Patent ID: 8878756
Filing Date: 2014-11-04
Classification: G09G,H01L

Abstract:
1. A pixel circuit comprising: a display element having a luminance based on a supplied current in a current supply line of the display element; at least one first switching element section whose output current characteristic includes a saturation characteristic in response to an input variable serving as a grayscale signal, the at least one first switching element section configured to output a current in the saturation characteristic region; and at least one second switching element section whose output current characteristic shows a linear characteristic in response to an input variable serving as a grayscale signal, the at least one second switching element section configured to output a current in the linear characteristic region, (i) a first current supply line which outputs the current determined by the at least one first switching element section and (ii) a second current supply line which outputs the current determined by the at least one second switching element section being combined to form the current supply line of the display element and to supply the supplied current to the display element, the at least one first switching element section including at least one thin film transistor having a gate terminal, a source electrode and a drain electrode, the drain electrode of the at least one thin film transistor of the at least one first switching element section connected to an input terminal of the display element, the at least one thin film transistor of the at least one first switching element section configured to generate a first conducting current between the drain electrode of the at least one thin film transistor of the at least one first switching element section and the source electrode of the at least one thin film transistor of the at least one first switching element section that changes in proportion to a square of a voltage difference between the gate terminal of the at least one thin film transistor of the at least one first switching element section and the source electrode of the at least one thin film transistor of the at least one first switching element section, the at least one second switching element section including at least one thin film transistor having a gate terminal, a source electrode and a drain electrode, the drain electrode of the at least one thin film transistor of the at least one second switching element section connected to the input terminal of the display element, the at least one thin film transistor of the at least one second switching element section configured to generate a second conducting current between the source electrode of the at least one thin film transistor of the at least one second switching element section and the drain electrode of the at least one thin film transistor of the at least one second switching element section that changes in proportion to a voltage difference between the source electrode of the at least one thin film transistor of the at least one second switching element section and the drain electrode of the at least one thin film transistor of the at least one second switching element section, and the supplied current to the display element being a sum of a current outputted from the at least one first switching element section and a current outputted from the at least one second switching element section.