US4470045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffusion-lighted magneto-optic display
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1982-05-05
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Granted: 1984-09-04
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Expires: 2002-05-05
Abstract
Abstract A magneto-optic display diffusion lighted by incident light. A conventional magneto-optic display comprising a polarization analyzer sheet, a magneto-optic chip, and a polarizer sheet are mounted with the polarizer sheet on the front surface of a transparent slab having a diffusion surface on its back surface. The edges of the slab are adapted to direct incident light against the diffusion surface and cause diffused light to pass out through the magneto-optic display to illuminate it from behind by diffused light. In one embodiment, the edge is a reflective edge. In another embodiment, the edge is a refractive edge.
Inventors
- 👤 Robert H. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:21
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/09
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
A diffusion-lighted display comprising: (a) a magneto-optic display unit including: (1) a polarization analyzer sheet; (2) a magneto-optic chip adapted to be connected to and driven by a display driver; and (3) a polarizer sheet; (b) a slab of transparent material having said polarizer sheet of said magneto-optic display unit adjacent the front surface thereof and a light colored diffusion surface on the back surface thereof; and (c) said slab having light directing means at the periphery thereof for directing front incident light into said slab and against said diffusion surface to cause diffused light from said diffusion surface to pass through said magmagneto-optic display unit.
Claim 2
Dependent Claim
106 words
A diffusion-lighted display comprising: (a) a magneto-optic display unit including: (1) a polarization analyzer sheet; (2) a magneto-optic chip adapted to be connected to and driven by a display driver; and (3) a polarizer sheet; (b) a slab of transparent material having said polarizer sheet of said magneto-optic display unit adjacent the front surface thereof and a light colored diffusion surface on the back surface thereof; and (c) said slab having light directing means at the periphery thereof for directing front incident light into said slab and against said diffusion surface to cause diffused light from said diffusion surface to pass through said magmagneto-optic display unit.
Claim 3
Dependent Claim
44 words
The display of claim 1 wherein: said light directing means comprises a portion of the periphery of said slab being angled at an acute angle with respect to said diffusion surface such that incident light striking said portion is refracted against said diffusion surface.
Claim 4
Dependent Claim
59 words
The display of claim 1 wherein: said light directing means comprises a portion of the periphery of said slab being angled at an obtuse angle with respect to said diffusion surface and has a reflective back surface such that incident light striking said portion passes into said portion and is reflected from said reflective surface against said diffusion surface.
Claim 5
Dependent Claim
12 words
The display of claim 1 in which said polarizer sheet is linear.
Claim 6
Dependent Claim
31 words
The display of claim 1 in which said incident light originates from a source generally in front of said magneto-optic display unit and, therefore, in front of said slab front surface.
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) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |