CN107783341B - Preparation method of transparent conductive substrate for liquid crystal display screen - Google Patents
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
- G02F1/133788—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by light irradiation, e.g. linearly polarised light photo-polymerisation
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Polarising Elements (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The invention provides a preparation method of a transparent conductive substrate for a liquid crystal display screen, and relates to the technical field of liquid crystal display. The preparation method comprises providing a transparent substrate, and uniformly coating an adhesive layer. And laying a carbon nano tube layer on the surface of the adhesive layer, wherein the carbon nano tube layer comprises a plurality of carbon nano tubes with the same extension direction, curing the adhesive layer, and adhering the carbon nano tube layer on the surface of the transparent substrate. And forming an insulating isolation layer on the surface of the carbon nanotube layer far away from the adhesive layer. Coating a photo-alignment substrate layer on the surface of the isolation layer, wherein the photo-alignment substrate layer is mixed with a polarization material; and curing the photo-alignment substrate layer so that the molecular arrangement direction of the polarizing material is the same as the extending direction of the carbon nanotubes. The polarized material separation in carbon nanotube layer and the optical alignment substrate prevents carbon nanotube layer from to polarized material's harmful effects after the on-current, guarantees the stability of product, increase of service life.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a preparation method of a transparent conductive substrate for a liquid crystal display screen.
Background
The liquid crystal display has the advantages of being ultrathin, capable of displaying on a large-size screen, low in power consumption, free of radiation, high in resolution and the like, is one of mainstream displays at present, is widely applied to various electronic products, and is an essential tool for daily life and work of people. The existing liquid crystal display comprises a TFT array substrate, a color film substrate and a liquid crystal layer arranged between the TFE array substrate and the color film substrate, which are arranged oppositely. CN104932149A discloses a liquid crystal display, a composite substrate and a manufacturing method thereof, in which a carbon nanotube layer is bonded on the surface of a substrate by a photo-alignment substrate to form the composite substrate, and the composite substrate can be used as an alignment layer and a polarization layer, and has a simple structure.
The inventors have found that when the composite substrate is used as a material for a liquid crystal display device or the like, it is necessary to input a common voltage to the carbon nanotube layer and use the carbon nanotube layer as a common electrode layer. When the carbon nanotube layer is electrified, the polarization material on the carbon nanotube layer is also subjected to the current. Polarizing materials, particularly dichroic organic dyes, are susceptible to electrolytic separation or degradation and loss of polarizing properties when energized or de-energized for a long period of time.
Disclosure of Invention
The invention aims to provide a preparation method of a transparent conductive substrate for a liquid crystal display screen, which effectively separates a carbon nanotube layer from a photo-alignment substrate layer, ensures that a polarization material is not influenced by power-on and power-off, and prolongs the service life.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The invention provides a preparation method of a transparent conductive substrate for a liquid crystal display screen, which comprises the following steps:
s1, providing a transparent substrate;
s2, uniformly coating an adhesive layer on the transparent substrate;
s3, laying a carbon nano tube layer on the surface of the adhesive layer, wherein the carbon nano tube layer comprises a plurality of carbon nano tubes with the same extending direction;
s4, curing the adhesive layer, and adhering the carbon nanotube layer on the surface of the transparent substrate;
s5, forming an insulating isolation layer on the surface of the carbon nanotube layer far away from the adhesive layer;
s6, coating a photo-alignment substrate layer on the surface of the isolation layer, wherein the photo-alignment substrate layer is mixed with a polarization material; and
and S7, curing the photo-alignment substrate layer to ensure that the molecular arrangement direction of the polarization material is the same as the extending direction of the carbon nano tubes.
The preparation method of the transparent conductive substrate has the beneficial effects that:
firstly, the carbon nano tube is bonded on the surface of the transparent substrate by using a bonding agent to form a carbon nano tube layer. The extending directions of a plurality of carbon nano tubes in the carbon nano tube layer are the same, the carbon nano tubes arranged in parallel are used for initial alignment of liquid crystal molecules, and the carbon nano tube layer can be used as a polarizing layer under the polarizing effect of the carbon nano tubes. And because the carbon nanotube layer has good conductivity in the direction parallel to the extending direction of the carbon nanotubes, the carbon nanotube layer also serves as a common electrode layer. Adopt insulating nature isolation layer to separate carbon nanotube layer and the optical alignment substrate layer that thoughtlessly has polarization material, carbon nanotube layer and polarization material electrical insulation each other, when carbon nanotube layer was as public electrode layer, effectively avoided under the long-time break-make electricity condition, the emergence of bad condition such as degradation takes place for polarization material.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural diagram of a composite substrate in the prior art;
fig. 2 is a schematic structural diagram of a transparent conductive substrate according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The following is a detailed description of a method for manufacturing a transparent conductive substrate for a liquid crystal display panel according to an embodiment of the present invention.
In the prior art, a composite substrate is provided, as shown in fig. 1. The composite substrate comprises a substrate 21 and a carbon nanotube layer 23 arranged on the surface of the substrate, wherein the carbon nanotube layer 23 is bonded on the surface of the substrate 21 through a photo-alignment substrate 22. The carbon nanotube layer 23 includes a plurality of carbon nanotubes extending in the same direction, and the photo-alignment substrate 22 has a polarizing material 24 having a molecular arrangement direction identical to the extending direction of the carbon nanotubes.
The directional alignment of the polarizing material at the molecular level, resulting in optical anisotropy of the polarizing material, is the basis for achieving the generation of polarized light. The inventor researches and discovers that when a photoalignment substrate layer containing a polarizing material and a carbon nanotube layer are bonded together, current acts on the polarizing material in a long-time power-on and power-off process when the carbon nanotube layer is used as a common electrode layer due to the special photoelectric characteristics of the polarizing material, such as dichroic organic dyes, including azo dyes, anthraquinone dyes, biphenyl dyes and the like, the organic dyes are easy to degrade, and the service life of the product is greatly reduced.
Based on the above research, the embodiment of the present invention provides a transparent conductive substrate for a liquid crystal display, and as shown in fig. 2, the transparent conductive substrate includes a transparent substrate 31, a carbon nanotube layer 33 bonded to a surface of the substrate through an adhesive layer 32, an insulating isolation layer 34 disposed on the carbon nanotube layer 33 and away from the surface of the adhesive layer, and a photo-alignment substrate layer 35 disposed on the surface of the insulating isolation layer 34. The carbon nanotube layer 33 includes a plurality of carbon nanotubes extending in the same direction, and the photoalignment substrate layer 35 includes a polarization material 36 having a molecular arrangement direction that is the same as the extending direction of the carbon nanotubes.
The transparent substrate mainly plays a supporting role, and a flexible or hard transparent material, such as glass, quartz and the like, can be selected. The substrate may also be a TFT array substrate or a color filter substrate of a liquid crystal display, but is not limited thereto.
The carbon nanotube layer includes at least one carbon nanotube film. The carbon nanotube film can be directly drawn from the carbon nanotube array to obtain a self-supporting film-like structure. Preferably, in this embodiment, the carbon nanotube layer is a carbon nanotube film, and the light transmittance of the carbon nanotube film is higher than 90%.
The material of the adhesive used in the adhesive layer is not limited, and may be a transparent material for adhering the carbon nanotube film to the substrate, such as a pressure-sensitive adhesive, a photosensitive adhesive, and the like, or polyvinylidene fluoride, carboxymethyl cellulose, styrene butadiene rubber, and the like, but is not limited thereto. In this embodiment, one or more of cellulose triacetate, polyimide, and polyamic acid are used as the binder, and the above materials can be used as the photo-alignment substrate at the same time, so that the photo-alignment effect of the carbon nanotube layer can be further improved. Further, the initial state of the adhesive is ethanol liquid containing polyimide, the adhesive is coated on the transparent substrate, then the carbon nanotube film is laid, the carbon nanotube film shrinks in the adhesive liquid due to capillary action, and the carbon nanotube film is laid on the transparent substrate smoothly without generating wrinkles. Polyimide is an insulating material, and is used as an adhesive to further improve the effect of separating the carbon nanotube layer from the photo-alignment substrate layer.
The insulating isolation layer can be made of transparent polymer material with insulating property, such as polyamide and polyethylene. In the embodiment, the insulating isolation layer is prepared by mixing polyvinylidene fluoride polymer powder and an N-methyl pyrrolidone solvent in a mass ratio of 1: 3-4, ultrasonically stirring, and then spraying and drying.
The material of the photoalignment substrate layer is one or more of triacetylcellulose, polyimide and polyamic acid, and in this embodiment, the material of the photoalignment substrate layer is polyimide. The polarizing material in the photoalignment substrate layer is a dichroic organic dye. The dichroic organic dye includes one or more of azo type dye, anthraquinone type dye, biphenyl type dye.
The invention also provides a preparation method of the transparent conductive substrate, which comprises the following steps:
s1, providing a transparent substrate.
And S2, uniformly coating an adhesive layer on the transparent substrate.
The adhesive layer is formed by coating a solution containing an adhesive on a transparent substrate by spin coating or the like.
And S3, laying a carbon nano tube layer on the surface of the adhesive layer, wherein the carbon nano tube layer comprises a plurality of carbon nano tubes with the same extending direction.
The carbon nanotube layer is partially immersed in the binder layer. When the carbon nanotube layer also serves as a common electrode layer, a trace needs to be provided for the carbon nanotube layer in this step.
And S4, curing the adhesive layer, and bonding the carbon nano tube layer on the surface of the transparent substrate.
The step of curing the adhesive layer includes baking the transparent substrate coated with the adhesive layer and the carbon nanotube layer until the adhesive is cured. Preferably, the baking is carried out for 10-40 s at 60-80 ℃, and then the baking is carried out for 60-100 s at 110-120 ℃. Baking at a lower temperature to remove excess solution (e.g., ethanol) and allow the carbon nanotube film to settle onto the transparent substrate. And then curing the adhesive at higher temperature, thereby improving the stability of the combination of the carbon nanotube layer and the transparent substrate.
And S5, forming an insulating isolation layer on the surface of the carbon nanotube layer far away from the adhesive layer.
S6, coating a photo-alignment substrate layer on the surface of the isolation layer, wherein the photo-alignment substrate layer is mixed with a polarization material; and
and S7, curing the photo-alignment substrate layer to ensure that the molecular arrangement direction of the polarization material is the same as the extending direction of the carbon nano tubes.
Further, the step of curing the photoalignment substrate layer includes: and irradiating the light alignment substrate layer with ultraviolet polarized light to enable the light alignment substrate layer to have set light alignment orientation after being cured, wherein the light alignment orientation is parallel to the extending direction of the carbon nano tube.
Further, the step of irradiating the light alignment substrate layer with ultraviolet polarized light includes: and irradiating the light alignment substrate layer from one side of the transparent substrate far away from the carbon nanotube layer by ultraviolet polarized light irradiation.
Further, in the preferred embodiment of the present invention, between the step S5 and the step S6, the method further includes:
s8, scanning the insulating spacer layer with a laser to remove the carbon nanotubes extending outwardly from the surface of the insulating spacer layer.
Further, in the preferred embodiment of the present invention, in step S8, the step of scanning the insulating isolation layer with a laser includes:
s81, arranging the laser beam close to and parallel to the surface of the insulating isolation layer;
s82, the power density is 0.1-0.5 x 103Moving the laser beam at a moving speed of 0.05-0.1 m/s in watt/m/s to scan the laser beam over the surface of the insulating isolation layer to remove the carbon nanotubes extending outward from the surface of the insulating isolation layer.
Get rid of the carbon nanotube who outwards extends from the surface of insulating nature isolation layer, can further strengthen the isolation effect of carbon nanotube layer and optical alignment substrate layer, avoid the polarization material in the optical alignment substrate layer to receive the effect of electric current. Redundant carbon nano tubes can be effectively removed through laser scanning, and material damage is effectively avoided. When the power density is 0.1-0.5 x 103Watt/square meter, moving speed 0.05EWhen the laser beam is moved for scanning at 0.1 m/s, the removal rate of the carbon nano tube extending outwards from the surface of the insulating isolation layer reaches more than 90%, and the micro structure of the carbon nano tube layer and the micro structures of the insulating isolation layer, the adhesive layer and the like cannot be damaged.
Further, in the preferred embodiment of the present invention, in step S4, a plurality of parallel grooves are formed on the surface of the adhesive layer away from the transparent substrate, and the extending direction of the grooves is the same as the extending direction of the carbon nanotubes. The formed plurality of parallel arranged grooves further enhance the photo-alignment effect of the carbon nano tube layer.
Further, in the preferred embodiment of the present invention, between the step S4 and the step S5, the method further includes:
and S9, rubbing the adhesive layer along the extending direction of the carbon nanotubes using a rubbing cloth to deepen the grooves and remove the carbon nanotubes extending outward from the surface of the adhesive layer.
Further, in the preferred embodiment of the present invention, between the step S4 and the step S9, the method further includes:
and S10, covering the surface of the adhesive layer with an electrostatic substrate, and separating the electrostatic substrate after applying a certain pressure, so that the carbon nanotubes extending outwards from the surface of the adhesive layer are adsorbed on the electrostatic substrate.
Preferably, the substrate with static electricity can be PET resin with static electricity, and the surface energy of the PET resin is 150-220 mJ/m2. Applying at 8-12N/cm2And (4) separating after 4-6 s. The carbon nano tubes extending outwards from the surface of the adhesive layer are adsorbed to the PET resin through the ion electrostatic adsorption effect, so that a good removal effect is achieved. And under the action of the action force within the range, the microstructures of the carbon nano layer and the adhesive layer cannot be damaged, and the quality of the product is ensured.
The embodiment of the invention also provides a liquid crystal display screen which comprises a first substrate and a second substrate which are oppositely arranged; and the liquid crystal layer is arranged between the first substrate and the second substrate, and the first substrate and the second substrate are the transparent conductive substrates. Furthermore, the transparent substrate in the first substrate is an existing TFT array substrate, and the transparent substrate in the second substrate is an existing color film substrate structure.
Furthermore, the liquid crystal display screen also comprises a plurality of electrodes which are insulated from each other, and the plurality of electrodes are electrically connected with the carbon nano tube layer respectively.
The liquid crystal display screen manufactured by using the transparent conductive substrate has the advantages of simple structure and excellent performance, and can be used for a long time.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (8)
1. A method for preparing a transparent conductive substrate for a liquid crystal display screen is characterized by comprising the following steps:
s1, providing a transparent substrate;
s2, uniformly coating an adhesive layer on the transparent substrate;
s3, laying a carbon nanotube layer on the surface of the adhesive layer, wherein the carbon nanotube layer comprises a plurality of carbon nanotubes with the same extending direction;
s4, curing the adhesive layer, and adhering the carbon nanotube layer on the surface of the transparent substrate;
s5, forming an insulating isolation layer on the surface of the carbon nanotube layer far away from the adhesive layer;
s6, coating a photo-alignment base material layer on the surface of the insulating isolation layer, wherein the photo-alignment base material layer is mixed with a polarization material; and
s7, curing the photo-alignment substrate layer to enable the molecular arrangement direction of the polarization material to be the same as the extending direction of the carbon nano tube;
the insulating isolation layer is made of a high-molecular transparent material with insulating property.
2. The method of claim 1, further comprising, between step S5 and step S6:
and S8, scanning the insulating isolation layer by using laser to remove the carbon nano tubes extending outwards from the surface of the insulating isolation layer.
3. The method of claim 2, wherein: in step S8, the step of scanning the insulating isolation layer with a laser includes:
s81, arranging the laser beam close to and parallel to the surface of the insulating isolation layer;
and S82, moving the laser beam at a power density of 0.1-0.5 multiplied by 103 watts/square meter and a moving speed of 0.05-0.1 meter/second to enable the laser beam to scan the whole surface of the insulating isolation layer so as to remove the carbon nano tubes extending outwards from the surface of the insulating isolation layer.
4. The method of claim 1, wherein: the step of curing the photoalignment substrate layer includes: and irradiating the photo-alignment substrate layer by adopting ultraviolet polarized light, so that the photo-alignment substrate layer has set photo-alignment orientation after being cured, wherein the photo-alignment orientation is parallel to the extending direction of the carbon nano tube.
5. The method of claim 4, wherein: the step of irradiating the photoalignment substrate layer with ultraviolet polarized light comprises: and irradiating the light alignment substrate layer from one side of the transparent substrate far away from the carbon nano tube layer by the ultraviolet polarized light irradiation.
6. The production method according to claim 3, characterized in that: in step S4, a plurality of parallel grooves are formed on the surface of the adhesive layer away from the transparent substrate, and the extending direction of the grooves is the same as the extending direction of the carbon nanotubes.
7. The method of claim 6, wherein: further included between step S4 and step S5 is:
and S9, rubbing the adhesive layer along the extending direction of the carbon nanotubes by using a rubbing cloth to deepen the grooves and remove the carbon nanotubes extending outwards from the surface of the adhesive layer.
8. The method of claim 7, wherein: further included between step S4 and step S9 is:
and S10, covering the surface of the adhesive layer with an electrostatic substrate, and separating the electrostatic substrate after applying certain pressure so as to enable the carbon nanotubes extending outwards from the surface of the adhesive layer to be adsorbed on the electrostatic substrate.
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| CN201711051291.7A CN107783341B (en) | 2017-10-31 | 2017-10-31 | Preparation method of transparent conductive substrate for liquid crystal display screen |
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| CN201711051291.7A CN107783341B (en) | 2017-10-31 | 2017-10-31 | Preparation method of transparent conductive substrate for liquid crystal display screen |
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| CN107783341B true CN107783341B (en) | 2020-12-08 |
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| KR100413485B1 (en) * | 2001-07-09 | 2003-12-31 | 엘지.필립스 엘시디 주식회사 | Inplane switching mode liquid crystal display device and method for fabricating the same |
| CN1281982C (en) * | 2002-09-10 | 2006-10-25 | 清华大学 | Polarized element and method for manufacturing same |
| CN101526696B (en) * | 2008-03-07 | 2010-11-10 | 清华大学 | LCD |
| CN101566753B (en) * | 2008-04-23 | 2011-03-30 | 鸿富锦精密工业（深圳）有限公司 | Fabricating method of liquid crystal display |
| KR20100073147A (en) * | 2008-12-22 | 2010-07-01 | 엘지전자 주식회사 | Optical sheet |
| KR101066821B1 (en) * | 2009-05-11 | 2011-09-23 | 전북대학교산학협력단 | High performance thin film polarizer |
| CN104698524B (en) * | 2015-02-13 | 2018-04-03 | 上海天马微电子有限公司 | Polarizing film and preparation method thereof, image display panel and image display device |
| CN104932148B (en) * | 2015-06-30 | 2020-10-16 | 厦门天马微电子有限公司 | Composite substrate, liquid crystal display screen and manufacturing method |
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