Patent ID: 7914154

Claim:
An image projector comprising a first light source that emits visible light and a second light source that emits invisible light and projecting the visible light and the invisible light onto a screen, wherein the screen includes a material, at least one of the visible light reflectance, transmittance and absorbance of which changes when irradiated with the invisible light projected, and wherein the image projector further includes: a modulating section for modulating the intensities of the visible light and invisible light based on an image signal; and a control section for controlling the modulating section, and wherein the control section includes a visible light source control section and an invisible light source control section, and wherein the invisible light source control section includes a correcting section for correcting an inverted luminance signal, which is obtained by inverting a luminance signal associated with the image signal, and wherein the correcting section makes at least one correction selected from the group consisting of: a correction to the luminance level of the inverted luminance signal; the correction of truncating portions of the inverted luminance signal that have a predetermined luminance level or less; and the correction of truncating portions of the inverted luminance signal that have predetermined intermediate luminance levels.