Patent ID: 8390533

Claim:
A beam-scan display apparatus that displays an image by scanning a beam on a retina of a user, said beam-scan display apparatus comprising: a case for housing (i) a light source which emits a beam for drawing each pixel of a plurality of pixels constituting the image, and (ii) a scan unit configured to two-dimensionally scan the beam emitted from said light source; and a contact lens including a deflection unit configured to deflect, toward the retina of an eye of the user wearing said case, the beam scanned by said scan unit, said contact lens being separate from said case, wherein said deflection unit is a hologram formed on a surface of said contact lens, wherein said hologram includes: a first interference pattern for deflecting, toward the retina of the user, a beam incident from a first direction; and a second interference pattern for deflecting, toward the retina of the user, a beam incident from a second direction different from the first direction, wherein an optical power of said first interference pattern and an optical power of said second interference pattern are equal, and wherein a direction in which the beam is deflected by said first interference pattern and a direction in which the beam is deflected by said second interference pattern are different.