# US 11,908,403 B2 · Driving circuit of light-emitting device, backlight module and display panel > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,908,403 B2 - Document ID: US11908403B2 - Status: Granted - Kind: B2 - Application number: 17/281,102 - Filed: 2021-03-15 - Published: 2023-12-28 - Granted: 2024-02-20 - Earliest claimed: 2021-03-08 - Assignees: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. - Applicants: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. - Inventors: Bin Liu; Quansheng Liu - Web page: https://patentgrep.com/patent/US11908403B2 ## CPC - G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED] - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 3/3208: organic, e.g. using organic light-emitting diodes [OLED] - G09G 3/3266: Details of drivers for scan electrodes - G09G 3/3406: {Control of illumination source (illumination devices structurally associated with liquid crystal cells G02F1/1336)} - 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 2300/0861: 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 2310/0251: Precharge or discharge of pixel before applying new pixel voltage - 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 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/0233: Improving the luminance or brightness uniformity across the screen - G09G 2320/0261: in the context of movement of objects on the screen or movement of the observer relative to the screen - G09G 2320/045: Compensation of drifts in the characteristics of light emitting or modulating elements - G09G 2320/0626: for control of overall brightness - Y02B 20/30: Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED] - 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) - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract A driving circuit of a light-emitting device, a backlight module and a display panel are disclosed in the present disclosure. The driving circuit of the light-emitting device includes a light-emitting device, a driving transistor, a data signal writing module, a first power signal writing module, a second power signal writing module, a light-emitting control module, and a storage module. ## Claims ### Claim 1 A driving circuit of a light-emitting device, comprising: a light-emitting device, connected in series to a light-emitting circuit formed by a first power signal and a second power signal; a driving transistor, wherein a source and a drain of the driving transistor are connected in series to the light-emitting circuit, and the driving transistor is configured to control a current flowing through the light-emitting circuit; a data signal writing module, receiving a first scan signal and a data signal, and electrically connected to one of the source and the drain of the driving transistor, wherein the data signal writing module is configured to write the data signal to one of the source and the drain of the driving transistor under control of the first scan signal; a first power signal writing module, receiving a second scan signal and the first power signal, and electrically connected to a gate of the driving transistor, wherein the first power signal writing module is configured to write the first power signal into the gate of the driving transistor under control of the second scan signal; a second power signal writing module, receiving a third scan signal and the second power signal, and electrically connected to the gate of the driving transistor, wherein the second power signal writing module is configured to write the second power signal into the gate of the driving transistor under control of the third scan signal; a light-emitting control module, receiving a light-emitting control signal and connected in series to the light-emitting circuit, wherein the light-emitting control module is configured to control the light-emitting circuit to be turned on or to be turned off based on the light-emitting control signal; and a storage module, electrically connected to the gate of the driving transistor and receiving the second power signal, wherein the storage module is configured to store a potential of the gate of the driving transistor. ### Claim 2 (depends on 1) The driving circuit of the light-emitting device of claim 1, wherein the driving circuit of the light-emitting device further comprises a compensation module, receiving a fourth scan signal, and electrically connected to the other of the source and the drain of the driving transistor and the gate of the driving transistor, wherein the compensation module is configured to compensate a threshold voltage of the driving transistor under control of the fourth scan signal. ### Claim 3 (depends on 2) The driving circuit of the light-emitting device of claim 2, wherein the compensation module includes a first transistor, a gate of the first transistor receives the fourth scan signal, one of a source and a drain of the first transistor is electrically connected to the gate of the driving transistor, and the other of the source and the drain of the first transistor is electrically connected to one of the source and the drain of the driving transistor. ### Claim 4 (depends on 1) The driving circuit of the light-emitting device of claim 1, wherein the light-emitting control module includes: a first light-emitting control unit, receiving the light-emitting control signal, and connected in series to the light-emitting circuit, wherein the first light-emitting control unit is configured to control the light-emitting circuit to be turned on or to be turned off under control of the light-emitting control signal; and/or a second light-emitting control unit, receiving the light-emitting control signal, and connected in series to the light-emitting circuit, wherein the second light-emitting control unit is configured to control the light-emitting circuit to be turned on or to be turned off under control of the light-emitting control signal. ### Claim 5 (depends on 4) The driving circuit of the light-emitting device of claim 4, wherein the light-emitting control module includes the first light-emitting control unit and the second light-emitting control unit, the first light-emitting control unit includes a second transistor, and the second light-emitting control unit includes a third transistor; wherein a gate of the second transistor and a gate of the third transistor both receive the light-emitting control signal, one of a source and a drain of the second transistor is electrically connected to one end of the light-emitting device, and the other of the source and the drain of the second transistor is electrically connected to one of the source and the drain of the driving transistor; wherein one of a source and a drain of the third transistor receives the second power signal, and the other of the source and the drain of the third transistor is electrically connected to the other of the source and the drain of the driving transistor. ### Claim 6 (depends on 1) The driving circuit of the light-emitting device of claim 1, wherein the data signal writing module includes a fourth transistor, a gate of the fourth transistor receives the first scan signal, one of a source and a drain of the fourth transistor receives the data signal, and the other of the source and the drain of the fourth transistor is electrically connected to one of the source and the drain of the driving transistor; wherein the first power signal writing module includes a fifth transistor, a gate of the fifth transistor receives the second scan signal, one of a source and a drain of the fifth transistor receives the first power signal, and the other of the source and the drain of the fifth transistor is electrically connected to the gate of the driving transistor; wherein the second power signal writing module includes a sixth transistor, a gate of the sixth transistor receives the third scan signal, one of a source and a drain of the sixth transistor receives the second power signal, and the other of the source and the drain of the sixth transistor is electrically connected to the gate of the driving transistor; wherein the storage module includes a storage capacitor, one end of the storage capacitor is electrically connected to the gate of the driving transistor, and the other end of the storage capacitor receives the second power signal. ### Claim 7 (depends on 6) The driving circuit of the light-emitting device of claim 6, wherein the driving circuit of the light-emitting device controls a turn-on time node of the sixth transistor through the third scan signal, and slices an iso-molecular field to a non-isomolecular field for a pulse width of the light-emitting device. ### Claim 8 (depends on 1) The driving circuit of the light-emitting device of claim 1, wherein a driving control timing of the driving circuit of the light-emitting device includes a reset stage, a compensation stage, a light-emitting stage, and a black frame insertion stage; wherein in the reset stage, the first scan signal and the second scan signal are both at a high potential, and the fourth scan signal, the third scan signal, and the light-emitting control signal are all at a low potential; wherein in the compensation stage, the first scan signal and the fourth scan signal are both at a high potential, and the second scan signal, the third scan signal, and the light-emitting control signal are all at a low potential; wherein in the light-emitting stage, the light-emitting control signal is at a high potential, and the first scan signal, the second scan signal, the fourth scan signal, and the third scan signal are all at a low potential; wherein in the black frame insertion stage, the light-emitting control signal and the third scan signal are both at a high potential, and the first scan signal, the second scan signal, and the fourth scan signal are all at a low potential. ### Claim 9 (depends on 1) The driving circuit of the light-emitting device of claim 1, wherein a potential of the first power signal is greater than a potential of the second power signal. ### Claim 10 A backlight module, comprising: a data line, configured to provide a data signal; a first scan line, configured to provide a first scan signal; a second scan line, configured to provide a second scan signal; a third scan line, configured to provide a third scan signal; a light-emitting control signal line, configured to provide a light-emitting control signal; and a driving circuit of a light-emitting device, connected to the data line, the first scan line, the second scan line, the third scan line, and the light-emitting control signal line; wherein the driving circuit of the light-emitting device includes: a light-emitting device, connected in series to a light-emitting circuit formed by a first power signal and a second power signal; a driving transistor, wherein a source and a drain of the driving transistor are connected in series to the light-emitting circuit, and the driving transistor is configured to control a current flowing through the light-emitting circuit; a data signal writing module, receiving the first scan signal and the data signal, and electrically connected to one of the source and the drain of the driving transistor, wherein the data signal writing module is configured to write the data signal to one of the source and the drain of the driving transistor under control of the first scan signal; a first power signal writing module, receiving the second scan signal and the first power signal, and electrically connected to a gate of the driving transistor, wherein the first power signal writing module is configured to write the first power signal into the gate of the driving transistor under control of the second scan signal; a second power signal writing module, receiving the third scan signal and the second power signal, and electrically connected to the gate of the driving transistor, wherein the second power signal writing module is configured to write the second power signal into the gate of the driving transistor under control of the third scan signal; a light-emitting control module, receiving the light-emitting control signal and connected in series to the light-emitting circuit, wherein the light-emitting control module is configured to control the light-emitting circuit to be turned on or to be turned off based on the light-emitting control signal; and a storage module, electrically connected to the gate of the driving transistor and receiving the second power signal, wherein the storage module is configured to store a potential of the gate of the driving transistor. ### Claim 11 (depends on 10) The backlight module of claim 10, wherein the driving circuit of the light-emitting device further includes a compensation module, receiving a fourth scan signal, and electrically connected to the other of the source and the drain of the driving transistor and the gate of the driving transistor, wherein the compensation module is configured to compensate a threshold voltage of the driving transistor under control of the fourth scan signal. ### Claim 12 (depends on 11) The backlight module of claim 11, wherein the compensation module includes a first transistor, a gate of the first transistor receives the fourth scan signal, one of a source and a drain of the first transistor is electrically connected to the gate of the driving transistor, and the other of the source and the drain of the first transistor is electrically connected to one of the source and the drain of the driving transistor. ### Claim 13 (depends on 10) The backlight module of claim 10, wherein the light-emitting control module includes: a first light-emitting control unit, receiving the light-emitting control signal, and connected in series to the light-emitting circuit, wherein the first light-emitting control unit is configured to control the light-emitting circuit to be turned on or to be turned off under control of the light-emitting control signal; and/or a second light-emitting control unit, receiving the light-emitting control signal, and connected in series to the light-emitting circuit, wherein the second light-emitting control unit is configured to control the light-emitting circuit to be turned on or to be turned off under control of the light-emitting control signal. ### Claim 14 (depends on 13) The backlight module of claim 13, wherein the light-emitting control module includes the first light-emitting control unit and the second light-emitting control unit, the first light-emitting control unit includes a second transistor, and the second light-emitting control unit includes a third transistor; wherein a gate of the second transistor and a gate of the third transistor both receive the light-emitting control signal, one of a source and a drain of the second transistor is electrically connected to one end of the light-emitting device, and the other of the source and the drain of the second transistor is electrically connected to one of the source and the drain of the driving transistor; wherein one of a source and a drain of the third transistor receives the second power signal, and the other of the source and the drain of the third transistor is electrically connected to the other of the source and the drain of the driving transistor. ### Claim 15 (depends on 10) The backlight module of claim 10, wherein the data signal writing module includes a fourth transistor, a gate of the fourth transistor receives the first scan signal, one of a source and a drain of the fourth transistor receives the data signal, and the other of the source and the drain of the fourth transistor is electrically connected to one of the source and the drain of the driving transistor; wherein the first power signal writing module includes a fifth transistor, a gate of the fifth transistor receives the second scan signal, one of a source and a drain of the fifth transistor receives the first power signal, and the other of the source and the drain of the fifth transistor is electrically connected to the gate of the driving transistor; wherein the second power signal writing module includes a sixth transistor, a gate of the sixth transistor receives the third scan signal, one of a source and a drain of the sixth transistor receives the second power signal, and the other of the source and the drain of the sixth transistor is electrically connected to the gate of the driving transistor; wherein the storage module includes a storage capacitor, one end of the storage capacitor is electrically connected to the gate of the driving transistor, and the other end of the storage capacitor receives the second power signal. ### Claim 16 A display panel, comprising: a plurality of pixel units arranged in an array, wherein each of the pixel units includes a driving circuit of a light-emitting device, and the driving circuit of the light-emitting device includes: a light-emitting device, connected in series to a light-emitting circuit formed by a first power signal and a second power signal; a driving transistor, wherein a source and a drain of the driving transistor are connected in series to the light-emitting circuit, and the driving transistor is configured to control a current flowing through the light-emitting circuit; a data signal writing module, receiving a first scan signal and a data signal, and electrically connected to one of the source and the drain of the driving transistor, wherein the data signal writing module is configured to write the data signal to one of the source and the drain of the driving transistor under control of the first scan signal; a first power signal writing module, receiving a second scan signal and the first power signal, and electrically connected to a gate of the driving transistor, wherein the first power signal writing module is configured to write the first power signal into the gate of the driving transistor under control of the second scan signal; a second power signal writing module, receiving a third scan signal and the second power signal, and electrically connected to the gate of the driving transistor, wherein the second power signal writing module is configured to write the second power signal into the gate of the driving transistor under control of the third scan signal; a light-emitting control module, receiving a light-emitting control signal and connected in series to the light-emitting circuit, wherein the light-emitting control module is configured to control the light-emitting circuit to be turned on or to be turned off based on the light-emitting control signal; and a storage module, electrically connected to the gate of the driving transistor and receiving the second power signal, wherein the storage module is configured to store a potential of the gate of the driving transistor. ### Claim 17 (depends on 16) The display panel of claim 16, wherein the driving circuit of the light-emitting device further includes a compensation module, receiving a fourth scan signal, and electrically connected to the other of the source and the drain of the driving transistor and the gate of the driving transistor, wherein the compensation module is configured to compensate a threshold voltage of the driving transistor under control of the fourth scan signal. ### Claim 18 (depends on 16) The display panel of claim 16, wherein the light-emitting control module includes: a first light-emitting control unit, receiving the light-emitting control signal, and connected in series to the light-emitting circuit, wherein the first light-emitting control unit is configured to control the light-emitting circuit to be turned on or to be turned off under control of the light-emitting control signal; and/or a second light-emitting control unit, receiving the light-emitting control signal, and connected in series to the light-emitting circuit, wherein the second light-emitting control unit is configured to control the light-emitting circuit to be turned on or to be turned off under control of the light-emitting control signal. ### Claim 19 (depends on 16) The display panel of claim 16, wherein the light-emitting control module includes the first light-emitting control unit and the second light-emitting control unit, the first light-emitting control unit includes a second transistor, and the second light-emitting control unit includes a third transistor; wherein a gate of the second transistor and a gate of the third transistor both receive the light-emitting control signal, one of a source and a drain of the second transistor is electrically connected to one end of the light-emitting device, and the other of the source and the drain of the second transistor is electrically connected to one of the source and the drain of the driving transistor; wherein one of a source and a drain of the third transistor receives the second power signal, and the other of the source and the drain of the third transistor is electrically connected to the other of the source and the drain of the driving transistor. ### Claim 20 (depends on 16) The display panel of claim 16, wherein the data signal writing module includes a fourth transistor, a gate of the fourth transistor receives the first scan signal, one of a source and a drain of the fourth transistor receives the data signal, and the other of the source and the drain of the fourth transistor is electrically connected to one of the source and the drain of the driving transistor; wherein the first power signal writing module includes a fifth transistor, a gate of the fifth transistor receives the second scan signal, one of a source and a drain of the fifth transistor receives the first power signal, and the other of the source and the drain of the fifth transistor is electrically connected to the gate of the driving transistor; wherein the second power signal writing module includes a sixth transistor, a gate of the sixth transistor receives the third scan signal, one of a source and a drain of the sixth transistor receives the second power signal, and the other of the source and the drain of the sixth transistor is electrically connected to the gate of the driving transistor; wherein the storage module includes a storage capacitor, one end of the storage capacitor is electrically connected to the gate of the driving transistor, and the other end of the storage capacitor receives the second power signal.