Patent US6002452A successfully refreshed from Google Patents.
US6002452A
Expired / Lapsed
US
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Sequential color display system with spoke synchronous frame rate conversion
Assignee: Texas Instruments Inc
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Filing: 1996-06-06
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Granted: 1999-12-14
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Expires: 2016-06-06
Abstract
Abstract A sequential color display system (10) suited to receive data (20) at different rates without discarding or filtering video data. The mismatch of bandwidths between the input source video data and the output sequential color display is accommodated by retaining a modified synchronous operation. A color wheel (50) having a plurality of segments is utilized whereby the input frame rate in reference to the color wheel rate is always a ratio of integers. Using a digital micromirror device (44) spatial light modulator, no mixing of frame-to-frame bit planes is required during a colored segment. In the preferred embodiment, the ratio of integers is 7-to-6 for a 50 hertz input, such as a PAL system, or a 5-to-6 ratio for a 72 hertz input. The color wheel is maintained at about a 60 hertz rate.
Inventors
- 👤 Dan Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:07
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3102; H04N9/312; G; G02; G02B; G02B26/00; G02B26/007; G02B26/008; H02; H02P; H02P23/00; H02P23/18; H04N9/3111; H04N9/3114; G09; G09G; G09G2340/00; G09G2340/04; G09G2340/0407; G09G2340/0435; G09G2340/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
157 words
A display system, comprising: a spatial light modulator; a light source providing light; a color wheel rotating at a wheel rate and coloring said light, said colored light illuminating said spatial light modulator; a logic circuit having an input receiving frames of data at a frame rate and communicating said data to said spatial light modulator; and a control circuit detecting said frame rate, responsive to a vertical sync rate corresponding to said frame rate, and providing a wheel motor sync output at a rate as a function of said vertical sync rate of said frames of data, said sync output rate being unequal to said vertical sync rate when said vertical sync rate deviates from a predetermined rate, said wheel rate being a function of said sync output, and adjusting said color wheel rate so that said wheel rate compared to said frame rate is a ratio of integers, said integer ratio being other than one-to-one.
Claim 2
Dependent Claim
157 words
A display system, comprising: a spatial light modulator; a light source providing light; a color wheel rotating at a wheel rate and coloring said light, said colored light illuminating said spatial light modulator; a logic circuit having an input receiving frames of data at a frame rate and communicating said data to said spatial light modulator; and a control circuit detecting said frame rate, responsive to a vertical sync rate corresponding to said frame rate, and providing a wheel motor sync output at a rate as a function of said vertical sync rate of said frames of data, said sync output rate being unequal to said vertical sync rate when said vertical sync rate deviates from a predetermined rate, said wheel rate being a function of said sync output, and adjusting said color wheel rate so that said wheel rate compared to said frame rate is a ratio of integers, said integer ratio being other than one-to-one.
Claim 3
Dependent Claim
45 words
The display system as specified in claim 1 wherein said color wheel has a plurality of colored segments, wherein each said colored segment, but one or more, is illuminated for each said frame of data when said frame rate is less than said wheel rate.
Claim 4
Dependent Claim
45 words
The display system as specified in claim 1 wherein said color wheel has a plurality of colored segments, wherein at least one said colored segment is illuminated one more time than said other colored segments when said frame rate is greater than said wheel rate.
Claim 5
Dependent Claim
50 words
The display system as specified in claim 1 wherein said color wheel has multiple colored segments, wherein each said colored segment except one or more is illuminated equally in time for each said frame of data by said light source when said frame rate is less than said wheel rate.
Claim 6
Dependent Claim
50 words
The display system as specified in claim 1 wherein said color wheel has multiple colored segments, wherein each said colored segment except one or more is illuminated equally in time for each said frame of data by said light source when said frame rate is greater than said wheel rate.
Claim 7
Dependent Claim
39 words
The display system as specified in claim 1 wherein said color wheel has n colored segments, wherein no more than n-1 said segments are illuminated each said data frame when said frame rate is less than said wheel rate.
Claim 8
Dependent Claim
38 words
The display system as specified in claim 1 wherein said color wheel has n colored segments, wherein at least n+1 said segments are illuminated each said data frame when said frame rate is greater than said wheel rate.
Claim 9
Dependent Claim
31 words
The display system as specified in claim 1 wherein the ratio of said frame rate to said wheel rate is 7-to-6 when said frame rate is less than said wheel rate.
Claim 10
Dependent Claim
31 words
The display system as specified in claim 1 wherein the ratio of said frame rate to said wheel rate is 5-to-6 when said frame rate is greater than said wheel rate.
Claim 11
Dependent Claim
30 words
The display system as specified in claim 1 wherein said sync output rate is identical to said vertical sync rate when said frame rate is identical to said predetermined rate.
Claim 12
Independent Claim
159 words
The method of operating a sequential display system, comprising: a) utilizing a color wheel having a plurality of colored segments to color source light illuminating a spatial light modulator, said color wheel rotating at a wheel rate; b) modulating said colored light with said spatial light modulator according to frames of data received at a frame rate; and c) controlling said wheel rate by responding to a vertical sync rate corresponding to said frame rate, and providing a wheel motor sync output at a rate as a function of said vertical sync rate of said frames of data, said sync output rate being unequal to said vertical sync rate when said vertical sync rate deviates from a predetermined rate, said wheel rate being a function of said sync output, and adjusting said color wheel rate so that said wheel rate compared to said frame rate is a ratio of integers, wherein said ratio of integers is other than one-to-one.
Claim 13
Independent Claim
159 words
The method of operating a sequential display system, comprising: a) utilizing a color wheel having a plurality of colored segments to color source light illuminating a spatial light modulator, said color wheel rotating at a wheel rate; b) modulating said colored light with said spatial light modulator according to frames of data received at a frame rate; and c) controlling said wheel rate by responding to a vertical sync rate corresponding to said frame rate, and providing a wheel motor sync output at a rate as a function of said vertical sync rate of said frames of data, said sync output rate being unequal to said vertical sync rate when said vertical sync rate deviates from a predetermined rate, said wheel rate being a function of said sync output, and adjusting said color wheel rate so that said wheel rate compared to said frame rate is a ratio of integers, wherein said ratio of integers is other than one-to-one.
Claim 14
Dependent Claim
18 words
The method as specified in claim 11 wherein said color wheel has at least six said colored segments.
Claim 15
Dependent Claim
35 words
The method as specified in claim 11 wherein a transition time between said frames of data occurs when a transition between said wheel colored segments is at a predetermined position relative to said source light.
Claim 16
Dependent Claim
24 words
The method as specified in claim 13 wherein said predetermined position is such that said source light illuminates said transition between said colored segments.
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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) | 2002-12-13 | 2003-06-14 | 2003-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-12-13 | 2007-06-14 | 2007-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-12-13 | 2011-06-14 | 2011-12-14 | $7700.00 | Window Closed / Lapsed |