Polarized RGB light source

Patent metadata

Field	Value
Publication number	US-10459285-B2
Application number	US-201715417460-A
Country	US
Kind code	B2
Filing date	Jan 27, 2017
Priority date	Jan 29, 2016
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

A device for producing polarized light includes a plurality of photonic crystal grid structures on a substrate. The plurality of photonic crystal grid structures includes one or more structured regions for the transmission of polarized blue light, polarized green light, and polarized red light. A green quantum dot layer is substantially positioned on the one or more structured regions for the transmission of polarized green light and a red quantum dot layer is substantially positioned on the one or more structured regions for the transmission of polarized red light. A blue light emitting diode array is disposed on the polarized light device such that the emission from the blue light emitting diode array facilitates the emission of red and green light from the red and green quantum dot layers.

First claim

What is claimed is:

1. A device for producing polarized light, the device comprising:
a plurality of photonic crystal grid structures on a substrate, the plurality of photonic crystal grid structures comprising one or more structured regions for the transmission of polarized blue light, one or more structured regions for the transmission of polarized green light, and one or more structured regions for the transmission of polarized red light;
a green quantum dot layer substantially positioned on the one or more structured regions for the transmission of polarized green light;
a red quantum dot layer substantially positioned on the one or more structured regions for the transmission of polarized red light;
a high refractive index film disposed over the plurality of photonic crystal grid structures on the substrate and the green and red quantum dot layers; and
a blue light emitting diode array disposed on the polarized light device such that the emission from the blue light emitting diode array facilitates the emission of red and green light from the red and green quantum dot layers.

2. The device of claim 1 , further comprising a liquid crystal display (LCD) layer.

3. The device of claim 1 , wherein the photonic crystal grid structures of the plurality of photonic crystal grid structures have a grid pitch of 100 to 400 nm, a grid height of 100 to 300 nm, and a grid width of at least 20 microns.

4. The device of claim 1 , wherein the green and red quantum dot layers are disposed using inkjet printing techniques.

5. The device of claim 1 , further comprising a reflector film, wherein the blue light emitting diode array is disposed in a layer between the reflector film and the opposite side of the substrate from the plurality of photonic crystal grid structures.

6. The device of claim 1 , wherein the green and red quantum dot layers are approximately 100 nm thick.

7. The device of claim 1 , wherein the substrate is one selected from the group consisting of: glass, poly(ethylene terephthalate) (PET), and poly(ethylene-2,6-naphthalene dicarboxylate) (PEN).

8. The device of claim 1 , wherein the high refractive index layer has a refractive index higher than 1.7 and a layer thickness of approximately 100 nm.

9. The device of claim 1 , wherein the green and red quantum dot layers comprise a concentration of 10% of green and red quantum dots by volume, respectively.

10. The device of claim 1 , wherein the plurality of photonic crystal grid structures is fabricated using lithography techniques.

11. A method of fabricating a polarized light source, the method comprising:
fabricating a plurality of photonic crystal grid structures on a substrate, the plurality of photonic crystal grid structures comprising one or more structured regions for the transmission of polarized blue light, one or more structured regions for the transmission of polarized green light, and one or more structured regions for the transmission of polarized red light;
disposing a green quantum dot layer substantially positioned on the one or more structured regions for the transmission of polarized green light;
disposing a red quantum dot layer substantially positioned on the one or more structured regions for the transmission of polarized red light;
coating the polarized light source with a high refractive index film; and
disposing a blue light emitting diode array on the polarized light source such that the emission from the blue light emitting diode array facilitates the emission of red and green light from the red and green quantum dot layers.

12. The method of claim 11 , wherein the photonic crystal grid structures of the plurality of photonic crystal grid structures have a grid pitch of 100 to 400 nm, a grid height of 100 to 300 nm, and a grid width of at least 20 microns.

13. The method of claim 11 , wherein the green and red quantum dot layers are disposed using inkjet printing techniques.

14. The method of claim 11 , wherein the blue light emitting diode array is disposed in a layer on the opposite side of the substrate from the plurality of photonic crystal grid structures.

15. The method of claim 11 , wherein the green and red quantum dot layers are approximately 100 nm thick.

16. The method of claim 11 , wherein the high refractive index layer has a refractive index higher than 1.7 and a layer thickness of approximately 100 nm.

17. The method of claim 11 , wherein the green and red quantum dot layers comprise a concentration of 10% of green and red quantum dots, respectively.

18. The method of claim 11 , wherein the substrate is one selected from the group consisting of: glass, poly(ethylene terephthalate) (PET), and poly(ethylene-2,6-naphthalene dicarboxylate) (PEN).

19. The method of claim 11 , wherein the green and red quantum dot layers comprise a concentration of 10% of green and red quantum dots by volume, respectively.

20. The method of claim 11 , wherein the plurality of photonic crystal grid structures is fabricated using lithography techniques.

21. The method of claim 11 , wherein the method of fabricating the polarized light source is a roll-to-roll process.

Assignees

• Konica Minolta Laboratory Usa Inc

Inventors

• Amano Jun

Classifications

• G02F2202/36

  Micro- or nanomaterials · CPC title

• G02B6/1225

  comprising photonic band-gap structures or photonic lattices · CPC title

• G02F1/133536 Primary

  Reflective polarizers (G02F1/13362 takes precedence) · CPC title

• G02B1/005

  made of photonic crystals or photonic band gap materials (photonic band-gap structures or photonic lattices in integrated optics G02B6/1225; photonic band-gap structures or photonic lattices in optical fibres G02B6/02295) · CPC title

• G02B6/0056 Primary

  for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements · CPC title