Vehicle display device and vehicle display system

A vehicle display device comprising:

• a display configured to display a video;
• a first concave mirror having a reflecting surface formed in a concave shape configured to reflect the video displayed in the display;
• and
• a second concave mirror having a reflecting surface formed in a concave shape configured to reflect the video reflected on the first concave mirror, wherein
• a display surface of the display is positioned within a composite focal length of the first concave mirror and the second concave mirror;
• a distance from eye point of occupant of vehicle to a reflecting image formed by the second concave mirror is optically extended such that it becomes longer than a distance from the eye point of the occupant to a display surface of the display;
• and
• R1 and R2 satisfy 1.1<R2/R1<2 wherein R1 represents a curvature radius of the reflecting surface of the first concave mirror and R2 represents a curvature radius of the reflecting surface of the second concave mirror;
• and
• at least one of conditions:
• i1 and i2 satisfy 30°≤i1+i2≤70° wherein i1 represents an incidence angle of central ray from the display onto the first concave mirror and i2 represents an incidence angle of central ray from the first concave mirror onto the second concave mirror;
• R1 satisfies 300 mm≤R1≤=600 mm;
• and
• Yv and Yp satisfy 1<Yv/Yp<10 wherein Yv represents a magnitude in a vertical direction of the video that is visually confirmed by the occupant and Yp represents a magnitude in a height direction of the video, corresponding to the vertical direction of the virtual image displayed on the display surface;
• is satisfied.