Talaria projector

Taleria was the brand name of a large-venue video projector from General Electric.

Light from a Xenon arc lamp was modulated by a light valve consisting of a rotating glass disc that was continuously coated with a viscous oil. An electron beam similar to the one in a cathode ray tube traced a raster on the glass, deforming the surface of the oil. Where the oil was undisturbed, the light would reflect into a trap. Where the surface of the oil was deflected, the light from the xenon lamp would pass through the glass, to a lens and onto the screen.

In early models, the light source was a 1600 watt xenon bulb similar to the units in modern 35mm film projectors, and produced 1800 lumens at a 250:1 contrast ratio.cite web | title = GE Lightvalve 12K | publisher = hi-def.com | url = http://www.hi-def.com/12K.html | accessdate = 2008-08-22 ] Later versions produced as much as 3500 lumens.cite web | title = DISPLAY TECHNOLOGIES IN JAPAN | publisher = wtec.org | url = http://www.wtec.org/loyola/dsply_jp/c6_s3.htm | accessdate = 2008-08-22 ]

The basic unit is monochrome. Color display is accomplished in one of two ways:

# A color wheel divided into red, green and blue sections between the light source and the light valve and the colors are displayed sequentially.
# Three units are stacked one atop the other, each one devoted to a single color.cite web | title = Television Technical Theory: Unplugged | publisher = danalee.ca | url = http://www.danalee.ca/ttt/monitors_and_television_sets.htm | accessdate = 2008-08-22 ]

See also

* Comparison of display technology

References