Method and apparatus for selectively viewing captioning

An apparatus for projecting onto a screen means viewable by a plurality of persons a display including alphanumeric images which can be viewed only by selected persons, the apparatus comprising:

• first laser means emitting a first polarized beam at a first visible wavelength,
• second laser means emitting a second polarized beam at a second visible wavelength,
• one of said first and second polarized beam forming alphanumeric images, and said first and second visible wavelengths being sufficiently close that a color difference therebetween cannot be distinguished by the unaided eye,
• polarizing beam splitting means for combining said first and second beams, the combined beams being emitted in the same direction with orthogonal polarization orientation,
• liquid crystal display means for displaying a selected alphanumeric image having a first surface for receiving said combined beams and a second surface provided with a polarizing means for outputting only vertically polarized light, and
• lens means for projecting said light passed through said second surface onto the screen means,
• wherein the alphanumeric images can be seen only by selected persons wearing a wavelength selective filter adjacent the eyes.