公开(公告)号：JPH05203961A

公开(公告)日：1993-08-13

申请号：JP1302692

申请日：1992-01-28

Applicant: CANON KK

Inventor： HANIYU YUKIO ,  NAKAMURA KATSUTOSHI ,  KODERA YASUHITO ,  MIHARA TADASHI

IPC: G02F1/133 ,  G02F1/1337 ,  G02F1/141

Abstract: PURPOSE:To obtain the liquid crystal element which has the excellent stability of a bistable state, obviates the deviation in threshold value and can prevent seizure by specifying the pretilt angle and tilt angle of a ferroelectric liquid crystal and the angle of half the angle formed by the optical axes of the two stable states to a specific relation. CONSTITUTION:Insulating films 13a, 13b and oriented films 14a, 14b are laminated on substrates 11a, 11b coated with transparent electrodes 12a, 12b. The ferroelectric smectic liquid crystal is disposed between the substrates 11a and 11b. The distance between the substrates 11a and 11b is set small and the ferroelectric smectic liquid crystal 15 generates the bistable orientation state. The ferroelectric liquid crystal has the orientation state expressed by alpha>H if the pretilt angle of the ferroelectric liquid crystal 15 of such constitution is designated as alpha and the tilt angle as H. In addition, the ferroelectric liquid crystal in this oriented state exhibits at least the two stable states and the thetaa which is half the angle formed by these optical axes and the tilt angle H of the ferroelectric liquid crystal has the relation H>thetaa>H/2.

公开(公告)号：JP2003149654A

公开(公告)日：2003-05-21

申请号：JP2001343863

申请日：2001-11-08

Applicant: CANON KK

Inventor： SAITO TETSUO ,  NAKAMURA KATSUTOSHI ,  FURUSAWA TOSHINORI

IPC: G02F1/141 ,  G02F1/1339 ,  G09F9/00

Abstract: PROBLEM TO BE SOLVED: To prevent the leakage of liquid crystal, etc. SOLUTION: A liquid crystal panel P1 in a state where an excessive liquid crystal 3a is stuck to the pouring port of the liquid crystal after pouring the liquid crystal is fixed to a chuck part 23. A pushing member 25 is heated to a temperature of about 90 deg.C by a heater part 20 in advance and a wiping cloth 24 is pushed on the excessive liquid crystal 3a by moving the member 25. After wiping the excessive liquid crystal 3a off with the wiping cloth 24, the pouring port of the liquid crystal is sealed to complete the liquid crystal panel. Since the excessive liquid crystal 3a is heated by the heater part 20 and its viscosity is lowered, the excessive liquid crystal 3a soaks into the wiping cloth 24 and is removed completely from the part of the pouring port of the liquid crystal. As a result, the pouring port of the liquid crystal can properly be sealed and the leakage of the liquid crystal, etc., due to incomplete sealing can be prevented.

公开(公告)号：JPH10197885A

公开(公告)日：1998-07-31

申请号：JP35680596

申请日：1996-12-27

Applicant: CANON KK

Inventor： NAKAMURA KATSUTOSHI ,  OKADA SHINJIRO ,  SUNAGA MAKI ,  KOJIMA MAKOTO ,  MIZUTANI HIDEMASA

IPC: G02F1/1341 ,  B29C39/24 ,  B29K27/12 ,  B29L11/00

Abstract: PROBLEM TO BE SOLVED: To make it possible to rapidly inject liquid crystals even the smectic liquid crystals are used and to obtain good orientation by injecting and cooling the liquid crystals heated to an isotropic phase while specifying the pressures of an aperture for injecting the liquid crystals, an aperture for discharging the excess liquid crystals in a cell and the effective optical modulation region of the cell. SOLUTION: A pair of substrates 11a, 11b are arranged to face each other and are provided with the aperture 3 for injecting the liquid crystals 10 and the aperture 4 for discharging the excess liquid crystals past the inside of the cell 1 in the positions facing each other. These substrates are stuck to each other by a sealing material 2. The stage for packing the liquid crystals 10 into the cell 1 is provided with (a) a period when the liquid crystals heated to the isotropic phase are injected from the aperture 3 in the state of P1 > P2 >=atm. pressure and (b) the period when the liquid crystals attain the isotropic phase and are cooled in the state of holding the liquid crystals until P1 to P3 attain P1 , P3 or above in the period (a) when the pressures of the aperture 3 and the aperture 4 are defined as P1 , P2 and the pressure in the effective optical modulation region 5 of the cell is defined as P3 .

公开(公告)号：JPH09304775A

公开(公告)日：1997-11-28

申请号：JP13774996

申请日：1996-05-09

Applicant: CANON KK

Inventor： MORI YOSHIMASA ,  HANIYU YUKIO ,  SATO KOICHI ,  SHINJO KENJI ,  NAKAMURA SHINICHI ,  YAMADA NOBUTSUGU ,  NOGUCHI KOJI ,  NAKAMURA KATSUTOSHI

IPC: G02F1/1337 ,  C08G73/10

Abstract: PROBLEM TO BE SOLVED: To realize high contrast, high definition, high luminance and a large area by controlling the phase transition of a liquid crystal compsn. between substrates in such a manner that the temp. width in which a mixture state of an isotropic phase and a smectic phase is allowed is controlled to a specified range. SOLUTION: A liquid crystal compsn. is held between a pair of substrates each having an electrode and an orientation controlling layer. At least one of the orientation controlling layers is subjected to uniaxial orientation treatment. The liquid crystal compsn. shows phase transition from an isotropic phase to a smectic phase in this order during the temp. is decreased. The temp. width in which the phase transition of the liquid crystal compsn. between the substrates occurs and a mixture state of both phases is allowed is controlled to 0.1 to 3.5 deg.C. In this case, the ferroelectric liquid crystal element shows bistability in a SmC* phase (chiral smectic C phase) and its orientation state is formed by gradually cooling the liquid crystal from a liquid phase (isotropic phase). By controlling the temp. width to allow a mixture state of phases to 0.1 to 3.5 deg.C, production of defects in orientation can be decreased.

公开(公告)号：JPH08262447A

公开(公告)日：1996-10-11

申请号：JP19954795

申请日：1995-08-04

Applicant: CANON KK

Inventor： KISHI ETSURO ,  NAKAMURA KATSUTOSHI ,  KOJIMA MAKOTO ,  GOFUKU IHACHIROU ,  KANEKO SHUZO

IPC: G02F1/1337

Abstract: PURPOSE: To provide a liq. crystal element having a good liq. crystal oriented state and stabilized optical responsiveness and improved in the asymmetry of switching. CONSTITUTION: A liq. crystal 8 is held between a couple of opposed substrates 1 and 2, the substrate 1 has a uniaxial orientation characteristics, and the substrate 2 has a non-uniaxial orientation characteristics in the liq. crystal element. The absolute value of the difference between the surface potential detected on the surface (interface with liq. crystal) of the substrate 1 having the uniaxial orientation characteristics and the surface potential detected on the surface (interface with liq. crystal) of the substrate 2 having the non-uniaxial orientation characteristics is controlled to

公开(公告)号：JPH0892559A

公开(公告)日：1996-04-09

申请号：JP8940095

申请日：1995-04-14

Applicant: CANON KK

Inventor： SATO KOICHI ,  SHINJO KENJI ,  KITAYAMA HIROYUKI ,  NAKAMURA SHINICHI ,  NAKAMURA KATSUTOSHI

IPC: G02F1/13 ,  C09K19/20 ,  C09K19/28 ,  C09K19/32 ,  C09K19/34 ,  C09K19/42 ,  C09K19/46 ,  C09K19/56

Abstract: PURPOSE: To provide a liquid crystal composition useful as a liquid crystal display element, taking a stable book shelf structure with a small layer inclination angle, having excellent response speed, contrast, luminance, fineness and compatibility of each component, capable of being made into a large area, containing a specific R achiral F-containing liquid crystal compound and an optically active compound. CONSTITUTION: This liquid crystal display composition contains (A) an achiral F-containing liquid crystal compound obtained by bonding a fluorocarbon end part and a hydrocarbon end part to a central nucleus and having a (latent) smectic intermediate phase a compound of formula I [R" is a group of the formula Cx F2x+1 ) ((x) is 1-20) or a group of the formula (Cx ''F2x ''O)z 'Cy 'F2y '+1 (y' is 1-4; z' is 1-3); n is 5-10]} and (B) an optically active compound containing an asymmetric carbon-containing cyclic group and a (perfluorocarbon-free substituent group) alkyl as a side chain e.g. a compound of formula II [R6 is a 1-18C (branched) alkyl; A11 is 1,4-phenylene (substituted with F, etc.) A10 is a single bond or A11 ; X7 is a single bond, COO, etc.; * is optical activity]}.

公开(公告)号：JPH0892558A

公开(公告)日：1996-04-09

申请号：JP8934695

申请日：1995-04-14

Applicant: CANON KK

Inventor： SATO KOICHI ,  NAKAMURA KATSUTOSHI ,  SHINJO KENJI ,  KITAYAMA HIROYUKI ,  NAKAMURA SHINICHI

IPC: G02F1/13 ,  C09K19/12 ,  C09K19/20 ,  C09K19/32 ,  C09K19/34 ,  C09K19/42 ,  C09K19/46 ,  C09K19/56 ,  G02F1/1337

Abstract: PURPOSE: To provide a liquid crystal composition useful as a liquid crystal display element, taking a stable book shelf structure with a small layer inclina tion angle, having excellent contrast, luminance and fineness, capable of being made into a large area, containing a specific achiral F-containing liquid crystal compound and another specific achiral compound. CONSTITUTION: This liquid crystal display composition contains (A) an achiral F-containing liquid crystal compound obtained by bonding an ether oxygen- containing fluorocarbon end part and a hydrocarbon end part to a central nucleus and having a (latent) smectic intermediate phase [a compound of formula I (n is 5-10; x' and z' are 1-3; y' is 1-4) and (B) an achiral compound having a structure which has a core part with a structure of a (substituted) aliphatic ring or a (substituted) aromatic ring, which may contain an atom except C, at the center, in which a (perfluorocarbon-free group-substituted) alkyl is (directly) bonded to one end or both ends of the core part e.g. a compound of formula II [A' is a 1-20C (branched) alkyl; B and B'' are each O or a single bond, etc.; D' is A', etc.; a1 and b1 are each 0-2; a1 +b1 >=1]}.

公开(公告)号：JPH06347797A

公开(公告)日：1994-12-22

申请号：JP15803893

申请日：1993-06-04

Applicant: CANON KK

Inventor： NAKAMURA KATSUTOSHI

IPC: G02F1/1337

Abstract: PURPOSE:To provide a ferroelectric liquid crystal element with which even a ferroelectric liquid crystal without having a cholesteric phase is uniformly orientable. CONSTITUTION:This ferroelectric liquid crystal element has the ferroelectric liquid crystal 16 which make phase transition in order of an isotropic phase, smectic A phase and chiral smectic phase according to lowering of temp. and a pair of substrates 11a, 11b which face each other by holing the ferroelectric liquid crystal 16 in-between and on which electrodes 12a, 12b for impressing voltages to the ferroelectric liquuid crystal 16 respectively are formed on the opposite surfaces thereof. the ferroelectric liquid crystal 16 in the orientation state exhibits at least two stable states. The ferroelectric liquid crystal 16 is subjected to an orientation treatment by applying a temp. gradient thereto in a cell thickness direction at the temp. at which the liquid crystal makes transition to the smectic phase.

公开(公告)号：JPH06202113A

公开(公告)日：1994-07-22

申请号：JP35930992

申请日：1992-12-26

Applicant: CANON KK

Inventor： NAKAMURA KATSUTOSHI ,  HANIYU YUKIO

IPC: G02F1/1337 ,  G02F1/1343 ,  G09G3/36

Abstract: PURPOSE:To reduce the occurrence of nonuniformity in rubbing and to suppress contrast and a driving margin from deterioratiing by performing rubbing processing in parallel with a thin transparent electrode and orthogonally to a thick transparent electrode. CONSTITUTION:Two oppositely disposed glass substrates 2a, 2b are provided, and plural zonal transparent electrodes 3a, 3b are formed on the substrates 3a, 2b. Fo example, a large number of electrodes 3a are provided in a stripe shape while keeping the width of 170mum and the gap of 30mum on the substrate 2a, and a large number of electrode 3b are provided in the strip shape while keeping the width of 100mum and the gap of 100mum on the substrate 2b. The rubbing processing is performed so as to be in parallel with the electrode 3b with thin electrode width, and to be orthogonal to the electrode 3a with thick electrode width. Thereby, it is possible to suppress the occurrence of rubbing nonuniformity due to the difference of abutting of rubbing cloth.

公开(公告)号：JPH06186569A

公开(公告)日：1994-07-08

申请号：JP35478492

申请日：1992-12-17

Applicant: CANON KK

Inventor： NAKAMURA KATSUTOSHI ,  HANIYU YUKIO

IPC: G02F1/133 ,  G02F1/1337

Abstract: PURPOSE:To provide the ferroelectric liquid crystal device which prevents yellowing. CONSTITUTION:This liquid crystal device has a ferroelectric liquid crystal 14 and a pair of substrates 11a, 11b which face each other by holding this ferroelectric liquid crystal 14 in-between, are formed with electrodes for applying voltages to the ferroelectric liquid crystal 14 respectively on the opposite surfaces and are subjected to uniaxial orientation treatments in order to orient the ferroelectric liquid crystal 14. The apparent tilt angle of the liquid crystal device is made larger than in the case of not applying AC by the treatment to apply the AC to the element. The inclination directions of this liquid crystal and at the boundary between the substrates are the same and the pretilt angle is =25nC/cm .