Patent ID: 8054298
Filing Date: 2011-11-08
Classification: G09G

Abstract:
1. An image displaying apparatus for displaying a desired image on an image displaying section employed in said image displaying apparatus by making use of a signal-line driving circuit and a scan-line driving circuit to drive pixel circuits laid out on said image displaying section to form a pixel matrix, wherein: each of said pixel circuits includes at least a light emitting device, a signal-level holding capacitor, a driving transistor for driving said light emitting device and a signal writing transistor which can be put in a state of being turned on by a write signal output by said scan-line driving circuit; said signal-line driving circuit and said scan-line driving circuit drive each of said pixel circuits so as to put said light emitting device employed in said pixel circuit in a no-light emission state of emitting no light in a no-light emission period and a light emission state of emitting light in a light emission period repeatedly in an alternating manner; in said no-light emission period, after execution of a threshold-voltage variation compensation process of compensating said pixel circuit for variations of the threshold voltage of said driving transistor in said pixel circuit from transistor to transistor by setting a voltage appearing between the two terminals of said signal-level holding capacitor at a voltage dependent on said threshold voltage of said driving transistor, a gradation-voltage setting operation is carried out by putting said signal writing transistor in a state of being turned on, correcting a gradation voltage representing the luminance of light emitted by said light emitting device by making use of said voltage set in advance between said two terminals of said signal-level holding capacitor as said voltage dependent on said threshold voltage of said driving transistor and newly setting said corrected gradation voltage between the gate and source electrodes of said driving transistor; in said light emission period, said driving transistor drives said light emitting device to emit light at a luminance representing a gradation corresponding to said corrected gradation voltage set between said two terminals of said signal-level holding capacitor; in said no-light emission period, said signal-line driving circuit and said scan-line driving circuit drive said pixel circuits on a plurality of any specific pixel-matrix rows in said image displaying section in order to carry out said threshold-voltage variation compensation process at the same time and, then, drive said pixel circuits on said specific pixel-matrix rows sequentially on a row-after-row basis in order to carry out said gradation-voltage setting operation on one of said specific pixel-matrix rows at one time for every one of said specific pixel-matrix rows; and in said no-light emission period, said signal-line driving circuit and said scan-line driving circuit drive said pixel circuits on said specific pixel-matrix rows in said image displaying section also in order to interchange a timing to carry out said gradation-voltage setting operation on one of said specific pixel-matrix rows as an operation lagging behind said threshold-voltage variation compensation process, which has been carried out on all said specific pixel-matrix rows at the same time, with a timing to carry out said gradation-voltage setting operation on another one of said specific pixel-matrix rows as an operation lagging behind said threshold-voltage variation compensation process in a time-axis direction and/or a scan-line direction.