EP1330022A2
Expired / Lapsed
EP
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Electric circuit
Assignee: Semiconductor Energy Laboratory Co Ltd
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Filing: 2003-01-08
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Granted: —
•
Expires: 2023-01-08
Abstract
Abstract The transistor suffers the variation caused in threshold voltage or mobility due to gathering of the factors of the variation in gate insulator film resulting from a difference in manufacture process or substrate used and of the variation in channel-region crystal state. The present invention provides an electric circuit having an arrangement such that both electrodes of a capacitance element can hold a gate-to-source voltage of a particular transistor. The invention provides an electric circuit having a function capable of setting a potential difference at between the both electrodes of the capacitance element by the use of a constant-current source.
Inventors
- 👤 Hajime Semiconductor Energy Lab. Co. Ltd. Kimura
- 👤 Yasuko Semiconductor Energy Lab.Co. Ltd Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 06:34
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/45; H03F3/45071; H03F3/45076; H03F3/45179; H03F3/50; G; G11; G11C; G11C27/00; G11C27/02; G11C27/024; G11C27/028; H03F3/04; H03F3/08; H03F3/082; H03F3/45183; H03K; H03K19/00; H03K19/003; H03K19/00369; H03K19/00384
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
101 words
An electric circuit for outputting an output potential at an output terminal on
the basis of an input potential inputted at an input terminal, the electric circuit
comprising: a capacitance element for converting a current supplied from a constant current
source into a voltage; a transistor for supplying a current dependent upon a converted voltage; a first switch connected between the input terminal and a gate electrode of the
transistor; and a second switch connected between a source electrode of the transistor and the
output terminal, whereby the capacitance element is connected between a gate and a source of
the transistor.
Claim 2
Dependent Claim
23 words
An electric circuit according to claim 1, wherein the input voltage is a
potential of a signal supplied from a photoelectric converter element.
Claim 3
Dependent Claim
41 words
An electric circuit according to claim 1, wherein an amount of a current
flowing at between the source and the drain of the transistor is the same as an amount of
a current to be supplied from the constant current source.
Claim 4
Dependent Claim
30 words
An electric circuit according to claim 1, wherein the electric circuit is
configured with one selected from a source-follower circuit, a differential amplifier, an
operational amplifier and an amplifier circuit.
Claim 5
Dependent Claim
129 words
An electric circuit for outputting an output potential at an output terminal on
the basis of an input potential inputted at an input terminal, the electric circuit
comprising: first and second capacitance elements for converting a current supplied from a
constant current source into a voltage; first and second transistors for supplying a current dependent upon a converted
voltage and connected in series; a first switch connected between the input terminal and a gate electrode of the
first transistor; and a second switch connected between a source electrode of the first transistor and
the output terminal, whereby the first capacitance element is connected between a gate and a source
of the first transistor and second capacitance element is connected between a gate and a
source of the second transistor.
Claim 6
Dependent Claim
23 words
An electric circuit according to claim 5, wherein the input voltage is a
potential of a signal supplied from a photoelectric converter element.
Claim 7
Dependent Claim
44 words
An electric circuit according to claim 5, wherein an amount of a current
flowing at between the source and the drain of the first and second transistors is the
same as an amount of a current to be supplied from the constant current source.
Claim 8
Dependent Claim
19 words
An electric circuit according to claim 5, wherein the first and second
transistors are of a same conductor type.
Claim 9
Dependent Claim
30 words
An electric circuit according to claim 5, wherein the electric circuit is
configured with one selected from a source-follower circuit, a differential amplifier, an
operational amplifier and an amplifier circuit.
Claim 10
Dependent Claim
139 words
An electric circuit for outputting an output potential at an output terminal
on the basis of an input potential inputted at an input terminal, the electric circuit
comprising: first and second transistors arranged between first and second power lines and
connected in series; a capacitance element for converting into a voltage a current, caused by
inputting a bias potential to a gate electrode of the second transistor, flowing at between
the first and second power lines; a first switch connected between the input terminal and a gate electrode of the
first transistor; and a second switch connected between a source electrode of the first transistor and
the output terminal, whereby a current flows at between a source and a drain of the first transistor,
in an amount dependent upon a charge held between both electrodes of the capacitance
element.
Claim 11
Dependent Claim
23 words
An electric circuit according to claim 10, wherein the input voltage is a
potential of a signal supplied from a photoelectric converter element.
Claim 12
Dependent Claim
19 words
An electric circuit according to claim 10, wherein the first and second
transistors are of a same conductor type.
Claim 13
Dependent Claim
30 words
An electric circuit according to claim 10, wherein the electric circuit is
configured with one selected from a source-follower circuit, a differential amplifier, an
operational amplifier and an amplifier circuit.
Claim 14
Dependent Claim
101 words
A display device comprising: a driving circuit for outputting an output potential at an output terminal on the
basis of an input potential inputted at an input terminal; a capacitance element for converting a current supplied from a constant current
source into a voltage; a transistor for supplying a current dependent upon a converted voltage; a first switch connected between the input terminal and a gate electrode of the
transistor; and a second switch connected between a source electrode of the transistor and the
output terminal, whereby the capacitance element is connected between a gate and a source of
the transistor.
Claim 15
Dependent Claim
23 words
A display device according to claim 14, wherein the input voltage is a
potential of a signal supplied from a photoelectric converter element.
Claim 16
Dependent Claim
41 words
A display device according to claim 14, wherein an amount of a current
flowing at between the source and the drain of the transistor is the same as an amount of
a current to be supplied from the constant current source.
Claim 17
Dependent Claim
31 words
A display device according to claim 14 wherein the driving circuit
according is configured with one selected from a source-follower circuit, a differential
amplifier, an operational amplifier and an amplifier circuit.
Claim 18
Dependent Claim
55 words
A display device according to claim 14 wherein the display device is
incorporated into an electronic apparatus selected from the group consisting of a video
camera, a digital camera, a goggle-type display, a navigation system, an audio
reproducing apparatus, a notebook personal computer, a game apparatus, a personal
digital assistant and an image reproducing apparatus.
Claim 19
Dependent Claim
129 words
A display device comprising: a driving circuit for outputting an output potential at an output terminal on the
basis of an input potential inputted at an input terminal; first and second capacitance elements for converting a current supplied from a
constant current source into a voltage; first and second transistors for supplying a current dependent upon a converted
voltage and connected in series; a first switch connected between the input terminal and a gate electrode of the
first transistor; and a second switch connected between a source electrode of the first transistor and
the output terminal, whereby the first capacitance element is connected between a gate and a source
of the first transistor and second capacitance element is connected between a gate and a
source of the second transistor.
Claim 20
Dependent Claim
23 words
A display device according to claim 19, wherein the input voltage is a
potential of a signal supplied from a photoelectric converter element.
Claim 21
Dependent Claim
44 words
A display device according to claim 19, wherein an amount of a current
flowing at between the source and the drain of the first and second transistors is the
same as an amount of a current to be supplied from the constant current source.
Claim 22
Dependent Claim
19 words
A display device according to claim 19, wherein the first and second
transistors are of a same conductor type.
Claim 23
Dependent Claim
30 words
A display device according to claim 19, wherein the driving circuit is
configured with one selected from a source-follower circuit, a differential amplifier, an
operational amplifier and an amplifier circuit.
Claim 24
Dependent Claim
55 words
A display device according to claim 19, wherein the display device is
incorporated into an electronic apparatus selected from the group consisting of a video
camera, a digital camera, a goggle-type display, a navigation system, an audio
reproducing apparatus, a notebook personal computer, a game apparatus, a personal
digital assistant and an image reproducing apparatus.
Claim 25
Dependent Claim
139 words
A display device comprising: a driving circuit for outputting an output potential at an output terminal on the
basis of an input potential inputted at an input terminal; first and second transistors arranged between first and second power lines and
connected in series; a capacitance element for converting into a voltage a current, caused by
inputting a bias potential to a gate electrode of the second transistor, flowing at between
the first and second power lines; a first switch connected between the input terminal and a gate electrode of the
first transistor; and a second switch connected between a source electrode of the first transistor and
the output terminal, whereby a current flows at between a source and a drain of the first transistor,
in an amount dependent upon a charge held between both electrodes of the capacitance
element.
Claim 26
Dependent Claim
23 words
A display device according to claim 25, wherein the input voltage is a
potential of a signal supplied from a photoelectric converter element.
Claim 27
Dependent Claim
19 words
A display device according to claim 25, wherein the first and second
transistors are of a same conductor type.
Claim 28
Dependent Claim
30 words
A display device according to claim 25, wherein the driving circuit is
configured with one selected from a source-follower circuit, a differential amplifier, an
operational amplifier and an amplifier circuit.
Claim 29
Dependent Claim
55 words
A display device according to claim 25 wherein the display device is
incorporated into an electronic apparatus selected from the group consisting of a video
camera, a digital camera, a goggle-type display, a navigation system, an audio
reproducing apparatus, a notebook personal computer, a game apparatus, a personal
digital assistant and an image reproducing apparatus.
References Cited (Backward Citations)
JPH03139908A
Cited
JP2000194327A
Cited
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