TIR light valve

• US 7,808,697 B2
• Filed: 01/02/2009
• Issued: 10/05/2010
• Est. Priority Date: 12/09/2005
• Status: Expired due to Fees

• Current Assignee: Rambus Delaware LLC (Rambus Inc.)
• Original Assignee: Rambus International Ltd (Rambus Inc.)
• Inventors: Richardson, Brian Edward
• Primary Examiner(s): Thompson; Timothy J
• Application Number:
  US12/319,173
• Publication Number:
  US 20090116099A1
• Time in Patent Office: 641 Days
• Field of Search: 359/237, 359/154, 359/155, 359/227, 359/529, 372/12, 372/99
• US Class Current: 359/320
• CPC Class Codes: G02B 26/0875 by means of one or more refracting elements
• CPC Class Codes: G02B 26/0883 the refracting element being a prism

Abstract

An array of light valves switch light by enabling and disabling total internal reflection (TIR) on a surface of the light valve. The disabling of the TIR is accomplished by putting another optical element in contact with the surface and then diffusing or changing the direction of the light. The mechanical mechanism to move the optical element is a simple one in that it only moves the optical element a small distance to change the valve from a first position to a second position.

Claims

1. A light valve device comprising:

an array of light valves, at least one of the light valves including;

a light bending mechanism having an index of refraction greater than an index of refraction of an area adjacent to the light bending mechanism, so that light projected onto a first surface of the light bending mechanism is reflected off a second surface of the light bending mechanism;

a switch element including at least one serrated reflecting surface; and

a moving mechanism to move the at least one serrated reflecting surface of the switch element relative to the second surface of the light bending mechanism,

wherein when the switch element is in a first position, light passing through the first surface of the light bending mechanism reflects off of the second surface of the light bending mechanism and passes through an output surface of the light bending mechanism, and

when the switch element is in a second position, the at least one serrated reflecting surface is moved to a position touching or in close proximity to the second surface of the light bending mechanism, so that light passing through the first surface of the light bending mechanism is not reflected off the second surface, but rather continues on to the at least one serrated reflecting surface of the switch element, the at least one serrated reflecting surface reflecting the light.

2. The light valve of claim 1, wherein light is absorbed by at least one switch element when the switch element is in the second position.

3. The light valve of claim 1, wherein at least one switch element diffuses light when the switch element is in the second position.

4. The light valve of claim 1, wherein at least one switch element has a diffuse topography so that light is not reflected to the output surface of the light bending mechanism.

5. The light valve of claim 1, wherein the light bending mechanism is a prism.

6. The light valve of claim 1, wherein at least one surface of at least one light bending mechanism is coated with an elastic material to ensure that a gap between the light bending mechanism and the switch element is sufficiently narrow.

7. The light valve of claim 1, wherein at least one surface of at least one switch element is coated with an elastic material to ensure that a gap between the light bending mechanism and the switch element is sufficiently narrow.

8. The light valve of claim 1, wherein an electrostatic force is used to move at least one switch element between the first position and the second position.

9. The light valve of claim 1, wherein a spring force is used to move at least one switch element between the first position and the second position.

10. A light valve device comprising:

an array of light valves, at least one of the light valves including;

a light bending mechanism having an index of refraction greater than an index of refraction of an area adjacent to the light bending mechanism, so that light projected onto a first surface of the light bending mechanism is reflected off a second surface of the light bending mechanism;

a switch element including a reflecting surface; and

a moving mechanism to move the reflecting surface of the switch element relative to the second surface of the light bending mechanism,

wherein when the switch element is in a first position, light passing through the first surface of the light bending mechanism reflects off of the second surface of the light bending mechanism and passes through an output surface of the light bending mechanism, and

when the switch element is in a second position, the reflecting surface is moved to a position touching or in close proximity to the second surface of the light bending mechanism, so that light passing through the first surface of the light bending mechanism is not reflected off the second surface, but rather continues on to a surface of the switch element, and light is absorbed by the switch element.

11. The light valve of claim 10, wherein at least one switch element diffuses light when the at least one switch element is in the second position.

12. The light valve of claim 10, wherein at least one switch element has a diffuse topography so that light is not reflected to the output surface of the light bending mechanism.

13. The light valve of claim 10, wherein the light bending mechanism is a prism.

14. The light valve of claim 10, wherein at least one surface of at least one light bending mechanism is coated with an elastic material to ensure that a gap between the at least one light bending mechanism and the at least one switch element is sufficiently narrow.

15. The light valve of claim 10, wherein at least one surface of at least one switch element is coated with an elastic material to ensure that a gap between the light bending mechanism and the at least one switch element is sufficiently narrow.

16. The light valve of claim 10, wherein an electrostatic force is used to move at least one switch element between the first position and the second position.

17. The light valve of claim 10, wherein a spring force is used to move at least one switch element between the first position and the second position.

18. A light valve device comprising:

an array of light valves, at least one of the light valves including;

a light bending mechanism having an index of refraction greater than an index of refraction of an area adjacent to the light bending mechanism, so that light projected onto a first surface of the light bending mechanism is reflected off a second surface of the light bending mechanism;

a switch element including a reflecting surface; and

a moving mechanism to move the reflecting surface of the switch element relative to the second surface of the light bending mechanism,

wherein when the switch element is in a first position, light passing through the first surface of the light bending mechanism reflects off of the second surface of the light bending mechanism and passes through an output surface of the light bending mechanism, and

when the switch element is in a second position, the reflecting surface is moved to a position touching or in close proximity to the second surface of the light bending mechanism, so that light passing through the first surface of the light bending mechanism is not reflected off the second surface, but rather continues on to a surface of the switch element, the switch element diffusing light.

19. The light valve of claim 18, wherein at least one switch element has a diffuse topography so that light is not reflected to the output surface of the light bending mechanism.

20. The light valve of claim 18, wherein the light bending mechanism is a prism.

21. The light valve of claim 18, wherein at least one surface of at least one light bending mechanism is coated with an elastic material to ensure that a gap between the at least one light bending mechanism and the switch element is sufficiently narrow.

22. The light valve of claim 18, wherein at least one surface of at least one switch element is coated with an elastic material to ensure that a gap between the light bending mechanism and the at least one switch element is sufficiently narrow.

23. The light valve of claim 18, wherein an electrostatic force is used to move at least one switch element between the first position and the second position.

24. The light valve of claim 18, wherein a spring force is used to move at least one switch element between the first position and the second position.

25. A light valve device comprising:

an array of light valves, at least one of the light valves including;

a light bending mechanism having an index of refraction greater than an index of refraction of an area adjacent to the light bending mechanism, so that light projected onto a first surface of the light bending mechanism is reflected off a second surface of the light bending mechanism;

a switch element including a reflecting surface; and

a moving mechanism to move the reflecting surface of the switch element relative to the second surface of the light bending mechanism,

wherein at least one switch element has a diffuse topography so that no light is reflected to the output surface of the light bending mechanism,

wherein when the at least one switch element is in a first position, light passing through the first surface of the light bending mechanism reflects off of the second surface of the light bending mechanism and passes through an output surface of the light bending mechanism, and

when the at least one switch element is in a second position, the reflecting surface is moved to a position touching or in close proximity to the second surface of the light bending mechanism, so that light passing through the first surface of the light bending mechanism is not reflected off the second surface, but rather continues on to a surface of the at least one switch element.

26. The light valve of claim 25, wherein the light bending mechanism is a prism.

27. The light valve of claim 25, wherein at least one surface of at least one light bending mechanism is coated with an elastic material to ensure that a gap between the at least one light bending mechanism and the switch element is sufficiently narrow.

28. The light valve of claim 25, wherein at least one surface of at least one switch element is coated with an elastic material to ensure that a gap between the light bending mechanism and the at least one switch element is sufficiently narrow.

29. The light valve of claim 25, wherein an electrostatic force is used to move at least one switch element between the first position and the second position.

30. The light valve of claim 25, wherein a spring force is used to move at least one switch element between the first position and the second position.

31. A light valve device comprising:

an array of light valves, at least one of the light valves including;

a light bending mechanism having an index of refraction greater than an index of refraction of an area adjacent to the light bending mechanism, so that light projected onto a first surface of the light bending mechanism is reflected off a second surface of the light bending mechanism;

a switch element including a reflecting surface; and

a moving mechanism to move the reflecting surface of the switch element relative to the second surface of the light bending mechanism,

wherein at least one surface of at least one light bending mechanism is coated with an elastic material to ensure that a gap between the at least one light bending mechanism and the switch element is sufficiently narrow,

wherein when the switch element is in a first position, light passing through the first surface of the light bending mechanism reflects off of the second surface of the light bending mechanism and passes through an output surface of the light bending mechanism, and

when the switch element is in a second position, the reflecting surface is moved to a position touching or in close proximity to the second surface of the light bending mechanism, so that light passing through the first surface of the light bending mechanism is not reflected off the second surface, but rather continues on to a surface of the switch element.

32. The light valve of claim 31, wherein the light bending mechanism is a prism.

33. The light valve of claim 31, wherein at least one surface of at least one switch element is coated with an elastic material to ensure that a gap between the light bending mechanism and the at least one switch element is sufficiently narrow.

34. The light valve of claim 31, wherein an electrostatic force is used to move at least one switch element between the first position and the second position.

35. The light valve of claim 31, wherein a spring force is used to move at least one switch element between the first position and the second position.

36. A light valve device comprising:

an array of light valves, at least one of the light valves including;

a light bending mechanism having an index of refraction greater than an index of refraction of an area adjacent to the light bending mechanism, so that light projected onto a first surface of the light bending mechanism is reflected off a second surface of the light bending mechanism;

a switch element including a reflecting surface; and

a moving mechanism to move the reflecting surface of the switch element relative to the second surface of the light bending mechanism,

wherein at least one surface of at least one switch element is coated with an elastic material to ensure that a gap between the light bending mechanism and the at least one switch element is sufficiently narrow,

wherein when the at least one switch element is in a first position, light passing through the first surface of the light bending mechanism reflects off of the second surface of the light bending mechanism and passes through an output surface of the light bending mechanism, and

when the at least one switch element is in a second position, the reflecting surface is moved to a position touching or in close proximity to the second surface of the light bending mechanism, so that light passing through the first surface of the light bending mechanism is not reflected off the second surface, but rather continues on to a surface of the at least one switch element.

37. The light valve of claim 36, wherein the light bending mechanism is a prism.

38. The light valve of claim 36, wherein an electrostatic force is used to move at least one switch element between the first position and the second position.

39. The light valve of claim 36, wherein a spring force is used to move at least one switch element between the first position and the second position.