# US 11,122,660 B2 · Electronic device and light emitting unit driving circuit thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,122,660 B2 - Document ID: US11122660B2 - Status: Granted - Kind: B2 - Application number: 16/702,557 - Filed: 2019-12-04 - Published: 2020-07-09 - Granted: 2021-09-14 - Earliest claimed: 2019-01-08 - Assignees: Innolux Corporation - Applicants: InnoLux Corporation - Inventors: Chien-Hsueh Chiang; Tsau-Hua Hsieh - Web page: https://patentgrep.com/patent/US11122660B2 ## CPC - H05B 45/345: Current stabilisation; Maintaining constant current - H05B 45/44: with an active control inside an LED matrix - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - H05B 45/10: Controlling the intensity of the light - H10D 86/441: {Interconnections, e.g. scanning lines} - H10D 86/481: {integrated with passive devices, e.g. auxiliary capacitors} - H10D 86/60: wherein the TFTs are in active matrices - 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 2300/0852: being a dynamic memory with more than one capacitor - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - 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) - H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES ## Abstract An electronic device has a light emitting unit driving circuit. The driving circuit has a first driving transistor, a second driving transistor, and a light emitting unit. The first driving transistor has a first channel width and a first channel length and is used to provide a first current. The second driving transistor has a second channel width and a second channel length and is used to provide a second current. The light emitting unit is coupled to the first driving transistor and the second driving transistor for receiving at least one of the first current and the second current to emit light. A ratio of the first channel width to the first channel length is greater than a ratio of the second channel width to the second channel length. ## Claims ### Claim 1 A light emitting unit driving circuit, comprising: a first driving transistor having a first channel width and a first channel length and being configured to provide a first current; a second driving transistor having a second channel width and a second channel length and being configured to provide a second current; a light emitting unit electrically connected to the first driving transistor and the second driving transistor, and configured to receive at least one of the first current and the second current so as to emit light; a first light emitting control transistor electrically connected between the first driving transistor and the light emitting unit; and a second light emitting control transistor electrically connected between the second driving transistor and the light emitting unit; wherein a first ratio of the first channel width to the first channel length is different from a second ratio of the second channel width to the second channel length; and wherein when the first driving transistor and the second driving transistor are turned on, the first current and the second current flow through the light emitting unit, a magnitude of the first current is within a first current range, a magnitude of the second current is within a second current range, and the first current range does not overlap with the second current range. ### Claim 2 (depends on 1) The light emitting unit driving circuit of claim 1, further comprising: a first data line; a second data line; a first scan line; a second scan line; a first switching transistor electrically connected to the first data line, the first driving transistor, and the first scan line; and a second switching transistor electrically connected to the second data line, the second driving transistor, and the second scan line. ### Claim 3 (depends on 1) The light emitting unit driving circuit of claim 1, further comprising: a first data line; a second data line; a scan line; a first switching transistor electrically connected to the first data line, the first driving transistor, and the scan line; and a second switching transistor electrically connected to the second data line, the second driving transistor, and the scan line. ### Claim 4 (depends on 1) The light emitting unit driving circuit of claim 1, further comprising: a data line a first scan line; a second scan line; a first switching transistor electrically connected to the data line, the first driving transistor, and the first scan line; and a second switching transistor electrically connected to the data line, the second driving transistor, and the second scan line. ### Claim 5 (depends on 1) The light emitting unit driving circuit of claim 1, further comprising: a first capacitor electrically connected to the first driving transistor; and a second capacitor electrically connected to the second driving transistor. ### Claim 6 (depends on 5) The light emitting unit driving circuit of claim 5, wherein capacitance of the first capacitor is equal to the capacitance of the second capacitor. ### Claim 7 An electronic device comprising a light emitting unit driving circuit, and the light emitting unit driving circuit comprising: a first driving transistor having a first channel width and a first channel length and being configured to provide a first current; a second driving transistor having a second channel width and a second channel length and being configured to provide a second current; a light emitting unit electrically connected to the first driving transistor and the second driving transistor, and configured to receive at least one of the first current and the second current so as to emit light; a first light emitting control transistor electrically connected between the first driving transistor and the light emitting unit; and a second light emitting control transistor electrically connected between the second driving transistor and the light emitting unit; wherein a first ratio of the first channel width to the first channel length is different from a second ratio of the second channel width to the second channel length; and wherein when the first driving transistor and the second driving transistor are turned on, the first current and the second current flow through the light emitting unit, a magnitude of the first current is within a first current range, a magnitude of the second current is within a second current range, and the first current range does not overlap with the second current range. ### Claim 8 (depends on 7) The electronic device of claim 7, wherein the light emitting unit driving circuit further comprises: a first data line; a second data line; a first scan line; a second scan line; a first switching transistor electrically connected to the first data line, the first driving transistor, and the first scan line; and a second switching transistor electrically connected to the second data line, the second driving transistor, and the second scan line. ### Claim 9 (depends on 7) The electronic device of claim 7, wherein the light emitting unit driving circuit further comprises: a first data line; a second data line; a scan line a first switching transistor electrically connected to the first data line, the first driving transistor, and the scan line; and a second switching transistor electrically connected to the second data line, the second driving transistor, and the scan line. ### Claim 10 (depends on 7) The electronic device of claim 7, wherein the light emitting unit driving circuit further comprises: a data line a first scan line; a second scan line; a first switching transistor electrically connected to the data line, the first driving transistor, and the first scan line; and a second switching transistor electrically connected to the data line, the second driving transistor, and the second scan line. ### Claim 11 (depends on 7) The electronic device of claim 7, wherein the light emitting unit driving circuit further comprises: a first capacitor electrically connected to the first driving transistor; and a second capacitor electrically connected to the second driving transistor. ### Claim 12 (depends on 11) The electronic device of claim 11, wherein capacitance of the first capacitor is equal to the capacitance of the second capacitor.