CN111487816A - Application of thermoplastic alignment layer on liquid crystal base film - Google Patents
Application of thermoplastic alignment layer on liquid crystal base film Download PDFInfo
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- CN111487816A CN111487816A CN202010449426.0A CN202010449426A CN111487816A CN 111487816 A CN111487816 A CN 111487816A CN 202010449426 A CN202010449426 A CN 202010449426A CN 111487816 A CN111487816 A CN 111487816A
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- liquid crystal
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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
- G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
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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
- G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
- G02F1/133723—Polyimide, polyamide-imide
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- Nonlinear Science (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
Abstract
The invention relates to the use of a thermoplastic alignment layer on a liquid crystal-based film comprising two thermoplastic layers and a liquid crystal layer sandwiched between the two thermoplastic layers; the two thermoplastic layers are made of the same or different thermoplastic materials, at least one thermoplastic layer is a thermoplastic alignment layer, and the thermoplastic alignment layer provides alignment for the liquid crystal layer; the two thermoplastic layers are fused to form the partition walls of the liquid crystal layer. The invention is particularly useful where it is desired to tailor or resize the alignment layer, simply by melting/bonding it and using it as a sealing border or separator for the device.
Description
Technical Field
The invention relates to the field of liquid crystal, in particular to application of a thermoplastic alignment layer on a liquid crystal-based film.
Background
Since the first liquid crystal display (L CD) in 1964 using Dynamic Scattering Mode (DSM), liquid crystal based devices have been in use in the display field for over 50 years, although liquid crystal structures can and do find use in many other fields, displays remain the dominant application of liquid crystal based devices and have enjoyed great commercial success.
Although the liquid crystal based smart window film and the liquid crystal display operate in principle in a similar manner, the most fundamental difference in mass production when the liquid crystal molecules act as light valves is the size of the cell. While there are many televisions and other display sizes, in most cases the display screen tends to have a constant aspect ratio, for example (16:9) for high definition televisions. Limiting the aspect ratio allows the manufacturing company to discretize the dimensions that it has to produce, making production simpler. However, the size of the window can be largely any size, varying in centimeters, and is therefore difficult to produce.
Liquid crystal-based devices typically require an alignment layer to define the orientation of the liquid crystal material. There are many alignment materials in liquid crystal applications, but the most common is polyimide material. Polyimides have been common in the production of liquid crystal displays due to their chemical and electrical properties, even extending to other liquid crystal applications. Polyimide is known as a thermosetting polymer that hardens irreversibly by curing.
Disclosure of Invention
In view of the deficiencies of the prior art, it is an object of the present invention to provide a use of a thermoplastic alignment layer on a liquid crystal-based film, in liquid crystal applications requiring custom sizing or adjustable sizing, alternatively using a thermoplastic material as the alignment layer, which can simply melt/adhere the alignment layer and act as a sealing border or spacer for the device, thereby conveniently obtaining a liquid crystal-based film of the desired size.
To achieve the object of the present invention, the present invention provides a use of a thermoplastic alignment layer on a liquid crystal-based film comprising two thermoplastic layers and a liquid crystal layer sandwiched between the two thermoplastic layers; the two thermoplastic layers are made of the same or different thermoplastic materials, at least one thermoplastic layer is a thermoplastic alignment layer, and the thermoplastic alignment layer provides alignment for the liquid crystal layer; the two thermoplastic layers are fused to form the partition walls of the liquid crystal layer.
From the above, the present invention uses thermoplastic materials as alignment layers, which can form the seal boundary or spacer of the liquid crystal device, suitable for applications where customized or adjustable dimensions are required, simply by fusing alignment layers and/or thermoplastic layers on both sides of the liquid crystal layer the thermoplastic materials can achieve alignment of liquid Crystals, such as Symmetry of the alignment polymer and the resin and in surface stabilized display [ J ]. Bernt O.Myrvold, <ransition = L &gL &l/T G I Q Y S L S,1991, VO L. 10, No.6,771,783; Far-Field pattern Dye-bonded from r-alloy 463, which is also disclosed as thermoplastic materials in the Field of crystal sealing films [ 12 ] No. 3, No. 2, No. 3, No. 2, No. 3, No. 2, No. 4, No. 3, No. 2, No. 3, No. 4, No. 7, No. 2, No. 4, No. 7, No. 4, No. 3, No. 4, No. 2, No. 7, No. 4, No. 3, No. 4, No. 3, No. 4, No. 2, No. 4, No. 3, No. 4, No. 3, No. 4.
The further technical proposal is that the fusing of the two thermoplastic layers is at least one of hot pressing, ultrasonic welding and laser welding.
From the above, it can be seen that the present invention can be selected among a variety of ways to promote the melting of the thermoplastic material such that two thermoplastic layers, including the thermoplastic alignment layer, can be melted to bond together to form the partition walls.
A further solution is that fusing the two thermoplastic layers comprises pressing a sealing means against at least one of the two thermoplastic layers, the part of the sealing means intended to be in contact with the thermoplastic layers having a curved profile with an arc-shaped bulge.
As can be seen, the present invention can be sealed with a sealing mechanism, preferably having a curved profile, so that when pressed against the thermoplastic layer, the liquid crystal at the fused portion is squeezed out, avoiding the presence of capsular liquid crystal material remaining in the partition walls.
The liquid crystal base film further comprises a substrate, and the thermoplastic layers are respectively arranged on the substrate; the thermoplastic layer has a melting point lower than the melting point of the substrate.
From the foregoing, it can be seen that the present invention can use a substrate to provide support and protection for a liquid crystal-based film, and a thermoplastic layer can be coated onto the substrate.
The further technical scheme is that at least one substrate is a flexible substrate.
As can be seen, the present invention preferably employs at least one flexible substrate to facilitate the lamination of one thermoplastic layer against another thermoplastic layer to facilitate bonding of the two when the sealing mechanism is pressed against the substrate.
The further technical proposal is that the thermoplastic alignment layer is formed by mechanical friction of thermoplastic materials, or the thermoplastic alignment layer is made of thermoplastic materials with side chains.
From the above, the thermoplastic alignment layer of the present invention can realize alignment function by mechanical friction or with side chains, so that the liquid crystal material in the liquid crystal layer is oriented in parallel or vertically. In general, when the surface energy of the alignment layer is lower than the strong intermolecular force between liquid crystals, the long axes of nematic phase molecules are aligned perpendicular to the surface. When the critical surface tension of the surface is greater than the surface tension of the liquid crystal, the liquid crystal molecules are aligned in parallel to reduce the surface free energy. For example, the use of some low polarity side chains can lower the surface energy to promote homeotropic alignment of the liquid crystals, and the use of a smooth surface can increase the surface tension to promote parallel alignment of the liquid crystals.
The thermoplastic material is selected from at least one of polyamide, poly (meth) acrylate, polyvinyl alcohol, polysiloxane, polyester, cellulose, polyhydroxystyrene, and modified products thereof.
As can be seen from the above, the present invention can select suitable materials from the above-mentioned materials as the alignment layer according to the melting point, the pretilt angle of the liquid crystal molecules, the anchoring energy, and the like, and these materials can achieve alignment and simultaneously achieve melt bonding to form the partition walls. The materials may be modified, for example by modification to increase solubility to facilitate coating, for example by modification to adjust melting point, etc.
The further technical proposal is that the side chain contains at least one of alkyl and fluorine-containing alkyl.
As can be seen from the above, the present invention can employ side chains having the above groups to provide a lower energy on the surface and a homeotropic alignment of the liquid crystal. The polymer material may itself have the above side chain, for example, poly (dodecyl 2-methacrylate), or may be grafted by a chemical reaction or the like, and the main chain of the polymer material may be linked to the alkyl group or the fluoroalkyl group in the side chain by at least one of a single bond, an ether bond, an amide bond, and an ester bond. TW201631131A also discloses in the prior art that a similar side chain structure can achieve the alignment function.
Preparing a raw sheet of the liquid crystal-based film, and fusing two thermoplastic layers on the raw sheet once or for multiple times according to the required size to form a liquid crystal area surrounded by partition walls; the original sheet was cut along the partition walls to obtain a cut sheet of a liquid crystal-based film of a desired size.
Therefore, the invention can firstly produce the original sheet with relatively fixed size, then separate the liquid crystal area according to the size required by practical application, and obtain the cutting sheet with required size after cutting, thus being applicable to required occasions. The invention is especially suitable for occasions needing to customize and adjust the size, and is beneficial to reducing the production cost and improving the application flexibility of the liquid crystal base film.
The further technical scheme is that the original sheet is prepared by a roll-to-roll or roll-to-sheet process.
Therefore, the liquid crystal-based film original sheet can be rapidly produced in batch by adopting the conventional roll-to-roll process or roll-to-sheet process, so that the production cost is reduced and the production efficiency is improved.
A further solution is to fuse the two thermoplastic layers one or more times on the cut sheet and cut along the dividing wall, adjusting the size of the cut sheet.
Therefore, the liquid crystal base film can be separated and cut again after being separated and cut, and the size can be adjusted in time according to actual conditions.
The further technical proposal is that the liquid crystal layer is made of thermochromic liquid crystal base materials; and the liquid crystal base film is combined on the window to obtain the intelligent window which changes color along with temperature change.
From the above, the invention is particularly suitable for the liquid crystal-based intelligent window film with the required customized size, the liquid crystal material in the film can change color along with the temperature, for example, the liquid crystal material of the liquid crystal layer can be composed of nematic liquid crystal and dichroic dye, the nematic liquid crystal is arranged in disorder at high temperature, the dichroic dye is arranged in disorder along with the nematic liquid crystal, the dye absorbs more light, so that the visible light transmittance is low, the nematic liquid crystal is arranged in orientation at low temperature, the dye is arranged in order along with the nematic liquid crystal, the dye absorbs less light, and the visible light transmittance is low. After the liquid crystal layer is separated, each liquid crystal area can still realize the thermochromic function. Without being limited thereto, the invention can also be used in any liquid crystal based device, wherein the alignment layer may also be used as a sealant or spacer.
Compared with the prior art, the invention can obtain the following beneficial effects:
the invention applies the thermoplastic alignment layer to the liquid crystal base film, simplifies the production flow of the liquid crystal base film, can realize batch production, can conveniently carry out size customization and adjustment, does not need to prepare different sizes when producing original sheets, does not need to separate or seal glue or photocuring materials, and reduces the production and application cost of the liquid crystal base film.
Drawings
FIG. 1 is a schematic view of the structure of a liquid crystal-based film in an embodiment of the present invention.
Fig. 2 is a schematic view showing a structure of a fusion-separation seal for a liquid crystal-based film according to an embodiment of the present invention.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Detailed Description
Liquid crystal based devices typically use layers to provide parallel or perpendicular alignment, the pretilt angle of the liquid crystal director being close to 0 ° or 90 ° respectively with respect to the surface. Common materials to achieve the desired alignment are typically polyimide materials with functional side chain terminations to provide the desired pretilt angle. The present invention uses a thermoplastic material, such as polyamide, not only to provide the desired alignment of the liquid crystal molecules, but also as a regional sealant for the liquid crystal device. The thermoplastic material may be selected based on properties such as melting point, pretilt angle of liquid crystal molecules, anchoring energy, and dielectric resistance, and may be selected from commercially available materials or synthetic polymers, such as polymers having pendant functional groups. Then, referring to fig. 1, the polymer material is coated on two substrates 3 of the device, respectively, based on the layer gap (cellgap) of the liquid crystal layer 2, to form two thermoplastic layers 1, and the liquid crystal layer 2 is positioned between the two thermoplastic layers 1, to form a liquid crystal-based film or a liquid crystal device. Once the substrates and the liquid crystal layer of the liquid crystal device are placed together, they may be sealed by heat sealing, for example, using heat sealing, ultrasonic welding, laser welding, or the like. Referring to fig. 2, on the flexible substrate 3, the curved geometry of the sealing mechanism 4 is capable of displacing liquid crystal in the liquid crystal layer 2 and melt-bonding the thermoplastic layers 1 together. The device sealed in this way can thereafter be dimensioned in the same sealing method according to the requirements of use.
In one embodiment of the present invention, soluble nylon may be used as the parallel alignment layer. The soluble nylon is prepared by modifying nylon 66. The material can be dissolved in methanol and coated on a substrate for a liquid crystal-based film or device. Coatings prepared in this way can provide good parallel alignment of typical nematic liquid crystals (e.g. cyanobiphenyls). To provide a specific alignment direction, the coating was mechanically rubbed with a lint-free velvet cloth, just like any other parallel alignment coating. Once the two substrates and the liquid crystal layer are assembled, the device can be perimeter sealed by hot pressing. The heat seal often has a curved profile and this geometry allows the heat seal to push liquid crystal away from the flexible substrate (e.g. polycarbonate film) allowing better bonding between the two alignment layers to form the partitioning walls without the capsular liquid crystal within the partitioning walls.
In another embodiment, poly (dodecyl 2-methacrylate) can be used in a similar manner to soluble nylon for liquid crystal based devices requiring vertical alignment, the material can be dissolved in toluene and coated on a substrate for liquid crystal based films/devices.
Finally, it should be emphasized that the above-described embodiments are merely preferred examples of the invention, which is not intended to limit the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. Use of a thermoplastic alignment layer on a liquid crystal based film, characterized in that:
the liquid crystal-based film includes two thermoplastic layers and a liquid crystal layer sandwiched between the two thermoplastic layers; two of the thermoplastic layers are made of the same or different thermoplastic materials, at least one of the thermoplastic layers is a thermoplastic alignment layer providing alignment for the liquid crystal layer;
fusing the two thermoplastic layers to form the partition walls of the liquid crystal layer.
2. Use of a thermoplastic alignment layer according to claim 1 on a liquid crystal based film, wherein:
the two thermoplastic layers are fused by at least one selected from the group consisting of heat pressing, ultrasonic welding and laser welding.
3. Use of a thermoplastic alignment layer according to claim 1 or 2 on a liquid crystal based film, characterized in that:
fusing the two thermoplastic layers includes pressing a sealing mechanism against at least one of the two thermoplastic layers, the portion of the sealing mechanism for contacting the thermoplastic layers having an arcuate convex curved profile.
4. Use of a thermoplastic alignment layer according to claim 1 or 2 on a liquid crystal based film, characterized in that:
the liquid crystal-based film further comprises a substrate on which the thermoplastic layer is disposed; the thermoplastic layer has a melting point lower than the melting point of the substrate.
5. Use of a thermoplastic alignment layer according to claim 4 on a liquid crystal based film, wherein:
at least one of the substrates is a flexible substrate.
6. Use of a thermoplastic alignment layer according to claim 1 or 2 on a liquid crystal based film, characterized in that:
the thermoplastic alignment layer is formed by mechanical friction of a thermoplastic material, or the thermoplastic alignment layer is made of a thermoplastic material with side chains.
7. Use of a thermoplastic alignment layer according to claim 6 on a liquid crystal based film, wherein:
the thermoplastic material is selected from at least one of polyamide, poly (methyl) acrylate, polyvinyl alcohol, polysiloxane, polyester, cellulose, polyhydroxystyrene and modified substances thereof;
the side chain contains at least one of an alkyl group and a fluoroalkyl group.
8. Use of a thermoplastic alignment layer according to claim 1 or 2 on a liquid crystal based film, characterized in that:
preparing a master of said liquid crystal-based film and fusing two of said thermoplastic layers on said master one or more times according to the desired dimensions to form a liquid crystal region surrounded by said partition walls; and cutting the original sheet along the partition walls to obtain a cut sheet of the liquid crystal-based film of a desired size.
9. Use of a thermoplastic alignment layer according to claim 8 on a liquid crystal based film, wherein:
the original sheet is prepared by a roll-to-roll or roll-to-sheet process;
fusing the two thermoplastic layers on the cutting sheet and cutting along the partition wall one or more times, adjusting the size of the cutting sheet.
10. Use of a thermoplastic alignment layer according to claim 1 or 2 on a liquid crystal based film, characterized in that:
the liquid crystal layer is made of a thermochromic liquid crystal-based material;
the liquid crystal base film is combined on a window to obtain the intelligent window changing color along with temperature change.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010449426.0A CN111487816A (en) | 2020-05-25 | 2020-05-25 | Application of thermoplastic alignment layer on liquid crystal base film |
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| CN202010449426.0A CN111487816A (en) | 2020-05-25 | 2020-05-25 | Application of thermoplastic alignment layer on liquid crystal base film |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117075378A (en) * | 2023-10-17 | 2023-11-17 | 上海隆昇光电新材料有限公司 | PDLC film and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101512396A (en) * | 2006-08-01 | 2009-08-19 | 光学转变公司 | Oriented polymeric sheets exhibiting dichroism and articles containing the same |
| CN102187262A (en) * | 2008-08-20 | 2011-09-14 | 雷文布里克有限责任公司 | Methods for fabricating thermochromic filters |
| CN110780503A (en) * | 2019-11-19 | 2020-02-11 | 华南师范大学 | Color-changeable intelligent window |
-
2020
- 2020-05-25 CN CN202010449426.0A patent/CN111487816A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101512396A (en) * | 2006-08-01 | 2009-08-19 | 光学转变公司 | Oriented polymeric sheets exhibiting dichroism and articles containing the same |
| CN102187262A (en) * | 2008-08-20 | 2011-09-14 | 雷文布里克有限责任公司 | Methods for fabricating thermochromic filters |
| CN110780503A (en) * | 2019-11-19 | 2020-02-11 | 华南师范大学 | Color-changeable intelligent window |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117075378A (en) * | 2023-10-17 | 2023-11-17 | 上海隆昇光电新材料有限公司 | PDLC film and preparation method thereof |
| CN117075378B (en) * | 2023-10-17 | 2024-01-30 | 上海隆昇光电新材料有限公司 | PDLC film and preparation method thereof |
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