Method of driving a liquid crystal display panel and liquid crystal display device employing the same

A method of driving a liquid crystal display panel, the liquid crystal display panel comprising:

• a liquid crystal display pixel comprising a liquid crystal structure comprising a pixel electrode, a liquid crystal layer, and a common electrode;
• a switching transistor connected between the pixel electrode of the liquid crystal structure and a data-line;
• and a storage capacitor connected to the pixel electrode of the liquid crystal structure, the method comprising:
• calculating an accumulated driving time of the liquid crystal display panel by accumulating a driving time of the liquid crystal display panel;
• determining whether or not the accumulated driving time has reached first through (k)-th deterioration reference times, wherein k is an integer greater than or equal to 2;
• and
• when the accumulated driving time is determined to have sequentially reached the first through (k)-th deterioration reference times, sequentially changing a gate-off voltage applied to a gate terminal of the switching transistor and a common voltage applied to the common electrode.

A liquid crystal display device comprising:

• a liquid crystal display panel comprising:
• a liquid crystal display pixel comprising a liquid crystal structure comprising a pixel electrode, a liquid crystal layer, and a common electrode;
• a switching transistor connected between the pixel electrode of the liquid crystal structure and a data-line;
• and
• a storage capacitor connected to the pixel electrode of the liquid crystal structure;
• a backlight configured to provide light to the liquid crystal display panel;
• a backlight driver configured to drive the backlight;
• and
• a liquid crystal display panel driver configured to drive the liquid crystal display panel,
• wherein the liquid crystal display panel driver is configured to calculate an accumulated driving time of the liquid crystal display panel by accumulating a driving time of the liquid crystal display panel and to reduce a gate-off voltage applied to a gate terminal of the switching transistor and a common voltage applied to the common electrode when the accumulated driving time reaches a deterioration reference time, and
• wherein the liquid crystal display panel driver is configured to not change a gate-on voltage applied to the gate terminal of the switching transistor.

A liquid crystal display device comprising:

• a liquid crystal display panel comprising:
• a liquid crystal display pixel comprising a liquid crystal structure comprising a pixel electrode, a liquid crystal layer, and a common electrode;
• a switching transistor connected between the pixel electrode of the liquid crystal structure and a data-line;
• and
• a storage capacitor connected to the pixel electrode of the liquid crystal structure;
• a backlight configured to provide light to the liquid crystal display panel;
• a backlight driver configured to drive the backlight;
• and
• a liquid crystal display panel driver configured to drive the liquid crystal display panel,
• wherein the liquid crystal display panel driver is configured to calculate an accumulated driving time of the liquid crystal display panel by accumulating a driving time of the liquid crystal display panel and to sequentially reduce a gate-off voltage applied to a gate terminal of the switching transistor and a common voltage applied to the common electrode of the liquid crystal structure when the accumulated driving time sequentially reaches first through (k)-th deterioration reference times, wherein k is an integer greater than or equal to 2, and
• wherein the liquid crystal display panel driver is configured to not change a gate-on voltage applied to the gate terminal of the switching transistor.