Polarization preserving projection screen with engineered pigment and method for making same

• US 20110149390A1
• Filed: 12/22/2010
• Published: 06/23/2011
• Est. Priority Date: 12/22/2009
• Status: Active Grant

• Current Assignee: RealD Incorporated
• Original Assignee: RealD Incorporated
• Inventors: Coleman, David, Petersen, Joel, Rich, Christopher, Sharp, Gary D., Lewandowski, Raymond Jacob
• Granted Patent: US 8,169,699 B2
• Time in Patent Office: Days
• US Class Current: 359/452
• CPC Class Codes: B29D 11/0074 Production of other optical elements not provided for in B29D11/00009- B29D11/0073
• CPC Class Codes: G03B 21/604 Polarised screens
• CPC Class Codes: Y10T 156/1142 Changing dimension during delaminating [e.g., crushing, expanding, warping, etc.]

Abstract

Polarization preserving projection screens provide optimum polarization preservation for 3D viewing. The projection screens additionally provide improved light control for enhanced brightness, uniformity, and contrast for both 2D and 3D systems. Generally, the disclosed method for providing a projection screen comprises stripping an optically functional material from a carrier substrate, thus creating engineered particles from the optically functional material. The engineered particles may then be deposited on a second substrate to create a substantially homogeneous optical appearance of the projection screen.

Claims

1. A web shuffling method for providing a projection screen, the method comprising:

stripping optically functional material from a carrier substrate, wherein the stripping breaks the optically functional material into individual engineered particles; and

distributing a coating onto a second substrate to achieve a substantially homogeneous optical appearance of the projection screen, wherein the coating includes the individual engineered particles.

2. The method of claim 1, further comprising fabricating a base diffuser material, wherein the base diffuser material is adjacent to the optically functional material.

3. The method of claim 2, wherein fabricating the base diffuser material further comprises holding a predetermined tolerance, further wherein the predetermined tolerance is based on at least a difference between long-range statistics and ensemble statistics.

4. The method of claim 2, wherein distributing the coating provides a surface that substantially approximates that of the base diffuser material.

5. The method of claim 1, wherein distributing the coating is operable to substantially minimize the role of particle tipping statistics on the scatter profile of the coating.

6. The method of claim 1, wherein distributing the coating further comprises producing a dense stack of the individual engineered particles lying substantially in-plane at the surface of the coating.

7. The method of claim 1, further comprising maintaining a high particle-to-feature ratio for the individual engineered particles.

8. A projection screen with a substantially homogeneous appearance, wherein the substantially homogeneous appearance is achieved through web shuffling, the projection screen comprising:

a substrate; and

a coating adjacent to the substrate, the coating comprising engineered particles created by stripping an optically functional material from a carrier substrate, wherein the engineered particles are operable to primarily determine the scattering behavior of light.

9. The projection screen of claim 8, wherein the carrier substrate is a sacrificial carrier substrate.

10. The projection screen of claim 8, wherein the morphology of the engineered particles may be operable to primarily, statistically determine the macroscopic scatter behavior of the projection screen.

11. The projection screen of claim 8, wherein the coating further comprises a surface operable to decouple the scatter profile from the polarization contrast ratio of the projection screen.

12. The projection screen of claim 8, wherein the optically functional material is produced using a diffuser.

13. The projection screen of claim 12, wherein the diffuser is adjacent to the carrier substrate.

14. The projection screen of claim 12, wherein the optically functional material further comprises at least a first optical coating.

15. The projection screen of claim 14, wherein the first optical coating is adjacent to the diffuser prior to stripping the optically functional material from the carrier substrate.

16. The projection screen of claim 8, wherein the optically functional material further comprises at least a second optical coating.

17. The projection screen of claim 16, wherein the second optical coating is a dielectric coating.

18. The projection screen of claim 16, wherein the second optical coating is adjacent to the diffuser prior to stripping the optically functional material from the carrier substrate.

19. The projection screen of claim 14, wherein the first optical coating is a release layer.

20. The projection screen of claim 8, further comprising a reflective layer.

21. The projection screen of claim 20, wherein the reflective layer is substantially composed of aluminum.

22. The projection screen of claim 20, wherein the optically functional material further comprises a third optical coating adjacent to the reflective layer.

23. The projection screen of claim 22, wherein the third optical coating is a dielectric coating.

24. The projection screen of claim 8, wherein the engineered particles further comprise a sandwich structure, wherein the sandwich structure includes a plurality of optical coatings on at least a first side of a reflective layer.

25. The projection screen of claim 8, wherein the engineered particles are within a predetermined size range.

26. The projection screen of claim 25, wherein the engineered particles are resized if the engineered particles are outside the predetermined size range.

27. The projection screen of claim 8, further comprising a fluid, wherein the fluid is combined with the engineered particles.

28. The projection screen of claim 27, wherein the fluid combined with the engineered particles is deposited onto a substrate.

29. A method for providing a projection screen, the method comprising:

stripping an optically functional material from a first carrier substrate;

creating engineered particles from the optically functional material; and

depositing the engineered particles on a second substrate to create a substantially homogeneous optical appearance of the projection screen.

30. The method of claim 29, further comprising utilizing a diffuser to provide the optically functional material, wherein the diffuser is adjacent to the first carrier substrate.

31. The method of claim 29, further comprising depositing at least a first optical coating, wherein the first optical coating is adjacent to the diffuser.

32. The method of claim 31, further comprising depositing a second optical coating.

33. The method of claim 32, wherein the second optical coating is a dielectric coating.

34. The method of claim 32, wherein the first optical coating is a release layer

35. The method of claim 29, further comprising depositing a reflective layer.

36. The method of claim 35, wherein the reflective layer is substantially composed of aluminum.

37. The method of claim 35, further comprising depositing a third optical coating adjacent to the reflective layer.

38. The method of claim 36, wherein the third optical coating is a dielectric coating.

39. The method of claim 29, further comprising creating the optically functional material by forming a sandwich structure, wherein the sandwich structure includes optical coatings on at least a first side of a reflective layer.

40. The method of claim 29, further comprising verifying the engineered particles are approximately within a predetermined size range.

41. The method of claim 40, wherein verifying the engineered particles further comprises resizing the engineered particles when the engineered particles are not approximately within the predetermined size range.

42. The method of claim 29, further comprising combining the engineered particles with a fluid.

43. The method of claim 29, further comprising depositing the fluid with the engineered particles onto a substrate.

44. A projection system comprising:

a projection screen with a substantially homogeneous appearance, wherein the substantially homogeneous appearance is achieved through web shuffling, the projection screen comprising a substrate and a coating adjacent to the substrate, the coating comprising engineered particles created by stripping an optically functional material from a carrier substrate; and

a light projection system directing light in the direction of the projection screen.