Patent US5293534A successfully refreshed from Google Patents.
US5293534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal device
Assignee: Canon Inc
•
Filing: 1992-07-28
•
Granted: 1994-03-08
•
Expires: 2012-07-28
Abstract
Abstract A liquid crystal device is formed by disposing a ferroelectric smectic liquid crystal having two stable molecular orientation states between opposite electrodes formed on a pair of substrates, and disposing a polarizer and an analyzer in proximity with the substrates so that one of the two molecular orientation states provides a bright state and the other molecular orientation state provides a dark state. In case where a domain with a minor areal size changing with time occurs in an effective display area in either one (or both) of the bright and dark display states of the display area, the polarizer and analyzer are disposed in such a position that the domain with a minor areal size changing with time is present (in a larger total area when it is present) in the bright state (than when it is present in the dark state), whereby improvements are attained in respects of flickering persistence, contrast and/or transmittance.
Inventors
- 👤 Tadashi Mihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:29
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/139; G02F1/141; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133528; G02F1/133531; G02F1/1416
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
145 words
A liquid crystal display apparatus, comprising: a liquid crystal device, comprising a pair of substrates having thereon opposite electrodes, a ferroelectric smectic liquid crystal disposed between the electrodes so as to have two stable molecular orientation states, and a polarizer and an analyzer disposed adjacent to the substrates so that one of the two stable molecular orientation states provides a dark state and the other of the two stable molecular orientation states provides a bright state; wherein a domain with a minor areal size changing with time is formed in an effective display area, and the polarizer and the analyzer are disposed so that the domain is present in a bright state of the effective display area; a means for controlling a drive of the liquid crystal device; and a means for controlling power supply to the drive controlling means of the liquid crystal device.
Claim 2
Dependent Claim
145 words
A liquid crystal display apparatus, comprising: a liquid crystal device, comprising a pair of substrates having thereon opposite electrodes, a ferroelectric smectic liquid crystal disposed between the electrodes so as to have two stable molecular orientation states, and a polarizer and an analyzer disposed adjacent to the substrates so that one of the two stable molecular orientation states provides a dark state and the other of the two stable molecular orientation states provides a bright state; wherein a domain with a minor areal size changing with time is formed in an effective display area, and the polarizer and the analyzer are disposed so that the domain is present in a bright state of the effective display area; a means for controlling a drive of the liquid crystal device; and a means for controlling power supply to the drive controlling means of the liquid crystal device.
Claim 3
Dependent Claim
186 words
A liquid crystal display device comprising: a liquid crystal device comprising a pair of substrates having thereon opposite electrodes, a ferroelectric smectic liquid crystal disposed between the electrodes so as to have two stable molecular orientation states, and a polarizer and an analyzer disposed adjacent to the substrates so that one of the two stable molecular orientation states provides a dark state and the other of the two stable molecular orientation states provides a bright state; wherein a domain with a minor areal size changing with time is formed in an effective display area, and the polarizer and the analyzer are disposed so that the domain is present in a larger total area when it is present in a bright state of the effective display area than when it is present in a dark state of the effective display area; a means for driving the liquid crystal device depending on given image signals; and a light source; and a means for controlling a drive of the liquid crystal device and a means for controlling power supply to the drive controlling means of the liquid crystal device.
Claim 4
Dependent Claim
186 words
A liquid crystal display device comprising: a liquid crystal device comprising a pair of substrates having thereon opposite electrodes, a ferroelectric smectic liquid crystal disposed between the electrodes so as to have two stable molecular orientation states, and a polarizer and an analyzer disposed adjacent to the substrates so that one of the two stable molecular orientation states provides a dark state and the other of the two stable molecular orientation states provides a bright state; wherein a domain with a minor areal size changing with time is formed in an effective display area, and the polarizer and the analyzer are disposed so that the domain is present in a larger total area when it is present in a bright state of the effective display area than when it is present in a dark state of the effective display area; a means for driving the liquid crystal device depending on given image signals; and a light source; and a means for controlling a drive of the liquid crystal device and a means for controlling power supply to the drive controlling means of the liquid crystal device.
References Cited (Backward Citations)
US4367924A
Cited
US4613209A
Cited
US4596667A
Cited
US4614609A
Cited
US4561726A
Cited
US4589996A
Cited
US4763992A
Cited
US4615586A
Cited
US4783149A
Cited
US4747671A
Cited
US4818078A
Cited
US4796980A
Cited
US4824218A
Cited
US4893117A
Cited
US4765720A
Cited
US4776676A
Cited
US4790631A
Cited
US4952032A
Cited
EP0307959A2
Cited
US4932758A
Cited
EP0324433A1
Cited
US5007716A
Cited
EP0381526A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-03-07 | 1997-09-06 | 1998-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-07 | 2001-09-06 | 2002-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-07 | 2005-09-06 | 2006-03-08 | $7700.00 | Window Closed / Lapsed |