Patent US6762743B2 successfully refreshed from Google Patents.
US6762743B2
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Display device employing a field-sequential method
Assignee: Fujitsu Ltd
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Filing: 2001-12-18
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Granted: 2004-07-13
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Expires: 2021-12-18
Abstract
Abstract In a display device employing a field-sequential method, a judgement whether display data is motion picture data or still picture data is made, and the frame number per second is increased for the display of a motion picture during which color break easily occurs by the movement of the line of sight of a user, while the frame number is made smaller than that for the display of a motion picture, for the display of a still picture during which color break hardly occurs. Further, the temperature of a liquid crystal panel is detected, and the frame number per second is increased so as to reduce color break when the result of the detection is not lower than a predetermined temperature, while, the frame number is decreased so as to enable display at low temperature when the result of the detection is lower than the predetermined temperature.
Inventors
- 👤 Toshiaki Yoshihara
- 👤 Keiichi Betsui
- 👤 Tetsuya Makino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:59
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/3406; G09G3/36; G09G3/3611; H; H05; H05B; H05B47/00; G09G2310/00; G09G2310/02; G09G2310/0235; G09G2320/00; G09G2320/04; G09G2320/041; G09G2320/06; G09G2320/0613; G09G2320/062; G09G2320/10; G09G2320/103; G09G2340/00; G09G2340/04; G09G2340/0407; G09G2340/0435; G09G3/3648; G09G3/3651; H05B45/00; H05B45/10; H05B45/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
173 words
A display device employing a field-sequential method, comprising: a light source having a plurality of colors of emitted light; a light emission switching unit for sequentially switching the plurality of colors of emitted light of said light source within one frame; a light switching element for controlling an intensity of light from said light source for display; a control unit for controlling synchronization of a light-emission timing of each color of emitted light of said light source and a switching of said light switching element; and a frame number changing unit for changing a frame number per unit time; wherein said control unit controls the synchronization of the light emission timing and the switching in accordance with the frame number changed by said frame number changing unit, wherein said frame number changing unit comprises a discrimination circuit for judging whether display data is motion picture data or still picture data, and a changing circuit for changing the frame number per unit time based on a result of the judgement by said discrimination circuit.
Claim 2
Dependent Claim
173 words
A display device employing a field-sequential method, comprising: a light source having a plurality of colors of emitted light; a light emission switching unit for sequentially switching the plurality of colors of emitted light of said light source within one frame; a light switching element for controlling an intensity of light from said light source for display; a control unit for controlling synchronization of a light-emission timing of each color of emitted light of said light source and a switching of said light switching element; and a frame number changing unit for changing a frame number per unit time; wherein said control unit controls the synchronization of the light emission timing and the switching in accordance with the frame number changed by said frame number changing unit, wherein said frame number changing unit comprises a discrimination circuit for judging whether display data is motion picture data or still picture data, and a changing circuit for changing the frame number per unit time based on a result of the judgement by said discrimination circuit.
Claim 3
Dependent Claim
33 words
The display device of claim 1 , wherein when the display data is motion picture data, the frame number per unit time is increased compared with the frame number for still picture data.
Claim 4
Dependent Claim
18 words
The display device of claim 1 , wherein said light switching element is a liquid crystal display element.
Claim 5
Dependent Claim
21 words
The display device of claim 3 , wherein said liquid crystal display element includes a liquid crystal material having spontaneous polarization.
Claim 6
Dependent Claim
27 words
The display device of claim 3 , wherein said liquid crystal display element comprises an active element corresponding to each of a plurality of liquid crystal pixels.
Claim 7
Dependent Claim
27 words
The display device of claim 4 , wherein said liquid crystal display element comprises an active element corresponding to each of a plurality of liquid crystal pixels.
Claim 8
Dependent Claim
104 words
A field-sequential display method for displaying a color image by sequentially switching a plurality of colors of emitted light of a light source within one frame and by synchronizing a light-emission timing of each color of emitted light with a switching of a light switching element for controlling an intensity of light from said light source for display, comprising: judging whether image data is motion picture data or still picture data; and changing a frame number per unit time based on a result of the judgement; and controlling the synchronization of the light-emission timing and the switching in accordance with the changed frame number.
Claim 9
Dependent Claim
104 words
A field-sequential display method for displaying a color image by sequentially switching a plurality of colors of emitted light of a light source within one frame and by synchronizing a light-emission timing of each color of emitted light with a switching of a light switching element for controlling an intensity of light from said light source for display, comprising: judging whether image data is motion picture data or still picture data; and changing a frame number per unit time based on a result of the judgement; and controlling the synchronization of the light-emission timing and the switching in accordance with the changed frame number.
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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) | 2007-07-13 | 2008-01-12 | 2008-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-07-13 | 2012-01-12 | 2012-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-07-13 | 2016-01-12 | 2016-07-13 | $7700.00 | Window Closed / Lapsed |