Patent ID: 9305495
Filing Date: 2016-04-05
CPC Classification: G09G

Claim Text:
1. A display device, comprising: a display panel which has pixels is virtually divided into divided regions including a first divided region and a second divided region that are mutually adjacent in a predetermined adjacent direction, and displays an image corresponding to an input image signal; a backlight portion which has light source portions that are respectively arranged corresponding to the divided regions and emit light with a predetermined luminance distribution to illuminate the display panel from a rear surface thereof; a determination portion which determines emission luminance for each of the divided regions, in response to the image signal; a backlight driver which drives the light source portions so as to emit light at the emission luminance determined for each of the divided regions by the determination portion; a storage which stores a division number N where N is a positive integer, the division number N being set in advance on the basis of the luminance distribution of the light source portions; a dividing portion which divides the divided regions to respectively generate sub-regions of a number equal to the division number N; a setting portion which sets the emission luminance of the generated sub-regions to a value equal to the emission luminance of the divided region which contains the sub-regions; a linear interpolation portion which performs linear interpolation in pixel units using emission luminance of a first sub-region and emission luminance of a second sub-region, to calculate, for each of the pixels, an estimated value of the emission luminance distribution of the backlight portion in a region from the first sub-region to the second sub-region, the first sub-region being a sub-region, of the first divided region, which is adjacent to a boundary between the first divided region and the second divided region, the second sub-region being a sub-region, of the second divided region, which is adjacent to the first sub-region; a signal correction portion which corrects the image signal, for each of the pixels, on the basis of the estimated value calculated by the linear interpolation portion, to generate drive signals for the pixels of the display panel; an adjustment portion which adjusts the division number to generate an adjusted division number; and a panel driver which drives the pixels of the display panel in response to the drive signals generated by the signal correction portion, wherein the light source portions emit light with the predetermined luminance distribution identical to each other, the divided regions further includes a third divided region which is adjacent to the first divided region on an opposite side to the second divided region in the adjacent direction, the adjustment portion generates the adjusted division number in accordance with a size relationship between the emission luminance of the first divided region determined by the determination portion, and the emission luminance of the second and third divided regions determined by the determination portion, the dividing portion divides the first divided region to generate the sub-regions of a number equal to the adjusted division number, and the setting portion sets the emission luminance of the generated sub-regions to a value equal to the emission luminance of the first divided region.