Segmented directional backlight and related methods of backlight illumination

• US 9,250,448 B2
• Filed: 06/13/2012
• Issued: 02/02/2016
• Est. Priority Date: 11/19/2010
• Status: Active Grant

• Current Assignee: Reald Spark, LLC
• Original Assignee: RealD Incorporated
• Inventors: Robinson, Michael G.
• Primary Examiner(s): Chwasz, Jade R
• Application Number:
  US13/495,898
• Publication Number:
  US 20120314145A1
• Time in Patent Office: 1,329 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G02B 30/33 involving directional light or back-light sources
• CPC Class Codes: G02B 6/0048 with stepwise taper

Abstract

Backlit display systems, such as those employed with LED backlit displays, including those configured for autostereoscopic operation, may employ synchronization between the backlight and the presentation of sequential left and right eye images at a frame rate exceeding approximately 100 Hz. To successfully directionally illuminate isolated frames, the disclosed principles provide for segmenting the directional illumination and introducing a phase shifted, synchronized, pulsed drive scheme for the illumination segments. Accordingly, the principles disclosed herein are directed to segmented directional illumination systems and related techniques for segmented directional backlight illumination.

Claims

1. A segmented illumination system for use with an electronic stereoscopic display system having a sequentially scanning display, the segmented illumination system comprising:

a plurality of directional illumination segments corresponding to a plurality of display segments of the sequentially scanning display, the plurality of directional illumination segments arranged contiguously in a direction of the sequential scan;

a plurality of illumination units corresponding to each of the plurality of directional illumination segments for providing illumination to said corresponding illumination segments, the plurality of illumination segments thereby directionally illuminating the corresponding plurality of display segments in a first or second direction, wherein the plurality of illumination segments are physically isolated from one another;

wherein one or more first illumination units of each of said plurality of illumination units provide said illumination to corresponding one or more first directional illumination segments such that said corresponding one or more first directional illumination segments provide illumination in a first direction in synchronization with first-eye imagery provided by the corresponding plurality of display segments, and one or more second illumination units of each of the plurality of illumination units provide illumination to corresponding one or more second directional illumination segments such that said corresponding one or more second directional illumination segments provide illumination in a second direction in synchronization with second-eye imagery provided by the corresponding plurality of display segments.

2. A segmented illumination system in accordance with claim 1, wherein the first-eye and second-eye imagery is left eye and right eye imagery, and wherein the plurality of illumination segments provide left eye and right eye directional illumination to the corresponding display segments in synchronization with selected left eye and right eye imagery.

3. A segmented illumination system in accordance with claim 2, wherein the illumination system provides left eye directional illumination to one or more of a plurality of viewer left eyes and right eye directional illumination to one or more of a plurality of viewer right eyes in synchronization with selected left eye and right eye imagery.

4. A segmented illumination system in accordance with claim 1, wherein two or more of the plurality of illumination units corresponds to each of the plurality of illumination segments.

5. A segmented illumination system in accordance with claim 4, wherein said two or more illumination units provide illumination to the corresponding illumination segment at the same end of the illumination segment.

6. A segmented illumination system in accordance with claim 4, wherein at least one of the two or more illumination units provides illumination to the corresponding illumination segment at a first end of the illumination segment, and at least another one of the two or more illumination units provides illumination to the corresponding illumination segment at a second, opposing end of the corresponding illumination segment.

7. A segmented illumination system in accordance with claim 1, wherein one or more of the plurality of illumination units corresponds to each of the plurality of illumination segments, and the one or more illumination units provide illumination to each corresponding illumination segment at a first end of the illumination segments, and wherein each illumination segment comprises a corresponding curved second end, opposite each first end.

8. A segmented illumination system in accordance with claim 1, wherein said illumination units are LEDs.

9. A segmented illumination system in accordance with claim 1, wherein said display segments are liquid crystal display segments.

10. An electronic stereoscopic display system having a sequentially scanning display, the display system comprising:

a plurality of liquid crystal display segments for providing left eye and right eye imagery in a sequential scan;

a plurality of directional illumination segments corresponding to the plurality of liquid crystal display segments, the plurality of directional illumination segments arranged contiguously in the direction of the sequential scan;

a plurality of illumination units, one or more of the illumination units corresponding to each of the plurality of directional illumination segments for providing illumination to said corresponding directional illumination segments, the plurality of directional illumination segments thereby directionally illuminating the corresponding plurality of liquid crystal display segments in a first or second direction, wherein the plurality of illumination segments are physically isolated from one another;

wherein said plurality of illumination units provide said illumination to said corresponding directional illumination segments such that the corresponding directional illumination segments illuminate corresponding display segments in synchronization with selected left eye and right eye imagery provided by the corresponding plurality of liquid crystal display segments.

11. A display system in accordance with claim 10, wherein the illumination system provides left eye directional illumination to one or more of a plurality of viewer left eyes and right eye directional illumination to one or more of a plurality of viewer right eyes in synchronization with selected left eye and right eye imagery.

12. A display system in accordance with claim 10, wherein two or more of the plurality of illumination units corresponds to each of the plurality of illumination segments.

13. A display system in accordance with claim 12, wherein said two or more illumination units provide illumination to the corresponding illumination segment at the same end of the illumination segment.

14. A display system in accordance with claim 12, wherein at least one of the two or more illumination units provides illumination to the corresponding illumination segment at a first end of the illumination segment, and at least another one of the two or more illumination units provides illumination to the corresponding illumination segment at a second, opposing end of the corresponding illumination segment.

15. A display system in accordance with claim 10, wherein one or more of the plurality of illumination units corresponds to each of the plurality of illumination segments, and the one or more illumination units provide illumination to each corresponding illumination segment at a first end of the illumination segments, and wherein each illumination segment comprises a corresponding curved second end, opposite each first end.