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

Claim 10:
11. 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;
a threshold compensation switching element;
a control voltage initialization switching element;
first and second emission control switching elements that each have a control terminal connected to a corresponding emission control line and that are each 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, a second power line, and an initialization voltage line configured to supply the initialization voltage,
a first electrode of the display element is connected to the first power line via the first and second emission control switching elements, 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 corresponding emission control line,
the initialization voltage line is connected to the first electrode of the display element via the display element initialization switching element,
the drive transistor includes:
a first conductive terminal that is connected to a corresponding data signal line via the write control switching element and is connected to the first power line via the first emission control switching element,
a second conductive terminal that is connected to the first electrode of the display element via the second emission control switching element, and
a control terminal that is connected to the second conductive terminal via the threshold compensation switching element, is connected to the first power line via the holding capacitor, and is connected to the initialization voltage line via the control voltage initialization switching element,

a control terminal of the control voltage initialization switching element is connected to a scanning signal line selected before the corresponding scanning signal line,
control terminals of the first and second emission control switching elements and the display element initialization switching element are connected to the corresponding emission control line,
the drive transistor, the write control switching element, and the first and second emission control switching elements are P-channel transistors, and
the threshold compensation switching element, the control voltage initialization switching element, and the display element initialization switching element are N-channel transistors that each have a channel layer formed of an oxide semiconductor.