Patent ID: 8690350
Filing Date: 2014-04-08
Classification: H04N

Abstract:
1. An image display apparatus projecting a screen image on a screen, the image display apparatus comprising: a projection unit capable of changing a projection angle; a projection angle detector detecting the projection angle of the projection unit; and a screen image corrector correcting trapezoidal distortion of a screen image according to the projection angle detected by the projection angle detector, wherein the screen image corrector changes a direction of trapezoidal distortion correction based on the projection angle, wherein the screen image corrector determines whether a projection mode is projection upward to a wall or projection to a ceiling based on the projection angle and changes the direction of trapezoidal distortion correction for the projection upward to the wall and the projection to the ceiling, and wherein the screen image corrector determines that the projection mode is the projection upward to the wall when the projection angle is less than a predetermined value and that the projection mode is the projection to the ceiling when the projection angle is the predetermined value or greater.