US5029985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer liquid crystal display device
Assignee: Ricoh Co Ltd
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Filing: 1989-05-17
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Granted: 1991-07-09
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Expires: 2009-05-17
Abstract
Abstract The present invention discloses a multilayer liquid crystal display device which has superposed liquid crystal panel units having plastic film substrates. Spacers of a size not larger than 50 μm are dispersed on and fixed to one viewing area of the facing panel units to prevent contact between adjacent units and even when the viewing area of the device is large and/or even when the device is left alone under bad conditions, no Newton ring, no optical interference fringe or no uneven transmission are recognized on the display screen of the device.
Inventors
- 👤 Takumi Suzuki
- 👤 Hisao Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:33
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1347
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
57 words
A multilayer liquid crystal display device comprising at least two superposed liquid crystal panel units having plastic film substrates, fixing parts disposed between the adjacent panel units along peripheral portions of the units and a plurality of spacers sized not larger than 50 μm, dispersed between facing surfaces of the adjacent units and fixed to the surface.
Claim 2
Dependent Claim
57 words
A multilayer liquid crystal display device comprising at least two superposed liquid crystal panel units having plastic film substrates, fixing parts disposed between the adjacent panel units along peripheral portions of the units and a plurality of spacers sized not larger than 50 μm, dispersed between facing surfaces of the adjacent units and fixed to the surface.
Claim 3
Dependent Claim
25 words
A multilayer liquid crystal display device according to claim 1, wherein said spacers are fixed to a viewing area of one of said facing surfaces.
Claim 4
Dependent Claim
24 words
A multilayer liquid crystal display device according to claim 1, wherein a dispersion density of said spacers is 10 to 40 particles/mm 2 .
Claim 5
Dependent Claim
27 words
A multilayer liquid crystal display device according to claim 1, wherein said size of the spacers is smaller than a space formed between the adjacent panel units.
Claim 6
Dependent Claim
30 words
A multilayer liquid crystal display device according to claim 1, wherein a light transmission of said spacers at a wavelength of 350 to 800 nm is not higher than 90%.
Claim 7
Dependent Claim
19 words
A multilayer liquid crystal display device according to claim 1, wherein said plastic film is a polyethylene telephthalate film.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-08 | 1995-01-07 | 1995-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-08 | 1999-01-07 | 1999-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-08 | 2003-01-07 | 2003-07-09 | $7700.00 | Window Closed / Lapsed |