Biological signal processing unit, wireless memory, biological signal processing system, and control system of device to be controlled

A biological signal processing unit comprising:

• an electrode for transmitting an electric signal including information to an inside of a living body;
• a plastic substrate having flexibility;
• an antenna over the plastic substrate having flexibility, the antenna configured to wirelessly communicate with a reader/writer located outside of the living body;
• an interface comprising a rectification circuit provided between the electrode and the antenna and over the plastic substrate having flexibility;
• and
• a processor over the plastic substrate having flexibility, wherein the processor comprises a transistor, the transistor comprising:
• a first insulating film;
• a first electrode over the first insulating film;
• a second insulating film over the first insulating film and the first electrode;
• a semiconductor layer over the second insulating film, so as to overlap with the first electrode, wherein the semiconductor layer comprises a channel region, a first impurity region, and a second impurity region between the channel region and the first impurity region, and wherein a concentration of an impurity element in the second impurity region is lower than a concentration of the impurity element in the first impurity region;
• a third insulating film over the semiconductor layer;
• a second electrode over the third insulating film, so as to overlap with the semiconductor layer;
• a third electrode over the second electrode, wherein a width of the third electrode is shorter than a width of the second electrode in a channel length direction;
• a fourth insulating film over the third insulating film, second electrode and the third electrode;
• and
• a fourth electrode over the fourth insulating film, the fourth electrode electrically connected to the first impurity region through a contact hole in the third insulating film and the fourth insulating film,
• wherein at least the antenna, the rectification circuit, and the processor are provided over the plastic substrate having flexibility with an adhesive agent interposed therebetween.

A wireless memory comprising:

• a plastic substrate having flexibility;
• a memory element over the plastic substrate having flexibility, wherein the memory element is configured to memorize information on an electric signal transmitted to an inside of a living body, and wherein the memory element comprises a transistor, the transistor comprising:
• a first insulating film;
• a first electrode over the first insulating film;
• a second insulating film over the first insulating film and the first electrode;
• a semiconductor layer over the second insulating film, so as to overlap with the first electrode, wherein the semiconductor layer comprises a channel region, a first impurity region, and a second impurity region between the channel region and the first impurity region, and wherein a concentration of an impurity element in the second impurity region is lower than a concentration of the impurity element in the first impurity region;
• a third insulating film over the semiconductor layer;
• a second electrode over the third insulating film, so as to overlap with the semiconductor layer;
• a third electrode over the second electrode, wherein a width of the third electrode is shorter than a width of the second electrode in a channel length direction;
• a fourth insulating film over the third insulating film, second electrode and the third electrode;
• and
• a fourth electrode over the fourth insulating film, the fourth electrode electrically connected to the first impurity region through a contact hole in the third insulating film and the fourth insulating film;
• and
• an antenna configured to communicate with a biological signal processing unit located outside the wireless memory,
• wherein the wireless memory is configured to be attached to the living body, and
• wherein the memory element and the antenna are provided over the plastic substrate having flexibility with an adhesive agent interposed therebetween.

A biological signal processing system comprising:

• a biological signal processing unit comprising,
• an electrode and a first interface for transmitting an electric signal including first information to an inside of a living body,
• a first antenna configured to wirelessly communicate with a wireless memory configured to be attached to the living body;
• and
• a second interface comprising a rectification circuit;
• and
• the wireless memory comprising,
• a plastic substrate having flexibility;
• a memory element over the plastic substrate having flexibility, wherein the memory element is configured to memorize second information on the electric signal transmitted to the inside of the living body, and wherein the memory element comprises a transistor, the transistor comprising:
• a first insulating film;
• a first electrode over the first insulating film;
• a second insulating film over the first insulating film and the first electrode;
• a semiconductor layer over the second insulating film, so as to overlap with the first electrode, wherein the semiconductor layer comprises a channel region, a first impurity region, and a second impurity region between the channel region and the first impurity region, and wherein a concentration of an impurity element in the second impurity region is lower than a concentration of the impurity element in the first impurity region;
• a third insulating film over the semiconductor layer;
• a second electrode over the third insulating film, so as to overlap with the semiconductor layer;
• a third electrode over the second electrode, wherein a width of the third electrode is shorter than a width of the second electrode in a channel length direction;
• a fourth insulating film over the third insulating film, second electrode and the third electrode;
• and
• a fourth electrode over the fourth insulating film, the fourth electrode electrically connected to the first impurity region through a contact hole in the third insulating film and the fourth insulating film;
• and
• a second antenna over the plastic substrate having flexibility configured to wirelessly communicate with the biological signal processing unit,
• wherein the memory element and the second antenna are provided over the plastic substrate having flexibility with an adhesive agent interposed therebetween.

A control system of a device to be controlled comprising:

• a biological signal processing unit comprising:
• an electrode and a first interface for detecting an electric signal from an inside of a living body:
• a plastic substrate having flexibility;
• an antenna over the plastic substrate having flexibility, wherein the antenna is configured to wirelessly communicate with a reader/writer located outside of the living body;
• a second interface comprising a rectification circuit over the plastic substrate having flexibility;
• and
• a processor over the plastic substrate having flexibility, wherein the processor comprises a transistor electrically connected to the antenna, the transistor comprising:
• a first insulating film;
• a first electrode over the first insulating film;
• a second insulating film over the first insulating film and the first electrode;
• a semiconductor layer over the second insulating film, so as to overlap with the first electrode, wherein the semiconductor layer comprises a channel region, a first impurity region, and a second impurity region between the channel region and the first impurity region, and wherein a concentration of an impurity element in the second impurity region is lower than a concentration of the impurity element in the first impurity region;
• a third insulating film over the semiconductor layer;
• a second electrode over the third insulating film, so as to overlap with the semiconductor layer;
• a third electrode over the second electrode, wherein a width of the third electrode is shorter than a width of the second electrode in a channel length direction;
• a fourth insulating film over the third insulating film, second electrode and the third electrode;
• and
• a fourth electrode over the fourth insulating film, the fourth electrode electrically connected to the first impurity region through a contact hole in the third insulating film and the fourth insulating film,
• wherein the antenna and the processor are provided over the plastic substrate having flexibility with an adhesive agent interposed therebetween;
• the reader/writer configured to wirelessly communicate with the biological signal processing unit;
• and
• a device to be controlled connected to the reader/writer,
• wherein the device to be controlled can be controlled based on the electric signal, which is transmitted from the inside of the living body to the device to be controlled through the reader/writer.

A biological signal processing unit comprising:

• an electrode for at least one of detecting a biological signal from an inside of a living body and transmitting an electric signal to the inside of the living body;
• a plastic substrate having flexibility;
• an antenna over the plastic substrate having flexibility, wherein the antenna is configured to wirelessly communicate with a wireless memory configured to be attached to the living body, which is located outside the biological signal processing unit;
• an interface comprising a rectification circuit over the plastic substrate having flexibility;
• and
• a means for processing at least one of the biological signal and the electric signal provided between the electrode and the antenna and provided over the plastic substrate having flexibility,
• wherein the means comprises a transistor electrically connected to the antenna, the transistor comprising:
• a first insulating film;
• a first electrode over the first insulating film;
• a second insulating film over the first insulating film and the first electrode;
• a semiconductor layer over the second insulating film, so as to overlap with the first electrode, wherein the semiconductor layer comprises a channel region, a first impurity region, and a second impurity region between the channel region and the first impurity region, and wherein a concentration of an impurity element in the second impurity region is lower than a concentration of the impurity element in the first impurity region;
• a third insulating film over the semiconductor layer;
• a second electrode over the third insulating film, so as to overlap with the semiconductor layer;
• a third electrode over the second electrode, wherein a width of the third electrode is shorter than a width of the second electrode in a channel length direction;
• a fourth insulating film over the third insulating film, second electrode and the third electrode;
• and
• a fourth electrode over the fourth insulating film, the fourth electrode electrically connected to the first impurity region through a contact hole in the third insulating film and the fourth insulating film, and
• wherein the antenna and the means for processing at least one of the biological signal and the electric signal are provided over the plastic substrate having flexibility with an adhesive agent interposed therebetween.

A biological signal processing unit comprising:

• an electrode for transmitting an electric signal including information to an inside of a living body;
• a plastic substrate having flexibility;
• an antenna over the plastic substrate having flexibility, the antenna configured to wirelessly communicate with a reader/writer located outside of the living body;
• an interface comprising a rectification circuit over the plastic substrate having flexibility;
• and
• a means for processing at least one of a biological signal detected from the inside of the living body and the electric signal provided between the electrode and the antenna and provided over the plastic substrate having flexibility,
• wherein the means comprises a transistor electrically connected to the antenna, the transistor comprising:
• a first insulating film;
• a first electrode over the first insulating film;
• a second insulating film over the first insulating film and the first electrode;
• a semiconductor layer over the second insulating film, so as to overlap with the first electrode, wherein the semiconductor layer comprises a channel region, a first impurity region, and a second impurity region between the channel region and the first impurity region, and wherein a concentration of an impurity element in the second impurity region is lower than a concentration of the impurity element in the first impurity region;
• a third insulating film over the semiconductor layer;
• a second electrode over the third insulating film, so as to overlap with the semiconductor layer;
• a third electrode over the second electrode, wherein a width of the third electrode is shorter than a width of the second electrode in a channel length direction;
• a fourth insulating film over the third insulating film, second electrode and the third electrode;
• and
• a fourth electrode over the fourth insulating film, the fourth electrode electrically connected to the first impurity region through a contact hole in the third insulating film and the fourth insulating film, and
• wherein the antenna and the means for processing at least one of the biological signal and the electric signal are provided over the plastic substrate having flexibility with an adhesive agent interposed therebetween.