Pavel I Lazarev

US Patent:

6399166, Jun 4, 2002

Filed:

Apr 23, 1999

Appl. No.:

09/171299

Inventors:

Ir Gvon Khan - Moscow, RU
Yuri A. Bobrov - Moscow, RU
Victor A. Bykov - Moscow, RU
Leonid Y. Ignatov - Moscow, RU
Pavel I. Lazarev - Belmont CA

Assignee:

Optiva, Inc. - South San Francisco CA

International Classification:

C09K 1960

US Classification:

428 131, 359491, 359492, 534607, 534611, 546 35, 546 37, 428 12

Abstract:

A liquid crystal display has a first substrate plate and a second substrate plate, and a liquid crystal layer disposed between the plates. A polarizing coating, having molecules of one or more organic dyes capable of forming a lyotropic liquid crystalline phase, is formed overlying a selected surface of each plate. Orientation of the polarizing coating is obtained by applying a force to the dye molecules when in the liquid crystal phase and subsequently converting the liquid crystal phase to a solid film.

US Patent:

6563640, May 13, 2003

Filed:

Apr 2, 2001

Appl. No.:

09/720227

Inventors:

Leonid Y. Ignatov - Moscow, RU
Yuri A. Bobrov - Moscow, RU
Pavel I. Lazarev - Belmont CA

Assignee:

Optiva, Inc. - South San Francisco CA

International Classification:

G02B 2728

US Classification:

359491, 359490, 359492, 359500, 359900, 349194, 252525

Abstract:

The present invention relates to heat-resistant and plarizers that use thin films of dichroic organic substances, mainly dichroic dyes applied on the surface of rigid or flexible substrates in which the molecules of the dichroic organic substance are arranged in the form of a crystalline grid. The purpose of this invention is to widen the spectral range of the polarizer operation while improving polarization characteristics. This dichroic polarizer includes a film having a portion at least consisting of a crystalline structure that comprises at least one dichroic organic substance, wherein the molecules or molecule fragments of this substance have a planar morphology. The dichroic substance consists of a dichroic substance having at least one crest on the spectral absorption curve within spectral ranges of 400 to 700 nm and/or 200 to 400 nm and 0. 7 to 13 m. The order parameter of the film S is defined by the formula S=(D -D )/(D ) in which D and D represent the optical density measured in the polarized light during the perpendicular and parallel orientations, respectively, of the polarizer polarization axis relative to the polarization plane of an electromagnetic radiation from a spectrometer. This parameter corresponds to at least one crest on the spectral absorption curve within a spectral range of 0.

US Patent:

6619553, Sep 16, 2003

Filed:

Aug 24, 2001

Appl. No.:

09/914246

Inventors:

Yuri A. Bobrov - Moscow, RU
Pavel I. Lazarev - Belmont CA

Assignee:

Optiva, Inc. - South San Francisco CA

International Classification:

G06K 1906

US Classification:

235492, 235380

Abstract:

The present invention pertains to the field of electronic devices and essentially relates to smart cards (electronic cards) including a display that comprises a liquid-crystal indication element with an internal polarizer. This invention also relates to a method for manufacturing this card. The purpose of this invention is to simplify the structure of the electronic card, to provide a single process for manufacturing the card together with the display, to reduce the thickness of the card, to improve the mechanical strength, the manufacturability and the economical characteristics of said card and to increase its reliability.

US Patent:

6841320, Jan 11, 2005

Filed:

Feb 4, 2003

Appl. No.:

10/358607

Inventors:

Pavel I. Lazarev - Belmont CA, US
Natalya A. Ovchinnikova - Mendeleevo, RU

Assignee:

Optiva, Inc. - South San Francisco CA

International Classification:

G03F 734
B44C 1165

US Classification:

430 20, 400200, 400253, 400254, 400964, 156234, 503227

Abstract:

The invention pertains to the field of fabrication of devices of various purposes, which use anisotropic films: polarizers, retarders, etc. , as well as technology of obtaining coatings with anisotropy of electric conductivity, magnetic properties, thermal conduction and other physical properties. The invention includes the method of forming anisotropic crystal film on a receptor plate via transferring it from the donor plateImplementing the disclosed invention preserves the high degree of anisotropy and optical parameters of crystal films after the transfer. Additionally, it is possible to form anisotropic coatings on the surface of any configuration (including curved) and different degree of roughness; also, it is possible to transfer films of various sizes and configurations as well as multilayer coatings containing anisotropic film and form color images.

US Patent:

6847420, Jan 25, 2005

Filed:

Sep 10, 2002

Appl. No.:

10/241068

Inventors:

Pavel I. Lazarev - Belmont CA, US
Michael V. Paukshto - Foster City CA, US

Assignee:

Optiva, Inc. - South San Francisco CA

International Classification:

G02F 11335

US Classification:

349 96, 349105, 359498

Abstract:

A liquid crystal display is provided which comprises front and rear panels, and electrodes, polarizers and a layer of liquid crystal disposed between the front and rear panels. The polarizer on the rear panel is preferably a reflecting type in at least one region of the spectrum and contains at least one element in the form of a multilayer structure. The multilayer structure contains at least two anisotropic layers separated by at least one intermediate layer which is optically transparent in the desired spectral region. The ratio of refraction indices and thickness of the layers in the multilayer structure is chosen such to provide an extremum for the ratio of the transmitted and reflected polarized light in the spectral region.

US Patent:

6848897, Feb 1, 2005

Filed:

Jan 8, 2002

Appl. No.:

10/043959

Inventors:

Pavel I. Lazarev - Belmont CA, US
Michael V. Paukshto - San Mateo CA, US

Assignee:

Optiva, Inc. - South San Francisco CA

International Classification:

B29D 1100

US Classification:

425224, 264108, 425363, 425373, 425471, 118261

Abstract:

This invention pertains to technology of fabricating thin films featuring anisotropic properties such as: optical, magnetic, electric conductivity and others. In particular, this invention is related to devices for obtaining polarizing films from liquid-crystalline solutions of organic materials, for example organic dyes. The disclosed method and device permits the fabrication of anisotropic films from liquid-crystalline solution with high characteristics and high degree of perfection of the oriented structure with significant reproducibility of results. The device makes use of a mechanical element for receiving and guiding the liquid crystal solution onto a substrate and then providing an orienting action to the kinetic elements as they are delivered.

US Patent:

6876806, Apr 5, 2005

Filed:

May 18, 2001

Appl. No.:

09/860722

Inventors:

Pavel I. Lazarev - Belmont CA, US
Michael V. Paukshto - San Mateo CA, US

Assignee:

Optiva, Inc. - South San Francisco CA

International Classification:

G02B006/02

US Classification:

385128, 385147

Abstract:

Optical waveguides of the type which include a light-transmitting core and a cladding layer on said core. The optical waveguide can be planar or cylindrical such as an optical fiber. The optical waveguide is provided with an additional coating of highly biaxial or uniaxial crystalline material with different refraction indices in different directions.

US Patent:

6913783, Jul 5, 2005

Filed:

Feb 6, 2002

Appl. No.:

10/239944

Inventors:

Pavel I. Lazarev - Belmont CA, US
Victor V. Nazarov - Odintsovo, RU
Natalya A. Ovchinnikova - Mendeleevo, RU

Assignee:

Optiva, Inc. - So. San Francisco CA

International Classification:

B05D005/06
B05C011/00

US Classification:

427162, 118600

Abstract:

The invention pertains to methods of obtaining anisotropic crystalline films and to devices for carrying out the methods. A colloidal system with anisometric particles is applied as a film onto the surface of a substrate while the viscosity of the colloidal system is lowered. The particles of the colloidal system with lowered viscosity are oriented and the original viscosity of the colloidal system is restored. The film is then dried. The drying is carried out under controlled conditions. Zones of the dried film may be progressively heated to improve the film characteristics.