Fitzpatrick, Cella, Harper & Scinto
Driving circuit of display element and image display apparatus
A driving circuit of a display element includes a current source circuit having a first transistor and a holding circuit for holding a gate voltage of the first transistor during a first period at an electric potential corresponding to a constant current to be supplied to the display element, and a control circuit including a second transistor connected in series to the current source circuit and connected in parallel to the display element and the capacitor element whose one terminal is connected to a gate of the second transistor and the other terminal is connected to a line, and controlling the light emission time of the display element by controlling the second transistor during a third period. A constant voltage is applied from the line during the first period. The gray-scale voltage is applied from the line during a second period, and the gate of the second transistor and the one terminal are short-circuited. In addition, an electric charge based on the difference between the gray-scale voltage and the gate voltage of the second transistor is accumulated in the capacitor element, and a sweep voltage is applied during the third period, so that the ON time of the second transistor is controlled.
Canon Kabushiki Kaisha
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Masafumi Ryo Hideya Katsumi
Sano Hayashi Kumomi Abe