IMAGING PREVENTION DEVICE, IMAGING PREVENTION METHOD AND IMAGE DISPLAY SYSTEM

摘要

Light other than visible light is emitted from a video image display section such as a screen, together with display images, so as to degrade image quality of illegally camcorded video images, thereby making it impossible to use the illegally camcorded image contents. A video image display system (1) includes a projector (202) that generates a display image; and a screen (203) on which the image generated by the projector (202) is projected and displayed. On a backside of the screen (203), there is provided an infrared ray emitting unit (204) that emits infrared light from a video image display surface during a period while video images are being displayed on the screen (203). The infrared ray emitting unit (204) includes a wavelength cut filter that substantially does not transmit a predetermined wavelength component close to a visible light region, among the light emitted from the infrared light source.