Head-up display

A head-up display comprising:

• a housing having an inner space therein and configured to be disposed below a windshield of a vehicle;
• an imaging device accommodated in the inner space and configured to emit a first linearly polarized light in a first direction;
• an inner mirror disposed to be spaced apart from the imaging device in the inner space and configured to reflect the first linearly polarized light emitted from the imaging device in the first direction;
• a polarization film configured to transmit the first linearly polarized light reflected from the inner mirror and reflect a second linearly polarized light in a second direction orthogonal to the first direction;
• and
• a phase delay mirror disposed outside the inner space and configured to phase-convert the first linearly polarized light transmitted through the polarization film after being reflected from the inner mirror into the second linearly polarized light so as to emit the second linearly polarized light to the polarization film,
• wherein the second linearly polarized light phase-converted from the phase delay mirror is reflected to the windshield by the polarization film, and
• wherein the first linearly polarized light reflected from the inner mirror is transmitted through the polarization film to proceed to the windshield.