Patent Issued for Active Level Shift (ALS) Driver Circuit, Liquid Crystal Display Device Comprising the ALS Driver Circuit and Method of Driving the Liquid Crystal Display Device
The assignee for this patent, patent number 8508519, is
Reporters obtained the following quote from the background information supplied by the inventors: "The present invention relates to a liquid crystal display (LCD) device, and more particularly, to an active level shift (ALS) driver circuit capable of reducing the width of an external black matrix, a LCD device including the ALS driver circuit, and a method of driving the LCD device.
"A liquid crystal display (LCD) device is light weight, thin, and driven with low power consumption, and thus is widely used as a display device, such as a laptop or a portable television (TV).
"The LCD device includes a gate driver and an active level shift (ALS) driver, and displays an image by adjusting light transmittance according to a signal applied to a plurality of control switches aligned in a matrix from the gate driver and the ALS driver.
"The ALS driver uses two direct current (DC) voltages to generate an ALS voltage. The ALS driver maintains a previous ALS voltage while writing the LCD device by a gate-ON voltage and changes the ALS voltage by a gate-OFF voltage. Since the ALS driver includes a latch circuit to maintain the previous ALS voltage, a clock generator is required, thereby increasing the size of the ALS driver circuit.
"As an external black matrix BM of the LCD device has been slimmed, the internal circuit of the ALS driver needs to be simplified."
In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventors' summary information for this patent: "The present invention provides a simplified active level shift (ALS) driver circuit by which an external black matrix is slimmed, a liquid crystal display device including the ALS driver circuit, and a method of driving the liquid crystal display device.
"According to an aspect of the present invention, there is provided an active level shift (ALS) driver circuit including: a first inverter that receives and inverts a gate signal and outputs the inverted signal; a second inverter that receives and inverts the output signal from the first inverter and outputs the inverted signal; a third inverter that receives and inverts the output signal from the second inverter and outputs the inverted signal; a transmission gate that receives the output signals from the second inverter and third inverter as control signals and is turned on when the output signal from the third inverter is at a low level to output a first power signal; and a transistor that receives the output signal from the third inverter and is turned on when the output signal from the third inverter is at a high level to output a second power signal.
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