Active level shift (ALS) driver circuit, liquid crystal display device comprising the ALS driver circuit and method of driving the liquid crystal display device
AssigneeSamsung Display Co., Ltd.
InventorsSeung-Kyu Lee, Dong-Hoon Lee, Chul-Ho Kim
Life of this patent
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Abstract
An active level shift (ALS) driver circuit, a liquid crystal display device including the ALS driver circuit, and a method of driving the liquid crystal display device. A liquid crystal display device having a slim external black matrix may be provided by fabricating the ALS driver circuit using inverters and a transmission gate.
Claims17
An active level shift (ALS) driver circuit comprising:
- a first inverter receiving and inverting a gate signal to output a first inverted signal;
- a second inverter receiving and inverting the first inverted signal to output a second inverted signal;
- a third inverter receiving and inverting the second inverted signal to output a third inverted signal;
- a transmission gate receiving the second inverted signal at a first control terminal and receiving the third inverted signal at a second control terminal, the transmission gate being turned on when the third inverted signal is at a low level and being turned off when the third inverted signal is at a high level, the transmission gate outputting a first power signal to an output terminal of the active level shift (ALS) driver circuit when turned on;
- and
- a transistor receiving the third inverted signal, the transistor being turned on when the third inverted signal is at a high level to output a second power signal to the output terminal of the active level shift (ALS) driver circuit.
A liquid crystal display device comprising:
- a liquid crystal panel comprising a plurality of pixel regions formed at intersections between a plurality of data lines and a plurality of gate lines;
- a data driver connected to the plurality of data lines, the data driver applying respective data signals to the data lines;
- a gate driver connected to the plurality of gate lines, the gate driver sequentially applying respective gate signals to the gate lines;
- and
- an active level shift (ALS) driver having a plurality of outputs connected to a plurality of ALS lines disposed to be parallel to corresponding ones of the gate lines, the active level shift (ALS) driver outputting an alternating current (AC) voltage signal when a corresponding gate signal has a first voltage level and outputting a direct current (DC) voltage signal when the corresponding gate signal has a second voltage level.
A method of driving a liquid crystal display device comprising a plurality of pixel regions formed at intersections between a plurality of data lines and a plurality of gate lines, the method comprising:
- applying corresponding gate signals to the gate lines;
- turning on a switching device of respective corresponding ones of the pixel regions when the corresponding gate signal has a first predetermined level;
- applying a data signal to the pixel region from the data line via the turned on switching device;
- providing an alternating current (AC) voltage signal to corresponding ones of the pixel regions via a corresponding one of a plurality of ALS lines disposed to be parallel to the gate lines, when a voltage level of the gate signal has said first predetermined level;
- and
- providing a direct current (DC) voltage signal to corresponding ones of the pixel regions via the corresponding one of a plurality of ALS lines, when a voltage level of the gate signal has second predetermined level.
Dependencies are inferred from the claim text.