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81. 发明专利

JPS6433526A LIQUID CRYSTAL ELEMENT 失效
公开(公告)号：JPS6433526A
公开(公告)日：1989-02-03
申请号：JP18890687
申请日：1987-07-30
申请人： CANON KK
发明人： TSUBOYAMA AKIRA , INABA YUTAKA , YOSHIDA AKIO , HANIYU YUKIO
IPC分类号： G02F1/1337 , G02F1/133
摘要： PURPOSE:To more smoothly switch a liquid crystal by forming the 1st layer of two insulating layers of a high dielectric material, etc., and forming the 2nd layer of a low resistance dielectric material. CONSTITUTION:Transparent electrodes 2 are formed on substrates 1 of a liquid crystal cell 10 and a vertical shorting preventive layer 3 consisting of the material having a high dielectric constant or ferroelectric material and an orientation control layer 4 consisting of the low resistance dielectric material are formed on at least one transparent electrode 2. The two substrates 1 are so disposed that the electrodes 2 face each other. The ferroelectric liquid crystal FLC 5 is held in place between the substrates. Since the electric capacity of the insulating layers is thereby increased, the sure bistability is imparted to the liquid crystal and the liquid crystal is more smoothly switched.

82. 发明专利

JPS6410214A FERROELECTRIC LIQUID CRYSTAL ELEMENT 失效
公开(公告)号：JPS6410214A
公开(公告)日：1989-01-13
申请号：JP16641687
申请日：1987-07-02
申请人： CANON KK
发明人： YOSHIDA AKIO , UCHIUMI TOSHIHARU , INABA YUTAKA , HANIYU YUKIO , TSUBOYAMA AKIRA
IPC分类号： G02F1/1337 , G02F1/13 , G02F1/133 , G02F1/1333
摘要： PURPOSE:To enable the switching driving of a ferroelectric liquid crystal panel having a particularly large image plane by specifying the capacity of an insulator film and the relations between the capacity and spontaneous polarization of the ferroelectric liquid crystal. CONSTITUTION:The capacity of the insulator film of the ferroelectric liquid crystal element having counter electrodes, the ferroelectric liquid crystal disposed between the electrodes, and the insulator film which is formed on at least either electrode of the counter electrodes and has >=200Angstrom thickness is specified to Ci(nF/cm ) and the capacity and spontaneous polarization of the ferroelectric liquid crystal, respectively designated as CLC(nF/cm ) and PS(nC/cm ), are so specified as to have the relations Ci(nF/cm ) >=2.PS(nC/cm )-CLC(nF/cm ), more preferably Ci(nF/cm )>=7. PS(nC/cm )-CLC(nF/cm ). The practicable use of the large-area display panel is thereby enabled.

83. 发明专利

JPS63197920A DRIVING METHOD FOR OPTICAL MODULATION ELEMENT 失效
公开(公告)号：JPS63197920A
公开(公告)日：1988-08-16
申请号：JP3107287
申请日：1987-02-12
申请人： CANON KK
发明人： TSUBOYAMA AKIRA
IPC分类号： G02F1/05 , G02F1/133 , G09G3/36
摘要： PURPOSE:To enlarge a driving voltage margin by providing a period for applying voltage zero or a voltage the same in polarity as a write voltage, immediately before applying the write voltage to be applied to a picture element on a selected scanning electrode. CONSTITUTION:Between a scanning electrode group and an information electrode group which are being intersected, an optical modulating substance is provided, and in accordance with the electric field direction of a voltage applied to an intersection part which are used as a picture element, the contrast is identified. Immediately before applying a write voltage to be applied to the picture element on the selected scanning electrode, a period for applying voltage zero or a voltage the same in polarity as the write voltage is provided. For instance, by providing a prescribed pausing period T between an opposite polarity pre-pulse Vb and a write pulse Vw, the influence of the opposite polarity pre-pulse Vb at the time of writing can be reduced. In such a way, a normal display can be executed, and a driving voltage margin can be enlarged.

84. 发明专利

JPS63129324A DRIVING METHOD FOR FERROELECTRIC LIQUID CRYSTAL ELEMENT 失效
公开(公告)号：JPS63129324A
公开(公告)日：1988-06-01
申请号：JP27543086
申请日：1986-11-20
申请人： CANON KK
发明人： TSUBOYAMA AKIRA
IPC分类号： G09G3/18 , G02F1/133
摘要： PURPOSE:To maintain bistability by applying a switching pulse signal below a DC voltage in such a direction that an internal electric field produced in a liquid crystal layer owing to the maldistribution of an ion material is canceled. CONSTITUTION:A liquid crystal element which has spontaneous polarization originating from a molecule dipole and uses bistable ferroelectric liquid crystal allows ion species in the liquid crystal to migrate in with the internal electric field established by the spontaneous polarization. When an electric field E is applied to the element, liquid crystal molecules 3 are oriented in the 1st orientation state 5, but this state is stable even after the electric field is ceased. Further, when an electric field E' in the opposite direction is applied, the liquid crystal molecules 3 are oriented in the 2nd orientation state 5' and change in direction, and are held in the state even after the electric field is ceased. Those orientation states are maintained on condition that the electric field E does not exceeds a constant threshold value. Consequently, the bistability of the orientation of the liquid crystal molecules is maintained.

85. 发明专利

JPS63101481A LIQUID CRYSTAL COMPOSITION AND LIQUID CRYSTAL ELEMENT OBTAINED BY USING SAME 失效
公开(公告)号：JPS63101481A
公开(公告)日：1988-05-06
申请号：JP24675986
申请日：1986-10-16
申请人： CANON KK
发明人： SHINJO KENJI , YOSHIDA AKIO , UCHIUMI TOSHIHARU , TSUBOYAMA AKIRA , FUTAMI SACHIKO
IPC分类号： C09K19/42 , C09K19/46 , C09K19/48 , G02F1/13
摘要： PURPOSE:To provide a liquid crystal compsn. which has excellent working characteristics at low temp., initial orientation, high-speed response, etc., by mixing two compds. having an optically active group and causing different phase transition from an isotropic phase in the course of temp drop. CONSTITUTION:A compd. (A) having an optically active group and causing phase transition from an isotropic phase to a smectic A phase and from a smectic C phase to a phase having a higher degree of order in the course of temp. drop is mixed with a compd. (B) having an optically active group and causing phase transition from an isotropic phase to a chiral smectic phase in the course of temp. drop to obtain the desired liquid crystal compsn. Examples of the component A are compds. of formulas I, II, etc. Examples of the component B are compds. of formulas III, IV, etc. In this way, the temp. range of the smectic A phase for improving orientation can be widened and the temp. range of the chiral smectic phase can be widened toward a low- temperature zone.

86. 发明专利

JPS62275223A LIQUID CRYSTAL ELEMENT AND ITS DRIVING METHOD 失效
公开(公告)号：JPS62275223A
公开(公告)日：1987-11-30
申请号：JP11742286
申请日：1986-05-23
申请人： CANON KK
发明人： TSUBOYAMA AKIRA , OKADA SHINJIRO , TANIGUCHI OSAMU , KAWAGISHI HIDEYUKI
IPC分类号： G02F1/1337 , G02F1/133
摘要： PURPOSE:To obtain a liquid crystal element which displays characteristics of ferroelectric liquid crystal to its maximum by obtaining a certain specified bistable state. CONSTITUTION:This a liquid crystal element of cell structure having the ferroelectric liquid crystal between a couple of substrates provided with electrodes and oriented films and the ferroelectric liquid crystal has a single stable state induced on an oriented film interface in the absence of an impressed electric field. Then, when a DC electric field (downward) is impressed on the liquid crystal element which is in a stable molecule orientation state in one direction so that the polarization direction of liquid crystal molecules becomes stable in the opposite direction, a bistable state can be realized artificially. Namely, the DC electric field in this opposite direction is impressed while the liquid crystal element is driven to generate a state where an electric field more than a certain value is impressed at any time, thereby obtaining the stable bistable state regardless of the phase structure of the liquid crystal, components of the oriented films, a combination of orientation processing methods, etc.

87. 发明专利

JPS62231937A LIQUID CRYSTAL ELEMENT 失效
公开(公告)号：JPS62231937A
公开(公告)日：1987-10-12
申请号：JP7257486
申请日：1986-04-01
申请人： CANON KK
发明人： KITAYAMA HIROYUKI , KATAGIRI KAZUHARU , YOSHINAGA KAZUO , TSUBOYAMA AKIRA , SHINJO KENJI
IPC分类号： C08G73/10 , G02F1/1337
摘要： PURPOSE:To obtain the titled element having an improved transmittance at the time of opening a picture element shutter by mounting a coating film composed of a high polymer having a specific structural unit which orientates preferentially plural layers in one direction on at least one substrate of a pair of substrates. CONSTITUTION:The titled element comprises the pair of the upper substrate 11a and the lower substrate 11b which are disposed in parallel and transparent electrodes 12a, 12b which are wired to each substrates. The orientation controlling films 14a, 14b composed of the film of the high polymer shown by formula I are disposed on the substrates 11a and 11b respectively. In formula I, R is a bivalent group shown by formula II. In order to mount the polyimido type high polymer film having the structural unit on the substrate 1, polyamic acid is dissolved in N-methylpyrrolidone (NMP), dimethylformamide (DMF) and dimethylacetoamide (DMAC), etc., and the obtd. solution is coated on the substrate, and subsequently, the substrate is thermally treated, thereby dehydrating and ring closuring it to form an imido binding.

88. 发明专利

JPS62134691A LIQUID CRYSTAL UNIT 失效
公开(公告)号：JPS62134691A
公开(公告)日：1987-06-17
申请号：JP27432885
申请日：1985-12-07
申请人： CANON KK
发明人： TANIGUCHI OSAMU , KAWAGISHI HIDEYUKI , TSUBOYAMA AKIRA
IPC分类号： G09G3/36 , G02F1/133 , G02F1/137 , G02F1/141 , G09F9/35

89. 发明专利

JPS62133426A LIQUID CRYSTAL DEVICE 失效
公开(公告)号：JPS62133426A
公开(公告)日：1987-06-16
申请号：JP27340885
申请日：1985-12-06
申请人： CANON KK
发明人： TANIGUCHI OSAMU , OKADA SHINJIRO , KAWAGISHI HIDEYUKI , TSUBOYAMA AKIRA
IPC分类号： G09G3/36 , G02F1/133 , G02F1/137 , G02F1/141 , G09G3/18
摘要： PURPOSE:To stabilize the parallel state of liquid crystal molecules and to obtain a liquid crystal device having fine characteristics improving its contrast and reducing flickering by impressing an AC voltage to all picture elements prior to the impression of a display signal based upon multiplexing driving. CONSTITUTION:When a main switch is turned on, a parallel orientation AC voltage having peak values VS', V1' and pulse width DELTAT' is impressed to all scanning electrodes and information signal electrodes with the reverse phase by a driving voltage control circuit 10b. Thereby, a square AC voltage of VPP= VS'+V1'identicalVAC (the voltage between peaks is VAC) is impressed between upper and lower substrates. After impressing the AC voltage for a prescribed time and making the liquid crystal molecules parallel state, a display signal driving voltage, i.e. a pulse voltage having voltage peak values of 3V0, -2V0 on the scanning signal side and + or -V0 on the information signal side and the pulse width of DELTAT, is set up as a write pulse by a driving voltage control circuit 10b and multiplexing driving is started in accordance with an input signal to an interface 11.

90. 发明专利

JPS61269123A LIQUID CRYSTAL ELEMENT 失效
公开(公告)号：JPS61269123A
公开(公告)日：1986-11-28
申请号：JP11020585
申请日：1985-05-24
申请人： CANON KK
发明人： TSUBOYAMA AKIRA
IPC分类号： G02F1/133 , G02F1/1337 , G02F1/141
摘要： PURPOSE:To obtain a liquid crystal element which can attain two stable orientation states even while an electric field is not impressed thereto by subjecting both substrate surfaces to the same surface treatment to realize through bistability. CONSTITUTION:This liquid crystal element is constituted by forming transparent electrodes on the surfaces of the substrates then forming protective layers over the entire part of the substrates and forming further plural spacers on the protective layers. Two sheets of the substrates of which both surfaces in contact with a ferroelectric liquid crystal are subjected to the same surface treatment are used. The liquid crystal element is formed of two sheets of the substrates subjected to exactly the same surface treatment and the liquid crystal layer is made vertically symmetrical, by which the approximately through bistability of the liquid crystal is realized. The liquid crystal element having the two states of the liquid crystal orientation stable even in the non-impression stage of the electric field is obtd.

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