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1. WO2000038168 - FAST READOUT OF MULTIPLE DIGITAL BIT PLANES FOR DISPLAY OF GREYSCALE IMAGES

Publication Number WO/2000/038168
Publication Date 29.06.2000
International Application No. PCT/GB1999/004277
International Filing Date 16.12.1999
Chapter 2 Demand Filed 11.07.2000
IPC
G09G 3/20 2006.1
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 3/36 2006.1
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
36using liquid crystals
CPC
G02B 26/00
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
26Optical devices or arrangements using movable or deformable optical elements for controlling the intensity, colour, phase, polarisation or direction of light, e.g. switching, gating, modulating
G09G 2320/0247
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
0247Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
G09G 2320/0257
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
0257Reduction of after-image effects
G09G 3/2018
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
G09G 3/3648
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
34by control of light from an independent source
36using liquid crystals
3611Control of matrices with row and column drivers
3648using an active matrix
G09G 3/3651
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
34by control of light from an independent source
36using liquid crystals
3611Control of matrices with row and column drivers
3648using an active matrix
3651using multistable liquid crystals, e.g. ferroelectric liquid crystals
Applicants
  • THE SECRETARY OF STATE FOR DEFENCE [GB]/[GB] (AllExceptUS)
  • COKER, Timothy, Martin [GB]/[GB] (UsOnly)
  • CROSSLAND, William, Alden [GB]/[GB] (UsOnly)
Inventors
  • COKER, Timothy, Martin
  • CROSSLAND, William, Alden
Agents
  • GODDARD, David, John
Priority Data
9827944.119.12.1998GB
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) FAST READOUT OF MULTIPLE DIGITAL BIT PLANES FOR DISPLAY OF GREYSCALE IMAGES
(FR) LECTURE RAPIDE DE PLANS BINAIRES NUMERIQUES MULTIPLES POUR L'AFFICHAGE D'IMAGES EN NIVEAUX DE GRIS
Abstract
(EN) In a method of signal processing for greyscale imaging in which weighted bitplanes corresponding to a greyscale image are stored as binary strings in sequential locations in a memory, in decreasing order of intended duration (weighting), a number of read passes equal to the number of weighted bitplanes are made from the set of stored bitplanes, each pass commencing with the highest order bitplanes and continuing along the stored bitplanes in sequence, the lengths of the sequences being varied and selected such that at the end of the said number of read passes each bit plane has been read out a plurality of times proportional to or equal to its duration (weighting). The method has utility in driving high speed liquid crystal matrix arrays particularly where each bitplane needs to be refreshed. A small ac potential may be applied to the array between writing steps.
(FR) L'invention concerne une technique de traitement du signal destinée à l'imagerie en niveaux de gris, dans laquelle des plans binaires pondérés, correspondant à une image en niveau de gris, sont stockés en mémoire en tant que chaînes binaires à des emplacements séquentiels, par ordre décroissant de la durée attendue (pondération). A cet effet, on effectue un nombre de passages de lecture égale au nombre de plans binaires pondérés dans l'ensemble de plans binaires stockés. Chaque passage débute par les plans binaires de poids le plus élevé et se poursuit aux plans binaires stockés dans la séquence. On fait varier et on sélectionne la longueur des séquences de telle manière qu'après ledit nombre de passages de lecture, chaque plan binaire aura été lu un nombre de fois proportionnel ou égal à sa durée (pondération). Ce procédé convient dans le pilotage de matrices de cristaux liquides à grande vitesse, notamment lorsque chaque plan binaire a besoin d'être rafraîchi. Une faible tension CA peut être appliquée à la matrice entre les étapes d'écriture.
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