| 摘要 |
<P>PROBLEM TO BE SOLVED: To restrain fluctuations in current value attributable to fluctuations in the threshold voltage of a transistor, and to provide a display device that little deviates from a luminance level designated by a video signal and has a high duty ratio. <P>SOLUTION: By providing loads, a transistor that controls the values of currents supplied to the loads, a capacitance element, a power feed line, and first through third switches, inputting a potential corresponding to a video signal after causing the capacitance element to hold the threshold voltage of the transistor, and causing a voltage resulting from the addition of the potential to the threshold voltage, fluctuations in current value attributable to fluctuations in the threshold voltage of the transistor can be restrained. This enables loads including a light emitting element to be supplied with respectively desired currents, and a display device whose duty ratio is enhanced by varying the potential of the power feed line to be provided. <P>COPYRIGHT: (C)2012,JPO&INPIT |
