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tv monitor or video compact of the type a retroprojection
tv monitor or video compact of the type a retroprojection
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机译：电视投影机或视频投影机
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摘要
In such a television or video monitor, a lamp (10) forms an image on a display screen (14) by backlighting after reflection on a reflecting mirror (12). According to the invention, it is provided, in the immediate vicinity of the display screen and parallel to that - latter, a screen réflexo - transmissive (16) comprising a fresnel boldness with grooves of triangular cross-section, these grooves forming locally prisms and being able to reflect the rays that strike them when the angle of incidence of the spokes is greater than a predetermined value, and to pass through the rays in the opposite case, the headlight, the screen réflexo - transmissive and the mirror being configured to each other so as to form an optical system such as the screen réflexo - transmissive reflects the rays (18) directly from the headlight in the direction of the mirror and allows these rays (24), after reflection on the mirror.
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