Patent ID: 7857466

Claim:
A projection-type image display device having a solid light source and a light valve, configured to cause light emitted from the solid light source to perform scanning on the light valve along a predetermined scanning line, the projection-type image display device comprising: a modulation amount controller configured to control a modulation amount of the light valve according to an input video signal, the input video signal is a video signal inputted to the projection-type image display device; an output controller configured to determine a reference output according to the input video signal and to control an output of the solid light source according to the reference output; an integrator configured to integrate the input video signal to calculate an integrated value corresponding to the predetermined scanning line; and a calculator configured to calculate a luminance improving coefficient based on the integrated value calculated by the integrator; the luminance improving coefficient is to be multiplied by the reference output, wherein the output controller controls the output of the solid light source according to a value obtained by multiplying the reference output by the luminance improving coefficient.