Patent ID: 8587731

Claim:
A projection display device which projects an image, comprising: a signal input section that receives an image signal and a caption signal; a controller that determines a trapezoidal distortion correction amount, including a horizontal compression rate for each vertical position in the image signal and a vertical compression rate for each horizontal position in the image signal, that corrects a trapezoidal distortion of the image that is projected; a correction section that corrects said image signal for distortion based on said trapezoidal distortion correction amount determined by said controller; a processor that adjusts a size of a display area of said caption signal based on said trapezoidal distortion correction amount determined by said controller in such a manner that an entire caption indicated by said caption signal is displayed and determines a maximum number of characters successfully placed inside said adjusted display area per caption line, and if a number of characters in said caption is more than said maximum number, said processor adjusts said caption signal such that said number of characters displayed per caption line is equal to or less than said maximum number; a synthesizer that synthesizes said caption signal with said display content thereof adjusted by said processor, with said image signal corrected by said correction section; and a projection section that projects an image corresponding to said image signal synthesized by said synthesizer.