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1. WO2020200164 - A SELECTIVELY ERASABLE LIQUID CRYSTAL WRITING BOARD

Publication Number WO/2020/200164
Publication Date 08.10.2020
International Application No. PCT/CN2020/082061
International Filing Date 30.03.2020
IPC
G02F 1/1333 2006.01
GPHYSICS
02OPTICS
FDEVICES 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
1Devices 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
01for the control of the intensity, phase, polarisation or colour
13based on liquid crystals, e.g. single liquid crystal display cells
133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
1333Constructional arrangements
G02F 1/1339 2006.01
GPHYSICS
02OPTICS
FDEVICES 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
1Devices 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
01for the control of the intensity, phase, polarisation or colour
13based on liquid crystals, e.g. single liquid crystal display cells
133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
1333Constructional arrangements
1339Gaskets; Spacers; Sealing of cells
G02F 1/1343 2006.01
GPHYSICS
02OPTICS
FDEVICES 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
1Devices 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
01for the control of the intensity, phase, polarisation or colour
13based on liquid crystals, e.g. single liquid crystal display cells
133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
1333Constructional arrangements
1343Electrodes
G02F 1/1334 2006.01
GPHYSICS
02OPTICS
FDEVICES 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
1Devices 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
01for the control of the intensity, phase, polarisation or colour
13based on liquid crystals, e.g. single liquid crystal display cells
133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
1333Constructional arrangements
1334based on polymer-dispersed liquid crystals, e.g. microencapsulated liquid crystals
G06F 3/041 2006.01
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
FELECTRIC DIGITAL DATA PROCESSING
3Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
01Input arrangements or combined input and output arrangements for interaction between user and computer
03Arrangements for converting the position or the displacement of a member into a coded form
041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
Applicants
  • SMART LIQUID CRYSTAL TECHNOLOGIES CO., LTD. [CN]/[CN]
Inventors
  • XUE, Jiuzhi
  • LI, Dong
  • ZHANG, Wenge
Agents
  • BEIJING ARETE INTELLECTUAL PROPERTY AGENCY
Priority Data
201910264686.803.04.2019CN
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) A SELECTIVELY ERASABLE LIQUID CRYSTAL WRITING BOARD
(FR) TABLEAU D'ÉCRITURE À CRISTAUX LIQUIDES EFFAÇABLE DE MANIÈRE SÉLECTIVE
Abstract
(EN)
A selectively erasable liquid crystal writing board, wherein the liquid crystal writing board comprises: a first substrate(10), a first conductive layer(20), a functional layer(30), a liquid crystal layer(40), a second transparent conductive layer(50) and a second transparent substrate(60) stacked in sequence, wherein an external electric field can be applied to the selectively erasable liquid crystal writing board via the first conductive layer(20) and the second transparent conductive layer(50), wherein upon application of an external mechanical pressure on a selected area of the liquid crystal writing board, the fractional voltage across the functional layer(30) in the selected area is reduced, and the fractional voltage across the liquid crystal layer(40) in the selected area is increased to reach a threshold voltage required to switch the liquid crystal molecules in the liquid crystal layer(40) to a desired state. The selectively erasable liquid crystal writing board has advantages of a convenient operation, low cost and no erasing trace residue.
(FR)
L'invention concerne un tableau d'écriture à cristaux liquides effaçable de manière sélective, le tableau d'écriture à cristaux liquides comprenant : un premier substrat (10), une première couche conductrice (20), une couche fonctionnelle (30), une couche de cristaux liquides (40), une seconde couche conductrice transparente (50) et un second substrat transparent (60) empilés en séquence, un champ électrique externe pouvant être appliqué au tableau d'écriture à cristaux liquides sélectivement effaçable par l'intermédiaire de la première couche conductrice (20) et la seconde couche conductrice transparente (50), lors de l'application d'une pression mécanique externe sur une zone sélectionnée du tableau d'écriture à cristaux liquides, la tension fractionnelle à travers la couche fonctionnelle (30) dans la zone sélectionnée étant réduite, et la tension fractionnelle à travers la couche de cristaux liquides (40) dans la zone sélectionnée étant augmentée pour atteindre une tension de seuil requise pour commuter les molécules de cristaux liquides dans la couche de cristaux liquides (40) à un état souhaité. Le tableau d'écriture à cristaux liquides effaçable de manière sélective présente les avantages d'une opération pratique, d'un faible coût et d'aucun résidu de trace d'effacement.
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