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1. 发明专利

JPH10221668A LIQUID CRYSTAL ELEMENT AND ITS PRODUCTION 失效
公开(公告)号：JPH10221668A
公开(公告)日：1998-08-21
申请号：JP33619997
申请日：1997-12-05
申请人： SHARP KK , SECR DEFENCE BRIT
发明人： SAKO SADAHIRO , MIYAZAKI FUMI , SAKAIGAWA AKIRA , MUKAIDONO MITSUHIRO , GASS PAUL ANTHONY , TOWLER MICHAEL JOHN , MCDONNELL DAMIEN GERARD , JONES JOHN CLIFFORD
IPC分类号： G02F1/13 , G02F1/137 , G02F1/141
摘要： PROBLEM TO BE SOLVED: To obtain a liquid crystal element formed with domains in a liquid crystal material by a simple method by changing the conditions to be imparted to the liquid crystal material so as to separate dopants from the liquid crystal material in order to impart plural nucleation points. SOLUTION: A liquid crystal compn, and a monomer having one photopolymerizable functional group are mixed and this mixture is injected to electrode substrates 13, 14. In this stage, an empty cell is arranged in a vacuum chamber and the mixture is injected into the cell from an injection port while the mixture is kept heated. This cell is cooled down to room temp. at a prescribed rate after the injection. The monomer is polymerized by irradiating the monomer with light, such as UV rays, at the temp. at which the liquid crystal compsn. exhibits a smectic phase in this stage. The mixture in the cell is heated again up to the temp. at which the liquid crystal compsn. exhibits a phase on the higher temp. side than the smectic phase after the formation of the monomer. The cell is thereafter cooled down to room temp. at the prescribed rate. The restrainings of the polymer by the interaction between the polymer and oriented films 7, 8 and between the polymer and the liquid crystal molecules, respectively, are released by executing such stages.

2. 发明专利

GB2336930B Light modulating devices 未知
公开(公告)号：GB2336930B
公开(公告)日：2002-05-08
申请号：GB9809013
申请日：1998-04-29
申请人： SHARP KK , SECR DEFENCE BRIT
发明人： ULRICH DIANA CYNTHIA , TOWLER MICHAEL JOHN
IPC分类号： G02F1/133 , G09G3/20 , G09G3/34 , G09G3/36

3. 发明专利

GB2337608A Reduction of ionic memory effect in ferroelectric liquid crystals 未知
公开(公告)号：GB2337608A
公开(公告)日：1999-11-24
申请号：GB9810469
申请日：1998-05-16
申请人： SHARP KK , SECR DEFENCE BRIT
发明人： ULRICH DIANA CYNTHIA , TOWLER MICHAEL JOHN , BONNETT PAUL , KABE MASAAKI
IPC分类号： G02F1/137 , G02F1/133 , G02F1/141 , G09G3/20 , G09G3/36
摘要： A method of reducing the effects of ionic memory in a ferroelectric liquid crystal (FLC) material 7 to which a switching pulse 84, 88 is applied comprises the steps of: a) adding an ionic dopant to the FLC material, the ionic dopant providing ions having a fast response to an applied electric field; and b) following said switching pulse by a first pulse 86, 90 of opposite polarity to said switching pulse, in such a way that said first pulse reduces any ionic reversal field created by said switching pulse, but does not destabilise the state to which the FLC material is switched by said switching pulse.

4. 发明专利

GB2347547B Addressing scheme for liquid crystal displays 未知
公开(公告)号：GB2347547B
公开(公告)日：2003-02-12
申请号：GB9904648
申请日：1999-03-02
申请人： SHARP KK , SECR DEFENCE BRIT
发明人： ULRICH DIANA CYNTHIA , BONNETT PAUL , TOWLER MICHAEL JOHN
IPC分类号： G02F1/133 , G09G3/20 , G09G3/36

5. 发明专利

DE69410240D1 未知
公开(公告)号：DE69410240D1
公开(公告)日：1998-06-18
申请号：DE69410240
申请日：1994-01-26
申请人： SECR DEFENCE BRIT
发明人： GRAHAM ALISTAIR , HUGUES JONATHAN RENNIE , TOWLER MICHAEL JOHN
IPC分类号： G02F1/133 , G09G3/36
摘要： PCT No. PCT/GB94/00150 Sec. 371 Date Aug. 14, 1995 Sec. 102(e) Date Aug. 14, 1995 PCT Filed Jan. 26, 1994 PCT Pub. No. WO94/18665 PCT Pub. Date Aug. 18, 1994The invention provides a ferro-electric liquid crystal display (FLCDs) with reduced voltages requirements for driver circuits. This enables standard drivers circuits designed to rms address twisted nematic type of displays, to be used for FLCDs. Displays are formed by cells containing smectic liquid crystal material. The cell walls are surface treated and carry e.g. row and column electrodes forming an x,y matrix of addressable display elements. The smectic liquid crystal material switches between two states upon application of a dc pulse of appropriate amplitude, polarity, and time. Addressing waveforms are strobe waveforms, e.g. two pulses of opposite polarity in successive time slots, applied to each row in turn. Data waveforms are, e.g. dc pulses of alternate polarity with each pulse lasting one time slot ts. Two data waveforms are needed to switch between the two states; one data waveform is the inverse of the other. Typically a strobe waveform pulse may be 50 volts. In the invention a voltage reduction waveform (VRW) is added to both strobe and data waveforms. This has the effect of reducing the maximum amplitude of voltage needed by the driver circuits, whilst leaving the resultant voltage appearing at a display element at the same value as if VRW were not used. With a reduced voltage requirement, driver circuits previously used for relatively low voltage menatic material type of displays can be used to switch smectic materials.

6. 发明专利

CA2182962A1 BISTABLE NEMATIC LIQUID CRYSTAL DEVICES 未知
公开(公告)号：CA2182962A1
公开(公告)日：1995-08-17
申请号：CA2182962
申请日：1995-01-30
申请人： SECR DEFENCE BRIT
发明人： BRYAN-BROWN GUY PETER , MCDONNELL DAMIEN GERARD , TOWLER MICHAEL JOHN , BANCROFT MARTIN STUART
IPC分类号： G02F1/1337 , G02F1/1339 , G02F1/139
摘要： The invention provides a nematic liquid crystal device with two bistable switched states. The device comprises two cell walls carrying electrodes structures and enclosed a layer of a nematic liquid crystal material. The cell walls are treated to provide a bigrating on one or both walls. The bigrating is a shaped surface that permits liquid crystal molecules at a surface to lie in two different angular directions, e.g. 45.degree. or 90.degree. apart, in contrast with conventional surface alignments which align liquid crystal molecules in a single direction at a surface. For a cell with bigratings on both walls the two alignment direction on both walls are in register. Polarisers are arranged in front and behind the cell with their optical axes orthogonal and with the optical axis of one polariser parallel to one of the switched alignments. In this example, as the material is switched between the two alignment states the polariser transmits or blocks light. The bigratings may be symmetric or asymmetric, in which later case an amount of surface tilt is obtained. Appropriate surface tilt on both cell walls may give a splayed molecular configuration in both switched states. For splayed configurations, the device may be electrically switched using flexoelectric coupling. For other configurations the device may be switched by use of dc pulses in combination with chiral ions in the liquid crystal material. The bigratings may be produced by interferography, photolithography, embossing, ruling, or transferred from a carrier layer. A bigrating on one cell wall may be combined with a conventional monograting or e.g. rubbing alignment treatment on the other cell wall. In this case the material is twisted in both its switched states.

7. 发明专利

GB2347547A Addressing scheme for liquid crystal displays 未知
公开(公告)号：GB2347547A
公开(公告)日：2000-09-06
申请号：GB9904648
申请日：1999-03-02
申请人： SHARP KK , SECR DEFENCE BRIT
发明人： ULRICH DIANA CYNTHIA , BONNETT PAUL , TOWLER MICHAEL JOHN
IPC分类号： G02F1/133 , G09G3/20 , G09G3/36
摘要： A method of addressing pixels of a liquid crystal display comprising pixels arranged in a plurality of columns and rows comprises the steps of: a) applying data pulses to the columns of pixels, said data pulses being members of a data set having first and second extreme data types 40, 42; b) dividing the rows of pixels into a plurality of pairs of rows of pixels and, for each pair in turn, applying normal and inverted strobe pulses 44, 46 respectively to the two rows of each pair; and c) applying a compensation pulse 56 to each pixel in such a way that, at least for said two extreme data types 40, 42, the switching 48, 60 and non-switching 50, 58 resultants are of substantially the same shape, or at least more similar in shape.

8. 发明专利

GB2320103A Liquid crystal devices 未知
公开(公告)号：GB2320103A
公开(公告)日：1998-06-10
申请号：GB9625324
申请日：1996-12-05
申请人： SHARP KK , SECR DEFENCE BRIT
发明人： MCDONNELL DAMIEN GERARD , GASS PAUL ANTHONY , TOWLER MICHAEL JOHN , JONES JOHN CLIFFORD
IPC分类号： G02F1/137 , G02F1/139 , G02F1/141
摘要： A mixture of a ferroelectric or anti-ferroelectric liquid crystal material and a monomer having a single photopolymeric functional group is injected in the space between two electrode substrates while heat is applied. After cooling of the mixture it is irradiated with ultraviolet light at a temperature at which the liquid crystal material remains in the smectic phase so as to polymerise the monomer. Areas of liquid crystal material requiring different threshold voltages for switching are thereby produced. Alternatively such areas can be produced by changing the conditions applied to a mixture of liquid crystal material with a suitable dopant so as to cause separation of the dopant out of the liquid crystal material in order to provide a polarity of nucleation points for controlling domain formation within the liquid crystal material. Such control of domain formation can be used to provide greyscale in a liquid crystal device.

9. 发明专利

CA2182964A1 LIQUID CRYSTAL DEVICE ALIGNMENT 未知
公开(公告)号：CA2182964A1
公开(公告)日：1995-08-17
申请号：CA2182964
申请日：1995-01-30
申请人： SECR DEFENCE BRIT
发明人： BRYAN-BROWN GUY PETER , MCDONNELL DAMIEN GERARD , TOWLER MICHAEL JOHN
IPC分类号： G02F1/1335 , G02F1/1337 , G02F1/1339
摘要： The invention provides a liquid crystal device having an aligned and surface tilted liquid crystal layer contained between two cell walls. The cell walls carry electrodes for applying voltages across the layer thickness to provide a display. The alignment is provided by a layer of a material that undergoes optically induced ordering during cross linking. That is, a material capable of aligning liquid crystal molecules after cross linking with polarised light. One such material is polyvinylcinnamate. The aligning layer is profiled with an asymmetric grating, e.g. approximately sawtooth in cross section by interferometer, oblique incidence photolithography, or embossing. The shape of the grating provides the surface tilt. The liquid crystal material may be nematic, cholesteric, or smetic.

10. 发明专利

CA2182963A1 LIQUID CRYSTAL DEVICE ALIGNMENT 未知
公开(公告)号：CA2182963A1
公开(公告)日：1995-08-17
申请号：CA2182963
申请日：1995-01-30
申请人： SECR DEFENCE BRIT
发明人： BRYAN-BROWN GUY PETER , MCDONNELL DAMIEN GERARD , TOWLER MICHAEL JOHN
IPC分类号： G02F1/1335 , G02F1/1337 , G02F1/1339 , G02F1/139
摘要： A twisted nematic type of liquid crystal device comprises two cell walls enclosing a layer of a nematic or long pitch cholesteric liquid crystal material. The device has both an alignment direction and a surface tilt provided by an asymmetric groove structure alignment on one or both walls. The alignment treatment may be provided by a shaped layer of a photolithographic material. Embossing, ruling, or transferred from a carrier layer material may alternatively provide the alignment. The amount of twist may be multiples of about 90.degree. and the device arranged between two polarisers.

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