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US 6,747,638 B2Granted
Adhesion type area sensor and display device having adhesion type area sensor
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsShunpei Yamazaki, Jun Koyama
Life of this patent
Estimating the term…
Abstract
A lightweight, thin, small size adhesion type area sensor is provided. A pixel of the area sensor has an EL element as a light source, and a photodiode as a photoelectric conversion element. A TFT is used with the adhesion type area sensor for controlling the operation of the EL element and the photodiode.
Claims59
An adhesion type area sensor comprising a sensor portion, having a plurality of pixels, formed on a substrate, wherein:
- the plurality of pixels have a photodiode, an EL element, a switching TFT, an EL driver TFT, a reset TFT, a buffer TFT, a selection TFT;
- a source signal line;
- a gate signal line;
- an electric power source supply line for maintaining a constant electric potential;
- a reset gate signal line;
- a sensor gate signal line;
- a sensor output wiring connected to a constant electric current power supply;
- and a sensor electric power source line for maintaining a constant electric potential;
- a gate electrode of the switching TFT is connected to the gate signal line;
- one of a source region and a drain region of the switching TFT is connected to the source signal line, and the other is connected to a gate electrode of the EL driver TFT;
- one of a source region and a drain region of the EL driver TFT is connected to the electric power source supply line, and the other is connected to the EL element;
- a source region of the reset TFT is connected to the sensor electric power source line;
- a drain region of the reset TFT is connected to a gate electrode of the buffer TFT and to the photodiode;
- a drain region of the buffer TFT is connected to the sensor electric power line;
- one of a source region and a drain region of the selection TFT is connected to the sensor output wiring, and the other is connected to a source region of the buffer TFT;
- a gate electrode of the selection TFT is connected to the sensor gate signal line;
- light emitted from the EL element is reflected on a subject and irradiated to the photodiode;
- and
- an image signal generated from the light irradiated to the photodiode is input to the sensor output wiring.
16 more elements
A sensor according to claim 11, wherein the reset TFT is a p-channel TFT, and the buffer TFT is an n-channel TFT, when the cathode electrode of the photodiode is connected to the drain region of the reset TFT.
An adhesion type area sensor comprising a sensor portion, having a plurality of pixels, formed on wherein:
- the plurality of pixels have a photodiode, a switching TFT, an EL driver TFT, a reset TFT, a substrate, an EL element, a buffer TFT, a selection TFT;
- a source signal line;
- a gate signal line;
- an electric power source supply line for maintaining a constant electric potential;
- a reset gate signal line;
- a sensor gate signal line;
- a sensor output wiring connected to a constant electric current power supply;
- and a sensor electric power source line for maintaining a constant electric potential;
- a gate electrode of the switching TFT is connected to the gate signal line;
- one of a source region and a drain region of the switching TFT is connected to the source signal line, and the other is connected to a gate electrode of the EL driver TFT;
- one of a source region and a drain region of the EL driver TFT is connected to the electric power source supply line, and the other is connected to the EL element;
- a source region of the reset TFT is connected to the sensor electric power source line;
- a drain region of the reset TFT is connected to a gate electrode of the buffer TFT and to the photodiode;
- a drain region of the buffer TFT is connected to the sensor electric power line;
- one of a source region and a drain region of the selection TFT is connected to the sensor output wiring, and the other is connected to a source region of the buffer TFT;
- a gate electrode of the selection TFT is connected to the sensor gate signal line;
- the polarity of the switching TFT and selection TFT are the same;
- light emitted from the EL element is reflected on a subject and irradiated to the photodiode;
- and
- an image signal generated from the light irradiated to the photodiode is input to the sensor output wiring.
17 more elements
An adhesion type area sensor comprising a sensor portion, having a plurality of pixels, formed on a substrate, wherein:
- the plurality of pixels have a photodiode, an EL element, a switching TFT, an EL driver TFT, a reset TFT, a buffer TFT, a selection TFT;
- a source signal line;
- a gate signal line;
- an electric power source supply line for maintaining a constant electric potential;
- a reset gate signal line;
- a sensor gate signal line;
- a sensor output wiring connected to a constant electric current power supply;
- and a sensor electric power source line for maintaining a constant electric potential;
- a gate electrode of the switching TFT is connected to the gate signal line;
- one of a source region and a drain region of the switching TFT is connected to the source signal line, and the other is connected to a gate electrode of the EL driver TFT;
- one of a source region and a drain region of the EL driver TFT is connected to the electric power source supply line, and the other is connected to the EL element;
- a source region of the reset TFT is connected to the sensor electric power source line;
- a drain region of the reset TFT is connected to a gate electrode of the buffer TFT and to the photodiode;
- a drain region of the buffer TFT is connected to the sensor electric power line;
- one of a source region and a drain region of the selection TFT is connected to the sensor output wiring, and the other is connected to a source region of the buffer TFT;
- a gate electrode of the selection TFT is connected to the sensor gate signal line;
- the reset TFT and the selection TFT are switched from an ON state to an OFF state, or from an OFF state to an ON state at the same time in accordance with the signal input to the reset gate signal line and the sensor gate signal line;
- one of the reset TFT and the selection TFT is in an ON state when the other is in an OFF state;
- light emitted from the EL element is reflected on a subject and irradiated to the photodiode;
- and
- an image signal generated from the light irradiated to the photodiode is input to the sensor output wiring.
18 more elements
An adhesion type area sensor comprising a sensor portion, having a plurality of pixels, formed on a substrate, wherein:
- the plurality of pixels have a photodiode, an EL element, a switching TFT, an EL driver TFT, a reset TFT, a buffer TFT, a selection TFT;
- a source signal line;
- a gate signal line;
- an electric power source supply line for maintaining a constant electric potential;
- a reset gate signal line;
- a sensor gate signal line;
- a sensor output wiring connected to a constant electric current power supply;
- and a sensor electric power source line for maintaining a constant electric potential;
- a gate electrode of the switching TFT is connected to the gate signal line;
- one of a source region and a drain region of the switching TFT is connected to the source signal line, and the other is connected to a gate electrode of the EL driver TFT;
- one of a source region and a drain region of the EL driver TFT is connected to the electric power source supply line, and the other is connected to the EL element;
- a source region of the reset TFT is connected to the sensor electric power source line;
- a drain region of the reset TFT is connected to a gate electrode of the buffer TFT and to the photodiode;
- a drain region of the buffer TFT is connected to the sensor electric power line;
- one of a source region and a drain region of the selection TFT is connected to the sensor output wiring, and the other is connected to a source region of the buffer TFT;
- a gate electrode of the selection TFT is connected to the gate signal line;
- the polarity of the switching TFT and the selection TFT are the same;
- the reset TFT and the selection TFT are switched from an ON state to an OFF state, or from an OFF state to an ON state at the same time in accordance with the signal input to the reset gate signal line and the sensor gate signal line;
- one of the reset TFT and the selection TFT is in an ON state when the other is in an OFF state;
- light emitted from the EL element is reflected on a subject and irradiated to the photodiode;
- and
- an image signal generated from the light irradiated to the photodiode is input to the sensor output wiring.
19 more elements
A sensor according to 22, wherein the photodiode has a cathode electrode, an anode electrode, and a photoelectric conversion layer formed between the anode electrode and the cathode electrode.
A display device comprising a sensor portion, having a plurality of pixels, formed on a substrate, wherein:
- the plurality of pixels have a photodiode, an EL element, a switching TFT, an EL driver TFT, a reset TFT, a buffer TFT, a selection TFT;
- a source signal line;
- a gate signal line;
- an electric power source supply line for maintaining a constant electric potential;
- a reset gate signal line;
- a sensor gate signal line;
- a sensor output wiring connected to a constant electric current power supply;
- and a sensor electric power source line for maintaining a constant electric potential;
- a gate electrode of the switching TFT is connected to the gate signal line;
- one of a source region and a drain region of the switching TFT is connected to the source signal line, and the other is connected to a gate electrode of the EL driver TFT;
- one of a source region and a drain region of the EL driver TFT is connected to the electric power source supply line, and the other is connected to the EL element;
- a source region of the reset TFT is connected to the sensor electric power source line;
- a drain region of the reset TFT is connected to a gate electrode of the buffer TFT and to the photodiode;
- a drain region of the buffer TFT is connected to the sensor electric power line;
- one of a source region and a drain region of the selection TFT is connected to the sensor output wiring, and the other is connected to a source region of the buffer TFT;
- a gate electrode of the selection TFT is connected to the sensor gate signal line;
- light emitted from the EL element is controlled in accordance with the switching TFT and the EL driver TFT;
- and
- the sensor portion displays an image in accordance with the light emitted from the EL element;
- or the light emitted from the EL element is irradiated to the photodiode by being reflected on a subject, and an image signal is generated from the light irradiated to the photodiode in accordance with the photodiode, the reset TFT, the buffer TFT, and the selection TFT.
17 more elements
A display device comprising a sensor portion, having a plurality of pixels, formed on a substrate, wherein:
- the plurality of pixels have a photodiode, an EL element, a switching TFT, an EL driver TFT, a reset TFT, a buffer TFT, a selection TFT;
- a source signal line;
- a gate signal line;
- an electric power source supply line for maintaining a constant electric potential;
- a reset gate signal line;
- a sensor gate signal line;
- a sensor output wiring connected to a constant electric current power supply;
- and a sensor electric power source line for maintaining a constant electric potential;
- a gate electrode of the switching TFT is connected to the gate signal line;
- one of a source region and a drain region of the switching TFT is connected to the source signal line, and the other is connected to a gate electrode of the EL driver TFT;
- one of a source region and a drain region of the EL driver TFT is connected to the electric power source supply line, and the other is connected to the EL element;
- a source region of the reset TFT is connected to the sensor electric power source line;
- a drain region of the reset TFT is connected to a gate electrode of the buffer TFT and to the photodiode;
- a drain region of the buffer TFT is connected to the sensor electric power line;
- one of a source region and a drain region of the selection TFT is connected to the sensor output wiring, and the other is connected to a source region of the buffer TFT;
- a gate electrode of the selection TFT is connected to the sensor gate signal line;
- the reset TFT and the selection TFT are switched from an ON state to an OFF state, or from an OFF state to an ON state at the same time in accordance with the signal input to the reset gate signal line and the sensor gate signal line;
- one of the reset TFT and the selection TFT is in an ON state when the other is in an OFF state;
- light emitted from the EL element is controlled in accordance with the switching TFT and the EL driver TFT;
- and
- the sensor portion displays an image in accordance with the light emitted from the EL element;
- or the light emitted from the EL element is irradiated to the photodiode by being reflected by a subject, and an image signal is generated from the light irradiated to the photodiode in accordance with the photodiode, the reset TFT, the buffer TFT, and the selection TFT.
19 more elements
A display device comprising a sensor portion, having a plurality of pixels, formed on a sensor substrate, wherein:
- the plurality of pixels have a photodiode, an EL element, a switching TFT, an EL driver TFT, a reset TFT, a buffer TFT, a selection TFT;
- a source signal line;
- a gate signal line;
- an electric power source supply line for maintaining a constant electric potential;
- a reset gate signal line;
- a sensor gate signal line;
- a sensor output wiring connected to a constant electric current power supply;
- and a sensor electric power source line for maintaining a constant electric potential;
- a gate electrode of the switching TFT is connected to the gate signal line;
- one of a source region and a drain region of the switching TFT is connected to the source signal line, and the other is connected to a gate electrode of the EL driver TFT;
- one of a source region and a drain region of the EL driver TFT is connected to the electric power source supply line, and the other is connected to the EL element;
- a source region of the reset TFT is connected to the sensor electric power source line;
- a drain region of the reset TFT is connected to a gate electrode of the buffer TFT and to the photodiode;
- a drain region of the buffer TFT is connected to the sensor electric power source line;
- one of a source region and a drain region of the selection TFT is connected to the sensor output wiring, and the other is connected to a source region of the buffer TFT;
- a gate electrode of the selection TFT is connected to the gate signal line;
- the polarity of the switching TFT and the selection TFT are the same;
- light emitted from the EL element is controlled in accordance with the switching TFT and the EL driver TFT;
- and the sensor portion displays an image in accordance with the light emitted from the EL element;
- or the light emitted from the EL element is irradiated to the photodiode by being reflected by a subject, and an image signal is generated from the light irradiated to the photodiode in accordance with the photodiode, the reset TFT, the buffer TFT, and the selection TFT.
17 more elements
A device according to claim the EL driver TFT is a p-channel TFT when the anode of the EL element is connected to the source region or the drain region of the EL driver TFT.
A display device comprising a sensor portion, having a plurality of pixels formed on a sensor substrate, wherein:
- the plurality of pixels have a photodiode, an EL element, a switching TFT, an EL driver TFT, a reset TFT, a buffer TFT, a selection TFT;
- a source signal line;
- a gate signal line;
- an electric power source supply line for maintaining a constant electric potential;
- a reset gate signal line;
- a sensor gate signal line;
- a sensor output wiring connected to a constant electric current power supply;
- and a sensor electric power source line for maintaining a constant electric potential;
- a gate electrode of the switching TFT is connected to the gate signal line;
- one of a source region and a drain region of the switching TFT is connected to the source signal line, and the other is connected to a gate electrode of the EL driver TFT;
- one of a source region and a drain region of the EL driver TFT is connected to the electric power source supply line, and the other is connected to the EL element;
- a source region of the reset TFT is connected to the sensor electric power source line;
- a drain region of the reset TFT is connected to a gate electrode of the buffer TFT and to the photodiode;
- a drain region of the buffer TFT is connected to the sensor electric power source line;
- one of a source region and a drain region of the selection TFT is connected to the sensor output wiring, and the other is connected to a source region of the buffer TFT;
- a gate electrode of the selection TFT is connected to the gate signal line;
- the polarity of the switching TFT and the selection TFT are the same;
- the reset TFT and the selection TFT are switched from an ON state to an OFF state, or from an OFF state to an ON state at the same time in accordance with the signal input to the reset gate signal line and the sensor gate signal line;
- one of the reset TFT and the selection TFT is in an ON state when the other is in an OFF stage;
- light emitted from the EL element is controlled in accordance with the switching TFT and the EL driver TFT;
- and
- the sensor portion displays an image in accordance with the light emitted from the EL element;
- or the light emitted from the EL element is irradiated to the photodiode by being reflected by a subject, and an image signal is generated from the light irradiated to the photodiode in accordance with the photodiode, the reset TFT, the buffer TFT, and the selection TFT.
20 more elements
Dependencies are inferred from the claim text.