Image reading apparatus containing light receiving transistors and switching transistors
First Claim
1. An image reading apparatus containing light receiving transistors and switching transistors comprising:
- a transparent substrate;
a light-emitting unit for emitting light to pass through said transparent substrate and to be applied to at least one subject pressed against said transparent substrate;
a plurality of received-light thin-film transistors having active layers composed of photoconductive semiconductors, said received-light thin-film transistors spaced apart in the vertical and horizontal directions in said transparent substrate at a surface of said transparent substrate to which said at least one subject is pressed, said received-light thin-film transistors receiving light emitted from said light emitting member and deflected from said at least one subject, and wherein said received-light thin-film transistors generate an electrical signal corresponding to the amount of said light received from said light deflected from said at least one subject;
switching thin-film transistors arranged at said surface of said transparent substrate having said received-light thin-film transistors arranged therein in correspondence with each of said received-light thin-film transistors so as to control an output of each of said received-light thin-film transistors;
reading mechanism operational to read an image of said at least one subject, wherein said reading mechanism includes a received-light-voltage generating circuit operational to generate a received-light-voltage for each of said received-light thin-film transistors corresponding to the amount of said electrical signal generated by each of said received-light thin-film transistors; and
an image signal outputting mechanism operational to output an image signal in response to a received-light-voltage generated by said received-light-voltage generating circuit.
1 Assignment
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Accused Products
Abstract
An inexpensive, miniaturized and thin image reading apparatus reads various types of images, such as fingerprints. The apparatus includes a transparent substrate. A light-emitting unit emits light to pass through the transparent substrate and to be applied to a subject pressed against the substrate. A plurality of light-receiving units are disposed on the substrate in the vertical and horizontal directions with intervals therebetween and receive the light which is emitted from the light-emitting unit and is reflected from the subject. A reading device reads an image of the subject in accordance with the amount of light received by the light-receiving units.
172 Citations
12 Claims
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1. An image reading apparatus containing light receiving transistors and switching transistors comprising:
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a transparent substrate; a light-emitting unit for emitting light to pass through said transparent substrate and to be applied to at least one subject pressed against said transparent substrate; a plurality of received-light thin-film transistors having active layers composed of photoconductive semiconductors, said received-light thin-film transistors spaced apart in the vertical and horizontal directions in said transparent substrate at a surface of said transparent substrate to which said at least one subject is pressed, said received-light thin-film transistors receiving light emitted from said light emitting member and deflected from said at least one subject, and wherein said received-light thin-film transistors generate an electrical signal corresponding to the amount of said light received from said light deflected from said at least one subject; switching thin-film transistors arranged at said surface of said transparent substrate having said received-light thin-film transistors arranged therein in correspondence with each of said received-light thin-film transistors so as to control an output of each of said received-light thin-film transistors; reading mechanism operational to read an image of said at least one subject, wherein said reading mechanism includes a received-light-voltage generating circuit operational to generate a received-light-voltage for each of said received-light thin-film transistors corresponding to the amount of said electrical signal generated by each of said received-light thin-film transistors; and an image signal outputting mechanism operational to output an image signal in response to a received-light-voltage generated by said received-light-voltage generating circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An image reading apparatus containing light receiving transistors and switching transistors comprising:
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a transparent substrate; a light emitting member for emitting light passing through said transparent substrate and radiating to the subjects pressed against said transparent substrate; a plurality of received-light thin-film transistors having active layers composed of photoconductive semiconductors spaced apart in horizontal and vertical directions in said transparent substrate at a surface of said transparent substrate to which the subjects are pressed, receiving a reflected light of light emitted from said light emitting member and radiated against said subjects, and generating an electrical load in response to an amount of received light of said reflected light; switching thin-film transistors arranged at a surface of said transparent substrate having said received-light thin-film transistors arranged therein in correspondence with each of said received-light thin-film transistors so as to control an output of each of said received-light thin-film transistor; a reading means for reading the image of the subjects in response to an amount of received light of said received-light thin-film transistors; and wherein said reading means includes a received-light-voltage generating circuit for generating a received-light-voltage for each of said received-light thin-film transistors in response to an amount of electrical load generated by said received-light thin-film transistors; and
an image signal outputting means for outputting an image signal in response to a received-light-voltage generated by said received-light-voltage generating circuit, and the surface of said transparent substrate against which the subjects are pressed can be moved up and down. - View Dependent Claims (12)
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Specification