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1. WO2001059750 - IMAGE DISPLAY

Publication Number WO/2001/059750
Publication Date 16.08.2001
International Application No. PCT/JP2000/000748
International Filing Date 10.02.2000
Chapter 2 Demand Filed 22.03.2000
IPC
G09G 3/36 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
36using liquid crystals
CPC
G09G 2310/0251
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2310Command of the display device
02Addressing, scanning or driving the display screen or processing steps related thereto
0243Details of the generation of driving signals
0251Precharge or discharge of pixel before applying new pixel voltage
G09G 2310/027
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2310Command of the display device
02Addressing, scanning or driving the display screen or processing steps related thereto
0264Details of driving circuits
027Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
G09G 2310/0291
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2310Command of the display device
02Addressing, scanning or driving the display screen or processing steps related thereto
0264Details of driving circuits
0291Details of output amplifiers or buffers arranged for use in a driving circuit
G09G 2310/0297
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2310Command of the display device
02Addressing, scanning or driving the display screen or processing steps related thereto
0264Details of driving circuits
0297Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns
G09G 2320/0233
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
0233Improving the luminance or brightness uniformity across the screen
G09G 3/2011
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
2011by amplitude modulation
Applicants
  • HITACHI, LTD. [JP]/[JP] (AllExceptUS)
  • AKIMOTO, Hajime [JP]/[JP] (UsOnly)
  • MIKAMI, Yoshiro [JP]/[JP] (UsOnly)
Inventors
  • AKIMOTO, Hajime
  • MIKAMI, Yoshiro
Agents
  • SAKUTA, Yasuo
Priority Data
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) IMAGE DISPLAY
(FR) AFFICHEUR D'IMAGES
Abstract
(EN)
A liquid crystal image display comprising differential amplifiers composed of polycrystalline SiTFTs incorporated in buffer (20) for a signal line driver. The image display includes buffer outputting switches (16) for turning off the outputs of the buffers (20) and signal line shunting switches (17) for shorting the input and output terminals of the buffer (20). For the first half of one horizontal period, the signal line shunting switches (17) are held off whereas the buffer outputting switches (16) are held on, to feed signal lines (7) with an image signal voltage selected by gradation selecting switches (3) through the buffers (20). For the second half of the horizontal period, the signal line shunting switches (17) are held on whereas the buffer outputting switches (16) are held off, to feed the signal lines (7) directly with the image signal voltage selected by the gradation selecting switches (3), and the signal lines (7) fed with the equal image signal voltages are shorted to prevent the brightness nonuniformity of vertical streaks, as might otherwise be caused because said buffers (20) have different offset voltages.
(FR)
L'invention concerne un afficheur d'images à cristaux liquides comprenant des amplificateurs différentiels composés de SiTFT polycristallins incorporés dans un tampon (20) pour circuit d'attaque de lignes de signal. Ledit afficheur d'images comporte des commutateurs (16) de sortie de tampon destinés à la mise hors circuit de la sortie des tampons (20) et des commutateurs (17) de dérivation de lignes de signal destinés à raccourcir la distance entre les bornes d'entrée et de sortie du tampon (20). Sur la première moitié d'une période horizontale, les commutateurs (17) de dérivation de lignes de signal sont maintenus hors circuit alors que les commutateurs (16) de sortie de tampon sont maintenus en circuit, de manière à alimenter les lignes (7) de signal avec une tension de signal d'image sélectionnée par des commutateurs (3) de sélection de gradation via les tampons (20). Sur la seconde moitié de la période horizontale, les commutateurs (17) de dérivation de ligne de signal sont maintenus sous tension tandis que les commutateurs (16) de sortie de tampon sont maintenus hors circuit, de manière à alimenter les lignes (7) de signal directement avec la tension de signal d'image sélectionnée par les commutateurs (3) de sélection de gradation. Ainsi, les lignes (7) de signal alimentées au moyen de tensions de signal d'image équivalentes sont raccourcies, ce qui permet d'éviter la non-uniformité de brillance des bandes verticales susceptible de se produire du fait que lesdits tampons (20) ont des tensions de décalage différentes.
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