HIGH CONTRAST, GLASS-BASED, WRITEABLE/ERASABLE FRONT PROJECTION SCREENS

High contrast, glass-based, writeable/erasable front projection screens are provided. The screens include a transparent glass sheet which has a front surface and a back surface separated by a distance d. The back surface is in optical contact with a diffusing element. During use of the projection sc...

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Bibliographische Detailangaben
Hauptverfasser:	BROWN, Gordon Charles, GOLLIER, Jacques, RAVICHANDRAN, Vasudha, WEIDMAN, David Lee, GREGORSKI, Joan Deanna
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ACCESSORIES FOR WRITING OR DRAWING ACCESSORIES THEREFOR APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM ARTICLES FOR WRITING OR DRAWING UPON BUREAU ACCESSORIES CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM PERFORMING OPERATIONS PHOTOGRAPHY PHYSICS TRANSPORTING WRITING OR DRAWING IMPLEMENTS
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Beschreibung
Zusammenfassung:	High contrast, glass-based, writeable/erasable front projection screens are provided. The screens include a transparent glass sheet which has a front surface and a back surface separated by a distance d. The back surface is in optical contact with a diffusing element. During use of the projection screen, the glass sheet transmits image light from a projector to the diffusing element and the diffusing element reflects a portion of that light back through the glass sheet to a user. The screens have a user-facing surface that is a writable/erasable surface. In embodiments, the distance d is less than or equal to 0.2 millimeters, the whiteness W of the projection screen is less than or equal to 0.5, and/or the contrast C of the projection screen is at least 75%.