IMAGING PREVENTION DEVICE, IMAGING PREVENTION METHOD AND IMAGE DISPLAY SYSTEM

摘要

The disclosed image display system deteriorates the image quality of illicitly recorded images by means of emitting non-visible light in addition to the display image from an image display unit of a screen, thus rendering the illicitly recorded image contents unusable. The image display system (1) is provided with a projector (202) for generating display images, and a screen (203) on which the images generated by the projector (202) are projected and displayed. Behind the screen (203), an infrared light emitter unit (204) is provided which emits infrared light from the image display surface while images are being displayed on the screen (203). The infrared light emitter unit (204) has a wavelength cut filter which essentially does not pass a prescribed wavelength component close to the visible region of the light emitted from the infrared light source.