Display apparatus and method for controlling a backlight with multiple light sources of a display unit

A display method for use in a display apparatus, the display apparatus including a display unit having a display screen divided into a plurality of regions, each region having a plurality of pixels, each pixel having a transmittance ratio, the display unit being controlled using the transmittance ratio of each pixel on a pixel-by-pixel basis, and a backlight for illuminating the back surface of the display unit, the backlight including a plurality of sets of light sources, each set being disposed so as to correspond to one of the regions, the method comprising the steps of:

• identifying the display luminance in each region of the display unit when an image is displayed on the display unit on the basis of an input image signal;
• computing the emission luminance of each light source disposed so as to correspond to one of the divided regions based on the identified display luminance and predetermined data stored in memory regarding an effect on the region of the other light sources not corresponding to the region;
• independently setting the emission luminance of each light source to the computed emission luminance for each light source;
• computing a correction value for each pixel of the display unit on the basis of a shift amount between the set emission luminance and an optimal display luminance value for one of the divided regions of the display screen;
• and
• delivering a display driving signal generated on the basis of the computed correction value to each pixel so as to control the luminance of the pixel.