Patent ID: 8736535

Claim:
A hold type image display system for displaying a video on a display panel by controlling a video signal to be input to a source line and a gate line of the display panel, the hold type image display system comprising; a source driver for outputting a video signal to the source line; a gate driver for outputting a scanning signal to the gate line; a controller for receiving an input video signal and thereby controlling the source driver and the gate driver; and a backlight on a rear surface of the display panel, wherein the gate driver is configured by two or more gate drivers for collectively enabling a gate output for every gate line group; the controller independently controls an output enable signal to be input to the respective gate driver, outputs a video signal in which a black or gray line is inserted between video lines to the source driver, outputs a start pulse single for writing the video lines for one or more times and a start pulse signal for writing black or gray lines for one or more times to the gate driver within one frame period, and scrolls a black band in a screen of the display panel during one frame; the controller determines a black or gray insertion rate according to a display, and changes a timing of input of the start pulse signal to the gate driver to write the black or gray lines with respect to input of the start pulse signal to the gate driver to write the video lines based on the determined black or gray insertion rate; the controller compares preceding and following video signals in one frame unit to switch a black image insertion rate; and adjusts the light control luminance of the backlight so that the change in luminance due to switching of the black image insertion rate can be prevented; the controller divides one frame into a plurality of blocks set in advance, calculates a distance an image of an arbitrary block moves from a previous frame to a current frame, and continuously switches the black image insertion rate according to a maximum value of the calculated movement distance of each block to adjust a light control luminance of the backlight; and the controller compares the preceding and following video signals in one frame unit to determine whether the image is a static image or a dynamic image, and if a determination result suggests static image, black insertion is not performed and the light control luminance of the backlight is set to 50%, whereas if the determination result suggests dynamic image, the black insertion rate is switched to 50% and the light control luminance of the backlight is switched to 100%.