Optical sensor device and electronic apparatus with an amplifier circuit and dual level shift circuit
First Claim
1. An optical sensor device comprising:
- an optical sensor element;
an amplifier circuit;
an I-V conversion resistor;
a first level shift circuit; and
a second level shift circuit,wherein a first input terminal of the amplifier circuit is electrically connected to the I-V conversion resistor and a first electrode of the optical sensor element through the first level shift circuit,wherein an output terminal of the amplifier circuit is electrically connected to a second input terminal of the amplifier circuit through the second level shift circuit, andwherein the optical sensor element and the amplifier circuit are formed over a substrate.
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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 leads 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 be also reduced.
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Citations
26 Claims
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1. An optical sensor device comprising:
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an optical sensor element; an amplifier circuit; an I-V conversion resistor; a first level shift circuit; and a second level shift circuit, wherein a first input terminal of the amplifier circuit is electrically connected to the I-V conversion resistor and a first electrode of the optical sensor element through the first level shift circuit, wherein an output terminal of the amplifier circuit is electrically connected to a second input terminal of the amplifier circuit through the second level shift circuit, and wherein the optical sensor element and the amplifier circuit are formed over a substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 25)
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13. An electronic apparatus comprising:
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a display portion; and an optical sensor device operationally connected to the display portion, the optical sensor device comprising; an optical sensor element; an amplifier circuit; an I-V conversion resistor; a first level shift circuit; and a second level shift circuit, wherein a first input terminal of the amplifier circuit is electrically connected to the I-V conversion resistor and a first electrode of the optical sensor element through the first level shift circuit, wherein an output terminal of the amplifier circuit is electrically connected to a second input terminal of the amplifier circuit through the second level shift circuit, and wherein the optical sensor element and the amplifier circuit are formed over a substrate. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26)
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Specification