Source driving circuit and liquid crystal display apparatus including the same

A liquid crystal display (LCD) apparatus including:

• a liquid crystal display panel that includes a plurality of gate lines and a plurality of data lines;
• a gate driver that drives the plurality of gate lines;
• and
• a source driver that drives the plurality of data lines, the source driver comprising:
• a source driver circuit that receives display data and generates a source driving voltage corresponding to the received display data;
• and
• a switching control unit that receives a plurality of control signals for selectively applying the source driving voltage and the intermediate source driving voltage to the plurality of data lines as a driving voltage and controls order of transition to final levels of a common electrode voltage and the driving voltage such that the driving voltage transits to the final level prior to the common electrode voltage when the driving voltage transits to a lowest grayscale reference voltage and the common electrode voltage transits to a high common voltage or when the driving voltage transits to a highest grayscale reference voltage and the common electrode voltage transits to a low common voltage, the common electrode voltage being applied to a common electrode terminal of a liquid crystal capacitor coupled to each of the plurality of data lines,
• wherein the switching control unit comprises:
• a panel type selector that outputs a panel select signal based on a data pattern bit of the display data and a panel type signal of the plurality of control signals;
• a first switching signal controller that controls a timing for applying the intermediate source driving voltage to the data lines based on the panel select signal and first and second control signals of the plurality of control signals;
• a second switching signal controller that controls a timing for applying the source driving voltage to the data lines based on the panel select signal and third and fourth control signals of the plurality of control signals;
• a first switch that selectively connects the intermediate source driving voltage to the data lines in response to an output signal of the first switching signal controller;
• and
• a second switch that selectively connects the source driving voltage to the data lines in response to an output signal of the first switching signal controller.

A method of driving data lines of a display, comprising:

• generating a source driving voltage corresponding to received display data;
• generating an intermediate source driving voltage;
• receiving a plurality of control signals for selectively applying the source driving voltage and the intermediate source driving as a driving voltage to a data line of the display;
• and
• controlling an order of a transition to final levels of a common electrode voltage, the source driving voltage and the intermediate source driving voltage such that the driving voltage transits to the final level prior to the common electrode voltage when the driving voltage transits to a lowest grayscale reference voltage and the common electrode voltage transits to a high common voltage or when the driving voltage transits to a highest grayscale reference voltage and the common electrode voltage transits to a low common voltage, the common electrode voltage being applied to a common electrode terminal of a liquid crystal capacitor coupled to the data line of the display,
• wherein the step of controlling an order of the transition comprises,
• outputting a panel select signal based on a data pattern bit of the display data and a panel type signal of the plurality of control signals;
• applying the intermediate source driving voltage to the data lines by a first switching based on the panel select signal and first and second control signals of the plurality of control signals;
• and
• applying the source driving voltage to the data lines by a second switching based on the panel select signal and third and fourth control signals of the plurality of control signals.