Method of controlling backlight device and display apparatus using the same

摘要

In a display apparatus, a display panel is divided into dimming areas and a backlight device includes light source blocks providing light to the dimming areas. Average gray-scale values and maximum gray-scale values respectively corresponding to the dimming areas are generated based on image signals provided to the dimming areas. Whether the average gray-scale values and the maximum gray-scale values are respectively within first and second reference ranges are checked. One of at least two parameters is selected according to a checked result, and representative brightness values respectively corresponding to the dimming areas are determined using the selected parameter. Duty ratios of the light source blocks are controlled based on the representative brightness values. As a result, power consumption is reduced when applying a dimming device to the display apparatus.

主权项

1. A method of controlling a backlight device comprising a plurality of light source blocks respectively corresponding to a plurality of dimming areas of a display panel, the method comprising:
outputting average gray-scale values and maximum gray-scale values for the respective dimming areas based on image signals provided to the display panel; outputting result signals determining whether the average gray-scale values are within a first reference range and whether the maximum gray-scale values are within a second reference range; outputting representative brightness values for the respective dimming areas based on one selected from predetermined two or more parameters, wherein the selected parameter is based on the result signals; and determining duty ratios of the respective light source blocks based on the representative brightness values, wherein the first reference range is determined based on an average value of the average gray-scale values, and the second reference range is determined based on an average value of the maximum gray-scale values.