Display with infrared backlight source and multi-touch sensing function

A display having a multi-touch sensing function, comprising:

• a display panel including a transparent window which transmits an infrared light, which is reflected from an opaque object, and a plurality of infrared ray sensors which sense the infrared light, which is incident via the transparent window;
• and
• a backlight unit radiating the infrared light to the display panel,
• wherein the display panel includes:
• a first transparent substrate where the transparent window is formed;
• a second transparent substrate where the infrared ray sensors are formed;
• and
• a liquid crystal layer which is formed between the first transparent substrate and the second transparent substrate, and
• wherein the second transparent substrate includes:
• a plurality of data lines to which a data voltage is supplied;
• a plurality of gate lines which are arranged to cross the data lines and to be sequentially supplied with a scanning pulse;
• a plurality of read-out lines arranged parallel to the data lines and configured to output an infrared ray sensing signal corresponding to the infrared light, which is reflected from the opaque object;
• a pixel electrode formed at a pixel area, the pixel area defined by the data line, the gate line, and the read-out line;
• a plurality of first thin film transistors formed at a crossing part of the gate lines to supply the data voltage to the pixel electrode in response to the scanning pulse;
• a plurality of first driving voltage supplying lines arranged parallel to the gate lines to supply a high-level driving voltage to a source electrode of the infrared ray sensor;
• a plurality of second driving voltage supplying lines arranged parallel to the gate lines and the first driving voltage lines, to supply a low-level driving voltage to a gate electrode of the infrared ray sensor.