Optical waveguide display system

• US 5,009,483 A
• Filed: 07/25/1989
• Issued: 04/23/1991
• Est. Priority Date: 04/12/1989
• Status: Expired due to Fees

• Current Assignee: Marshall A. Rockwell III
• Original Assignee: Marshall A. Rockwell III
• Inventors: Rockwell, Marshall A. III
• Primary Examiner(s): Gonzalez, Frank
• Application Number:
  US07/385,910
• Time in Patent Office: 637 Days
• Field of Search: 350/96.1, 350/96.11, 350/96.12, 350/96.13, 350/96.14, 350/96.15, 350/96.16, 350/96.19, 350/96.24, 350/96.25, 358/901, 40/547, 362/32
• US Class Current: 385/116
• CPC Class Codes: G02B 6/0033 Means for improving the coupling-out of light from the light guide
• CPC Class Codes: G02B 6/0065 Manufacturing aspects; Material aspects
• CPC Class Codes: G02B 6/08 with fibre bundle in form of plate
• CPC Class Codes: G02F 1/011 in optical waveguides, not otherwise provided for in this subclass
• CPC Class Codes: G02F 1/0147 based on thermo-optic effects G02F1/132 takes precedence
• CPC Class Codes: G02F 1/03 based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect G02F1/061 takes precedence
• CPC Class Codes: G02F 1/09 based on magneto-optical elements, e.g. exhibiting Faraday effect
• CPC Class Codes: G02F 1/11 based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves acousto-optical deflection G02F1/33
• CPC Class Codes: G02F 1/1326 Liquid crystal optical waveguides or liquid crystal cells specially adapted for gating or modulating between optical waveguides
• CPC Class Codes: G09F 9/305 being the ends of optical fibres G09F9/302 takes precedence
• CPC Class Codes: H01J 29/892 using fibre optics

Abstract

A thin-panel, large, high-definition television screen employs optical waveguides. Light (32) flows through waveguides (28) arranged, in parallel, across a substrate (64). Light from a source (44) is coupled into the waveguides using a Graded Index (GRIN) microlens array (56). Taps (37) direct light out and make it visible at different locations along the length of the waveguides. Long interaction length (8) taps with reflectors (10) are introduced which enable many waveguides to be staggered and placed side-by-side to maintain high screen resolutions. Polymers, both electro-optic and non-electro-optic, are used in the preferred embodiment as a waveguide building material. However, acousto-optic, thermo-optic (86) and magneto-optic effects may also be used with other materials such as glass and silicon dioxide. This display can be economically produced by forming a flexible waveguide ribbon (62) which integrates multiple waveguides (1), intensity modulators (40) and taps (38) into a single unit. Waveguide display manufacturing techniques based on thermo-poling (100), photolocking (114), extrusion (124), and preform fiber-drawing (132) are also presented.

Claims

1. A visual optical switching element comprising:

a first elongated transparent optical material,

a second elongated optical material,

said first and said second optical materials arranged alongside each other,

a light source positioned in a light coupling relationship to said first elongated optical material,

a means for causing some of the light traveling through said first optical material from said light source to exit selectively into said second optical material so light can be observed by a viewer,

a means of altering the path taken by light traveling through said second optical material,

said path altering means consisting of a plurality of abrupt discontinuities formed in said second optical material.

2. The visual optical switching element as claimed in claim 1 in which said abrupt discontinuities comprise indentations formed in at least one part of the surface of said second optical material.

3. The visual optical switching element as claimed in claim 2 in which said indentations are at least partially covered with a light reflective material.

4. The visual optical switching element as claimed in claim 2 in which said indentations are filled with a light scattering material.

5. The visual optical switching element as claimed in claim 1 in which said first optical material comprises an optical waveguide.

6. The visual optical switching element as claimed in claim 1 in which said second optical material guides light from said first optical material a substantial distance before reaching an abrupt discontinuity.

7. The visual optical switching element as claimed in claim 1 in which said selective light exiting means is one of electro-optic, acousto-optic, magneto-optic, and thermo-optic devices.

8. A display system comprising:

a plurality of parallel optical waveguides,

a plurality of controllable light emitting regions of approximately uniform size and shape,

said controllable light emitting regions spaced apart along the length of each individual waveguide in said plurality of optical waveguides,

said controllable light emitting regions offset a distance oriented along the direction of light travel through said plurality of waveguides such that said light emitting regions associated with adjacent waveguides are not situated directly next to each other.

9. The display system as claimed in claim 8 in which said controllable light emitting regions are approximately the size of the core diameter of the individual waveguides in said plurality of waveguides.

10. The display system as claimed in claim 9 in which said controllable light emitting regions are spaced relatively far apart along the length of the waveguides when compared with the size of the light emitted from said controllable light emitting regions.

11. The display system as claimed in claim 8 in which said controllable light emitting regions is one of acousto-optic, electro-optic, thermo-optic and magneto-optic devices.

12. The display system as claimed in claim 9 in which light from said controllable light emitting regions is passed through a light diffusing material.

13. The display system as claimed in claim 8 in which light from said light source is directed into the cores of said plurality of waveguides with at least one graded index lens.

14. A display system comprising:

a plurality of parallel optical waveguides,

a plurality of controllable light emitting regions of approximately uniform size and shape,

said controllable light emitting regions spaced apart along the length of each individual waveguide in said plurality of optical waveguides,

in which said controllable light emitting regions are staggered on separate waveguides so high screen area pixel resolutions can be achieved while using long interaction length taps.

15. The display system as claimed in claim 14 in which said controllable light emitting regions are one of electro-optic, acousto-optic, magneto-optic, and thermo-optic devices.

16. A display system comprising:

a plurality of solid optical waveguides,

a light source positioned in a light coupling relationship to said plurality of optical waveguides,

and a thermo-optic light exiting means for causing a portion of light traveling through said plurality of solid optical waveguides to exit selectively so light can be viewed at selected locations oriented along the lengths of the waveguides in said plurality of waveguides.

17. The display system as claimed in claim 16 in which a controllable heating element is placed in proximity to said plurality of solid optical waveguides.

18. The display system as claimed in claim 16 in which said thermo-optic light exiting means comprises two waveguides which are placed in close proximity.

19. The display system as claimed in claim 18 in which a controllable heating element is placed in proximity to said two waveguides.

20. The display system as claimed in claim 18 in which light is abruptly removed from one of said two waveguides.

21. A display system comprising:

a plurality of regularly spaced parallel optical waveguides,

a plurality of separate electrodes which control the amount of light flowing through said plurality of optical waveguides,

each individual electrode in said plurality of separate electrodes configured to only control the amount of light flowing through a single waveguide in said plurality of optical waveguides,

said plurality of separate electrode elements shaped so the electrode extends a distance normal to the direction of light flow through said plurality of optical waveguides,

said electrode distance exceeding the closest distance separating two adjacent parallel waveguides in said plurality of regularly spaced optical waveguides.

22. The display as claimed in claim 21 in which said electrodes are opaque.

23. The display as claimed in claim 21 in which said electrodes are transparent.