# US 11,443,689 B1 · Light-emitting element control circuit, display panel and display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,443,689 B1 - Document ID: US11443689B1 - Status: Granted - Kind: B1 - Application number: 17/363,679 - Filed: 2021-06-30 - Published: 2022-08-25 - Granted: 2022-09-13 - Earliest claimed: 2021-02-20 - Assignees: Xiamen Tianma Micro-Electronics Co., Ltd. - Applicants: Xiamen Tianma Micro-Electronics Co., Ltd. - Inventors: Yingteng Zhai - Web page: https://patentgrep.com/patent/US11443689B1 ## CPC - G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED] - G09G 2320/0233: Improving the luminance or brightness uniformity across the screen - G09G 2320/064: by time modulation of the brightness of the illumination source - G09G 2330/02: Details of power systems and of start or stop of display operation - G09G 2330/021: Power management, e.g. power saving - 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) ## Abstract Provided is a light-emitting element control circuit, a display panel and a display device. The light-emitting element control circuit includes a current source and at least one light-emitting unit, and the at least one light-emitting unit is connected in series to the current source. The at least one light-emitting unit each includes a first branch and a second branch which are connected in parallel. The first branch includes a first gating unit and a light-emitting element which are connected in series, and the second branch includes a second gating unit. The light-emitting element control circuit provided by the present application enables the current provided by the current source to pass through one of the first branch and the second branch in an active-selection mode, and meanwhile generation of photo-generated carriers in the light-emitting element can be avoided, thereby improving the display effect. ## Claims ### Claim 1 A light-emitting element control circuit, comprising: a current source and at least one light-emitting unit; wherein the at least one light-emitting unit is connected in series to the current source; and the at least one light-emitting unit each comprises a first branch and a second branch, wherein the first branch and the second branch are connected in parallel, and wherein the first branch comprises a first gating unit and a light-emitting element connected in series to the first gating unit, and the second branch comprises a second gating unit, wherein one of the first gating unit and the second gating unit is an N-type transistor and the other one of the first gating unit and the second gating unit is a P-type transistor, and a control terminal of the N-type transistor is electrically connected to a control terminal of the P-type transistor. ### Claim 2 (depends on 1) The light-emitting element control circuit of claim 1, wherein in response to the first gating unit being in an on state, the second gating unit is in an off state; and in response to the second gating unit being in an on state, the first gating unit is in an off state. ### Claim 3 (depends on 2) The light-emitting element control circuit of claim 2, wherein the at least one light-emitting unit further comprises an inverter, and a control terminal of the first gating unit is electrically connected to a control terminal of the second gating unit through the inverter. ### Claim 4 (depends on 1) The light-emitting element control circuit of claim 1, wherein the at least one light-emitting unit further comprises a pulse-width modulation unit, and the pulse-width modulation unit is electrically connected to the first gating unit and the second gating unit separately. ### Claim 5 (depends on 4) The light-emitting element control circuit of claim 4, wherein the pulse-width modulation unit is configured to receive a data signal and output a pulse-width modulation signal corresponding to the data signal. ### Claim 6 (depends on 1) The light-emitting element control circuit of claim 1, wherein at least two light-emitting units are provided and connected in series. ### Claim 7 (depends on 6) The light-emitting element control circuit of claim 6, wherein light-emitting colors of light-emitting elements in the at least two light-emitting units are different. ### Claim 8 (depends on 1) The light-emitting element control circuit of claim 1, wherein the current source and the at least one light-emitting unit are connected in series between a first power supply terminal and a second power supply terminal, and a voltage of the first power supply terminal is higher than a voltage of the second power supply terminal. ### Claim 9 (depends on 1) The light-emitting element control circuit of claim 1, comprising a microcontroller, wherein the current source and components other than the light-emitting element in the at least one light-emitting unit are integrated in the microcontroller; and the microcontroller is electrically connected to the light-emitting element. ### Claim 10 (depends on 9) The light-emitting element control circuit of claim 9, further comprising a global gating unit and a global control signal unit; wherein the global gating unit is connected in series between the current source and the at least one light-emitting unit; the global control signal unit is electrically connected to a control terminal of the global gating unit; and the global gating unit and the global control signal unit are integrated into the microcontroller. ### Claim 11 (depends on 9) The light-emitting element control circuit of claim 9, wherein the current source and the at least one light-emitting unit are connected in series between a first power supply terminal and a second power supply terminal, and a voltage of the first power supply terminal is higher than a voltage of the second power supply terminal, and the microcontroller is further electrically connected to the first power supply terminal and the second power supply terminal. ### Claim 12 (depends on 1) The light-emitting element control circuit of claim 1, wherein at least one of the first gating unit and the second gating unit comprises a gating transistor, the gating transistor comprises an active layer and a first gate and a second gate respectively located on opposite sides of the active layer, and the first gate is electrically connected to the second gate. ### Claim 13 A light-emitting element control circuit, comprising: a current source and at least one light-emitting unit; wherein the at least one light-emitting unit is connected in series to the current source; and the at least one light-emitting unit each comprises a first branch and a second branch, wherein the first branch and the second branch are connected in parallel, and wherein the first branch comprises a first gating unit and a light-emitting element connected in series to the first gating unit, and the second branch comprises a second gating unit, wherein the light-emitting element control circuit further comprising a global gating unit connected in series between the current source and the at least one light-emitting unit, wherein the light-emitting element control circuit further comprising a global control signal unit, wherein the global control signal unit is electrically connected to a control terminal of the global gating unit, wherein the global control signal unit comprises a global pulse-width modulation unit, and a time period of an enable signal output by the global pulse-width modulation unit covers a preset light-emitting time period of a light-emitting element of each light-emitting unit of the at least one light-emitting unit connected in series to the current source in terms of time. ### Claim 14 A light-emitting element control circuit, comprising: a current source and at least one light-emitting unit; wherein the at least one light-emitting unit is connected in series to the current source; and the at least one light-emitting unit each comprises a first branch and a second branch, wherein the first branch and the second branch are connected in parallel, and wherein the first branch comprises a first gating unit and a light-emitting element connected in series to the first gating unit, and the second branch comprises a second gating unit, wherein the light-emitting element control circuit further comprising a global gating unit connected in series between the current source and the at least one light-emitting unit, wherein the light-emitting element control circuit further comprising a global control signal unit, wherein the global control signal unit is electrically connected to a control terminal of the global gating unit, wherein the global control signal unit comprises an OR gate, the OR gate comprises at least two input terminals and one output terminal, the at least two input terminals of the OR gate receive a signal received by a control terminal of a first gating unit of the each light-emitting unit connected in series to the current source, and the output terminal of the OR gate outputs a signal obtained after an OR operation is performed on the signal received by the at least two input terminals of the OR gate; and the output terminal of the OR gate is electrically connected to the control terminal of the global gating unit. ### Claim 15 A display panel, comprising a light-emitting element control circuit, wherein the light-emitting element control circuit comprises: a current source and at least one light-emitting unit; wherein the at least one light-emitting unit is connected in series to the current source; and the at least one light-emitting unit each comprises a first branch and a second branch, wherein the first branch and the second branch are connected in parallel, and wherein the first branch comprises a first gating unit and a light-emitting element connected in series to the first gating unit, and the second branch comprises a second gating unit, wherein one of the first gating unit and the second gating unit is an N-type transistor and the other one of the first gating unit and the second gating unit is a P-type transistor, and a control terminal of the N-type transistor is electrically connected to a control terminal of the P-type transistor. ### Claim 16 (depends on 15) The display panel of claim 15, further comprising a scanning driver circuit and a data driver circuit; wherein the light-emitting element control circuit is electrically connected to the scanning driver circuit through a scanning signal line and electrically connected to the data driver circuit through a data signal line. ### Claim 17 (depends on 15) A display device, comprising the display panel of claim 15.