Holographic display apparatus and holographic display method

A holographic display apparatus comprising:

• a spatial light modulator configured to generate hologram patterns to modulate light;
• and
• an illuminator configured to emit the light to the spatial light modulator,
• wherein the spatial light modulator is configured to generate, from among the hologram patterns, a first hologram pattern and a second hologram pattern according to control operations of the holographic display apparatus, the first hologram pattern and the second hologram pattern being configured to form a first hologram image and a second hologram image having different viewpoints, and
• wherein the holographic display apparatus is configured to set a first phase modulation value of the first hologram pattern and a second phase modulation value of the second hologram pattern to be different from each other such that hologram images having different viewpoints formed by the first hologram pattern and the second hologram pattern are formed on different spatial locations, and
• wherein the holographic display apparatus is configured to control the spatial light modulator to alternately scan the first hologram pattern and the second hologram pattern in a progressive scanning way in order to alternately form the first hologram image and the second hologram image in a time division way.