A display device comprises a plurality of gate lines disposed in a first direction; a plurality of data lines disposed in a second direction different from the first direction and defining a plurality of pixels with the plurality of gate lines; a sensor pixel part including the plurality of pixels; a photo touch sensor disposed in the sensor pixel part; a first read-out line transferring a touch sensing signal of the photo touch sensor and a second read-out line configured to detect a noise, the first and second read-out lines disposed between the data lines in the second direction; a sensing data line disposed in the second direction and applying a sensor data signal to the photo touch sensor; and a sensing display gate line disposed in the first direction and applying a sensor gate signal to the photo touch sensor.