Patent ID: 8964124
Filing Date: 2015-02-24
Classification: G09G,H04N

Abstract:
1. A video display device comprising: a display portion for displaying an input video signal; a light source for illuminating the display portion; and a control portion for controlling the display portion and the light source, wherein the control portion detects a light-emitting part of the input video signal based on a luminance value of the input video signal or other feature quantity, and stretches a video signal of the light-emitting part to display on the display portion, the control portion detects a light-emitting part which is predetermined according to a histogram, based on a luminance histogram for each frame of the input video signal, and as to the input video signal of a prescribed range including the detected light-emitting part, detects a predetermined light emission quantity according to a score obtained by counting the number of pixels with a weight given to luminance for each pixel to stretch the luminance of the light source according to the detected light emission quantity, the control portion regards a pixel which is greater than or equal to: as the light-emitting part, where an average value of the luminance histogram is A and a standard deviation is σ.