Multiview 3D wrist watch

Patent metadata

Field	Value
Publication number	US-9298168-B2
Application number	US-201414308961-A
Country	US
Kind code	B2
Filing date	Jun 19, 2014
Priority date	Jan 31, 2013
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

A multiview 3D wrist watch is disclosed. The wrist watch has clock circuitry to determine a time and a plurality of light sources to generate a plurality of input planar lightbeams. A directional backplane having a plurality of directional pixels scatters the plurality of input planar lightbeams into a plurality of directional lightbeams, each directional lightbeam having a direction and angular spread controlled by characteristics of a directional pixel in the plurality of directional pixels. A shutter layer receives the time from the clock circuitry and modulates the plurality of directional lightbeams to generate a 3D time view.

First claim

What is claimed is:

1. A multiview 3D wrist watch, comprising:
clock circuitry to determine a time;
a plurality of light sources to generate a plurality of input planar lightbeams;
a directional backplane configured to guide the plurality of input planar lightbeams, the directional backplane having a plurality of directional pixels configured to scatter a fraction of the guided input planar lightbeams out of a surface of the directional backplane into a plurality of directional lightbeams corresponding to directions of different views of a three-dimensional (3D) image, each directional lightbeam having a direction and angular spread controlled by characteristics of a directional pixel in the plurality of directional pixels; and
a shutter layer configured to receive the time from the clock circuitry and modulate the plurality of directional lightbeams to generate a 3D time view as the 3D image.

2. The multiview 3D wrist watch of claim 1 , further comprising a spacer layer positioned above the directional backplane.

3. The multiview 3D wrist watch of claim 2 , wherein the shutter layer is positioned above the spacer layer.

4. The multiview 3D wrist watch of claim 1 , wherein the directional backplane comprises a slab of transparent material that is substantially planar, the plurality of input planar lightbeams being configured to propagate within a plane of the substantially planar transparent material slab.

5. The multiview 3D wrist watch of claim 1 , wherein each directional pixel in the plurality of directional pixels comprises a patterned grating, the patterned grating comprising a plurality of substantially parallel grooves.

6. The multiview 3D wrist watch of claim 5 , wherein the characteristics of a directional pixel comprise a grating length, a grating width, a grating orientation, a grating pitch, and a grating duty cycle of the patterned grating.

7. The multiview 3D wrist watch of claim 6 , wherein the grating pitch and the grating orientation of the patterned grating control the direction of a directional lightbeam scattered by the directional pixel.

8. The multiview 3D wrist watch of claim 6 , wherein the grating length and the grating width of the patterned grating control the angular spread of a directional lightbeam scattered by the directional pixel.

9. The multiview 3D wrist watch of claim 1 , wherein the shutter layer comprises a plurality of modulators.

10. The multiview 3D wrist watch of claim 1 , wherein the directional backplane comprises a polygonal slab of transparent material, the polygonal slab being one of a triangular slab and a hexagonal slab.

11. The multiview 3D wrist watch of claim 1 , wherein the directional backplane comprises a circular slab of transparent material.

12. The multiview 3D wrist watch of claim 1 , wherein the plurality of directional pixels comprises a plurality of polygonal directional pixels.

13. The multiview 3D wrist watch of claim 1 , wherein the plurality of directional pixels comprises a plurality of circular directional pixels.

14. A method of generating a 3D time view in a multiview 3D wrist watch, the method comprising:
determining a time to be displayed by the wrist watch;
guiding a plurality of input planar lightbeams from a plurality of light sources in the wrist watch within a directional backplane comprising a slab of transparent material;
generating a plurality of directional lightbeams by scattering a fraction of the guided input planar lightbeams out of the transparent material slab using a plurality of directional pixels in the directional backplane, the directional pixels comprising patterned gratings to produce directional lightbeams having a predetermined angle and angular spread corresponding to different predetermined views of a 3D image; and
modulating the plurality of directional lightbeams using a shutter layer controlled according to the determined time to provide a 3D time view of the determined time as the 3D image using the modulated directional lightbeams.

15. The method of claim 14 , wherein each directional lightbeam has a direction and an angular spread controlled by characteristics of a patterned grating of a directional pixel in a plurality of directional pixels in the directional backplane.

16. A multiview 3D wrist watch comprising:
clock circuitry to determine a time;
a plurality of light sources to generate input planar lightbeams;
a directional backplane comprising a slab of transparent material configured to guide the input planar lightbeams;
a plurality of directional pixels in the directional backplane to scatter a fraction of the input planar lightbeams into a plurality of directional lightbeams, each directional lightbeam having a direction and an angular spread controlled by a characteristic of a directional pixel of the directional pixel plurality; and
a shutter layer to receive the time from the clock circuitry and to modulate the plurality of directional lightbeams to provide a 3D time view,
wherein each of the directional pixels comprises a patterned grating, different ones of the modulated directional lightbeams having controlled directions and angular spreads to provide different predetermined views of the 3D time view.

17. The multiview 3D wrist watch of claim 16 , wherein the patterned grating comprises a plurality of substantially parallel grooves.

18. The multiview 3D wrist watch of claim 16 , wherein the characteristic of a directional pixel comprises one or more of a grating length, a grating width, a grating orientation, a grating pitch, and a grating duty cycle.

19. The multiview 3D wrist watch of claim 16 , wherein the characteristic comprises a grating pitch and a grating direction, and wherein the grating pitch and the grating direction are configured to control the direction of a directional light beam.

20. The multiview 3D wrist watch of claim 16 , wherein the patterned grating of each directional pixel is configured to produce a single directional lightbeam.

Assignees

• Leia Inc

Inventors

• Taff Brian
• Fattal David A
• Beausoleil Raymond G

Classifications

• G04G9/0041 Primary

  Illumination devices · CPC title

• G03H1/2294

  Addressing the hologram to an active spatial light modulator · CPC title

• G02B5/1842

  Gratings for image generation (G02B5/1847 takes precedence) · CPC title

• G02B30/27

  involving lenticular arrays · CPC title

• G02B5/1819

  Plural gratings positioned on the same surface, e.g. array of gratings (plural diffractive elements positioned sequentially along the optical path G02B27/4272) · CPC title