Patent ID: 11922875
Assignee: SHARP KABUSHIKI KAISHA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 12:
13. A pixel circuit provided in a display device including a display portion that includes a plurality of data signal lines, a plurality of scanning signal lines intersecting the plurality of data signal lines, and a plurality of emission control lines disposed along the plurality of scanning signal lines, in such a manner that the pixel circuit corresponds to any one of the plurality of data signal lines, corresponds to any one of the plurality of scanning signal lines, and corresponds to any one of the plurality of emission control lines, the pixel circuit comprising:
a display element driven by a current;
a holding capacitor;
a drive transistor configured to control a current flowing through the display element in accordance with a data voltage held in the holding capacitor;
a write control switching element having a control terminal connected to a corresponding scanning signal line;
at least one emission control switching element that has a control terminal connected to a corresponding emission control line and is connected in series with the display element; and
an initialization circuit configured to initialize the display element, wherein
the initialization circuit includes a display element initialization switching element and is configured such that when a voltage of the corresponding emission control line is at a level for turning off the emission control switching element, an initialization voltage for initializing the display element is applied to the display element via the display element initialization switching element based on the voltage of the corresponding emission control line,
the display portion further includes:
a first power line configured to supply a high-voltage side power supply voltage,
a second power line configured to supply a low-voltage side power supply voltage, and
a low-voltage-side voltage line configured to supply a predetermined low-voltage-side voltage corresponding to the initialization voltage,

the emission control switching element and the display element initialization switching element are N-channel transistors,
a first electrode of the display element is connected to the first power line via the emission control switching element and is connected to the corresponding emission control line via the display element initialization switching element, and a second electrode of the display element is connected to the second power line,
a control terminal of the display element initialization switching element is connected to the low-voltage-side voltage line, and
the low-voltage-side voltage is higher than a voltage of the corresponding emission control line at a level for turning off the emission control switching element such that the display element initialization switching element is in an on-state when the voltage of the corresponding emission control line is at the level.