DISPLAY DEVICE AND SEMICONDUCTOR DEVICE

摘要

It is an objective to provide a display device capable of detecting a position and a motion of an object even when the object is not in contact with a display panel. The display device includes a display panel provided with photo sensors. When an object is approaching the display panel, the display device detects a shadow of the object, which is cast over the display panel in such a manner that ambient light is blocked by the object, using the photo sensors. A position or a motion of the shadow is detected, so that a position or a motion of the object is detected. The detection can be operated even when the object is not in contact with the display panel.