# US 10,504,430 B2 · Display device with duty control function and duty control method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,504,430 B2 - Document ID: US10504430B2 - Status: Granted - Kind: B2 - Application number: 15/835,774 - Filed: 2017-12-08 - Published: 2018-06-21 - Granted: 2019-12-10 - Earliest claimed: 2016-12-21 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: Hyuckjun Kim; Bumsik Kim; Jaeyoon Bae; Seungtae Kim; Kyoungdon Woo - Web page: https://patentgrep.com/patent/US10504430B2 ## CPC - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - H10K 59/131: Interconnections, e.g. wiring lines or terminals - G09G 3/2081: {with combination of amplitude modulation and time modulation (space and time error diffusion G09G3/2066)} - G09G 2310/0205: Simultaneous scanning of several lines in flat panels - G09G 2310/0264: Details of driving circuits - G09G 2310/04: Partial updating of the display screen - G09G 2320/103: Detection of image changes, e.g. determination of an index representative of the image change - G09G 2360/16: Calculation or use of calculated indices related to luminance levels in display data - H10K 59/805: {Electrodes} - 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) - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract A display device includes a display panel on which a plurality of pixels connected to data lines, reference lines, and gate lines are arranged, each pixel having an organic light emitting diode (OLED) and a driving thin film transistor (TFT); a data drive circuit to supply a data voltage to the data lines and a reference voltage to the reference lines; a gate drive circuit to generate a scan signal and a sensing signal and to supply the scan signal and the sensing signal to the gate lines, the scan signal being synchronized with the data voltage and the sensing signal being synchronized with the reference voltage; and a timing controller to divide one frame into a programming time, an emission time, and a non-emission time, and to control an emission duty by variably controlling the programming time based on an analysis of input image data. ## Claims ### Claim 1 A display device comprising: a display panel on which a plurality of pixels connected to data lines, reference lines, and gate lines are arranged, wherein each of the pixels comprises an Organic Light Emitting Diode (OLED) and a driving Thin Film Transistor (TFT) for controlling a driving current flowing in the OLED in accordance with a gate-source voltage; a data drive circuit configured to supply a data voltage to the data lines and a reference voltage to the reference lines; a gate drive circuit configured to generate a scan signal and a sensing signal and supply the scan signal and the sensing signal to the gate lines, wherein the scan signal is to be synchronized with the data voltage and the sensing signal is to be synchronized with the reference voltage; and a timing controller configured to divide one frame into a programming time, an emission time, and a non-emission time to drive the display panel, and control an emission duty by variably controlling the programming time based on a result of analysis of input image data, wherein the programming time is a period of time in which the gate-source voltage is set for the driving current, the emission time is a period of time in which the OLED emits light in accordance with the driving current, and the non-emission time is a period of time in which the OLED stops emitting light, wherein, in a cinema view mode in which an empty area is displayed in upper and lower parts of the display panel, the timing controller sets the gate-source voltage for areas, except for the empty area, for the driving current, so that the programming time is reduced, wherein, when the emission time is reduced as a result of controlling of the emission duty, the timing controller corrects data Vdata, which is input to a driving TFT of a corresponding OLED, into a corrected data V′data based on the following equation: V data ′ = V data × ( Emission ⁢ ⁢ Time ⁢ ⁢ Ref . Emission ⁢ ⁢ Time ) 2 . [ Equation ] ### Claim 2 (depends on 1) The display device of claim 1, wherein, when the result of analysis of the input image data shows that image data of one or more lines is maintained as identical data, the timing controller controls the gate drive circuit so that a gate output corresponding to the one or more lines are turned on simultaneously. ### Claim 3 (depends on 1) The display device of claim 1, wherein the timing controller controls the gate drive circuit so that gate outputs corresponding to lines displaying the empty area are turned on at the same time. ### Claim 4 (depends on 1) The display device of claim 1, wherein, when the emission time is reduced as a result of controlling of the emission duty, the timing controller corrects a voltage of input data so that a gate-source voltage to be input to the driving TFT of a corresponding OLED is increased. ### Claim 5 (depends on 4) The display device of claim 4, wherein, when controlling the emission duty, the timing controller calculates a gray level of input image data, and, in response to the calculated gray level being equal to or less than a reference value, corrects a gate-source voltage to be input to the driving TFT of a corresponding OLED. ### Claim 6 A driving method of a display device which comprises a display panel on which a plurality of pixels connected to data lines, reference lines, and gate lines are arranged, wherein each of the pixels comprises an Organic Light Emitting Diode (OLED), a driving Thin Film Transistor (TFT) for controlling a driving current flowing in the OLED in accordance with a gate-source voltage, the method comprising: supplying a data voltage to the data lines and a reference voltage to the reference lines; generating a scan signal and a sensing signal and supplying the scan signal and the sensing signal to the gate lines, wherein the scan signal is to be synchronized with the data voltage and the sensing signal is to be synchronized with the reference voltage; dividing one frame into a programming time, an emission time, and a non-emission time to drive the display panel, and controlling an emission duty by variably controlling the programming time based on a result of analysis of input image data, wherein the programming time is a period of time in which the gate-source voltage is set for the driving current, the emission time is a period of time in which the OLED emits light in accordance with the driving current, and the non-emission time is a period of time in which the OLED stops emitting light; and in a cinema view mode in which an empty area is displayed in upper and lower parts of the display panel, setting the gate-source voltage for areas, except for the empty area, for the driving current, so that the programming time is reduced, wherein, when the emission time is reduced as a result of controlling of the emission duty, the timing controller corrects data Vdata, which is input to a driving TFT of a corresponding OLED, into a corrected data V′data based on the following equation: V data ′ = V data × ( Emission ⁢ ⁢ Time ⁢ ⁢ Ref . Emission ⁢ ⁢ Time ) 2 . [ Equation ] ### Claim 7 (depends on 6) The driving method of claim 6, wherein, when the result of analysis of the input image data shows that image data of one or more lines is maintained as identical data, the method comprises: controlling the gate drive circuit so that a gate output corresponding to the one or more lines are turned on simultaneously; and setting the gate-source voltage for lines, except for lines in which the gate output is turned on, so that the gate-source voltage is set for the driving current. ### Claim 8 (depends on 6) The driving method of claim 6, further comprising, when the emission time is reduced as a result of controlling the emission duty, correcting a voltage of an input data so that a gate-source voltage to be input to the driving TFT of a corresponding OLED is increased. ### Claim 9 A display device comprising: a display panel on which a plurality of pixels connected to data lines, reference lines, and gate lines are arranged, wherein each of the pixels comprises an Organic Light Emitting Diode (OLED) and a driving Thin Film Transistor (TFT) for controlling a driving current flowing in the OLED in accordance with a gate-source voltage; a data drive circuit configured to supply a data voltage to the data lines and a reference voltage to the reference lines; a gate drive circuit configured to generate a scan signal and a sensing signal and supply the scan signal and the sensing signal to the gate lines, wherein the scan signal is to be synchronized with the data voltage and the sensing signal is to be synchronized with the reference voltage; and a timing controller configured to divide one frame into a programming time, an emission time, and a non-emission time to drive the display panel, and control an emission duty by variably controlling the programming time based on a result of analysis of input image data, wherein the programming time is a period of time in which the gate-source voltage is set for the driving current, the emission time is a period of time in which the OLED emits light in accordance with the driving current, and the non-emission time is a period of time in which the OLED stops emitting light, wherein, when the emission time is reduced as a result of controlling of the emission duty, the timing controller corrects data Vdata, which is input to a driving TFT of a corresponding OLED, into a corrected data V′data based on the following equation: V data ′ = V data × ( Emission ⁢ ⁢ Time ⁢ ⁢ Ref . Emission ⁢ ⁢ Time ) 2 . [ Equation ] ### Claim 10 (depends on 9) The display device of claim 9, wherein, when the result of analysis of the input image data shows that image data of one or more lines is maintained as identical data, the timing controller controls the gate drive circuit so that a gate output corresponding to the one or more lines are turned on simultaneously. ### Claim 11 (depends on 9) The display device of claim 9, wherein, in a cinema view mode in which an empty area is displayed in upper and lower parts of the display panel, the timing controller sets the gate-source voltage for areas, except for the empty area, for the driving current, so that the programming time is reduced. ### Claim 12 (depends on 11) The display device of claim 11, wherein the timing controller controls the gate drive circuit so that gate outputs corresponding to lines displaying the empty area are turned on at the same time. ### Claim 13 (depends on 9) The display device of claim 9, wherein, when the emission time is reduced as a result of controlling of the emission duty, the timing controller corrects a voltage of input data so that a gate-source voltage to be input to a driving TFT of a corresponding OLED is increased. ### Claim 14 (depends on 13) The display device of claim 13, wherein, when controlling the emission duty, the timing controller calculates a gray level of input image data, and, in response to the calculated gray level being equal to or less than a reference value, corrects a gate-source voltage to be input to a driving TFT of a corresponding OLED.