Illumination – Plural light sources – Particular wavelength
Patent
1990-04-02
1991-04-16
Husar, Stephen F.
Illumination
Plural light sources
Particular wavelength
362 29, 362800, F21V 900
Patent
active
050087886
ABSTRACT:
A multi-color illumination apparatus for use in backlighting a liquid crystal display (LCD) device includes a substrate having a plurality of circuit paths made of electrically conductive foil leaf wherein the circuit path's configuration includes a number of tabs in a spaced relationship with one another and interleaved with tabs of an adjacent electrical circuit path. The tabs of one circuit path carry LED dies each of which produce a different color light with the anode of one and the cathode of the other connected to the tab. Leads connect the cathode of one and the anode of the other to the tabs of the adjacent circuit path. The second electrical circuit path also includes tabs in a spaced relationship with one another and located in registry with the tabs of the first electrical circuit path and also carry LED dies forming a second LED color pair. The second LED color pair is connected to tabs of a third electrical circuit which tabs are interleaved with the tabs of the second electrical circuit path. A light frame surrounds the outer peripheral marginal area of the substrate and diffuser tape covers the light frame and substrate below. A layer of reflective white ink covers the substrate surface and has openings in registry with the location of the LED color pairs.
REFERENCES:
patent: 4044708 (1977-08-01), Klein
patent: 4602191 (1986-07-01), Davila
Electronic Research Associates, Inc.
Husar Stephen F.
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