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.
Claims20
An aperture enlargement film comprising:
- a light guide layer, and
- a grating layer disposed on an upper surface of the light guide layer,
- wherein the light guide layer and the grating layer are configured to transmit a 0th order diffracted light beam and a 1st order diffracted light beam among incident light beams,
- wherein the grating layer is configured to transmit the 0th order diffracted light beam of a light beam vertically incident on the lower surface of the 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 grating layer from the light guide layer at an angle to propagate obliquely in the light guide layer,
- wherein the grating layer transmits 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.
An aperture enlargement film comprising:
- a light guide layer;
- a first grating layer disposed on an upper surface of the light guide layer;
- and
- a second grating layer disposed on an lower surface of the light guide layer,
- wherein the second grating layer is configured to transmit a light beam incident on a lower surface of the second grating layer,
- wherein the first grating layer is configured to transmit a 0th order diffracted light beam in a direction perpendicular to an upper surface of the first grating layer and obliquely reflect a 1st order diffracted light beam toward the light guide layer,
- wherein the second grating layer is further configured to reflect a portion of the 1st order diffracted light beam incident on an upper surface of the second grating layer in a direction perpendicular to the upper surface of the second grating layer,
- wherein the first grating layer is further configured to transmit the portion of the 1st order diffracted light beam from the second 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.
Dependencies are inferred from the claim text.