Display device including optical sensors

A display device provided with a plurality of optical sensors, comprising:

• a display panel including two-dimensionally arranged pixel circuits and optical sensors;
• a driver circuit for performing operations of writing signals to the pixel circuits in accordance with display data provided at least every unit period and reading signals from the optical sensors in accordance with amounts of received light;
• a recognition processing portion for performing recognition processing on a recognition target image based on signals being read from the optical sensors, and outputting coordinate data indicating a position of a sensing target;
• a mode control portion for determining whether a mode is normal or standby and causing the recognition processing portion to operate in the normal mode or stop operating in the standby mode;
• and
• an image storage portion for storing a first comparison image based on signals being read from the optical sensors in transition from the normal mode to the standby mode, wherein,
• the mode control portion causes transition from the standby mode to the normal mode when a unit period at the time of storage of the first comparison image is considered as a first unit period and a second comparison image based on signals being read from the optical sensors in at least one subsequent odd-number unit period changes to a predetermined degree or more from the first comparison image.