GB2315877A - Liquid crystal alignment materials and devices - Google Patents
Liquid crystal alignment materials and devicesInfo
- Publication number
- GB2315877A GB2315877A GB9724101A GB9724101A GB2315877A GB 2315877 A GB2315877 A GB 2315877A GB 9724101 A GB9724101 A GB 9724101A GB 9724101 A GB9724101 A GB 9724101A GB 2315877 A GB2315877 A GB 2315877A
- Authority
- GB
- United Kingdom
- Prior art keywords
- liquid crystal
- polymer
- alignment layer
- layer
- per square
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000004973 liquid crystal related substance Substances 0.000 title abstract 6
- 239000000463 material Substances 0.000 title abstract 2
- 229920000642 polymer Polymers 0.000 abstract 4
- 125000004432 carbon atom Chemical group C* 0.000 abstract 3
- 210000002858 crystal cell Anatomy 0.000 abstract 2
- 125000001570 methylene group Chemical group [H]C([H])([*:1])[*:2] 0.000 abstract 2
- 239000004990 Smectic liquid crystal Substances 0.000 abstract 1
- 125000000217 alkyl group Chemical group 0.000 abstract 1
- 125000005577 anthracene group Chemical group 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 210000004027 cell Anatomy 0.000 abstract 1
- 230000003098 cholesteric effect Effects 0.000 abstract 1
- 229940114081 cinnamate Drugs 0.000 abstract 1
- 238000000151 deposition Methods 0.000 abstract 1
- 125000005647 linker group Chemical group 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- WBYWAXJHAXSJNI-VOTSOKGWSA-M trans-cinnamate Chemical group [O-]C(=O)\C=C\C1=CC=CC=C1 WBYWAXJHAXSJNI-VOTSOKGWSA-M 0.000 abstract 1
Classifications
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- 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
An alignment layer for a liquid crystal device comprises or containing a polymer of structure (I) in which C represents a carbon atom, A is selected from H, Cl, F, CN, CO 2 R, OCOR, OR, where R is a straight chain or branched alkyl group having 1 to 15 carbon atoms, X and Y are independently selected from the same groups as A, subject to at least one of X and Y on each C atom being selected from F and H, B is a linking group comprising a single bond, or a chain of from 1 to 15 methylene groups in which one or more non-adjacent methylenes may be replaced by O, CO 2 , OCO, P is a photoactive group selected from cinnamate or anthracene groups substituted with at least one group selected from F, Cl, CN, CF 3 , OCF 3 , Br, wherein the interfacial energy of the polymer surface is within 3.0 ergs per square centimetre if the liquid crystal surface energy, and in the range 35 to 50 ergs per square centimetre. A method of providing an alignment layer on a surface of a liquid crystal cell wall includes the step of depositing a layer of a polymer containing at least one polymer as described above on the surface, followed by irradiation with polarised actinic light, and controlling the exposure time and/or intensity of light used to provide a selected value of pretilt in a liquid crystal placed in contact with the exposed layer. The alignment layer formed as above may be used to provide one or both alignment layers on the two walls of a liquid crystal cell. The cell may incorporate nematic, cholesteric, or a smectic liquid crystal material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9724101A GB2315877B (en) | 1996-04-03 | 1997-03-19 | Liquid crystal alignment materials and devices |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB9607059.4A GB9607059D0 (en) | 1996-04-03 | 1996-04-03 | Liquid crystal alignment materials and devices |
| GB9724101A GB2315877B (en) | 1996-04-03 | 1997-03-19 | Liquid crystal alignment materials and devices |
| PCT/GB1997/000745 WO1997038349A1 (en) | 1996-04-03 | 1997-03-19 | Liquid crystal alignment materials and devices |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9724101D0 GB9724101D0 (en) | 1998-01-14 |
| GB2315877A true GB2315877A (en) | 1998-02-11 |
| GB2315877B GB2315877B (en) | 2000-10-04 |
Family
ID=26309056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9724101A Expired - Fee Related GB2315877B (en) | 1996-04-03 | 1997-03-19 | Liquid crystal alignment materials and devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2315877B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0611786A1 (en) * | 1993-02-17 | 1994-08-24 | F. Hoffmann-La Roche Ag | Orientation layer for liquid crystals |
| DE4417409A1 (en) * | 1993-05-20 | 1994-11-24 | Gold Star Co | Thermostable photopolymer material for alignment of liquid crystals |
| GB2281977A (en) * | 1993-09-18 | 1995-03-22 | Gold Star Co | Orientation film for a liquid crystal display |
| EP0742471A2 (en) * | 1995-05-10 | 1996-11-13 | Stanley Electric Co., Ltd. | Arrangement for rubbingless orientation of liquid crystals with tilt |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9519860D0 (en) * | 1995-09-29 | 1995-11-29 | Secr Defence | Polymers for liquid crystal alignment |
| KR0179115B1 (en) * | 1995-11-20 | 1999-05-01 | 구자홍 | Liquid crystal alignment photosensitive material and liquid crystal display device using the same |
| KR0181782B1 (en) * | 1995-12-08 | 1999-05-01 | 구자홍 | Bend-oriented liquid crystal cell manufacturing method using light |
-
1997
- 1997-03-19 GB GB9724101A patent/GB2315877B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0611786A1 (en) * | 1993-02-17 | 1994-08-24 | F. Hoffmann-La Roche Ag | Orientation layer for liquid crystals |
| DE4417409A1 (en) * | 1993-05-20 | 1994-11-24 | Gold Star Co | Thermostable photopolymer material for alignment of liquid crystals |
| GB2281977A (en) * | 1993-09-18 | 1995-03-22 | Gold Star Co | Orientation film for a liquid crystal display |
| EP0742471A2 (en) * | 1995-05-10 | 1996-11-13 | Stanley Electric Co., Ltd. | Arrangement for rubbingless orientation of liquid crystals with tilt |
Non-Patent Citations (1)
| Title |
|---|
| Japanese Journal of Applied Physics vol.34 no. 8A pp.L1000-2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2315877B (en) | 2000-10-04 |
| GB9724101D0 (en) | 1998-01-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20100319 |