US5233385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
White light enhanced color field sequential projection
Assignee: Texas Instruments Inc
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Filing: 1991-12-18
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Granted: 1993-08-03
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Expires: 2011-12-18
Abstract
Abstract A method for increasing the brightness of a scene in a color projection system is disclosed. The brightness can be increased in both temporal and spatial filtering systems. In a temporal system, a portion of the total illumination time is allocated to white light to raise the overall brightness. In a spatial system, part of the illuminated area is allocated to white light. The parts could be allocated as regions on a spatial light modulator, or a spatial light modulator could be dedicated to that area to use white light.
Inventors
- 👤 Jeffrey B. Sampsell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:42
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3102; H04N9/3111; H04N9/3114; G; G09; G09G; G09G2310/00; G09G2310/02; G09G2310/0235
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
124 words
A method for spatial color filtered projection to increase brightness comprising: a. dividing an area to be illuminated by white light into four regions; b. allocating said four regions such that each region is dedicated to light with the wavelength of one of three primary additive colors, as well as white light; c. illuminating said regions; d. directing said light formed in an image onto a projection surface, such that said light from each of said regions is of the wavelength of its dedicated color when it impinges upon said surface; and e. selectively blending said light directed from said region allocated to white light with light directed from others of said regions to raise the overall brightness of said image on said surface.
Claim 2
Independent Claim
124 words
A method for spatial color filtered projection to increase brightness comprising: a. dividing an area to be illuminated by white light into four regions; b. allocating said four regions such that each region is dedicated to light with the wavelength of one of three primary additive colors, as well as white light; c. illuminating said regions; d. directing said light formed in an image onto a projection surface, such that said light from each of said regions is of the wavelength of its dedicated color when it impinges upon said surface; and e. selectively blending said light directed from said region allocated to white light with light directed from others of said regions to raise the overall brightness of said image on said surface.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein said area is a color wheel.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein said projection surface is a viewing screen
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein said projection surface is a photosensitive media.
Claim 6
Independent Claim
90 words
A method for temporal color filtered projection to increase brightness comprising: a. dividing a period of time for which a video frame is to be displayed into four segments; b. illuminating a spatial light modulator for said period; c. dedicating one filter for each of three primary additive colors as well as white light to one of said four segments; and d. directing light upon a projection surface from said spatial light modulator wherein said projection surface only receives light of one wavelength during any one of said four segments.
Claim 7
Independent Claim
90 words
A method for temporal color filtered projection to increase brightness comprising: a. dividing a period of time for which a video frame is to be displayed into four segments; b. illuminating a spatial light modulator for said period; c. dedicating one filter for each of three primary additive colors as well as white light to one of said four segments; and d. directing light upon a projection surface from said spatial light modulator wherein said projection surface only receives light of one wavelength during any one of said four segments.
Claim 8
Dependent Claim
14 words
The method of claim 5 wherein said four segments reside upon a color wheel.
Claim 9
Dependent Claim
13 words
The method of claim 5 wherein said projection surface is a viewing screen.
Claim 10
Dependent Claim
13 words
The method of claim 5 wherein said projection surface is a photosensitive media.
Claim 11
Dependent Claim
15 words
The method of claim 5 wherein said spatial light modulator is a deformable mirror device.
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) | 1996-08-02 | 1997-02-01 | 1997-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-02 | 2001-02-01 | 2001-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-02 | 2005-02-01 | 2005-08-03 | $7700.00 | Window Closed / Lapsed |