A touch screen panel comprising: a touch screen comprising: a liquid crystal layer having a first side and a second side; a first transparent electrode provided at the first side of the liquid crystal layer; and a second transparent electrode provided at the second side of the liquid crystal layer; characterised in that the touch screen panel further comprises: a display driver configured to supply a scan signal to the first transparent electrode and a driving voltage corresponding to received image data to the second transparent electrode in a first mode of operation of the touch screen panel; a touch sensor configured to transfer a sensing signal to the second transparent electrode, to receive a response signal of the first transparent electrode in response to a touch of a user on the touch screen, and to calculate coordinates of a position touched by a user based on the received response signal in a second mode of operation of the touch screen panel; and a touch screen controller configured to transfer the image data to the display driver and control the display driver to display an image according to the image data on the touch screen in the first mode of operation of the touch screen panel and further configured to receive a touch sensing signal corresponding to the calculated coordinates from the touch sensor in response to the touch of the user on the touch screen in the second mode of operation of the touch screen panel. a touch screen comprising: a liquid crystal layer having a first side and a second side; a first transparent electrode provided at the first side of the liquid crystal layer; and a liquid crystal layer having a first side and a second side; a first transparent electrode provided at the first side of the liquid crystal layer; and a second transparent electrode provided at the second side of the liquid crystal layer; characterised in that the touch screen panel further comprises: a display driver configured to supply a scan signal to the first transparent electrode and a driving voltage corresponding to received image data to the second transparent electrode in a first mode of operation of the touch screen panel; a touch sensor configured to transfer a sensing signal to the second transparent electrode, to receive a response signal of the first transparent electrode in response to a touch of a user on the touch screen, and to calculate coordinates of a position touched by a user based on the received response signal in a second mode of operation of the touch screen panel; and a touch screen controller configured to transfer the image data to the display driver and control the display driver to display an image according to the image data on the touch screen in the first mode of operation of the touch screen panel and further configured to receive a touch sensing signal corresponding to the calculated coordinates from the touch sensor in response to the touch of the user on the touch screen in the second mode of operation of the touch screen panel. a display driver configured to supply a scan signal to the first transparent electrode and a driving voltage corresponding to received image data to the second transparent electrode in a first mode of operation of the touch screen panel; a touch sensor configured to transfer a sensing signal to the second transparent electrode, to receive a response signal of the first transparent electrode in response to a touch of a user on the touch screen, and to calculate coordinates of a position touched by a user based on the received response signal in a second mode of operation of the touch screen panel; and a touch screen controller configured to transfer the image data to the display driver and control the display driver to display an image according to the image data on the touch screen in the first mode of operation of the touch screen panel and further configured to receive a touch sensing signal corresponding to the calculated coordinates from the touch sensor in response to the touch of the user on the touch screen in the second mode of operation of the touch screen panel.