Display device

A display device that presents a left image viewable from left of a display surface and presents a right image viewable from right of the display surface, the display device comprising:

• a plurality of left pixel columns each including a plurality of left pixels that displays the left image;
• a plurality of right pixel columns each including a plurality of right pixels that displays the right image;
• a parallax barrier that blocks light traveling from the left pixels toward the right and light traveling from the right pixels toward the left;
• a left-pixel signal line provided for each of the plurality of left pixel columns and connected in common to the plurality of left pixels included in each left pixel column;
• a right-pixel signal line provided for each of the plurality of right pixel columns and connected in common to the plurality of right pixels included in each right pixel column;
• a black voltage line that supplies a black voltage to cause either the plurality of left pixels or the plurality of right pixels to display a black image;
• a video signal line that supplies a video signal to cause the left pixels and the right pixels to display a common image as the left image and the right image;
• and
• a switch configured to switch between:
• a first mode for connecting only one of the left-pixel signal line or the right-pixel signal line to the black voltage line and connecting an other one of the left-pixel signal line or the right-pixel signal line to the video signal line;
• and a second mode for connecting both the left-pixel signal line and the right-pixel signal line to the video signal line.