APPARATUS AND METHODS FOR HOLOGRAPHIC DISPLAY

• US 20140036329A1
• Filed: 01/14/2011
• Published: 02/06/2014
• Est. Priority Date: 01/14/2011
• Status: Active Grant

• Current Assignee: Levent Onural
• Original Assignee: Levent Onural
• Inventors: Kang, Hoonjong, Yaras, Fahri
• Granted Patent: US 9,501,036 B2
• Time in Patent Office: Days
• US Class Current: 359/9
• CPC Class Codes: G03H 1/2202 Reconstruction geometries or arrangements
• CPC Class Codes: G03H 1/2205 using downstream optical component
• CPC Class Codes: G03H 1/2294 Addressing the hologram to an active spatial light modulator
• CPC Class Codes: G03H 1/26 Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
• CPC Class Codes: G03H 2001/0224 Active addressable light modulator, i.e. Spatial Light Modulator [SLM] corresponding details, see subgroups of G03H2225/00
• CPC Class Codes: G03H 2001/2242 Multiple viewing windows
• CPC Class Codes: G03H 2223/24 Reflector; Mirror
• CPC Class Codes: G03H 2225/55 Having optical element registered to each pixel
• CPC Class Codes: G03H 2225/60 Multiple SLMs

Abstract

The present invention relates to a holographic display and more particularly to an apparatus and methods for a curved electro-holographic display. The apparatus mainly comprises; at least one light source for providing lights, at least one axially symmetric mirror for reflecting the fights coming from light source, at least one spatial light modulation system consists of one or more than one spatial light modulators for modulating lights reflecting from the axially symmetric mirror and forming a desired optical reconstruction above the axially symmetric mirror by reflecting the lights which is seen from a viewing zone by the user.

Claims

1. An apparatus for holographic display comprising;

at least one light source for providing a source light beam and characterized by

at least one axially symmetric mirror for reflecting the source light beam,

a spatial light modulation system having one or more than one spatial light modulators for modulating light reflecting from the axially symmetric mirror and forming a desired optical reconstruction above the axially symmetric mirror, wherein the one or more than one spatial light modulators of the spatial light modulation system are in a configuration that has a central axis, and wherein the central axis is substantially collinear with the axis of symmetry of the axially symmetric mirror.

2. The apparatus according to claim 1, wherein the spatial light modulation system is configured in accordance with a holographic fringe pattern configuration, wherein the holographic fringe pattern configuration comprises a plurality of holographic fringe patterns, wherein at least one of the holographic fringe patterns is dynamically modified and wherein each of the plurality of holographic fringe patterns is associated with a corresponding planar spatial light modulator from among the one or more than one planar spatial light modulators of the spatial modulation system.

3. The apparatus according to claim 1, wherein the one or more than one spatial light modulators of the spatial light modulation system form a parabolic surface.

4. The apparatus according to claim 1, wherein the one or more than one spatial light modulators of the spatial light modulation system form a SW layer by tiling along a surface.

5. The apparatus according to claim 4, wherein the one or more than one spatial light modulators of the spatial light modulation system are arranged in a cylindrical configuration.

6. The apparatus according to claim 4, wherein the one or more than one spatial light modulators of the spatial light modulation system are arranged in a partially spherical configuration.

7. The apparatus according to claim 4, wherein the one or more than one spatial light modulators of the spatial light modulation system are arranged in a conical configuration.

8. The apparatus according to claim 4, wherein each of the one or more than one spatial light modulators of the spatial light modulation system comprises a transmissive liquid crystal display panel.

9. The apparatus according to claim 4, wherein each of the one or more than one spatial light modulators of the spatial light modulation system comprises a reflective liquid crystal display panel.

10. The apparatus according to claim 4, wherein each of the one or more than one spatial light modulators of the spatial light modulation system comprises a liquid crystal on silicon panel.

11. The apparatus according to claim 4, wherein each of the one or more than one spatial light modulators of the spatial light modulation system comprises a digital micro-mirror array.

12. The apparatus according to claim 4, wherein at least one of the one or more than one spatial light modulators of the spatial light modulation system comprises a phase-only spatial light modulator.

13. The apparatus according to claim 4, wherein at least one of the one or more than one spatial light modulators of the spatial light modulation system comprises an amplitude-only spatial light modulator.

14. The apparatus according to claim 4, wherein at least one of the one or more than one spatial light modulators of the spatial light modulation system comprises a complex-amplitude spatial light modulator.

15. The apparatus according to claim 4, wherein at least one of the one or more than one spatial light modulators of the spatial light modulation system comprises an optically addressed spatial light modulator.

16. The apparatus according to claim 4, wherein at least one of the one or more than one spatial light modulators of the spatial light modulation system comprises an electrically addressed spatial light modulator.

17. The apparatus according to claim 1, wherein the desired optical reconstruction is formed in a color interlacing manner.

18. The apparatus according to claim 1, wherein the light source is a coherent light source.

19. The apparatus according to claim 1, wherein the light source is an incoherent light source.

20. The apparatus according to claim 18, wherein the light source is a continuous wave laser.

21. The apparatus according to claim 19, wherein the light source is a LED light source with a narrow band-pass filter.

22. The apparatus according to claim 19, wherein the light source is a halogen lamp.

23. The apparatus according to claim 1, wherein the axially symmetric mirror is a partially spherical mirror.

24. The apparatus according to claim 1, wherein the axially symmetric mirror is a cylindrical mirror.

25. The apparatus according to claim 1, wherein the axially symmetric mirror is a conical mirror.

26. The apparatus according to claim 1, further characterized by at least one collimator optical system which comprises a combination of two lenses for collimating the source light beam and at least one pinhole for filtering the undesired high spatial frequency components of the light beam.

27. The apparatus according to claim 1, characterized by a collimator optical system which directs the source light beam substantially parallel to or collinear with the axis of symmetry of the axially symmetric mirror.

28. The apparatus according to claim 1, wherein each of the one or more spatial light modulators of the spatial light modulation system has an active area that covers an entire side of itself.

29. The apparatus according to claim 1, wherein the one or more than one spatial light modulators of the spatial light modulation system are each tilted about a horizontal axis.

30. The apparatus according to claim 4, wherein the apparatus further comprises, in correspondence to each of the one or more than one spatial light modulators of the spatial light modulation system, at least one relay optical system.

31. The apparatus according to claim 30, wherein each of the at least one relay optical systems comprises two lenses for eliminating blind spots caused, for each of the one or more than one spatial light modulators of the spatial light modulation system, by a respective edge of a protective mount of the respective one of the one or more than one spatial light modulators of the spatial modulation system.

32. The apparatus according to claim 26 further comprising, in correspondence to each of the one or more than one spatial light modulators of the spatial light modulation system:

a respective compensation lens for converting a cylindrical wave that is reflected from the at least one axially symmetric mirror to a plane wave so as to compensate for the restricted spatial frequency bandwidth of the cylindrical wave and

at least one beam splitter for reflecting the source light beam that reflects from the at least one axially symmetric mirror onto the respective compensation lens and the corresponding spatial light modulator of the one or more than one spatial light modulators of the spatial light modulation system.

33. The apparatus according to claim 28, wherein the active surface area of the one or more than one spatial light modulators of the spatial light modulation system covers a solid angle that is less than 2π

steradians.

34. An apparatus for holographic display comprising;

at least one light source for providing a source light beam and characterized by

at least one axially symmetric mirror for reflecting the source light beam, a spatial light modulation system having one or more than one spatial light modulators for modulating light reflecting from the axially symmetric mirror and forming a desired optical reconstruction, wherein the one or more than one spatial light modulators of the spatial light modulation system are in a configuration selected from the group comprising a cylindrical, a partially spherical and a conical configuration, wherein the configuration has a central axis, and wherein the central axis is substantially collinear with the axis of symmetry of the axially symmetric mirror.