LCD assembly with easily installed filter

Details LCD assembly with easily installed filter LCD assembly with easily installed filter

1990-09-14

1992-03-24

Heyman, John S.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

362 23, 362373, 359 71, 359 83, 359892, G02F 113, G02B 700, G01D 1128, B60Q 106

Patent

active

050981790

ABSTRACT:
A light modifying device for a liquid crystal display mounted on a PC board is provided with a filter and/or reflector of sheet material which is conveniently releasably installed between the liquid crystal display and the PC board to effect alteration of the properties of light passing through the liquid crystal display. Externally originating light which does not pass through the filter is reflected back to help light the LCD. For this purpose the surface of the filter adjacent the LCD includes a coating that is reflective, as well as light transmissive. The device is provided with securement means for holding the filter in place, but facilitating simple installation and removal.

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patent: 4813642 (1989-03-01), Matsui
patent: 4823245 (1989-04-01), Leverte
patent: 4929062 (1990-05-01), Guzik et al.

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