Abstract: Determination means determines for every column pin whether or not display data of a current horizontal scan period (display time period) is the same as that of a next horizontal scan line (display time period). When the display data for one horizontal line are identical, an anode of an OEL element is connected to this terminal pin and then the drive current of the OEL element having a cathode to be scanned next in the vertical direction becomes substantially the same. Then, when a next vertical line is scanned for the column pin having display data, which is determined as identical, the resetting of the OEL element is inhibited by the reset inhibit circuit and the generation of peak current in a next horizontal scan period (display time period D) is stopped.

Abstract: A drive circuit of an active matrix type organic EL display panel includes a drive current generator circuit for generating drive currents corresponding to the red, green and blue colors in a predetermined sequence in response to a RGB switching signal and a current switching circuit having a first, second and third output terminals corresponding to the respective red, green and blue colors, the current switching circuit adapted to select one of the first, second and third output terminals in the predetermined sequence in response to the RGB switching signal, generate currents for charging the capacitors of the pixel circuits for the red, green and blue colors in response to the drive currents and output the charging current to the output terminals.

Abstract: An organic EL element drive circuit includes a current mirror circuit, a first current output circuit for generating a current having a first value in response to an output current of one of output side transistors of the current mirror circuit and a current generator circuit. An input terminal of the organic EL element drive circuit is supplied with a current having a second value from a second current output circuit of another organic EL element drive circuit preceding to the organic EL element drive circuit, which has substantially the same construction as that of the first current output circuit, to generate a predetermined drive current and the input transistor of the current mirror circuit is driven by the predetermined drive current to generate the first current value corresponding to the second current value.

Abstract: A drive current having a peak current, for driving an organic EL display panel, is generated by generating the peak current in output side transistors of a current mirror circuit having a plurality of input side transistors by driving one of the input side transistors with a predetermined current and reducing an output current of the output side transistors from the peak current to a steady current by reducing the drive current per one input side transistor by branching the predetermined current to the other input side transistors connected in parallel to the one input side transistor.

Abstract: An organic EL drive circuit comprises a first current mirror circuit provided in a drive stage of a current drive circuit having an input stage for generating a reference current and an output stage for current-driving terminals of an organic EL display panel and having n output side transistors connected in current mirror relation to an input side drive transistor, for driving said output stage, where n is an integer equal to or larger than 30 and a drive current regulator circuit for regulating drive current of said input side drive transistor. The input side drive transistor is arranged in a center portion of an arrangement of the n output side transistors and an output current of the output stage is regulated by the drive current regulator circuit.

Abstract: In the present invention, an input terminal of a flip-flop circuit in master slave form which is formed by connecting two inverters in a loop shape is connected to a first terminal via a first switch circuit, an output terminal of the flip-flop circuit is connected to a second terminal via a second switch circuit, a third switch circuit is provided between the path from the first switch circuit to the input terminal and the second terminal, a fourth switch circuit is provided between the path from the output terminal to the second switch circuit and the first terminal, and through turning ON the first and second switch circuits and turning OFF the third and fourth switch circuits the first terminal is rendered operable as an input terminal and the second terminal is rendered operable as an output terminal, and through turning OFF the first and second switch circuits and turning ON the third and fourth switch circuits the second terminal is rendered operable as an input terminal and the first terminal is rende

Abstract: An organic EL drive circuit comprises a first current mirror circuit provided in a drive stage of a current drive circuit having an input stage for generating a reference current and an output stage for current-driving terminals of an organic EL display panel and having n output side transistors connected in current mirror relation to an input side drive transistor, for driving said output stage, where n is an integer equal to or larger than 30 and a drive current regulator circuit for regulating drive current of said input side drive transistor. The input side drive transistor is arranged in a center portion of an arrangement of the n output side transistors and an output current of the output stage is regulated by the drive current regulator circuit.