Head-up display

A head-up display comprising:

• a housing formed with an inner space inside and disposed below a windshield;
• an imaging device accommodated in the inner space and emitting a first linearly polarized light polarized in a first direction;
• a polarization mirror having a transmission area through which the first linearly polarized light is transmitted and a polarization reflection area through which a second linearly polarized light polarized in a second direction perpendicular to the first direction is reflected;
• and
• a phase retardation mirror spaced apart from the polarization mirror and phase-converting the first linearly polarized light transmitted through the transmission area into the second linearly polarized light,
• wherein at least a portion of the polarization mirror is located between the imaging device and the phase retardation mirror,
• wherein a front first surface and a second surface of the polarization mirror are not parallel, and
• wherein a first end thickness of the polarization mirror is different from a second end thickness of the polarization mirror.