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US 5,963,188 AGranted
Gate driving circuit for liquid crystal display
AssigneeLG Electronics Inc.
InventorYoung-Dae Kim
Life of this patent
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Abstract
A gate driving circuit of an LCD having a data driver includes an output generator coupled to the data driver and generating a plurality of non-overlapping output signals from the data driver for driving a gate line, and a gate line level controlling unit coupled to the output generator and sequentially controlling a signal level of the gate line according to the non-overlapping output signals.
Claims17
A driving circuit for an LCD comprising:
- a data driver having an output generator, the output generator generating first and second waveforms each having a plurality of pulses;
- and
- a gate line level controlling unit coupled to the output generator and sequentially controlling a signal level of the gate line in response to the first and second waveforms,
- wherein the gate line is charged in response to a first pulse of the first waveform and discharged in response to a first pulse of the second waveform, and
- wherein the first pulse of the first waveform and the first pulse of the second waveform do not overlap with each other.
2 more elements
A driving circuit for an LCD comprising:
- a data driver having an output generator, the output generator generating a plurality of non-overlapping output signals;
- and
- a gate driver having a gate line level controlling unit coupled to the output generator and sequentially controlling a signal level of the gate line according to the non-overlapping output signals, wherein the gate line level controlling unit includes
- a first transistor bypassing a corresponding gate line signal according to a first one of the non-overlapping output signals;
- a second transistor switching the corresponding gate line signal according to a second one of the non-overlapping output signals;
- a logic gate unit coupled to the second transistor and producing a logical output signal according to the second transistor;
- and
- a third transistor producing a gate line signal of a next stage according to a third one of the non-overlapping output signals.
5 more elements
A gate driving circuit for an LCD having a data driver, comprising:
- an output generator coupled to the data driver and generating at least three non-overlapping output signals from the data driver for driving a gate line;
- and
- a gate line level controlling unit coupled to the output generator and sequentially controlling a signal level of the gate line according to the non-overlapping output signals, the gate line level controlling unit including:
- a first passgate transistor bypassing a corresponding gate line signal according to a first one of the non-overlapping output signals;
- a switching transistor switching the corresponding gate line signal according to a second one of the non-overlapping output signals;
- an NAND gate coupled to the switching transistor and producing a logical output signal according to an operating state of the switching transistor and a third one of the non-overlapping output signals;
- an inverter for inverting the output of the NAND gate;
- and
- a second passgate transistor producing a gate line signal of a next stage according to the second non-overlapping output signal.
6 more elements
A method of driving a liquid crystal display device including a plurality of gate lines and a data driver, the method comprising the steps of:
- producing a first waveform having a plurality of pulses and a second waveform have a plurality of pulses, in order, through the data driver, a time-interval from a first one of the pulses of the first waveform to a first one of the pulses of the second waveform being larger than a time-interval from the first one of the pulses of the second waveform to a second one of the pulses of the first waveform;
- charging one of the gate lines in response to the first one of the pulses of the first waveform;
- and
- discharging the charged gate line in response to the first one of the pulses of the second waveform.
1 more element
A method of driving a liquid crystal display device including a gate line and a data driver, the method comprising the steps of:
- generating first and second waveforms from the data driver, the first and second waveforms each having a plurality of pulses;
- and sequentially controlling a signal level of the gate line in response to the first and second waveforms from the data driver, wherein the step of sequentially controlling includes
- charging the gate line in response to a first pulse of the first waveform, and
- discharging the gate line in response to a first pulse of the second waveform,
- wherein the first pulse of the first waveform and the first pulse of the second waveform do not overlap with each other.
2 more elements
A method of driving a liquid crystal display device including a gate line and a data driver, the method comprising the steps of:
- generating a plurality of non-overlapping output signals from the data driver;
- and
- sequentially controlling a signal level of the gate line according to the non-overlapping output signals from the data driver, wherein the signal level controlling step comprises the steps of
- bypassing a corresponding gate line signal according to a first one of the non-overlapping output signals;
- switching the corresponding gate line signal according to a second one of the non-overlapping output signals;
- producing a logical output signal according to the switched signal from the switching step;
- and
- producing a gate line signal of a next stage according to a third one of the non-overlapping output signals.
5 more elements
Dependencies are inferred from the claim text.