Display device with touch sensor

A touch detecting unit for use with a display device, the display device comprising:

• a pixel substrate;
• an opposed substrate facing the pixel substrate;
• at least one pixel electrode arranged between the pixel substrate and the opposed substrate;
• a common electrode facing the at least one pixel electrode;
• and
• a display function layer interposed between the pixel substrate and the opposed substrate within an image display area,
• wherein,
• the touch detecting unit comprises a plurality of touch detecting electrodes configured to detect capacitance variation caused by a touch, the touch detecting electrodes being disposed on the pixel substrate in a region surrounding the common electrode,
• the common electrode functions not only as a drive electrode of image display but also as a drive electrode of touch detection,
• the common electrode and the touch detecting electrodes are coplanar,
• the pixel electrode is used to drive the function layer to effect a display of an image;
• the touch detecting electrodes and the common electrode are capacitively coupled to each other;
• and
• the touch detecting electrodes are time-divisionally scanned.

A display device comprising:

• a pixel substrate;
• an opposed substrate facing the pixel substrate;
• at least one pixel electrode arranged between the pixel substrate and the opposed substrate;
• a display function layer interposed between the pixel substrate and the opposed substrate within an image display area;
• at least one common electrode spaced apart from the at least one pixel electrode;
• and
• a plurality of touch detecting electrodes configured to detect capacitance variation caused by a touch, the touch detecting electrodes being spaced apart from the at least one pixel electrode, the touch detecting electrodes being disposed on the pixel substrate in a region surrounding the at least one common electrode,
• wherein,
• the at least one common electrode and the touch detecting electrodes are coplanar,
• the pixel electrode is used to drive the function layer to effect a display of an image;
• the touch detecting electrodes and the common electrode are capacitively coupled to each other;
• and
• the touch detecting electrodes are time-divisionally scanned.