Pixel circuit and display device having the same

A display device comprising:

• a display panel having a plurality of pixel circuits;
• a scan driving unit configured to provide a scan signal to the pixel circuits;
• a data driving unit configured to provide a data signal to the pixel circuits;
• and
• a timing control unit configured to control the scan driving unit and the data driving unit,
• wherein each of the pixel circuits comprises:
• a switching TFT including i) a first gate electrode electrically connected to a first gate line, ii) a first source electrode electrically connected to a data line, and iii) a first drain electrode electrically connected to a pixel electrode;
• and
• a light sensing TFT including i) a second gate electrode electrically connected to a second gate line, ii) a second source electrode electrically connected to the first gate line, and iii) a second drain electrode electrically connected to the first drain electrode and the pixel electrode.

A pixel circuit comprising:

• a switching thin-film transistor (TFT);
• a light sensing TFT;
• a data line electrically connected to the switching TFT;
• a first gate line electrically connected to a first gate electrode of the switching TFT and a second source electrode of the light sensing TFT;
• and
• a pixel electrode electrically connected to a first drain electrode of the switching TFT and a second drain electrode of the light sensing TFT.