Source driver controlling slew rate
First Claim
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1. A source driver, of a liquid crystal display device, comprising:
- a plurality of output buffers to drive source lines;
a voltage sharing unit to share voltage levels on the source lines during a charge-sharing interval; and
a controller configured to generate a slew-rate control signal in response to the charge-sharing interval, the slew-rate control signal being input to the plurality of output buffers, whereinslew rates of the plurality of output buffers vary according to the input slew-rate control signal,the controller generates the slew-rate control signal that is activated after an end of the charge-sharing interval, andthe slew-rate control signal is not active during the charge-sharing interval.
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Abstract
A source driver employed in a liquid crystal display device uses a slew-rate control signal to regulate a slew rate of its output buffers, which makes an output voltage selectively operable at a low slew rate. Such a source driver can reduce (if not prevent) distortion of a common voltage.
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Citations
11 Claims
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1. A source driver, of a liquid crystal display device, comprising:
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a plurality of output buffers to drive source lines; a voltage sharing unit to share voltage levels on the source lines during a charge-sharing interval; and a controller configured to generate a slew-rate control signal in response to the charge-sharing interval, the slew-rate control signal being input to the plurality of output buffers, wherein slew rates of the plurality of output buffers vary according to the input slew-rate control signal, the controller generates the slew-rate control signal that is activated after an end of the charge-sharing interval, and the slew-rate control signal is not active during the charge-sharing interval. - View Dependent Claims (2, 3, 4, 5)
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6. A source driver, of a liquid crystal display device, comprising:
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output buffers to drive source lines; output switches to regulate output voltages on the source lines; charge-sharing switches to share voltage levels on the source lines during a charge-sharing interval; and a control signal generator configured to provide a slew-rate control signal in response to the charge-sharing interval, the slew-rate control signal being input to the plurality of output buffers, and to provide switching signals for operating the output switches and the charge-sharing switches, in response to an end of the charge-sharing interval, wherein the slew rate control signal regulates slew rates of the output buffers and is not active during the charge-sharing interval, the control signal generator includes at least one of; a switch controller that generates the switching signals, the switching signals including an output-switch control signal and a sharing-switch control signal to regulate the output switches and the charge-sharing switches, respectively; and a slew-rate controller that generates the slew-rate control signal, the output-switch control signal and the sharing-switch control signal are generated with reference to an output enable signal received from an entity external to the source driver; and the slew-rate control signal is generated in response to the sharing-switch control signal. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification