Hee Jeong Lee

US Patent:

20220229396, Jul 21, 2022

Filed:

Apr 5, 2022

Appl. No.:

17/658048

Inventors:

- Menlo Park CA, US
Austin Lane - Snohomish WA, US
Wanli Chi - Sammamish WA, US
Hee Yoon Lee - Kirkland WA, US

International Classification:

G03H 1/04
G02B 5/02
G02B 5/08
G03H 1/02

Abstract:

Techniques disclosed herein relate to modifying refractive index modulation in a holographic optical element, such as a holographic grating. According to certain embodiments, a holographic optical element or apodized grating includes a polymer layer comprising a first region characterized by a first refractive index and a second region characterized by a second refractive index. The holographic optical element or apodized grating includes a plurality of nanoparticles dispersed in the polymer layer. The nanoparticles have a higher concentration in either the first region or the second region. In some embodiments, the nanoparticles may be configured to increase the refractive index modulation. In some embodiments, the nanoparticles may be configured to apodize the grating by decreasing the refractive index modulation proximate to sides of the grating. The refractive index may be modulated by applying a monomer reservoir buffer layer to the polymer layer, either before or after hologram fabrication.

US Patent:

20220214548, Jul 7, 2022

Filed:

Mar 16, 2021

Appl. No.:

17/203056

Inventors:

- Menlo Park CA, US
Hee Yoon Lee - Kirkland WA, US
Pasi Saarikko - Kirkland WA, US

International Classification:

G02B 27/01
F21V 8/00

Abstract:

A pupil-replicating waveguide includes a high-index substrate and a low-index substrate coupled by an intermediate layer between the substrates. The refractive index of the intermediate layer is lower than the refractive index of the low-index substrate. The intermediate layer prevents highly oblique rays of image light from entering the low-index substrate, thereby reducing intensity drops in the field of view conveyed by the pupil-replicating waveguide, the intensity drops caused by insufficient replication of the highly oblique rays in the low-index substrate.

US Patent:

20230077228, Mar 9, 2023

Filed:

Aug 9, 2022

Appl. No.:

17/884510

Inventors:

- Menlo Park CA, US
Andrew MAIMONE - Duvall WA, US
Alexander Jobe FIX - Seattle WA, US
Robert Dale CAVIN - Bellevue WA, US
Hee Yoon LEE - Kirkland WA, US
Matthieu Charles Raoul LEIBOVICI - Seattle WA, US
Brian WHEELWRIGHT - Sammamish WA, US
Douglas Robert Lanman - Bellevue WA, US

International Classification:

G02B 27/01
G06T 7/73
G03H 1/04
A01N 43/50
A01N 43/54
A01N 43/90
A01N 53/00
C07D 401/04
C07D 401/14
C07D 405/14
C07D 487/04
C07D 498/04

Abstract:

A system for making a holographic medium for use in generating light patterns for eye tracking includes a light source configured to provide light and a beam splitter configured to separate the light into a first portion of the light and a second portion of the light that is spatially separated from the first portion of the light. The system also includes a first set of optical elements configured to transmit the first portion of the light for providing a first wide-field beam onto an optically recordable medium and one or more diffractive optical elements configured to receive the second portion of the light and project a plurality of separate light patterns onto the optically recordable medium for forming the holographic medium.

US Patent:

20210124108, Apr 29, 2021

Filed:

Jan 10, 2020

Appl. No.:

16/740082

Inventors:

- Menlo Park CA, US
Hee Yoon Lee - Kirkland WA, US

International Classification:

F21V 8/00
G02B 27/01

Abstract:

A display waveguide configured for conveying polychromatic image light to a viewer includes a substrate and a higher-index layer supported by the substrate. The high-index layer supports the transmission of the longer-wavelength color channel of the image light in at least a portion of the field of view.

US Patent:

20210124170, Apr 29, 2021

Filed:

Jan 10, 2020

Appl. No.:

16/740205

Inventors:

- Menlo Park CA, US
Hee Yoon Lee - Kirkland WA, US

International Classification:

G02B 27/01
F21V 8/00

Abstract:

A display waveguide configured for conveying image light to a viewer has a waveguide body which refractive index varies in the thickness direction to include a high-index region between lower-index regions. Multi-layer and gradient index implementations are described. The waveguide transmits a portion of image light within the high-index region of the waveguide to provide a wider field of view.

US Patent:

20210055689, Feb 25, 2021

Filed:

Aug 23, 2019

Appl. No.:

16/550046

Inventors:

- Menlo Park CA, US
Austin LANE - Bellevue WA, US
Wanli CHI - Sammamish WA, US
Hee Yoon LEE - Kirkland WA, US

International Classification:

G03H 1/04
G03H 1/02
G02B 5/02
G02B 5/08

Abstract:

Techniques disclosed herein relate to modifying refractive index modulation in a holographic optical element, such as a holographic grating. According to certain embodiments, a holographic optical element or apodized grating includes a polymer layer comprising a first region characterized by a first refractive index and a second region characterized by a second refractive index. The holographic optical element or apodized grating includes a plurality of nanoparticles dispersed in the polymer layer. The nanoparticles have a higher concentration in either the first region or the second region. In some embodiments, the nanoparticles may be configured to increase the refractive index modulation. In some embodiments, the nanoparticles may be configured to apodize the grating by decreasing the refractive index modulation proximate to sides of the grating. The refractive index may be modulated by applying a monomer reservoir buffer layer to the polymer layer, either before or after hologram fabrication.

US Patent:

20210017150, Jan 21, 2021

Filed:

Oct 6, 2020

Appl. No.:

17/064251

Inventors:

- Menlo Park CA, US
Andrew MAIMONE - Duvall WA, US
Alexander Jobe FIX - Seattle WA, US
Robert Dale CAVIN - Seattle WA, US
Hee Yoon LEE - Kirkland WA, US
Matthieu Charles Raoul LEIBOVICI - Seattle WA, US
Brian WHEELWRIGHT - Sammamish WA, US
Douglas Robert LANMAN - Bellevue WA, US

International Classification:

C07D 401/04
A01N 43/50
A01N 43/90
A01N 53/00
A01N 43/54
C07D 401/14
C07D 405/14
C07D 487/04
C07D 498/04

Abstract:

A system for making a holographic medium for use in generating light patterns for eye tracking includes a light source configured to provide light and a beam splitter configured to separate the light into a first portion of the light and a second portion of the light that is spatially separated from the first portion of the light. The system also includes a first set of optical elements configured to transmit the first portion of the light for providing a first wide-field beam onto an optically recordable medium and one or more diffractive optical elements configured to receive the second portion of the light and project a plurality of separate light patterns onto the optically recordable medium for forming the holographic medium.

US Patent:

20200348514, Nov 5, 2020

Filed:

Jun 22, 2020

Appl. No.:

16/908448

Inventors:

- Menlo Park CA, US
Hee Yoon Lee - Bellevue WA, US
Pasi Saarikko - Kirkland WA, US

International Classification:

G02B 27/00
F21V 8/00
G02B 27/01

Abstract:

A waveguide is provided for conveying image light. The waveguide includes an input port for receiving a first beam of image light carrying an image in a wavelength band. A first diffraction grating of the waveguide includes a plurality of volume Bragg gratings (VBGs) configured to expand the first beam along a first axis and to redirect the first beam towards a second diffraction grating of the waveguide. The second diffraction grating includes a plurality of VBGs configured to receive the first beam from the first diffraction grating and to out-couple different portions of the first wavelength band of the first beam along a second axis, thereby expanding the first beam along the second axis for observation of the image by a user.