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公开(公告)号：EP0301020B1
公开(公告)日：1993-09-01
申请号：EP87902581.5
申请日：1987-04-01
IPC分类号： G02F1/137
CPC分类号： G02F1/141
摘要： A liquid crystal display (1, 20) is arranged to provide very low minimum light transmission in one of its two switchable states. This makes it useful for a shutter (Fig. 1) and for high contrast digital displays (Fig. 2). A layer (14) of a chiral smectic liquid crystal material is contained between two cell walls (9, 10) carrying electrode structures (11, 12). The liquid crystal material has the following phases with temperature: isotropic$(1,4)$cholesteric$(1,4)$chiral smectic$(1,4)$solid. The cholesteric pitch is large. The cell walls are surface treated to provide a parallel alignment of liquid crystal molecules. Crossed polarisers (2, 3) are arranged either side of the cell walls, one (2) aligned with its optical axis parallel to the surface alignment of the adjacent cell wall (9). The device is switched (5, 5) by means of +/- d.c. voltage pulses and utilises the ferro electric effect.
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公开(公告)号：EP0310620B1
公开(公告)日：1992-09-02
申请号：EP87904077.2
申请日：1987-06-23
发明人： GRAY, George, William , LACEY, David , TOYNE, Kenneth, Johnson , SCROWSTON, Richard, Michael , JACKSON, Adam , CHAN, Lawrence, Kam, Ming , SHENOUDA, Ibrahim, Gindy , BRADSHAW, Madeline, Joan , BRIMMELL, Victoria , CONSTANT, Jennifer , RAYNES, Edward, Peter
IPC分类号： C07C69/94 , C07C255/17 , C07C255/32 , C09K19/12 , C09K19/20 , C09K19/30
CPC分类号： C07C255/00 , C09K19/12 , C09K19/126 , C09K19/2021 , C09K19/2028 , C09K19/3003 , C09K19/3068
摘要： Optically active compounds of formula (I), where X has a structure (II) and B is C1-12 alkyl, a chiral group or a group having a general structure (III), where R and R' are H, C1-12 alkyl, alkoxy, alkylcarbonyloxy, or alkoxycarbonyl, each ring (IV) and (V) is the same or different, A and D are single bonds or bridging groups, each a and d is 0 or 1; Z, Z' are CN, Cl, F, Br or CF3; provided when Z is CN or Cl, then when B is alkyl X-Y is not (VI) or (VII). Ferroelectric smectic liquid crystal mixtures containing these compounds are also described.
摘要翻译： 式（I）的光学活性化合物，其中X具有结构（II）且B为C 1-12烷基，手性基团或具有通式结构（III）的基团，其中R和R'为H，C1-12 烷基，烷氧基，烷基羰基氧基或烷氧基羰基，每个环（IV）和（V）相同或不同，A和D为单键或桥连基团，a和d各自为0或1; Z，Z'是CN，Cl，F，Br或CF 3; 当Z是CN或Cl时，则当B是烷基时，X-Y不是（VI）或（VII）。 还描述了含有这些化合物的铁电近晶液晶混合物。
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3.发明授权
公开(公告)号：EP0210215B1
公开(公告)日：1990-03-14
申请号：EP86900809.4
申请日：1986-01-21
申请人： Secretary of State for Defence in Her Britannic Majesty's Gov. of the United Kingdom of Great Britain and Northern Ireland , BDH Chemicals Limited
发明人： BRADSHAW, Madeline, Joan , RAYNES, Edward, Peter , BISHOP, David, Ian , SAGE, Ian, Charles , JENNER, John, Anthony
CPC分类号： C09K19/2021 , C09K19/2007 , C09K19/3068 , C09K19/42 , C09K19/46
摘要： Biphenyl esters of formula (I), wherein formula (II) represents formula (III) or formula (IV), R1 represents C3 - C12 alkyl, alkoxy, alkylcarbonyloxy, alkoxycarbonyl or alkoxycarbonyloxy, j is O or 1, R2 represents C3 - C12 alkyl or alkoxy, one of Q1 or Q2 is fluorine and the other is hydrogen, provided that when j is O and formula (II) is formula (III) and both R1 and R2 are n-alkyl, then the total number of carbon atoms in R1 and R2 is more than 12. These compounds may be used as constituents of liquid crystal mixtures which show a room temperature ferroelectric smectic phase, and a number of such mixtures are described.
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公开(公告)号：EP0406290B1
公开(公告)日：1993-09-15
申请号：EP89904100.8
申请日：1989-03-14
IPC分类号： G02F1/13
CPC分类号： G02F1/132 , G02F1/13737 , G02F1/13781 , G09G3/02
摘要： A colour display formed of information of one colour on a different colour background is projected onto a screen. Light from the bulb is passed serially through a neutral polariser, a smectic liquid crystal cell, and a further polariser. The cell comprises a smectic liquid crystal material incorporating an amount of a cholesteric material and a dye contained between two cell walls carrying electrodes and surface treated to give a molecular twist and alignment to the liquid crystal material. Information is written into the cell by scanning the laser beam over the cell, causing localised heating, in combination with or without an applied electric field to form selected areas with a twisted structure on a background of homeotropic structure, or vice versa. Thus plane polarised light is passed through the cell with its plane selectively rotated or non rotated. This provides a two colour display of information of one colour on a background of the other colour. Alternatively the two coloured polarisers may be replaced by a single neutral or coloured polariser to give a black and white or coloured and white display. The display system may be replicated using differently coloured polarisers and the resulting images combined into a multi colour image on a single screen.
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公开(公告)号：EP0295266B1
公开(公告)日：1993-05-26
申请号：EP87902582.3
申请日：1987-04-01
IPC分类号： G02F1/137
CPC分类号： C09K19/46 , C09K19/126 , C09K19/2021 , C09K19/44 , G02F1/141 , G02F1/1416
摘要： A method, device, and material for providing a fast switching liquid crystal display employs the ferro electric effect of chiral smectic liquid crystal material. To provide a uniform appearance the liquid crystal material is arranged to have a long cholesteric pitch at a temperature close to a smectic/cholesteric phase transition temperature. This long cholesteric pitch allows liquid crystal molecules to cool from the cholesteric to smectic phase with a uniform alignment. The smectic material is contained in a cell between walls (2, 3) bearing electrodes (5, 6) and surface treated to provide homogeneous alignment of liquid crystal material (7).
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