| CPC G09G 3/3233 (2013.01) [G09G 3/3266 (2013.01); G09G 3/3291 (2013.01); G09G 2320/041 (2013.01)] | 17 Claims |
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1. A display device comprising:
a display portion including a plurality of data signal lines, a plurality of scanning signal lines intersecting the plurality of data signal lines, and a plurality of pixel circuits arranged along the plurality of data signal lines and the plurality of scanning signal lines;
a data signal line drive circuit configured to drive the plurality of data signal lines;
a scanning signal line drive circuit configured to selectively drive the plurality of scanning signal lines;
an external compensation circuit configured to measure a current flowing through each of the plurality of pixel circuits and to compensate for a variation in a characteristic of each of the plurality of pixel circuits;
two or more temperature detection circuits arranged such that the two or more temperature detection circuits respectively correspond to two or more intersections among intersections of the plurality of data signal lines and the plurality of scanning signal lines;
a temperature measurement circuit configured to measure a temperature of each of the two or more temperature detection circuits;
a plurality of monitoring control lines provided along the plurality of scanning signal lines such that the plurality of monitoring control lines respectively corresponds to the plurality of scanning signal lines;
a monitoring control line drive circuit configured to drive the plurality of monitoring control lines; and
first and second power supply lines,
wherein
each of the plurality of pixel circuits
includes a display element driven by a current, a holding capacitor, a drive transistor that controls a drive current of the display element in accordance with a voltage held in the holding capacitor, and a switching element for monitoring, and
is configured such that a voltage of a corresponding one of the plurality of data signal lines is written to the holding capacitor when a corresponding one of the plurality of scanning signal lines is selected,
in each of the plurality of pixel circuits,
the drive transistor has a first conductive terminal connected to the first power supply line,
the drive transistor has a second conductive terminal that is connected to the second power supply line via the display element, and that is connected to a data signal line in the plurality of data signal lines corresponding to the pixel circuit via the switching element for monitoring, and
the switching element for monitoring has a control terminal connected to one of the plurality of monitoring control lines corresponding to the pixel circuit,
each of the two or more temperature detection circuits includes a temperature detecting transistor and a switching element for monitoring,
in each of the two or more temperature detection circuits,
the temperature detecting transistor has a first conductive terminal connected to the first power supply line,
the temperature detecting transistor has a second conductive terminal connected to the corresponding one of the plurality of data signal lines via the switching element for monitoring, and
the switching element for monitoring has a control terminal connected to one of the plurality of monitoring control lines corresponding to a scanning signal line in the plurality of scanning signal lines that passes through an intersection corresponding to the temperature detection circuit,
the temperature measurement circuit measures a current flowing through the temperature detecting transistor in each of the two or more temperature detection circuits via the switching element for monitoring and the corresponding one of the plurality of data signal lines to obtain the temperature of each of the two or more temperature detection circuits, and
the external compensation circuit estimates a temperature distribution in the display portion based on the temperature of each of the two or more temperature detection circuits obtained by the temperature measurement circuit, corrects a measurement result of a current in each of the plurality of pixel circuits based on the estimated temperature distribution, and compensates for a variation in a characteristic of each of the plurality of pixel circuits based on the corrected measurement result.
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