EP0169518A2
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EP
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Liquid crystal apparatus
Assignee: Casio Computer Co Ltd
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Filing: 1985-07-22
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Granted: —
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Expires: 2005-07-22
Abstract
Abstract A liquid crystal apparatus according to the invention has first and second substrates (57, 59) opposing each other. Segment electrodes (SE1, SE2) are formed on the inner surface of the first substrate (57). Common electrodes (CE1, CE2) are formed on the inner surface of the second substrate (59). Seal members (61, 63) seal a liquid crystal composition (77) in a predetermined region between the segment electrodes (SE1, SE2) and the comon electrodes (CE1, CE2). Light shutters are formed by these electrodes (CE1, CE2, SE1, SE2) and the liquid crystal composition (77) sealed therebetween. In order to reduce influence of a hysteresis effect of the liquid crystal composition with respect to a high frequency electric field applied thereto, the liquid crystal composition (77) has a dielectric scattering phenomenon in which a dielectric anisotropy with respect to a low frequency electric field is larger than the absolute value of a dielectric anisotropy with respect to a high frequency electric field.
Inventors
- 👤 Koh Fujimura
- 👤 Kenzo 403 Takamatsucho-Royal-Heights Endo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 15:24
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1238; G06K15/1242; G06K15/1252; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/137; G02F1/139; G02F1/1392; C; C09; C09K; C09K19/00; C09K19/04; C09K19/0403; C09K2019/0407; C09K19/06; C09K19/08; C09K19/30; C09K19/3001; C09K19/3066; C09K19/3068; C09K2019/3075; C09K2019/3077; C09K2019/3083; G02F1/13756
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
133 words
A liquid crystal apparatus comprising: first and second substrates (57, 59) opposing each other; at least one first electrode (SE1, SE2) formed on an inner surface of said first substrate (57); at least one second electrode (CE1, CE2) formed on an inner surface of said second substrate (59); a liquid crystal composition (77) provided between said first electrode (SE1, SE2) and said second electrode (CE1, CE2); and a seal member (61, 63) for sealing said liquid crystal composition (77) in a predetermined portion between said first and second substrates (57, 59), characterized in that said liquid crystal composition (77) exhibits a dielectric scattering phenomenon in which a dielectric anisotropy with respect to a low frequency application is larger than an absolute value of a dielectric anisotropy with respect to a high frequency application.
Claim 2
Dependent Claim
133 words
A liquid crystal apparatus comprising: first and second substrates (57, 59) opposing each other; at least one first electrode (SE1, SE2) formed on an inner surface of said first substrate (57); at least one second electrode (CE1, CE2) formed on an inner surface of said second substrate (59); a liquid crystal composition (77) provided between said first electrode (SE1, SE2) and said second electrode (CE1, CE2); and a seal member (61, 63) for sealing said liquid crystal composition (77) in a predetermined portion between said first and second substrates (57, 59), characterized in that said liquid crystal composition (77) exhibits a dielectric scattering phenomenon in which a dielectric anisotropy with respect to a low frequency application is larger than an absolute value of a dielectric anisotropy with respect to a high frequency application.
Claim 3
Dependent Claim
71 words
An apparatus according to claim 1, characterized in that said liquid crystal composition (77) has a dielectric characteristic such that a dielectric anisotropy with respect to an application electric field having a low frequency 1/10 a crossing frequency at which the dielectric anisotropy becomes 0 is larger than an absolute value of a dielectric anisotropy with respect to an application electric field having a high frequency 10 times the crossing frequency.
Claim 4
Dependent Claim
70 words
An apparatus according to claim 2, characterized in that said liquid crystal composition (77) has a dielectric characteristic such that the dielectric anisotropy with respect to the application electric field having the low frequency 1/10 the crossing frequency is larger than 3.5, and the absolute value of the dielectric anisotropy with respect to the application electric field having the high frequency 10 times the crossing frequency is larger than 2.0.
Claim 5
Dependent Claim
55 words
An apparatus according to claim 3, characterized in that said liquid crystal composition (77) has a ratio of the dielectric anisotropy with respect to the application electric field having the low frequency to the absolute value of the dielectric anisotropy with respect to the application electric field having the high frequency of 1.2 to 5.
Claim 6
Dependent Claim
38 words
An apparatus according to claim 1, characterized in that said liquid crystal composition (77) comprises: a mixture of a plurality of liquid crystal compounds each in a liquid crystal phase; and a dichroic dye dissolved in the mixture.
Claim 7
Dependent Claim
54 words
An apparatus according to claim 1, characterized in that a ratio of a voltage applied between said first and second electrodes (SE1, SE2, CE1, CE2) to a thickness of said liquid crystal composition (77) between said first and second electrodes (SE1, SE2, CE1, CE2) falls within a range between 3.5 {V/µm} and 5.8 {V/µm}.
Claim 8
Dependent Claim
37 words
An apparatus according to claim 6, characterized in that the thickness of said liquid crystal composition (77) between said first and second electrodes (SE1, SE2, CE1, CE2) falls within a range between 4.5 {pm} and 6.5 {µm}.
Claim 9
Dependent Claim
32 words
An apparatus according to claim 6, characterized in that the voltage applied between the first and second electrodes (SE1, SE2, CE1, CE2) falls within a range between 25 {V} and 27.5 {V}.
Claim 10
Dependent Claim
84 words
An apparatus according to claim 1, characterized in that said liquid crystal apparatus comprises: a liquid crystal shutter portion (SP) in which said light shutter is constituted by parts of opposing portions of said first and second electrodes (SE1, SE2, CE1, CE2) and a part of said liquid crystal composition (77) allocated between said first and second electrodes (SE1, SE2, CE1, CE2); and means (71, 73) communicating with said liquid crystal shutter portion (SP), for absorbing a pressure of said liquid crystal composition (77).
Claim 11
Dependent Claim
38 words
An apparatus according to claim 9, characterized in that said absorbing means (71, 73) is a liquid crystal reservoir portion (71, 73), provided between said first and second substrates (57, 59), for storing said liquid crystal composition (77).
Claim 12
Dependent Claim
78 words
An apparatus according to claim 1, characterized in that said seal member (63) and said first and second substrates (57, 59) form a first region (SP) for sealing said liquid crystal composition (77) between opposing portions of said first and second . electrodes (SE1, SE2, CE1, CE2), and a second region (71, 73), communicating with said first region (SP) and having an area larger than that of said first region (SP), for storing said liquid crystal composition (77).
Claim 13
Dependent Claim
34 words
An apparatus according to claim 11, characterized in that said first region (SP) has a narrow stripe-shape, and said second region (71, 73) has an area larger than width of said first region (SP).
Claim 14
Dependent Claim
33 words
An apparatus according to claim 12, characterized in that said second region (71, 73) is formed on a line extending along a longitudinal direction of said first region (SP) of the narrow stripe-shape.
Claim 15
Dependent Claim
77 words
An apparatus according to claim 1, characterized in that said first electrode comprises: a shutter electrode (SE1, SE2) for applying an electric field to said liquid crystal composition (77) so as to form a light shutter; a terminal electrode (87) connected to external driving means (103); and a lead electrode (83) connecting said shutter electrode (SE1, SE2) and said terminal electrode (87) and formed to have a width narrower than that of said shutter electrode (SE1, SE2).
Claim 16
Dependent Claim
85 words
An apparatus according to claim 1, characterized in that said liquid crystal composition (77) comprises: a mixture of a plurality of liquid crystal compounds each in a liquid crystal phase; and a dichroic dye dissolved in the mixture, and wherein a ratio of a voltage applied between said first and second electrodes (SE1, SE2, CE1, CE2) to a thickness of said liquid crystal composition (77) between said first and second electrodes (SE1, SE2, CE1, CE2) falls within a range between 3.5 {V/um} and 5.8 {V/µm}.
References Cited (Backward Citations)
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