Image sensor in which illumination by electroluminescent device

Details Image sensor in which illumination by electroluminescent device Image sensor in which illumination by electroluminescent device

Filed on

1992-08-25

Date issued

1995-01-24

Examiner

Nelms, David C.

Patent Class

Radiant energy

SubClass

Photocells; circuits and apparatus

SubSubClass

Photocell controlled circuit

Other Related Categories

313498, 315246, H01J 4014

Type

Patent

Status

active

Patent number

053844564

Description

ABSTRACT:
An electroluminescent device comprising a first electrode, a second electrode and an electroluminescence emission zone, the electroluminescence emission zone being made of a first electroluminescence emission layer, a second electroluminescence emission layer, and a transparent electrode which is interposed between the first electroluminescence emission layer and the second electroluminescence emission layer. At least either the first electrode or the second electrode is a transparent electrode. The first electroluminescence emission layer and the second electro luminescence emission layer emit light by applying a driving voltage to the transparent electrode with both the first electrode and the second electrode connected to a power supply for a reference voltage. In an image sensor using such an electroluminescent device as a light source, the electric field produced by the driving signal of the electroluminescent device does not escape outward, presenting no interfering noise to the image sensor. The resulting light quantity is almost double that of devices with only a single electroluminescent layer, substantially enhancing a resulting image. As a result, a high S/N ratio image sensor may be fabricated.

REFERENCES:
patent: 3604938 (1971-09-01), Kohashi et al.
patent: 3699374 (1972-10-01), Scholl et al.
patent: 3975661 (1976-08-01), Kanatani et al.
patent: 4027192 (1977-05-01), Hanak
patent: 4743808 (1988-05-01), Mitsumori
patent: 5164580 (1992-11-01), Funada et al.

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