# US 2014/0152387 A1 · Semiconductor device and electronic apparatus using the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0152387 A1 - Document ID: US20140152387A1 - Status: Published application - Kind: A1 - Application number: 14/176,676 - Filed: 2014-02-10 - Published: 2014-06-05 - Earliest claimed: 2003-01-16 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Hajime KIMURA; Yasuko WATANABE - Web page: https://patentgrep.com/patent/US20140152387A1 ## CPC - H03F 3/45179: {using MOSFET transistors as the active amplifying circuit (H03F3/45278 takes precedence)} - G11C 27/028: {Current mode circuits, e.g. switched current memories} - H03F 3/082: {with FET's (H03F3/085 takes precedence)} - H03F 3/45183: {Long tailed pairs (H03F3/4521, H03F3/45237 take precedence)} - H03K 19/00384: {in field effect transistor circuits} - H03F: AMPLIFIERS - G11C: STATIC STORES (semiconductor memory devices H10B) - H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M) ## 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. ## Claims ### Claim 1 (canceled) ### Claim 2 A semiconductor device comprising: a first transistor; a second transistor; a first capacitor; a second capacitor; a third capacitor; a first switch; a second switch; a third switch; a fourth switch; a fifth switch; a sixth switch; a seventh switch; an eighth switch; and a ninth switch, wherein the first transistor and the second transistor have the same polarity, wherein a gate of the first transistor is electrically connected to one terminal of the first capacitor and one terminal of the sixth switch, wherein the other terminal of the first capacitor is electrically connected to one terminal of the first switch and one terminal of the second switch, wherein the other terminal of the second switch is electrically connected to one of a source and a drain of the first transistor, one of a source and a drain of the second transistor, one terminal of the fourth switch, and one terminal of the eighth switch, wherein the other terminal of the eighth switch is electrically connected to one terminal of the third capacitor and one terminal of the ninth switch, wherein the other of the source and the drain of the first transistor is electrically connected to one terminal of the fifth switch, wherein the other terminal of the fourth switch is electrically connected to a gate of the second transistor and one terminal of the second capacitor, wherein the other terminal of the second capacitor is electrically connected to the other of the source and the drain of the second transistor, wherein the other of the source and the drain of the second transistor is electrically connected to a first power supply line, wherein one terminal of the third switch is electrically connected to one terminal of the seventh switch, wherein the other terminal of the first switch is electrically connected to an input terminal, and wherein the other terminal of the third switch is electrically connected to an output terminal. ### Claim 3 (depends on 2) The semiconductor device according to claim 2, wherein the other terminal of the sixth switch is electrically connected to the other of the source and the drain of the first transistor. ### Claim 4 (depends on 2) The semiconductor device according to claim 2, further comprising a tenth switch, wherein one terminal of the tenth switch is electrically connected to the other of the source and the drain of the first transistor. ### Claim 5 (depends on 2) The semiconductor device according to claim 2, further comprising a third power supply line electrically connected to the other of the source and the drain of the first transistor. ### Claim 6 (depends on 2) The semiconductor device according to claim 2, further comprising a current source electrically connected to the other of the source and the drain of the first transistor. ### Claim 7 (depends on 2) The semiconductor device according to claim 2, further comprising: a tenth switch; and a third power supply line, wherein one terminal of the tenth switch is electrically connected to the other of the source and the drain of the first transistor, and wherein the other terminal of the tenth switch is electrically connected to the third power supply line. ### Claim 8 (depends on 2) The semiconductor device according to claim 2, further comprising: a tenth switch; and a current source, wherein one terminal of the tenth switch is electrically connected to the other of the source and the drain of the first transistor, and wherein the other terminal of the tenth switch is electrically connected to the current source. ### Claim 9 (depends on 2) The semiconductor device according to claim 2, further comprising: a current source; and a third power supply line, wherein one terminal of the current source is electrically connected to the other of the source and the drain of the first transistor, and wherein the other terminal of the current source is electrically connected to the third power supply line. ### Claim 10 (depends on 2) The semiconductor device according to claim 2, further comprising: a tenth switch; a current source; and a third power supply line, wherein one terminal of the tenth switch is electrically connected to the other of the source and the drain of the first transistor, wherein the other terminal of the tenth switch is electrically connected to one terminal of the current source, and wherein the other terminal of the current source is electrically connected to the third power supply line. ### Claim 11 (depends on 2) The semiconductor device according to claim 2, wherein the other terminal of the fifth switch is electrically connected to a second power supply line. ### Claim 12 (depends on 2) The semiconductor device according to claim 2, wherein the other terminal of the seventh switch is electrically connected to a second power supply line. ### Claim 13 (depends on 2) The semiconductor device according to claim 2, further comprising a fourth transistor, wherein one of a source and a drain of the fourth transistor is electrically connected to a second power supply line, and wherein the other of the source and the drain of the fourth transistor is electrically connected to the other terminal of the fifth switch. ### Claim 14 (depends on 2) The semiconductor device according to claim 2, further comprising a fifth transistor, wherein one of a source and a drain of the fifth transistor is electrically connected to a second power supply line, and wherein the other of the source and the drain of the fifth transistor is electrically connected to the other terminal of the seventh switch. ### Claim 15 (depends on 2) The semiconductor device according to claim 2, further comprising a sixth transistor, wherein one of a source and a drain of the sixth transistor is electrically connected to the one terminal of the seventh switch, wherein the other of the source and the drain of the sixth transistor is electrically connected to the other terminal of the second switch and the one terminal of the eighth switch, and wherein a gate of the sixth transistor is electrically connected to the other terminal of the third capacitor. ### Claim 16 (depends on 2) The semiconductor device according to claim 2, wherein the other terminal of the ninth switch is electrically connected to a second input terminal. ### Claim 17 (depends on 2) The semiconductor device according to claim 2, wherein the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, the eighth switch and the ninth switch are each a transistor. ### Claim 18 (depends on 2) An electronic apparatus comprising the semiconductor device according to claim 2. ### Claim 19 A display device comprising: a pixel portion over a substrate; and a source follower circuit over the substrate, the source follower circuit comprising: a first transistor; a second transistor; a first capacitor; a second capacitor; a third capacitor; a first switch; a second switch; a third switch; a fourth switch; a fifth switch; a sixth switch; a seventh switch; an eighth switch; and a ninth switch, wherein the first transistor and the second transistor have the same polarity, wherein a gate of the first transistor is electrically connected to one terminal of the first capacitor and one terminal of the sixth switch, wherein the other terminal of the first capacitor is electrically connected to one terminal of the first switch and one terminal of the second switch, wherein the other terminal of the second switch is electrically connected to one of a source and a drain of the first transistor, one of a source and a drain of the second transistor, one terminal of the fourth switch, and one terminal of the eighth switch, wherein the other terminal of the eighth switch is electrically connected to one terminal of the third capacitor and one terminal of the ninth switch, wherein the other of the source and the drain of the first transistor is electrically connected to one terminal of the fifth switch, wherein the other terminal of the fourth switch is electrically connected to a gate of the second transistor and one terminal of the second capacitor, wherein the other terminal of the second capacitor is electrically connected to the other of the source and the drain of the second transistor, wherein the other of the source and the drain of the second transistor is electrically connected to a first power supply line, wherein one terminal of the third switch is electrically connected to one terminal of the seventh switch, wherein the other terminal of the first switch is electrically connected to an input terminal, wherein the other terminal of the third switch is electrically connected to an output terminal, wherein the pixel portion comprises a third transistor and a display element, wherein the third transistor is electrically connected to the display element, and wherein the source follower circuit is operationally connected to the pixel portion. ### Claim 20 (depends on 19) The display device according to claim 19, wherein the other terminal of the sixth switch is electrically connected to the other of the source and the drain of the first transistor. ### Claim 21 (depends on 19) The display device according to claim 19, further comprising a tenth switch, wherein one terminal of the tenth switch is electrically connected to the other of the source and the drain of the first transistor. ### Claim 22 (depends on 19) The display device according to claim 19, further comprising a third power supply line electrically connected to the other of the source and the drain of the first transistor. ### Claim 23 (depends on 19) The display device according to claim 19, further comprising a current source electrically connected to the other of the source and the drain of the first transistor. ### Claim 24 (depends on 19) The display device according to claim 19, further comprising: a tenth switch; and a third power supply line, wherein one terminal of the tenth switch is electrically connected to the other of the source and the drain of the first transistor, and wherein the other terminal of the tenth switch is electrically connected to the third power supply line. ### Claim 25 (depends on 19) The display device according to claim 19, further comprising: a tenth switch; and a current source, wherein one terminal of the tenth switch is electrically connected to the other of the source and the drain of the first transistor, and wherein the other terminal of the tenth switch is electrically connected to the current source. ### Claim 26 (depends on 19) The display device according to claim 19, further comprising: a current source; and a third power supply line, wherein one terminal of the current source is electrically connected to the other of the source and the drain of the first transistor, and wherein the other terminal of the current source is electrically connected to the third power supply line. ### Claim 27 (depends on 19) The display device according to claim 19, further comprising: a tenth switch; a current source; and a third power supply line, wherein one terminal of the tenth switch is electrically connected to the other of the source and the drain of the first transistor, wherein the other terminal of the tenth switch is electrically connected to one terminal of the current source, and wherein the other terminal of the current source is electrically connected to the third power supply line. ### Claim 28 (depends on 19) The display device according to claim 19, wherein the other terminal of the fifth switch is electrically connected to a second power supply line. ### Claim 29 (depends on 19) The display device according to claim 19, wherein the other terminal of the seventh switch is electrically connected to a second power supply line. ### Claim 30 (depends on 19) The display device according to claim 19, further comprising a fourth transistor, wherein one of a source and a drain of the fourth transistor is electrically connected to a second power supply line, and wherein the other of the source and the drain of the fourth transistor is electrically connected to the other terminal of the fifth switch. ### Claim 31 (depends on 19) The display device according to claim 19, further comprising a fifth transistor, wherein one of a source and a drain of the fifth transistor is electrically connected to a second power supply line, and wherein the other of the source and the drain of the fifth transistor is electrically connected to the other terminal of the seventh switch. ### Claim 32 (depends on 19) The display device according to claim 19, further comprising a sixth transistor, wherein one of a source and a drain of the sixth transistor is electrically connected to the one terminal of the seventh switch, wherein the other of the source and the drain of the sixth transistor is electrically connected to the other terminal of the second switch and the one terminal of the eighth switch, and wherein a gate of the sixth transistor is electrically connected to the other terminal of the third capacitor. ### Claim 33 (depends on 19) The display device according to claim 19, wherein the other terminal of the ninth switch is electrically connected to a second input terminal. ### Claim 34 (depends on 19) The display device according to claim 19, wherein the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, the eighth switch and the ninth switch are each a transistor. ### Claim 35 (depends on 19) A display module comprising: a FPC; and the display device according to claim 19. ### Claim 36 (depends on 35) An electronic apparatus comprising: the display module according to claim 35; and at least one of a speaker, an image receiving part, an external connection port, a battery, a sound input part, and a second capacitor antenna.