Display device and information terminal device

Abstract

A liquid crystal display apparatus according to the present invention includes a pixel array unithaving signal lines and scanning lines respectively arranged side by side, a signal line drive circuitwhich drives the signal lines, a scanning line drive circuitwhich drives the scanning lines, a signal processing output circuitwhich serially outputs the picked-up image data supplied from the sensors, and a sync signal generation circuitA black-white change obtained in the picked-up image data when a finger is brought close to or brought into contact with the pixel array unitis detected, and the coordinate position of the finger is identified taking the ambient brightness into consideration. Regardless of whether the surroundings are bright or dark, therefore, the coordinate position can be detected with high precision. Furthermore, when conducting the coordinate detection, the picked-up image data corresponding to all pixels are not detected, but the picked-up image data are detected every a plurality of pixels in both the signal line direction and the scanning line direction. Therefore, the time taken to detect the coordinates can be shortened.