Image output panel and head-up display

A head-up display comprising:

• a light source that is configured to emit light from a light emission surface;
• and
• an image output panel that is provided so as to be inclined with respect to the light emission surface at an angle, wherein
• the head-up display is configured to project light that is emitted from the light emission surface and transmitted through the image output panel onto a projection destination member having a light-transmitting property,
• the image output panel includes:
• a first polarization plate that transmits a p-wave when a plate surface on the light emission surface side of the image output panel is regarded as an interface, and blocks light polarized in a direction different from that of the p-wave;
• a second polarization plate that transmits an s-wave when the plate surface is regarded as the interface, and blocks light polarized in a direction different from that of the s-wave;
• a liquid crystal panel that is disposed between the first polarization plate and the second polarization plate and includes a plurality of pixels in which a degree of change in a polarization direction of light entering from the light emission surface side and travelling toward the opposite side opposite to the light emission surface side is individually controllable;
• and
• a retardation plate that changes the polarization direction of light entering from the light emission surface side and travelling toward the opposite side from the polarization direction of the p-wave to the polarization direction of the s-wave or from the polarization direction of the s-wave to the polarization direction of the p-wave, and
• each of the light that enters the liquid crystal panel from the light emission surface side and the light that is transmitted through the image output panel is light transmitted through the plate surface as the p-wave.