Patent US5044709A successfully refreshed from Google Patents.
US5044709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
LED array polarized image source/0 degree hologram virtual image head up display
Assignee: Delphi Technologies Inc
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Filing: 1988-11-30
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Granted: 1991-09-03
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Expires: 2008-11-30
Abstract
Abstract A holographic display system having a dynamic image source including selectively activated light emitting diodes for providing spectrally narrowband and narrow beam imaging illumination through an apertured mask, and further having a mirror reflection hologram for reflecting the image to provide an observable virtual image. The image source further includes a polarizer and an optional diffuser.
Inventors
- 👤 Ronald T. Smith
- 👤 Mark McDonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:10
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/10; G02B27/1086; G02B27/1093; G02B27/01; G02B27/0101; G02B27/0103; G02B2027/0118; G02B2027/012; G02B5/00; G02B5/30
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
80 words
A virtual image display system comprising: means for providing a dynamically changing image comprising means for providing beams of light having a narrow spectral bandwidth of less than about 50 nanometers, wherein said means for providing light beams includes light emitting diodes and a mask having openings for selectively masking the illumination provided by said light emitting diodes; and a reflection hologram having fringe planes equidistant to the hologram surface for reflecting the image to produce an observable virtual image.
Claim 2
Dependent Claim
80 words
A virtual image display system comprising: means for providing a dynamically changing image comprising means for providing beams of light having a narrow spectral bandwidth of less than about 50 nanometers, wherein said means for providing light beams includes light emitting diodes and a mask having openings for selectively masking the illumination provided by said light emitting diodes; and a reflection hologram having fringe planes equidistant to the hologram surface for reflecting the image to produce an observable virtual image.
Claim 3
Dependent Claim
19 words
The virtual image display system of claim 1 wherein said means for providing light beams further includes a polarizer.
Claim 4
Dependent Claim
19 words
The virtual image display system of claim 1 wherein said means for providing light beams further includes a diffuser.
Claim 5
Dependent Claim
32 words
The virtual image display system of claim 1 wherein said mirror reflection hologram having fringe planes equidistant to the hologram surface is tuned to the spectral bandwidth of said image providing means.
Claim 6
Dependent Claim
32 words
The virtual image display system of claim 1 wherein said reflection hologram having fringe planes equidistant to the hologram surface is tuned to the P-polarization spectral bandwidth of said image providing means.
Claim 7
Dependent Claim
85 words
A virtual image display system comprising: means for providing dynamically changing illumination having a narrow spectral bandwidth of less than about 50 nanometers wherein illumination providing means includes light emitting diodes and a mask having openings for selectively masking the illumination provided by said light emitting diodes; and a non-slanted mirror refection hologram having fringe planes equidistant to the hologram surface tuned to be reflective over the spectral bandwidth of said illumination providing means for reflecting said narrowband illumination to produce an observable virtual image.
Claim 8
Dependent Claim
85 words
A virtual image display system comprising: means for providing dynamically changing illumination having a narrow spectral bandwidth of less than about 50 nanometers wherein illumination providing means includes light emitting diodes and a mask having openings for selectively masking the illumination provided by said light emitting diodes; and a non-slanted mirror refection hologram having fringe planes equidistant to the hologram surface tuned to be reflective over the spectral bandwidth of said illumination providing means for reflecting said narrowband illumination to produce an observable virtual image.
Claim 9
Dependent Claim
16 words
The virtual image display system of claim 6 wherein said illumination providing means includes a polarizer.
Claim 10
Dependent Claim
16 words
The virtual image display system of claim 7 wherein said illumination providing means includes a diffuser.
Claim 11
Dependent Claim
94 words
A virtual image display system comprising: means for providing dynamically changing illumination having a narrow spectral bandwidth of less than about 50 nanometers wherein said illumination providing means includes light emitting diodes and optical elements for selectively masking the illumination provided by said light emitting diodes; and a mirror reflection hologram having fringe planes equidistant to the hologram surface tuned to be reflective over the spectral bandwidth of said illumination providing means for reflecting said narrowband illumination to produce an observable virtual image; said narrowband illumination being substantially confined to an eyebox spatial region.
Claim 12
Dependent Claim
94 words
A virtual image display system comprising: means for providing dynamically changing illumination having a narrow spectral bandwidth of less than about 50 nanometers wherein said illumination providing means includes light emitting diodes and optical elements for selectively masking the illumination provided by said light emitting diodes; and a mirror reflection hologram having fringe planes equidistant to the hologram surface tuned to be reflective over the spectral bandwidth of said illumination providing means for reflecting said narrowband illumination to produce an observable virtual image; said narrowband illumination being substantially confined to an eyebox spatial region.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-09-02 | 1995-03-04 | 1995-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-02 | 1999-03-04 | 1999-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-02 | 2003-03-04 | 2003-09-03 | $7700.00 | Window Closed / Lapsed |