Matrix sensor for image touch sensing

Abstract

Embodiments described herein include a display device having a capacitive sensing device, a processing system and a method for detecting presence of an input object using a capacitive sensing device, all of which include a grid electrode for improved absolute sensing. Other embodiments include a display device having a capacitive sensing device, a processing system and a method for detecting presence of an input object using a capacitive sensing device, wherein the capacitive sensing device includes a matrix of discrete sensor electrodes.

1 . A display device having an integrated capacitive sensing device, the display device comprising:
 a plurality of sensor electrodes arranged in a matrix, wherein each sensor electrode comprises at least one common electrode configured to be driven for display updating and capacitive sensing, the plurality of sensor electrodes including a first sensor electrode and a second sensor electrode comprising part of a common row or column of the matrix, wherein the first sensor electrode is overlapped with the second sensor electrode; and   a processing system coupled to the sensor electrodes, the processing system is configured to, in a first processing mode, modulate the first sensor electrode and the second sensor electrode to acquire measurements of changes in absolute capacitance indicative of positional information for an input object in a sensing region of the capacitive sensing device based on the measurements.   
     
     
         2 - 28 . (canceled)