Display device driver circuit
AssigneeOki Electric Industry Co., Ltd.
InventorHijiri Shirasaki
Life of this patent
Estimating the term…
Abstract
A display device driver circuit including a first switching circuit for switching connection and disconnection between an output terminal and a first source line; a second switching circuit for switching connection and disconnection between the output terminal and a second source line; and a selecting circuit for switching a voltage output from the output terminal by controlling the first and second switching circuits. The selecting circuit controls the first and second switching circuits so that the timing for opening one of the switching circuits is faster than the timing for closing the other of the switching circuits. Consequently, a time when both switches are open occurs regularly when the voltage output is switched, so that no current will pass between the switching circuits.
Claims31
A display device driver circuit for a liquid crystal element, comprising:
- a first source line that supplies a driving voltage for the liquid crystal element;
- a second source line that supplies a ground voltage;
- a first switch that switchably connects and disconnects an output terminal and said first source line;
- a second switch that switchably connects and disconnects the output terminal and said second source line;
- and
- a selector that sets a voltage level of the output terminal by opening one of said first and second switches while closing an other of said first and second switches,
- said selector controlling said first and second switches so that one of said first and second switches does not close before the other of said first and second switches opens completely.
A display device driver circuit comprising:
- a first source line that supplies a first potential;
- a second source line that supplies a second potential which is lower than the first potential;
- an output terminal which outputs an output signal having either of the first and second potentials;
- a first switching circuit provided between said first source line and said output terminal;
- a second switching circuit provided between said second source line and said output terminal;
- and
- a selecting circuit which controls opening and closing of said first and second switching circuits so that when the output signal of said output terminal is switched between the first and second potentials, one of said first and second switching circuits is opened before another of said first and second switching circuits is closed.
A display device driver circuit comprising:
- a first switch that switchably connects and disconnects an output terminal and a first source line;
- a second switch that switchably connects and disconnects the output terminal and a second source line;
- and
- a selector that respectively outputs first and second control signals to said first and second switches, to open one of said first and second switches while closing an other of said first and second switches, so that one of said first and second switches does not close before the other of said first and second switches opens completely.
Dependencies are inferred from the claim text.