Display device for vehicle

A display device for a vehicle, the display device comprising:

• an image display unit that projects a display image on a projected member of a vehicle, and causes a driver of the vehicle to visually recognize a virtual image corresponding to the display image projected on the projected member;
• an imaging unit that acquires a face image including a face of the driver;
• a pupil detection unit that detects a pupil of the driver based on the face image acquired by the imaging unit;
• a moving speed calculation unit that calculates a moving speed of the pupil based on a position of the pupil detected by the pupil detection unit;
• a pupil diameter calculation unit that calculates a pupil diameter of the pupil based on the pupil detected by the pupil detection unit;
• and
• an adjustment unit that adjusts brightness of the virtual image based on at least the pupil diameter, wherein
• the pupil diameter calculation unit
• outputs the pupil diameter to the adjustment unit based on a comparison result between the moving speed calculated by the moving speed calculation unit and a threshold,
• calculates the pupil diameter at a present time based on the pupil at the present time detected by the pupil detection unit in a case in which the moving speed is equal to or lower than the threshold, and outputs the calculated pupil diameter at the present time to the adjustment units, and
• outputs the pupil diameter calculated at a previous time to the adjustment unit as the pupil diameter at the present time in a case in which the moving speed exceeds the threshold.