Display device

A display device, comprising:

• a display unit that includes a display surface emitting video light for displaying a composite image of a first image and a second image different from the first image;
• a separation unit that separates the video light into first video light representing the first image and second video light representing the second image;
• a detection unit that detects a position of an observer looking at the composite image;
• and
• an image control unit that controls a direction of the composite image in accordance with the position of the observer detected by the detection unit, wherein
• the detection unit detects a position of the eyes of the observer,
• the image control unit specifies an observation direction in which a direction extending from the position of the eyes of the observer, which is detected by the detection unit, toward the display surface is projected onto a plane including the display surface,
• causes the display unit, in a case where an angle between the specified observation direction and a reference direction, which is a direction perpendicular to a reference side of the display surface, is zero degrees, to display the composite image at a position where a base of the composite image matches the reference side, and, in a case where the angle between the observation direction and the reference direction is within a first range of zero degrees ±20 degrees excluding zero degrees, a second range of 90 degrees ±20 degrees, a third range of 180 degrees ±20 degrees, or a fourth range of 270 degrees ±20 degrees, to display the composite image at a position where the base of the composite image is rotated by an angle between the observation direction and the reference direction from the reference side, and
• causes the display unit to display only one of the first image or second image at a position where the base of the one of the first image or second image is rotated by an angle between the observation direction and the reference direction from the reference side in a case where the angle between the observation direction and the reference direction is outside the first range, the second range, the third range, and the fourth range, and
• the separation unit has a barrier pattern that is configured by a slit portion for transmitting the video light from the display unit and a shielding portion for shielding the video light, the display device further comprising:
• a barrier pattern control unit that transmits the entire video light from the display unit without forming the barrier pattern on an entire surface of the separation unit in the case where the angle between the observation direction and the reference direction is outside the first range, the second range, the third range, and the fourth range.