Patent US6570554B1 successfully refreshed from Google Patents.
US6570554B1
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US
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Liquid crystal display
Assignee: Fujitsu Ltd
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Filing: 2000-09-08
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Granted: 2003-05-27
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Expires: 2020-09-08
Abstract
Abstract A liquid crystal display in which: after a back-light has emitted three-color light rays of red, green and blue sequentially color by color, the back-light is turned off for a predetermined time, or the back-light is controlled so that, in three consecutive frames, the orders of light emissions of the respective colors carried out in respective sub-frames are not coincident with each other, thereby to reduce degradation in the image quality that occurs at the outline portion of an animation picture when it is displayed.
Inventors
- 👤 Tetsuya Makino
- 👤 Toshiaki Yoshihara
- 👤 Hironori Shiroto
- 👤 Yoshinori Kiyota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:02
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/3406; G09G3/3413; G09G3/36; G09G3/3611; G09G3/3648; G09G3/3651; G09G2310/00; G09G2310/02; G09G2310/0235; G09G2310/06; G09G2310/061; G09G2320/00; G09G2320/02; G09G2320/0261; G09G3/3614
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
79 words
A liquid crystal display comprising: a liquid crystal panel having a plurality of liquid crystal pixel electrodes arranged in a matrix form; a back-light, placed on the rear face of the liquid crystal panel, for emitting at least three color light rays; and a back-light control circuit which allows the back-light to emit at least three color light rays sequentially color by color so as to differentiate the order of the light emissions within at least three consecutive frames.
Claim 2
Dependent Claim
79 words
A liquid crystal display comprising: a liquid crystal panel having a plurality of liquid crystal pixel electrodes arranged in a matrix form; a back-light, placed on the rear face of the liquid crystal panel, for emitting at least three color light rays; and a back-light control circuit which allows the back-light to emit at least three color light rays sequentially color by color so as to differentiate the order of the light emissions within at least three consecutive frames.
Claim 3
Dependent Claim
221 words
A liquid crystal display comprising: a liquid crystal panel having a plurality of liquid crystal pixel electrodes arranged in a matrix form and a plurality of switching elements placed correspondingly to the respective liquid crystal pixel electrodes; a back-light, placed on the rear face of the liquid crystal panel, having light sources of three colors; and a light-source driving control circuit for controlling the driving processes of the respective light sources of the back-light, by allowing the back-light to emit light rays sequentially color by color in synchronism with three color display data in one frame, applied to the respective liquid crystal pixel electrodes, while driving the switching elements to turn ON/OFF corresponding to the display data, so as to carry out a color display, wherein the light-source driving control circuit controls the driving processes of the respective light sources so that, in each frame within consecutive three frames, among a first light-emitting order including the first, second and third colors in this order, a second light-emitting order including the second, third and first colors in this order, and a third light-emitting order including the third, first and second colors in this order, the respective light sources are driven in such a manner that the light-emitting order of each frame is different from the light-emitting orders of the other two frames.
Claim 4
Dependent Claim
221 words
A liquid crystal display comprising: a liquid crystal panel having a plurality of liquid crystal pixel electrodes arranged in a matrix form and a plurality of switching elements placed correspondingly to the respective liquid crystal pixel electrodes; a back-light, placed on the rear face of the liquid crystal panel, having light sources of three colors; and a light-source driving control circuit for controlling the driving processes of the respective light sources of the back-light, by allowing the back-light to emit light rays sequentially color by color in synchronism with three color display data in one frame, applied to the respective liquid crystal pixel electrodes, while driving the switching elements to turn ON/OFF corresponding to the display data, so as to carry out a color display, wherein the light-source driving control circuit controls the driving processes of the respective light sources so that, in each frame within consecutive three frames, among a first light-emitting order including the first, second and third colors in this order, a second light-emitting order including the second, third and first colors in this order, and a third light-emitting order including the third, first and second colors in this order, the respective light sources are driven in such a manner that the light-emitting order of each frame is different from the light-emitting orders of the other two frames.
Claim 5
Dependent Claim
110 words
A liquid crystal display, comprising: a liquid crystal panel having a plurality of liquid crystal pixel electrodes arranged in a matrix form; a back-light, placed on the rear face of a liquid crystal panel, for emitting a plurality of different color light rays sequentially color by color; and a back-light control circuit which emits the back-light sequentially color by color, and turns the back-light off for a predetermined time cyclically, wherein the back-light control circuit allows the plurality of different color light rays of the back-light to be emitted sequentially color by color so as not to have the same light-emitting order of colors in the consecutive plurality of frames.
Claim 6
Dependent Claim
110 words
A liquid crystal display, comprising: a liquid crystal panel having a plurality of liquid crystal pixel electrodes arranged in a matrix form; a back-light, placed on the rear face of a liquid crystal panel, for emitting a plurality of different color light rays sequentially color by color; and a back-light control circuit which emits the back-light sequentially color by color, and turns the back-light off for a predetermined time cyclically, wherein the back-light control circuit allows the plurality of different color light rays of the back-light to be emitted sequentially color by color so as not to have the same light-emitting order of colors in the consecutive plurality of frames.
Claim 7
Dependent Claim
259 words
A liquid crystal display comprising: a liquid crystal panel having a plurality of liquid crystal pixel electrodes arranged in a matrix form and a plurality of switching elements placed correspondingly to the respective liquid crystal pixel electrodes; a back-light, placed on the rear face of the liquid crystal panel, having light sources of three colors; and a light-source driving control circuit for controlling the driving processes of the respective light sources of the back-light, by allowing the back-light to emit light rays sequentially color by color in synchronism with three color display data in one frame, applied to the respective liquid crystal pixel electrodes, while driving the switching elements to turn ON/OFF corresponding to the display data, so as to carry out a color display, wherein the light-source driving control circuit controls the driving processes of the respective light sources so that, in each frame within consecutive three frames, among a first light-emitting order including the first, second and third colors in this order, a second light-emitting order including the second, third and first colors in this order, and a third light-emitting order including the third, first and second colors in this order, the respective light sources are driven in such a manner that the light-emitting order of each frame is different from the light-emitting orders of the other two frames, the driving processes of the respective light sources being controlled so that, in each of the frames, after the period for driving the third light source, a turn-off period for turning all the light sources off is provided.
Claim 8
Dependent Claim
259 words
A liquid crystal display comprising: a liquid crystal panel having a plurality of liquid crystal pixel electrodes arranged in a matrix form and a plurality of switching elements placed correspondingly to the respective liquid crystal pixel electrodes; a back-light, placed on the rear face of the liquid crystal panel, having light sources of three colors; and a light-source driving control circuit for controlling the driving processes of the respective light sources of the back-light, by allowing the back-light to emit light rays sequentially color by color in synchronism with three color display data in one frame, applied to the respective liquid crystal pixel electrodes, while driving the switching elements to turn ON/OFF corresponding to the display data, so as to carry out a color display, wherein the light-source driving control circuit controls the driving processes of the respective light sources so that, in each frame within consecutive three frames, among a first light-emitting order including the first, second and third colors in this order, a second light-emitting order including the second, third and first colors in this order, and a third light-emitting order including the third, first and second colors in this order, the respective light sources are driven in such a manner that the light-emitting order of each frame is different from the light-emitting orders of the other two frames, the driving processes of the respective light sources being controlled so that, in each of the frames, after the period for driving the third light source, a turn-off period for turning all the light sources off is provided.
Claim 9
Dependent Claim
21 words
The liquid crystal display according to claim 4 wherein the turn-off period is set to be approximately a ¼ frame time.
Claim 10
Dependent Claim
22 words
The liquid crystal display according to claim 5 , wherein the turn-off period is set to be approximately a ½ frame time.
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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) | 2006-05-26 | 2006-11-25 | 2007-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-05-26 | 2010-11-25 | 2011-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-05-26 | 2014-11-25 | 2015-05-27 | $7700.00 | Window Closed / Lapsed |