A smartphone may include a first cover layer and an LCD panel located under the first cover layer. The smartphone may include a backlight unit which may be located under the LCD panel. The smartphone may include a touch sensor which may sense touch in a capacitive manner. The backlight unit may include a pressure sensor and a spacer layer. The pressure sensor may include one or more electrodes formed in a single layer attached on the second cover layer and spaced apart from the reflective sheet. A driving signal may be applied to the touch sensor. A touch position may be detected by a sensing signal which may be output from the touch sensor. A magnitude of a touch pressure may be detected based on a change amount of capacitance which may be output from the pressure sensor.