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1. WO2000043979 - APPARATUS AND METHOD FOR MAKING A GRAY SCALE DISPLAY WITH SUBFRAMES

Publication Number WO/2000/043979
Publication Date 27.07.2000
International Application No. PCT/JP2000/000193
International Filing Date 18.01.2000
IPC
G09G 3/20 2006.01
GPHYSICS
09EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
20for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix
G09G 3/28 2013.01
GPHYSICS
09EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
20for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix
22using controlled light sources
28using luminous gas-discharge panels, e.g. plasma panels
G09G 3/34 2006.01
GPHYSICS
09EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
20for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix
34by control of light from an independent source
CPC
G09G 2320/0261
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2320Control of display operating conditions
02Improving the quality of display appearance
0261in the context of movement of objects on the screen or movement of the observer relative to the screen
G09G 2320/0266
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2320Control of display operating conditions
02Improving the quality of display appearance
0266Reduction of sub-frame artefacts
G09G 2320/0276
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2320Control of display operating conditions
02Improving the quality of display appearance
0271Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
0276for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
G09G 2320/106
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2320Control of display operating conditions
10Special adaptations of display systems for operation with variable images
106Determination of movement vectors or equivalent parameters within the image
G09G 3/2022
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
20for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix ; no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
2007Display of intermediate tones
2018by time modulation using two or more time intervals
2022using sub-frames
G09G 3/2044
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
20for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix ; no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
2007Display of intermediate tones
2044using dithering
Applicants
  • MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. [JP/JP]; 1006, Oaza Kadoma Kadoma-shi, Osaka 571-8501, JP (AllExceptUS)
  • KASAHARA, Mitsuhiro [JP/JP]; JP (UsOnly)
  • ISHIKAWA, Yuichi [JP/JP]; JP (UsOnly)
  • MORITA, Tomoko [JP/JP]; JP (UsOnly)
Inventors
  • KASAHARA, Mitsuhiro; JP
  • ISHIKAWA, Yuichi; JP
  • MORITA, Tomoko; JP
Agents
  • AOYAMA, Tamotsu ; Aoyama & Partners Imp Building, 3-7, Shiromi 1-chome, Chuo-ku Osaka-shi, Osaka 540-0001, JP
Priority Data
11/1444622.01.1999JP
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) APPARATUS AND METHOD FOR MAKING A GRAY SCALE DISPLAY WITH SUBFRAMES
(FR) APPAREIL ET PROCEDE PERMETTANT DE REALISER L'AFFICHAGE D'UNE ECHELLE DE GRIS AU MOYEN DE SOUS-ZONES
Abstract
(EN)
The invention provides an apparatus and a method applied to a plasma display panel or other display panel, achieving a gray scale display by using a plurality of weighted subfields. The apparatus comprises a gray scale limiting/difference diffusion circuit (17) for converting gray scale levels in a supplied image signal to specific gray scale levels that do not easily create pseudo contours in moving picture areas and to intermediate gray scale levels between the specific gray scale levels, and diffusing the difference between the converted gray scale level and the original gray scale level to adjacent pixels, and a dither circuit (19) for generating a video signal to display the converted gray scale level from the circuit (17) alternately in even and odd fields. The dither circuit (19) generates the video signal in which the gray scale levels offset the dither level above and below the dithered gray scale are alternately presented when the converted gray scale level is a dithered gray scale.
(FR)
L'invention concerne un appareil et un procédé appliqué à un écran à plasma ou à un autre écran, permettant de réaliser l'affichage d'une échelle de gris à l'aide d'une pluralité de sous-zones pondérées. Cet appareil comprend un circuit de diffusion (17) de limitation/différence d'échelle de gris, qui permet de convertir des niveaux d'échelle de gris dans un signal d'image fournie, en des niveaux d'échelle de gris qui ne créent pas facilement de pseudo-contours dans des zones d'images en mouvement, et en des niveaux d'échelle de gris intermédiaires entre les niveaux d'échelle de gris spécifiques, et de diffuser la différence entre le niveau d'échelle de gris converti et le niveau d'échelle de gris original à des pixels adjacents; et un circuit de juxtaposition (19) destiné à produire un signal vidéo permettant d'afficher le niveau d'échelle de gris converti à partir du circuit de limitation/différence (17) alternativement en zones paire et impaire. Ce circuit de juxtaposition (19) produit le signal vidéo dans lequel les niveaux d'échelle de gris, qui décalent le niveau de juxtaposition au-dessus ou en-dessous de l'échelle de gris de juxtaposition, sont alternativement présentés lorsque le niveau de l'échelle de gris convertie est un niveau d'échelle de gris de juxtaposition.
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