EP3218447A1 - Cellule a cristal liquide cholesterique a reflectivite augmentee - Google Patents

Cellule a cristal liquide cholesterique a reflectivite augmentee

Info

Publication number
EP3218447A1
EP3218447A1 EP15807948.3A EP15807948A EP3218447A1 EP 3218447 A1 EP3218447 A1 EP 3218447A1 EP 15807948 A EP15807948 A EP 15807948A EP 3218447 A1 EP3218447 A1 EP 3218447A1
Authority
EP
European Patent Office
Prior art keywords
liquid crystal
wave plate
cholesteric liquid
substrates
cell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP15807948.3A
Other languages
German (de)
English (en)
French (fr)
Inventor
Laurent Dupont
Suman MANNA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nexter Systems SA
IMT Atlantique Bretagne
Original Assignee
Nexter Systems SA
IMT Atlantique Bretagne
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nexter Systems SA, IMT Atlantique Bretagne filed Critical Nexter Systems SA
Publication of EP3218447A1 publication Critical patent/EP3218447A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—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
    • G02F1/01—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 for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—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 for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137—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 for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/13718—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 for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/36—Steroidal liquid crystal compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/38—Polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—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
    • G02F1/01—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 for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—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 for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—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
    • G02F1/01—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 for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—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 for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—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
    • G02F1/01—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 for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—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 for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/13439—Electrodes characterised by their electrical, optical, physical properties; materials therefor; method of making
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—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
    • G02F1/01—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 for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—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 for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
    • C09K2019/521—Inorganic solid particles
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—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
    • G02F1/01—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 for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—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 for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13356—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements
    • G02F1/133565—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements inside the LC elements, i.e. between the cell substrates
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—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
    • G02F1/01—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 for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—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 for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G02F1/133638—Waveplates, i.e. plates with a retardation value of lambda/n
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—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
    • G02F1/01—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 for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—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 for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
    • G02F1/13478—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells based on selective reflection
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2203/00—Function characteristic
    • G02F2203/02—Function characteristic reflective
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
    • G02F2413/01—Number of plates being 1
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
    • G02F2413/05—Single plate on one side of the LC cell

Definitions

  • the technical field of the invention is that of reflective cells implementing cholesteric liquid crystals.
  • Cholesteric liquid crystals have the particularity of reflecting the incident light on a part of the visible spectrum which is determined by the type of chiral doping material associated with the liquid crystal. The other part of the spectrum is transmitted.
  • the cholesteric liquid crystal cells can thus be stacked on top of each other to form polychrome cells for reflecting a color which is a combination of at least two elementary colors.
  • cholesteric color screens comprising the assembly of elementary pixels which each comprise a stack of three cholesteric cells each corresponding to a primary color (red, green or blue).
  • Each cell of each elementary pixel is electronically controllable individually to control the reflection or transparency of said cell.
  • the pixels are fixed on an absorbing black background which makes it possible to avoid the return of light that has not been filtered by a pixel cell.
  • the control or the addressing of the cells of each pixel is carried out by active matrix, by passive matrix or by direct alphanumeric addressing.
  • a display device based on cholesteric liquid crystals a device for controlling the gray level of the cell in question.
  • This device comprises an intermediate layer which has a dielectric constant which is different (lower or higher) than that of the liquid crystal.
  • the intermediate layer makes it possible to create zones within the liquid crystal in which the electric field is stronger for a given voltage.
  • Such an arrangement makes it possible to modulate the reflectivity of the cell between different gray levels. However, it does not make it possible to increase the reflectivity of the cell.
  • This cell is simple in structure and low cost. Another object of the invention is to provide such a cell, reflecting 100% of the light received and having a small footprint.
  • the half-wave plate may be made of polyethylene (PE) or polyethylene terephthalate (PET).
  • PE polyethylene
  • PET polyethylene terephthalate
  • the half-wave plate may be covered on each of its faces by a deposit of a conductive material and optically transparent, the deposits being intended to be connected to the voltage source, so that an electric field can be placed between each substrate and the half wave plate.
  • the deposit of conductive material may consist of a deposit of ITO or PDOT-PSS.
  • Figure 1 schematically shows a cholesteric cell according to the prior art.
  • Figure 2 schematically shows a cholesteric cell according to a first embodiment of the invention.
  • Figure 3 schematically shows a cholesteric cell according to a second embodiment of the invention.
  • Figure 1 shows a cholesteric cell 1 according to the prior art.
  • This cell comprises two substrates 2a and 2b which are each covered on one of their faces by an electrode 3a or 3b.
  • the transparent conductive deposits 3a, 3b will for example consist of deposits associating indium oxide (In 2 0 3 ) and tin oxide (Sn0 2 ). Such a material is commonly referred to by the acronym ITO (Indium Tin Oxide).
  • the two electrodes 3a and 3b are connected to a voltage source 5, such as an electrical generator, which applies a voltage U between the electrodes 3a and 3b, which generates an electric field E between the two substrates 2a and 2b, therefore between the two surfaces delimiting the liquid crystal 8.
  • a voltage source 5 such as an electrical generator
  • planar and focal conic states are stable states in which the material remains in the absence of a field.
  • the homeotropic (transparent) state is an unstable state that requires the presence of the electric field.
  • the material goes from the homeotropic state to the planar state (maximum reflection coefficient).
  • the right or left helicity of the cholesteric material 8 leads to the reflection (in the planar state) of the part of the light received which is polarized in the same meaning (right or left) as the helicity of the crystal. This polarization will occur, of course, for the reflectivity wavelength associated with the liquid crystal.
  • the reflectivity can not exceed 50%, which is penalizing for the visibility of the reflected image.
  • Figure 2 shows a first embodiment of the invention.
  • a half-wave plate 6 is disposed between the two substrates 2a, 2b and divides the volume 4 delimited by these substrates into two compartments 4a and 4b each enclosing a portion 8a, 8b of the same cholesteric liquid crystal material (thus having the same helicity for each part 8a, 8b).
  • the left-hand part I G of this radiation will pass through the part 8a without being reflected. It will cross the half wave plate 6 and be polarized right at the exit of this blade 6.
  • this portion of the radiation may be reflected by the portion 8b of the liquid crystal. It will then return after reflection the half wave plate 6 which will again polarize left which will allow it to cross the part 8a of the liquid crystal. Cell 1 will therefore also reflect the polarized I G portion to the left of incident radiation I.
  • the cell 1 according to the invention therefore reflects 100% of the received radiation.
  • the necessary increase in voltage is proportional to the ratio between the thickness e of the half wave plate 6 and the total thickness 2 ⁇ of the liquid crystal.
  • FIG. 3 shows another embodiment of the invention which makes it possible to greatly reduce the necessary electrical voltage, thus simplifying the realization of the addressing of the cells.
  • This embodiment differs from the previous one in that the half-wave plate 6 (which is always made in the form of a film of a polymeric material) is now covered on each of its faces by a deposit 7a and 7b of a conductive and optically transparent material.
  • the transparent conductive material may be ITO (indium oxide / tin oxide) or PDOT-PSS.
  • PDOT-PSS refers to a mixture of two polymers, poly (3,4-ethylenedioxythiophene) (or PEDOT) and sodium polystyrene sulfonate (or PSS).
  • the two conductive deposits 7a and 7b are both connected to an input 57 of the voltage source 5.
  • the two electrodes 3a and 3b are both connected to another input 5 3 of the voltage source 5.
  • the voltage source 5 applies a potential difference Ua between the conductive deposit 7a and the electrode 3a and a potential difference Ub between the conductive deposit 7b and the electrode 3b.
  • the reflectivity is 100% as in the previous embodiment.
  • the latter embodiment is therefore particularly well suited to large reflective devices or to consume little energy.

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Nonlinear Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Liquid Crystal (AREA)
EP15807948.3A 2014-11-12 2015-10-28 Cellule a cristal liquide cholesterique a reflectivite augmentee Withdrawn EP3218447A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1402587A FR3028260B1 (fr) 2014-11-12 2014-11-12 Cellule a cristal liquide cholesterique a reflectivite augmentee
PCT/FR2015/052913 WO2016075386A1 (fr) 2014-11-12 2015-10-28 Cellule a cristal liquide cholesterique a reflectivite augmentee

Publications (1)

Publication Number Publication Date
EP3218447A1 true EP3218447A1 (fr) 2017-09-20

Family

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EP15807948.3A Withdrawn EP3218447A1 (fr) 2014-11-12 2015-10-28 Cellule a cristal liquide cholesterique a reflectivite augmentee

Country Status (9)

Country Link
US (1) US10191347B2 (ko)
EP (1) EP3218447A1 (ko)
JP (1) JP2017534927A (ko)
KR (1) KR20170097028A (ko)
FR (1) FR3028260B1 (ko)
IL (1) IL252201A0 (ko)
MY (1) MY185264A (ko)
SG (1) SG11201703606WA (ko)
WO (1) WO2016075386A1 (ko)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108873533A (zh) * 2018-06-29 2018-11-23 深圳市华星光电技术有限公司 显示装置

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GB2163864A (en) * 1984-08-31 1986-03-05 Olympus Optical Co Spectacle lens
EP1628147A1 (en) * 2003-05-16 2006-02-22 NHK Spring Co., Ltd. Object identification medium and identification method
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KR100955445B1 (ko) 2002-04-23 2010-05-04 닛토덴코 가부시키가이샤 편광 소자, 편광 광원 및 이들을 사용한 화상 표시 장치
US8361567B2 (en) * 2008-10-28 2013-01-29 Fujifilm Corporation Liquid crystal composition, liquid crystal device, reflective display material, and light modulating material
TW201033713A (en) * 2009-03-03 2010-09-16 Wintek Corp Reflective color-changing liquid crystal display
JP2011027784A (ja) * 2009-07-21 2011-02-10 Fuji Xerox Co Ltd 表示媒体および記録装置
WO2012051127A2 (en) 2010-10-12 2012-04-19 Kent State University A liquid crystal composition containing chiral dopant, device thereof, and methods thereof
TW201241514A (en) 2011-04-08 2012-10-16 Chimei Innolux Corp Liquid crystal display apparatus with transmission region and reflecting region
WO2013110564A1 (en) * 2012-01-23 2013-08-01 Vlyte Innovations Limited A method for microencapsulating electro-optical fluid

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2612423A1 (de) * 1976-02-25 1977-09-01 Bbc Brown Boveri & Cie Vorrichtung zur modulation von licht fuer in reflexion betriebene feldeffekt-fluessigkristallanzeigen
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MY185264A (en) 2021-04-30
JP2017534927A (ja) 2017-11-24
SG11201703606WA (en) 2017-06-29
FR3028260A1 (fr) 2016-05-13
WO2016075386A1 (fr) 2016-05-19
US20170315398A1 (en) 2017-11-02
FR3028260B1 (fr) 2016-11-04
IL252201A0 (en) 2017-07-31
KR20170097028A (ko) 2017-08-25
US10191347B2 (en) 2019-01-29

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