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US 11,768,463 B2Granted
Digital hologram display apparatus and displaying method of digital holographic image
AssigneeElectronics and Telecommunications Research Institute
InventorByung Gyu Chae
Life of this patent
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Abstract
Provided are a method of displaying a digital holographic image and a digital hologram display apparatus, the method including generating and converting a digital hologram, recording the digital hologram in a spatial light modulator, radiating coherent parallel light to the spatial light modulator, removing an aliasing noise image, and implementing a reconstructed image reconstructed by the spatial light modulator.
Claims20
A method of displaying a digital holographic image, comprising:
- generating and converting a digital hologram with a numerical aperture having a quantity larger than a sine value of a diffraction angle of pixels of a spatial light modulator;
- recording the digital hologram in the spatial light modulator;
- radiating coherent parallel light to the spatial light modulator;
- removing an aliasing noise image generated due to a periodicity of the pixels of the spatial light modulator, a sampling rate of the spatial light modulator, or both;
- and
- implementing a reconstructed image reconstructed by the spatial light modulator.
3 more elements
A digital hologram display apparatus comprising:
- a digital hologram generation/conversion unit configured to generate and convert a digital hologram;
- a backlight unit configured to generate coherent parallel light;
- a spatial light modulator comprising a plurality of pixels configured to record the digital hologram as an electric signal and reconstruct the digital hologram;
- a noise image removal unit provided on the spatial light modulator and comprising a plurality of subpixels configured to remove an aliasing noise image;
- and
- an output optical system configured to implement a reconstructed image reconstructed by the spatial light modulator,
- wherein the coherent parallel light generated by the backlight unit is radiated to the spatial light modulator,
- wherein the aliasing noise image is due to a periodicity of the plurality of pixels of the spatial light modulator, a sampling rate of the spatial light modulator, or both, and
- wherein the digital hologram has a numerical aperture having a quantity larger than a sine value of a diffraction angle of the pixels of the spatial light modulator.
6 more elements
Dependencies are inferred from the claim text.