Method and apparatus for preventing residual image in liquid crystal display

A residual image prevention apparatus for a liquid crystal display, comprising:

• a liquid crystal module including a liquid crystal display panel for displaying a picture, the liquid crystal display panel including a plurality of signal lines;
• a signal line driving circuit for driving the plurality of signal lines;
• a timing controller for controlling a driving time of the signal line driving circuit and for applying a data signal;
• a liquid crystal module power supply for supplying driving voltages suitable for the liquid crystal display panel, the signal line driving circuit, and the timing controller;
• a backlight unit for providing light to the liquid crystal display panel;
• a ramp driver for applying a ramp driving voltage to the backlight unit;
• and
• a system part for driving and controlling the liquid crystal module,
• wherein the timing controller generates a white data signal when an off-time of the ramp voltage, applied to the ramp driver from the system part, is sensed and displays the white data signal on the liquid crystal display panel.

A liquid crystal display, comprising:

• a liquid crystal display panel;
• a backlight unit;
• an inverter for applying a ramp driving voltage to the backlight unit;
• a timing controller for applying a data signal to the liquid crystal display panel,
• wherein when the ramp driving voltage is not applied, the timing controller generates a white data signal displayable on the liquid crystal display panel.