# US 2017/0256207 A1 · Semiconductor device, display panel, and electronic device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0256207 A1 - Document ID: US20170256207A1 - Status: Published application - Kind: A1 - Application number: 15/447,723 - Filed: 2017-03-02 - Published: 2017-09-07 - Earliest claimed: 2016-03-04 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Kei TAKAHASHI - Web page: https://patentgrep.com/patent/US20170256207A1 ## CPC - G09G 3/3291: in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements - G06F 3/041: Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G06F 3/04164: {Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads} - G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes} - G09G 2300/0452: Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components - G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing - G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor - G09G 2310/0291: Details of output amplifiers or buffers arranged for use in a driving circuit - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/0233: Improving the luminance or brightness uniformity across the screen - G09G 2320/0295: by monitoring each display pixel - G09G 2320/045: Compensation of drifts in the characteristics of light emitting or modulating elements - H03K 3/03: Astable circuits - H03K 3/037: Bistable circuits - H03K 4/50: in which a sawtooth voltage is produced across a capacitor - H03K 21/02: Input circuits - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - 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 A semiconductor device capable of current detection accurately is provided. The semiconductor device includes an error amplifier, a voltage controlled oscillator (VCO), a counter, a first circuit, and a terminal. The terminal is electrically connected to a non-inverting input terminal of the error amplifier. An inverting input terminal of the error amplifier is supplied with first voltage. An output terminal of the error amplifier is electrically connected to the VCO. An output terminal of the VCO is electrically connected to the counter. The first circuit is electrically connected to the output terminal of the VCO and the terminal. The circuit supplies current in accordance with the frequency of a signal output from the VCO. ## Claims ### Claim 1 A semiconductor device comprising: an error amplifier; a voltage controlled oscillator; a counter; a first circuit; and a terminal, wherein the terminal is electrically connected to a non-inverting input terminal of the error amplifier, wherein an inverting input terminal of the error amplifier is supplied with first voltage, wherein an output terminal of the error amplifier is electrically connected to an input terminal of the voltage controlled oscillator, wherein an output terminal of the voltage controlled oscillator is electrically connected to the counter, wherein the first circuit is electrically connected to the output terminal of the voltage controlled oscillator and the terminal, wherein the first circuit is configured to supply current through the terminal in accordance with a frequency of a signal output from the voltage controlled oscillator, and wherein the counter is configured to count the number of pulses of the signal and outputting the number of the pulses. ### Claim 2 (depends on 1) A display panel comprising the semiconductor device according to claim 1, wherein current flowing through a pixel is detected using the semiconductor device, and wherein display data is compensated in accordance with the current flowing through the pixel. ### Claim 3 (depends on 1) A semiconductor wafer comprising the semiconductor device according to claim 1, further comprising a separation region. ### Claim 4 A semiconductor device comprising: an error amplifier; a voltage controlled oscillator; a counter; a first circuit; and a terminal, wherein the terminal is electrically connected to a non-inverting input terminal of the error amplifier, wherein an inverting input terminal of the error amplifier is supplied with first voltage, wherein an output terminal of the error amplifier is electrically connected to an input terminal of the voltage controlled oscillator, wherein an output terminal of the voltage controlled oscillator is electrically connected to the counter, wherein the first circuit is electrically connected to the output terminal of the voltage controlled oscillator and the terminal, wherein the first circuit is configured to supply current through the terminal in accordance with a frequency of a signal output from the voltage controlled oscillator, wherein the counter is configured to count the number of pulses of the signal and outputting the number of the pulses, wherein the first circuit comprises a second circuit, a first switch, a second switch, and a capacitor, wherein the first switch is configured to control electrical continuity between the terminal and a first terminal of the capacitor, wherein the second switch is configured to control electrical continuity between the first terminal of the capacitor and a second terminal of the capacitor, wherein the second circuit is configured to control on and off states of the first switch and the second switch, wherein the second switch is off when the first switch is on, and wherein the first switch is off when the second switch is on. ### Claim 5 (depends on 4) A display panel comprising the semiconductor device according to claim 4, wherein current flowing through a pixel is detected using the semiconductor device, and wherein display data is compensated in accordance with the current flowing through the pixel. ### Claim 6 (depends on 4) A display module comprising the display panel according to claim 4 and a touch panel. ### Claim 7 (depends on 4) An electronic device comprising the display panel according to claim 4, further comprising at least one of an operation button, a speaker, and a microphone. ### Claim 8 (depends on 4) A semiconductor wafer comprising the semiconductor device according to claim 4, further comprising a separation region.