# US 10,319,295 B2 · Driving apparatus, driving method and display apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,319,295 B2 - Document ID: US10319295B2 - Status: Granted - Kind: B2 - Application number: 15/502,274 - Filed: 2016-07-04 - Published: 2018-03-08 - Granted: 2019-06-11 - Earliest claimed: 2015-12-31 - Assignees: Boe Technology Group Co., Ltd. - Applicants: BOE Technology Group Co., Ltd. - Inventors: Xinshe Yin - Web page: https://patentgrep.com/patent/US10319295B2 ## CPC - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 3/2007: {Display of intermediate tones} - G09G 3/2018: {by time modulation using two or more time intervals} - 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 - 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 2300/0866: by means of changes in the pixel supply voltage - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes - G09G 2320/045: Compensation of drifts in the characteristics of light emitting or modulating elements - G09G 2320/064: by time modulation of the brightness of the illumination source - G09G 2330/021: Power management, e.g. power saving - G09G 2330/028: Generation of voltages supplied to electrode drivers in a matrix display other than LCD - 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 The present disclosure provides a driving apparatus for driving a light-emitting element. By dividing a light emission phase of the light-emitting element into at least two sub-phases, i.e., adding a dual-level level control signal, wherein one level causes the light-emitting element to emit light normally and the other level causes the light-emitting element to be turned off or operate under an extremely small current. By adjusting a duty ratio of the dual-level level control signal, a driving current of the light-emitting element during light emission can be adjusted to realize accurate control of the driving current of the light-emitting element. The present disclosure further provides a driving method for the driving apparatus and a display apparatus including the driving apparatus. ## Claims ### Claim 1 A driving apparatus for driving a light-emitting element, comprising: a source driving circuit configured to generate a row scanning signal required for driving the light-emitting element and a data signal, wherein the data signal is written into a driving control circuit for the light-emitting element when the row scanning signal is valid; the driving control circuit configured to write a parameter of a driving element for the light-emitting element while writing the data signal when the row scanning signal is valid, wherein the driving control circuit is further configured to receive a level control signal and provide a driving voltage to the driving element according to the data signal, the parameter of the driving element and the level control signal in a light emission phase of the light-emitting element; and the driving element configured to convert the driving voltage provided by the driving control circuit into a driving current, and provide the driving current to the light-emitting element, so that the light-emitting element emits light under the driving of the driving current provided by the driving element; wherein the level control signal is configured to comprise a high level and a low level, one of which causes the driving voltage not to be sufficient enough to drive the driving element, and the other of which causes the driving control circuit to provide the driving voltage to the driving element according to the data signal and the parameter of the driving element to cause the light-emitting element to emit light, wherein the driving apparatus further comprises a voltage selector configured to receive a selection signal, select a power supply signal at one of a high level and a low level according to the selection signal, and output the power supply signal selected to the driving control circuit as the level control signal, and wherein a duty ratio between the high level and the low level of the level control signal is adjustable. ### Claim 2 (depends on 1) The driving apparatus according to claim 1, wherein the level control signal is a power supply signal of the light-emitting element, wherein when the level control signal is at a high level, the driving control circuit provides the driving voltage to the driving element according to the data signal and the parameter of the driving element to drive the light-emitting element to emit light by the driving element, and when the level control signal is at a low level, the provided driving voltage is unable to drive the driving element and thereby the light-emitting element does not emit light. ### Claim 3 (depends on 2) The driving apparatus according to claim 2, wherein the voltage selector comprises a high level voltage power supply for outputting the high level power supply signal and a low level voltage power supply for outputting the low level power supply signal. ### Claim 4 (depends on 3) The driving apparatus according to claim 3, wherein one of the high level power supply signal and the low level power supply signal is set as a power supply signal for causing the light-emitting element to emit light normally, and when the other of the high level power supply signal and the low level power supply signal is set as a power supply signal and the power supply signal is applied, driving elements are all in a cut-off state under all the data signals. ### Claim 5 (depends on 3) The driving apparatus according to claim 3, wherein the selection signal is generated by the source driving circuit or an external circuit. ### Claim 6 (depends on 3) The driving apparatus according to claim 3, wherein the voltage selector is comprised in the source driving circuit. ### Claim 7 (depends on 1) The driving apparatus according to claim 1, wherein the level control signal is input to a control terminal of the driving element, wherein the level control signal at one of the high level and the low level causes the driving element to be driven normally, and the level control signal at the other of the high level and the low level causes the driving element to be in a cut-off state or in a slight turn-on state. ### Claim 8 (depends on 7) The driving apparatus according to claim 7, wherein the level control signal is generated by the source driving circuit or an external circuit. ### Claim 9 (depends on 1) The driving apparatus according to claim 1, wherein the level control signal is synchronous with the row scanning signal. ### Claim 10 (depends on 3) The driving apparatus according to claim 3, wherein the voltage selector comprises a first transistor having a gate configured to receive the selection signal of the driving voltage control circuit, a source configured to receive a high level power supply signal, and a drain connected to a gate of a second transistor; the second transistor having a source configured to receive the high level power supply signal, and a drain connected to an output terminal; a first resistor having one end connected to the gate of the second transistor and the other end connected to the ground; a third transistor having a gate connected to a source of a fourth transistor, a source configured to receive a low level power supply signal, and a drain connected to the output end; the fourth transistor having a gate configured to receive the selection signal of the driving voltage control circuit and a drain connected to the ground; and a second resistor having one end connected to the source of the third transistor and the other end connected to the gate of the third transistor. ### Claim 11 (depends on 1) A method for driving a light-emitting element applied in the driving apparatus according to claim 1, comprising: providing a row scanning signal on a row scanning line; providing a data signal on a data line; providing a level control signal; writing a parameter of a driving element of the light-emitting element into a driving control circuit while writing the data signal when the row scanning signal is valid; and providing a driving voltage to the driving element according to the data signal, the parameter of the driving element and the level control signal in a light emission phase of the light-emitting element; wherein the level control signal is generated to comprise a high level power supply signal or a low level power supply signal according to a selection signal, one of the high level power supply signal and the low level power supply signal causes the driving voltage not to be sufficient enough to drive the driving element, and the other causes the driving voltage to be provided to the driving element according to the data signal and the parameter of the driving element to cause the light-emitting element to emit light. ### Claim 12 (depends on 11) The method according to claim 11, wherein the level control signal is a power supply signal of the light-emitting element. ### Claim 13 (depends on 11) The method according to claim 11, wherein the level control signal is applied to a control terminal of the driving element, wherein the level control signal at one of the high level and the low level causes the driving element to be driven normally, and the level control signal at the other of the high level and the low level causes the driving element to be in a cut-off state or in a slight turn-on state. ### Claim 14 (depends on 11) The method according to claim 11, wherein the level control signal is synchronous with the row scanning signal. ### Claim 15 (depends on 1) A display apparatus, comprising: the driving apparatus according to claim 1; and light-emitting elements each configured to emit light according to the driving current provided by the driving apparatus. ### Claim 16 (depends on 2) The driving apparatus according to claim 2, wherein the level control signal is synchronous with the row scanning signal. ### Claim 17 (depends on 3) The driving apparatus according to claim 3, wherein the level control signal is synchronous with the row scanning signal. ### Claim 18 (depends on 12) The method according to claim 12, wherein the level control signal is synchronous with the row scanning signal. ### Claim 19 (depends on 13) The method according to claim 13, wherein the level control signal is synchronous with the row scanning signal.