Patent ID: 8223115

Claim:
A liquid crystal display (LCD) device, comprising: a plurality of gate lines and a plurality of data lines forming a matrix; a back light unit including a plurality of light source blocks capable of being driven separately; an image processing circuit to generate a movement judgment signal based on a digital video data to be displayed in an interior mode; a backlight controller to generate a light source driving control signal to control portions of the light source blocks corresponding to a moving image and portions of the light source blocks corresponding to a still image, separately, based on the movement judgment signal; and a backlight driving circuit including a plurality of light source drivers to turn on the portions of the light source blocks corresponding to a moving image and to turn off the portions of the light source blocks corresponding to a still image based on the light source driving control signal, wherein the moving image and the still image are included in a same frame, wherein: the image processing circuit comprises a movement detector to detect movement of two consecutive frames of digital video data and to generate the movement judgment signal; the movement judgment signal has a first logic level for the moving image and a second logic level different from the first logic level for the still image, and a multiplexer to output the digital video data as is for portions of the digital video data corresponding to the moving image and outputting black data for portions of the digital video data corresponding to the still image based on the movement judgment signal, wherein the movement detector includes: first and second frame memories to store two consecutive frames of digital video data, respectively, and a comparator to compare the two consecutive frames stored in the first and second frame memories and to generate the movement judgment signal, and wherein the movement detector further includes a logic gate that is connected to the comparator to generate a selection signal for controlling the multiplexer to selectively output the digital video data and the black data.