TWI481923B - Liquid crystal display with touch panel - Google Patents

Description

Touch liquid crystal display

The present invention relates to a liquid crystal display, and more particularly 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 diversification of various electronic devices such as mobile phones, touch navigation systems, integrated computer monitors, and interactive televisions, electronic devices that mount translucent touch screens on the display surface of liquid crystal displays have gradually increased. . The user of the electronic device visually confirms the display content of the liquid crystal display located on the back surface of the touch screen through the touch screen, and presses the touch panel to operate by a finger or a pen. Thereby, various functions of the electronic device using the liquid crystal display can be operated.

However, the liquid crystal display using the capacitive touch screen includes a capacitive touch screen, a first polarizer, a second substrate, a first alignment layer, a liquid crystal layer, a second alignment layer, and a thin film transistor template. And a second polarizer. The capacitive touch screen may be a single-point or multi-point type. For example, a multi-point capacitive touch screen commonly used as a projected capacitive touch screen generally includes a first substrate and a first indium tin oxide (Indium Tin Oxide) from the outside to the inside. , an ITO layer (hereinafter referred to as an ITO layer), a second substrate, and a second ITO layer, the second ITO layer being disposed in contact with the first polarizer. It can be seen that integrating the touch screen into the liquid crystal display inevitably increases the thickness of the liquid crystal display, and the structure is relatively complicated, which is disadvantageous for the liquid crystal display and the application of the liquid crystal display. The development of miniaturization and thinning of sub-devices.

In view of this, it is necessary to provide a touch type liquid crystal panel having a simple structure and a thin thickness.

The touch-type liquid crystal display includes a capacitive touch screen including a first substrate and a transparent conductive layer, and the transparent conductive layer is disposed on the upper surface of the first substrate, the transparent conductive layer. Is a conductive anisotropic layer, the conductive anisotropic layer is a carbon nanotube layer, the carbon nanotube layer comprises a plurality of carbon nanotubes, and the carbon nanotubes in the carbon nanotube layer are along the same An upper substrate, the upper substrate includes a first polarizer, an upper substrate, an upper electrode and a first alignment layer in order from top to bottom, wherein the first polarizer is the a carbon nanotube layer, the upper substrate is the first substrate; a liquid crystal layer; and a lower substrate, the lower substrate includes a second alignment layer, a thin film transistor panel and a second polarizer in order from top to bottom .

The touch-type liquid crystal display comprises, in order from top to bottom, a capacitive touch screen comprising, in order from top to bottom, a second transparent conductive layer, a second substrate, a first transparent conductive layer and a first a substrate; the upper substrate includes a first polarizer, an upper substrate, an upper electrode, and a first alignment layer; a liquid crystal layer; and a lower substrate from top to bottom Including a second alignment layer, a thin film transistor panel, and a second polarizer; wherein one of the first transparent conductive layer and the second transparent conductive layer is a conductive anisotropic layer, the conductive The anisotropic layer is a carbon nanotube layer, the carbon nanotube layer comprises a plurality of carbon nanotubes, and the carbon nanotubes in the carbon nanotube layer extend in a preferred orientation in the same direction, and the other transparent conductive layer The layer includes a plurality of electrically conductive structures spaced apart The first polarizer is the carbon nanotube layer, and the upper substrate is the first substrate.

Compared with the prior art, the touch liquid crystal display provided by the present invention uses a carbon nanotube layer not only as a transparent conductive layer of the touch screen, but also as a first polarizer of the touch liquid crystal display, the first of the capacitive touch screens. The substrate doubles as the upper substrate of the upper substrate, so that the touch liquid crystal display has a simple structure and a thin thickness, which simplifies the manufacturing process and reduces the manufacturing cost.

10;20‧‧‧Touch LCD

110; 210‧‧‧ touch screen

112; 211‧‧‧ first substrate

114‧‧‧Transparent conductive layer

115; 216‧‧‧ first electrode

116;218‧‧‧second electrode

118; 215‧‧ ‧ transparent protective layer

120; 220‧‧‧Upper substrate

122; 222‧‧‧ first alignment layer

124; 224‧‧‧ upper electrode

130; 230‧‧‧ lower substrate

132; 232‧‧‧ second alignment layer

134; 234‧‧‧film transistor panel

136;236‧‧‧second polarizer

140; 240‧‧‧ liquid crystal layer

212‧‧‧First transparent conductive layer

213‧‧‧Second substrate

214‧‧‧Second transparent conductive layer

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

2 is a top plan view of the touch screen of FIG. 1.

3 is a scanning electron micrograph of a carbon nanotube film taken by the transparent conductive layer in FIG.

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 top plan view of the touch screen of FIG. 4. FIG.

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 liquid crystal display 10 includes a touch screen 110, an upper substrate 120, a lower substrate 130, and a liquid crystal layer 140. The touch screen 110 is disposed on the upper surface of the upper substrate 120; the lower substrate 130 is disposed opposite to the upper substrate 120; the liquid crystal layer 140 is disposed between the upper substrate 120 and the lower substrate 130 . In this In the specification, "upper" and "lower" refer only to the relative orientation, "upper" refers to the direction of the touch surface near the touch liquid crystal display, and "lower" refers to the direction away from the touch surface of the touch liquid crystal display.

Referring to FIG. 2 , the touch screen 110 is a surface capacitive touch screen. The touch screen 110 includes a first substrate 112 , a transparent conductive layer 114 , two first electrodes 115 , two second electrodes 116 , and a transparent surface . Protective layer 118. The transparent conductive layer 114 is disposed on the upper surface of the first substrate 112; the two first electrodes 115 and the two second electrodes 116 are electrically connected to the transparent conductive layer 114; the transparent protective layer 118 may be directly disposed on the upper surface of the transparent conductive layer 114 for protecting the transparent conductive layer 114.

The upper substrate 120 includes a transparent conductive layer 114, a first substrate 112, an upper electrode 124 and a first alignment layer 122 in order from top to bottom. The upper electrode 124 is disposed on a lower surface of the first substrate 112. The first alignment layer 122 is disposed on a lower surface of the upper electrode 124 and disposed adjacent to the liquid crystal layer 140. Further, the lower surface of the first alignment layer 122 may include a plurality of parallel first trenches for aligning the liquid crystal molecules of the liquid crystal layer 140.

The transparent conductive layer 114 in the touch screen 110 also serves as the first polarizer of the upper substrate 120. The first substrate 112 serves as both a base of the touch screen 110 and an upper base of the upper substrate 120. Therefore, the touch liquid crystal display 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.

The liquid crystal layer 140 includes a plurality of long rod-shaped liquid crystal molecules. The liquid crystal material of the liquid crystal layer 140 is a liquid crystal material commonly used in the prior art. The thickness of the liquid crystal layer 140 is 1 to 50 micrometers. In the embodiment, the thickness of the liquid crystal layer 140 is 5 micrometers.

The lower substrate 130 includes a second alignment layer 132, a thin film transistor panel 134 and a second polarizer 136 in this order from top to bottom. The second alignment layer 132 is disposed on an upper surface of the thin film transistor panel 134, disposed adjacent to the liquid crystal layer 140. Further, the upper surface of the second alignment layer 132 may include a plurality of parallel second trenches arranged in a direction perpendicular to the direction in which the first trenches of the first alignment layer 122 are arranged. The second polarizer 136 is disposed on a lower surface of the thin film transistor panel 134.

It will be appreciated that additional layers may optionally be interposed between the various layers as desired for various functions.

The first substrate 112 is a transparent film or sheet. The material of the first substrate 112 may be a hard material such as glass, quartz or diamond. The first substrate 112 serves primarily as a support. When used in a flexible touch screen, the material of the first substrate 112 may also be a flexible material such as plastic or resin. Specifically, the material used for the first substrate 112 may be a polyester material such as polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), or polyether. Materials such as bismuth (PES), cellulose ester, polyvinyl chloride (PVC), benzocyclobutene (BCB) or acrylic resin. The first substrate 112 has a thickness of 1 mm to 1 cm. In this embodiment, the first substrate 112 is made of glass and has a thickness of 5 mm. 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 have a good transparency and serve as a support.

The transparent conductive layer 114 in the touch screen 110 is a carbon nanotube layer. The carbon nanotube layer is a resistive anisotropic 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 resistance of the carbon nanotube layer in one direction is smaller than the resistance of the other direction. Most of the carbon nanotubes in the carbon nanotube layer extend substantially parallel to the surface of the carbon nanotube layer and are in the nanocarbon The resistivity in the direction in which the tube extends is smaller than the resistivity in the other direction. Preferably, the ratio of the resistivity of the carbon nanotube layer in the direction in which the carbon nanotube extends is different from the resistivity in the other direction is less than or equal to 1:2. That is, the conductivity of the carbon nanotube layer in the direction in which the carbon nanotubes extend is more than twice that of the other directions. The carbon nanotube layer includes at least one carbon nanotube film. Wherein, when the carbon nanotube layer comprises a plurality of carbon nanotube film, the carbon nanotube film is laminated or arranged in parallel without gaps, and the plurality of carbon nanotube films are large Most of the carbon nanotubes are arranged in the same direction in the same direction, that is, the arrangement direction of the carbon nanotubes in the adjacent carbon nanotube film is substantially the same. In this embodiment, the carbon nanotube layer is a carbon nanotube film, that is, the transparent conductive layer 114 is composed of a carbon nanotube film. 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.

Referring to FIG. 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. The preferred orientation means that the overall extension direction of most of the carbon nanotubes in the carbon nanotube film is substantially 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 self-supporting carbon nanotube film does not require a large-area carrier support, and as long as the support force is provided on both sides, it can be suspended in the whole to maintain its own film state, that is, the carbon nanotube film is placed (or Fixed at two distances set at a distance On the body, the carbon nanotube film located between the two supports can be suspended to maintain its own film state. The self-supporting is mainly achieved by the presence of continuous carbon nanotubes extending through the end-to-end extension of the van der Waals force in the carbon nanotube film.

Specifically, the plurality of carbon nanotubes extending substantially in the same direction in the carbon nanotube film are not absolutely linear and may be appropriately bent; or are not completely aligned in the extending direction, and may 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.

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 specific method for extracting the carbon nanotube film from the carbon nanotube array comprises: (a) selecting a carbon nanotube segment from the carbon nanotube array, and the embodiment preferably adopts a tape or viscous strip of a certain width contacting the array of carbon nanotubes to select a carbon nanotube segment having a width; (b) pulling the selected nanocarbon at a certain speed by moving the stretching tool The tube segments, thereby connecting the plurality of carbon nanotube segments end to end, form a continuous carbon nanotube film. The plurality of carbon nanotubes are arranged side by side such that the carbon nanotube segments have a certain width. When the selected carbon nanotube segment is gradually separated from the growth substrate of the carbon nanotube array in the pulling direction under the pulling force, adjacent to the selected carbon nanotube segment due to the effect of van der Waals force Other carbon nanotube segments are successively pulled out end to end, thereby A continuous, uniform carbon nanotube film having a certain width and a preferred orientation is formed.

The carbon nanotube film has a minimum electrical resistance in the stretching direction and a maximum electrical resistance in a direction perpendicular to the stretching direction, and thus has an electrical anisotropy, that is, an anisotropic conductivity.

For the structure of the carbon nanotube film, please refer to the Taiwan invention patent application publication disclosed in the publication No. TW 200833862. Since the carbon nanotube in the carbon nanotube film has good flexibility, the carbon nanotube film has good flexibility and can be bent and folded into any shape without being easily broken; The carbon nanotube layer also has better flexibility, so that the touch screen 110 using the carbon nanotube layer as a transparent conductive layer has better durability, and thus the touch liquid crystal display 10 using the touch screen 110 has a comparative advantage. Good durability.

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.

Additionally, the carbon nanotube layer may further include a reinforcing material uniformly distributed in the plurality of carbon nanotubes to form a carbon nanotube composite layer. Specifically, the carbon nanotube composite layer includes at least one carbon nanotube film and the reinforcing material, and the reinforcing material is uniformly distributed in a gap between the carbon nanotubes in the at least one carbon nanotube film in. Wherein, the reinforcing material may be a polymer material or a metal material. The polymer material is a transparent polymer material, and the specific material thereof is not limited, and may be polystyrene, polyethylene, polycarbonate, polymethyl methacrylate (PMMA), polycarbonate (PC), and benzene. Ethylene glycol dicarboxylate (PET), phenylcyclobutene (BCB) or polycycloolefin. The metal material is a metal material such as nickel, gold, platinum, iron, cobalt or copper.

It will be appreciated that the carbon nanotube layer may also 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.

Since the transparent conductive layer 114 is a carbon nanotube layer, the absorption of electromagnetic waves by the carbon nanotubes in the carbon nanotube layer is close to an absolute black body, and the carbon nanotubes have uniform absorption characteristics for electromagnetic waves of various wavelengths. Therefore, the transparent conductive layer 114 also has uniform polarization absorption performance for electromagnetic waves of various wavelengths. Moreover, since the carbon nanotubes in the transparent conductive layer 114 are arranged substantially in the same direction, when the light wave is incident, the light whose direction of vibration is parallel to the length of the carbon nanotube is absorbed, and the light perpendicular to the length of the carbon nanotube It is transparent, so the transmitted light becomes linearly polarized light. Therefore, the transparent conductive layer 114 not only has the function of conducting electricity, but also has the polarizing effect of the polarizer, and can be used as the first polarizer. The upper substrate 120 does not need to additionally add a polarizer, so that the touch liquid crystal display 10 has a thin thickness. The structure and manufacturing cost of the touch liquid crystal display 10 are simplified, and the utilization ratio of the backlight is improved, and the display quality is improved.

In the touch screen 110, the two first electrodes 115 are spaced apart from both ends of the transparent conductive layer 114 in the first direction or both ends of the first substrate 112 in the first direction, and the transparent conductive layer. 114 electrically connected, the first direction is the X direction shown in FIG. 2, the first direction is substantially parallel to the extending direction of the majority of the carbon nanotubes; the two second electrodes 116 are spaced apart at the The transparent conductive layer 114 is electrically connected to the transparent conductive layer 114 at both ends in the second direction or both ends of the first substrate 112 in the second direction, that is, the Y direction shown in FIG. Wherein, the first direction and the second direction are only required to intersect; preferably, the first direction is perpendicular to the second direction.

Specifically, the first electrode 115 and the second electrode 116 may be disposed on the transparent conductive The same surface of the layer 114 may be disposed on different surfaces of the transparent conductive layer 114 as long as it is electrically connected to the transparent conductive layer 114, and a uniform resistor network may be formed on the transparent conductive layer 114. The materials of the two first electrodes 115 and the two second electrodes 116 are metal, carbon nanotubes or other conductive materials, as long as the two first electrodes 115 and the two second electrodes 116 are electrically conductive. In this embodiment, the two first electrodes 115 are spaced apart from each other at opposite ends of the transparent conductive layer 114 in the X direction, and the two second electrodes 116 are spaced apart from the transparent conductive layer 114 in the Y direction. Both ends; and the X direction is orthogonal to the Y direction. The first electrode 115 and the second electrode 116 are both strip-shaped silver layers.

In the touch screen 110, the transparent protective layer 118 is disposed on the upper surface of the transparent conductive layer 114, and covers the two first electrodes 115 and the two second electrodes 116 at the same time. The transparent protective layer 118 may be formed of a material such as tantalum nitride, hafnium oxide, phenylcyclobutene (BCB), a polyester film, or an acrylic resin. The transparent protective layer 118 can also be a plastic layer with a hardened surface and a smooth scratch-resistant layer for protecting the transparent conductive layer 114 and improving durability. The transparent protective layer 118 can also be used to provide additional functionality such as reducing glare or reducing reflections. In this embodiment, the transparent protective layer 118 is made of polyethylene terephthalate (PET).

In the upper substrate 120, the material of the upper electrode 124 may be a transparent conductive material such as ITO, and the upper electrode 124 functions to apply an alignment voltage to the liquid crystal layer 140.

The material of the first alignment layer 122 of the upper substrate 120 may be polystyrene and its derivatives, polyimine, polyvinyl alcohol, polyester, epoxy resin, polyurethane, polydecane, and the like. The first trench of the first alignment layer 122 may be formed by a rubbing method, a tilt evaporation SiOx film method, and a micro trench treatment method for the film, and the first trench may align the liquid crystal molecules. In this embodiment, the material of the first alignment layer 122 is Polyimine with a thickness of 1 to 50 microns.

In the lower substrate 130, the second alignment layer 132 is the same material as the first alignment layer 122, and the second trench of the second alignment layer 132 may align the liquid crystal molecules. Since the first trench of the first alignment layer 122 and the second trench of the second alignment layer 132 are perpendicular to each other, the liquid crystal molecules between the first alignment layer 122 and the second alignment layer 132 are in the two The alignment angle between the alignment layers produces a 90-degree rotation, thereby functioning as an optical rotation, and the polarization direction of the polarized light of the second polarizer 136 is rotated by 90 degrees. In this embodiment, the second alignment layer 132 is made of polyimide and has a thickness of 1 to 50 micrometers.

The thin film transistor panel 134 further includes a third substrate, a plurality of thin film transistors formed on the upper surface of the third substrate, 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.

The material of the second polarizer 136 is a polarizing material commonly used in the prior art, such as a dichroic organic polymer material, and specifically may be an iodine-based material or a dye material. The material of the second polarizer 136 may also be the carbon nanotube film. The second polarizer 136 has a thickness of 1 micrometer to 0.5 millimeter. The second polarizer 136 functions 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 136 and the polarization direction of the transparent conductive layer 114 may be perpendicular or parallel, that is, the polarization direction of the second polarizer 136 may be perpendicular to the polarization direction of the carbon nanotube layer. Can also be parallel. In this embodiment, the second polarizer 136 The material is a carbon nanotube film. The polarization direction of the second polarizer 136 is perpendicular to the polarization direction of the transparent conductive layer 114, that is, the direction in which the majority of the carbon nanotubes in the transparent conductive layer 114 are preferentially aligned and the second polarizer 136 Most of the carbon nanotubes are oriented in a preferred orientation with a vertical orientation.

Referring to FIG. 4, a second embodiment of the present invention provides a touch-type liquid crystal display 20, which includes: a touch screen 210; an upper substrate 220, the capacitive touch screen 210 is disposed on the upper substrate 220; The substrate 230 is disposed opposite to the upper substrate 220; and a liquid crystal layer 240 is disposed between the upper substrate 220 and the lower substrate 230. The upper substrate 220 is a first polarizer, an upper substrate, an upper electrode 224 and a first alignment layer 222 from top to bottom; the lower substrate 230 includes a second alignment from top to bottom. The layer 232, a thin film transistor panel 234 and a second polarizer 236.

The touch liquid crystal display 20 provided by the second embodiment is substantially the same as the touch liquid crystal display 10 provided in the first embodiment, except that the touch screen 210 in this embodiment is a projected capacitive touch screen. Referring to FIG. 5 , the touch screen 210 includes a first substrate 211 , a first transparent conductive layer 212 , a second substrate 213 , a second transparent conductive layer 214 , a transparent protective layer 215 , and a plurality of first electrodes. 216 and a plurality of second electrodes 218. The first transparent conductive layer 212 is disposed on the upper surface of the first substrate 211 , and the second substrate 213 is disposed between the first transparent conductive layer 212 and the second transparent conductive layer 214 . The transparent protective layer 215 is disposed on an upper surface of the second transparent conductive layer 214. The plurality of first electrodes 216 are spaced apart from each other along a side of the first transparent conductive layer 212 parallel to the X direction along a first direction, such as an X direction, and are respectively electrically connected to the first transparent conductive layer 212. Connecting; the plurality of second electrodes 218 are spaced apart from each other along a second direction such as the Y direction The second transparent conductive layer 214 is disposed on one side parallel to the Y direction, and is electrically connected to the second transparent conductive layer 214, respectively.

The first base 211 and the second base 213 are both insulating materials and are the same as the first base 112 in the first embodiment. The first substrate 211 is also the upper substrate of the upper substrate 220. Therefore, the touch liquid crystal display 20 has a thin thickness and a simple structure, simplifies the manufacturing process, reduces the manufacturing cost, and improves the height. The utilization of the backlight improves the display quality.

The first transparent conductive layer 212 is disposed on a lower surface of the second substrate 213. The first transparent conductive layer 212 is the carbon nanotube layer, and includes a plurality of carbon nanotubes, and the plurality of carbon nanotubes extend in a preferred orientation in the same direction. The material of the first transparent conductive layer 212 is the same as that of the transparent conductive layer 114 in the first embodiment. Therefore, the first transparent conductive layer 212 also serves as the first polarizer of the upper substrate 220. The carbon nanotube layer includes at least one of the carbon nanotube film, the at least one carbon nanotube film has a minimum electrical resistance in a tensile direction thereof and a maximum electrical resistance in a direction perpendicular to the stretching direction, Therefore, it has electrical anisotropy, that is, conductive anisotropy. Wherein the second direction in the first transparent conductive layer 212 is the overall axial extension direction of most of the carbon nanotubes in the carbon nanotube layer as shown in FIG. 5, and the nanocarbon is also The carbon nanotubes in the tube layer are connected end to end in the Y direction in a direction in which the preferred orientation is arranged. The resistivity of the first transparent conductive layer 212 in the Y direction is smaller than that in other directions, and the resistivity perpendicular to the Y direction is the largest. The first direction of the first transparent conductive layer is the X direction in FIG. 5, which is parallel to the surface of the carbon nanotube layer and intersects the Y direction. In this embodiment, the X direction is perpendicular to the Y direction, and the resistivity of the first transparent conductive layer 212 in the Y direction is smaller than its resistivity in the X direction.

Since the carbon nanotube layer in the first transparent conductive layer 212 has a good orientation in the Y direction The first transparent conductive layer 212 can be regarded as forming a plurality of mutually spaced and parallel to the Y direction when the plurality of first electrodes 216 are spaced apart from each other in the X direction on the side of the first transparent conductive layer 212. The conductive strips are electrically connected to the plurality of first electrodes 216 respectively. The material of the plurality of first electrodes 216 is a conductor such as a metal.

Further, the carbon nanotube layer in the first transparent conductive layer 212 may further form a plurality of laser cutting lines by etching or laser processing, and the plurality of laser cutting lines extend in the Y direction to increase the nano carbon. Conductive anisotropy of the tube layer.

The second transparent conductive layer 214 is disposed on an upper surface of the second substrate 213. The second transparent conductive layer 214 has a plurality of patterned spaced apart conductive structures, such as elongated conductive structures, which are substantially parallel to each other and spaced apart by a predetermined distance. The plurality of conductive structures extend along the X direction and are spaced apart along the Y direction of the second transparent conductive layer 214. Generally, the conductive direction of the conductive structure of the second transparent conductive layer 214 is perpendicular to the direction of the minimum resistivity of the first transparent conductive layer 212. In this embodiment, the second transparent conductive layer 214 is a patterned ITO film, and includes a plurality of elongated conductive structures. The conductive directions of the plurality of elongated conductive structures are perpendicular to the first transparent conductive layer 212. The direction in which most of the carbon nanotubes extend.

It can be understood that the material of the second transparent conductive layer 214 may also be a transparent conductive material such as a carbon nanotube. That is, the second transparent conductive layer 214 may be a carbon nanotube film composed of uniformly distributed carbon nanotubes, and the carbon nanotubes are tightly coupled by van der Waals force. The carbon nanotubes in the carbon nanotube film are disordered or ordered. The so-called disordered arrangement means that the arrangement direction of the carbon nanotubes is irregular. The so-called ordered arrangement means that the arrangement direction of the carbon nanotubes is regular. Specifically, when the carbon nanotube film includes a disordered arrangement of carbon nanotubes, the carbon nanotubes are intertwined or the carbon nanotube membranes are oriented Same as the same; when the carbon nanotube film comprises an ordered arrangement of carbon nanotubes, most of the carbon nanotubes in the carbon nanotube film are arranged in a preferred orientation in one direction or in a plurality of directions.

The plurality of second electrodes 218 are arranged on the side of the second transparent conductive layer 214 at intervals in the second direction, and are electrically connected to the plurality of conductive structures of the second transparent conductive layer 214, respectively. Each second electrode 218 extends in a first direction. The material of the plurality of second electrodes 218 is the same as the material of the plurality of first electrodes 216.

The first transparent conductive layer 212 and the second transparent conductive layer 214 are separated by the second substrate 213, and the plurality of conductive strips of the first transparent conductive layer 212 and the second transparent conductive layer 214 are plural. A plurality of capacitors are formed at a plurality of intersection positions at which the conductive structures intersect each other. The plurality of capacitors can be measured by an external circuit electrically coupled to the first electrode 216 and the second electrode 218. When a touch object such as a finger approaches one or more intersection positions, the capacitance of the intersection position changes, and the external circuit detects the changed capacitance, thereby obtaining a coordinate of the touch position.

The material and function of the transparent protective layer 215 are the same as those of the transparent protective layer 118 in the touch screen 110 in the first embodiment.

It can be understood that the materials and structures of the first transparent conductive layer 212 and the second transparent conductive layer 214 are interchangeable. For example, the first transparent conductive layer 212 may be a transparent conductive material such as ITO or a carbon nanotube film, and has a plurality of conductive structures; the second transparent conductive layer 214 is the carbon nanotube layer, and the nanometer The carbon tube layer has an electrically conductive anisotropy.

The touch liquid crystal display provided by the embodiment of the invention has the following advantages: First, the transparent conductive layer near the upper substrate provided by the implementation of the invention is a carbon nanotube layer, and the carbon nanotube layer is not only transparent as a touch screen Conductive layer, and double as the touch The first polarizer of the liquid crystal display, the first substrate in the capacitive touch screen provided by the embodiment of the invention also serves as the base of the upper substrate, which saves a substrate and a polarizer compared to the previous touch liquid crystal display, so that it has a thinner The thickness and simple structure simplify the manufacturing process, reduce manufacturing costs, improve backlight utilization, and improve display quality. Secondly, since the carbon nanotube layer has good toughness and mechanical strength, the use of the carbon nanotube layer as a transparent conductive layer can correspondingly improve the durability of the touch screen, thereby improving the use of the carbon nanotube layer. Durability of touch-screen LCDs. Third, since the carbon nanotubes are aligned in the carbon nanotube layer, the above-mentioned carbon nanotube layer is used as the transparent conductive layer, so that the transparent conductive layer has a uniform resistance distribution, thereby improving The resolution and accuracy of the touch screen and the display device using the touch screen. In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by 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

110‧‧‧ touch screen

112‧‧‧First substrate

114‧‧‧Transparent conductive layer

115‧‧‧First electrode

116‧‧‧Second electrode

118‧‧‧Transparent protective layer

120‧‧‧Upper substrate

122‧‧‧First alignment layer

124‧‧‧Upper electrode

130‧‧‧lower substrate

132‧‧‧Second alignment layer

134‧‧‧film transistor panel

136‧‧‧Second polarizer

140‧‧‧Liquid layer

Claims (12)

A touch-type liquid crystal display is improved in that the touch-type liquid crystal display comprises, in order from top to bottom, a capacitive touch screen, the capacitive touch screen comprising a first substrate and a transparent conductive layer, wherein the transparent conductive layer is disposed on the first An upper surface of the substrate, the transparent conductive layer is a conductive anisotropic layer, the conductive anisotropic layer is a carbon nanotube layer, the carbon nanotube layer comprises a plurality of carbon nanotubes, and the nanocarbon The carbon nanotubes in the tube layer extend in a preferred orientation in the same direction, the carbon nanotube layer having a plurality of laser cutting lines along the extending direction of the carbon nanotube; an upper substrate, the upper substrate from the top to the top The lower polarizer includes a first polarizer, an upper substrate, an upper electrode, and a first alignment layer, wherein the first polarizer is a carbon nanotube layer of the capacitive touch screen, and the upper substrate is The first substrate of the capacitive touch screen; a liquid crystal layer; and a lower substrate, the lower substrate includes a second alignment layer, a thin film transistor panel and a second polarizer in order from top to bottom. The touch liquid crystal display of claim 1, wherein each of the plurality of carbon nanotubes extending substantially in the same direction in the carbon nanotube layer is adjacent to the extending direction The carbon nanotubes are connected end to end by van der Waals force. The touch liquid crystal display according to 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 3, wherein a ratio of a resistivity of the carbon nanotube layer in a direction in which the carbon nanotube extends is different from a resistivity in other directions is less than or equal to 1:2. The touch liquid crystal display of claim 1, wherein the carbon nanotube layer further comprises a reinforcing material uniformly distributed in the plurality of carbon nanotubes. The touch liquid crystal display of claim 1, wherein the capacitive touch screen further comprises at least two electrodes that are spaced apart and electrically connected to the transparent conductive layer. A touch-type liquid crystal display includes a capacitive touch screen in order from top to bottom: a second transparent conductive layer, a second substrate, a first transparent conductive layer, and a first a first substrate; an upper substrate, the upper substrate includes a first polarizer, an upper substrate, an upper electrode, and a first alignment layer; a liquid crystal layer; and a lower substrate from the top to the bottom The second alignment layer includes a second alignment layer, a thin film transistor panel and a second polarizer; the improvement is that one of the first transparent conductive layer and the second transparent conductive layer is conductive anisotropy a layer, the conductive anisotropic layer is a carbon nanotube layer, the carbon nanotube layer comprises a plurality of carbon nanotubes, and the carbon nanotubes in the carbon nanotube layer are preferentially oriented in a second direction The carbon nanotube layer has a plurality of laser cutting lines extending in a second direction, and the other transparent conductive layer includes a plurality of conductive structures extending in a first direction and spaced apart from each other. Description A carbon nanotube layer polarizer of the capacitive touch screen, the upper substrate is a first substrate of the capacitive touch screen. The touch liquid crystal display of claim 7, wherein each of the plurality of carbon nanotubes extending substantially in the second direction in the carbon nanotube layer is adjacent to the extending direction The carbon nanotubes are connected end to end by van der Waals force. The touch liquid crystal display of claim 7, wherein the carbon nanotube layer further comprises a reinforcing material uniformly distributed in the plurality of carbon nanotubes. The touch liquid crystal display of claim 7, wherein the first transparent conductive layer is the carbon nanotube layer, and the carbon nanotubes in the carbon nanotube layer extend in a preferred orientation in a second direction. And The resistivity of the carbon nanotube layer in the second direction is smaller than the resistivity of the carbon nanotube layer in other directions; the second transparent conductive layer comprises a plurality of conductive structures, the plurality of conductive structures along the first The directions extend and are arranged at intervals in the second direction; wherein the first direction is perpendicular to the second direction. The touch liquid crystal display of claim 10, wherein the capacitive touch screen further comprises a plurality of first electrodes and a plurality of second electrodes, wherein the plurality of first electrodes are disposed on the first transparent conductive layer in parallel One side of the first direction, and the first transparent conductive layer is arranged along the first direction and electrically connected to the first transparent conductive layer; the plurality of second electrodes are disposed on the second transparent The conductive layer is parallel to one side of the second direction, and is disposed at intervals along the second direction on the second transparent conductive layer, and is electrically connected to the plurality of conductive structures respectively. The touch liquid crystal display of claim 11, wherein the conductive structure is made of indium tin oxide or a carbon nanotube.