Display apparatus

A display device comprising:

• a first display panel configured to display first information;
• a second display panel selectively placed in a superimposed position, in which the second display panel is superimposed on the first display panel, and a non-superimposed position, in which the second display panel is not superimposed on the first display panel, and configured to display second information;
• a touch panel disposed on the second display panel;
• and
• a control unit configured to, when the first and the second display panels are placed in any one of the superimposed position and the non-superimposed position, selectively apply driving voltage to the first and second display panels based on a signal detected from the touch panel.

A display device comprising:

• a first display panel configured to display first information;
• a second display panel selectively placed in a superimposed position, in which the second display panel is superimposed on the first display panel, and a non-superimposed position, in which the second display panel is not superimposed on the first display panel, and configured to display second information;
• a first touch panel disposed on the first display panel;
• a second touch panel disposed on one surface of the second display panel which is rotated relatively to the first touch panel;
• and
• a control unit configured to selectively apply driving voltage to the first and second display panels based on a signal detected from the first or second touch panels.