Image projector

H - Electricity – 04 – N

Patent

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Details

H04N 9/31 (2006.01) G09B 9/32 (2006.01) H04N 5/74 (2006.01)

Patent

CA 2371218

The invention relates to an image projector with at least one projection beam that is controlled in raster mode and in calligraphic mode, for displaying a raster part and a calligraphic part of a total image that is projected onto a display. The aim of the invention is to achieve greater brightness and contrast for projection in non-darkened rooms. To this end, the at least one projection beam is a laser beam (19) that is divided into two linearly polarised partial beams (21, 21'). The two partial beams (21, 21') are separately modulated and deflected in such a way that one partial beam (21') determines the raster part and the other partial beam determines the calligraphic part. The two partial beams (21, 21') are projected onto the display at the same time. They may be optically superposed beforehand.

L'invention concerne un projecteur d'image comprenant au moins un faisceau de projection commandé en mode balayage et en mode calligraphique pour représenter une partie en mode balayage et une partie en mode calligraphique d'une image globale projetée sur un écran. L'invention vise à permettre l'obtention d'une plus grande luminosité et d'un plus grand contraste d'image lors de la projection dans des locaux non obscurcis. A cet effet, le ou les faisceaux de projection sont constitués par un rayon laser (19) divisé en deux rayons partiels (21, 21') polarisés de manière linéaire, ces derniers étant soumis à une modulation et à une déviation séparées de sorte qu'un rayon partiel (21') produit la partie en mode balayage et l'autre rayon partiel la partie en mode calligraphique. Ces deux rayons partiels (21, 21') sont projetés simultanément sur l'écran, une superposition optique des deux rayons partiels pouvant être effectuée auparavant.

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