Patent US6054832A successfully refreshed from Google Patents.
US6054832A
Expired / Lapsed
US
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Electronically programmable color wheel
Assignee: Texas Instruments Inc
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Filing: 1998-05-27
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Granted: 2000-04-25
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Expires: 2018-05-27
Abstract
Abstract A display system using red, green, blue, and white light. The system derives data for the white portion of a color wheel or a white device from the red, green and blue data. The white portion of the color wheel is controlled as if it were another primary color on the wheel. Errors are prevented by a correction applied if the unfiltered light from the source has a different color temperature than the white light produced using the red, green and blue segments of the color wheel, or the devices for those colors. Analysis is performed on the data to determine if white light is necessary to be added to each frame of data.
Inventors
- 👤 Adam J. Kunzman
- 👤 Satyan R. Kalyandurg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:33
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3191; H04N9/3194; H04N9/3102; H04N9/3111; H04N9/3114
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
155 words
A color wheel module, comprising: a) a color wheel, said color wheel comprising multiple segments for transmitting filtered light, including a white segment; b) a motor for operating the color wheel at a predetermined rate; c) a motor controller for controlling the motor operation by determining the predetermined rate; d) a sensor operable to read an index mark on the color wheel, wherein said index mark allows the controller to know what state the color wheel is in; and e) nonvolatile memory storing calibration information concerning the white light lumens produced by a combination of said multiple segments excluding said white segment and the white light lumens produced by said white segment such that by reading said information from said nonvolatile memory, said display system can adjust operation of said display system to improve the relationship between white light produced by the combination of non-white segments and the white light produced by the white segment.
Claim 2
Dependent Claim
155 words
A color wheel module, comprising: a) a color wheel, said color wheel comprising multiple segments for transmitting filtered light, including a white segment; b) a motor for operating the color wheel at a predetermined rate; c) a motor controller for controlling the motor operation by determining the predetermined rate; d) a sensor operable to read an index mark on the color wheel, wherein said index mark allows the controller to know what state the color wheel is in; and e) nonvolatile memory storing calibration information concerning the white light lumens produced by a combination of said multiple segments excluding said white segment and the white light lumens produced by said white segment such that by reading said information from said nonvolatile memory, said display system can adjust operation of said display system to improve the relationship between white light produced by the combination of non-white segments and the white light produced by the white segment.
Claim 3
Dependent Claim
10 words
The module of claim 1, wherein said sensor is magnetic.
Claim 4
Dependent Claim
10 words
The module of claim 1, wherein said sensor is optical.
Claim 5
Dependent Claim
10 words
The module of claim 1, wherein said sensor is electromechanical.
Claim 6
Dependent Claim
12 words
The module of claim 1 wherein said nonvolatile memory is an EEPROM.
Claim 7
Dependent Claim
12 words
The module of claim 1 wherein said nonvolatile memory is an EPROM.
Claim 8
Dependent Claim
12 words
The module of claim 1 wherein said nonvolatile memory is a PAL.
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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) | 2003-04-25 | 2003-10-25 | 2004-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-04-25 | 2007-10-25 | 2008-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-04-25 | 2011-10-25 | 2012-04-25 | $7700.00 | Window Closed / Lapsed |