US4398804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display unit
Assignee: Nintendo Co Ltd
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Filing: 1980-07-18
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Granted: 1983-08-16
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Expires: 2000-07-18
Abstract
Abstract A reflection type liquid crystal display unit wherein twisted nematic liquid crystal molecules are used in a field effect mode. A polarizing sheet placed on the upper surface of the liquid crystal display element of the unit is formed with spacer projections geometrically distributed substantially over the entire surface area of the display unit by an embossing process, thereby defining a clearance of uniform predetermined thickness between the polarizing plate and the liquid crystal display element. As a result of this arrangement, formation of interference fringes known as Newton's rings is prevented.
Inventors
- 👤 Gunpei Yokoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:55
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133528
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
261 words
A liquid crystal display unit comprising: a liquid crystal display element (2) comprising a first transparent sheet (4), a second transparent sheet (6) arranged to face said first transparent sheet (4), whereby a gap is formed between the first and second transparent sheets, first electrode means (12) formed on one surface of said first transparent sheet, second electrode means (18) formed on one surface of said second transparent sheet and arranged to face said first electrode means, and liquid crystal means placed in said gap defined between one surface of each of said two transparent sheets; a reflecting sheet (24) disposed relative to the other surface of said second transparent sheet (6); first polarizing sheet means (62) disposed relative to the other surface of said first transparent sheet; second polarizing sheet means (22) located between said second transparent sheet and said reflecting sheet; protective sheet means (60) formed as a transparent resin sheet and located between said first transparent sheet and said first polarizing sheet (62); and first and second clearance means (44, 58) for forming a first clearance between said first transparent sheet (4) and said protective sheet (60) and a second clearance between said first polarizing sheet (62) and said protective sheet (60), said first and second clearance means each comprising a plurality of first and second projections (44, 58) each distributed uniformly in a geometric pattern over each surface of said protective sheet (60), said projections having a predetermined uniform height, and wherein said first and second projections are simultaneously formed by embossing said protective resin sheet (60).
Claim 2
Dependent Claim
261 words
A liquid crystal display unit comprising: a liquid crystal display element (2) comprising a first transparent sheet (4), a second transparent sheet (6) arranged to face said first transparent sheet (4), whereby a gap is formed between the first and second transparent sheets, first electrode means (12) formed on one surface of said first transparent sheet, second electrode means (18) formed on one surface of said second transparent sheet and arranged to face said first electrode means, and liquid crystal means placed in said gap defined between one surface of each of said two transparent sheets; a reflecting sheet (24) disposed relative to the other surface of said second transparent sheet (6); first polarizing sheet means (62) disposed relative to the other surface of said first transparent sheet; second polarizing sheet means (22) located between said second transparent sheet and said reflecting sheet; protective sheet means (60) formed as a transparent resin sheet and located between said first transparent sheet and said first polarizing sheet (62); and first and second clearance means (44, 58) for forming a first clearance between said first transparent sheet (4) and said protective sheet (60) and a second clearance between said first polarizing sheet (62) and said protective sheet (60), said first and second clearance means each comprising a plurality of first and second projections (44, 58) each distributed uniformly in a geometric pattern over each surface of said protective sheet (60), said projections having a predetermined uniform height, and wherein said first and second projections are simultaneously formed by embossing said protective resin sheet (60).
Claim 3
Dependent Claim
20 words
The liquid crystal display unit of claim 1, wherein said first and second transparent sheets are glass sheets (4, 6).
Claim 4
Dependent Claim
17 words
The liquid crystal display unit of claim 1, used as a display unit in a game device.
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) | 1986-08-15 | 1987-02-14 | 1987-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-15 | 1991-02-14 | 1991-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-15 | 1995-02-14 | 1995-08-16 | $7700.00 | Window Closed / Lapsed |