Patent EA-002343-B1 (EA)
Title: A system for the production of a dynamic image for display
Inventor: BROWN CARL
IPC: G02F1/01
Filed: 1998-10-15
Abstract: 1. A system for the production of a dynamic image for use in holography comprising: a light source (16); first spatial light modulator means (18) having an associated addressing frame-rate in the path of the light source, wherein further comprises: relay optics means (22) in the path of the light from the first spatial light modulator means (18) for guiding the modulated light therefrom, and; second spatial light modulator means (24) having an associated addressing frame-rate in the path of the guided light from the relay optics means (22) and arranged to produce a real image therefrom to be used in holography, wherein the addressing frame-rate of the first spatial light modulator means (18) is substantially greater than the addressing frame-rate of the second spatial light modulator means (24). 2. A system according to claim 1 wherein the second spatial light modulator means (24) comprises an optically addressable spatial light modulator. 3. A system according to either one of the preceding claims wherein the first spatial light modulator means (18) is arranged to produce a plurality of modulated light sources from the light source to the relay optics means (22). 4. A system according to either claim 1 or claim 2 wherein the first spatial light modulator means (18) comprises a plurality of spatial light modulators. 5. A system according to any one of the preceding claims wherein the first spatial light modulator means (18) is electrically addressable. 6. A system according to any one of the preceding claims wherein the relay optics means (22) guides modulated light from the first spatial light modulator means (18) to the second spatial light modulator means (24) in a predetermined pattern. 7. A system according to any one of the preceding claims wherein the relay optics means (22) modulates the phase of light guided thereby. 8. A system according to any one of the preceding claims wherein the relay optics means (22) comprises lens means. 9. A system according to claim 8 wherein the lens means comprises an array of individual lenses. 10. A system according to any one of the preceding claims wherein the relay optics means (22) comprises a beamsplitter. 11. A system according to any one of the preceding claims wherein the relay optics means includes a shadow-mask. 12. A system according to any one of the preceding claims wherein the modulated light from the first spatial light modulator means (18) is replicated at the second spatial light modulator means (22) by the relay optics means (24). 13. A system according to claim 12 wherein the replication of the modulated light comprises a plurality of images. 14. A system according to either claim 12 or 13 wherein the relay optics means (22) guides the replicated modulated light time-sequentially to predetermined portions of the second spatial light modulator (24). 15. A system according to any one of the preceding claims wherein the number of pixels capable of being displayed on the first spatial light modulator means (18) is less than the number number of pixels capable of being displayed on the second spatial light modulator means (24). 16. A system according to any one of the preceding claims wherein the second spatial light modulator means is a ferroelectric liquid crystal light modulator. 17. A system according to anyone of the preceding claims wherein the light source is an incoherent light source or a plurality of light sources. 18. A method of producing a dynamic image for use in holography comprising: providing a light source (16) and passing light source through or reflected it from a first spatial light modulator means (18) having an associated addressing frame-rate; guiding the modulated light via a relay optics means (22), disposed in the path of the modulated light, to a second spatial light modulator means (24), which second spatial light modulator means (24) has an associated addressing frame-rate substantially less than the associated addressing frame-rate of the first spatial light modulator; and providing a real image or pattern from the second spatial light modulator means (24). 19. A method of producing a dynamic image for use in holography comprising: providing a light source (16) and modulating this light source using a first spatial light modulator means (18) having an associated addressing frame-rate, the method characterized by  guiding the modulated light via a relay optics means (22), disposed in the path of the modulated light, to a second spatial light modulator means (24), which second spatial light modulator means (24) has an associated addressing frame-rate substantially less than the associated addressing frame-rate of the first spatial light modulator; and providing a real image or pattern from the second spatial light modulator means (24). 20. A method according to claim 19 wherein the second spatial light modulator means (24) comprises an optically addressable spatial light modulator. 21. A method according to any one of claims 18 or 20 wherein the first spatial light modulator means (18) is arranged to produce a plurality of modulated light sources from the light source to the relay optics means (22). 22. A method according to any one of claims 19 to 21 wherein the first spatial light modulator means (18) is electrically addressable. 23. A method according to one of claims 19 to 22 wherein the relay optics means (22) guides modulated light from the first spatial light modulator means (18) to the second spatial light modulator means (24) in a predetermined pattern. 24. A method according to any one of claims 19 to 23 wherein the relay optics means (22) comprise lens means. 25. A method according to any one of claims 19 to 24 wherein the relay optics (22) means guides the modulated light time-sequentially from the first spatial light modulator means (18) to predetermined portions of the second spatial light modulator means (24). 26. A method according to any one of claims 19 to 25 wherein the number of pixels capable of being displayed on the first spatial light modulator is less than the number of pixels capable of being displayed on the second spatial light modulator. 27. A method according to any one of claims 19 to 26 wherein the relay optics means produces multiple replications of the pattern shown on the first SLM means onto the second SLM means and where the second SLM means has electrodes patterned to correspond to the replications, and one or more of the electrode segments on the second SLM means is activated in synchronisation with the images shown on the first SLM means.