US4448489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide angle liquid crystal display that copes with interference coloring
Assignee: Hitachi Ltd
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Filing: 1982-05-17
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Granted: 1984-05-15
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Expires: 2002-05-17
Abstract
Abstract A liquid crystal display device assembly is of a two-layer construction including a first TN liquid crystal display device of a dot-matrix electrode pattern and a second TN liquid crystal display device of a segment electrode pattern disposed on the first display device in laminated relation. The product of refractivity anisotropy and thickness of the liquid crystal layer of the first liquid crystal display device is smaller than 0.6 μm, and that of the second liquid crystal display device is 0.6 μm or more.
Inventors
- 👤 Yukihiro Sato
- 👤 Yoshimichi Shibuya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:54
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1347; G02F1/13471; G02F1/1343; G02F1/134309; G02F1/134327; G02F1/134336; G02F1/137; G02F1/139; G02F1/1396
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
129 words
A liquid crystal display device assembly comprising: a first liquid crystal display device including a pair of substrates having electrodes in a dot-matrix pattern and a TN liquid crystal layer sandwiched between said substrates; and a second liquid crystal display device disposed in laminated relation with said first liquid crystal display device and including a pair of substrates having electrodes in a segment pattern and a TN liquid crystal layer sandwiched between said last-mentioned substrates, wherein the product of refractivity anisotropy Δn and thickness d of the liquid crystal layer of said first liquid crystal display device is smaller than 0.6 μm, and the product of refractivity anisotropy Δn and thickness d of the liquid crystal layer of said second liquid crystal display device is 0.6 μm or more.
Claim 2
Dependent Claim
129 words
A liquid crystal display device assembly comprising: a first liquid crystal display device including a pair of substrates having electrodes in a dot-matrix pattern and a TN liquid crystal layer sandwiched between said substrates; and a second liquid crystal display device disposed in laminated relation with said first liquid crystal display device and including a pair of substrates having electrodes in a segment pattern and a TN liquid crystal layer sandwiched between said last-mentioned substrates, wherein the product of refractivity anisotropy Δn and thickness d of the liquid crystal layer of said first liquid crystal display device is smaller than 0.6 μm, and the product of refractivity anisotropy Δn and thickness d of the liquid crystal layer of said second liquid crystal display device is 0.6 μm or more.
Claim 3
Dependent Claim
26 words
A liquid crystal display device assembly according to claim 1 wherein said second liquid crystal display device is superimposed on said first liquid crystal display 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) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |