Patent US4701027A successfully refreshed from Google Patents.
US4701027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display device with increased view angle
Assignee: Xerox Corp
•
Filing: 1986-11-17
•
Granted: 1987-10-20
•
Expires: 2006-11-17
Abstract
Abstract A display device incorporates an optical demagnifying component adjacent the display surface. The optical component forms a demagnified real or virtual image of the display formed at the display viewing surface, effectively increasing the view angle of an observer.
Inventors
- 👤 Michael E. Harrigan
- 👤 John A. Durbin
- 👤 Ross E. Schroll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:40
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133526
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
61 words
An image bar display comprising: a display panel disposed in a viewing plane; means for providing a light output at said display panel; and an optical device placed adjacent the display side of said panel, said optical device adapted to increase the view angle of the displayed image by decreasing the size of the displayed image in at least one direction.
Claim 2
Dependent Claim
61 words
An image bar display comprising: a display panel disposed in a viewing plane; means for providing a light output at said display panel; and an optical device placed adjacent the display side of said panel, said optical device adapted to increase the view angle of the displayed image by decreasing the size of the displayed image in at least one direction.
Claim 3
Dependent Claim
15 words
The device according to claim 1 wherein the optical device is a negative cylinder lens.
Claim 4
Dependent Claim
49 words
A device according to claim 1 wherein said panel is a liquid crystal display assembly comprising: a liquid crystal material contained between two transparent electrodes; a variable voltage source connected across said electrodes; and an illumination means to direct light through the nondisplay face of said liquid crystal layer.
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) | 1990-10-19 | 1991-04-20 | 1991-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-19 | 1995-04-20 | 1995-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-19 | 1999-04-20 | 1999-10-20 | $7700.00 | Window Closed / Lapsed |