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1. EP4058843 - ELECTRODE STRUCTURE FOR CREATING ELECTRICAL POTENTIAL GRADIENT

Office
European Patent Office
Application Number 20899989
Application Date 08.12.2020
Publication Number 4058843
Publication Date 21.09.2022
Publication Kind A1
IPC
G02F 1/1333
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 1/1343
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
CPC
G02F 1/134309
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; ; Manufacturing methods
1343Electrodes
134309characterised by their geometrical arrangement
G02F 1/294
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
29for the control of the position or the direction of light beams, i.e. deflection
294Variable focal length devices
Applicants UNIV LAVAL
Inventors GALSTIAN TIGRAN
Designated States
Priority Data 201962945285 09.12.2019 US
202063068731 21.08.2020 US
Title
(DE) ELEKTRODENSTRUKTUR ZUM ERZEUGEN EINES ELEKTRISCHEN POTENZIALGRADIENTEN
(EN) ELECTRODE STRUCTURE FOR CREATING ELECTRICAL POTENTIAL GRADIENT
(FR) STRUCTURE D'ÉLECTRODE POUR CRÉER UN GRADIENT DE POTENTIEL ÉLECTRIQUE
Abstract
(EN) The present application relates to liquid crystal optical devices. It has been discovered that the problem of electric field discontinuity due to a discrete electrode arrangement in an LC-GRIN (or TLCL) optical device having a stepped voltage distribution in space can be solved by the use of phase shifted drive signals while using discrete shaped electrodes or by the use of a relatively high dielectric constant layer (HDCL), placed near the stepped electrode, which can "smoothen" the electric potential profile and reduce the artifacts due to the steps in electric field caused by the discrete turns or steps of the stepped electrode. Such HDCLs may be fabricated much easier compared to weakly conductive layers (WCLs).
(FR) La présente invention se rapporte aux dispositifs optiques à cristaux liquides. Il a été découvert que le problème de discontinuité de champ électrique dû à un agencement d'électrodes discrètes dans un dispositif optique LC-GRIN (ou TLCL) ayant une distribution de tension étagée dans l'espace peut être résolu par l'utilisation de signaux d'attaque déphasés tout en utilisant des électrodes en forme discrète ou par l'utilisation d'une couche à constante diélectrique relativement élevée (HDCL), placée à proximité de l'électrode étagée, qui peut "lisser" le profil de potentiel électrique et réduire les artéfacts dus aux étapes dans le champ électrique provoquées par les spires ou les étages discrets de l'électrode étagée. De telles HDCL peuvent être fabriquées beaucoup plus facilement par rapport à des couches faiblement conductrices (WCL).
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