US5909204A
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US
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Color display system with spatial light modulator(s) having color-to-color variations in data sequencing
Assignee: Texas Instruments Inc
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Filing: 1997-01-03
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Granted: 1999-06-01
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Expires: 2017-01-03
Abstract
Abstract Methods of reducing artifacts in SLM-based display systems (10, 20), whose images are based on data displayed by bit-weight for pulse-width modulated intensity levels. A first method is suitable for systems (20) that use multiple SLMs (14) to concurrently display images of different colors, which are combined at the image plane. The data for each color are staggered in time (FIG. 4). A second method is suitable for either multiple SLM systems (20) or for systems (10) that use a single SLM (14) and a color wheel (17) to display differently colored images sequentially. The data for each color is arranged in a different data sequence (FIG. 5). In either method, the intensity transitions do not occur at the same time.
Inventors
- 👤 Richard O. Gale
- 👤 Gerhard P. Deffner
- 👤 Vishal Markandey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:54
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/3433; G09G3/346; H; H04; H04N; H04N5/00; H04N5/74; H04N5/7416; H04N5/7458; H04N9/00; H04N9/12; H04N9/31; G09G2310/00; G09G2310/02; G09G2310/0235; G09G2320/00; G09G2320/02; G09G2320/0261; G09G2320/0266; G09G3/2007; G09G3/2018; G09G3/2022; G09G5/00; G09G5/36; G09G5/39; G09G5/399; Y; Y10; Y10S; Y10S359/00; Y10S359/904
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
140 words
A method of reducing artifacts in an image display system having multiple spatial light modulators (SLMs), each SLM concurrently displaying images based on data representing a different color, comprising the steps of: determining a first display sequence for data of a first color, wherein said first display sequence represents the order of display of different bit-weights during each frame period; analyzing said first display sequence to determine energy levels during said first display sequence; determining a second display sequence for data of a second color, said second display sequence having substantially asymmetric energy transition levels as compared to said first display sequence; delivering said data of each color to a corresponding SLM; and displaying said data of each color, such that said data for each color combines simultaneously with said data for each other color, resulting in a colored image.
Claim 2
Independent Claim
140 words
A method of reducing artifacts in an image display system having multiple spatial light modulators (SLMs), each SLM concurrently displaying images based on data representing a different color, comprising the steps of: determining a first display sequence for data of a first color, wherein said first display sequence represents the order of display of different bit-weights during each frame period; analyzing said first display sequence to determine energy levels during said first display sequence; determining a second display sequence for data of a second color, said second display sequence having substantially asymmetric energy transition levels as compared to said first display sequence; delivering said data of each color to a corresponding SLM; and displaying said data of each color, such that said data for each color combines simultaneously with said data for each other color, resulting in a colored image.
Claim 3
Independent Claim
121 words
A method of reducing artifacts in an image display system having a single spatial light modulator (SLM), that sequentially displays images based on data representing different colors via a color wheel, comprising the steps of: determining a first display sequence for data of a first color, wherein said first display sequence represents the order of display of different bit-weights during each frame period; analyzing said first display sequence to determine energy levels during said first display sequence; determining a second display sequence for data of a second color, said second display sequence having substantially asymmetric energy transition levels as compared to said first display sequence; delivering said data of each color to said SLM; and displaying said data of each color.
Claim 4
Independent Claim
121 words
A method of reducing artifacts in an image display system having a single spatial light modulator (SLM), that sequentially displays images based on data representing different colors via a color wheel, comprising the steps of: determining a first display sequence for data of a first color, wherein said first display sequence represents the order of display of different bit-weights during each frame period; analyzing said first display sequence to determine energy levels during said first display sequence; determining a second display sequence for data of a second color, said second display sequence having substantially asymmetric energy transition levels as compared to said first display sequence; delivering said data of each color to said SLM; and displaying said data of each color.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2002-05-31 | 2002-11-30 | 2003-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-05-31 | 2006-11-30 | 2007-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-05-31 | 2010-11-30 | 2011-06-01 | $7700.00 | Window Closed / Lapsed |