 111 in the carbon nanotube metal composite layer 100 comprises a nickel wetting layer having a thickness of 2 nm and a gold conductive layer having a thickness of 20 nm; the carbon nanotube metal composite Layer 100 The light resistance was 208 ohms, and the light transmittance of light having a wavelength of 550 nm was 89.7%.

In the first embodiment, the first transparent conductive layer 122 and the second transparent conductive layer 142 are both the carbon nanotube metal composite layer 100. Since the specific surface area of the carbon nanotube itself is very large, the carbon nanotube metal composite layer 100 itself has a strong viscosity. Therefore, in the embodiment, the carbon nanotube metal composite layer 100 can directly adhere to the first substrate 120 and the second substrate 140 as the first transparent conductive layer 122 and the second transparent conductive layer 142.

In addition, the above-described carbon nanotube metal composite layer 100 adhered to the first substrate 120 and the second substrate 140 may be treated with an organic solvent. Specifically, the entire carbon nanotube metal composite layer 100 may be infiltrated by dropping an organic solvent on the surface of the carbon nanotube metal composite layer 100 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 metal composite layer 100 is subjected to an organic solvent infiltration treatment, the carbon nanotube metal composite layer 100 can be firmly attached to the first substrate 120 and the second under the action of the surface tension of the volatile organic solvent. The surface of the substrate 140, and the specific surface area of the carbon nanotube metal composite layer 100 is reduced, the viscosity is lowered, and the mechanical strength and toughness are good.

It can be understood that the carbon nanotube metal composite layer 100 can also be adhered to the first substrate 120 and the second substrate 140 by adhesive.

The plurality of dot spacers 16 are disposed on the second transparent conductive layer 142 of the second electrode plate 14, and the plurality of dot spacers 16 are spaced apart from each other. The insulating frame 18 is disposed on the first surface and the second electrode of the first electrode plate 12 Between the second surfaces of the plates 18. The plurality of dot spacers 16 and the insulating frame 18 may be made of an insulating resin or other insulating material, and the dot spacers 16 should be made of a transparent material. The plurality of dot spacers 16 and the insulating frame 18 may electrically insulate the first electrode plate 14 from the second electrode plate 12. It can be understood that when the size of the touch screen 10 is small, the plurality of dot spacers 16 are optional structures as long as the insulating frame 18 can ensure that the first electrode plate 14 is electrically insulated from the second electrode plate 12.

The shielding layer 146 is disposed on a surface of the second substrate 140 away from the insulating frame 18. The shield layer 146 is designed to reduce electromagnetic interference generated by the display device and to avoid errors in signals emitted from the touch screen 10. The shielding layer 146 may be formed of a conductive material such as a carbon nanotube film, a carbon nanotube metal composite layer, or a conductive polymer film. In this embodiment, the shielding layer 146 comprises a carbon nanotube film, and the arrangement of the carbon nanotubes in the carbon nanotube film is not limited, and may be oriented or arranged. In this embodiment, the carbon nanotubes in the shielding layer 146 are aligned, and the shielding layer 146 acts as a grounding point to function as a shield, so that the touch screen 10 can work in an interference-free environment. It will be appreciated that the shield layer 146 is an optional structure.

In addition, the touch screen 10 further includes a transparent protective film 126 disposed on a surface of the first electrode plate 12 away from the first transparent conductive layer 122. The transparent protective film 126 may be directly bonded to the first electrode plate 12 by an adhesive, or may be press-fitted with the first electrode plate 12 by a hot pressing method. The transparent protective film 126 may be a surface-hardened smooth scratch-resistant plastic layer or resin layer, which may be made of phenylcyclobutene (BCB). , polyester and acrylic resin and other materials. In this embodiment, the material for forming the transparent protective film 126 is polyethylene terephthalate (PET) for protecting the first electrode plate 12 to improve durability. The transparent protective film 126 can be used in a special process to provide additional functions such as reducing glare or reducing reflection.

It can be understood that the two first electrodes 124 may not be disposed on the first electrode plate 12, but are disposed on the second electrode plate 14 together with the two second electrodes 144. Specifically, the two first electrodes 124 are disposed on the surface of the second transparent conductive layer 142 at intervals in the first direction, and the two second electrodes 144 are spaced apart from the second transparent conductive layer 142 in the second direction. a surface, and the two first electrodes 124 and the two second electrodes 144 are electrically connected to the second transparent conductive layer 142, and the first direction intersects the second direction.

The second embodiment of the present invention provides a touch screen, which is basically the same as the touch screen 100 of the first embodiment. The difference is that the first transparent conductive layer and the second transparent conductive layer are in the first embodiment. The structures of the first transparent conductive layer 122 and the second transparent conductive layer 142 in the embodiment are different.

In the second embodiment, the first transparent conductive layer and the second transparent conductive layer are a carbon nanotube metal composite layer, and the carbon nanotube metal composite film comprises a carbon nanotube film and a metal layer. The carbon nanotube metal composite layer comprises a plurality of carbon nanotubes. Specifically, referring to FIG. 5, each of the carbon nanotubes 211 in the carbon nanotube metal composite layer is coated with a surface. a wetting layer 212 directly bonded to the surface of the carbon nanotube 211, a transition layer 213 disposed outside the wetting layer, a conductive layer 214 disposed outside the transition layer 213, an oxidation resistant layer 215 disposed outside the conductive layer 214, and The reinforcing layer 216 outside the oxidation resistant layer 215.

Since the wettability between the carbon nanotubes 211 and most of the metals is not good, the wetting layer 212 functions to better bond the conductive layer 214 to the carbon nanotubes 211. The material forming the wetting layer 212 may be a metal such as iron, cobalt, nickel, palladium or titanium which has good wettability with the carbon nanotube 211 or an alloy thereof. The thickness of the wetting layer 212 is 1 nm to 10 Nano. In this embodiment, the material of the wetting layer 212 is titanium and has a thickness of about 2 nm. It will be appreciated that the wetting layer is an optional structure.

The transition layer 213 functions to better bond the wetting layer 212 to the conductive layer 214. The material forming the transition layer 213 is a material which can be well combined with the material of the wetting layer 212 and the material of the conductive layer 214. The thickness of the transition layer 213 is from 1 nm to 10 nm. In this embodiment, the material of the transition layer 213 is copper and has a thickness of 2 nm. It will be appreciated that the transition layer 213 is an optional structure.

The conductive layer 214 functions to make the carbon nanotube metal composite layer have better electrical conductivity. The material forming the conductive layer 214 may be a conductive metal such as copper, silver or gold or an alloy thereof, and the conductive layer 214 has a thickness of 1 nm to 20 nm. In this embodiment, the conductive layer 214 is made of silver and has a thickness of about 10 nm.

The anti-oxidation layer 215 functions to prevent the conductive layer 214 from being oxidized in the air during the manufacture of the carbon nanotube metal composite layer, thereby reducing the conductivity of the carbon nanotube metal composite layer. The material forming the oxidation resistant layer 215 may be gold or platinum equal to a stable metal which is not easily oxidized in the air or an alloy thereof, and the anti-oxidation The thickness of the layer 215 is from 1 nm to 10 nm. In this embodiment, the material of the oxidation resistant layer 115 is platinum and has a thickness of 2 nm. It will be appreciated that the oxidation resistant layer 215 is an optional structure.

The strengthening layer 216 is used to increase the strength of the carbon nanotube metal composite layer. The material forming the strengthening layer 216 may be a polymer having higher strength such as polyvinyl alcohol (PVA), polyphenylene benzobisoxazole (PBO), polyethylene (PE) or polyvinyl chloride (PVC). Layer 216 has a thickness of from 0.1 micron to 1 micron. In this embodiment, the reinforcing layer 216 is made of polyvinyl alcohol (PVA) and has a thickness of 0.2 μm. It will be appreciated that the reinforcement layer 216 is an optional structure.

Referring to FIG. 6 and FIG. 7 , a third embodiment of the present invention provides a touch screen 20 . The touch screen 20 includes a substrate 22 , a transparent conductive layer 24 , at least four electrodes 28 , a shielding layer 25 , and a transparent protective film 26 . 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 at least four electrodes 28 are respectively disposed at four corners or edges of the transparent conductive layer 24, and are electrically connected to the transparent conductive layer 24, The transparent conductive layer 24 forms an equipotential surface. The shielding layer 25 is disposed on the second surface 222 of the substrate 22 . The transparent protective film 26 can be directly disposed on the transparent conductive layer 24 and the electrode 28.

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 range of the flexible material is the same as the range of the flexible material of the first substrate 120 in the first embodiment. The base 22 functions primarily as a support. In this embodiment, the base 22 is a flat type structure, and the base 22 is a flexible material polycarbonate (PC). .

The transparent conductive layer 24 comprises a carbon nanotube metal composite layer, and the material of the carbon nanotube metal composite layer comprises a carbon nanotube and a metal conductive material. Specifically, the structure of the carbon nanotube metal composite layer may be the same as the structure of the carbon nanotube metal composite layer in the first transparent conductive layer 122 and the second transparent conductive layer 142 in the first embodiment; The first transparent conductive layer in the second embodiment has the same structure as the carbon nanotube composite layer in the second transparent conductive layer. The structure of the carbon nanotube metal composite layer described in this embodiment is the same as the structure of the carbon nanotube metal composite layer in the first transparent conductive layer 122 and the second transparent conductive layer 142 in the first embodiment.

Specifically, four electrodes 28 may be respectively disposed on the four corners or four sides of the transparent conductive layer 24 to form a uniform resistance network on the transparent conductive layer 24 described above. In this embodiment, four strip electrodes 28 are spaced apart from each other on four 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 the transparent conductive layer 24 forms an equipotential surface. In this embodiment, the electrode 28 is disposed on a surface of the transparent conductive layer 24 away from the substrate 22.

It can be understood that the four electrodes 28 can also be disposed between the transparent conductive layer 24 and the substrate 22 and electrically connected to the transparent conductive layer 24.

The materials of the four electrodes 28 are metal, carbon nanotubes, carbon nanotube metal composite materials or other conductive materials, as long as the four electrodes 28 can be electrically conductive. . In this embodiment, the four electrodes 28 are strip electrodes 28 composed of a low-resistance conductive metal plating such as silver or copper or a metal foil.

The shielding layer 25 has the same material and function as the shielding layer 146 in the first embodiment.

The transparent protective film 26 may be formed of tantalum nitride, hafnium oxide, styrene bromide (BCB), a polyester film, an acrylic resin, or the like. The transparent protective film 26 has a certain hardness and protects the transparent conductive layer 24. It can be understood that the transparent protective film 26 can also be processed by a special process such as reducing glare, reducing reflection, and the like. In this embodiment, a ruthenium dioxide layer is disposed on the surface of the transparent conductive layer 24 on which the electrode 28 is formed as a transparent protective film 26, and the hardness of the transparent protective film 26 can reach 7H (H is in the Rockwell hardness test, unloading The depth of the indentation remaining under the initial test force, except for the main test force). It can be understood that the hardness and thickness of the transparent protective film 26 can be selected as needed. The transparent protective film 26 can be directly bonded to the surface of the transparent conductive layer 24 and the electrode 28 away from the substrate 22 by an adhesive. It will be appreciated that the transparent protective film 26 is an optional structure.

Please refer to FIG. 8. FIG. 8 is a display device 400 of the touch screen 10 of the first embodiment, which includes a touch screen 10, a display device 430, a touch screen controller 440, a central processing unit 450, and a display device controller 460. . The touch screen controller 440, the central processing unit 450, and the display device controller 460 are connected to each other through a circuit. The touch screen controller 440 is electrically connected to the touch screen 10. The display device controller 460 and the display device 430 are connected to the display device 430. Electrical connection. The touch screen controller 440 touches a graphic or a function table by a touch object 470 such as a pen To select the information input and pass the information to the central processing unit 450. The central processing unit 450 controls the display device 430 to display through the display device controller 460. The display device 430 is disposed adjacent to and adjacent to the second electrode plate 14 of the touch screen 10.

The touch screen 10 can be spaced apart from the display device 430 or integrated into the display device 430. When the touch screen 10 is integrated with the display device 430, the touch screen 10 can be attached to the display device 430 by an adhesive. When the display device 430 is spaced apart from the touch screen 10, a passivation layer 424 may be disposed on the surface of the shielding layer 146 of the touch screen 10 away from the second substrate 140. The passivation layer 424 may be composed of benzocyclobutene (BCB). A flexible material such as an ester or an acrylic resin is formed. The passivation layer 424 is spaced apart from the front side of the display device 430 by a gap 426. The passivation layer 424 is used as a dielectric layer, and the display device 430 can be protected from damage due to excessive external force.

The display device 430 may be one of a conventional display device 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. In addition, the display device 430 can also be one of flexible displays such as a flexible liquid crystal display, a flexible electrophoretic display, and a flexible organic electroluminescent display. In this embodiment, the display device 430 is a liquid crystal display.

In use, a voltage is applied to the second electrode plate 14 of the first electrode plate 12, respectively. The user visually confirms the display of the display device 430 disposed under the touch screen 10, and presses the first electrode plate 12 of the touch panel 10 by a touch object 470 such as a pen to operate. The first base body 120 of the first electrode plate 12 is bent by force The first transparent conductive layer 122 of the first electrode plate 12 of the pressing portion 480 is in contact with the second transparent conductive layer 142 of the second electrode plate 14 . The touch screen controller 440 converts the voltage change of the first transparent conductive layer 122 in the X direction and the voltage change of the second transparent conductive layer 142 in the Y direction, respectively, and performs accurate calculation to convert it into contact coordinates. Touch screen controller 440 communicates the digitized contact coordinates to central processor 450. The central processing unit 450 issues corresponding commands according to the contact coordinates, initiates various function switching of the electronic device, and controls the display device 430 to display through the display device controller 460.

Please refer to FIG. 9. FIG. 9 is a display device 500 using the touch screen 20 of the third embodiment. The display device 500 includes a touch screen 20, a display device 530, a touch screen controller 540, a central processing unit 550, and a display device controller 560. The touch screen controller 540, the central processing unit 550, and the display device controller 560 are connected to each other through a circuit. The touch screen controller 540 is connected to the electrode 28 of the touch screen 20, and the display device controller 560 is connected to the display device 530. The display device 530 is positioned directly adjacent to the touch screen 20.

The display device 530 is disposed adjacent to and close to the shielding layer 25 of the touch screen 20. The display device 530 and the touch screen 20 can be spaced apart or integrated. When the display device 530 is spaced apart from the touch screen 20, a passivation layer 524 may be disposed on a surface of the shield layer 25 of the touch screen 20 away from the substrate 22. The passivation layer 524 may be benzocyclobutene (BCB), polyester or acrylic. A flexible material such as a resin is formed. A gap 526 is disposed between the passivation layer 524 and the display surface of the display device 530. Specifically, a support body 528 is disposed between the passivation layer 524 and the display device 530 described above. The passivation layer 524 is used as a dielectric layer, the passivation layer 524 and the gap 526 can protect display device 530 from damage due to excessive external forces. When the display device 530 is integrated with the touch screen 20, the touch screen 20 is in contact with the display device 530. Immediately after the support 528 is removed, the passivation layer 524 is disposed on the display surface of the display device 530 without a gap.

The type of the display device 530 is the same as the type of the display device 430 in the display device 400 provided by the first embodiment of the display device provided by the present invention.

The principle of the touch screen 20 and the display device 500 in this embodiment is as follows: The touch screen 20 can be directly disposed on the display surface of the display device 530 when applied. The touch screen controller 540 selects an information input according to a graphic or a function table touched by a touch object 570 such as a finger, and transmits the information to the central processing unit 550. The central processing unit 550 controls the display device 530 display through the display controller 560.

Specifically, in use, a predetermined voltage is applied to the electrode 28 to the transparent conductive layer 24, thereby forming an equipotential surface on the transparent conductive layer 24. The user visually confirms the display of the display device 530 disposed behind the touch screen 20, and when the user touches or approaches the transparent protective layer 26 of the touch screen 20 by a touch object 570 such as a finger, the touch object 570 and the transparent conductive layer 24 form a Coupling capacitor. For high frequency currents, the capacitor is a direct conductor, so the finger draws a portion of the current from the point of contact. This current flows out of the electrode 28 of the touch screen 20, respectively, and the current flowing through the four electrodes 28 is proportional to the distance from the finger to the four corners, and the touch screen controller 540 obtains the touch point by accurately calculating the ratio of the four currents. The location. Thereafter, the touch screen controller 540 transmits the digitized touch location data to the central processor 550. The central processor 550 then receives the touch location data described above and executes it. Finally, the central processing unit 550 The touch location data is transmitted to display controller 560 to display touch information from contact 570 on display device 530.

It can be understood that the second embodiment of the touch screen provided by the present invention can also be used in the above display device.

The touch screen using the carbon nanotube metal composite layer as the transparent conductive layer and the display device using the touch screen provided by the embodiment of the invention have the following advantages: First, since the carbon nanotubes and the metal have better mechanical properties, The carbon nanotube and the metal carbon nanotube metal composite layer have good toughness and mechanical strength, and are resistant to bending, so that the durability of the touch screen can be improved accordingly, thereby improving the durability of the display device using the touch screen. Secondly, since the carbon nanotube metal composite layer has high light transmittance, the transparency of the touch screen can be improved, thereby improving the transparency of the display device using the touch screen; and third, since the carbon nanotube metal composite layer includes a plurality of uniformly distributed carbon nanotubes, and the carbon nanotubes have excellent electrical conductivity. In addition, each of the carbon nanotubes in the carbon nanotube metal composite layer is formed with a metal conductive material, and the metal is electrically conductive. The material has good electrical conductivity, therefore, the carbon nanotube metal composite layer has good electrical conductivity, low resistivity, uniform resistance Distribution, therefore, the use of the above-mentioned carbon nanotube metal composite layer as a transparent conductive layer, can correspondingly improve the sensitivity and accuracy of the touch screen, thereby improving the sensitivity and accuracy of the display device using the touch screen; Fourth, in the practice of the present invention When the material of the substrate is a flexible material, a flexible touch screen can be prepared, which is suitable for use in a flexible display device.

In summary, the present invention has indeed met the requirements of the invention patent, and Application for interest. 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‧‧‧First electrode plate

120‧‧‧First substrate

122‧‧‧First transparent conductive layer

124‧‧‧First electrode

14‧‧‧Second electrode plate

140‧‧‧second substrate

142‧‧‧Second transparent conductive layer

144‧‧‧second electrode

146‧‧‧Shield

16‧‧‧ point spacers

18‧‧‧Insulation frame

Claims (14)

A touch screen includes: a first electrode plate, the first electrode plate includes a first substrate and a first transparent conductive layer, the first substrate has a first surface, and the first transparent conductive layer is disposed on the first a first surface of the substrate; and a second electrode plate spaced apart from the first electrode plate, the second electrode plate comprising a second substrate and a second transparent conductive layer, the second substrate having a a second surface, the second transparent conductive layer is disposed on the second surface of the second substrate, the second transparent conductive layer is disposed opposite to the first transparent conductive layer; and the improvement is that the first transparent conductive layer And at least one transparent conductive layer in the second transparent conductive layer comprises a carbon nanotube metal composite layer, the carbon nanotube metal composite layer comprising a carbon nanotube layer and a metal coated on the surface of the carbon nanotube layer Floor. A touch screen comprising: a substrate; a transparent conductive layer disposed on a surface of the substrate; and at least two electrodes spaced apart and electrically connected to the transparent conductive layer; The improvement is that the transparent conductive layer comprises a carbon nanotube metal composite layer, the carbon nanotube metal composite layer comprises a carbon nanotube layer and is coated on the nano carbon The metal layer on the surface of the tube layer. The touch screen of claim 1 or 2, wherein the carbon nanotube layer comprises a plurality of carbon nanotubes, and the plurality of carbon nanotubes are connected to each other to form a self-supporting structure by van der Waals force The metal layer is coated on the surface of each of the carbon nanotubes in the carbon nanotube layer. The touch screen of claim 3, wherein the carbon nanotube layer comprises at least one layer of carbon nanotube film. The touch screen of claim 4, wherein the carbon nanotube layer comprises at least two layers of carbon nanotube film arranged side by side or stacked. The touch screen of claim 4, wherein the carbon nanotube film comprises a plurality of carbon nanotubes substantially parallel to each other and parallel to a surface of the carbon nanotube film. The touch screen of claim 6, wherein the carbon nanotube film comprises a plurality of carbon nanotubes connected end to end by van der Waals force and arranged in a preferred orientation along substantially the same direction. The touch screen of claim 1 or 2, wherein the metal layer material is an alloy of copper, silver, gold, iron, cobalt, nickel, palladium, titanium, platinum or any combination thereof. The touch screen of claim 1 or 2, wherein the metal layer has a thickness of from 1 nm to 50 nm. A touch screen includes: a first electrode plate, the first electrode plate includes a first substrate, a first transparent conductive layer and two first electrodes, the first substrate has a first surface, the first transparent conductive The layer is disposed on the first surface of the first substrate, and the two first electrodes are respectively disposed on the surface of the first transparent conductive layer in the first direction And electrically connected to the first transparent conductive layer; and a second electrode plate spaced apart from the first electrode plate, the second electrode plate includes a second substrate, a second transparent conductive layer, and Two second electrodes, the second substrate has a second surface, the second transparent conductive layer is disposed on the second surface of the second substrate, and the second transparent conductive layer is disposed opposite to the first transparent conductive layer The two second electrodes are respectively disposed on the surface of the second transparent conductive layer in the second direction, and are electrically connected to the second transparent conductive layer, wherein the first direction intersects the second direction; The at least one transparent conductive layer of the first transparent conductive layer and the second transparent conductive layer comprises a carbon nanotube metal composite layer. A touch screen includes: a first electrode plate, the first electrode plate includes a first substrate and a first transparent conductive layer, the first substrate has a first surface, and the first transparent conductive layer is disposed on the first a first surface of the substrate; and a second electrode plate spaced apart from the first electrode plate, the second electrode plate comprising a second substrate, a second transparent conductive layer, and two first electrodes Two second electrodes, the second substrate has a second surface, the second transparent conductive layer is disposed on the second surface of the second substrate, and the second transparent conductive layer is disposed opposite to the first transparent conductive layer The two first electrodes are respectively disposed on the surface of the second transparent conductive layer at intervals in the first direction, and the two second electrodes are respectively disposed on the surface of the second transparent conductive layer in the second direction, and the two The first electrode and the two second electrodes are electrically connected to the second transparent conductive layer, the first direction intersects the second direction; and the improvement is that the first transparent conductive layer and the second transparent conductive layer at least A transparent conductive layer comprises a carbon nanotube metal composite layer, the carbon nanotube metal composite layer comprises a plurality of carbon nanotubes and a metal layer covering the surface of each of the carbon nanotubes, the plurality of nanocarbons The pipe is connected end to end by Van der Valli. A touch screen includes: a substrate; a transparent conductive layer disposed on a surface of the substrate; and four electrodes disposed on the transparent conductive layer or the surface of the substrate, and Electrically connecting with the transparent conductive layer; the improvement is that the transparent conductive layer comprises a carbon nanotube metal composite layer, the carbon nanotube metal composite layer comprises a plurality of carbon nanotubes and is coated on each nanometer The metal layer on the surface of the carbon tube, the plurality of carbon nanotubes are connected end to end by Van der Waals force. A display device for a touch screen as described in claim 1, 2, 10, 11 or 12, wherein the display device further comprises a display device facing the touch screen and facing the touch screen. The display device of claim 13, wherein the display device is integrated with the touch screen.