Illuminating device for illuminating background surfaces

Details Illuminating device for illuminating background surfaces Illuminating device for illuminating background surfaces

1993-02-16

1994-11-22

Husar, Stephen F.

Illumination

Display backlight

Lcd backlight

362243, 362249, 362800, G09F 1304

Patent

active

053674413

ABSTRACT:
An illuminating device for illuminating a background surface of a surface display has a frame with inner reflecting surfaces. A circuit board with leads closes off the interior of the frame. The circuit board is made of a light-transmissive material and serves as the background surface to be illuminated. The circuit board comprises leads and light-emitting diode chips connected to the leads so as to be controllable. A scattering body in the form of a light-transmissive potting compound containing scattering centers is filled into the interior of the frame. The circuit board is preferably a circuit board with a cover layer of a non-light-transmissive material from which the coating of non-light-transmissive material has been removed by etching. The scattering centers are preferably in the form of glass particles.

REFERENCES:
patent: 4761720 (1988-08-01), Solow
patent: 4975814 (1990-12-01), Schairer
patent: 5140220 (1992-08-01), Hasegawa

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