Video display apparatus
View Patent ↗According to one embodiment, a video display apparatus includes a liquid crystal panel configured to display a video on a display area and light sources, each configured to be controlled respectively and to light in an illumination area into which the display area is virtually divided according as arrangement of the light sources. The apparatus includes a first calculation unit configured to calculate a second emission intensity corresponding to a small-area based on a video signal in a small-area, wherein the small-area is segmented area of the display area and smaller than the illumination area. The apparatus includes a second calculation unit configured to calculate a first emission intensity to control the light source from the second emission intensities and a control unit configured to light the light sources at the first emission intensities.
1. A video display apparatus comprising:
a liquid crystal panel configured to display a video on a display area including pixels;
light sources, each configured to be controlled respectively and to light in an illumination area into which the display area is virtually segmented according to an arrangement of the light sources;
a first calculation unit configured to calculate a second emission intensity corresponding to a small-area based on a video signal to be displayed in the small-area, wherein the small-area is a segment of the display area, a segmentation of the display area to obtain the small-area being finer than a segmentation of the display area to obtain the illumination area and being coarser than a segmentation of the display area to obtain the pixels;
a second calculation unit configured to calculate a first emission intensity, to control the light source, based on the second emission intensity; and
a control unit configured to control the light source in accordance with the first emission intensity.
2. The apparatus according to claim 1 , wherein the second calculation unit uses weight coefficients provided based on a positional relationship to calculate the first emission intensity from a weighted average of the second emission intensity.
3. The apparatus according to claim 2 , wherein for each small-area the weight coefficient decreases with increasing spatial distance from a center of the illumination area.
4. The apparatus according to claim 3 , wherein the first calculation unit calculates the second emission intensity based on a maximum video signal value contained in a calculation area corresponding to the small-areas.
5. The apparatus according to claim 3 , wherein the first calculation unit calculates the second emission intensity based on a center value between a maximum value and a minimum value of lightness in video signals contained in a calculation area corresponding to the small-areas.
6. The apparatus according to claim 3 , wherein the first calculation unit calculates the second emission intensity based on an average value of luminance in video signals contained in a calculation area corresponding to the small-areas.