Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
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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Gilbarco Inc.
Heyman John S.
Trice Ron
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