Display device and method for driving same

摘要

A display device (100) includes a plurality of pixel circuits (10), a gate driver circuit (2) coupled to a plurality of scanning signal lines Gi and a plurality of control lines Ei, and a power control circuit (4) coupled to a plurality of power lines VPi via a common power line. The pixel circuits (10) each include an organic EL element, a plurality of TFTs, and a capacitor, and are controlled to collectively receive initialization potentials at the beginning of a frame through the power lines VPi, collectively perform threshold detection immediately thereafter, and then perform writing and light-emission operations. Thus, the aperture ratio of the pixel circuits (10) can be kept high, the power control circuit (4) typically has only one output buffer so that the circuit scale thereof is small, drive by potential is performed only once, so that power consumption is low, and threshold detection is performed only once, so that a sufficient amount of time can be ensured for a detection period.

主权项

1. An active-matrix display device comprising:
a plurality of video signal lines for transmitting signals representing an image to be displayed; a plurality of scanning signal lines and control lines crossing the video signal lines; a plurality of pixel circuits for forming the image to be displayed, the circuits being arranged in a matrix so as to correspond to intersections of the video signal lines and the scanning signal lines; a plurality of power lines for supplying power potentials to the pixel circuits; a scanning signal line driver circuit for selectively or collectively driving the scanning signal lines and the control lines; a video signal line driver circuit for driving the video signal lines by applying thereto the signals representing the image to be displayed; and a power control circuit for driving the power lines, wherein, the pixel circuit includes:
an electro-optic element to be driven by current provided via the power line;a drive transistor provided in a current path through the electro-optic element, to determine current that is to flow through the path;a write control transistor provided between a control terminal of the drive transistor and the video signal line, to connect the control terminal of the drive transistor and the video signal line when the scanning signal line driver circuit drives and activates the scanning signal line;an emission control transistor provided between one conductive terminal of the drive transistor and the power line, to connect that conductive terminal and the power line when the scanning signal line driver circuit drives and activates the control line; anda capacitor provided between the other conductive terminal of the drive transistor and the control terminal, the scanning signal line driver circuit collectively drives and activates at least a part of the scanning signal lines and at least a part of the control lines, and thereafter selectively drives the scanning signal lines, thereby displaying the image, the at least a part of the scanning signal lines being collectively driven and activated in an initialization period in which to initialize the electro-optic elements and in a threshold detection period in which to compensate for a threshold voltage of the drive transistors, the initialization period being set so as to be later than a start of a frame period, the threshold detection period being set so as to be later than the initialization period, the at least a part of the control lines being collectively driven and activated in the threshold detection period, the power control circuit provides the power lines with initialization potentials to initialize the electro-optic elements in the initialization period and with the power potentials except in the initialization period, and the emission control transistor is made conductive approximately for the same duration by:
in at least a part of a time period after the threshold detection period until at least a part of the scanning signal lines being each finished selecting, the scanning signal line driver circuit driving and deactivating at least a part of the control lines corresponding to the at least a part of the scanning signal lines; andthe scanning signal line driver circuit thereafter collectively driving and activating the at least a part of the control lines in at least a part of a time period until the start of the next initialization period.