Light sensing film and light sensor circuit using the same

Details Light sensing film and light sensor circuit using the same Light sensing film and light sensor circuit using the same

2005-12-27

2005-12-27

Le, Que T. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140AL

Reexamination Certificate

active

06979811

ABSTRACT:
A light sensing film formed by laminating together a transparent/translucent material, an upper transparent electrode, a photosensitive dielectric layer including photosensitive dielectric material, and a lower electrode formed from conductive material such as carbon, a silver coating, a metallic plate, or a conductive coating. A capacitor is composed between the two electrodes. As the dielectric constant of the photosensitive dielectric layer between the two electrodes changes when light enters, capacitance of the capacitor changes, and light intensity can be detected. To regulate capacitance, an additional dielectric layer may be provided between the photosensitive dielectric layer and the lower electrode. The underside of the electrode may be laminated with protective material.

REFERENCES:
patent: 3963488 (1976-06-01), Brushenko

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