Patent ID: 11874997
Assignee: SHARP KABUSHIKI KAISHA
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 8:
9. A display device including: a display unit including pixel circuits of n rows×m columns (n and m are integers greater than or equal to 2), each having a display element provided between a first electrode and a second electrode and configured to emit light at luminance determined based on a drive current flowing through the second electrode from the first electrode, and a drive transistor configured to control the drive current; and a touch panel including a plurality of sensor electrodes for detecting a touch position on the display unit, the display device comprising:
a display drive circuit configured to drive the pixel circuits of n rows×m columns while performing a characteristic detection process to compensate for degradation of the drive transistor or the display element, the characteristic detection process including a process of measuring a current flowing through each pixel circuit;
a touch panel control circuit configured to apply a touch driving signal for detecting a touch position to the plurality of sensor electrodes and to detect a touch position based on detection signals obtained from the plurality of sensor electrodes; and
a display driving noise extracting unit configured to extract, from the detection signals, display driving noise caused by driving of the pixel circuits of n rows×m columns,
wherein the plurality of sensor electrodes are divided into a plurality of blocks such that each block corresponds to pixel circuits in a plurality of consecutive rows and pixel circuits in a plurality of consecutive columns,
the second electrode is divided so as to correspond to the plurality of blocks, and each of divided second electrodes is shared by a corresponding plurality of display elements,
when magnitude of the display driving noise is greater than a predetermined threshold level, the touch panel control circuit applies the touch driving signal to sensor electrodes belonging to a block different from a block corresponding to pixel circuits that are targets for the characteristic detection process, during a current measurement period during which a process of measuring a current is performed, the process being included in the characteristic detection process, and
when the magnitude of the display driving noise is smaller than the predetermined threshold level, the touch panel control circuit applies the touch driving signal to each sensor electrode during a period during which an image writing process for writing a data signal to each pixel circuit is performed, the data signal being based on an image to be displayed on the display unit.