Display device

• US 20060033676A1
• Filed: 08/10/2004
• Published: 02/16/2006
• Est. Priority Date: 08/10/2004
• Status: Abandoned Application

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: McKinnell, James, Morehouse, Charles C., Liebeskind, John, Faase, Kenneth, Weber, Timothy L.
• Application Number:
  US10/915,753
• Publication Number:
  US 20060033676A1
• Time in Patent Office: Days
• US Class Current: 345/30
• CPC Class Codes: G02B 26/02 for controlling the intensity of light G02B26/004 takes precedence

Abstract

A display device includes a base and light valve components formed over the base. The base includes electrical circuitry. Each of the light valve components includes a chamber that defines an optical path, particles within the chamber, and a mechanism for transversely repositioning the particles in relation to the optical path in response to voltages provided by the electrical circuitry.

Claims

1. A display device including:

a base including electrical circuitry; and

light valve components formed over the base, each of the light valve components including a chamber that defines an optical path, particles within the chamber, and means for transversely repositioning the particles in relation to the optical path in response to voltages provided by the electrical circuitry.

2. The display device of claim 1, wherein the base is substantially transparent.

3. The display device of claim 1, wherein the base includes an array of microlenses.

4. The display device of claim 1, wherein the particles are nanoparticles.

5. The display device of claim 1, wherein the particles are approximately 1-10 μ

m in diameter.

6. The display device of claim 1, wherein the particles are substantially opaque.

7. The display device of claim 1, wherein the particles are toner particles.

8. The display device of claim 1, wherein each of the light valve components further includes a liquid within the chamber.

9. The display device of claim 8, wherein the particles are selected depending upon a terminal velocity of the particles in the liquid as a function of particle size.

10. The display device of claim 1, wherein each of the light valve components further includes a gas within the chamber.

11. The display device of claim 10, wherein the particles are selected depending upon a terminal velocity of the particles in the gas as a function of particle size.

12. The display device of claim 1, wherein the particles are charged, and the means for transversely repositioning includes electrodes.

13. The display device of claim 12, wherein the electrodes are formed over the base.

14. The display device of claim 12, wherein the electrodes include a center electrode positioned within the optical path, the center electrode including a reflective surface facing away from the base, and an outer electrode positioned around the center electrode.

15. The display device of claim 14, wherein the center and outer electrodes are substantially planar.

16. The display device of claim 14, further including:

an array of microlenses positioned adjacent to the light valve components such that, for each of the light valve components, one of the microlenses directs light along the optical path and incident upon the center electrode.

17. The display device of claim 14, wherein, for each of the light valve components, the outer electrode includes an inner wall that extends above and is substantially perpendicular to the reflective surface of the center electrode.

18. The display device of claim 12, wherein the electrodes include a center electrode positioned within the light path, the center electrode being substantially transparent, and an outer electrode positioned around the center electrode.

19. The display device of claim 18, wherein the center electrode and the outer electrode are substantially planar.

20. The display device of claim 18, wherein the center electrode includes a surface facing away from the base, and the outer electrode includes an inner wall that is substantially perpendicular to the surface.

21. A display device including:

a substrate including electrical circuitry; and

light valves formed over the substrate, each of the light valves including

a chamber that defines an optical path,

charged particles within the chamber,

a center electrode positioned within the optical path, the center electrode including a reflective surface facing away from the substrate, and

an outer electrode positioned around the center electrode;

wherein the electrical circuitry is configured to apply electrical potentials to one or more of the center and outer electrodes of each of the light valves such that the charged particles in each of the light valves will be selectively drawn to the center electrode or to the outer electrode.

22. The display device of claim 21, wherein, for each of the light valves, the center electrode and the outer electrode are formed over the substrate and are substantially planar.

23. The display device of claim 22, further including:

an array of microlenses positioned adjacent to the light valves such that, for each of the light valves, one of the microlenses directs light along the optical path and incident upon the center electrode.

24. The display device of claim 21, wherein, for each of the light valves, the center electrode and the outer electrode are formed over the substrate, and the outer electrode includes an inner wall that extends above and is substantially perpendicular to the reflective surface.

25. The display device of claim 21, wherein the particles are nanoparticles.

26. The display device of claim 21, wherein the particles are approximately 1-10 μ

m in diameter.

27. The display device of claim 21, wherein the particles are substantially opaque.

28. The display device of claim 21, wherein the particles are toner particles.

29. The display device of claim 21, wherein each of the light valves further includes a liquid within the chamber.

30. The display device of claim 29, wherein the particles are selected depending upon a terminal velocity of the particles in the liquid as a function of particle size.

31. The display device of claim 21, wherein each of the light valves further includes a gas within the chamber.

32. The display device of claim 31, wherein the particles are selected depending upon a terminal velocity of the particles in the gas as a function of particle size

33. A display device including:

a base including electrical circuitry, the base being substantially transparent;

a cover that is substantially transparent; and

light valves between the base and the cover, each of the light valves including

a chamber that defines an optical path,

charged particles within the chamber,

a center electrode positioned within the optical path, the center electrode being substantially transparent, and

an outer electrode positioned around the center electrode;

wherein the electrical circuitry is configured to apply electrical potentials to one or more of the center and outer electrodes of each of the light valves such that the charged particles in each of the light valves will be selectively drawn to the center electrode or to the outer electrode.

34. The display device of claim 33, wherein, for each of the light valves, the center electrode and the outer electrode are formed over the base and are substantially planar.

35. The display device of claim 34, wherein the base includes a base array of microlenses positioned adjacent to the light valves such that, for each of the light valves, one of the microlenses redirects light entering the light valve.

36. The display device of claim 34, wherein the cover includes a cover array of microlenses positioned adjacent to the light valves such that, for each of the light valves, one of the microlenses redirects light exiting the light valve.

37. The display device of claim 33, wherein, for each of the light valves, the center electrode and the outer electrode are formed over the base, the center electrode includes a top surface facing the cover, and the outer electrode includes an inner wall that extends above and is substantially perpendicular to the top surface.

38. The display device of claim 33, wherein the particles are nanoparticles.

39. The display device of claim 33, wherein the particles are approximately 1-10 μ

m in diameter.

40. The display device of claim 33, wherein the particles are substantially opaque.

41. The display device of claim 33, wherein the particles are toner particles.

42. The display device of claim 33, wherein each of the light valves further includes a liquid within the chamber.

43. The display device of claim 42, wherein the particles are selected depending upon a terminal velocity of the particles in the liquid as a function of particle size.

44. The display device of claim 33, wherein each of the light valves further includes a gas within the chamber.

45. The display device of claim 44, wherein the particles are selected depending upon a terminal velocity of the particles in the gas as a function of particle size.

46. A display device including:

a substrate that is substantially transparent and flexible, the substrate including electrical circuitry; and

light valve components formed over the substrate, each of the light valve components including a chamber that defines an optical path, particles within the chamber, and means for transversely repositioning the particles in relation to the optical path in response to voltages provided by the electrical circuitry.

47. The display device of claim 46, wherein the substrate is made of a plastic material.

48. The display device of claim 46, wherein the particles are nanoparticles.

49. The display device of claim 46, wherein the particles are approximately 1-10 μ

m in diameter.

50. The display device of claim 46, wherein the particles are substantially opaque.

51. The display device of claim 46, wherein the particles are toner particles.

52. The display device of claim 46, wherein each of the light valve components further includes a liquid within the chamber.

53. The display device of claim 52, wherein the particles are selected depending upon a terminal velocity of the particles in the liquid as a function of particle size.

54. The display device of claim 46, wherein each of the light valve components further includes a gas within the chamber.

55. The display device of claim 54, wherein the particles are selected depending upon a terminal velocity of the particles in the gas as a function of particle size.

56. The display device of claim 46, wherein the particles are charged, and the means for transversely repositioning includes electrodes.

57. The display device of claim 56, wherein the electrodes are formed over the substrate.

58. The display device of claim 56, wherein the electrodes include a center electrode positioned within the light path, the center electrode being substantially transparent, and an outer electrode positioned around the center electrode.

59. The display device of claim 58, wherein the center electrode includes a surface facing away from the substrate, and the outer electrode includes an inner wall that extends above and is substantially perpendicular to the surface.

60. The display device of claim 46, wherein the light valve components are configured to provide tri-color pixels.

61. A spatial light modulator (SLM) including:

an array of MEMS-based light valves individually controlled to vary in transmissivity via repositioning of charged particles within the MEMS-based light valves.

62. The spatial light modulator (SLM) of claim 61, wherein each of the light valves defines an optical path and includes a reflective electrode that is fixed in position within the optical path.

63. The spatial light modulator (SLM) of claim 61, wherein each of the light valves defines an optical path and includes a substantially transparent electrode that is fixed in position within the optical path.

64. A method of using a display device including:

providing a display device with actuated particle engines; and

using the actuated particle engines to generate pixels for an image to be displayed by the display device.

65. A method of making a display device including:

providing a substrate; and

fabricating on the substrate actuated particle engines, absent driving logic, with a single MEMS mask layer.

66. A method of making a display device including:

providing a substrate that includes integrated electronics;

fabricating light engines on the substrate, each of the light engines including a chamber, which defines an optical path through the light engine, and electrodes that are electrically connected to the integrated electronics;

providing transparent covers for the light engines;

selecting charged particles that are substantially opaque; and

sealing the charged particles within the chambers such that output voltages applied to the electrodes by the integrated electronics cause the charged particles to move transversely across the optical paths.

67. The method of making a display device of claim 66, wherein the charged particles along with a solvent are sealed within the chambers, and the charged particles are selected depending upon a relationship between a size and a terminal velocity of the particles in the solvent.