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    BACKLIGHT UNIT AND HOLOGRAPHIC DISPLAY APPARATUS INCLUDING THE SAME
    2.
    发明申请
    BACKLIGHT UNIT AND HOLOGRAPHIC DISPLAY APPARATUS INCLUDING THE SAME 有权

    公开(公告)号：US20220196900A1

    公开(公告)日：2022-06-23

    申请号：US17693974

    申请日：2022-03-14

    Applicant: SAMSUNG ELECTRONICS CO., LTD.

    Inventor： Chilsung CHOI ,  Hoon Song ,  Jungkwuen An ,  Hongseok Lee

    IPC: F21V8/00 ,  G03H1/08 ,  G03H1/22 ,  G02B30/25

    Abstract: A backlight unit may include: a light source providing coherent light; a light guide plate having a light entrance surface on which light from the light source is incident and a light exit surface through which the light is output; a plurality of diffraction gratings (for example, a first input grating, a second input grating, and a third input grating) that are arranged in different regions of the light guide plate to sequentially diffract the light from the light source such that that the beam width of the light may increase as the light propagates in the light guide plate; and a diffraction grating (for example, an output grating) that diffracts and outputs the light having an increased beam width in a direction toward the outside of the light guide plate.

    BACK LIGHT UNIT FOR HOLOGRAPHIC DISPLAY
    4.
    发明申请
    BACK LIGHT UNIT FOR HOLOGRAPHIC DISPLAY 审中-公开

    公开(公告)号：US20170090089A1

    公开(公告)日：2017-03-30

    申请号：US15251475

    申请日：2016-08-30

    Applicant: SAMSUNG ELECTRONICS CO., LTD.

    Inventor： Sunil KIM ,  Juwon SEO ,  Wontaek SEO ,  Chilsung CHOI

    IPC: F21V8/00

    CPC classification number: G02B6/005 ,  G02B6/00 ,  G02B6/0055 ,  G02B6/0066 ,  G02B27/01

    Abstract: Provided is a back light unit (BLU) for holographic display. The BLU includes a first diffraction grating attached to a waveguide, a second diffraction grating that supplies light to the first diffraction grating, a light source that supplies light to the second diffraction grating, and a light reflection element that reflects light towards the first diffraction grating. The back light unit may further include a lens that is disposed in front of the waveguide. The light reflection element may be disposed parallel to a rear surface of the waveguide. The light reflection element may be inclined with respect to the rear surface of the waveguide. The light reflection element may be a mirror or a prism array.

    HOLOGRAPHIC DISPLAY DEVICE HAVING REDUCED CHROMATIC ABERRATION
    5.
    发明申请
    HOLOGRAPHIC DISPLAY DEVICE HAVING REDUCED CHROMATIC ABERRATION 有权

    公开(公告)号：US20210080716A1

    公开(公告)日：2021-03-18

    申请号：US17107290

    申请日：2020-11-30

    Applicant: SAMSUNG ELECTRONICS CO., LTD.

    Inventor： Hoon SONG ,  Hongseok LEE ,  Young KIM ,  Jungkwuen AN ,  Kanghee WON ,  Chilsung CHOI

    IPC: G02B27/00 ,  G03H1/22

    Abstract: A holographic display device includes a light source configured to emit light, the light including first light of a first wavelength, second light of a second wavelength, and third light of a third wavelength; a spatial light modulator configured to form a holographic pattern to modulate the light emitted from the light source and to produce a holographic image; and a focusing optical system configured to focus the holographic image. The focusing optical system includes a fixed-focus optical system having a fixed focal length, and a variable focus optical system having a focal length that is changed by electrical control. The fixed-focus optical system is configured to focus the first light of the first wavelength, the second light of the second wavelength, and the third light of the third wavelength on different positions, respectively, on an optical axis to cancel a chromatic aberration by the variable focus optical system.

    HOLOGRAPHIC DISPLAY APPARATUS
    10.
    发明申请
    HOLOGRAPHIC DISPLAY APPARATUS 有权

    公开(公告)号：US20210373493A1

    公开(公告)日：2021-12-02

    申请号：US17165548

    申请日：2021-02-02

    Applicant: SAMSUNG ELECTRONICS CO., LTD.

    Inventor： Hoon SONG ,  Dukho LEE ,  Jong-Young HONG ,  Hongseok LEE ,  Chilsung CHOI

    IPC: G03H1/22 ,  G06T7/50

    Abstract: Provided is a holographic display apparatus including: a spatial light modulator that modulates a wavefront of a reference beam to form a hologram image; an optical element arranged to change a position of a viewing window of the hologram image off-axis by a first angle; and an image processor that generates hologram data according to the position of the viewing window of the hologram image and a hologram image to be reproduced, and provides the hologram data to the spatial light modulator. The hologram image formed by the spatial light modulator is viewable from a side of the spatial light modulator.

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