Patent ID: 8237755

Claim:
An apparatus for driving a liquid crystal display device, comprising: a liquid crystal panel having quad type unit pixels each including red, green and blue (RGB) sub-pixels and an electrical controlled birefringence (ECB) sub-pixel; a data driver for driving data lines of the liquid crystal panel; a gate driver for driving gate lines of the liquid crystal panel; and a timing controller for generating ECB data based on externally inputted RGB video data such that each of the unit pixels maintains a brightness at a constant level to form a narrow viewing angle, arranging the generated ECB data together with the externally inputted RGB video data and supplying the arranged data to the data driver, wherein the ECB data is set such that an RGB+ECB brightness displayed through each of the unit pixels is repetitively swung with a width preset by a user while being maintained at the constant level, wherein only the ECB data is set such that the brightness displayed through the ECB sub-pixel is repetitively swung within a brightness range preset by the user, so that an RGB+ECB brightness is repetitively swung within a brightness range preset.