US4586790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display panel having uniaxially-stretched organic polymer film as the substrate
Assignee: Hitachi Ltd
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Filing: 1983-02-15
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Granted: 1986-05-06
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Expires: 2003-02-15
Abstract
Abstract In a display panel consisting essentially of a pair of substrates whose opposed surfaces are equipped with transparent conductive layers and at least one of which consists of an organic polymer film, and of a display member interposed between said pair of substrates, the improvement wherein said organic polymer film is a uniaxially stretched polyester film.
Inventors
- 👤 Takao Umeda
- 👤 Takao Miyashita
- 👤 Yuzuru Shimazaki
- 👤 Tatsuo Igawa
- 👤 Ken Sasaki
- 👤 Shigeru Matsuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:06
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/13363; G02F1/133305; G02F1/133635; G02F2413/00; G02F2413/04; G02F2413/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
In a display panel comprised of a pair of substrates whose opposed surfaces are equipped with transparent conductive layers and at least one of which comprises an organic polymer film and a polarizer disposed adjacent to said polymer film, and of a display member interposed between said pair of substrates, the improvement wherein said organic polymer film is a uniaxially stretched polyester film selected from the group consisting of uniaxially stretched polyethylene terephthalate, uniaxially stretched polyethylene isophthalate, uniaxially stretched polyphenylene isophthalate and uniaxially stretched polybutylene terephthalate; the angle defined between the slow and fast principal axes of birefringence of said uniaxially stretched polymer film and the direction of the axis of polarization of said polarizer is within approximately ±3°.
Claim 2
Dependent Claim
119 words
In a display panel comprised of a pair of substrates whose opposed surfaces are equipped with transparent conductive layers and at least one of which comprises an organic polymer film and a polarizer disposed adjacent to said polymer film, and of a display member interposed between said pair of substrates, the improvement wherein said organic polymer film is a uniaxially stretched polyester film selected from the group consisting of uniaxially stretched polyethylene terephthalate, uniaxially stretched polyethylene isophthalate, uniaxially stretched polyphenylene isophthalate and uniaxially stretched polybutylene terephthalate; the angle defined between the slow and fast principal axes of birefringence of said uniaxially stretched polymer film and the direction of the axis of polarization of said polarizer is within approximately ±3°.
Claim 3
Dependent Claim
16 words
The display panel as defined in claim 1 wherein said display member is a liquid crystal.
Claim 4
Dependent Claim
20 words
The display panel as defined in claim 1 which further includes a reflecting plate adjacent to one of said substrates.
Claim 5
Dependent Claim
31 words
The display panel as defined in claim 1 wherein each of said substrates consists of said uniaxially stretched polyester film and a polarizer disposed adjacent to said uniaxially stretched polyester film.
Claim 6
Dependent Claim
23 words
The display panel as defined in claim 4 wherein said uniaxially stretched polyester film is coated on both main surfaces of said polarizer.
Claim 7
Dependent Claim
52 words
The display panel as defined in claim 1 wherein the direction of the slow and fast principal axes of birefringence is the direction of the slow and fast principal axes of birefringence of said uniaxially stretched polyester film which has the greatest refractive index among a plurality of directions of said film.
Claim 8
Dependent Claim
19 words
The display panel as defined in claim 1, wherein said uniaxially stretched polyester film is uniaxially stretched polyethylene terephthalate.
References Cited (Backward Citations)
US3869196A
Cited
US4217160A
Cited
JPS54148548A
Cited
JPS5535325A
Cited
JPS55135816A
Cited
JPS5697318A
Cited
US4388375A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |