Patent ID: 11880164
Assignee: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 7:
8. A hologram display device comprising:
a spatial light modulator configured to include a plurality of pixels and to modulate an input light into a diffracted light;
a lens unit configured to emit the diffracted light; and
a viewing window control module configured to provide the emitted diffracted light to a user's viewing region,
wherein the viewing window control module comprises:
a viewing window forming unit having a first reflective optical system that receives the emitted diffracted light and forms a viewing window in the viewing region; and
a viewing angle expanding unit having a second reflective optical system that is arranged in one direction on and integrated with the viewing window forming unit and expands a viewing angle of the viewing window,
wherein the viewing angle expanding unit has a plurality of second reflective optical systems that are sequentially arranged at a predetermined pitch in the one direction on a light receiving surface of the viewing window forming unit,
wherein the second reflective optical system has an arrangement pitch based on a pixel pitch of the spatial light modulator.