Recherche dans les collections de brevets nationales et internationales
Une partie du contenu de cette demande n'est pas disponible pour le moment.
Si cette situation persiste, contactez-nous auObservations et contact
1. (WO2008049909) DISPOSITIF D'AFFICHAGE HOLOGRAPHIQUE COMPACT
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS

1. Holographic display device comprising a first EASLM and a second EASLM, the pair permitting independent modification of phase and amplitude, in which holographic reconstruction is visible through one or more virtual observer windows.

2. The holographic display device of Claim 1 in which holographic reconstruction is visible through one or two virtual observer windows.

3. The holographic display device of any previous Claim in which the display is illuminated with a backlight and micro-lens array.

4. The holographic display device of any previous Claim in which a light source is light emitting diodes.

5. The holographic display device of any previous Claim in which one EASLM modifies phase, and the other EASLM modifies amplitude.

6. The holographic display device of any of Claims 1 to 4 in which one EASLM modifies a combination of phase and amplitude, and the other EASLM modifies a different combination of phase and amplitude.

7. The holographic display device of any previous Claim in which there are no intermediary optics between the EASLMs.

8. The holographic display device of any previous Claim in which the EASLMs form adjacent layers with a small or minimal separation.

9. The holographic display device of any of Claims 1 to 7 in which the EASLMs are in fixed, direct or indirect physical attachment.

10. The holographic display device of any previous Claim in which a light source is in fixed, direct or indirect physical attachment to a EASLM.

11. The holographic display device of any previous Claim in which the EASLMs have aligned pixels with respect to the virtual observer windows.

12. The holographic display device of any previous Claim in which the diffraction of the light from the first EASLM to the second EASLM is in the Fresnel diffraction regime, but excluding the Fraunhofer diffraction regime.

13. The holographic display device of any previous Claim in which greater than 90% of the intensity transmitted by each pixel of the first EASLM is incident on the corresponding pixel of the second EASLM, considered in a two dimensional cross-section.

14. The holographic display device of any previous Claim in which an isolation layer separates the EASLMs to minimise the electromagnetic fields from one EASLM adversely affecting the performance of the neighbouring EASLM.

15. The holographic display device of Claims 1 to 6 in which a lens array is placed between the EASLMs to minimise cross-talk.

16. The holographic display device of Claims 1 to 11 in which the aperture of pixels in the first EASLM is reduced to minimise cross-talk.

17. The holographic display device of Claims 1 to 6 in which a fibre-optic faceplate sits between the EASLMs to minimise cross-talk.

18. The holographic display device of any preceding Claim in which virtual observer windows can be tiled using spatial or time multiplexing.

19. The holographic display device of any preceding Claim in which the display is operable to time sequentially re-encode a hologram on a hologram-bearing medium for the left and then the right eye of an observer.

20. The holographic display device of any preceding Claim in which the display generates a 2D image that is in focus on a screen independent of the distance of the screen from the device in the optical far field without the need for any projection lenses.

21. The holographic display device of any preceding Claim in which a holographic image is sent to each eye of an observer using a beamsplitter.

22. The holographic display device of any preceding Claim in which the EASLMs are positioned within 30 mm of a light source and housed within a portable casing.

23. The holographic display device of any preceding Claim in which a beam steering element is present for tracking VOWs, the beam steering element consisting of liquid crystal domains inside an isotropic host material, where the interfaces between the domains and the matrix are prism-shaped, or the shape of sections of a sphere, or the shape of sections of a cylinder, and the orientation of the liquid crystals are controlled using externally applied electric fields so as to vary the local refractive or diffractive properties of the beam steering element.

24. The holographic display device of any preceding Claim in which the EASLMs, a light source and a lens array aligned with the light source, are all housed within a portable casing and in which the light source is magnified between 10 and 60 times by the lens array.

25. A method of generating a holographic reconstruction comprising the step of using a holographic display device as claimed in any of Claims 1 to 24.