# US 12,001,241 B2 · Portable electronic device having transistor comprising oxide semiconductor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,001,241 B2 - Document ID: US12001241B2 - Status: Granted - Kind: B2 - Application number: 18/082,679 - Filed: 2022-12-16 - Published: 2023-04-20 - Granted: 2024-06-04 - Earliest claimed: 2010-01-20 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Shunpei Yamazaki; Jun Koyama - Web page: https://patentgrep.com/patent/US12001241B2 ## CPC - G06F 1/1635: {Details related to the integration of battery packs and other power supplies such as fuel cells or integrated AC adapter} - G06F 1/1626: {with a single-body enclosure integrating a flat display, e.g. Personal Digital Assistants [PDAs]} - G06F 1/1637: {Details related to the display arrangement, including those related to the mounting of the display in the housing} - G06F 1/263: {Arrangements for using multiple switchable power supplies, e.g. battery and AC (G06F1/30 takes precedence)} - G11C 5/063: {Voltage and signal distribution in integrated semi-conductor memory access lines, e.g. word-line, bit-line, cross-over resistance, propagation delay} - H10D 30/67: Thin-film transistors [TFT] {(Stacked nanowire, nanosheet or nanoribbon FETs H10D30/501)} - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G11C: STATIC STORES (semiconductor memory devices H10B) - H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES ## 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. ## Claims ### Claim 1 An electronic device comprising: a display; a first antenna; a second antenna; a memory; and a rechargeable battery, wherein the first antenna is capable of receiving electric power by contactless charge, wherein the rechargeable battery is capable of storing the electric power received by the first antenna, wherein the second antenna is capable of receiving data, wherein the memory comprises a first transistor, a second transistor and a capacitor, wherein a gate of the second transistor is electrically connected to one of a source and a drain of the first transistor and one terminal of the capacitor, wherein the first transistor comprises an oxide semiconductor, and wherein the second transistor comprises silicon. ### Claim 2 (depends on 1) The electronic device according to claim 1, wherein the oxide semiconductor comprises In, Ga, and Zn. ### Claim 3 (depends on 1) The electronic device according to claim 1, further comprising a driver circuit and a display controller electrically connected to the display, wherein operation of the driver circuit and the display controller is stopped during a holding period after writing an image signal to the display. ### Claim 4 (depends on 1) The electronic device according to claim 1, wherein the display comprises a liquid crystal display device. ### Claim 5 (depends on 1) The electronic device according to claim 1, wherein the display comprises an electrophoretic display. ### Claim 6 (depends on 1) The electronic device according to claim 1, wherein the memory is capable of storing the data received by the second antenna. ### Claim 7 An electronic device comprising: a display; a first antenna; a second antenna; a memory; and a rechargeable battery, wherein the first antenna is capable of receiving electric power by electromagnetic induction, wherein the rechargeable battery is capable of storing the electric power received by the first antenna, wherein the second antenna is capable of receiving data, wherein the memory comprises a first transistor, a second transistor and a capacitor, wherein a gate of the second transistor is electrically connected to one of a source and a drain of the first transistor and one terminal of the capacitor, wherein the first transistor comprises an oxide semiconductor, and wherein the second transistor comprises silicon. ### Claim 8 (depends on 7) The electronic device according to claim 7, wherein the oxide semiconductor comprises In, Ga, and Zn. ### Claim 9 (depends on 7) The electronic device according to claim 7, further comprising a driver circuit and a display controller electrically connected to the display, wherein operation of the driver circuit and the display controller is stopped during a holding period after writing an image signal to the display. ### Claim 10 (depends on 7) The electronic device according to claim 7, wherein the display comprises a liquid crystal display device. ### Claim 11 (depends on 7) The electronic device according to claim 7, wherein the display comprises an electrophoretic display. ### Claim 12 (depends on 7) The electronic device according to claim 7, wherein the memory is capable of storing the data received by the second antenna. ### Claim 13 An electronic device comprising: a display; a first antenna; a second antenna; a memory; a rectifier circuit; and a rechargeable battery, wherein the first antenna is electrically connected to the rectifier circuit, wherein the rectifier circuit is electrically connected to the rechargeable battery, wherein the first antenna is capable of receiving electric power by electromagnetic induction, wherein the rechargeable battery is capable of storing the electric power received by the first antenna, wherein the second antenna is capable of receiving data, wherein the memory comprises a first transistor, a second transistor and a capacitor, wherein a gate of the second transistor is electrically connected to one of a source and a drain of the first transistor and one terminal of the capacitor, wherein the first transistor comprises an oxide semiconductor, and wherein the second transistor comprises silicon. ### Claim 14 (depends on 13) The electronic device according to claim 13, wherein the oxide semiconductor comprises In, Ga, and Zn. ### Claim 15 (depends on 13) The electronic device according to claim 13, further comprising a driver circuit and a display controller electrically connected to the display, wherein operation of the driver circuit and the display controller is stopped during a holding period after writing an image signal to the display. ### Claim 16 (depends on 13) The electronic device according to claim 13, wherein the display comprises a liquid crystal display device. ### Claim 17 (depends on 13) The electronic device according to claim 13, wherein the display comprises an electrophoretic display. ### Claim 18 (depends on 13) The electronic device according to claim 13, wherein the memory is capable of storing the data received by the second antenna.