Vehicular display device
A vehicular display device includes a display that emits, as display light, a display image projected onto a windshield, a transparent cover that blocks an opening of a housing and transmits at least a part of the display light emitted from the display, a plurality of reflecting mirrors, and a quarter wave plate. Using a vibration direction of the display light from the display as a reference vibration direction, the quarter wave plate converts the display light transmitted from the transparent cover toward the reflecting mirror into circularly polarized light vibrating in a direction tilted by 45 degree from the reference vibration direction and converts the circularly polarized light transmitted toward the reflecting mirror from the reflecting mirror into display light vibrating in a direction orthogonal to the reference vibration direction.
1. A vehicular display device comprising:
a display that emits, as display light, a display image projected onto a projected member provided in a vehicle;
a cover member that blocks an opening provided in a housing and transmits the display light emitted from the display;
a first aspherical mirror that is located at a position where an optical path of the display light from the display to the projected member is folded back, and reflects the display light;
a quarter wave plate that is disposed at a position facing the first aspherical mirror on the optical path of the display light, transmits the display light incident from the cover member, and transmits the display light incident from the first aspherical mirror; and
a second aspherical mirror that reflects the display light transmitted through the quarter wave plate toward the projected member disposed on an opposite side with respect to the cover member that is interposed between the second aspherical mirror and the projected member, wherein
the display emits first linearly polarized light vibrating in a reference vibration direction,
the quarter wave plate converts the first linearly polarized light incident from the cover member and transmitted to the first aspherical mirror side into circularly polarized light vibrating in a direction tilted by 45 degree with respect to the reference vibration direction, and converts the circularly polarized light reflected by the first aspherical mirror and transmitted toward the second aspherical mirror into second linearly polarized light vibrating in a direction orthogonal to the reference vibration direction, and
the cover member has a convex curved surface shape protruding toward an inside of the housing, and has a structure to reflect the first linearly polarized light emitted from the display toward the quarter wave plate and transmit the second linearly polarized light from the second aspherical mirror toward the projected member.