Ling Li

US Patent:

20210382221, Dec 9, 2021

Filed:

Aug 23, 2021

Appl. No.:

17/409163

Inventors:

- Plantation FL, US
Brian George Hill - Duxbury MA, US
Christophe Peroz - San Francisco CA, US
Chieh Chang - Cedar Park TX, US
Ling Li - Cedar Park TX, US

International Classification:

F21V 8/00
G02B 27/01

Abstract:

A diffractive waveguide stack includes first, second, and third diffractive waveguides for guiding light in first, second, and third visible wavelength ranges, respectively. The first diffractive waveguide includes a first material having first refractive index at a selected wavelength and a first target refractive index at a midpoint of the first visible wavelength range. The second diffractive waveguide includes a second material having a second refractive index at the selected wavelength and a second target refractive index at a midpoint of the second visible wavelength range. The third diffractive waveguide includes a third material having a third refractive index at the selected wavelength and a third target refractive index at a midpoint of the third visible wavelength range. A difference between any two of the first target refractive index, the second target refractive index, and the third target refractive index is less than 0.005 at the selected wavelength.

US Patent:

20200400870, Dec 24, 2020

Filed:

Jun 23, 2020

Appl. No.:

16/909201

Inventors:

- Plantation FL, US
Brian George Hill - Duxbury MA, US
Christophe Peroz - San Francisco CA, US
Chieh Chang - Cedar Park TX, US
Ling Li - Cedar Park TX, US

International Classification:

F21V 8/00
G02B 27/01

Abstract:

A diffractive waveguide stack includes first, second, and third diffractive waveguides for guiding light in first, second, and third visible wavelength ranges, respectively. The first diffractive waveguide includes a first material having first refractive index at a selected wavelength and a first target refractive index at a midpoint of the first visible wavelength range. The second diffractive waveguide includes a second material having a second refractive index at the selected wavelength and a second target refractive index at a midpoint of the second visible wavelength range. The third diffractive waveguide includes a third material having a third refractive index at the selected wavelength and a third target refractive index at a midpoint of the third visible wavelength range. A difference between any two of the first target refractive index, the second target refractive index, and the third target refractive index is less than 0.005 at the selected wavelength.