DISPLAY DEVICE WITH TOUCH SENSOR

摘要

A common electrode for a display, which is originally provided in a liquid crystal display element, is also used as one (drive electrode) of a pair of electrodes for a touch sensor, and the other (detection-electrode-for-the-sensor) of the pair of electrodes is newly formed. An existing common drive signal as a drive signal for display is used in common for a drive signal for the touch sensor. A capacitance is formed between the common electrode and the detection-electrode-for-the-sensor, and touch detection is performed by utilizing a change of this capacitance caused by a finger touch of a user. Thus, a display device with a touch sensor is also applicable to a mobile device in which electric potential of the user is inconstant in many cases. The newly-provided electrode is only the detection-electrode-for-the-sensor, and it is unnecessary to newly prepare a drive signal for the touch sensor.

主权项

1. A display device comprising:
a pixel substrate; a common electrode disposed on the pixel substrate; at least one touch detecting electrode disposed on the pixel substrate; an opposed electrode facing the pixel substrate; at least one pixel electrode arranged between the pixel substrate and the opposed substrate; and a display function layer interposed between the pixel substrate and the opposed substrate within an image display area, wherein,
the common electrode and the at least one touch detecting electrode are formed on a substantially same plane of the pixel substrate, and electrically isolated each other.