Light source unit and image display device

A light source unit comprising:

• a first display device configured to display a first picture;
• a second display device configured to display a second picture;
• a first polarizing plate configured to convert light emitted from the first display device into first polarized light having a first polarization direction;
• a second polarizing plate configured to convert light emitted from the second display device into second polarized light having a second polarization direction different from the first polarization direction;
• a reflective polarizing plate configured to transmit the first polarized light and reflect the second polarized light;
• a first reflective member that comprises a first concave surface, and is configured to reflect, from the first concave surface, the first polarized light transmitted through the reflective polarizing plate toward the reflective polarizing plate and project a first image corresponding to the first picture on a projection part, thereby allowing an image visually recognizable by a viewer to be displayed beyond the projection part when viewed by the viewer;
• a first wave plate disposed between the reflective polarizing plate and the first reflective member;
• a second reflective member that comprises a second concave surface, and is configured to reflect, from the second concave surface, the second polarized light reflected by the reflective polarizing plate toward the reflective polarizing plate and project a second image corresponding to the second picture on the projection part, thereby allowing an image visually recognizable by the viewer to be displayed beyond the projection part when viewed by the viewer;
• and
• a second wave plate disposed between the reflective polarizing plate and the second reflective member, wherein:
• (i) a first optical path length of the light emitted from the first display device from the first display device to the first reflective member is longer than a second optical path length of the light emitted from the second display device from the second display device to the second reflective member, and a curvature of the first concave surface is larger than a curvature of the second concave surface, or (ii) the first optical path length is shorter than the second optical path length and the curvature of the first concave surface is smaller than the curvature of the second concave surface.