US4984872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide viewing angle avionics liquid crystal display
Assignee: Boeing North American Inc
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Filing: 1989-06-16
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Granted: 1991-01-15
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Expires: 2009-06-16
Abstract
Abstract A wide viewing angle avionics liquid crystal display is disclosed which utilizes a planar holographic optical element collimator disposed between the liquid crystal panel and the back light source. Also disclosed a method and apparatus for manufacturing a planar holographic optical element collimator.
Inventors
- 👤 Gerald L. Vick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:36
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/01; G02B27/0101; G02B27/0103; G02B5/00; G02B5/32; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/133602; G02F1/133606; G02B2027/0105; G02B2027/0107; G02B2027/0109; G02B2027/0118; G02B5/20; G02B5/28; G02B5/30; G02F1/133526; G03; G03H; G03H1/00; G03H1/04; G03H1/0402; G03H2001/0439
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
An avionics liquid display comprising: a liquid crystal panel having a front planar surface and a back planar surface; a front polarizer disposed upon the front planar surface of said liquid crystal panel; a diffuser disposed on said front polarizer; a back polarizer disposed on the back planar surface of said liquid crystal panel; a planar collimator disposed on said back polarizer; a diffuse back light emitting light incident upon said planar collimator.
Claim 2
Dependent Claim
73 words
An avionics liquid display comprising: a liquid crystal panel having a front planar surface and a back planar surface; a front polarizer disposed upon the front planar surface of said liquid crystal panel; a diffuser disposed on said front polarizer; a back polarizer disposed on the back planar surface of said liquid crystal panel; a planar collimator disposed on said back polarizer; a diffuse back light emitting light incident upon said planar collimator.
Claim 3
Dependent Claim
13 words
A display of claim 1 wherein said planar collimator comprises a rugate filter.
Claim 4
Dependent Claim
15 words
A display of claim 1 wherein said planar collimator comprises a holographic optical element collimator.
Claim 5
Dependent Claim
25 words
A display of claim 3 wherein said holographic optical element collimator further comprises a holographic recording medium having a predetermined optical interference pattern recorded thereon.
Claim 6
Dependent Claim
34 words
A display of claim 4 wherein said predetermined optical interference pattern further comprises an optical interference pattern resulting from interference from a reference beam normal to the recording medium and an off-angle object beam.
Claim 7
Dependent Claim
75 words
An avionics liquid crystal display comprising of a liquid crystal panel having a front planar surface and back planar surface; a front polarizer disposed upon the front planar surface of said liquid crystal panel; a diffuser disposed on said front polarizer; a back polarizer disposed upon the back planar surface of said liquid crystal panel; a planar collimator disposed on said back polarizer; and a diffuse back light source disposed outwardly of said planar collimator.
Claim 8
Dependent Claim
75 words
An avionics liquid crystal display comprising of a liquid crystal panel having a front planar surface and back planar surface; a front polarizer disposed upon the front planar surface of said liquid crystal panel; a diffuser disposed on said front polarizer; a back polarizer disposed upon the back planar surface of said liquid crystal panel; a planar collimator disposed on said back polarizer; and a diffuse back light source disposed outwardly of said planar collimator.
Claim 9
Dependent Claim
17 words
A display of claim 6 wherein said diffuse back light source comprises a plurality of fluorescent lamps.
Claim 10
Dependent Claim
169 words
A compact light weight display device, of the type used in an aviation environment, comprising: a diffuse back lamp having a plurality of fluorescent tubes disposed in a planar configuration therein, said diffuse back light source having a planar front surface; a planar holographic recording medium, for collimating the diffuse light from said diffuse back light source, said holographic recording medium having a predetermined optical interference pattern recorded thereon, said holographic recording medium being disposed adjacent to said front planar surface of said diffuse back light source; a back polarizer for polarizing the collimated light from said holographic recording medium, said back polarizer disposed on the holographic recording medium; a liquid crystal panel having a front planar and a back planar surface disposed adjacent to said back polarizer so that said back planar surface of said liquid crystal panel is adjacent with said back polarizer; and a front polarizer disposed adjacent to said front planar surface of said liquid crystal panel with a diffuser disposed on said front polarizer.
Claim 11
Dependent Claim
169 words
A compact light weight display device, of the type used in an aviation environment, comprising: a diffuse back lamp having a plurality of fluorescent tubes disposed in a planar configuration therein, said diffuse back light source having a planar front surface; a planar holographic recording medium, for collimating the diffuse light from said diffuse back light source, said holographic recording medium having a predetermined optical interference pattern recorded thereon, said holographic recording medium being disposed adjacent to said front planar surface of said diffuse back light source; a back polarizer for polarizing the collimated light from said holographic recording medium, said back polarizer disposed on the holographic recording medium; a liquid crystal panel having a front planar and a back planar surface disposed adjacent to said back polarizer so that said back planar surface of said liquid crystal panel is adjacent with said back polarizer; and a front polarizer disposed adjacent to said front planar surface of said liquid crystal panel with a diffuser disposed on said front polarizer.
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) | 1994-01-14 | 1994-07-16 | 1995-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-14 | 1998-07-16 | 1999-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-14 | 2002-07-16 | 2003-01-15 | $7700.00 | Window Closed / Lapsed |