3D Light Field Displays and Methods with Improved Viewing Angle, Depth and Resolution

• US 20140347361A1
• Filed: 08/05/2014
• Published: 11/27/2014
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Ostendo Technologies Inc.
• Original Assignee: Ostendo Technologies Inc.
• Inventors: El-Ghoroury, Hussein S., Alpaslan, Zahir Y.
• Granted Patent: US 10,297,071 B2
• Time in Patent Office: Days
• US Class Current: 345/426
• CPC Class Codes: G02B 30/10 using integral imaging methods
• CPC Class Codes: G06T 15/50 Lighting effects
• CPC Class Codes: H04N 13/307 using fly-eye lenses, e.g. arrangements of circular lenses

Abstract

3D light field display methods and apparatus with improved viewing angle, depth and resolution are introduced. The methods can be used to create a high quality 3D light field display of any size from smaller than a postage stamp to larger than a three story building.

Claims

1. A light field display system, comprising:

an emissive imager comprising a multiplicity of emissive multi-color pixels,

a variable focal length lens assembly disposed to receive light emission from the emissive imager that passes through the micro patterned screen,

a rotational modulation system for rotating the emissive imager through limited angles, and

an image processing and control system coupled to execute image rendering algorithms and control the emissive imager, the variable focal length lens assembly and the rotation modulation system,

whereby the light field display system is capable of creating wide viewing angle, high resolution, large depth light field images.

2. The light field display system of claim 1 wherein the emissive imager comprises a solid state emissive imager.

3. The light field display system of claim 1, further comprising a micro patterned screen disposed adjacent an emitting surface of the emissive imager to directionally modulate the light emitted from the emissive multi-color pixels of the emissive imager before the light is coupled into the variable focal length lens assembly.

4. The light field display system of claim 3 wherein the micro patterned screen forms an interface between emissive imager and the variable focal length lens assembly in which the micro patterned screen directionally modulates the light emitted from the multiplicity of emissive multi-color pixels in a specific direction depending on the respective spatial position of the respective pixel.

5. The light field display system of claim 4 wherein the directional modulation of the micro patterned screen is realized using a multiplicity of micro-scale optical facets that are designed to refract the light emitted from the multiplicity of emissive multi-color pixels in a specific direction depending on the respective spatial position of the pixel.

6. The light field display system of claim 1 or claim 3 wherein the variable focal length lens assembly is controlled electronically through hardware and associated embedded software algorithms.

7. The light field display system of claim 6 wherein the variable focal length lens assembly provides a depth modulation capability by changing at least one lens surface curvature or by changing at least one lens index of refraction.

8. The light field display system of claim 1 or claim 3 wherein the rotational modulation system is configured to controllably rotate the emissive imager in two axes that are perpendicular to each other.

9. The light field display system of claim 8 wherein the rotational modulation system is configured to provide directional modulation of the light field images created by the emissive imager, the micro patterned screen and the variable focal length lens assembly.

10. The light field display system of claim 8 wherein rotational modulation system is configured to act as a lens with no aberrations, a very large aperture and wide field of view.

11. The light field display system of claim 3 wherein the micro patterned screen is further configured to create collimated, converging or diverging light beams using the light emitted from the emissive multi-color pixels.

12. The light field display system of claim 1 or claim 3 further adapted to create both 2D images and 3D images.

13. The light field display system of claim 1 or claim 3 wherein the variable focal length lens assembly is configured to change its focal length at a rate that would not be perceived by the human visual system to place modulated images at different depth locations at a rate not perceived by the human visual system.

14. The light field display system of claim 10 wherein the variable focal length lens assembly is configured to change its focal length at a rate of at least 60 Hz.

15. The light field display system of claim 1 or claim 3 wherein the variable focal length lens assembly is further configured to modulate 2D or 3D images generated by the emissive imager and the micro patterned screen in a direction perpendicular to a plane of the emissive imager.

16. The light field display system of claim 1 or claim 3 wherein the variable focal length lens assembly is programmed to arrange 2D and 3D images back to back, in overlapped, edge matched and non-matched configurations.

17. The light field display system of claim 1 or claim 3 further comprising a light field rendering adapted to feed the light field display system with image data to create 2D and 3D images.

18. The light field display system of claim 17 further configured to control the variable focal length lens assembly.

19. The light field display system of claim 17 further comprising separating the modulated images by 0.6 diopters to utilize human visual system'"'"'s depth blending ability.

20. The light field display system of claim 17 further comprising a light field rendering adapted to feed the light field display system with image data to create 2D and 3D images, and wherein real 3D, virtual 3D and focused 3D images are created by rendering input images to the emissive imager and by controlling the distance of micro patterned screen from the emissive imager.

21. The light field display system of claim 17 configured for compressed rendering and display matched compression to compress the image data.

22. The light field display system of claim 3 wherein the micro patterned screen is configured to move in small increments parallel to the emitting surface of the emissive surface to increase the number of modulated light beams.

23. The light field display system of claim 1 or claim 3 wherein the rotational modulation system is further configured either to move the emissive imager alone, move the emissive imager and micro patterned screen together, or move imager micro patterned screen and variable focal length lens assembly together, and wherein the rotational modulation system is further configured to move imager alone, to move imager and micro patterned screen together, or to move imager micro patterned screen and variable focal length lens assembly together.

24. The light field display system of claim 23 wherein the rotational modulation system is configured to controllably rotate the emissive imager in two axes that are perpendicular to each other.

25. The light field display system of claim 1 or claim 3 wherein the light field display system is configured to receive as image data, real 3D, virtual 3D and focused 3D image data.

26. The light field display system of claim 1 or claim 3 wherein the variable focal length lens assembly is controlled to present images at different locations in space within a frame time.

27. The light field display system of claim 1 or claim 3 wherein the rotational system is controlled to create a bigger 3D image volume.

28. The light field display system of claim 1 or claim 3 wherein multiple light field display systems are tiled to create a larger 3D volume and a larger 2D display.

29. The light field display system of claim 1 or claim 3 configured to create images that enable depth blending by a human visual system.

30. The light field display system of claim 1 or claim 3 configured to separate depth blendable images by predetermined distances.