Patent ID: 9535278
Date: 2017-01-03
CPC Classifications: G02F,G06F,G09G

Claim:
1. A liquid crystal display device having a plurality of pixels arranged in a matrix, comprising: a first substrate; a second substrate; a liquid crystal interposed between the first and the second substrates; and a detection circuit, wherein the second substrate has a detection electrode for a touch panel; each of the pixels includes a pixel electrode and a counter electrode; the counter electrode is applied with a counter voltage for displaying and a touch scanning voltage for detecting a touch coordinate; the counter electrode is divided into a plurality of blocks; the counter electrode divided into blocks is provided common to the respective pixels on a plurality of consecutive display lines; the counter electrode divided into blocks serves as a scanning electrode for the touch panel, the detection circuit includes a calibration capacity element provided for each detection electrode, having one end connected to the detection electrode, and supplies a calibration voltage to the other end of the calibration capacity element in a touched position detection process for each intersection between the respective detection electrodes and the scanning electrodes, the detection circuit supplies a reference voltage to both ends of the calibration capacity element, and a voltage of the detection electrode is varied by the calibration voltage supplied to the other end of the calibration capacity element in the touched position detection process.