Liquid crystal display device and method for driving thereof

A liquid crystal display device comprising:

• a liquid crystal display panel formed with a plurality of data lines and a plurality of gate lines, the liquid crystal display panel having a plurality of liquid crystal cells;
• an image determiner for analyzing input digital video data and determining whether one of interlaced data and scrolled data has been input based on results of the analysis;
• a frame rate adjusting circuit for controlling a frame rate such that the frame rate is maintained at a 1-fold rate in frame periods other than an Nth frame period, where “N” is a multiple of 8 or more, while being increased to an “i”-fold-accelerated rate in the Nth frame period, where “i” is a positive integer of 2 or more, upon a determination that one of interlaced data and scrolled data has been input, and to output reference timing signals in the frame periods other than the Nth frame period, and to output accelerated timing signals in the Nth frame period;
• a timing controller for generating data timing control signals and gate timing control signals, based on the reference timing signals upon a determination that one of interlaced data and scrolled data has been input, and for generating the data timing control signals and the gate timing control signals based on the accelerated timing signals upon a determination that data other than interlaced data and scrolled data has been input;
• a logic circuit for accelerating a frequency of a polarity control signal to determine a polarity of a data voltage to be supplied to the liquid crystal cells, in the Nth frame period, when one of the interlace data and the scroll data has been input, the polarity control signal being included in the data timing control signals;
• a data driving circuit for generating the data voltage in response to the data timing control signals including the polarity control signal;
• and
• a gate driving circuit for supplying a scan pulse to the gate lines in response to the gate timing control signals,
• wherein the logic circuit comprises a frame counter for counting a gate start pulse indicating a start of the scan pulse to count a number of frames,
• an inverter for generating an inverting signal indicating a point of time when the polarity control signal is inverted in phase in the Nth frame period, in accordance with an output from the frame counter,
• an exclusive OR gate for exclusively ORing a reference polarity control signal generated from the timing controller and the inverting signal, to generate the polarity control signal, and
• a multiplexer for outputing a selected one of the reference polarity control signal and the polarity control signal.

A method for driving a liquid crystal display device including a liquid crystal display panel formed with a plurality of data lines and a plurality of gate lines, the liquid crystal display panel having a plurality of liquid crystal cells, the method comprising:

• controlling a frame rate such that the frame rate is maintained at a 1-fold rate in frame periods other than an Nth frame period, where “N” is a multiple of 8 or more, while being increased to an “i”-fold-accelerated rate, in the Nth frame period, where “i” is a positive integer of 2 or more, to output reference timing signals in the frame periods other than the Nth frame period, and to output accelerated timing signals in the Nth frame period;
• generating data timing control signals and gate timing control signals, based on at least one of each reference timing signal and each accelerated timing signal;
• accelerating a frequency of a polarity control signal to determine a polarity of a data voltage to be supplied to the liquid crystal cells, in the Nth frame period, the polarity control signal being included in the data timing control signals;
• generating the data voltage in response to the data timing control signals including the polarity control signal;
• and
• supplying a scan pulse to the gate lines in response to the gate timing control signals,
• wherein the accelerating the frequency of a polarity control signal comprises counting a gate start pulse indicating a start of the scan pulse to count a number of frames,
• generating an inverting signal indicating a point of time when the polarity control signal is inverted in phase in the Nth frame period, in accordance with an output from the frame counter,
• exclusively ORing a reference polarity control signal generated from the timing controller and the inverting signal, to generate the polarity control signal;
• and
• outputing a selected one of the reference polarity control signal and the polarity control signal.

A method for driving a liquid crystal display device including a liquid crystal display panel formed with a plurality of data lines and a plurality of gate lines, the liquid crystal display panel having a plurality of liquid crystal cells, the method comprising:

• analyzing input digital video data and determining whether one of interlaced data and scrolled data has been input based on results of the analysis;
• controlling a frame rate such that the frame rate is maintained at a 1-fold rate in frame periods other than an Nth frame period, where “N” is a multiple of 8 or more, while being increased to an “i”-fold-accelerated rate in the Nth frame period, where“i” is a positive integer of 2 or more, upon a determination that one of interlaced data and scrolled data has been input, to output reference timing signals in the frame periods other than the Nth frame period, and to output accelerated timing signals in the Nth frame period;
• generating data timing control signals and gate timing control signals, based on the reference timing signals upon the determination that one of interlaced data and scrolled data has been input;
• generating the data timing control signals and the gate timing control signals, based on the accelerated timing signals, upon a determination that data other than one of interlaced data and scrolled data has been been input;
• accelerating a frequency of a polarity control signal to determine a polarity of a data voltage to be supplied to the liquid crystal cells, in the Nth frame period upon a determination that one of interlaced data and scrolled data has been input, the polarity control signal being included in the data timing control signals;
• generating the data voltage in response to the data timing control signals including the polarity control signal;
• and
• supplying a scan pulse to the gate lines in response to the gate timing control signals,
• wherein the accelerating the frequency of a polarity control signal comprises counting a gate start pulse indicating a start of the scan pulse to count a number of frames,
• generating an inverting signal indicating a point of time when the polarity control signal is inverted in phase in the Nth frame period, in accordance with an output from the frame counter,
• exclusively ORing a reference polarity control signal generated from the timing controller and the inverting signal, to generate the polarity control signal;
• and
• outputing a selected one of the reference polarity control signal and the polarity control signal.