Patent ID: 9210389
Filing Date: 2015-12-08
Classification: H04N

Abstract:
1. A projection-type image display apparatus that controls an amount of light emitted from a light source with a diaphragm mechanism and projects a video image output from a projection lens onto a screen, the apparatus comprising, a controller configured to control the diaphragm mechanism, wherein the controller includes: a video-image analyzer configured to analyze a picture signal; a setting unit configured to set a diaphragm stop of the diaphragm mechanism, a color balance correction value, and a lightness correction value according to analysis data analyzed in the video-image analyzer; a black period controller configured to set a black period in the picture signal according to a predetermined black time length; a diaphragm driver configured to output a drive signal to the diaphragm mechanism such that the diaphragm stop has a first state and a second state in one frame, wherein a video-image processor configured to correct color balance and lightness of the picture signal using the color balance correction value and the lightness correction value set by the setting unit.