TWI517018B - Display device - Google Patents

Description

Display device

The present invention relates to a display device, and more particularly to a display device having a touch screen.

In recent years, with the development of high performance and diversification of various electronic devices such as mobile phones and touch navigation systems, display devices in which a translucent touch panel is mounted on the front surface of a display element such as a liquid crystal are gradually increasing. The user of the display device operates the touch panel by pressing the touch panel with a finger or a pen while visually checking the display content of the display element located on the back surface of the touch panel through the touch panel. Thereby, various functions of the display device can be operated.

According to the working principle of the touch screen and the transmission medium, the previous touch screens are generally divided into four types, namely, resistive, capacitive inductive, infrared, and surface acoustic wave. Resistive touch screens and capacitive touch screens are widely used in display devices due to their high resolution, high sensitivity and durability.

Capacitive and resistive touch screens of the prior art typically include an indium tin oxide layer (ITO layer) as a transparent conductive layer, which is prepared by ion beam sputtering or sputtering, Kazuhiro Noda et al. in the Production of Transparent Conductive A touch screen using an ITO/SiO ₂ /PET layer is described in Films with Inserted SiO2 Anchor Layer, and Application to a Resistive Touch Panel (Electronics and Communications in Japan, Part 2, Vol. 84, P39-45 (2001)). However, in the preparation process, the ITO layer requires a high vacuum environment and needs to be heated to 200 to 300 ° C. Therefore, the preparation cost of the ITO layer is high. In addition, after the ITO layer is continuously bent, the resistance at the bend is increased, which has the disadvantage that the transparent conductive layer has insufficient mechanical and chemical durability.

In view of this, it is indeed necessary to provide a display device with good durability.

A display device includes: a touch screen, the touch screen includes a first electrode plate and a second electrode plate, the first electrode plate includes a first substrate, a first conductive layer and two first electrodes, The first conductive layer is disposed on a surface of the first substrate, the two first electrodes are electrically connected to the first conductive layer; the second electrode plate is spaced apart from the first electrode plate, and the second electrode plate includes a first electrode plate a second substrate, a second conductive layer and two second electrodes, the second conductive layer is disposed on a surface of the second substrate and opposite to the first conductive layer, the two second electrodes and the first a second conductive layer electrically connected; and a display disposed adjacent to the second electrode plate of the touch screen, the display includes a plurality of pixel points, the plurality of pixel points being arranged in a plurality of rows along a first direction and Arranging a plurality of columns along a second direction; wherein at least one of the second conductive layer and the first conductive layer comprises a carbon nanotube structure, the carbon nanotube structure comprising a plurality of carbon nanotubes Basic orientation in the same direction Column, and the plurality of the second axial direction of a carbon nanotube angle, the angle is an angle greater than 0 degrees and less than or equal to 90 degrees.

A display device comprising: a touch screen, the touch screen comprising a substrate, a transparent conductive layer and at least two electrodes, the substrate having a first surface, the transparent conductive layer being disposed on the first surface of the substrate Between the at least two electrodes And being electrically connected to the transparent conductive layer; and a display disposed adjacent to the substrate of the touch screen, the display comprising a plurality of pixel points, the plurality of pixel points being arranged in a first direction And arranged in a second direction in a plurality of columns; wherein the transparent conductive layer comprises a carbon nanotube structure, the carbon nanotube structure comprises a plurality of carbon nanotubes, and the axes of the plurality of carbon nanotubes Forming an angle with the second direction, the angle of the angle being greater than 0 degrees and less than 90 degrees.

Compared with the prior art, since the transparent conductive layer using the carbon nanotube structure has uniform resistance distribution and light transmittance and excellent mechanical properties, the resolution and accuracy of the touch panel and the display device using the above transparent conductive layer are compared. Higher and more durable.

10,210‧‧‧ touch screen

100,200‧‧‧ display device

12‧‧‧First electrode plate

120‧‧‧First substrate

122‧‧‧First conductive layer

124‧‧‧First electrode

126,226‧‧‧Transparent protective film

14‧‧‧Second electrode plate

140‧‧‧Second substrate

142‧‧‧Second conductive layer

144‧‧‧second electrode

16‧‧‧ point spacers

18‧‧‧Insulation

20,220‧‧‧ display

202‧‧‧ pixels

22,230‧‧‧Shield

221‧‧‧ first surface

222‧‧‧ base

223‧‧‧ second surface

224‧‧‧Transparent conductive layer

228‧‧‧electrode

24,232‧‧‧passivation layer

26‧‧‧ gap

30,250‧‧‧ touch screen controller

40,260‧‧‧ central processor

50,270‧‧‧ display controller

60‧‧‧ touching objects

70‧‧‧ Press

1 is a perspective exploded view of a display device according to a first embodiment of the present invention.

Fig. 2 is a side elevational view showing the display device of the first embodiment of the present invention.

Fig. 3 is a scanning electron micrograph of a carbon nanotube film used as a conductive layer in a touch panel in the display device of the first embodiment of the present invention.

4 is a side view showing the structure of the display device in the first embodiment of the present invention.

Figure 5 is a side elevational view showing the display device of the second embodiment of the present invention.

Fig. 6 is a side view showing the structure of the display device in the second embodiment of the present invention.

The display device provided by the embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

Referring to FIG. 1 and FIG. 2 , a first embodiment of the present invention provides a display device 100 . The display device 100 includes a touch screen 10 and a display 20 . The touch screen 10 is a resistive touch screen. The display 20 is disposed directly adjacent to the touch screen 10. specifically The touch screen 10 can be disposed at a predetermined distance from the display 20 or can be integrated on the display 20. When the touch screen 10 is integrated with the display 20, the touch screen 10 can be attached to the display 20 by an adhesive.

The display 20 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 display. In this embodiment, the display 20 is a liquid crystal display. The screen displayable by the display 20 is composed of a plurality of pixel points 202 arranged in a plurality of rows along a first direction and arranged in a plurality of columns along a second direction. The first direction is the D1 direction, the second direction is the D2 direction, and the D1 direction is perpendicular to the D2 direction. Each pixel point 202 can include a red display unit (R), a green display unit (G), and a blue display unit (B). The R, G, and B may be sequentially arranged cyclically along the D1 direction. Referring to FIG. 1, the R, G, and B are cyclically arranged in the D1 direction in a manner of RGBRGBRGBRGB. The color of the pixel point 202 is prepared by red color displayed by the red display unit, green displayed by the green display unit, and blue displayed by the blue display unit. It can be understood that the plurality of pixel points 202 can form an array of pixel points (not labeled). The plurality of pixel points 202 in the pixel array are arranged in a plurality of rows and columns, and the number of rows and the number of columns may be determined according to specific needs.

The touch screen 10 includes a first electrode plate 12, a second electrode plate 14, and a plurality of transparent dot spacers 16 disposed between the first electrode plate 12 and the second electrode plate 14. The first electrode plate 12 includes a first substrate 120, a first conductive layer 122 and two first electrodes 124. The first substrate 120 is a planar structure, and the first conductive layer 122 and the two first electrodes 124 are disposed on the surface of the first substrate 120. The two first electrodes 124 are respectively disposed at both ends of the first conductive layer 122 in the D1 direction and are electrically connected to the first conductive layer 122. The second electrode plate 14 includes a second base 140 and a second conductive Layer 142 and two second electrodes 144. The second substrate 140 is a planar structure, and the second conductive layer 142 and the two second electrodes 144 are both disposed on the surface of the second substrate 140. The second conductive layer 142 is disposed opposite to the first conductive layer 122. The two second electrodes 144 are respectively disposed at two ends of the second conductive layer 142 along the D2 direction and are electrically connected to the second conductive layer 142. The two first electrodes 124 of the two second electrodes 144 are disposed orthogonally.

The first substrate 120 is a transparent film and preferably has a certain degree of softness. The second substrate 140 is a transparent substrate, and the material of the second substrate 140 can be selected from hard materials such as glass, quartz, diamond, and plastic. Flexible material. The first base body 120 and the second base body 140 mainly serve as supports. When the first base body 120 and the second base body 140 have a flexible planar structure, the thickness of the first base body 120 and the second base body 140 may be 0.01 mm to 1 cm, and the material thereof may be polycarbonate (PC), polymethyl methacrylate (PMMA), and poly. Polyester materials such as ethylene terephthalate (PET), and polyether oxime (PES), cellulose ester, benzocyclobutene (BCB), polyvinyl chloride (PVC) or acrylic resin.

The material of the first electrode 124 and the second electrode 144 is metal, carbon nanotube or other conductive material as long as conductivity is ensured. The first electrode 124 and the second electrode 144 may be directly formed on the first substrate 120 or the second substrate 140 by a deposition method such as sputtering, electroplating, or electroless plating. In addition, the first electrode 124 and the second electrode 144 may be bonded to the first substrate 120 and the second substrate 140, respectively, by using a conductive adhesive. It can be understood that the first electrode 124 can also be disposed between the first conductive layer 122 and the first substrate 120 or on the first substrate 120 and electrically connected to the first conductive layer 122. The second electrode 144 may also be disposed between the second conductive layer 142 and the second substrate 140 or disposed on the second substrate 140 and electrically connected to the second conductive layer 142. The first electrode 124 and the second electrode 144 are not limited to the above arrangement manner . Any manner in which the first electrode 124 and the first conductive layer 122 described above can be electrically connected and the second electrode 144 and the second conductive layer 142 are electrically connected is within the scope of the present invention. In this embodiment, the first substrate 120 is a polyester film, the second substrate 140 is a glass substrate, and the first electrode 124 and the second electrode 144 are conductive silver paste layers.

At least one of the first conductive layer 122 and the second conductive layer 142 includes a carbon nanotube structure composed of a plurality of carbon nanotubes. Specifically, the carbon nanotube structure includes at least one carbon nanotube film. The carbon nanotube film can be a nano carbon tube film. Each nano carbon tube film comprises a plurality of carbon nanotubes which are substantially parallel to each other and arranged substantially parallel to the surface of the carbon nanotube film. See FIG. 3 for a scanning electron microscope photograph. Specifically, 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 so-called "preferred orientation" refers to the fact that most of the carbon nanotubes in the carbon nanotube film have a large orientation probability in a certain direction, that is, the axial basic along most of the carbon nanotubes in the carbon nanotube film. Extend in the same direction.

The carbon nanotube film can be obtained by directly pulling from the carbon nanotube array, and is a self-supporting structure. The so-called "self-supporting structure" means that the carbon nanotube film can maintain its own specific shape without being supported by a support. Since a large number of carbon nanotubes in the self-supporting structure of the carbon nanotube film are attracted to each other by the van der Waals force, the carbon nanotube film is formed into a specific shape to form a self-supporting structure. The thickness of the carbon nanotube film is from 0.5 nm to 100 μm depending on the height and density of the carbon nanotubes in the carbon nanotube array. The width of the carbon nanotube film is related to the size of the carbon nanotube array for pulling the carbon nanotube film, and the length is not limited. Further, the carbon nanotube structure may include at least two layers of carbon nanotube film laminated or parallel and no Clearance setting. Adjacent carbon nanotubes are tightly bonded by van der Waals force between the films. The number of layers of the carbon nanotube film to be laminated is not limited, and it is only required to have a certain degree of light transmittance. When the carbon nanotube structure is a plurality of laminated carbon nanotube films, the carbon nanotubes in the adjacent two layers of carbon nanotubes may be arranged in the same direction or in different directions, preferably The carbon nanotubes in the adjacent two layers of carbon nanotube film are substantially parallel and their axial directions extend substantially in the same direction. The structure of the carbon nanotube film and the preparation method thereof are described in the Chinese Patent Application No. 200833862, published on Aug. 16, 2008.

The carbon nanotube film has good light transmittance and the light transmittance is up to 75% or more. Preferably, the carbon nanotube film has a transmittance of 90% or more. The carbon nanotube film obtained by the direct drawing can be further improved in light transmittance by a laser treatment or the like.

In the embodiment of the present invention, the first conductive layer 122 and the second conductive layer 142 are both a carbon nanotube structure composed of a single-layer carbon nanotube film. The length of the carbon nanotube film is 30 cm, the width of the carbon nanotube film is 30 cm, and the thickness of the carbon nanotube film is 50 nm. The carbon nanotube film has a transmittance of 95%. The carbon nanotubes in the first conductive layer 122 are disposed to intersect with the carbon nanotubes in the second conductive layer 142. The so-called "cross setting" means that the axial or longitudinal direction of the carbon nanotubes in the first conductive layer 122 forms an angle with the axial or longitudinal direction of the carbon nanotubes in the second conductive layer 142. The angle is greater than 0 degrees and less than or equal to 90 degrees. Preferably, the axial or longitudinal direction of the carbon nanotubes in the first conductive layer 122 is perpendicular to the axial or longitudinal direction of the carbon nanotubes in the second conductive layer 142. The axial or longitudinal direction of the carbon nanotubes in the first conductive layer 122 is a D3 direction. The D3 direction is at an angle α with the D2 direction, wherein α can be greater than 0 degrees and less than or equal to 90 degrees, and the nanometer in the second conductive layer 142 The axial or longitudinal direction of the carbon tube is a D4 direction. The D4 direction is at an angle β to the D2 direction, wherein β may be greater than 0 degrees and less than or equal to 90 degrees. Preferably, both α and β may be greater than 10 degrees and less than 80 degrees, for example, the angle α and the angle β may both be 45 degrees. In the embodiment of the invention, the angle α is 80 degrees and the angle β is 10 degrees. Since the axial or longitudinal direction of the carbon nanotubes in the first conductive layer 122 and the second conductive layer 142 forms an angle with the D2 direction, that is, the carbon nanotubes in the first conductive layer 122 and the second conductive layer 142 The axial or length direction is different from the D2 direction, which can effectively eliminate the streaking phenomenon of the display device 100 and improve the resolution and accuracy of the display device 100. This is because when the axial or longitudinal direction of the carbon nanotubes in the first conductive layer 122 and the second conductive layer 142 coincides with the direction of D2, the carbon nanotubes will block part of the light emitted from the display 20, thereby Streaks appear on the surface of the display device 100, affecting the resolution and accuracy of the display device 100.

When one of the first conductive layer 122 and the second conductive layer 142 includes a carbon nanotube film and the other conductive layer is a previous ITO layer or other material layer, the carbon nanotube is in the film. The axial or longitudinal direction of the carbon nanotubes needs to be at an angle to the direction of D2, wherein the angle can be greater than 0 degrees and less than or equal to 90 degrees. Preferably, the angle is greater than 10 degrees and less than 80 degrees. It can be understood that in the present invention, the carbon nanotubes in any of the conductive layers composed of the carbon nanotube structure must be at an angle to the D2 direction, and the angle can be greater than 0 degrees and less than or equal to 90 degrees to effectively eliminate streaks.

In addition, when at least one of the first conductive layer 122 and the second conductive layer 142 comprises a stacked multi-layer carbon nanotube film, and the nano carbon in the adjacent two carbon nanotube film When the axial or length directions of the tubes are arranged in different directions, it is necessary to ensure that the axial or longitudinal direction of the carbon nanotubes in any of the carbon nanotube films is at an angle to the D2 direction, and the angle is greater than 0 degrees and less than or equal to 90 degrees.

Further, an insulating layer 18 is disposed around the upper surface of the second electrode plate 14. The first electrode plate 12 is disposed on the insulating layer 18, and the first conductive layer 122 of the first electrode plate 12 is disposed opposite to the second conductive layer 142 of the second electrode plate 14. The plurality of transparent dot spacers 16 are disposed between the first electrode plate 12 and the second electrode plate 14. Specifically, the plurality of transparent dot spacers 16 may be disposed on the second conductive layer 142 of the second electrode plate 14, and the plurality of transparent dot spacers 16 are spaced apart from each other. The distance between the first electrode plate 12 and the second electrode plate 14 is 2 to 10 μm. Both the insulating layer 18 and the dot spacer 16 may be made of an insulating transparent resin or other insulating transparent material. Providing the insulating layer 18 and the dot spacers 16 may electrically insulate the first electrode plate 14 from the second electrode plate 12. It can be understood that when the touch screen 10 is small in size, the dot spacer 16 is an optional structure, and it is only necessary to ensure that the first electrode plate 14 is electrically insulated from the second electrode plate 12.

In addition, a transparent protective film 126 may be further disposed on the upper surface of the first electrode plate 12, and the transparent protective film 126 may be made of materials such as tantalum nitride, ytterbium oxide, styrene oxide (BCB), polyester film or acrylic resin. form. The transparent protective film 126 can also be a surface-hardened, smooth scratch-resistant plastic layer, such as a polyethylene terephthalate (PET) film, for protecting the first electrode plate 12 for improved durability. The transparent protective film 126 can also be used to provide some additional functionality such as reducing glare or reducing reflection.

In addition, referring to FIG. 4, in order to reduce the electromagnetic interference generated by the display 20 and avoid the error of the signal emitted from the touch screen 10, a shielding layer 22 may be disposed on the lower surface of the second substrate 140. The shield layer 22 may be formed of a conductive material such as an indium tin oxide (ITO) film, an antimony tin oxide (ATO) film, or a carbon nanotube film. The arrangement of the carbon nanotubes in the carbon nanotube film is not limited and can be oriented Other arrangements are also possible, as long as conductivity and light transmission are ensured. In the embodiment of the present invention, the shielding layer 22 includes a carbon nanotube film, and the carbon nanotubes are aligned in the carbon nanotube film. The carbon nanotube film acts as an electrical grounding point and acts as a mask, thereby enabling the touch screen 10 to operate in an interference-free environment.

Further, a passivation layer 24 may be disposed on the surface of the shielding layer 22 away from the second substrate 140. The passivation layer 24 may be formed of a material such as tantalum nitride or hafnium oxide. The passivation layer 24 can be disposed with a gap 26 spaced from the front side of the display 20. The passivation layer 24 is used as a dielectric layer and protects the display 20 from damage due to excessive external force.

Referring to FIG. 4 , the display device 100 may further include a touch screen controller 30 , a central processing unit 40 , and a display controller 50 . The touch screen controller 30, the central processing unit 40 and the display controller 50 are mutually connected by a circuit. The touch screen controller 30 is electrically connected to the touch screen 20, and the display controller 50 is electrically connected to the display 20. The touch screen controller 30 locates the selection information input by the icon or menu position touched by the touch object 60 such as a finger, and transmits the information to the central processing unit 40. The central processor 40 controls the display 20 display by the display controller 50.

In use, a voltage of 5 V is applied between the first electrode plates 12 and the second electrode plates 14, respectively. The user visually confirms the display of the display 20 disposed under the touch screen 10 while pressing the first electrode plate 12 of the touch screen 10 by a touch object 60 such as a finger or a pen. The first substrate 120 in the first electrode plate 12 is bent such that the first conductive layer 122 of the pressing portion 70 is in contact with the second conductive layer 142 of the second electrode plate 14 to form a conduction. The touch screen controller 30 converts the voltage change in the D2 direction of the first conductive layer 122 with the voltage change in the D3 direction of the second conductive layer 142, respectively, and performs an accurate calculation to convert it into a contact coordinate. Touch screen controller 30 passes the digitized contact coordinates To the central processor 40. The central processor 40 issues corresponding commands according to the contact coordinates, initiates various functional switching of the electronic device, and controls the display 20 display by the display controller 50.

Referring to FIG. 5 , a second embodiment of the present invention provides a display device 200 . The display device 200 includes a touch screen 210 and a display 220 . The touch screen 210 is a capacitive touch screen. The display 220 is disposed directly adjacent to the touch screen 210. Specifically, the touch screen 210 may be disposed at a predetermined distance from the display 220 or may be integrated on the display 220. The display 220 is the same as the display 20 in the first embodiment, and the displayable picture thereof is composed of a plurality of pixel points (not shown), and the plurality of pixel points are arranged in a plurality of lines along the first direction. At the same time, arranged in a plurality of columns along the second direction.

The display device 200 is substantially similar in structure to the display device 100 provided by the first embodiment of the present invention. The touch screen 210 is a capacitive touch screen. The touch screen 210 further includes a substrate 222, a transparent conductive layer 224, at least two electrodes 228, and a transparent protective film 226. The substrate 222 is disposed adjacent to the display 220.

The base 222 has a first surface 221 and a second surface 223 opposite the first surface 221 . The transparent conductive layer 224 is disposed on the first surface 221 of the substrate 222. The first surface 221 is a surface of the substrate 222 away from the display 220. The at least two electrodes 228 are respectively disposed at or near each corner of the transparent conductive layer 224. And forming an electrical connection with the transparent conductive layer 224 for forming an equipotential surface on the transparent conductive layer 224. The transparent protective film 226 can be disposed directly on the transparent conductive layer 224 and the electrode 228.

Specifically, four electrodes 228 may be respectively disposed on the four corners or four sides of the transparent conductive layer 224 for forming a uniform resistance network on the transparent conductive layer 224. In this embodiment, the four strip electrodes 228 are spaced apart from each other. The conductive layer 224 is on the four sides of the same surface. It can be understood that the above-mentioned electrodes 228 can also be disposed on different surfaces of the transparent conductive layer 224. The key point is that the electrodes 228 are disposed such that an equipotential surface is formed on the transparent conductive layer 224. In this embodiment, the electrode 228 is disposed on a surface of the transparent conductive layer 224 away from the base 222.

It can be understood that the four electrodes 228 can also be disposed between the transparent conductive layer 224 and the substrate 222 and electrically connected to the transparent conductive layer 224.

The base 222 is a curved or planar structure. The base 222 is formed of a hard material such as glass, quartz, diamond or plastic or a flexible material. The base 222 functions primarily as a support.

The transparent conductive layer 224 includes a carbon nanotube structure composed of a plurality of carbon nanotubes. The carbon nanotube structure includes at least one layer of carbon nanotube film. The carbon nanotube film can be a nano carbon tube film. When the transparent conductive layer 224 comprises two or more layers of carbon nanotube film, the carbon nanotubes in the adjacent two layers of carbon nanotube film may be arranged in different directions or arranged in the same direction. In order to effectively eliminate the streaking phenomenon of the display device 200, the axial or longitudinal direction of the carbon nanotubes in the transparent conductive layer 224 is different from the D2 direction, that is, the axial direction or length of the carbon nanotubes in the carbon nanotube structure. The direction needs to form an angle with the D2 direction, and the angle is greater than or equal to 0 degrees and less than or equal to 90 degrees. In this embodiment, the transparent conductive layer 224 includes two layers of carbon nanotube film, the carbon nanotubes in the two layers of carbon nanotube film are arranged in different directions, and the carbon carbon in the carbon nanotube film The axial or longitudinal direction of the tube is 45 degrees from the D2 direction.

The material of the four electrodes 228 is a metal, a carbon nanotube film or other conductive material as long as conductivity is ensured. In this embodiment, the four electrodes 228 are strip electrodes 228 composed of a low-resistance conductive metal plating layer such as silver or copper or a metal foil. The transparent protective film 226 is disposed to extend the life of the transparent conductive layer 224 and to limit the capacitance coupled between the contact point and the transparent conductive layer 224. The transparent protective film 226 may be formed of tantalum nitride, hafnium oxide, styrene bromide (BCB), a polyester film, an acrylic resin, or the like. The transparent protective film 226 has a certain hardness and protects the transparent conductive layer 224. It can be understood that the transparent protective film 226 can also be processed by a special process such as reducing glare, reducing reflection, and the like.

In the present embodiment, a ruthenium dioxide layer is disposed on the transparent conductive layer 224 on which the electrode 228 is formed as a transparent protective film 226, and the hardness of the transparent protective film 226 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 226 can be selected as needed. The transparent protective film 226 may be directly bonded to the surface of the transparent conductive layer 224 away from the display 220 by a bonding agent.

In addition, in order to reduce the electromagnetic interference generated by the display 220 and avoid the error of the signal emitted from the touch screen 210, a shielding layer 230 may be disposed on the second surface 223 of the base 222. The shielding layer 230 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 membrane can be a aligned or otherwise structured carbon nanotube membrane. In this embodiment, the carbon nanotube film comprises a plurality of carbon nanotubes, and the plurality of carbon nanotubes are aligned in the carbon nanotube film, and the specific structure thereof and the transparent conductive layer 224 the same. The carbon nanotube film acts as an electrical grounding point and acts as a mask, thereby enabling the touch screen 210 to operate in an interference-free environment. Further, in order to prevent the display 220 from being damaged due to excessive external force, a passivation layer 232 may be disposed between the display 220 and the shielding layer 230. The passivation layer 232 can be tantalum nitride , yttria and other materials are formed.

Referring to FIG. 6, a specific process of displaying the display device 200 according to the second embodiment of the present invention through the touch of the touch screen 210 will be specifically described below.

In use, a predetermined voltage is applied across the transparent conductive layer 224. A voltage is applied to the transparent conductive layer 224 through the electrode 228 to form an equipotential surface on the transparent conductive layer 224. When the user visually confirms the display of the display 220 disposed behind the touch screen 210, the touch object and the transparent conductive layer 224 are operated by pressing or approaching the transparent protective film 226 of the touch screen 210 by a touch object (not shown) such as a finger or a pen. A coupling capacitor is formed between them. For high-frequency currents, the capacitor is a direct conductor, and the finger draws a portion of the current from the contact point. This current flows out of the electrodes on the touch screen 210, 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 250 in the display device 200 accurately calculates the ratio of the four currents. Get the location of the touch point. Thereafter, the touch screen controller 250 transmits the digitized touch location data to the central processing unit 260; thereafter, the central processing unit 260 processes the received data; and then transmits the processed data to the display controller 270, thereby displaying 220 can be displayed according to the information accepted by the display controller 270.

The display device provided by the invention has at least the following advantages: First, since the conductive layer adopting the carbon nanotube structure has uniform resistance distribution and light transmittance and excellent mechanical properties, the touch screen and the display device using the above conductive layer The resolution and accuracy are higher and the durability is better. Secondly, when the touch screen is disposed on the surface of the display, the angle between the axial direction or the length direction of the carbon nanotubes in the carbon nanotube structure used as the conductive layer and the D2 direction is greater than 0 degrees and less than or equal to 90 degrees. The carbon nanotubes in the carbon nanotube structure will not block the part of the light emitted from the display, which is effective Eliminate the streaking phenomenon of the display device and improve the resolution and accuracy of the display device.

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 those 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

12‧‧‧First electrode plate

120‧‧‧First substrate

122‧‧‧First conductive layer

124‧‧‧First electrode

14‧‧‧Second electrode plate

140‧‧‧Second substrate

142‧‧‧Second conductive layer

144‧‧‧second electrode

16‧‧‧ point spacers

18‧‧‧Insulation

20‧‧‧ display

202‧‧‧ pixels

Claims (21)

A display device includes: a touch screen, the touch screen includes a first electrode plate and a second electrode plate, the first electrode plate includes a first substrate, a first conductive layer and two first electrodes, The first conductive layer is disposed on a surface of the first substrate, the two first electrodes are electrically connected to the first conductive layer; the second electrode plate is spaced apart from the first electrode plate, and the second electrode plate includes a first electrode plate a second substrate, a second conductive layer and two second electrodes, the second conductive layer is disposed on a surface of the second substrate and opposite to the first conductive layer, the two second electrodes and the first a second conductive layer electrically connected; and a display disposed adjacent to the second electrode plate of the touch screen, the display includes a plurality of pixel points, the plurality of pixel points being arranged in a plurality of rows along a first direction and Arranging into a plurality of columns along a second direction; the improvement is that the second conductive layer and the first conductive layer comprise a carbon nanotube structure, wherein the carbon nanotube structure is substantially in the same direction by a plurality of carbon nanotubes Preferred orientation arrangement, said The axial direction of the carbon nanotubes in a conductive layer forms an angle α with the second direction, wherein α is greater than 0 degrees and less than 90 degrees, and the axial direction of the carbon nanotubes in the second conductive layer The second direction forms an angle β, where β is greater than 0 degrees and less than 90 degrees. The display device of claim 1, wherein each pixel point comprises a red display unit, a green display unit, and a blue display unit, wherein the red display unit, the green display unit, and the blue display unit are consecutive The ground is cyclically arranged along the first direction. The display device of claim 1, wherein the angle of the included angle is greater than 10 degrees and less than 80 degrees. The display device of claim 3, wherein the angle of the included angle is 45 degrees. The display device of claim 1, wherein the carbon nanotube structure comprises at least one carbon nanotube film. The display device of claim 5, wherein the carbon nanotube structure comprises a plurality of carbon nanotube film stacking arrangements or parallel and gapless settings. The display device of claim 6, wherein the carbon nanotube film comprises a plurality of carbon nanotubes connected end to end and arranged in a preferred orientation in the same direction, and the vanadium force is passed between the carbon nanotubes Connected to each other. The display device according to claim 5, wherein the carbon nanotube film has a thickness of from 0.5 nm to 100 μm. The display device of claim 1, wherein the two first electrodes are disposed at both ends of the first conductive layer along the first direction and are electrically connected to the first conductive layer, the two The two electrodes are disposed at both ends of the second conductive layer along the second direction and are electrically connected to the second conductive layer. The display device of claim 1, wherein the carbon nanotubes in the first conductive layer are disposed to intersect with the carbon nanotubes in the second conductive layer. The display device of claim 1, wherein the touch screen further comprises an insulating layer and a plurality of dot spacers, the insulating layer is disposed on a periphery of the surface of the second electrode plate, and the first electrode plate is disposed On the insulating layer, the plurality of dot spacers are disposed between the first electrode plate and the second electrode plate. The display device according to claim 1, wherein the material of the first substrate and the second substrate is polycarbonate, polymethyl methacrylate, polyethylene terephthalate or polyether oxime. , cellulose ester, benzocyclobutene, polyvinyl chloride or acrylic resin. The display device of claim 1, wherein the touch screen and the display are spaced apart or the touch screen is integrated on the display. The display device of claim 1, wherein the touch screen further comprises a shielding layer disposed on a surface of the touch screen second substrate away from the second conductive layer. The display device according to claim 14, wherein the shielding layer is an indium tin oxide film, a tantalum tin oxide film or a carbon nanotube film. The display device of claim 14, wherein the display device further comprises a passivation layer disposed on a surface of the shielding layer away from the second substrate of the touch screen. The display device of claim 16, wherein the material of the passivation layer is tantalum nitride or hafnium oxide. A display device comprising: a touch screen, the touch screen comprising a substrate, a transparent conductive layer and at least two electrodes, the substrate having a first surface, the transparent conductive layer being disposed on the first surface of the substrate The at least two electrodes are spaced apart and electrically connected to the transparent conductive layer; and a display disposed adjacent to and adjacent to the base of the touch screen, the display comprising a plurality of pixel points, the plurality of pixel points along a The first direction is arranged in a plurality of rows and arranged in a plurality of columns along a second direction; and the improvement is that the transparent conductive layer comprises a carbon nanotube structure, and the carbon nanotube structure is substantially along a plurality of carbon nanotubes The same direction is arranged in a preferred orientation, and the axial directions of the plurality of carbon nanotubes are respectively at an angle with the first direction and the second direction, and the angle of the angle is greater than 0 degrees and less than 90 degrees. The display device of claim 18, wherein each pixel point comprises a red display unit, a green display unit, and a blue display unit, wherein the red display unit, the green display unit, and the blue display unit are consecutive The ground is cyclically arranged along the first direction. The display device of claim 18, wherein the angle of the included angle is greater than 10 degrees and less than 80 degrees. The display device of claim 20, wherein the angle of the included angle is 45 degrees.