Patent ID: 8325116
Filing Date: 2012-12-04
Classification: G09G

Abstract:
1. An image display apparatus comprising: a light-emitting device of which emission luminance varies with the amount of current; a first transistor having first electrode, second electrode and third electrode, wherein the amount of current between the first electrode and the second electrode is adjusted by a potential applied to the third electrode; a second transistor having fourth electrode, fifth electrode and sixth electrode, wherein the amount of current between the fourth electrode and the fifth electrode is adjusted by a potential applied to the sixth electrode; and a capacitor having seventh electrode and eighth electrode and forming a capacitance between the seventh electrode and the eighth electrode, the first electrode being electrically connected to the light-emitting device, wherein the amount of current in the light-emitting device is controlled by adjusting the amount of current between the first electrode and the second electrode, the fourth electrode being electrically connected to the first electrode, the fifth electrode being electrically connected to the third electrode, the seventh electrode being electrically connected to the third electrode, a parasitic capacitance between the fifth electrode and the sixth electrode being set at a larger value than a parasitic capacitance between the fourth electrode and the sixth electrode, wherein an amount of variation of voltage between the third electrode and the second electrode is increased as an absolute of a punch through voltage of the first transistor is increased when a process moves from a compensation period to a writing period, in the compensation period, charge corresponding to a threshold voltage of the first transistor is accumulated in the capacitor while the second transistor is set in a conducting state in which current can flow between the fourth electrode and the fifth electrode so as to compensate for the threshold voltage, and in the writing period, the charge corresponding to the emission luminance of the light-emitting device is accumulated in the capacitor.