Projection device and projection method

A projection device comprising:

• a light source configured to emit parallel light;
• a spatial light modulator that has a modulation part that modulates a phase of the parallel light emitted from the light source;
• a liquid crystal lens that includes a liquid crystal region on which modulated light modulated by the spatial light modulator is incident and that projects the modulated light incident on a lens region dynamically formed in the liquid crystal region as projection light;
• and
• a controller including:
• a memory storing instructions;
• and
• a processor connected to the memory and configured to execute the instructions to:
• cause the lens region to be formed at a desired position in the liquid crystal region of the liquid crystal lens;
• set a phase image corresponding to the projection light projected toward a projection target, to the modulation part of the spatial light modulator;
• and
• control the light source to emit the parallel light toward the modulation part to which the phase image is set,
• wherein the light source is configured to switch between modulation schemes of the parallel light to be emitted, and
• wherein the processor is configured to execute the instructions to switch between the modulation schemes of the parallel light to be emitted from the light source in accordance with a use purpose.