# US 2021/0242292 A1 · Light emitting apparatus, imaging apparatus, electronic apparatus, illumination apparatus, and mobile apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0242292 A1 - Document ID: US20210242292A1 - Status: Published application - Kind: A1 - Application number: 17/160,852 - Filed: 2021-01-28 - Published: 2021-08-05 - Earliest claimed: 2020-01-30 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Hiromasa Tsuboi - Web page: https://patentgrep.com/patent/US20210242292A1 ## CPC - F21S 43/145: Surface emitters, e.g. organic light emitting diodes [OLED] - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - H04N 23/53: of electronic viewfinders, e.g. rotatable or detachable - H10D 30/601: {having lightly-doped drain or source extensions, e.g. LDD IGFETs or DDD IGFETs (lightly doped source or drain extensions for TFTs H10D30/6715)} - H10K 59/1216: {the pixel elements being capacitors} - B60Q 1/30: for indicating rear of vehicle, e.g. by means of reflecting surfaces - B60Q 1/44: for indicating braking action {or preparation for braking, e.g. by detection of the foot approaching the brake pedal} - G09G 2230/00: Details of flat display driving waveforms - G09G 2300/0426: Layout of electrodes and connections - G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing - G09G 2300/0861: with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes - G09G 2310/0262: The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes - G09G 2310/061: for resetting or blanking - G09G 2310/067: Special waveforms for scanning, where no circuit details of the gate driver are given - G09G 2320/045: Compensation of drifts in the characteristics of light emitting or modulating elements - H10D 30/603: {having asymmetry in the channel direction, e.g. lateral high-voltage MISFETs having drain offset region or extended drain IGFETs [EDMOS]} - H10K 59/35: comprising red-green-blue [RGB] subpixels - F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS - 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) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - B60Q: ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL ## Abstract A light emitting apparatus comprising a plurality of pixels with different light emitting colors, each of the plurality of pixels includes a light-emitting element configured to emit light with one of at least three different light emitting colors, a driving transistor configured to supply a current to the light-emitting element in accordance with a voltage supplied to a gate, a write transistor configured to supply a signal voltage from a signal line to the gate of the driving transistor, and a capacitance at a connection portion between the driving transistor and the write transistor, wherein the capacitance is different for each light emitting color, and is larger in a pixel of a light emitting color in which a peak current flowing through the light-emitting element is larger. ## Claims ### Claim 1 A light emitting apparatus comprising: a plurality of pixels with different light emitting colors, each of the plurality of pixels includes a light-emitting element configured to emit light with one of at least three different light emitting colors, a driving transistor configured to supply a current to the light-emitting element in accordance with a voltage supplied to a gate, a write transistor configured to supply a signal voltage from a signal line to the gate of the driving transistor, and a capacitance at a connection portion between the driving transistor and the write transistor, wherein the capacitance is different for each light emitting color, and is larger in a pixel of a light emitting color in which a peak current flowing through the light-emitting element is larger. ### Claim 2 (depends on 1) The apparatus according to claim 1, wherein the capacitance includes a first capacitive element connected to the gate of the driving transistor. ### Claim 3 (depends on 2) The apparatus according to claim 2, wherein the first capacitive element is formed by overlapping a wiring connected to at least one of a source and a drain of the driving transistor with the gate of the driving transistor in a planar view. ### Claim 4 (depends on 2) The apparatus according to claim 2, wherein the first capacitive element has a MIM (Metal-Insulator-Metal) structure. ### Claim 5 (depends on 1) The apparatus according to claim 1, wherein the capacitance at the connection portion includes a parasitic capacitance of the driving transistor. ### Claim 6 (depends on 1) The apparatus according to claim 1, wherein an impurity density of at least one of a source and a drain of the driving transistor is set for each light emitting color. ### Claim 7 (depends on 1) The apparatus according to claim 1, wherein the driving transistor has an LDD structure, and a length along a direction in which a current flows in a portion, formed with a lower impurity density, of the LDD structure is set for each light emitting color. ### Claim 8 (depends on 1) The apparatus according to claim 1, further comprising a second capacitive element configured to hold a threshold voltage of the driving transistor when a threshold compensation voltage is supplied to the gate of the driving transistor, wherein the threshold voltage of the driving transistor is compensated by a threshold voltage held in the second capacitive element. ### Claim 9 (depends on 8) The apparatus according to claim 8, wherein the second capacitive element has a MIM (Metal-Insulator-Metal) structure. ### Claim 10 (depends on 8) The apparatus according to claim 8, wherein the threshold compensation voltage is set for each light emitting color. ### Claim 11 (depends on 1) The apparatus according to claim 1, wherein a light emission control transistor is further connected between the driving transistor and a power supply. ### Claim 12 (depends on 11) The apparatus according to claim 11, wherein a third capacitive element is further connected between a source and a drain of the light emission control transistor, and a value of the third capacitive element is set for each light emitting color. ### Claim 13 (depends on 12) The apparatus according to claim 12, wherein the third capacitive element has a MIM (Metal-Insulator-Metal) structure. ### Claim 14 (depends on 1) The apparatus according to claim 1, further comprising a reset transistor connected between an anode of the light-emitting element and a reference potential, wherein the reset transistor is controlled to be ON state during a period in which the light-emitting element is set in a non-light emission state. ### Claim 15 A light emitting apparatus comprising: a first light-emitting element, and a second light-emitting element whose magnitude of a peak current is larger than that of the first light-emitting element, wherein the first light-emitting element includes a first driving transistor configured to supply a current to the first light-emitting element in accordance with a voltage supplied to a gate, and a first capacitance connected to the gate of the first driving transistor, the second light-emitting element includes a second driving transistor configured to supply a current to the second light-emitting element in accordance with a voltage supplied to a gate, and a second capacitance connected to the gate of the second driving transistor, and the second capacitance has a capacitance value different from a capacitance value of the first capacitance so that the current flowing through the second light-emitting element is larger than the current flowing through the first light-emitting element when the first light-emitting element and the second light-emitting element receive the same luminance signal. ### Claim 16 (depends on 15) The apparatus according to claim 15, wherein the first capacitance includes a first capacitive element connected to the gate of the first driving transistor. ### Claim 17 (depends on 15) The apparatus according to claim 15, wherein the first light-emitting element includes a third capacitance connected between the gate of the first driving transistor and a power supply potential, the second light-emitting element includes a fourth capacitance connected between the gate of the second driving transistor and the power supply potential, and the third capacitance and the fourth capacitance have different capacitance values. ### Claim 18 (depends on 1) An imaging apparatus comprising an optical unit including a plurality of lenses, an imaging element configured to receive light having passed through the optical unit, and a display unit configured to display an image captured by the imaging element, wherein the display unit includes a light emitting apparatus defined in claim 1. ### Claim 19 (depends on 1) An electronic apparatus comprising a display unit including a light emitting apparatus defined in claim 1, a housing provided with the display unit, and a communication unit provided in the housing and configured to communicate with an external device. ### Claim 20 (depends on 1) An illumination apparatus comprising a light source including a light emitting apparatus defined in claim 1, and at least one of a light-diffusing unit and an optical film that transmits light emitted by the light source. ### Claim 21 (depends on 1) A mobile apparatus comprising a lighting appliance including a light emitting apparatus defined in claim 1, and a main body provided with the lighting appliance.