Optical sensor device including amplifier circuit and feedback resistor
First Claim
1. An optical sensor device comprising:
- an optical sensor element;
an amplifier circuit comprising a transistor; and
a feedback resistor,wherein a first electrode of the optical sensor element is electrically connected to a first input terminal of the amplifier circuit and a first terminal of the feedback resistor,wherein a second terminal of the feedback resistor is electrically connected to an output terminal of the amplifier circuit,wherein a second input terminal of the amplifier circuit is electrically connected to an second electrode of the optical sensor element, andwherein the optical sensor element is provided over the transistor with an insulating film interposed therebetween.
0 Assignments
0 Petitions
Accused Products
Abstract
In an optical sensor device employing an amorphous silicon photodiode, an external amplifier IC and the like are required due to low current capacity of the sensor element in order to improve the load driving capacity. It to increase in cost and mounting space of the optical sensor device. In addition, noise may easily superimpose since the photodiode and the amplifier IC are connected to each other over a printed circuit board. According to the invention, an amorphous silicon photodiode and an amplifier configured by a thin film transistor are formed integrally over a substrate so that the load driving capacity is improved while reducing cost and mounting space. Superimposing noise can also be reduced.
-
Citations
33 Claims
-
1. An optical sensor device comprising:
-
an optical sensor element; an amplifier circuit comprising a transistor; and a feedback resistor, wherein a first electrode of the optical sensor element is electrically connected to a first input terminal of the amplifier circuit and a first terminal of the feedback resistor, wherein a second terminal of the feedback resistor is electrically connected to an output terminal of the amplifier circuit, wherein a second input terminal of the amplifier circuit is electrically connected to an second electrode of the optical sensor element, and wherein the optical sensor element is provided over the transistor with an insulating film interposed therebetween. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. An optical sensor device comprising:
-
an optical sensor element; an amplifier circuit; a feedback resistor; a first level shift circuit; and a second level shift circuit, wherein a first electrode of the optical sensor element is electrically connected to a first input terminal of the amplifier circuit through the first level shift circuit, wherein the first electrode of the optical sensor element is electrically connected to a first terminal of the feedback resistor, wherein a second terminal of the feedback resistor is electrically connected to an output terminal of the amplifier circuit, and wherein a second input terminal of the amplifier circuit is electrically connected to a second electrode of the optical sensor element through the second level shift circuit. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
-
23. An optical sensor device comprising:
-
an optical sensor element; an amplifier circuit; a feedback resistor; a first level shift circuit; and a second level shift circuit, wherein a first electrode of the optical sensor element is electrically connected to a first input terminal of the amplifier circuit through the first level shift circuit, wherein the first electrode of the optical sensor element is electrically connected to a first terminal of the feedback resistor, wherein a second terminal of the feedback resistor is electrically connected to an output terminal of the amplifier circuit, wherein a second input terminal of the amplifier circuit is electrically connected to an second electrode of the optical sensor element through the second level shift circuit, wherein the first level shift circuit comprises a first transistor and a first constant current source, and wherein the second level shift circuit comprises a second transistor and a second constant current source. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
-
Specification