Patent ID: 8576159

Claim:
A driving method for local dimming of a Liquid Crystal Display (LCD) device, comprising: measuring light intensities at a plurality of sampling points by driving a light source of a backlight unit, generating light intensity data of the sampling points as an optical profile for the light source by normalizing the light intensity measurements, and storing the light intensity data of the sampling points in a memory; determining a local dimming value of each block by analyzing input image data on a block basis; detecting a pixel position of current input data; selecting a plurality of sampling points adjacent to the current pixel and the light intensity data of the selected sampling points from the memory; obtaining light intensity data of the current pixel by linearly interpolating the light intensity data of the selected sampling points individually; calculating first and second total intensities of light that reach the current pixel using the light intensity data of the current pixel and the local dimming value of each block, and calculating a ratio between the first and second total light intensities as a gain value; compensating the current input data using the gain value; and controlling luminance of the backlight unit on a block basis using the local dimming value of each block.