US20050105008A1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for displaying a video image on a digital display device
Assignee: InterDigital CE Patent Holdings SAS
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Filing: 2003-03-07
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Granted: —
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Expires: 2023-03-07
Abstract
Abstract The present invention relates to a method for displaying a video image on a digital display device during a video frame comprising at least two distinct time segments for displaying a grey level. The cells of the device are able to take selectively an on state or an off state. The cells are able moreover to change state several times during a video frame. According to the invention, the cells change state at most once during each time segment of the video frame. The invention makes it possible to attenuate or suppress disturbances related to the temporal integration and to the sequential displaying of the R, G, B components of the video image.
Inventors
- 👤 Didier Doyen
- 👤 Thierry Borel
- 👤 Jonathan Kervec
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:50
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/3433; G09G3/346; H04N5/00; H04N5/30; G09G2310/00; G09G2310/02; G09G2310/0235; G09G2320/00; G09G2320/02; G09G2320/0266; G09G2320/0271; G09G2320/0276; G09G3/2007; G09G3/2014; G09G3/2018; G09G3/2022
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
84 words
1 . Method for displaying a video image on a digital display device during a video frame comprising at least two distinct time segments for displaying a grey level, said digital display device comprising a plurality of cells, each cell being able to take selectively an on state or an off state, each cell being able moreover to change state several times during a video frame, characterized in that each cell changes state at most once during each time segment of the video frame.
Claim 2
Dependent Claim
84 words
1 . Method for displaying a video image on a digital display device during a video frame comprising at least two distinct time segments for displaying a grey level, said digital display device comprising a plurality of cells, each cell being able to take selectively an on state or an off state, each cell being able moreover to change state several times during a video frame, characterized in that each cell changes state at most once during each time segment of the video frame.
Claim 3
Dependent Claim
50 words
2 . Method according to claim 1 , characterized in that the displaying of a video image is carried out by the sequential displaying of three images of red, green and blue colour, respectively, and in that the video frame comprises at least two non-consecutive time segments for each colour.
Claim 4
Dependent Claim
45 words
3 . Method according to claim 1 or 2 , characterized in that each time segment comprises a plurality of consecutive subperiods, called subfields, of different durations and during each of which each cell is either in an on state, or in an off state.
Claim 5
Dependent Claim
28 words
4 . Method according to claim 3 , characterized in that, for one and the same colour, said at least two time segments comprise different pluralities of subfields.
Claim 6
Dependent Claim
52 words
5 . Method according to claim 3 or 4 , characterized in that, for each colour, the duration of the subfields of said at least two time segments is determined in such a way that the duration of the on state of the cells increases according to an inverse gamma correction curve.
Claim 7
Dependent Claim
41 words
6 . Method according to one of claims 3 to 5 , characterized in that the total duration of the subfields of each time segment is substantially equal to a predetermined value common to all said at least two time segments.
Claim 8
Dependent Claim
88 words
7 . Device for the digital displaying of a video image during a video frame comprising at least two distinct time segments for displaying a grey level, said digital display device comprising a plurality of cells, each cell being able to take selectively an on state or an off state, each cell being able moreover to change state several times during a video frame, characterized in that it comprises means for changing the state of the cells at most once during each time segment of the video frame.
Claim 9
Dependent Claim
88 words
7 . Device for the digital displaying of a video image during a video frame comprising at least two distinct time segments for displaying a grey level, said digital display device comprising a plurality of cells, each cell being able to take selectively an on state or an off state, each cell being able moreover to change state several times during a video frame, characterized in that it comprises means for changing the state of the cells at most once during each time segment of the video frame.
Claim 10
Dependent Claim
38 words
8 . Device according to claim 7 , comprising means for sequentially displaying three images of red, green and blue colour, respectively, characterized in that the video frame comprises at least two non-consecutive time segments for each colour.
Claim 11
Dependent Claim
95 words
9 . Device according to one of claims 7 or 8 , characterized in that it comprises a digital matrix of micromirrors, each cell of said device being associated with a micromirror, and in that the cells of said device are in an on state when the associated micromirrors are in an active position in which it contributes to the projection of light onto a screen of the device and are in an off state when the associated micromirrors are in a passive position in which it prevents said projection of light onto said screen.
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