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US 11,796,960 B2Granted
Holographic display apparatus for providing expanded viewing window
AssigneesSamsung Electronics Co., Ltd., Korea University Research and Business Foundation, Sejong Campus
InventorsYunhee Kim, Hwi Kim, Hoon Song, Soobin Kim, Hongseok Lee
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Abstract
Provided is a holographic display apparatus capable of providing an expanded viewing window when reproducing a holographic image via an off-axis technique. The holographic display apparatus includes a spatial light modulator comprising a plurality of pixels arranged two-dimensionally; and an aperture enlargement film configured to enlarge a beam diameter of a light beam coming from each of the plurality of pixels of the spatial light modulator. The beam diameter of each light beam enlarged by the aperture enlargement film may be greater than the width of an aperture of each pixel of the spatial light modulator.
Claims16
A holographic display apparatus comprising:
- a spatial light modulator comprising a plurality of pixels disposed two-dimensionally;
- and
- an aperture enlargement film configured to enlarge a beam diameter of a light beam transmitted from each of the plurality of pixels of the spatial light modulator,
- wherein the aperture enlargement film comprises a light guide layer disposed to face a light exiting surface of the spatial light modulator and an one grating layer disposed on an upper surface of the light guide layer, and
- wherein the light guide layer and the one grating layer are configured to transmit a 0th order diffracted light beam and a 1st order diffracted light beam among incident light beams from the spatial light modulator,
- wherein the one grating layer is configured to transmit the 0th order diffracted light beam of a light beam vertically incident on the lower surface of the one grating layer from the light guide layer in a direction perpendicular to an upper surface of the one grating layer, and is configured to reflect the 1st order diffracted light beam of the light beam incident on the lower surface of the one grating layer from the light guide layer at an angle to propagate obliquely in the light guide layer,
- wherein the one grating layer transmit a portion of the 1st order diffracted light beam that is reflected by a lower surface of the light guide layer and obliquely incident on the one grating layer in the direction perpendicular to the upper surface of the one grating layer, and
- wherein a boundary of the transmitted 1st order diffracted light beam coincides with a boundary of the transmitted 0th order diffracted light beam or the transmitted 1st order diffracted light beam overlaps with the transmitted 0th order diffracted light beam based on a thickness of the light guide layer, and
- wherein an intensity of the transmitted 0th order diffracted light beam is greater than the intensity of the transmitted 1st order diffracted light beam.
6 more elements
A holographic display apparatus comprising:
- a spatial light modulator comprising a plurality of pixels disposed two-dimensionally, the plurality of pixels comprising a plurality of apertures, respectively;
- and
- an aperture enlargement film configured to enlarge a beam diameter of a light beam transmitted from each of the plurality of pixels of the spatial light modulator,
- wherein a beam diameter of the enlarged light beam is greater than a width of each of the plurality of apertures,
- wherein the aperture enlargement film comprises a light guide layer disposed to face a light exiting surface of the spatial light modulator and an one grating layer disposed on an upper surface of the light guide layer, and
- wherein the light guide layer and the one grating layer are configured to transmit a 0th order diffracted light beam and a 1st order diffracted light beam among incident light beams from the spatial light modulator,
- wherein the one grating layer is configured to transmit the 0th order diffracted light beam of a light beam vertically incident on the lower surface of the one grating layer from the light guide layer in a direction perpendicular to an upper surface of the one grating layer, and is configured to reflect the 1 st order diffracted light beam of the light beam incident on the lower surface of the one grating layer from the light guide layer at an angle to propagate obliquely in the light guide layer,
- wherein the one grating layer transmit a portion of the 1st order diffracted light beam that is reflected by a lower surface of the light guide layer and obliquely incident on the one grating layer in the direction perpendicular to the upper surface of the one grating layer,
- wherein a boundary of the transmitted 1st order diffracted light beam coincides with a boundary of the transmitted 0th order diffracted light beam or the transmitted 1st order diffracted light beam overlaps with the transmitted 0th order diffracted light beam based on a thickness of the light guide layer, and
- wherein an intensity of the transmitted 0th order diffracted light beam is greater than the intensity of the transmitted 1st order diffracted light beam.
7 more elements
Dependencies are inferred from the claim text.