Patent ID: 8115752
Filing Date: 2012-02-14
Classification: G06F

Abstract:
1. 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 light sensing element connected to the second gate wiring and the read signal line; 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 light sensing element, wherein the first pixel electrode and the second pixel electrode are AC driven in the same polarity, the output of the light sensing element is connected via the read signal line to the light detection circuit for a predetermined interval during the second scanning period, and light sensing elements are disposed only in every other row as defined by the first and second gate wiring; 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 a difference between a gradation value displayed at the first pixel electrode and a gradation value displayed at the second pixel electrode is a predetermined value or more, the output of the light sensing element is not used for detecting the input coordinate.