Image display device

An image display device comprising:

• a source wiring formed within a display screen;
• a first gate wiring that is formed within the display screen and intersects the source wiring to scan a first pixel electrode corresponding to a first scanning period;
• a second gate wiring that is formed adjacent to the first gate wiring to scan a second pixel electrode corresponding to a second scanning period consecutive to the first scanning period;
• a read signal line disposed in parallel to the source wiring;
• a first switching element that connects an output of a first light sensing element to the read signal line based on a scanning signal of the first gate wiring;
• a second switching element that connects an output of a second light sensing element to the read signal line based on a scanning signal of the second gate wiring;
• a light detection circuit configured to detect the presence or absence of light directed at the light sensing element upon receiving an output of the first or second light sensing element connected to the read signal line;
• and
• a light detection signal processing circuit that is connected with the light detection circuit to detect an input coordinate based on the output of the light detection circuit;
• wherein, when the first pixel electrode and the second pixel electrode are AC driven in the same polarity, the output of the first light sensing element is not used for detecting the input coordinate in the light detection signal processing circuit.