Patent ID: 8242985
Filing Date: 2012-08-14
Classification: G09G

Abstract:
1. A display device comprising: a plurality of scanning lines; a plurality of data lines intersecting with each of the plurality of scanning lines; pixel circuits disposed so as to correspond to each intersection of the scanning lines and the data lines; a source driver for supplying, to the data lines, a data potential corresponding to image data; and a scanning driver for supplying, to the scanning lines, a scanning signal to switch each of the pixel circuits between a selection period during which the data potential outputted from the source driver is supplied to each of the pixel circuits, and a non-selection period during which the data potential is not supplied to each of the pixel circuits, each of the pixel circuits comprising: a switching TFT, whose gate terminal is connected to the scanning line and whose source terminal is connected to the data line; a driving TFT, whose gate terminal is connected to a drain terminal of the switching TFT and whose source terminal is connected to a current supply line maintained at a power supply potential; and an optical element connected to a drain terminal of the driving TFT, a luminescence condition of the optical element varying in line with an amount of a current flowing in the optical element, the display device being a current-controlled display device displaying an image corresponding to the image data by controlling, via the driving TFT in line with the data potential, the amount of the current flowing in the optical element, each of the pixel circuits having a retention capacitor, one end of which is connected to a gate terminal of the driving TFT and the other end is connected to a capacitance feedback line, the display device further comprising: a current-voltage conversion circuit for receiving at its input terminal a feedback current which is a current flowing in the driving TFT of a pixel circuit in the selection period at a time of supplying a predetermined potential to the gate terminal of the driving TFT, converting the feedback current into a voltage, and outputting at its output terminal a potential corresponding to the voltage; and a changeover switch to connect the capacitance feedback line to the output terminal of the current-voltage conversion circuit when the pixel circuit to which the capacitance feedback line corresponds is in the selection period and to connect the capacitance feedback line to a fixed potential supply line supplying a fixed potential when the pixel circuit to which the capacitance feedback line corresponds is in the non-selection period.