Thin display optical projector

• US 6,002,826 A
• Filed: 08/28/1998
• Issued: 12/14/1999
• Est. Priority Date: 08/28/1998
• Status: Expired due to Term

• Current Assignee: Brookhaven Science Associates, LLC (Government of the United States of America)
• Original Assignee: Brookhaven Science Associates, LLC (Government of the United States of America)
• Inventors: Veligdan, James T.
• Primary Examiner(s): Palmer, Phan T. H.
• Application Number:
  US09/141,975
• Time in Patent Office: 473 Days
• Field of Search: 385/115, 385/116, 385/119, 385/120, 385/121, 385/901, 349/62, 349/95, 362/554, 362/556, 362/560
• US Class Current: 385/120
• CPC Class Codes: G02B 6/06 the relative position of the fibres being the same at both ends, e.g. for transporting images
• CPC Class Codes: G02B 6/08 with fibre bundle in form of plate

Abstract

An optical system (20) projects light into a planar optical display (10). The display includes laminated optical waveguides (12) defining an inlet face (14) at one end and an outlet screen (16) at an opposite end. A first mirror (26) collimates light from a light source (18) along a first axis, and distributes the light along a second axis. A second mirror (28) collimates the light from the first mirror along the second axis to illuminate the inlet face and produce an image on the screen.

Claims

1. An optical system 20 for projecting light into an optical display panel 10 including a plurality of laminated optical waveguides 12 defining an inlet face 14 at one end and an outlet screen 16 at an opposite end disposed obliquely thereto, comprising:

a light source 18;

a first mirror 26 for collimating light from said source 18 along a first axis, and distributing said light along a second axis; and

a second mirror 28 optically aligned with said first mirror 26 for collimating said light reflected therefrom along said second axis, and distributing said light to illuminate said inlet face and produce an image 22 on said screen 16.

2. A system according to claim 1 wherein said first and second mirrors 26, 28 are parabolic.

3. A system according to claim 2 further comprising a light modulator 30, 30a optically disposed between said light source 18 and said first mirror 26.

4. A system according to claim 3 wherein:

said modulator 30 has a width to height first aspect ratio;

said display inlet face 14 has a width to depth second aspect ratio different than said first aspect ratio;

said display screen 16 has a width to height third aspect ratio different than said second aspect ratio; and

said first and second mirrors 26, 28 are contoured to distribute said light from said modulator 30 across said display inlet face 14 to produce said image across said screen 16 in conformance of said first, second, and third aspect ratios.

5. A system according to claim 4 wherein:

said first mirror 26 is contoured to laterally expand said light from said modulator to match said inlet face 14; and

said second mirror 28 is contoured to stop said lateral expansion of said light from said first mirror 26 to match said inlet face 14.

6. A system according to claim 5 wherein said modulator comprises a digital micromirror device 30 optically aligned between said light source 18 and said first mirror 26 for selectively reflecting light therebetween.

7. A system according to claim 5 wherein said light source 18 is non-collimated.

8. A system according to claim 5 wherein said modulator comprises a liquid crystal display 30a optically aligned between said light source 18 and said first mirror 26 for selectively transmitting light therebetween.

9. A system according to claim 6 further comprising a color wheel 24 optically aligned between said light source 18 and said first mirror 26 for selectively coloring said light to produce a color image 22 on said screen.

10. A system according to claim 3 wherein said first and second mirrors 26, 28 are optically aligned in sequence with said display inlet face 14 to provide collimated, non-focused light laterally and transversely thereacross.

11. A method for projecting light into an optical display panel 10 including a plurality of laminated optical waveguides 12 defining an inlet face 14 at one end and an outlet screen 16 at an opposite end disposed obliquely thereto, comprising:

firstly reflecting light from a source 18 for laterally distributing said light along an axis; and

secondly reflecting said laterally distributed light for transversely distributing said light along another axis orthogonal with said one axis to illuminate said inlet face 14 and produce an image 22 on said screen 16.

12. A method according to claim 11 further comprising collimating said light as said light is firstly and secondly reflected.

13. A method according to claim 12 further comprising selectively modulating said light from said source 18 and prior to said first reflection thereof.

14. A method according to claim 13 further comprising selectively coloring said light from said source 18 and prior to said first reflection thereof.