Portable electronic device
First Claim
Patent Images
1. A portable electronic device comprising:
- a display portion including a first transistor, a channel region of the first transistor comprising a first oxide semiconductor;
a power source portion comprising a rechargeable battery capable of charge by contactless charge; and
a signal processing portion comprising a semiconductor memory device, the semiconductor memory device comprising;
a second transistor, a channel region of the second transistor comprising crystalline silicon;
a third transistor, a channel region of the third transistor comprising a second oxide semiconductor;
a capacitor;
a source line;
a bit line;
a first signal line;
a second signal line; and
a word line,wherein a gate of the second transistor is electrically connected to one of a source and a drain of the third transistor, a source of the second transistor is electrically connected to the source line, and a drain of the second transistor is electrically connected to the bit line,wherein a gate of the third transistor is electrically connected to the second signal line, the one of the source and the drain of the third transistor is electrically connected to a first electrode of the capacitor, and the other of the source and the drain of the third transistor is electrically connected to the first signal line, andwherein the second oxide semiconductor in the channel region of the third transistor has an off-state current of lower than or equal to 1 aA/μ
m.
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Abstract
A portable electronic device that can operate even when electric power supplied through contactless charge by electromagnetic induction is low is provided. The portable electronic device includes a reflective liquid crystal display which includes a transistor including an oxide semiconductor, a power source portion which includes a rechargeable battery capable of charge by contactless charge, and a signal processing portion which includes a nonvolatile semiconductor memory device. In the portable electronic device, electric power stored in the rechargeable battery is used in the reflective liquid crystal display and the signal processing portion.
118 Citations
21 Claims
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1. A portable electronic device comprising:
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a display portion including a first transistor, a channel region of the first transistor comprising a first oxide semiconductor; a power source portion comprising a rechargeable battery capable of charge by contactless charge; and a signal processing portion comprising a semiconductor memory device, the semiconductor memory device comprising; a second transistor, a channel region of the second transistor comprising crystalline silicon; a third transistor, a channel region of the third transistor comprising a second oxide semiconductor; a capacitor; a source line; a bit line; a first signal line; a second signal line; and a word line, wherein a gate of the second transistor is electrically connected to one of a source and a drain of the third transistor, a source of the second transistor is electrically connected to the source line, and a drain of the second transistor is electrically connected to the bit line, wherein a gate of the third transistor is electrically connected to the second signal line, the one of the source and the drain of the third transistor is electrically connected to a first electrode of the capacitor, and the other of the source and the drain of the third transistor is electrically connected to the first signal line, and wherein the second oxide semiconductor in the channel region of the third transistor has an off-state current of lower than or equal to 1 aA/μ
m. - View Dependent Claims (2, 3, 4, 5, 6, 7, 19, 21)
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8. A portable electronic device comprising:
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a display portion including a first transistor, a channel region of the first transistor comprising a first oxide semiconductor; a power source portion comprising a rechargeable battery capable of charge by contactless charge; and a signal processing portion comprising a semiconductor memory device, the semiconductor memory device comprising; a second transistor, a channel region of the second transistor comprising crystalline silicon; a third transistor, a channel region of the third transistor comprising a second oxide semiconductor; a capacitor; and first to fifth wirings, wherein a first terminal of the second transistor is electrically connected to the first wiring, a second terminal of the second transistor is electrically connected to the second wiring, and a gate of the second transistor is electrically connected to a first terminal of the third transistor or one electrode of the capacitor, wherein a second terminal of the third transistor is electrically connected to the third wiring, and a gate of the third transistor is electrically connected to the fourth wiring, wherein the other electrode of the capacitor is electrically connected to the fifth wiring, and wherein the second oxide semiconductor in the channel region of the third transistor has an off-state current of lower than or equal to 1 aA/μ
m. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20)
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Specification
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Current AssigneeSemiconductor Energy Laboratory Co., Ltd.
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Original AssigneeSemiconductor Energy Laboratory Co., Ltd.
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InventorsYamazaki, Shunpei, Koyama, Jun
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Primary Examiner(s)Gandhi, Jayprakash N
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Assistant Examiner(s)PATEL, MUKUNDBHAI G
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Application NumberUS13/005,775Publication NumberTime in Patent Office1,335 DaysField of Search361/679.01, 361/784, 361/748, 320/108US Class Current361/679.01CPC Class CodesG06F 1/1626 with a single-body enclosur...G06F 1/1635 Details related to the inte...G06F 1/1637 Details related to the disp...G06F 1/263 Arrangements for using mult...G11C 5/063 Voltage and signal distribu...H01L 29/786 Thin film transistors, i.e....
