Driver circuit usable for display panel
AssigneeOki Electric Industry Co., Ltd.
InventorMasanori Satou
Life of this patent
Estimating the term…
Abstract
A driver circuit usable for a display panel can generate an output signal in response to an input pulse signal supplied to only one input signal terminal thereof. The driver circuit includes a pulse generating circuit for generating an output signal at the output terminal. The pulse generating circuit has a first and second differential input stage for respectively driving a push-pull construction of output transistors in response to the input pulse signal supplied through the input signal terminal with respect to the push-pull output, whereby to simplify the circuitry, operate at a high slew rate, and decrease electric current consumption.
Claims3
A driver circuit usable for a display panel having an input signal terminal, an output signal terminal, and a pulse generating part which generates an output signal to said output signal terminal in response to an input pulse signal supplied from said input terminal,
- said pulse generating part comprising:
- an output stage of a push-pull constitution made of a pair of output transistors, for its push-pull output to said output signal terminal;
- first and second differential amplifier stages for respectively operating said output transistors on the basis of an electric potential at said output signal terminal in response to said input pulse signal;
- two current paths, each of which includes a resistor;
- a current mirror circuit for flowing electric currents of substantially the same magnitude to said two current paths;
- and
- a superimposing stage for superimposing an amplifier signal on output voltages generated by said first and second input differential amplifier stages, said amplifier signal being obtained by amplifying said input pulse signal with reference to said electric potential at said output signal terminal,
- wherein
- said first and second differential amplifier stages are respectively driven by power-supply voltages which are different from each other,
- a middle point of said output stage is connected to said output signal terminal,
- one of input terminals of said first differential amplifier stage and one of input terminals of said second differential amplifier stage are connected to said input signal terminal,
- the other input terminal of said first differential amplifier stage and the other input terminal of said second differential amplifier stage are connected to an electric potential at said middle point of said output stage,
- one of output terminals of said first differential amplifier stage and one of output terminals of said second differential amplifier stage are connected to gate terminals of said output transistors, respectively,
- the other output terminal of said first differential amplifier stage and the other output terminal of said second differential amplifier stage are connected to a first referential potential and a second referential potential, and
- said first and second referential potentials are produced at both ends of one of said resistors.
Dependencies are inferred from the claim text.