WO2007146853A2 - Method to reduce power consumption with electro-optic lenses - Google Patents

Method to reduce power consumption with electro-optic lenses Download PDF

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Publication number
WO2007146853A2
WO2007146853A2 PCT/US2007/070827 US2007070827W WO2007146853A2 WO 2007146853 A2 WO2007146853 A2 WO 2007146853A2 US 2007070827 W US2007070827 W US 2007070827W WO 2007146853 A2 WO2007146853 A2 WO 2007146853A2
Authority
WO
WIPO (PCT)
Prior art keywords
liquid crystal
conductive layer
voltage
layer
electrode set
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.)
Ceased
Application number
PCT/US2007/070827
Other languages
English (en)
French (fr)
Other versions
WO2007146853A3 (en
Inventor
Gerald Meredith
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.)
Johnson and Johnson Vision Care Inc
Original Assignee
Johnson and Johnson Vision Care Inc
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 Johnson and Johnson Vision Care Inc filed Critical Johnson and Johnson Vision Care Inc
Priority to CN2007800291908A priority Critical patent/CN101501616B/zh
Priority to AU2007257765A priority patent/AU2007257765C1/en
Priority to CA2655293A priority patent/CA2655293C/en
Priority to HK10100668.9A priority patent/HK1137069B/xx
Priority to JP2009515581A priority patent/JP2009540392A/ja
Priority to MX2008015907A priority patent/MX2008015907A/es
Priority to KR1020097000447A priority patent/KR101313007B1/ko
Priority to EP07798357A priority patent/EP2030101A4/en
Priority to BRPI0713005-8A priority patent/BRPI0713005A2/pt
Publication of WO2007146853A2 publication Critical patent/WO2007146853A2/en
Publication of WO2007146853A3 publication Critical patent/WO2007146853A3/en
Anticipated expiration legal-status Critical
Ceased 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
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/08—Auxiliary lenses; Arrangements for varying focal length
    • G02C7/081—Ophthalmic lenses with variable focal length
    • G02C7/083—Electrooptic lenses
    • 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
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • 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
    • G02F1/29—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 position or the direction of light beams, i.e. deflection
    • G02F1/294—Variable focal length devices
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes 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 no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes 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 no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes 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 no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes 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 no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes 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 no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes 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 no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3614—Control of polarity reversal in general

Definitions

  • This invention relates to electro-optic lenses having reduced power consumption.
  • Electro-optic devices have been developed for use in many applications, including spectacle lenses, optical systems, liquid crystal displays and other devices. It is desired that the power required to drive the device be as low as possible, to allow long device life before recharging and to permit smaller power sources to be used, among other benefits.
  • an electro-optic device having reduced power consumption. More specifically, an electro-optic device is provided comprising: a liquid crystal layer between a pair of opposing transparent substrates; a patterned electrode set positioned between the liquid crystal layer and the inward-facing surface of the first transparent substrate; a conductive layer between the liquid crystal layer and the inward-facing surface of the second transparent substrate; and means for applying voltage to the patterned electrode set and the conductive layer, wherein the voltage applied to the conductive layer is below the threshold voltage (the RMS voltage difference above which the optical transmission of the liquid crystal layer changes).
  • the voltage difference between the voltage applied to the patterned electrode set and the voltage applied to the conductive layer is sufficient to provide the desired amount of optical transmission change in the liquid crystal.
  • substantially homogenously aligned liquid crystals have a surface anchoring energy and significant elastic constants that result in no director reorientation at RMS voltages below a threshold level (V T h). If the RMS voltage applied across the liquid crystal is higher than V Th , the director reorients and the optical transmission changes until saturation is reached.
  • V T h a threshold level
  • a voltage was applied across the liquid crystal using the conductive layer as a ground. This applied voltage was at least the sum of the threshold voltage and the additional amount of voltage to reorient the director to the desired extent.
  • the conductive layer (unpatterned electrode) is driven near the threshold voltage. This allows the patterned electrode to be driven at a lower voltage than in previous designs.
  • the threshold voltage is about 1.3 V RMS.
  • a voltage below 1.3 V RMS is applied to the conductive layer.
  • the voltage applied to the patterned electrodes is sufficient such that the liquid crystal director reorients to provide the desired optical transmission. This voltage is less than in previous designs.
  • the devices of the invention can be used in a variety of applications known in the art, including lenses used for human or animal vision correction or modification.
  • the lenses can be incorporated in spectacles, as known in the art.
  • Spectacles can include one lens or more than one lens.
  • the devices may also be used in display applications, as known to one of ordinary skill in the art without undue experimentation.
  • the lenses of the invention can be used with conventional lenses and optics.
  • Figure 2 shows the previous design where a voltage is applied across a liquid crystal cell.
  • Figure 3 shows one example of a patterned electrode set.
  • Figure 4 shows the use of oppositely phased square-wave drivers.
  • DOE diffractive-optical-elements
  • PTF phase-transmission-function
  • the electro-optic lens used in the present invention is a diffractive lens using a patterned electrode set to produce the desired distribution of phase retardations that allows the lens to function as a zone-plate lens.
  • Diffractive lenses are known in the art.
  • the function of a diffractive lens is based on near-field diffraction by a Fresnel zone pattern. Each point emerging from the structure serves as an emitter of a spherical wave.
  • the optical field at a particular observing point is a summation of the contributions of the emitted spherical waves over the entire structure. Constructive interference of the spherical waves coming from the various points creates a high intensity at the observation point, corresponding to a high diffraction efficiency.
  • Liquid crystal cells are known in the art. All art-known cell configurations and operations of liquid crystal cells are incorporated by reference to the extent they are not incompatible with the disclosure herewith.
  • the substrates can be any material that can provide desired optical transmission and can function in the devices and methods described herein, such as quartz, glass or plastic, as known in the art.
  • Conductive layer 30 is patterned with a patterned electrode set to provide the desired diffraction pattern.
  • the patterned electrodes consist of a circular array of rings whose radii are determined by the focal length desired, as described elsewhere (see for example, references cited herein and US application 2004/0223113).
  • the patterned electrode is fabricated by photolithographic processing of a conductive film deposited on a substrate, or other techniques, as known in the art.
  • Figure 3 illustrates the layout of one example of an electrode pattern. Adjacent zones are distinguished by grey and black colors.
  • Each ring electrode is independently addressable by adding an electrical insulation layer with vias (represented by dots).
  • Conductive layer 40 is not patterned.
  • the conductive material used for the conductive layers may be any suitable material, including those specifically described herein, and other materials known in the art.
  • the conductive material be transparent, such as indium oxide, tin oxide or indium tin oxide (ITO).
  • the thickness of each conducting layer is typically between 30 nm and 200 nm. The layer must be thick enough to provide adequate conduction, but not so thick as to provide excess thickness to the overall lens structure.
  • the substrates are kept at a desired distance with spacers (60), or other means known in the art. Spacers may be any desired material such as Mylar, glass or quartz, or other materials useful to provide the desired spacing.
  • the liquid crystal layer In order to achieve efficient diffraction the liquid crystal layer must be thick enough to provide one wave of activated retardation (d > ⁇ / ⁇ n ⁇ 2.5 ⁇ m, where ⁇ n is the birefringence of the liquid crystal media), but thicker liquid crystal layers help to avoid saturation phenomena. Disadvantages of thicker cells include long switching times (varying as d 2 ) and loss of electro-optic feature definition.
  • the transparent substrates are spaced between three and 20 microns apart, and all individual values and ranges therein. One currently preferred spacing is 5 microns.
  • the surfaces of the substrates are coated with an alignment layer (50), such as polyvinylalcohol (PVA) or nylon 6,6 and are treated by rubbing to give a homogeneous director orientation. It is preferred that the alignment layer on one substrate is rubbed antiparallel from the alignment layer on the other substrate as shown by the arrows in Figure 2. This allows proper alignment of the liquid crystal, as known in the art.
  • an alignment layer such as polyvinylalcohol (PVA) or nylon 6,6
  • Voltage is applied to the patterned electrode set and conductive layer using means known in the art.
  • a voltage is applied to the inner conductive surfaces of the substrates as shown in Figure 2.
  • the symbols used in Figure 2 are conventional in the art.
  • one conductive layer served as a ground.
  • one driver circuit is attached to the conductive layer and a separate driver circuit is attached to the patterned electrode set. Electrical contacts can be made to the electrodes using thin wires or conductive strips at the edge of the lens, or by a set of conducting vias down the lens, as known in the art.
  • the voltages supplied to the conductive layer and patterned electrode set are dependent on the particular liquid crystal used, the thickness of the liquid crystal in the cell, the desired optical transmission, and other factors, as known in the art.
  • the actual voltages used can be determined by one of ordinary skill in the art without undue experimentation using the knowledge of the art and the disclosure herein. It is known in the art that various methods of controlling all aspects of the voltage applied to electrodes can be used, including a processor, a microprocessor, an integrated circuit, and a computer chip.
  • V rms ⁇ (V 1 - V 2 ) 2 ⁇ 2 .
  • Vrm s2 V SW2 is set near but below the LC film's threshold voltage
  • V sw i V sw1 values
  • a "patterned electrode set” means one or more areas of conductive material arranged in a pattern on a substrate, along with one or more areas of insulating material arranged in a complementary pattern with said areas of conductive material on said substrate.
  • the liquid crystal used in the invention include those that form nematic, smectic, or cholesteric phases that possess a long-range orientational order that can be controlled with an electric field. It is preferred that the liquid crystal have a wide nematic temperature range, easy alignability, low threshold voltage, large electro- optic response and fast switching speeds, as well as proven stability and reliable commercial availability.
  • E7 a nematic liquid crystal mixture of cyanobiphenyls and cyanoterphenyls sold by Merck is used.
  • nematic liquid crystals examples include pentyl-cyano- biphenyl (5CB), (n-octyloxy)-4-cyanobiphenyl (80CB).
  • Electroactive polymers can also be used in the invention. Electroactive polymers include any transparent optical polymeric material such as those disclosed in "Physical Properties of Polymers Handbook" by J. E. Mark, American Institute of Physics, Woodburry, N. Y., 1996, containing molecules having unsymmetrical polarized conjugated p electrons between a donor and an acceptor group (referred to as a chromophore) such as those disclosed in "Organic Nonlinear Optical Materials” by Ch. Bosshard et al., Gordon and Breach Publishers, Amsterdam, 1995. Examples of polymers are as follows: polystyrene, polycarbonate, polymethylmethacrylate, polyvinylcarbazole, polyimide, polysilane.
  • Electroactive polymers can be produced by: a) following a guest/host approach, b) by covalent incorporation of the chromophore into the polymer (pendant and main-chain), and/or c) by lattice hardening approaches such as cross-linking, as known in the art.
  • Polymer liquid crystals may also be used in the invention.
  • Polymer liquid crystals are also sometimes referred to as liquid crystalline polymers, low molecular mass liquid crystals, self-reinforcing polymers, in situ-composites, and/or molecular composites.
  • PLCs are copolymers that contain simultaneously relatively rigid and flexible sequences such as those disclosed in "Liquid Crystalline Polymers: From Structures to Applications" by W. Brostow; edited by A. A. Collyer, Elsevier, New- York-London, 1992, Chapter 1.
  • Examples of PLCs are: polymethacrylate comprising 4-cyanophenyl benzoate side group and other similar compounds.
  • PDLCs Polymer dispersed liquid crystals
  • NCAP nematic curvilinear aligned phases
  • TIPS thermally induced phase separation
  • SIPS solvent-induced phase separation
  • PIPS polymerization-induced phase separation
  • BDH-Merck mixtures of liquid crystal E7
  • NOA65 Norland products, Inc.
  • PSLCs Polymer-stabilized liquid crystals
  • PSLCs are materials that consist of a liquid crystal in a polymer network in which the polymer constitutes less than 10% by weight of the liquid crystal.
  • a photopolymerizable monomer is mixed together with a liquid crystal and an UV polymerization initiator. After the liquid crystal is aligned, the polymerization of the monomer is initiated typically by UV exposure and the resulting polymer creates a network that stabilizes the liquid crystal.
  • PSLCs see, for instance: C. M. Hudson et al. Optical Studies of Anisotropic Networks in Polymer-Stabilized Liquid Crystals, Journal of the Society for Information Display, vol.
  • Self-assembled nonlinear supramolecular structures include electroactive asymmetric organic films, which can be fabricated using the following approaches: Langmuir-Blodgett films, alternating polyelectrolyte deposition (polyanion/polycation) from aqueous solutions, molecular beam epitaxy methods, sequential synthesis by covalent coupling reactions (for example: organotrichlorosilane-based self- assembled multilayer deposition). These techniques usually lead to thin films having a thickness of less than about 1 ⁇ m.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Ophthalmology & Optometry (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Geometry (AREA)
  • Engineering & Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
PCT/US2007/070827 2006-06-12 2007-06-11 Method to reduce power consumption with electro-optic lenses Ceased WO2007146853A2 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
CN2007800291908A CN101501616B (zh) 2006-06-12 2007-06-11 利用电-光透镜降低功耗的方法
AU2007257765A AU2007257765C1 (en) 2006-06-12 2007-06-11 Method to reduce power consumption with electro-optic lenses
CA2655293A CA2655293C (en) 2006-06-12 2007-06-11 Method to reduce power consumption with electro-optic lenses
HK10100668.9A HK1137069B (en) 2006-06-12 2007-06-11 Method to reduce power consumption with electro-optic lenses
JP2009515581A JP2009540392A (ja) 2006-06-12 2007-06-11 電気光学レンズのパワー消費を低減する方法
MX2008015907A MX2008015907A (es) 2006-06-12 2007-06-11 Metodo para reducir consumo de energia con lentes electro-opticos.
KR1020097000447A KR101313007B1 (ko) 2006-06-12 2007-06-11 전기적 광학렌즈의 전력소비 감소방법
EP07798357A EP2030101A4 (en) 2006-06-12 2007-06-11 PROCESS FOR ELECTRICAL CONSUMPTION REDUCTION WITH ELECTROOPTIC LENSES
BRPI0713005-8A BRPI0713005A2 (pt) 2006-06-12 2007-06-11 método para reduzir o consumo de energia com lentes eletro-ópticas

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US80449406P 2006-06-12 2006-06-12
US60/804,494 2006-06-12

Publications (2)

Publication Number Publication Date
WO2007146853A2 true WO2007146853A2 (en) 2007-12-21
WO2007146853A3 WO2007146853A3 (en) 2008-10-30

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PCT/US2007/070827 Ceased WO2007146853A2 (en) 2006-06-12 2007-06-11 Method to reduce power consumption with electro-optic lenses

Country Status (12)

Country Link
US (1) US7755583B2 (OSRAM)
EP (1) EP2030101A4 (OSRAM)
JP (2) JP2009540392A (OSRAM)
KR (1) KR101313007B1 (OSRAM)
CN (1) CN101501616B (OSRAM)
AR (1) AR061344A1 (OSRAM)
AU (1) AU2007257765C1 (OSRAM)
BR (1) BRPI0713005A2 (OSRAM)
CA (1) CA2655293C (OSRAM)
MX (1) MX2008015907A (OSRAM)
TW (1) TWI425271B (OSRAM)
WO (1) WO2007146853A2 (OSRAM)

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WO2020014260A1 (en) * 2018-07-10 2020-01-16 Verily Life Sciences Llc Switching of liquid crystal device

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