LCD display with multifaceted back reflector

Details LCD display with multifaceted back reflector LCD display with multifaceted back reflector

1990-12-07

1992-07-07

Sugarman, Scott J.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359851, 362346, G02F 113, G02B 508, F21V 700

Patent

active

051287870

ABSTRACT:
In accordance with the present invention, a transparent display, such as an LCD, is provided with back reflector having a plurality of reflecting facets angularly displaced with respect to the plane of the display cell so as to enhance contrast of the display without consumption of additional power while reducing glare. Advantageously the reflecting facets are oriented to concentrate reflection to a viewer of light above the viewer and light coming from over the viewer's shoulder. The result of such concentration is a display having backlit visual characteristics without the consumption of backlighting power. Preferred embodiments are disclosed for vertical and horizontal mounting.

REFERENCES:
patent: 4106859 (1978-08-01), Doriguzzi et al.
patent: 4185895 (1980-01-01), Stephens et al.
patent: 4249801 (1981-02-01), Masubuchi
patent: 4415236 (1983-11-01), Perregaux
patent: 4431272 (1984-02-01), Yazawa et al.
patent: 4706173 (1987-11-01), Hamada et al.
patent: 4991940 (1991-02-01), Dalisa et al.
patent: 5054900 (1991-10-01), Simson

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