公开(公告)号：EP2547749B1

公开(公告)日：2014-06-11

申请号：EP11718175.0

申请日：2011-03-15

申请人： Dow Corning Corporation ,  Cambridge Enterprise Limited

发明人： CLAPP, Terry, Victor ,  CROSSLAND, William, Alden ,  DAVEY, Anthony, Bemard ,  GRASSMAN, Martin ,  HANNINGTON, Jonathan, Paul ,  KING, Russell, Keith ,  PIVNENKO, Mike ,  ROBSON, Steven ,  XU, Huan

IPC分类号： C09K19/40 ,  C09K19/42 ,  C09K19/54 ,  C09K19/52 ,  C09K19/58 ,  C09K19/60 ,  C09K19/04 ,  G02F1/137

CPC分类号： C09K19/60 ,  C09K19/406 ,  C09K19/408 ,  C09K19/42 ,  C09K19/52 ,  C09K19/54 ,  C09K19/58 ,  C09K2019/0444 ,  G02F1/13781

公开(公告)号：EP2547749A1

公开(公告)日：2013-01-23

申请号：EP11718175.0

申请日：2011-03-15

申请人： Dow Corning Corporation ,  Cambridge Enterprise Limited

发明人： CLAPP, Terry, Victor ,  CROSSLAND, William, Alden ,  DAVEY, Anthony, Bemard ,  GRASSMAN, Martin ,  HANNINGTON, Jonathan, Paul ,  KING, Russell, Keith ,  PIVNENKO, Mike ,  ROBSON, Steven ,  XU, Huan

IPC分类号： C09K19/40 ,  C09K19/42 ,  C09K19/54 ,  C09K19/52

CPC分类号： C09K19/60 ,  C09K19/406 ,  C09K19/408 ,  C09K19/42 ,  C09K19/52 ,  C09K19/54 ,  C09K19/58 ,  C09K2019/0444 ,  G02F1/13781

摘要： The present, invention relates to liquid crystal compositions having a smectic A structure for use in an optical device in which the composition is sandwiched between a pair of electrodes (12-15). In essence the composition includes a siloxane oligomer (component (a)) which may be seen to construct a layered SmA system of particular spacing and "strength". Within this structure a low molar mass nematic mesogen (component (c)) is provided that may be considered to be that of a "plasticiser" which moderates the layer "strength", while simultaneously providing tuneability to the properties of the composition, e.g. its refractive index or dielectric anisotropy. The addition of a side chain liquid crystal polysiloxane (component (d)) allows such systems to be further moderated since they can be considered as binding together the la>¾rs, both within a given layer and between layers. An ionic dopant (component (b)) is also included in the composition that migrates through the composition when low frequency electric fields are applied to the composition by the electrodes, thereby disrupting the order to the composition. Order in the composition can be restored by applying a higher frequency field that does not allow the dopant time to migrate significantly. Chromophores may also be included in the formulation.

公开(公告)号：EP2217680B1

公开(公告)日：2011-11-30

申请号：EP07854443.4

申请日：2007-10-26

申请人： Dow Corning Corporation ,  Cambridge Enterprise Limited

发明人： HANNINGTON, Jonathan, Paul ,  CLAPP, Terry, Victor ,  NISHIDA, Fumito ,  KING, Russell, Keith ,  FAROOQ, Omar ,  GRASMANN, Martin ,  CROSSLAND, William, Alden ,  COLES, Harry, James ,  DAVEY, Anthony, Bernard ,  XU, Huan ,  HADELER, Oliver ,  PIVNENKO, Mykhaylo

IPC分类号： C09K19/40

CPC分类号： C09K19/406 ,  Y10T428/10

摘要： A liquid crystal formulation is described. The liquid crystal formulation comprises a first oligosiloxane-modified nano-phase segregating liquid crystalline material; and at least one additional material selected from a second oligosiloxane- modified nano-phase segregating liquid crystalline material, non-liquid crystalline oligosiloxane-modified materials, organic liquid crystalline materials, or non-liquid crystalline materials, wherein the liquid crystal formulation has an I→ SmA*→ SmC* phase transition, with a SmC* temperature range from about 15°C to about 35°C, a tilt angle of about 22.5° ± 6° or about 45° ± 6°, a spontaneous polarization of less than about 50 nC/cm2., and a rotational viscosity of less than about 600 cP. Devices containing liquid crystal formulations are also described. The device has a stable bookshelf geometry, bistable switching, and isothermal electric field alignment, a response time of less than 500 μs when switched between two stable states, and an electric drive field of less than about 30 V/ μm.

公开(公告)号：EP2217680A1

公开(公告)日：2010-08-18

申请号：EP07854443.4

申请日：2007-10-26

申请人： Dow Corning Corporation ,  Cambridge Enterprise Limited

发明人： HANNINGTON, Jonathan, Paul ,  CLAPP, Terry, Victor ,  NISHIDA, Fumito ,  KING, Russell, Keith ,  FAROOQ, Omar ,  GRASMANN, Martin ,  CROSSLAND, William, Alden ,  COLES, Harry, James ,  DAVEY, Anthony, Bernard ,  XU, Huan ,  HADELER, Oliver ,  PIVNENKO, Mykhaylo

IPC分类号： C09K19/40

CPC分类号： C09K19/406 ,  Y10T428/10

摘要： A liquid crystal formulation is described. The liquid crystal formulation comprises a first oligosiloxane-modified nano-phase segregating liquid crystalline material; and at least one additional material selected from a second oligosiloxane- modified nano-phase segregating liquid crystalline material, non-liquid crystalline oligosiloxane-modified materials, organic liquid crystalline materials, or non-liquid crystalline materials, wherein the liquid crystal formulation has an I→ SmA*→ SmC* phase transition, with a SmC* temperature range from about 15°C to about 35°C, a tilt angle of about 22.5° ± 6° or about 45° ± 6°, a spontaneous polarization of less than about 50 nC/cm2., and a rotational viscosity of less than about 600 cP. Devices containing liquid crystal formulations are also described. The device has a stable bookshelf geometry, bistable switching, and isothermal electric field alignment, a response time of less than 500 μs when switched between two stable states, and an electric drive field of less than about 30 V/ μm.

公开(公告)号：EP2663612A1

公开(公告)日：2013-11-20

申请号：EP12700720.1

申请日：2012-01-09

申请人： Cambridge Enterprise Limited

发明人： CHU, Daping ,  XU, Huan ,  CROSSLAND, William, Alden ,  DAVEY, Anthony, Bernard

IPC分类号： C09K19/02 ,  C09K19/58 ,  C09K19/52 ,  C09K19/40

CPC分类号： G02F1/1333 ,  C09K19/02 ,  C09K19/408 ,  C09K19/52 ,  C09K19/582

摘要： A liquid crystal smectic A composition that can be switched by the application of different electric fields across it between a first stable state (left hand block in Fig 4) and at least one second stable state (right hand block in Fig 4) in which the composition is less ordered than in the first state. The radiation transmission properties of the first and second states are different. The composition comprises: (A) a liquid crystal material that has a positive dielectric anisotropy and that is a uniformly aligned smectic A structure when in the first state; (B) an ionic dopant giving a negative conductivity anisotropy in the liquid crystal material so that it is capable of disrupting the smectic A structure of the first state when subject to an electric field that causes the dopant to migrate through the composition, thereby causing the composition to switch into said at least one second state, and (C) optically anisotropic pigment particles having positive dielectric anisotropy dispersed in the composition, the largest dimension of the pigment particles being in the range of 10nm to 1 µm. The composition, when in the first relatively stable state, is capable of undergoing smectic dynamic scattering due to electro-hydrodynamic instability under the influence of a sufficiently low frequency AC field, thereby disordering the liquid crystals and the pigment particles and thereby discouraging the pigment particles from aggregating together. The composition is suitable for use in displays and is especially resistant to degradation by ambient light and so can be used in outside applications.

公开(公告)号：EP2024792A1

公开(公告)日：2009-02-18

申请号：EP07724898.7

申请日：2007-05-04

申请人： Cambridge Enterprise Limited

发明人： CHRISTMAS, Jamieson ,  CROSSLAND, William, Alden

IPC分类号： G03H1/08 ,  G03H1/22

CPC分类号： G03H1/2294 ,  G03H1/0808 ,  G03H2001/0816 ,  G03H2001/085 ,  G03H2001/2218 ,  G03H2210/441 ,  G03H2225/32

摘要： A method of retrieving phase information (309) from input intensity information (362), representative of a target image, in which a Fourier transform (350) is performed on data (301, 303), and the result (305) used in forming a phase estimate (309), the phase estimate being inverse Fourier transformed (356), thereby producing magnitude (311) and phase (313) replay, and wherein not only is the phase reply component (313) but also data derived from the magnitude replay component (311), iteratively fed back.

公开(公告)号：EP2024792B1

公开(公告)日：2015-04-22

申请号：EP07724898.7

申请日：2007-05-04

申请人： Cambridge Enterprise Limited

发明人： CHRISTMAS, Jamieson ,  CROSSLAND, William, Alden

IPC分类号： G03H1/08

CPC分类号： G03H1/2294 ,  G03H1/0808 ,  G03H2001/0816 ,  G03H2001/085 ,  G03H2001/2218 ,  G03H2210/441 ,  G03H2225/32

公开(公告)号：EP1800182A2

公开(公告)日：2007-06-27

申请号：EP05787176.6

申请日：2005-09-27

申请人： Cambridge Enterprise Limited ,  Advex Corporation Limited

发明人： CROSSLAND, William, Alden ,  DAVEY, Anthony, Bernard ,  SUN, Gang ,  DIXON, Alan, Colin

IPC分类号： G02F1/1347

CPC分类号： G02F1/1347 ,  G02F1/133514 ,  G02F1/133553 ,  G02F1/13475 ,  G02F1/13476 ,  G02F1/1391 ,  G02F2203/34

摘要： A liquid crystal structure (200) comprising first and second reflective regions (214a, 214b, 214c) arranged to reflect respective first and second colours. The first and second reflective regions (214a, 214b, 214c) are disposed transversely to the direction of reflection (R). Each region includes a reflective back area and a selector (210) controllable to control light reflected from the region. Furthermore, a controllable reflector (212) is superposed over the reflective region in the direction of reflection (R) and controllable to transmit or scatter incident light.

公开(公告)号：EP2663612B1

公开(公告)日：2014-10-22

申请号：EP12700720.1

申请日：2012-01-09

申请人： Cambridge Enterprise Limited

发明人： CHU, Daping ,  XU, Huan ,  CROSSLAND, William, Alden ,  DAVEY, Anthony, Bernard

IPC分类号： C09K19/02 ,  C09K19/58 ,  C09K19/52 ,  C09K19/40 ,  G02F1/1333

CPC分类号： G02F1/1333 ,  C09K19/02 ,  C09K19/408 ,  C09K19/52 ,  C09K19/582

公开(公告)号：EP2215188B1

公开(公告)日：2012-04-04

申请号：EP07844446.0

申请日：2007-10-19

申请人： Dow Corning Corporation ,  Cambridge Enterprise Ltd.

发明人： HANNINGTON, Jonathan, Paul ,  CLAPP, Terry, Victor ,  NISHIDA, Fumito ,  KING, Russell, Keith ,  FAROOQ, Omar ,  GRASMANN, Martin ,  CROSSLAND, William, Alden ,  COLES, Harry, James ,  DAVEY, Anthony, Bernard ,  XU, Huan ,  HADELER, Oliver ,  PIVNENKO, Mykhaylo

IPC分类号： C09K19/40

CPC分类号： C09K19/406 ,  Y10T428/1014

摘要： A liquid crystal formulation is described. The liquid crystal formulation comprises a first oligosiloxane-modified nano-phase segregating liquid crystalline material; and at least one additional material selected from a second oligosiloxane- modified nano-phase segregating liquid crystalline material, non-liquid crystalline oligosiloxane-modified materials, organic liquid crystalline materials, or organic non- liquid crystalline materials, wherein the liquid crystal formulation is nano-phase segregated in the SmC* phase, has an I→SmC* phase transition, with a SmC* temperature range from about 15°C to about 35°C, has a tilt angle of about 22.5° ± 6° or about 45° ± 6°, and has a spontaneous polarization of less than about 50 nC/cm2, and a rotational viscosity of less than about 600 cP. Devices containing liquid crystal formulations are also described. The device has a stable bookshelf geometry, bistable switching, and isothermal electric field alignment, a response time of less than 500 μs when switched between two stable states, and an electric drive field of less than about 30 V/ μm.