公开(公告)号：CA2088934C

公开(公告)日：2003-06-03

申请号：CA2088934

申请日：1993-02-08

Applicant: DISPLAYTECH INC ,  HOECHST AG

Inventor： WAND MICHAEL D ,  HANDSCHY MARK A ,  ESCHER CLAUS ,  VOHRA ROHINI T

IPC: C07C69/92 ,  C07D213/30 ,  C07D213/64 ,  C07D213/65 ,  C07D239/26 ,  C07D239/34 ,  C07D239/38 ,  C07D303/24 ,  C07D405/12 ,  C09K19/02 ,  C09K19/04 ,  C09K19/12 ,  C09K19/20 ,  C09K19/34 ,  C09K19/54 ,  C09K19/58 ,  G02F1/13 ,  G02F1/1337 ,  G02F1/141 ,  G02F1/135

Abstract: High-contrast electro-optic device contain non-surface stabilized FLC cells which retain a helical diameter (~) structure and exhibit a change in optical anisotropy as a function of the magnitude of an applied electric field or driving voltage. The FLC cells incorporate chiral ferroelectric liquid crystals which exhibit a ferroelectric phase and a chiral nematic (N*) phase at temperatures above the ferroelectric phase and comprise uniformly spaced electrode-containing plates between which the FLC is aligned. The cell is provided with means for detecting the change in optical anisotropy in the FLC induced by the application of the electric field.

公开(公告)号：SE9300375L

公开(公告)日：1993-08-08

申请号：SE9300375

申请日：1993-02-05

Applicant: DISPLAYTECH INC ,  HOECHST AG

Inventor： WAND MICHAEL D ,  HANDSCHY MARK ,  ESCHER CLAUS ,  VOHRA ROHINI

IPC: C07C69/92 ,  C07D213/30 ,  C07D213/64 ,  C07D213/65 ,  C07D239/26 ,  C07D239/34 ,  C07D239/38 ,  C07D303/24 ,  C07D405/12 ,  C09K19/02 ,  C09K19/04 ,  C09K19/12 ,  C09K19/20 ,  C09K19/34 ,  C09K19/54 ,  C09K19/58 ,  G02F1/13 ,  G02F1/1337 ,  G02F1/141

Abstract: Ferroelectric Liquid Crystals (FLCs) which exhibit a ferroelectric phase and a chiral nematic phase at temperatures above the ferroelectric phase are provided. The natural helix pitch of the FLC in the ferroelectric phase of these materials is sufficiently tighter than the thickness of the FLC layer such that it is not surface-stabilized. The chiral nematic phase has a natural helix pitch sufficiently greater than the cell thickness to facilitate alignment of the FLC in an FLC device to achieve high contrast. The FLCs of this invention are useful in making fast response, high contrast FLC electro-optic devices in which the FLC retains a helical director structure stable to unwinding.

公开(公告)号：GB9301786D0

公开(公告)日：1993-03-17

申请号：GB9301786

申请日：1993-01-29

Applicant: DISPLAYTECH INC ,  HOECHST AG

IPC: C07C69/92 ,  C07D213/30 ,  C07D213/64 ,  C07D213/65 ,  C07D239/26 ,  C07D239/34 ,  C07D239/38 ,  C07D303/24 ,  C07D405/12 ,  C09K19/02 ,  C09K19/04 ,  C09K19/12 ,  C09K19/20 ,  C09K19/34 ,  C09K19/54 ,  C09K19/58 ,  G02F1/13 ,  G02F1/1337 ,  G02F1/141

Abstract: Ferroelectric Liquid Crystals (FLCs) which exhibit a ferroelectric phase and a chiral nematic phase at temperatures above the ferroelectric phase are provided. The natural helix pitch of the FLC in the ferroelectric phase of these materials is sufficiently tighter than the thickness of the FLC layer such that it is not surface-stabilized. The chiral nematic phase has a natural helix pitch sufficiently greater than the cell thickness to facilitate alignment of the FLC in an FLC device to achieve high contrast. The FLCs of this invention are useful in making fast response, high contrast FLC electro-optic devices in which the FLC retains a helical director structure stable to unwinding.

公开(公告)号：SE9300375D0

公开(公告)日：1993-02-05

申请号：SE9300375

申请日：1993-02-05

Applicant: DISPLAYTECH INC ,  HOECHST AG

Inventor： WAND MICHAEL D ,  HANDSCHY MARK ,  ESCHER CLAUS ,  VOHRA ROHINI

IPC: C07C69/92 ,  C07D213/30 ,  C07D213/64 ,  C07D213/65 ,  C07D239/26 ,  C07D239/34 ,  C07D239/38 ,  C07D303/24 ,  C07D405/12 ,  C09K19/02 ,  C09K19/04 ,  C09K19/12 ,  C09K19/20 ,  C09K19/34 ,  C09K19/54 ,  C09K19/58 ,  G02F1/13 ,  G02F1/1337 ,  G02F1/141

Abstract: Ferroelectric Liquid Crystals (FLCs) which exhibit a ferroelectric phase and a chiral nematic phase at temperatures above the ferroelectric phase are provided. The natural helix pitch of the FLC in the ferroelectric phase of these materials is sufficiently tighter than the thickness of the FLC layer such that it is not surface-stabilized. The chiral nematic phase has a natural helix pitch sufficiently greater than the cell thickness to facilitate alignment of the FLC in an FLC device to achieve high contrast. The FLCs of this invention are useful in making fast response, high contrast FLC electro-optic devices in which the FLC retains a helical director structure stable to unwinding.

公开(公告)号：DE4303335B4

公开(公告)日：2005-11-10

申请号：DE4303335

申请日：1993-02-05

Applicant: DISPLAYTECH INC ,  HOECHST AG

Inventor： WAND MICHAEL D ,  HANDSCHY MARK ,  VOHRA ROHINI ,  ESCHER CLAUS

IPC: C07C69/92 ,  C07D213/30 ,  C07D213/64 ,  C07D213/65 ,  C07D239/26 ,  C07D239/34 ,  C07D239/38 ,  C07D303/24 ,  C07D405/12 ,  C09K19/02 ,  C09K19/04 ,  C09K19/12 ,  C09K19/20 ,  C09K19/34 ,  C09K19/54 ,  C09K19/58 ,  G02F1/13 ,  G02F1/1337 ,  G02F1/141 ,  C09K19/40 ,  G02F1/1333 ,  G02F1/137 ,  G09F9/35

Abstract: Ferroelectric Liquid Crystals (FLCs) which exhibit a ferroelectric phase and a chiral nematic phase at temperatures above the ferroelectric phase are provided. The natural helix pitch of the FLC in the ferroelectric phase of these materials is sufficiently tighter than the thickness of the FLC layer such that it is not surface-stabilized. The chiral nematic phase has a natural helix pitch sufficiently greater than the cell thickness to facilitate alignment of the FLC in an FLC device to achieve high contrast. The FLCs of this invention are useful in making fast response, high contrast FLC electro-optic devices in which the FLC retains a helical director structure stable to unwinding.

公开(公告)号：DE69109680T2

公开(公告)日：1995-10-12

申请号：DE69109680

申请日：1991-07-22

Applicant: DISPLAYTECH INC

Inventor： WAND MICHAEL ,  THURMES WILLIAM ,  WALBA DAVID

IPC: C07C43/225 ,  C07C69/76 ,  C07C69/773 ,  C07C69/92 ,  C07D213/30 ,  C07D237/08 ,  C07D239/26 ,  C07D285/12 ,  C09K19/04 ,  C09K19/12 ,  C09K19/20 ,  C09K19/34 ,  C09K19/58 ,  G02F1/13

Abstract: The subject application discloses a chiral nonracemic composition of the general formula: R1-Ar-O-CH2-C*HX-C*HY-CH2-O-R2 wherein R1 is an achiral tail of two to sixteen carbons; Ar is an achiral FLC core of at least two rings; * denotes a chiral carbon; X and Y are halogens; and R2 is one to ten carbon atoms. The -O-CH2-C*HX-C*HY-CH2-O- segment comprises the chiral proximal segment of the chiral tail; the proximal segment is selected from the enantiomers 2R,3R-dihalo and 2S,3S-dihalo. R2 is the distal segment of the chiral tail.

公开(公告)号：CA1299721C

公开(公告)日：1992-04-28

申请号：CA580187

申请日：1988-10-14

Applicant: DISPLAYTECH INC

Inventor： HANDSCHY MARK A ,  CLARK NOEL A

IPC: G02F1/133 ,  G02F1/1333 ,  G02F1/141 ,  G02F1/31 ,  G02F1/315 ,  G09G3/18

Abstract: ELECTRO-OPTIC SWITCHING DEVICES USING FERROELECTRIC LIQUID CRYSTALS An electro-optic switching device using ferroelectric liquid crystals to either transmit or reflect the incident light depending upon the molecular orientation of the ferroelectric liquid crystal molecules. An applied voltage causes the ferroelectric molecules to switch from a first state in which the incident light is substantially transmitted to a state in which the incident light is substantially reflected. This is accomplished by effectively changing the refractive index of the ferroelectric liquid crystal in the different states. The ferroelectric liquid crystal is disposed between two dielectric mediums such as glass so as to define a boundary which either causes incident light to change direction or its complex amplitude to change, and the smectic layers of the ferroelectric liquid crystals are oriented such that the incident light is selectively switched to one or more outputs. The molecules are also oriented so as to rotate in a plane perpendicular to the applied field, thereby reducing the switching time between the first and second molecular orientations. In addition, the switching effect may be made operative solely by the presence or absence of light by generating the applied electric field from the incident light.

公开(公告)号：SE515705C2

公开(公告)日：2001-09-24

申请号：SE9300375

申请日：1993-02-05

Applicant: DISPLAYTECH INC ,  HOECHST AG

Inventor： WAND MICHAEL D ,  HANDSCHY MARK ,  ESCHER CLAUS ,  VOHRA ROHINI

IPC: C07C69/92 ,  C07D213/30 ,  C07D213/64 ,  C07D213/65 ,  C07D239/26 ,  C07D239/34 ,  C07D239/38 ,  C07D303/24 ,  C07D405/12 ,  C09K19/02 ,  C09K19/04 ,  C09K19/12 ,  C09K19/20 ,  C09K19/34 ,  C09K19/54 ,  C09K19/58 ,  G02F1/13 ,  G02F1/1337 ,  G02F1/141

Abstract: Ferroelectric Liquid Crystals (FLCs) which exhibit a ferroelectric phase and a chiral nematic phase at temperatures above the ferroelectric phase are provided. The natural helix pitch of the FLC in the ferroelectric phase of these materials is sufficiently tighter than the thickness of the FLC layer such that it is not surface-stabilized. The chiral nematic phase has a natural helix pitch sufficiently greater than the cell thickness to facilitate alignment of the FLC in an FLC device to achieve high contrast. The FLCs of this invention are useful in making fast response, high contrast FLC electro-optic devices in which the FLC retains a helical director structure stable to unwinding.

公开(公告)号：CA2321252A1

公开(公告)日：1999-08-26

申请号：CA2321252

申请日：1999-02-17

Applicant: DISPLAYTECH INC

Inventor： HANDSCHY MARK A ,  MEADOWS MICHAEL R ,  CRANDALL CHARLES M ,  SISSOM BRADLEY J

IPC: G02F1/137 ,  C09K19/02 ,  G02F1/1335 ,  G02F1/13357 ,  G02F1/13363 ,  G02F1/1347 ,  G02F1/135 ,  G02F1/141

Abstract: A display system (400) for acting on light entering the system includes a reflective ferroelectric liquid crystal spatial light modulator (402) and a polarizer arrangement. The polarizer arrangement includes a polarizer (405) for polarizing the light entering the system and directing the polarized light into the spatial light modulator (SLM) along an optical path having an optical path axis, an analyser (406) configured to receive and analyze the optical output of the SLM (402) and to direct the analyzed optical output out of the system, a compensator (404) between the polarizer (405) and the SLM (402) and in the optical path between the SLM (402) and the analyzer (406) and a passive wave plate (408) in the optical path between the light source (410) and the SLM and in the optical path between the SLM and the viewing area. The compensator includes a layer of ferroelectric liquid crystal light modulating medium switchable between a first compensator state and a second compensator state.

公开(公告)号：CA2087592A1

公开(公告)日：1992-01-21

申请号：CA2087592

申请日：1991-07-22

Applicant: DISPLAYTECH INC

Inventor： WAND MICHAEL D ,  THURMES WILLIAM N ,  WALBA DAVID M

IPC: C07C43/225 ,  C07C69/76 ,  C07C69/773 ,  C07C69/92 ,  C07D213/30 ,  C07D237/08 ,  C07D239/26 ,  C07D285/12 ,  C09K19/04 ,  C09K19/12 ,  C09K19/20 ,  C09K19/34 ,  C09K19/58 ,  C09K19/10 ,  C07D405/12 ,  C07D213/24

Abstract: The subject application discloses a chiral nonracemic composition of the general formula: R1-Ar-O-CH2-C*HX-C*HY- CH2-O-R2, wherein R1 is a tail group of two to sixteen carbons; Ar is an achiral FLC core of at least two rings; * denotes a chiral carbon; X and Y are halogens ; and R2 is one to ten carbon atoms. The - O-CH2-C*HX-C*HY-CH2-O- segment com- prises the chiral proximal segment of the chiral tail; the proximal segment is selected from the enantiomers 2R,3R-dihalo and 2S;3S-dihalo R2 is the distal segment of the chiral tail.