Backlighting apparatus

Details Backlighting apparatus Backlighting apparatus

1989-10-02

1990-12-04

Lazarus, Ira S.

Illumination

Revolving

362 27, F21V 800

Patent

active

049758080

ABSTRACT:
Improved backlighting apparatus evenly illuminates positive and negative LCDs under all ambient lighting conditions. Incandescent lamps (301-304) provide light for distribution by a light pipe (101). The bottom of the light pipe (101) is selectively painted white to reflect light to the top of the light pipe (101) while the unpainted areas reflect light internal to the light pipe (101), controlling hot and dim spots. The corners of the light pipe (101) near the lamps (301-304) are dual angled to reflect the light into the center of the display. The burn-out of a lamp (301-304) will not substantially affect the even lighting capabilities of the apparatus.

REFERENCES:
patent: 2838865 (1958-06-01), Hardesty
patent: 3450870 (1969-06-01), Curl
patent: 3892959 (1975-07-01), Pulles
patent: 4096550 (1978-06-01), Boller
patent: 4229783 (1980-10-01), Eberhardt
patent: 4247928 (1981-01-01), Dorfman
patent: 4573766 (1986-03-01), Bournay, Jr.
patent: 4729067 (1988-03-01), Ohe
patent: 4735495 (1988-04-01), Herkes
patent: 4755035 (1988-07-01), Kopish et al.
patent: 4789224 (1988-12-01), Bougsty
patent: 4909604 (1990-03-01), Kobayashi et al.

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