Light source unit and image display device

A light source unit comprising:

• a display device configured to emit light having a substantially Lambertian light distribution, the display device comprising a pixel column, the pixel column comprising a plurality of pixels arranged along a first direction;
• and
• an imaging optical system comprising:
• a bending part comprising a movable optical system on which light emitted from the display device is incident, the movable optical system being movable around an axis parallel to the first direction, the movable optical system emitting light at an angle corresponding to a movement state, and
• a direction modifying part comprising an output element on which light is incident via the movable optical system, light emitted from the output element forming a first image, wherein:
• the imaging optical system is substantially telecentric at a first image side,
• the bending part is configured to bend chief rays of light emitted at different angles from the movable optical system so that the chief rays are substantially parallel to each other before and after the first image, and
• the direction modifying part is configured to modify a travel direction of the chief rays so that the chief rays traveling via the bending part are directed toward a formation position of the first image.