Device and method for driving liquid crystal display device

摘要

A device and method for driving a liquid crystal display device, which is capable of improving image quality and reducing power consumption by varying a light emission region of a backlight unit according to brightness characteristics of a display image, is disclosed. The driving device includes a liquid crystal panel, panel drivers, a timing controller for generating control signals to control the panel drivers, analyzing a brightness distribution of externally input image data to set the number of divisional driving regions of a backlight, and generating a dimming control signal to control the brightness of each of the divisional driving regions, and a backlight unit for divisionally setting the driving regions of the backlight according to the number of divisional driving regions and the dimming control signal and driving the driving regions according to the dimming control signal to irradiate light to the liquid crystal panel.

主权项

1. A device for driving a liquid crystal display device, the device comprising:
a liquid crystal panel including a plurality of pixel regions and configured to display an image; a plurality of panel drivers configured to drive the liquid crystal panel; a timing controller configured to generate control signals so as to control the plurality of panel drivers, to analyze a brightness distribution of externally input image data so as to set a size and number of N×M (where N and M are integers which are equal to or different from each other) divisional driving regions of a backlight to dynamically control a brightness of the divisional driving regions, and to generate a dimming control signal to uniformly control the brightness of each of the divisional driving regions; and a backlight unit configured to divisionally set the driving regions of the backlight according to the size and number of N×M divisional driving regions and the dimming control signal and to control on/off times of the N×M divisional driving regions according to the dimming control signal so as to irradiate light to the liquid crystal panel, wherein the timing controller includes an image processing unit configured to accumulate and analyze the brightness distribution of image data using an internal or external memory in units of at least one frame, to set the size and number of the N×M divisional driving regions of the backlight according to the distribution of a high grayscale level, an intermediate grayscale level and a low grayscale level, and generate divisional driving region information, and to generate the dimming control signal according to an accumulated grayscale level of each of the set N×M divisional driving regions, wherein the size and number of the N×M divisional driving regions to dynamically control the brightness of the divisional driving regions is changed according to the brightness distribution of the units of at least one frame, and a number of the dimming control signal is also changed same as the changed number of divisional driving regions, wherein when an area of a region having one of the high grayscale level and low grayscale level is densely distributed, then the number of N×M divisional driving regions is decreased and a size of the densely distributed area is large in a portion of the LCD panel such that the portion has uniform brightness, and wherein when the image data having the intermediate grayscale level, high grayscale level or low grayscale level is uniformly distributed, then the number of N×M divisional driving regions is increased and brightness is uniformly distributed in the entire region.