The oil used in projection TV's
A preferred composition for coupling fluids of this type has been 80% ethylene glycol and 20% glycerol. Further addition of glycerol would cause the projected image to squirm, due to natural convection associated with thermal gradients in a viscous fluid.
Discussions of liquid coupled projection televisions can be found in a variety of issued U.S. patents, including: Tucker, U.S. Pat. No. 4,151,554; Hodges, U.S. Pat. No. 4,163,990; Bauer, U.S. Pat. No. 4,511,927; Fukuda, U.S. Pat. No. 4,620,773; Watanabe et al., U.S. Pat. No. 4,646,143; Roberts, U.S. Pat. No. 4,710,820; and Altman, U.S. Pat. No. 4,764,806.
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