US5132816A
Expired / Lapsed
US
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Ferroelectric liquid crystal device and method of manufacturing the same
Assignee: Sharp Corp
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Filing: 1990-01-31
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Granted: 1992-07-21
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Expires: 2010-01-31
Abstract
Abstract A ferroelectric liquid crystal device (81) has transparent plates (83a, 83b), on which transparent electrodes (85a, 85b) are formed, arranged opposed to each other to form a space therebetween, with ferroelectric liquid crystals (95) sealed in the space. Black masks (89b) are arranged between the transparent electrodes (85b). Portions of the black masks (89b) extend over the transparent electrodes (85b). Black masks (89a) are arranged between the transparent electrodes (85a), with portions of the black masks (89a) extending over the transparent electrodes (85a). Since black masks (89a, 89b) are provided between the transparent electrodes (85a, 85b), respectively, state of display can be made uniform in non-pixel portions. Since the black masks (89a, 89b) on the transparent electrodes (85a, 85b) prevents undesired inversion of spontaneous polarization of the liquid crystal molecules in the pixel portions, the state of display of the pixel portions can be made stable.
Inventors
- 👤 Nobuyuki Itoh
- 👤 Tokihiko Shinomiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:49
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/139; G02F1/141; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133509; G02F1/133512; G02F1/133345; G02F1/1343; G02F1/134309; G02F1/134336
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
164 words
A ferroelectric liquid crystal device having ferroelectric liquid crystals sealed between first and second plates arranged opposing each other to form a space, comprising: a second electrode portion arranged on a surface of said second plate, facing said first plate; a plurality of first electrode portions arranged, spaced apart from each other, on a surface of said first plate facing said second plate; light intercepting members provided between adjacent ones of said first electrode portions, partially overlapping each of said plurality of first electrode portions; and an inversion preventing member provided on an outside edge of an area where said plurality of first electrode portions and said second electrode portion overlap with each other on the main surface of one of said first and second electrode portions for preventing undesired inversion of spontaneous polarization of molecules of said ferroelectric liquid crystals, said inversion preventing member being provided on a side of said outside edge on which said inversion of spontaneous polarization tends to occur.
Claim 2
Dependent Claim
164 words
A ferroelectric liquid crystal device having ferroelectric liquid crystals sealed between first and second plates arranged opposing each other to form a space, comprising: a second electrode portion arranged on a surface of said second plate, facing said first plate; a plurality of first electrode portions arranged, spaced apart from each other, on a surface of said first plate facing said second plate; light intercepting members provided between adjacent ones of said first electrode portions, partially overlapping each of said plurality of first electrode portions; and an inversion preventing member provided on an outside edge of an area where said plurality of first electrode portions and said second electrode portion overlap with each other on the main surface of one of said first and second electrode portions for preventing undesired inversion of spontaneous polarization of molecules of said ferroelectric liquid crystals, said inversion preventing member being provided on a side of said outside edge on which said inversion of spontaneous polarization tends to occur.
Claim 3
Dependent Claim
17 words
A ferroelectric liquid crystal device according to claim 1, wherein said light intercepting member is electrically insulative.
Claim 4
Dependent Claim
82 words
The ferroelectric liquid crystal device according to claim 1, further comprising: a first alignment film formed to cover said plurality of first electrode portions and said light intercepting members; and a second alignment film formed to cover said second electrode portion, the distance between the second alignment film and the first alignment film positioned on the light intercepting members being less than the distance between the second alignment film and the first alignment film positioned on the plurality of first electrode portions.
Claim 5
Dependent Claim
21 words
A ferroelectric liquid crystal device according to claim 1, wherein said inversion preventing member is at least 0.2 μm in thickness.
Claim 6
Dependent Claim
25 words
A ferroelectric liquid crystal device according to claim 1, wherein said inversion preventing member is provided on the main surface of said first electrode portion.
Claim 7
Dependent Claim
41 words
A ferroelectric liquid crystal device according to claim 5, wherein said inversion preventing member covers a portion existing between adjacent ones of said first electrode portions, said inversion preventing member being positioned in this portion serving as said light intercepting member.
Claim 8
Dependent Claim
60 words
A ferroelectric liquid crystal device according to claim 1, wherein said second electrode portion comprises a plurality of second electrode portions arranged so as to be spaced apart from each other on a main surface of said second plate, and said plurality of second electrode portions and said plurality of first electrode portions intersect with each other in three dimensions.
Claim 9
Dependent Claim
26 words
A ferroelectric liquid crystal device according to claim 7, wherein said light intercepting member is provided between adjacent ones of said plurality of second electrode portions.
Claim 10
Dependent Claim
91 words
A ferroelectric liquid crystal device according to claim 7, wherein an area where each of said first electrode portion and said corresponds second electrode portion intersect with each other in three dimensions is rectangular in shape, and said inversion preventing member is provided on one side along a first dimension of said rectangular shape, positioned on the side where said inversion of spontaneous polarization of the ferroelectric liquid crystal molecule tends to occur, and on two sides along a second dimension of said rectangular shape, being positioned on both sides thereof.
Claim 11
Dependent Claim
72 words
A ferroelectric liquid crystal device according to claim 9, wherein said inversion preventing member is provided on one side, along a lengthwise dimension of said plurality of first electrode portions on the main surface of said plurality of first electrode portions, and said inversion preventing member is provided on two opposing sides, along a lengthwise dimension of said second electrode portions, on the main surface of said plurality of second electrode portions.
Claim 12
Dependent Claim
66 words
A ferroelectric liquid crystal device according to claim 7, wherein an area where each said first electrode portion and each said corresponding second electrode portion intersect with each other in three dimensions is rectangular in shape, and said inversion preventing member is provided on two opposing sides along a first dimension of said rectangular and on two opposing sides along a second dimension of said rectangle.
Claim 13
Dependent Claim
69 words
A ferroelectric liquid crystal device according to claim 11, wherein said inversion preventing member is provided on one and another side, along a lengthwise dimension of said first electrode portion, on the main surface of said first electrode portion, and said inversion preventing member is provided on one and another side along a lengthwise dimension of said second electrode portion on the main surface of said second electrode portion.
Claim 14
Dependent Claim
142 words
A ferroelectric liquid crystal device having ferroelectric liquid crystals sealed between first and second plates arranged opposing each other to form a space, comprising: a second electrode portion arranged on a surface of said second plate, facing said first plate; a plurality of first electrode portions arranged, spaced apart from each other, on a surface of said first plate facing said second plate; and an inversion preventing member provided on an outside edge of an area where said plurality of first electrode portions and said second electrode portion overlap with each other on the main surface of one of said first and second electrode portion, for preventing undesired inversion of spontaneous polarization of molecules of said ferroelectric liquid crystals; said inversion preventing member being formed on a side of said outside edge where said inversion of the spontaneous polarization tends to occur.
Claim 15
Dependent Claim
142 words
A ferroelectric liquid crystal device having ferroelectric liquid crystals sealed between first and second plates arranged opposing each other to form a space, comprising: a second electrode portion arranged on a surface of said second plate, facing said first plate; a plurality of first electrode portions arranged, spaced apart from each other, on a surface of said first plate facing said second plate; and an inversion preventing member provided on an outside edge of an area where said plurality of first electrode portions and said second electrode portion overlap with each other on the main surface of one of said first and second electrode portion, for preventing undesired inversion of spontaneous polarization of molecules of said ferroelectric liquid crystals; said inversion preventing member being formed on a side of said outside edge where said inversion of the spontaneous polarization tends to occur.
Claim 16
Dependent Claim
123 words
A ferroelectric liquid crystal device according to claim 13, wherein said second electrode portion comprises a plurality of second electrode portions arranged so as to be spaced apart from each other on the main surface of said second plate; said plurality of second electrode portions and said plurality of first electrode portions intersect with each other in three dimensions; an area of said intersection being rectangular in shape; said inversion preventing member is provided on one side along a first dimension of said rectangular shape, positioned on the side where said inversion of the spontaneous polarization of the ferroelectric liquid crystal molecules tends to occur, and on two sides along a second dimension of said rectangular shape, being positioned on both sides thereof.
Claim 17
Dependent Claim
75 words
A ferroelectric liquid crystal device according to claim 14, wherein said inversion preventing member is provided on one side, along a lengthwise dimension of said plurality of firs electrode portions, on the main surface of said plurality of first electrode portions, and said inversion preventing member is provided on one and another side, along a lengthwise dimension of said plurality of second electrode portions on the main surface of said plurality of second electrode portions.
Claim 18
Dependent Claim
98 words
A ferroelectric liquid crystal device according to claim 13, wherein said second electrode portion comprises a plurality of second electrode portions arranged so as to be spaced apart from each other on the main surface of said second plate, said plurality of second electrode portions and said plurality of first electrode portions intersect with each other in three dimensions, an area of said intersection being rectangular in shape, and said inversion preventing member is provided on two opposing sides along a first dimension of said rectangle and on two opposing sides along a second dimension of said rectangle.
Claim 19
Dependent Claim
68 words
A ferroelectric liquid crystal device according to claim 16, wherein said inversion preventing member is provided on two opposing sides, along a lengthwise dimension of the first electrode portion on the main surface of said first electrode portion; and said inversion preventing member is provided on one and another side, along a lengthwise dimension of said second electrode portion on the main surface of said second electrode portion.
Claim 20
Independent Claim
214 words
A method of manufacturing a ferroelectric liquid crystal device, including a layer with ferroelectric liquid crystals, comprising the steps of: forming a plurality of first electrode portions arranged so as to be spaced apart from each other on a surface of said first plate; forming an inversion preventing member for preventing undesired inversion of spontaneous polarization of molecules of said ferroelectric liquid crystals on one side of each of said plurality of first electrode portions along a lengthwise dimension, on the main surface of said first electrode portion; forming a plurality of second electrode portions spaced apart from each other on a surface of a second plate; forming said inversion preventing member on two opposing sides, along a lengthwise dimension of said plurality of second electrode portions on a main surface of said second electrode portion; and arranging said first plate and said second plate opposed to each other such that a space is formed therebetween and said plurality of first electrode portions and said plurality of second electrode portions intersect with each other in three dimensions; said inversion preventing formed on the main surface of said first electrode portion being provided on a side where said inversion of the spontaneous polarization tends to occur; and sealing said ferroelectric liquid crystals in said space.
Claim 21
Independent Claim
214 words
A method of manufacturing a ferroelectric liquid crystal device, including a layer with ferroelectric liquid crystals, comprising the steps of: forming a plurality of first electrode portions arranged so as to be spaced apart from each other on a surface of said first plate; forming an inversion preventing member for preventing undesired inversion of spontaneous polarization of molecules of said ferroelectric liquid crystals on one side of each of said plurality of first electrode portions along a lengthwise dimension, on the main surface of said first electrode portion; forming a plurality of second electrode portions spaced apart from each other on a surface of a second plate; forming said inversion preventing member on two opposing sides, along a lengthwise dimension of said plurality of second electrode portions on a main surface of said second electrode portion; and arranging said first plate and said second plate opposed to each other such that a space is formed therebetween and said plurality of first electrode portions and said plurality of second electrode portions intersect with each other in three dimensions; said inversion preventing formed on the main surface of said first electrode portion being provided on a side where said inversion of the spontaneous polarization tends to occur; and sealing said ferroelectric liquid crystals in said space.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-21 | 1996-01-20 | 1996-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-21 | 2000-01-20 | 2000-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-21 | 2004-01-20 | 2004-07-21 | $7700.00 | Window Closed / Lapsed |