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1. WO2008021818 - SYSTEM AND METHOD FOR DRIVING A LIQUID CRYSTAL DISPLAY TO REDUCE AUDIBLE NOISE LEVELS

Publication Number WO/2008/021818
Publication Date 21.02.2008
International Application No. PCT/US2007/075345
International Filing Date 07.08.2007
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 2310/0254
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
0254Control of polarity reversal in general, other than for liquid crystal displays
G09G 2330/021
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2330Aspects of power supply; Aspects of display protection and defect management
02Details of power systems and of start or stop of display operation
021Power management, e.g. power saving
G09G 2330/06
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2330Aspects of power supply; Aspects of display protection and defect management
06Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
G09G 3/3655
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
3655Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
Applicants
  • MOTOROLA INC. [US]/[US] (AllExceptUS)
  • FOO, Ken K. [US]/[US] (UsOnly)
  • KAEHLER, John W. [US]/[US] (UsOnly)
  • ZHUANG, Zhiming [US]/[US] (UsOnly)
Inventors
  • FOO, Ken K.
  • KAEHLER, John W.
  • ZHUANG, Zhiming
Agents
  • VAAS, Randall S., Mobile D
Priority Data
11/501,98209.08.2006US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) SYSTEM AND METHOD FOR DRIVING A LIQUID CRYSTAL DISPLAY TO REDUCE AUDIBLE NOISE LEVELS
(FR) SYSTÈME ET PROCÉDÉ DESTINÉS À CONTRÔLER UN AFFICHAGE À CRISTAUX LIQUIDES POUR RÉDUIRE LES NIVEAUX DE BRUIT AUDIBLE
Abstract
(EN)
A system and a method are provided for driving a liquid crystal display (LCD) (30) in manner to reduce audible noise therefrom. A video display system (18) includes a thin film transistor liquid crystal display panel (32) having a plurality of gate electrodes (56), a plurality of source electrodes (58), and a common electrode (62). A common electrode function generator (40) is provided to generate a voltage waveform to drive the common electrode at a plurality of frequencies.
(FR)
Le système et le procédé fournis permettent de contrôler un affichage à cristaux liquides (LCD) (30) de manière à réduire le bruit audible de celui-ci. Un système d'affichage vidéo (18) comprend un panneau d'affichage à cristaux liquides à matrice active (32) ayant une pluralité d'électrodes grille (56), une pluralité d'électrodes source (58), et une électrode de référence (62). Un générateur de fonction d'électrode de référence (40) permet de générer une forme d'onde de tension pour contrôler l'électrode de référence à une pluralité de fréquences.
Also published as
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