TWI416210B - Liquid crystal display with touch panel - Google Patents

Abstract

The present invention relates to a liquid crystal display with a touch panel. The liquid crystal display with a touch panel includes a liquid crystal display and a resistive touch panel. The resistive touch panel includes a first electrode plate and a second electrode plate. The first electrode plate includes a first substrate and a first transparent conductive layer. The second electrode plate includes a public substrate and a second transparent conductive layer. The first transparent conductive layer is fixed face to face with the second transparent conductive layer, and at least one of the first transparent conductive layer and second transparent conductive layer is a conductivity anisotropy layer. The liquid crystal display includes a first a polarizer, an upper substrate, an upper electrode, a first alignment layer, a liquid crystal layer, a second alignment layer, a TFT panel and a second polarizer in turn from up to down. The upper substrate is used as the public substrate of the resistive touch panel.

Description

Touch screen

The invention relates to a liquid crystal display, in particular to a touch liquid crystal display.

The liquid crystal display is one of the best display modes because of its low power consumption, miniaturization, and high-quality display. In recent years, with the development of high-performance and diversified electronic devices such as mobile phones, touch navigation systems, integrated computer monitors, and interactive TVs, electronic devices with a light-sensitive touch screen mounted on the display surface of liquid crystal displays have gradually increase. The user of the electronic device visually confirms the display content of the liquid crystal display located on the back of the touch screen through the touch screen, and presses the touch screen to operate by using a finger or a pen. Thereby, various functions of the electronic device using the liquid crystal display can be operated.

The touch screen can be generally divided into four types according to the working principle and the transmission medium, which are resistive, capacitive inductive, infrared, and surface acoustic wave. Among them, the resistive touch screen is widely used due to its advantages of high resolution, high sensitivity and durability. The resistive touch screen of the prior art generally includes a first substrate, a surface of the first substrate is formed with a first transparent conductive layer, a second substrate, a surface of the second substrate is formed with a second transparent conductive layer, and the second transparent conductive layer The layer is disposed opposite to the first transparent conductive layer; and a plurality of dot spacers are disposed between the first transparent conductive layer and the second transparent conductive layer.

However, integrating the previous resistive touch screen into the liquid crystal display will inevitably increase the thickness of the liquid crystal display, which is disadvantageous for the miniaturization and thinning of the liquid crystal display and the electronic device using the liquid crystal display.

In view of this, it is necessary to provide a touch type liquid crystal display having a relatively thin thickness.

A touch-type liquid crystal display comprises: a liquid crystal display and a resistive touch screen, wherein the resistive touch screen comprises: a first electrode plate, the first electrode plate comprises a first substrate and a first transparent conductive layer And a second electrode plate comprising a common substrate and a second transparent conductive layer, wherein the first transparent conductive layer is disposed opposite to the second transparent conductive layer, wherein at least one transparent conductive layer is a conductive anisotropic film; the liquid crystal display comprises, in order from top to bottom, a first polarizer; an upper substrate; an upper electrode; a first alignment layer; a liquid crystal layer; a second alignment layer; a transistor panel; and a second polarizer, wherein the upper substrate is a common substrate of the resistive touch screen, and the first polarizer is disposed between the second transparent conductive layer and the common substrate.

Compared with the prior art, the touch screen in the touch liquid crystal display provided by the present invention shares a common substrate with the liquid crystal display, thereby having a thinner thickness and a simple structure, simplifying the manufacturing process, reducing the manufacturing cost, and improving the backlight. Utilization improves display quality.

10;20‧‧‧Touch LCD

12;22‧‧‧ touch screen

14;24‧‧‧LCD display

110; 210‧‧‧ first electrode plate

112; 212‧‧‧ first substrate

114; 214a; 214c‧‧‧ first transparent conductive layer

116;216a;216c;216d‧‧‧first electrode

120; 220‧‧‧ second electrode plate

124; 224‧‧‧ second transparent conductive layer

126;226a;226b‧‧‧second electrode

132; 232‧‧‧ point spacers

134; 234‧‧ ‧ insulating frame

136;236‧‧‧Transparent protective layer

142; 242‧‧‧ first alignment layer

144; 244‧‧‧ upper electrode

146;246‧‧‧ public base

148; 248‧‧‧ first polarizer

152; 252‧‧‧ second alignment layer

154; 254‧‧‧ Thin film transistor panel

158; 258‧‧‧second polarizer

160; 260‧‧‧ liquid crystal layer

218‧‧‧fourth electrode

228‧‧‧third electrode

1 is a cross-sectional view of a touch liquid crystal display according to a first embodiment of the present invention.

2 is a schematic exploded perspective view of a touch screen in a touch liquid crystal display according to a first embodiment of the present invention.

3 is a scanning electron micrograph of a carbon nanotube film in a touch liquid crystal display provided by a first embodiment of the present invention.

4 is a cross-sectional view of a touch liquid crystal display according to a second embodiment of the present invention.

FIG. 5 is a first structural diagram of a first electrode plate and a second electrode plate of a touch screen in a touch liquid crystal display according to a second embodiment of the present invention.

FIG. 6 is a second schematic structural diagram of a first electrode plate and a second electrode plate of a touch screen in a touch liquid crystal display according to a second embodiment of the present invention.

FIG. 7 is a third structural diagram of a first electrode plate and a second electrode plate of a touch screen in a touch liquid crystal display according to a second embodiment of the present invention.

FIG. 8 is a fourth structural diagram of a first electrode plate and a second electrode plate of a touch screen in a touch liquid crystal display according to a second embodiment of the present invention.

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

Referring to FIG. 1 , a first embodiment of the present invention provides a touch liquid crystal display 10 . The touch-type liquid crystal display 10 includes a resistive touch screen 12 and a liquid crystal display 14.

The resistive touch screen 12 is a four-wire, five-wire, seven-wire, eight-wire structure resistive type touch screen. Referring to FIG. 2 , in the embodiment, the touch screen 12 is a four-wire structured resistive touch screen, and the touch screen 12 includes a first electrode plate 110 , a second electrode plate 120 , and a plurality of dot spacers. 132. An insulating frame 134 and a transparent protective layer 136. The first electrode plate 110 is opposite to the second electrode plate 120. The plurality of dot spacers 132 and the insulating frame 134 are disposed between the first electrode plate 110 and the second electrode plate 120. The transparent protective layer 136 is disposed on an upper surface of the first electrode plate 110. In this specification, “upper” and “lower” refer only to the relative orientation, “upper” refers to the direction of the touch surface near the touch-type liquid crystal display, and “lower” refers to the touch surface that is far from the touch-type liquid crystal display. The direction.

The first electrode plate 110 includes a first substrate 112, a first transparent conductive layer 114, and two first electrodes 116 in order from top to bottom. The first transparent conductive layer 114 and the two first electrodes 116 are disposed on the lower surface of the first substrate 112, and the two first electrodes 116 are along the first direction of the first transparent conductive layer 114. The X direction in FIG. 2 is spaced apart from the first transparent conductive layer 114 and electrically connected to the first transparent conductive layer 114.

The second electrode plate 120 includes a common substrate 146 , a second transparent conductive layer 124 , and two second electrodes 126 . The second transparent conductive layer 124 and the two second electrodes 126 are spaced apart from the first transparent conductive layer 114 and the two first electrodes 116 by a distance of 2 to 10 micrometers. The two second electrodes 126 are disposed at two ends of the second transparent conductive layer 124 along the second direction of the second transparent conductive layer 124 in the Y direction of FIG. 2, and are electrically conductive with the second transparent conductive layer 124. Layer 124 is electrically connected. The second transparent conductive layer 124 and the two second electrodes 126 are disposed opposite to the first transparent conductive layer 114. Wherein, the first direction and the second direction are as long as they can intersect can. In this embodiment, the X direction is perpendicular to the Y direction.

The liquid crystal display 14 and the touch screen 12 share the common substrate 146, and the liquid crystal display 14 includes a first polarizer 148, a common substrate 146, an upper electrode 144, and a first layer from top to bottom. The alignment layer 142, a liquid crystal layer 160, a second alignment layer 152, a thin film transistor panel 154, and a second polarizer 158. The first polarizer 148 is disposed between the second transparent conductive layer 124 and the common base 146.

The first polarizer 148 is disposed on a lower surface of the second transparent conductive layer 124 of the touch screen 12, and an upper surface of the common substrate 146. The upper electrode 144 is disposed on a lower surface of the common substrate 146. The first alignment layer 142 is disposed on a lower surface of the upper electrode 144. The second alignment layer 152 is disposed opposite to the first alignment layer 142. The liquid crystal layer 160 is disposed between the first alignment layer 142 and the second alignment layer 152. The thin film transistor panel 154 is disposed on a lower surface of the second alignment layer 152. The second polarizer 158 is disposed on a lower surface of the thin film transistor panel 154. It will be appreciated that other layers may be selectively interposed between the various layers as desired for various functions.

The common substrate 146 is both the substrate of the touch screen 12 and the upper substrate of the liquid crystal display 14. Therefore, the touch type liquid crystal display panel 10 has a thin thickness and a simple structure, simplifies the manufacturing process, reduces the manufacturing cost, improves the utilization ratio of the backlight, and improves the display quality. It can be understood that the specific structure of the liquid crystal display 14 is not limited to the structure of the first embodiment described above, as long as the liquid crystal display 14 and the touch screen 12 share the common substrate 146 within the protection scope of the present invention.

Specifically, the common base 146 is a transparent thin plate, and the material of the common base 146 may be glass, quartz, diamond, plastic or resin. The common base 146 has a thickness of 1 mm to 1 cm. In this embodiment, the material of the common base 146 is glass and has a thickness of 5 mm. It is to be understood that the material forming the common substrate 146 is not limited to the materials listed above, and any material that can serve as a support and has a good transparency is within the scope of the present invention.

The first substrate 112 in the touch screen 12 is a film or sheet that is transparent and has a certain degree of softness. The material of the first substrate 112 is a flexible material such as plastic or resin. Specifically, the flexible material comprises a polyester material such as polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), and polyether enamel (PES), Materials such as cellulose ester, polyvinyl chloride (PVC), benzocyclobutene (BCB) and acrylic resin. The first substrate 112 has a thickness of 1 mm to 1 cm. In this embodiment, the first substrate 112 is PET. It can be understood that the material forming the first substrate 112 is not limited to the materials listed above, as long as the first substrate 112 can serve as a support, and has certain flexibility and good transparency.

In the touch screen 12, at least one of the first transparent conductive layer 114 and the second transparent conductive layer 124 is a conductive anisotropic film, and the resistivity of the conductive anisotropic film in one direction The ratio of resistivity to any other direction is less than or equal to 1:2. The conductive anisotropic film is a carbon nanotube layer. When one of the first transparent conductive layer 114 and the second transparent conductive layer 124 is a carbon nanotube layer, the other transparent conductive layer is an ITO layer, an ATO layer or another material layer.

The carbon nanotube layer comprises a plurality of carbon nanotubes, and the plurality of carbon nanotubes are arranged in a preferred orientation in the same direction, so that the carbon nanotube layer has a small electrical resistance in the direction. Resistance in other directions. Most of the carbon nanotubes in the carbon nanotube layer extend substantially parallel to the surface of the carbon nanotube layer, and have a lower resistivity in the direction in which the carbon nanotubes extend than in other directions. The carbon nanotube layer comprises at least one carbon nanotube film. When the carbon nanotube layer comprises a plurality of carbon nanotube film, the carbon nanotube film may be disposed in a substantially parallel gap-free coplanar arrangement or stacked. The thickness of the carbon nanotube layer is not limited and may be selected according to requirements; the thickness of the carbon nanotube layer is 0.5 nm to 100 μm; preferably, the thickness of the carbon nanotube layer is 100 nm~ 200 nm.

Please refer to Figure 3. The carbon nanotube film is a self-supporting structure composed of a plurality of carbon nanotubes. The plurality of carbon nanotubes are arranged in a preferred orientation along the same direction. Most of the carbon nanotubes in the carbon nanotube film are oriented in the same direction. Moreover, the overall extension direction of the majority of the carbon nanotubes is substantially parallel to the surface of the carbon nanotube film. Further, most of the carbon nanotubes in the carbon nanotube film are connected end to end by van der Waals force. Specifically, each of the carbon nanotubes of the majority of the carbon nanotubes extending in the same direction in the carbon nanotube film is connected end to end with the carbon nanotubes adjacent in the extending direction by van der Waals force . Of course, there are a small number of randomly arranged carbon nanotubes in the carbon nanotube film, and these carbon nanotubes do not significantly affect the overall orientation of most of the carbon nanotubes in the carbon nanotube film. The carbon nanotube film does not need a large area of support, but as long as the supporting force is provided on both sides, the whole film can be suspended and maintained in a self-membranous state, that is, the carbon nanotube film is placed (or fixed) at intervals. When the two supports are disposed, the carbon nanotube film located between the two supports can be suspended to maintain its own film state.

Specifically, the majority of the nanocarbons extending substantially in the same direction in the carbon nanotube film The tube, which is not absolutely linear, can be appropriately bent; or it is not completely aligned in the extending direction, and can be appropriately deviated from the extending direction. Therefore, it is not possible to exclude partial contact between the carbon nanotubes juxtaposed in the majority of the carbon nanotubes extending substantially in the same direction of the carbon nanotube film.

Specifically, the carbon nanotube film comprises a plurality of continuous and aligned carbon nanotube segments. The plurality of carbon nanotube segments are connected end to end by van der Waals force. Each of the carbon nanotube segments includes a plurality of mutually parallel carbon nanotubes, and the plurality of mutually parallel carbon nanotubes are tightly coupled by van der Waals force. The carbon nanotube segments have any length, thickness, uniformity, and shape. The carbon nanotubes in the carbon nanotube film are arranged in a preferred orientation in the same direction.

The carbon nanotube film can be obtained by directly drawing from a carbon nanotube array. It can be understood that a plurality of carbon nanotube films can be laid in parallel and without gaps coplanar or/and laminated. Each nano carbon tube film may have a thickness of 0.5 nm to 100 μm. When the carbon nanotube layer comprises a plurality of laminated carbon nanotube film, the arrangement direction of the carbon nanotubes in the adjacent carbon nanotube film forms an angle α, 0° ≦ α ≦ 90° . The structure of the carbon nanotube film and the preparation method thereof are described in the Taiwan Patent Application Publication No. TW200833862, which is published on Aug. 16, 2008. The carbon nanotube layer has an ideal transmittance, and the visible light transmittance of the single-layer carbon nanotube film is greater than 85%, and the number of layers of the carbon nanotube film in the carbon nanotube layer is not limited, as long as It can have ideal light transmittance.

In addition, the carbon nanotube layer may further be a composite material layer comprising the above-mentioned carbon nanotube film and a reinforcing material. The reinforcing material is uniformly distributed in a gap between the carbon nanotubes in the carbon nanotube film. Wherein, the reinforcing material may be one Polymer material or metal material. The polymer material is a transparent polymer material, and the specific material thereof is not limited, and includes polystyrene, polyethylene, polycarbonate, polymethyl methacrylate (PMMA), polycarbonate (PC), and terephthalic acid. Ethylene glycolate (PET), phenylcyclobutene (BCB), polycycloolefin, and the like. The metal material is a metal material such as nickel, gold, platinum, iron, cobalt or copper.

Since the carbon nanotube layer comprises at least one carbon nanotube film, the carbon nanotube film is a self-supporting film, so the carbon nanotube layer is also a self-supporting film, which can be directly A method of laying is formed on a surface of at least one of the first substrate 112 and the common substrate 146.

In this embodiment, the first transparent conductive layer 114 and the second transparent conductive layer 124 are both the carbon nanotube layer, and the carbon nanotube layer is a layer of carbon nanotube film. Since the carbon nanotubes in the carbon nanotube layer have a large specific surface area, the carbon nanotube layer has a large viscosity, so the carbon nanotube layer can directly adhere to the first layer. The upper surface of the polarizer 148, that is, the second transparent conductive layer 124 may be disposed on the upper surface of the first polarizer 148 by a van der Waals force. It can be understood that the second transparent conductive layer 124 can also be disposed on the upper surface of the first polarizer 148 by a transparent optical glue or UV glue.

The two first electrodes 116 and the two second electrodes 126 of the touch screen 12 are formed of a conductive material, and may be selected as a metal layer, a conductive polymer layer or a carbon nanotube layer. The material of the metal layer may be selected from a metal having good conductivity such as gold, silver or copper. The material of the conductive polymer layer may be selected from the group consisting of polyacetylene, polyparaphenylene, polyaniline, polyimibe, polypyrrole, polythiophene and the like. In this embodiment, the two first electrodes 116 and the two second electrodes 126 are conductive silver paste strips formed by screen printing.

Further, the carbon nanotube layer may further include an etched or laser treated carbon nanotube film. The carbon nanotube film is subjected to laser treatment to form a plurality of laser cutting lines on the surface thereof, thereby further enhancing the laminated carbon nanotube electrical anisotropy.

In the touch screen 12, the plurality of dot spacers 132 are disposed on the second transparent conductive layer 124 of the second electrode plate 120, and the plurality of dot spacers 132 are spaced apart from each other. The insulating frame 134 is disposed between the lower surface of the first electrode plate 110 and the upper surface of the second electrode plate 120. The plurality of dot spacers 132 and the insulating frame 134 may be made of an insulating resin or other insulating material, and the dot spacers 132 are made of a transparent material. The plurality of dot spacers 132 and the insulating frame 134 may electrically insulate the first electrode plate 110 from the second electrode plate 120. It can be understood that when the touch screen 12 is small in size, the plurality of dot spacers 132 are optional structures as long as the insulating frame 134 can ensure that the first electrode plate 110 is electrically insulated from the second electrode plate 120.

The transparent protective layer 136 of the touch screen 12 is disposed on the upper surface of the first substrate 112. The transparent protective layer 136 may be directly bonded to the first substrate 112 by a bonding agent, or may be pressed together with the first substrate 112 by a hot pressing method. The transparent protective layer 136 may be a surface-hardened, smooth scratch-resistant plastic layer or a resin layer formed of a material such as phenylcyclobutene (BCB), polyester, or acrylic resin. In this embodiment, the material forming the transparent protective layer 136 is polyethylene terephthalate (PET) for protecting the first electrode plate 110 to improve durability. The transparent protective layer 136 can be used to provide additional functions such as glare reduction or reflection reduction after special processing.

In the liquid crystal display panel 14, the material of the first polarizer 148 is prior art A commonly used polarizing material, such as a dichroic organic polymer material, may specifically be an iodine material or a dye material. The material of the second polarizer 158 may be the same as the material of the first polarizer 148. The first polarizer 148 has a thickness of 1 micrometer to 0.5 millimeter. The first polarizer 148 and the second polarizer 158 function to polarize light emitted from the backlight module disposed on the lower surface of the touch liquid crystal display 10 to obtain light polarized in a single direction. The polarization direction of the second polarizer 158 may be perpendicular or parallel to the polarization direction of the first polarizer 148. In this embodiment, the polarizing material of the first polarizer 148 and the second polarizer 158 is a dichroic polyvinyl alcohol, and the polarization direction of the first polarizer 148 is perpendicular to the polarization direction of the second polarizer 158. .

The material of the upper electrode 144 may be a transparent conductive film such as ITO, which serves to apply an alignment voltage to the liquid crystal layer 160.

In the liquid crystal display panel 14, the lower surface of the first alignment layer 142 may include a plurality of parallel first trenches, and the upper surface of the second alignment layer 152 may include a plurality of parallel second trenches The direction in which the first trenches are arranged is perpendicular to the direction in which the second trenches are arranged. The first trench and the second trench may align the liquid crystal molecules, and may be formed by a method of rubbing in the prior art, a method of oblique vapor deposition SiO _x film, and a method of micro-groove processing on the film. Since the first trench of the first alignment layer 142 is perpendicular to the alignment direction of the second trench of the second alignment layer 152, the liquid crystal molecules between the first alignment layer 142 and the second alignment layer 152 are in two alignments. The alignment angle between the layers produces a 90 degree rotation, which acts as an optical rotation. The materials of the first alignment layer 142 and the second alignment layer 152 are the same. Specifically, it may be polystyrene and its derivatives, polyimine, polyvinyl alcohol, polyester, epoxy resin, polyurethane, polydecane, and the like. In this embodiment, the first alignment layer 142 and the second alignment layer 152 are made of polyimide and have a thickness of 1 to 50 micrometers.

The liquid crystal layer 160 includes a plurality of long rod-shaped liquid crystal molecules. The liquid crystal material of the liquid crystal layer 160 is a liquid crystal material commonly used in the prior art. The thickness of the liquid crystal layer 160 is 1 to 50 micrometers. In the embodiment, the thickness of the liquid crystal layer 160 is 5 micrometers.

The specific structure inside the thin film transistor panel 154 is not shown in FIG. 1, but those skilled in the art may know that the thin film transistor panel 154 may further include a third substrate and a plurality of upper surfaces formed on the third substrate. A thin film transistor, a plurality of pixel electrodes, and a display driving circuit. The plurality of thin film transistors are connected in one-to-one correspondence with the pixel electrodes, and the plurality of thin film transistors are electrically connected to the display driving circuit through the source lines and the gate lines. Preferably, the plurality of thin film transistors and the plurality of pixel electrodes are disposed in an array on the upper surface of the third substrate.

Referring to FIG. 4, a second embodiment of the present invention provides a touch liquid crystal display 20. The touch screen LCD 20 includes a resistive touch screen 22 and a liquid crystal display 24. The resistive touch panel 22 includes a first electrode plate 210, a second electrode plate 220, a plurality of dot spacers 232, an insulating frame 234, and a transparent protective layer 236. The first electrode plate 210 and the second electrode plate 220 are disposed opposite to each other, and the plurality of dot spacers 232 and the insulating frame 234 are disposed between the first electrode plate 210 and the second electrode plate 220. The transparent protective layer 236 is disposed on an upper surface of the first electrode plate 210. The structure of the liquid crystal display 24 is a first polarizer 248, a common substrate 246, an upper electrode 244, a first alignment layer 242, a liquid crystal layer 260, and a second alignment layer 252. A thin film transistor panel 254 and a second polarizer 258.

The structure of the touch liquid crystal display 20 provided in this embodiment is substantially similar to the structure of the touch liquid crystal display 10 provided in the first embodiment. The difference is that the structure of the resistive touch screen 22 provided by the embodiment is different from the structure of the resistive touch screen 12 provided by the first embodiment. The resistive touch screen 22 is a multi-point resistive touch screen.

Referring to FIG. 5, the first electrode plate 210 includes a first substrate 212, a first transparent conductive layer 214a disposed on a lower surface of the first substrate 212, and a first electrode 216a. The first transparent conductive layer 214a is a rectangular indium tin oxide (ITO) film; the first electrode 216a is continuously disposed around the first transparent conductive layer 214a and electrically connected to the first transparent conductive layer 214a. The material of the first electrode 216a is the same as that of the first electrode 116 in the first embodiment. In this embodiment, the material of the first electrode 216a is a conductive silver paste strip formed by a screen printing method.

The second electrode plate 220 includes a common substrate 246, a second transparent conductive layer 224, a second electrode 226a, and a plurality of third electrodes 228. The first polarizer 248 is disposed between the common substrate 246 and the second transparent conductive layer 224 , and the second transparent conductive layer 224 is disposed on an upper surface of the first polarizer 248 . The second transparent conductive layer 224 is a conductive anisotropic film, that is, its resistivity in a two-dimensional space is different. Specifically, the resistivity of the second transparent conductive layer 224 in the first direction, that is, the X direction in FIG. 5 is greater than the resistivity in the Y direction; in this embodiment, the material and structure of the second transparent conductive layer 224 The second transparent conductive layer 124 in the first embodiment has the same material and structure, and is a layer of carbon nanotube film. Most of the carbon nanotubes in the carbon nanotube film are in the second direction, that is, in FIG. The Y direction extends. The carbon nanotube film is less resistive along the direction of extension of most of the carbon nanotubes, that is, the Y direction in FIG. The resistivity of the direction; the ratio of the resistivity of the second transparent conductive layer 224 in the X direction to the resistivity in the Y direction is greater than or equal to 10.

The second electrode 226a is an elongated electrode disposed on a side of the second transparent conductive layer 224 along a second direction perpendicular to the second transparent conductive layer 224, that is, the second electrode 226a is perpendicular to The Y direction in FIG. 5 is also perpendicular to the direction in which most of the carbon nanotubes in the carbon nanotube film are extended, and extends in the X direction in FIG. 5 on the second transparent conductive layer 224. On one side, the second electrode 226a is electrically connected to the second transparent conductive layer 224. The material of the second electrode 226a is the same as the material of the first electrode 116 and the second electrode 126 in the first embodiment. In this embodiment, the second electrode 226a is a conductive silver paste strip formed by a screen printing method.

The plurality of third electrodes 228 are spaced apart from one side of the second transparent conductive layer 224 and disposed opposite to the second electrode 226a. Each of the third electrodes 228 is electrically connected to the second transparent conductive layer 224. Since the second transparent conductive layer 224 has conductive anisotropy, the plurality of third electrodes 228 divide the second transparent conductive layer 224 into a plurality of corresponding strip-shaped conductive channels. The material of the third electrode 228 is the same as that of the first electrode 116 and the second electrode 126 in the first embodiment. In this embodiment, the third electrode 228 is formed by a screen printing method.

The driving manner of the touch screen 22 is that the first electrode 216a is generally grounded, that is, the voltage of the first transparent conductive layer 214a is 0 volts. The second electrode 226a is generally connected to a stable DC voltage, such as 10 volts, and the second transparent conductive layer 224 has a voltage of 10 volts. The plurality of third electrodes 228 are configured to detect a voltage change of a corresponding position of the second transparent conductive layer 224 to provide information for touch positioning.

The first electrode plate 210 and the second electrode plate 220 provided by the present invention have four structures according to the structure and arrangement of the electrodes in the first electrode plate 210 and the second electrode plate 220. FIG. 5 is a first schematic structural view of the first electrode plate 210 and the second electrode plate 220.

The second embodiment of the first electrode plate 210 and the second electrode plate 220 is provided in the embodiment of the present invention. Referring to FIG. 6, the second electrode plate 220 includes a plurality of second electrodes 226b and a plurality of third electrodes 228. The plurality of second electrodes 226b and the plurality of third electrodes 228 are perpendicular to the nanocarbon. The majority of the carbon nanotubes in the tube stretch are disposed on opposite sides of the second transparent conductive layer 224 and are electrically connected to the second transparent conductive layer 224. That is, the plurality of second electrodes 226b and the plurality of third electrodes 228 are respectively spaced apart in the first direction, that is, in the X direction. The structure of the first electrode plate 210 in FIG. 6 is the same as that of the first electrode plate 210 in FIG.

The driving method of the touch panel 22 is that the second electrode 226b and the third electrode 228 can be used as a voltage input electrode or as a detection voltage output electrode. When the second electrode 226b is connected to the voltage input electrode as a stable DC voltage, the third electrode 228 functions as a detection voltage output electrode; when the third electrode 228 is used as a voltage input electrode to connect a stable DC voltage, the second electrode 226b As a detection voltage output electrode. That is, the second electrode 226b and the third electrode 228 are driven by rotating input/output, which can increase the positioning accuracy of the touch screen 22, thereby increasing the positioning accuracy of the touch liquid crystal display 20.

The third embodiment of the first electrode plate 210 and the second electrode plate 220 is provided in the embodiment of the present invention. Referring to FIG. 7, the structure of the first electrode plate 210 in this embodiment is similar to the structure of the second electrode plate 220 in FIG. 5, that is, the first electrode plate 210 includes a layer of A first transparent conductive layer 214c composed of a carbon nanotube film, a strip-shaped first electrode 216c and a plurality of spaced-apart fourth electrodes 218. Specifically, most of the carbon nanotubes in the first transparent conductive layer 214c extend in a first direction, that is, an X direction, and the elongated first electrode 216c is along a majority of the nanometers perpendicular to the first transparent conductive layer 214c. The direction in which the carbon nanotube extends is disposed on one side of the first transparent conductive layer 214c, that is, the elongated first electrode 216c is perpendicular to the X direction; the plurality of fourth electrodes 218 and the elongated first electrode 216c are spaced apart and disposed opposite to each other and disposed on the other side of the first transparent conductive layer 214c. The resistivity of the first transparent conductive layer 214c in the Y direction is greater than its resistivity in the X direction. The structure of the second electrode plate 220 is the same as that of the second electrode plate 220 in FIG.

The driving manner of the touch screen 22 is: when determining the abscissa of the touch point, the first electrode 216c and/or the fourth electrode 218 are grounded; and the second electrode 226a is connected to a stable DC voltage, such as 10 volts. The voltage of the plurality of third electrodes 228 is measured to determine the abscissa of the touch point. When determining the ordinate of the touch point, the second electrode 226a and/or the third electrode 228 are grounded, and the first electrode 216c is connected to a stable DC voltage, such as 10 volts, and the plurality of fourth electrodes 218 are measured. The voltage determines the ordinate of the touch point.

In addition, the driving manner of the touch screen 22 may further be: sequentially scanning the plurality of fourth electrodes 218 and the plurality of third electrodes 228, and respectively measuring the change of the voltage thereof, and simultaneously, for the first electrode 216c in the non-measurement state. And the second electrode 226a is respectively applied with a fixed voltage, such as 5 volts, 10 volts or 0 volts, etc., so as to ensure that the fourth electrode 218 or the third electrode 228 of the non-measuring point has a stable voltage, reducing the pair to be in a measuring state. The influence of the fourth electrode 218 or the third electrode 228 also makes the measurement state The voltage measurement of the fourth electrode 218 or the third electrode 228 is more accurate.

The fourth embodiment of the present invention provides a fourth structure of the first electrode plate 210 and the second electrode plate 220. Referring to FIG. 8 , the first electrode plate 210 of the embodiment includes a plurality of first electrodes 216 d and a plurality of fourth electrodes 218 . The first transparent conductive layer 214 c is a conductive anisotropic film. Specifically, the first The transparent conductive layer 214c is a layer of carbon nanotube film, and most of the carbon nanotubes of the carbon nanotube film extend in the first direction, that is, the X direction. The first transparent conductive layer has a higher resistivity in the X direction than the other resistivity in the first direction. The plurality of first electrodes 216d and the plurality of fourth electrodes 218 are respectively disposed on the two sides of the first transparent conductive layer 214c along the X direction in the second direction, that is, the Y direction, and the first transparent conductive layer 214c Electrically connected such that most of the carbon nanotubes in the carbon nanotube film are extended from the plurality of first electrodes 216d to the plurality of fourth electrodes 218.

The driving manner of the touch screen 22 is: when the first electrode 216d and the fourth electrode 218 are simultaneously grounded, the second electrode 226b and the third electrode 228 are alternately connected to a high voltage, and the opposite side third electrode is measured. 228. The voltage of the second electrode 226b changes to determine the abscissa of the touch point. When the second electrode 226b and the third electrode 228 are simultaneously grounded, the first electrode 216d and the fourth electrode 218 are alternately connected to a high voltage, and are determined by measuring a voltage change with respect to the fourth electrode 218 and the first electrode 216d. Touch the ordinate of the point.

The touch screen in the touch liquid crystal display provided by the embodiment of the invention shares a common substrate with the liquid crystal display. Therefore, the touch liquid crystal display has a thin thickness and a simple structure, which simplifies the manufacturing process, reduces the manufacturing cost, and improves the manufacturing cost. The utilization of the backlight improves the display quality.

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.

10‧‧‧Touch LCD

12‧‧‧ touch screen

14‧‧‧LCD screen

110‧‧‧First electrode plate

112‧‧‧First substrate

114‧‧‧First transparent conductive layer

120‧‧‧Second electrode plate

124‧‧‧Second transparent conductive layer

126‧‧‧second electrode

132‧‧‧ point spacers

134‧‧‧insulation frame

136‧‧‧Transparent protective layer

142‧‧‧First alignment layer

144‧‧‧Upper electrode

146‧‧‧ public base

148‧‧‧First polarizer

152‧‧‧Second alignment layer

154‧‧‧Thin-film transistor panel

158‧‧‧Second polarizer

160‧‧‧Liquid layer

Claims (15)

A touch-type liquid crystal display, comprising: a liquid crystal display and a resistive touch screen, wherein the resistive touch screen comprises: a first electrode plate, the first electrode plate comprises a first substrate and a first a transparent conductive layer; and a second electrode plate, the second electrode plate includes a common substrate, a second transparent conductive layer, and a plurality of third electrodes, the first transparent conductive layer and the second transparent conductive layer are opposite to each other, Wherein the second transparent conductive layer is a carbon nanotube layer, the carbon nanotubes in the carbon nanotube layer extend substantially in a second direction, and the plurality of third electrodes are respectively perpendicular to the second direction The first direction is spaced apart from one side of the second transparent conductive layer and electrically connected to the second transparent conductive layer; the liquid crystal display comprises, in order from top to bottom, a first polarizer; an upper substrate An upper electrode; a first alignment layer; a liquid crystal layer; a second alignment layer; a thin film transistor panel; and a second polarizer, wherein the upper substrate is a common substrate of the resistive touch screen. A first polarizer disposed between the second transparent conductive layer and the common substrate. The touch liquid crystal display of claim 1, wherein the carbon nanotube layer has a resistivity in a direction in which the carbon nanotubes extend is smaller than a resistivity in the other direction. The touch liquid crystal display of claim 2, wherein each of the carbon nanotubes in the carbon nanotube layer extends substantially in a second direction and extends in each of the carbon nanotubes The upwardly adjacent carbon nanotubes are connected end to end by van der Waals force. The touch liquid crystal display of claim 3, wherein the carbon nanotube layer is a self-supporting film formed by at least one of the first substrate and the common substrate by direct laying. The surface of the substrate. The touch liquid crystal display of claim 1, wherein the carbon nanotube layer is formed with a plurality of laser cutting lines parallel to a direction in which the carbon nanotubes extend. The touch liquid crystal display of claim 1, wherein the carbon nanotube layer is disposed on a surface of the first polarizer by a van der Waals force. The touch liquid crystal display of claim 1, wherein the carbon nanotube layer is disposed on a surface of the first polarizer by a transparent optical glue or UV glue. The touch liquid crystal display of claim 1, wherein the first electrode plate further comprises a first electrode, the first electrode is continuously disposed around the first transparent conductive layer, and the first transparent The second electrode plate further includes a second electrode, and the plurality of third electrodes and the second electrode are respectively disposed on the two sides of the second transparent conductive layer parallel to the first direction And electrically connected to the second transparent conductive layer. The touch liquid crystal display of claim 1, wherein the first electrode plate further comprises a first electrode, the first electrode is continuously disposed around the first transparent conductive layer, and the first transparent The conductive layer is electrically connected; the second electrode plate further includes a plurality of second electrodes, wherein the plurality of second electrodes and the plurality of third electrodes are respectively disposed on the second transparent conductive layer parallel to the first direction Both sides are electrically connected to the second transparent conductive layer. The touch liquid crystal display of claim 1, wherein the first transparent conductive layer is the carbon nanotube layer, and the carbon nanotubes in the carbon nanotube layer are preferentially oriented in the first direction The orientation extends. The touch liquid crystal display of claim 10, wherein the first electrode plate further comprises a first electrode and a plurality of fourth electrodes, and the plurality of fourth electrodes and the first electrode are respectively disposed on the first electrode a transparent conductive layer parallel to both sides of the second direction and electrically connected to the first transparent conductive layer; the second electrode plate further includes a second electrode, the plurality of third electrodes and the second electrode And respectively disposed on the two sides of the second transparent conductive layer parallel to the first direction, and electrically connected to the second transparent conductive layer. The touch liquid crystal display of claim 10, wherein the first electrode plate further comprises a plurality of first electrodes and a plurality of fourth electrodes, wherein the plurality of first electrodes and the plurality of fourth electrodes are respectively disposed on The first transparent conductive layer is parallel to the two sides of the second direction and is electrically connected to the first transparent conductive layer; the second electrode plate further includes a plurality of second electrodes, and the plurality of second electrodes and The plurality of third electrodes are respectively disposed on the two sides of the second transparent conductive layer parallel to the first direction, and are electrically connected to the second transparent conductive layer. The touch liquid crystal display of claim 1, wherein a polarization direction of the first polarizer is perpendicular or parallel to a polarization direction of the second polarizer. The touch liquid crystal display of claim 1, wherein the materials of the first polarizer and the second polarizer are dichroic organic polymer materials. The touch liquid crystal display according to claim 1, wherein a ratio of a resistivity of the carbon nanotube layer in one direction to a resistivity in any other direction is 1/2 or less.