Holographic backlight for flat panel displays

Details Holographic backlight for flat panel displays Holographic backlight for flat panel displays

1995-03-21

1997-07-22

Dzierzynski, Paul M.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 19, 359 34, 385146, 346479, 349 61, G02B 532, G02B 610, B60Q 144, G03H 100

Patent

active

056508654

ABSTRACT:
An improved holographic backlight and liquid crystal display system. The holographic backlight comprises a cold cathode fluorescent tube for providing white light, and a light pipe disposed to receive the white light. A phase retarding film layer is attached to a first surface of the light pipe. A double-layer reflection/transmission hologram is disposed on an output surface of the light pipe opposite the film layer. Light from the cold cathode fluorescent tube is injected into the light pipe, and is diffracted off of the double-layer hologram. This produces quasi-collimated s-polarized light having well-defined spectral colors that is transmitted by the hologram in an array of red, green, and blue patches of light corresponding to the clear apertures of the red, green, and blue elements of an active matrix liquid crystal display. The result is a liquid crystal display with high display brightness, reduced battery power requirements, increased battery lifetime, and high contrast over a wide viewing angle.

REFERENCES:
patent: 5101193 (1992-03-01), Smith et al.
patent: 5237641 (1993-08-01), Jacobson et al.
patent: 5303322 (1994-04-01), Winston et al.
patent: 5341230 (1994-08-01), Smith
patent: 5418631 (1995-05-01), Tedesco
patent: 5515184 (1996-05-01), Caufield et al.

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