Hybrid polarizing beam splitter

Patent metadata

Field	Value
Publication number	US-9958699-B2
Application number	US-201314135703-A
Country	US
Kind code	B2
Filing date	Dec 20, 2013
Priority date	Dec 21, 2012
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

Polarizing beam splitters and systems incorporating such beam splitters are described. More specifically, hybrid polarizing beam splitters and systems with such beam splitters that incorporate polymeric reflective polarizers aligned with MacNeille or wire grid reflective polarizers are described.

First claim

What is claimed is:

1. A system, comprising:
an optical component, comprising:
a first reflective polarizer disposed to reflect light having a first polarization state and transmit light having a second polarization state different from the first polarization state; and
a second reflective polarizer positioned adjacent the first reflective polarizer and disposed to reflect light having the first polarization state and transmit light having the second polarization state;
wherein the first reflective polarizer is a polymeric reflective polarizer and the second reflective polarizer comprises inorganic dielectric layers or a wire grid;

a light source directing light towards the optical component, light from the light source intercepting the first reflective polarizer at an angle of about 45 degrees, wherein light intercepting the first reflective polarizer and having the first polarization state is reflected from the first reflective polarizer;
a polarization rotating reflector disposed such that the light reflected from the first reflective polarizer intercepts the polarization rotating reflector at an angle of about 90 degrees, the light being reflected back towards the first reflective polarizer and converted to the second polarization state; and,
a reflective imager disposed so that the light reflected from the polarization rotating reflector passes through the first and second reflective polarizers, intercepts the reflective imager at an angle of about 90 degrees, and is imaged;
wherein imaged light is reflected from the reflective imager, intercepts the second reflective polarizer at an angle of about 45 degrees, is reflected and exits the system.

2. The system of claim 1 , wherein the first reflective polarizer comprises alternating layers of polymeric film having different refractive indices.

3. The system of claim 1 , wherein the second reflective polarizer comprises inorganic dielectric layers deposited onto optical glass.

4. The system of claim 1 , wherein the first polarization state comprises a linear polarization state.

5. The system of claim 4 , wherein the second polarization state comprises a linear polarization state orthogonal to the first polarization state.

6. The system of claim 1 , further comprising an optically clear adhesive positioned between the first reflective polarizer and the second reflective polarizer.

7. The system of claim 6 , wherein the optically clear adhesive is a pressure sensitive adhesive.

8. The system of claim 1 , wherein the optical component comprises a pellicle component.

9. The system of claim 1 , further comprising a first prism with a first diagonal surface positioned adjacent the first reflective polarizer opposite the second reflective polarizer and a second prism with a second diagonal surface positioned adjacent the second reflective polarizer opposite the first reflective polarizer.

10. The system of claim 1 , wherein the polarization rotating reflector comprises a broadband mirror and quarter wave plate adjacent the broadband mirror.

11. The system of claim 1 , wherein the reflective imager comprises an LCoS imager.

12. The system of claim 1 , wherein the imaged light is directed towards a viewer with an effective pixel resolution of less than 12 microns.

13. The system of claim 12 , wherein the imaged light is directed towards a viewer with an effective pixel resolution of less than 6 microns.

14. The system of claim 1 , further comprising a post-polarizer positioned such that imaged light intercepts the post-polarizer at an angle of about 90 degrees after being reflected from the second reflective polarizer.

15. The system of claim 1 , further comprising a projection lens positioned such that imaged light intercepts the projection lens at an angle of about 90 degrees after being reflected from the second reflective polarizer.

16. The system of claim 1 , further comprising a projection lens positioned such that imaged light intercepts the projection lens at an angle of about 90 degrees after being transmitted through the second and first reflective polarizers.

17. A system comprising:
an optical component, comprising:
a first prism having a first diagonal surface;

a first reflective polarizer adjacent the first diagonal surface and disposed to reflect light having a first polarization state and transmit light having a second polarization state different from the first polarization state;
a second reflective polarizer adjacent the first reflective polarizer opposite the first prism and disposed to reflect light having the first polarization state and transmit light having the second polarization state; and,
a second prism having a second diagonal surface disposed so that the second diagonal surface is adjacent the second reflective polarizer opposite the first reflective polarizer;
wherein the first reflective polarizer is a polymeric reflective polarizer and the second reflective polarizer comprises inorganic dielectric layers or a wire grid;

a light source emitting light towards the optical component, light from the light source intercepting the first reflective polarizer at an angle of about 45 degrees, wherein light intercepting the first reflective polarizer and having the first polarization state is reflected from the first reflective polarizer;
a polarization rotating reflector disposed adjacent the first prism so that the light reflected from the first reflective polarizer intercepts the polarization rotating reflector at an angle of about 90 degrees; the light being reflected towards the first reflective polarizer and converted to the second polarization state; and,
a reflective imager disposed adjacent the second prism opposite the polarization rotating reflector so that the light reflected from the polarization rotating reflector passes through the first and second reflective polarizers and intercepts the reflective imager at an angle of about 90 degrees and is imaged;
wherein an imaged light is reflected from the reflective imager, intercepts the second reflective polarizer at an angle of about 45 degrees, is reflected and exits the system.

18. The system of claim 17 , wherein the second prism comprises optical glass and the second reflective polarizer comprises inorganic dielectric layers deposited onto the second diagonal surface.

19. The system of claim 17 , further comprising an optically clear adhesive positioned between the first reflective polarizer and the first prism.

20. The system of claim 19 , wherein the optically clear adhesive comprises a pressure sensitive adhesive.

21. The system of claim 17 , further comprising an optically clear adhesive positioned between the first reflective polarizer and the second reflective polarizer.

22. The system of claim 21 , wherein the optically clear adhesive comprises a pressure sensitive adhesive.

23. The system of claim 17 , further comprising a projection lens positioned such that imaged light intercepts the projection lens at an angle of about 90 degrees after being reflected from the second reflective polarizer.

24. The system of claim 17 , wherein the imaged light is directed towards a viewer with an effective pixel resolution of less than 12 microns.

25. The system of claim 24 , wherein the imaged light is directed towards a viewer with an effective pixel resolution of less than 6 microns.

26. The system of claim 17 , further comprising a post-polarizer positio

Assignees

• 3M Innovative Properties Co

Inventors

• Watson Philip E
• Poon Yarn Chee
• Ouderkirk Andrew J

Classifications

• H04N9/3167

  for polarizing the light beam (polarizing optical systems per se G02B27/28) · CPC title

• G02F1/133528

  Polarisers · CPC title

• G02B27/283 Primary

  used for beam splitting or combining · CPC title

• H04N5/7441

  the modulator being an array of liquid crystal cells · CPC title

• G03B21/2073

  Polarisers in the lamp house (peculiar to electronic spatial light modulators H04N9/3197) · CPC title