Direct view deformable mirror device

• US 5,517,347 A
• Filed: 12/01/1993
• Issued: 05/14/1996
• Est. Priority Date: 12/01/1993
• Status: Expired due to Term

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Sampsell, Jeffrey B.
• Primary Examiner(s): Shafer, Ricky D.
• Application Number:
  US08/159,963
• Time in Patent Office: 895 Days
• Field of Search: 359/224, 359/225, 359/291, 359/318, 359/853, 359/855, 359/865, 359/900, 359/891, 385/17, 385/33, 385/115, 385/116, 385/119, 385/120, 385/18
• US Class Current: 359/224.1
• CPC Class Codes: G02B 26/0841 the reflecting element being moved or deformed by electrostatic means
• CPC Class Codes: Y10S 359/90 Methods

Abstract

A faceplate (10a) for directly viewing an image generated by a digital micromirror device (10b), which generates images by tilting tiny mirror elements (11) to on or off positions. The faceplate (10a) has a number of optical fibers (12) parallel to each other and closely spaced together. The ends of the optical fibers (12) are the top and bottom surfaces of the faceplate (10a). Both ends of each fiber (12) is sliced at an angle determined by the on position of the mirror elements (11). This permits light to travel down the fibers (12) and be reflected back to the viewer by only those mirror elements (11) that are on.

Claims

1. A method of directly viewing an image generated by a digital micromirror device (DMD) having mirror elements that tilt to an on tilt angle, comprising the steps of:

forming both ends of a number of optical fibers at a bias angle that is determined by said on tilt angle;

grouping said optical fibers into a faceplate having a planar bottom surface and a planar top surface defined by said ends;

placing said bottom surface parallel to and near the reflective surface of said DMD; and

viewing an image generated by said DMD at said top surface.

2. The method of claim 1, further comprising the step of placing a transparent color filter of differently colored sections of material directly above or directly below said faceplate.

3. The method of claim 1, further comprising the step of aligning said optical fibers with said mirror elements.

4. The method of claim 1, wherein said grouping step is accomplished by grouping a number of fibers that is approximately the same as the number of mirror elements.

5. The method of claim 1, wherein said grouping step is accomplished by grouping a number of fibers that exceeds the number of mirror elements.

6. The method of claim 1, wherein said grouping step is accomplished by grouping a number of fibers that is less than the number of mirror elements.

7. The method of claim 1, further comprising the step of placing a light source between said faceplate and said DMD at an edge of said faceplate in the direction of said bias angle.

8. The method of claim 7 wherein said light source is a set of differently colored light sources, and further comprising the step of sequentially activating said light sources in accordance with data being delivered to said DMD.

9. A direct view display system, comprising:

a digital micromirror device for generating images by tilting an array of mirrors to on or off tilt angles;

an image data processing system for generating image data representing said image and for delivering said data to said digital micromirror device; and

a faceplate having a number of optical fibers, attached together such that they are parallel to each other and closely spaced, wherein said fibers are of equal length so as to provide a planar shape of said faceplate, and wherein the end surfaces of said fibers comprise an upper and a lower surface of said faceplate, and wherein said optical fibers have a bias angle with respect to the plane of said faceplate that is determined by said tilt angle of said mirror elements.

10. The direct view display system of claim 9, wherein said faceplate has a bias angle of approximately ninety degrees minus the value of said tilt angle.

11. The direct view display system of claim 9, further comprising a light source between said faceplate and said DMD at a side of said DMD corresponding to the direction of said bias angle.

12. The direct view display system of claim 9, further comprising a transparent color filter at the upper or lower surface of said faceplate, said color filter having sections of differently colored material.