US4770501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical modulation device and method of driving the same
Assignee: Canon Inc
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Filing: 1986-02-27
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Granted: 1988-09-13
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Expires: 2006-02-27
Abstract
Abstract An optical modulation device comprising a plurality of first signal lines (S 1 -S n -S N ); a plurality of second signal lines (G 1 -G l -G L ) intersecting with the first signal lines, a plurality of field effect transistors disposed at each intersection of the first and second signal lines, each field effect transistor comprising a gate connected to a second signal line, a first terminal other than the gate connected to a first signal line, and a second terminal other than the gate, a picture element electrode connected to the second terminal, a counter electrode disposed opposite to the picture element electrode and connected to a third signal line, and an optical modulation material showing a first stable state and a second stable state interposed between the picture element electrode and the counter electrode.
Inventors
- 👤 Yasuyuki Tamura
- 👤 Shinjiro Okada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:54
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3648; G09G3/3651; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G02F1/1362; G02F1/1368; G09G3/3655
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
185 words
A driving method for an optical modulation device, comprising: providing an optical modulation comprising a plurality of first signal lines (S 1 -S n -S N ); a plurality of second signal lines (G 1 -G l -G L ) intersecting with the first signal lines; a plurality of field effect transistors disposed at each intersection of the first and second signal lines, each field effect transistor comprising a gate connected to a second signal line, a first terminal other than the gate connected to a first signal line, and a second terminal other than the gate; a picture element electrode connected to the second terminal; a counter electrode disposed opposite to the picture element electrode and connected to a third signal line; and an optical modulation material showing a first stable state and a second stable state interposed between the picture element electrode and the counter electrode, applying scanning signals to the first signal lines connected to the first terminals of the field effect transistors and the third signal lines connected to the counter electrodes, and applying information signals to the second signal lines.
Claim 2
Dependent Claim
185 words
A driving method for an optical modulation device, comprising: providing an optical modulation comprising a plurality of first signal lines (S 1 -S n -S N ); a plurality of second signal lines (G 1 -G l -G L ) intersecting with the first signal lines; a plurality of field effect transistors disposed at each intersection of the first and second signal lines, each field effect transistor comprising a gate connected to a second signal line, a first terminal other than the gate connected to a first signal line, and a second terminal other than the gate; a picture element electrode connected to the second terminal; a counter electrode disposed opposite to the picture element electrode and connected to a third signal line; and an optical modulation material showing a first stable state and a second stable state interposed between the picture element electrode and the counter electrode, applying scanning signals to the first signal lines connected to the first terminals of the field effect transistors and the third signal lines connected to the counter electrodes, and applying information signals to the second signal lines.
Claim 3
Dependent Claim
37 words
A driving method according to claim 1, wherein said first signal lines connected to the sources or drains of the field effect transistors, and said second signal lines connected to the gates of the field effect transistors.
Claim 4
Dependent Claim
82 words
A driving method according to claim 1, which comprises: a first phase of applying a signal for orienting the optical modulating material to the first stable state to picture elements connected to selected first signal lines, selected second signal lines and selected third signal lines, and a second phase of applying a signal for orienting the optical modulation material to the second stable states to picture elements connected to selected first signal lines, selected third signal lines and non-selected second signal lines.
Claim 5
Dependent Claim
18 words
A driving method according to claim 3, wherein said first and second phases of operations are conducted simultaneously.
Claim 6
Dependent Claim
22 words
A driving method according to claim 1, wherein a plurality of the counter electrodes are disposed opposite to one picture element electrode.
Claim 7
Dependent Claim
17 words
A driving method according to claim 1, wherein said optical modulation material is a ferroelectric liquid crystal.
Claim 8
Dependent Claim
18 words
A driving method according to claim 1, wherein said optical modulation material is a chiral smectic liquid crystal.
Claim 9
Dependent Claim
18 words
A driving method according to claim 7, wherein said chiral smectic liquid crystal is in a non-helical structure.
Claim 10
Dependent Claim
17 words
A driving method according to claim 1, wherein said field effect transistor is a thin film transistor.
References Cited (Backward Citations)
US4204217A
Cited
US4448491A
Cited
US4367924A
Cited
US4613209A
Cited
US4508429A
Cited
GB2136185A
Cited
US4655561A
Cited
JPS60262136A
Cited
JPS60262137A
Cited
JPS614026A
Cited
JPS617829A
Cited
JPS617825A
Cited
JPS619625A
Cited
US4556727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |