Patents by Inventor Vladimir Chigrinov
Vladimir Chigrinov has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9921248Abstract: A method of measuring fluctuations in electric fields is disclosed, the method comprising the step of: placing a Liquid Crystal Device in communication with the electric field, the device having disparate orthogonal polarization sensitivity to an external electric field; utilizing an optical probe beam having a known polarization state to interrogate the liquid crystal of the liquid crystal device to produce a response beam; and analyzing the polarization state of the response beam to provide an indicator of the corresponding fluctuations in the electric field.Type: GrantFiled: January 25, 2013Date of Patent: March 20, 2018Assignee: ZEDELEF PTY LTDInventors: Zourab Brodzeli, Leonardo Silvestri, Andrew Mark Michie, Vladimir Chigrinov, Eugene Pozhidaev, Francois Ladouceur
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Patent number: 9340634Abstract: The present invention relates to materials used for aligning liquid crystals of liquid crystal display elements and to a polymer for use in liquid crystal vertical alignment layer used in producing a liquid crystal vertical alignment layer. The polymer for use in a liquid crystal vertical alignment layer includes (a) a moiety that is photochemically isomerizable but not photochemically crosslinked, (b) a moiety that is photochemically crosslinkable, and (c) a moiety that stabilizes a vertical alignment. The polymer can be used to produce a vertical alignment layer that has a liquid crystal alignment property enabling control of alignment at a low UV dose and that offers a large pretilt angle and superior optical stability.Type: GrantFiled: March 29, 2011Date of Patent: May 17, 2016Assignee: DIC CORPORATIONInventors: Sayaka Nose, Yutaka Nagashima, Isa Nishiyama, Haruyoshi Takatsu, Martin Schadt, Vladimir Chigrinov, Hoi Sing Kwok
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Publication number: 20140354263Abstract: A method of measuring fluctuations in electric fields is disclosed, the method comprising the step of: placing a Liquid Crystal Device in communication with the electric field, the device having disparate orthogonal polarization sensitivity to an external electric field; utilising an optical probe beam having a known polarization state to interrogate the liquid crystal of the liquid crystal device to produce a response beam; and analyzing the polarization state of the response beam to provide an indicator of the corresponding fluctuations in the electric field.Type: ApplicationFiled: January 25, 2013Publication date: December 4, 2014Applicant: NewSouth Innovations Pty LtdInventors: Zourab Brodzeli, Leonardo Silvestri, Andrew Mark Michie, Vladimir Chigrinov, Eugene Pozhidaev, Francois Ladouceur
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Publication number: 20130116396Abstract: The present invention relates to materials used for aligning liquid crystals of liquid crystal display elements and to a polymer for use in liquid crystal vertical alignment layer used in producing a liquid crystal vertical alignment layer. The polymer for use in a liquid crystal vertical alignment layer includes (a) a moiety that is photochemically isomerizable but not photochemically crosslinked, (b) a moiety that is photochemically crosslinkable, and (c) a moiety that stabilizes a vertical alignment. The polymer can be used to produce a vertical alignment layer that has a liquid crystal alignment property enabling control of alignment at a low UV dose and that offers a large pretilt angle and superior optical stability.Type: ApplicationFiled: March 29, 2011Publication date: May 9, 2013Applicant: DIC CORPORATIONInventors: Sayaka Nose, Yutaka Nagashima, Isa Nishiyama, Haruyoshi Takatsu, Martin Schadt, Vladimir Chigrinov, Hoi Sing Kwok
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Publication number: 20120242918Abstract: A liquid crystal optical device that includes a first substrate layer that is substantially flat and a second substrate layer that is substantially flat and parallel to the first substrate layer. The liquid crystal optical device further includes a layer of cholesteric liquid crystal disposed between the first substrate layer and the second substrate layer, where the layer of cholesteric liquid crystal is arranged in domains, each domain having a helical axis, wherein the helical axes of the domains have a plurality of orientations relative to an orientation of the first and second substrate layers, and where a wavefront of a light wave having a wavelength within a range of wavelengths changes after reflecting from the layer of cholesteric liquid crystal.Type: ApplicationFiled: March 23, 2012Publication date: September 27, 2012Applicant: The Hong Kong University of Science and TechnologyInventors: Sergiy Valyukh, Vladimir Chigrinov, Hoi Sing Kwok, Iryna Valyukh
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Patent number: 7381507Abstract: This invention relates to methods for preparing photo-patterned mono- or polychromatic, polarizing films. The polarizer can be pixelated into a number of small regions wherein some of the regions have one orientation of the principal neutral or color absorbing axis; and some other of the said regions have another orientation of the principal neutral or color absorbing axis. The axis orientation is determined by the polarization vector of actinic radiation and the multi-axes orientation is possible by a separated masked exposure. This polarizer can be placed on the interior substrate surface of the LCD cell.Type: GrantFiled: July 10, 2003Date of Patent: June 3, 2008Assignee: The Hong Kong University of Science and TechnologyInventors: Hoi-Sing Kwok, Wing-Chiu Yip, Vladimir Chigrinov, Vladimir Kozenkov
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Publication number: 20080002107Abstract: A transflective liquid crystal display having at least one reflective region 122 and at least one transmissive region 121. The display comprises a first polarizer 5, a second polarizer 100 opposing the first polarizer 5, two twisted nematic liquid crystal layers 30, 60 between said first and second polarizers 5, 100 and a reflector 110 for reflecting light passing though the reflective region 122 of the display. The twisted nematic liquid crystal layers 30, 60 have opposite twist directions to each other. The second twisted nematic liquid crystal layer 60 improves the contrast of the display. The display may have a double cell arrangement, in which case there may be a single cell gap or a double cell gap. Alternatively, the display may have a single cell arrangement in which case the second twisted nematic liquid crystal layer is a temperature dependent retardation film 65.Type: ApplicationFiled: May 30, 2007Publication date: January 3, 2008Inventors: Hin Mak, Vladimir Chigrinov
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Publication number: 20070258677Abstract: An electrooptically tunable waveguide-coupled microresonator. In one example embodiment, the switch includes a photoalignment layer that enhances control of liquid crystal alignment in the cladding near the coupling region of the microresonator and waveguide.Type: ApplicationFiled: April 24, 2007Publication date: November 8, 2007Applicant: The Hong Kong University of Science and TechnologyInventors: Vladimir Chigrinov, Linjie Zhou, Alexander Muravsky, Andrew Poon
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Publication number: 20070254220Abstract: An azo compound of the present invention is represented by the general formula (1): (wherein, R1 and R2 each independently represents a hydroxy group, or a polymerizable functional group selected from the group consisting of a (meth)acryloyl group, a (meth)acryloyloxy group, a (meth)acrylamide group, a vinyl group, a vinyloxy group, and a maleimide group; X1 represents single bond when R1 is a hydroxy group and represents a linking group represented by -(A1-B1)m- when R1 is a polymerizable functional group; X2 represents a single bond when R2 is a hydroxy group and represents a linking group represented by -(A2-B2)n- when R2 is a polymerizable functional group; R3 and R4 each independently represents —OR7, a hydroxyalkyl group having 1 to 4 carbon atoms, or —CONR8R9; and R5 and R6 each independently represents a carboxy group, a sulfo group, a nitro group, amino group, or a hydroxy group).Type: ApplicationFiled: June 28, 2005Publication date: November 1, 2007Applicants: DAINIPPON INK AND CHEMICALS, INC., HONG KONG UNIVERSITY OF SCIENCE & TECHNOLOGYInventors: Hitoshi Kondo, Yasuhiro Kuwana, Hirokazu Takada, Vladimir Chigrinov, Hoi-Sing Kwok
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Publication number: 20060232860Abstract: The present invention provides a method of forming a polarizing material comprising exposing a layer of dichroic material to activating light illumination to provide an ordered structure with a distinguished absorption axis and thus photo-induce polarization, and fixing the induced polarization by polymerisation of the dichroic layer. The present invention also provides novel polarizing formed thereby. By selectively exposing regions of the dichroic material to differing activating radiation, different regions with different polarization axes can be created. The polarizing material can also be provided with a coating or coatings to alter the spectral response, and a stack formed of a plurality if dichroic layers may be provided.Type: ApplicationFiled: January 13, 2006Publication date: October 19, 2006Inventors: Vladimir Kozenkov, Wing Yip, Vladimir Chigrinov, Elena Prudnikova, Hoi Kwok
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Publication number: 20040008298Abstract: This invention relates to methods for preparing photo-patterned mono- or polychromatic, polarizing films. The polarizer can be pixelated into a number of small regions wherein some of the regions have one orientation of the principal neutral or color absorbing axis; and some other of the said regions have another orientation of the principal neutral or color absorbing axis. The axis orientation is determined by the polarization vector of actinic radiation and the multi-axes orientation is possible by a separated masked exposure. This polarizer can be placed on the interior substrate surface of the LCD cell.Type: ApplicationFiled: July 10, 2003Publication date: January 15, 2004Applicant: The Hong Kong University of Science and TechnologyInventors: Hoi-Sing Kwok, Wing-Chiu Yip, Vladimir Chigrinov, Vladimir Kozenkov
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Patent number: 6630289Abstract: This invention relates to methods for preparing photo-patterned mono- or polychromatic, polarizing films. The polarizer can be pixelated into a number of small regions wherein some of the regions have one orientation of the principal neutral or color absorbing axis; and some other of the said regions have another orientation of the principal neutral or color absorbing axis. The axis orientation is determined by the polarization vector of actinic radiation and the multi-axes orientation is possible by a separated masked exposure. This polarizer can be placed on the interior substrate surface of the LCD cell.Type: GrantFiled: August 22, 2000Date of Patent: October 7, 2003Assignee: The Hong Kong University of Science and TechnologyInventors: Hoi-Sing Kwok, Wing-Chiu Yip, Vladimir Chigrinov, Vladimir Kozenkov
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Publication number: 20030072896Abstract: The present invention relates to chemical compositions of synthetic dyes and a fabrication process for the photo-induced alignment of liquid crystals. The compositions and methods of the invention are applicable to lateral field driven LCDs such as the In-plane Switching mode. A method of alignment using a multiple wavelengths light source is disclosed. This is a non-contact technique to align liquid crystals so that the particulates and static charges generated by the rubbing process can be eliminated. A synthetic dye film is exposed to a linearly polarized or non-polarized light. Due to photoisomerization, conformational molecular change occurs, and the isomer orientation is no longer random but becomes anisotropic. This in turn gives rise to a homogeneous anisotropic orientation of the liquid crystal molecules.Type: ApplicationFiled: June 7, 2002Publication date: April 17, 2003Applicant: The Hong Kong University of Science and TechnologyInventors: Hoi-Sing Kwok, Wing-Chiu Yip, Vladimir Chigrinov, Vladimir Kozenkov, Elena Prudnikova