Display apparatus with scanning backlight

摘要

Display apparatus comprising an image-generating screen ( 46 ) repetitively scanned at a predetermined rate to display images, and a backlight for illuminating the screen. The backlight includes a light guide ( 10 ) arranged to constrain light by total internal reflection, the light guide having an output surface ( 22 ) with various locations from which light may be selectively coupled using a scanning arrangement ( 44 ). The scanning arrangement sequentially and repeatedly illuminates selected areas of said screen in synchronism with the repetitive scanning of the screen.