Display device with integrated touch function

A display device, comprising:

• an insulating substrate;
• a plurality of pixels formed on the insulating substrate and arranged in a matrix of rows and columns, the pixels forming a plurality of pixel blocks formed of a plurality of rows and columns of the pixels;
• a sensor circuit arranged in a space between adjacent rows of pixels on the insulating substrate in each pixel block and including a coupling electrode, a detection electrode arranged adjacent to the coupling electrode for forming a coupling capacitance therebetween, and a reading-out circuit to read out a potential of the detection electrode;
• a plurality of scanning lines extending along the pixels arranged in the row direction;
• a plurality of signal lines extending along the pixels arranged in the column direction;
• a driver circuit for writing an image signal into the respective pixels through the signal lines by driving the scanning lines in a period to drive the pixels, wherein the signal lines are used as a precharge line to supply a precharge voltage to the detection electrode and a reading-out line to read out the potential of the detection electrode in a driving period for driving the sensor circuit;
• a coupling line extending in the column direction to change a potential of the coupling electrode, wherein a potential change of the detection electrode is read out by driving the coupling line;
• and
• a peripheral circuit including a TCON, a microcomputer, a memory, an A/D converter, and a comparison circuit to compare an output signal of the sensor circuit with a reference voltage, wherein
• each of the pixel blocks comprises a plurality of display pixel units respectively including a red display pixel, a green display pixel, and a blue display pixel, and arranged in the rows and columns,
• the detection electrode extends in the row direction crossing a plurality of signal lines, and is formed integrally over the display pixels of the display pixel units arranged in the row direction in one block,
• the detection electrode is arranged in a space between the adjacent rows of the display pixels,
• the detection electrode in one block is electrically separated from the detection electrode arranged in an adjacent block in the row direction,
• the detection electrode includes two ends extending in the row direction, and a coupling electrode is branched from the coupling line to extend in the row direction facing the two ends of the detection electrode, and
• a contacted position is detected only by a magnitude of the coupling capacitance.