Hologram reproducing apparatus and method thereof
A hologram reproducing apparatus is provided that includes a display configured to emit a write beam corresponding to a hologram pattern, a spatial light modulator (SLM) configured to write the hologram pattern according to the write beam and modulate the reproduction beam into a plurality of diffraction beams corresponding to the hologram pattern if a reproduction beam is incident, a light guide plate disposed in a front surface of the SLM, and configured to guide the reproduction beam toward the SLM, a filter configured to filter the plurality of diffraction beams, a lens configured to focus the plurality of diffraction beams filtered through the filter, and a plurality of optical fibers arranged in order to dispose at least one optical fiber to correspond to each of a plurality of pixels included in the display, and configured to transmit the write beam to the SLM.
1. A hologram reproducing apparatus, wherein a front of the hologram reproducing apparatus is where a hologram appears, comprising:
a display configured to emit a write beam corresponding to a hologram pattern;
a reproduction beam provider configured to emit a reproduction beam;
a spatial light modulator (SLM) disposed in front of the display, and configured to:
write the hologram pattern according to the write beam emitted from the display, and
modulate the reproduction beam into a plurality of diffraction beams corresponding to the hologram pattern if the reproduction beam is incident;
a light guide plate disposed in front of the SLM, and configured to guide the reproduction beam toward the SLM;
a filter disposed in front of the light guide plate, and configured to filter the plurality of diffraction beams;
a lens configured to focus the plurality of diffraction beams filtered through the filter; and
a plurality of optical fibers arranged to dispose at least one optical fiber to correspond to each of a plurality of pixels included in the display, and configured to transmit the write beam to the SLM,
wherein the plurality of optical fibers is implemented as a tapered fiber face late.
2. The hologram reproducing apparatus as claimed in claim 1 ,
wherein the display comprises a display panel configured to display the hologram pattern, and
wherein the plurality of optical fibers are arranged at a front surface of the display panel facing the SLM.
3. The hologram reproducing apparatus as claimed in claim 2 ,
wherein the display panel comprises a plurality of display modules.
4. The hologram reproducing apparatus as claimed in claim 1 ,
wherein SLM comprises:
a photosensitive layer configured to write the hologram pattern according to the write beam,
a block filter disposed at a front surface of the photosensitive layer, and configured to block the write beam, and
a liquid crystal display (LCD) panel disposed on a front surface of the block filter to modulate an incident reproduction beam into a plurality of diffraction beams corresponding to the hologram pattern, and
wherein the plurality of optical fibers are arranged at a rear surface of the photosensitive layer facing the display.
5. The hologram reproducing apparatus as claimed in claim 1 ,
wherein the light guide plate comprises:
an expander configured to collimate the reproduction beam to make the reproduction beam uniformly incident on a front surface of the SLM; and
an in-coupling element configured to allow an incidence angle of the reproduction beam incident on the expander to fall within a predetermined angle range, and
wherein the in-coupling element is implemented as a Bragg grating element or a prism.
6. The hologram reproducing apparatus as claimed in claim 1 ,
wherein the light guide plate comprises:
an expander and an out-coupling element, wherein the light guide plate is configured to collimate the reproduction beam to make the reproduction beam uniformly incident on front of the SLM, and
the out-coupling element disposed at a rear surface of the expander to refract the reproduction beam incident on the expander at a predetermined angle and emit the reproduction beam to an outside of the expander, and
wherein the out-coupling element is a Bragg grating element.
7. The hologram reproducing apparatus as claimed in claim 6 , wherein the out-coupling element refracts and emits the reproduction beam incident on the expander at the predetermined angle based on an equation,
θ=Arcsin( nλ/ 2 d )
wherein, n denotes a refractive index of the Bragg grating element, λ denotes a wavelength of the reproduction beam, and d denotes a lattice separation distance in the Bragg grating elements.
8. The hologram reproducing apparatus as claimed in claim 1 ,
wherein the filter comprises a Bragg grating filter, and
wherein, if the plurality of diffraction beams are incident, the Bragg grating filter allows a diffraction beam incident within a predetermined angle range to pass through based on a zero order diffraction beam among the plurality of diffraction beams.
9. The hologram reproducing apparatus as claimed in claim 8 , wherein the filter further comprises a louver film disposed at a front surface of the Bragg grating filter to secondarily filter the diffraction beam primarily filtered through the Bragg grating filter.
10. The hologram reproducing apparatus as claimed in claim 1 , wherein the display is a self-luminous display that emits the write beam corresponding to the hologram pattern.
11. The hologram reproducing apparatus as claimed in claim 1 , wherein the light guide plate is implemented as a Bragg grating element to refract the reproduction beam at a predetermined angle and emit the reproduction beam toward the SLM.