Contact type image sensor having an organic type thin film light emitting element
First Claim
1. A contact type image sensor, comprising:
- an optically transparent substrate having first and second main surfaces;
an illumination source disposed on said first main surface of said transparent substrate, said illumination source being driven by a direct current and having an organic type thin film light emitting element, said organic type thin film light emitting element having an optically transparent anode electrode, a hole transport thin film disposed on said anode electrode, an electron transport organic fluorescent thin film disposed on said hole transport thin film, and a cathode electrode disposed on said electron transport organic fluorescent thin film, said organic type thin film light emitting element being covered with a sealing material; and
a sensor section disposed on said second main surface of said transparent substrate so as to face said organic type thin film emitting element, said sensor section having a thin film photo sensitive element.
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Accused Products
Abstract
A contact type image sensor is disclosed, wherein an illumination source having a thin film light emitting element is opposed to a sensor section having thin film photo sensitive elements, a transparent substrate being disposed therebetween. The thin film light emitting element is so-called an organic thin film EL element, which comprises an anode, a hole transport thin film, an electron transport organic fluorescent thin film, and a cathode. Since the organic thin film EL element can be driven at a low DC voltage, it decrease the fluctuation of the intensity of the illumination light, resulting in remarkably imprving the reading accuracy of an image. In addition, the thin film light emitting element can be operated with a small amount of power. Moreover, it can be thinly structured.
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Citations
15 Claims
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1. A contact type image sensor, comprising:
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an optically transparent substrate having first and second main surfaces; an illumination source disposed on said first main surface of said transparent substrate, said illumination source being driven by a direct current and having an organic type thin film light emitting element, said organic type thin film light emitting element having an optically transparent anode electrode, a hole transport thin film disposed on said anode electrode, an electron transport organic fluorescent thin film disposed on said hole transport thin film, and a cathode electrode disposed on said electron transport organic fluorescent thin film, said organic type thin film light emitting element being covered with a sealing material; and a sensor section disposed on said second main surface of said transparent substrate so as to face said organic type thin film emitting element, said sensor section having a thin film photo sensitive element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A contact type image sensor, comprising:
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an optically transparent substrate having first and second main surfaces; an illumination source disposed on said first main surface of said transparent substrate, said illumination source being driven by a direct current and having an organic type thin film light emitting element, said organic type thin film light emitting element having an optically transparent anode electrode, a hole transport thin film disposed on said anode electrode, an electron transport organic fluorescent thin film disposed on said hole transport thin film, an electron transport organic thin film disposed on said electron transport organic fluorescent thin film, and a cathode electrode disposed on said electron transport organic fluorescent thin film, said organic type thin film light emitting element being covered with a sealing material; and a sensor section disposed on said second main surface of said transparent substrate so as to face said organic type thin film light emitting element, said sensor section having a thin film photosensitive element. - View Dependent Claims (11, 12, 13)
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14. A method of producing a contact type image sensor, comprising the steps of:
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producing, on a transparent substrate having first and second main surfaces, an illumination source having an organic type thin film light emitting element, said illumination source being made by layering a transparent electroconductive thin film constituting an anode electrode, a hole transport thin film, and an electron transport organic fluorescent thin film, and then an electroconductive thin film constituting a cathode electrode, one after the other, on said first main surface of said transparent substrate; covering said organic type thin film light emitting element with a sealing material; and producing a sensor section on said second main surface of said transparent substrate so as to face said organic type thin film light emitting element, said sensor section having a thin film photosensitive element. - View Dependent Claims (15)
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Specification