G - Physics – 02 – F
Patent
G - Physics
02
F
G02F 1/1335 (2006.01) F21V 5/02 (2006.01) F21V 8/00 (2006.01) G02F 1/13357 (2006.01) G03H 1/22 (2006.01)
Patent
CA 2171655
An improved holographic backlight (10) and liquid crystal display (21) system. The holographic backlight (10) comprises a cold cathode fluorescent tube (11) for providing white light, and a light pipe (13) disposed to receive the white light. A phase retarding film layer (14) is attached to a first surface (15) of the light pipe (13). A double-layer reflection/transmission hologram (16) is disposed on an output surface (17) of the light pipe (13) opposite the film layer (14). Light from the cold cathode fluorescent tube (11) is injected into the light pipe (13), and is diffracted off of the double-layer hologram (16). This produces quasi-collimated s-polarized light having well-defined spectral colors that is transmitted by the hologram (16) in an array of red, green, and blue patches of light corresponding to the clear apertures of the red, green, and blue elements (22) of an active matrix liquid crystal display (21). The result is a liquid crystal display (21) with high display brightness, reduced battery power requirements, increased battery lifetime, and high contrast over a wide viewing angle.
Hughes Aircraft Company
Sim & Mcburney
LandOfFree
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