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1. (EP0954841) DYNAMIC DRIVE METHODS AND APPARATUS FOR A BISTABLE LIQUID CRYSTAL DISPLAY

Office : European Patent Office
Application Number: 98920306 Application Date: 06.05.1998
Publication Number: 0954841 Publication Date: 10.11.1999
Publication Kind : B1
Prior PCT appl.: Application Number:US1998009259 ; Publication Number: Click to see the data
IPC:
G02F 1/133
G09G 3/00
G02F 1/137
G09G 3/20
G09G 3/36
G PHYSICS
02
OPTICS
F
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1
Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
01
for the control of the intensity, phase, polarisation or colour
13
based on liquid crystals, e.g. single liquid crystal display cells
133
Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
G PHYSICS
09
EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
G
ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3
Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
G PHYSICS
02
OPTICS
F
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1
Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
01
for the control of the intensity, phase, polarisation or colour
13
based on liquid crystals, e.g. single liquid crystal display cells
137
characterised by a particular electro- or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction, dynamic scattering
G PHYSICS
09
EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
G
ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3
Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
20
for 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
G PHYSICS
09
EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
G
ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3
Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
20
for 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
34
by control of light from an independent source
36
using liquid crystals
CPC:
G09G 3/3629
G02F 1/13718
G09G 3/2011
G09G 3/2014
G09G 3/3681
G09G 2300/0486
G09G 2310/0205
G09G 2310/06
G09G 2320/0209
Applicants: UNIV KENT STATE OHIO
Inventors: YANG DENG-KE
ZHU YANG-MING
HUANG XIAO-YANG
Priority Data: 08852319 07.05.1997 US
9809259 06.05.1998 US
Title: (DE) DYNAMISCHE ANTRIEBSVERFAHREN UND GERÄT FÜR EINE BISTABILE FLÜSSIGKRISTALLANZEIGE
(EN) DYNAMIC DRIVE METHODS AND APPARATUS FOR A BISTABLE LIQUID CRYSTAL DISPLAY
(FR) PROCEDES D'EXCITATION DYNAMIQUE ET APPAREIL POUR UN ECRAN A CRISTAUX LIQUIDES BISTABLE
Abstract: front page image
(EN) A flat-panel liquid crystal display (10). The display includes a flat sheet of bistable chiral nematic liquid crystal material activated by a drive circuit that individually controls the display state of multiple picture elements. The driver circuitry activates the liquid crystal domains with various drive schemes which have any number of different phases (300, 312, 318, and 320) to attain various addressing sequence times. At the end of each drive scheme, the texture of the liquid crystal material is allowed to provide either focal conic or twisted planar end states (320) across the two-dimensional array of picture elements. Each drive scheme employs at least a preparation phase (300) and a selection phase (318) to predispose the liquid crystal material to one of the end states.
(FR) Ecran plat à cristaux liquides qui comporte une feuille plate d'une matière à cristaux liquides nématiques chirale bistable activée par un circuit d'excitation qui commande individuellement l'état d'affichage d'élément d'image multiples. Le circuit d'excitation active les domaines de cristaux liquides à l'aide de divers processus d'excitation qui présentent un certain nombre de phases différentes pour parvenir à divers moments de séquence d'adressage. A la fin de chaque processus d'excitation, la texture de la matière à cristaux liquides peut prendre des états finaux qui sont soit coniques focaux, soit plans torsadés, sur l'ensemble à deux dimensions des éléments d'image. Chaque processus d'excitation comporte au moins une phase de préparation et une phase de sélection de manière à prédisposer la matière à cristaux liquides pour qu'elle adopte l'un des états finaux.
Also published as:
KR1020000022562JP2000514932 CN1231048AU1998072911WO/1998/050804