Smartphone

A smartphone comprising:

• a first cover layer;
• an LCD panel which is located under the first cover layer and comprises a liquid crystal layer, and a first glass layer and a second glass layer between which the liquid crystal layer is placed;
• a backlight unit which is located under the LCD panel and comprises an optical film, a light source, a reflective sheet and a second cover layer;
• and
• a touch sensor which senses touch in a capacitive manner,
• wherein the backlight unit further comprises a pressure sensor and a spacer layer, the pressure sensor comprising a plurality of electrodes formed in a single layer attached on the second cover layer and spaced apart from the reflective sheet, between the reflective sheet and the second cover layer,
• wherein a driving signal is applied to the touch sensor and a touch position is detected by a sensing signal which is output from the touch sensor,
• wherein a magnitude of a touch pressure is detected based on a change amount of capacitance which is output from the pressure sensor and which is changed according to a distance between the pressure sensor and an electrode located within the LCD panel,
• wherein the LCD panel is bent according to the touch,
• and wherein the change amount of the capacitance output from the pressure sensor changes as the LCD panel bends.