# US 12,118,958 B2 · Display device and method for driving the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,118,958 B2 - Document ID: US12118958B2 - Status: Granted - Kind: B2 - Application number: 17/963,978 - Filed: 2022-10-11 - Published: 2023-04-20 - Granted: 2024-10-15 - Earliest claimed: 2021-10-18 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: Zonggun Oh; Jaehun Jung - Web page: https://patentgrep.com/patent/US12118958B2 ## CPC - G09G 3/3275: Details of drivers for data electrodes - G09G 5/10: Intensity circuits - G09G 2310/0291: Details of output amplifiers or buffers arranged for use in a driving circuit - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/0276: for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction - G09G 2320/0653: Controlling or limiting the speed of brightness adjustment of the illumination source - 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 The present disclosure relates to a display device and a method for driving the same. The display device includes: a timing controller which receives a dimming value from the outside, determines a dimming band corresponding to the dimming value, and generates and outputs an image data and a data driving control signal; a data driver which outputs, on the basis of the data driving control signal, a data signal corresponding to the image data; and a display panel which displays an image corresponding to the data signal. ## Claims ### Claim 1 A display device comprising: a display panel which, in operation, displays an image corresponding to a data signal; a timing controller which, in operation: receives a dimming value from outside the display device; determines a dimming band corresponding to the dimming value; generates image data and a data driving control signal, the data driving control signal including a power management signal and a dimming band signal, the dimming band signal corresponding to the dimming band; and a data driver which, in operation, receives the image data and the data driving control signal, the data driver including: a power management circuit configured to output a bias current corresponding to power consumption set by the power management signal on the basis of the dimming band signal directly received from the timing controller; and an output buffer configured to output the data signal corresponding to the image data by using the bias current, wherein the power management circuit is configured to vary the power consumption of the data driver by varying the bias current provided to the output buffer according to the dimming band directly received from the timing controller. ### Claim 2 (depends on 1) The display device of claim 1, wherein, in response to the dimming band signal, the power management circuit controls the power consumption to the power consumption set by the power management signal, or limits the power consumption to power consumption set by the dimming band signal. ### Claim 3 (depends on 2) The display device of claim 2, wherein, when the power consumption set by the power management signal is greater than the power consumption corresponding to the dimming band signal, the power management circuit limits the power consumption to the power consumption corresponding to the dimming band signal, in response to the dimming band signal. ### Claim 4 (depends on 1) The display device of claim 1, wherein the power management signal selects power consumption corresponding to first to i-th values respectively, i being an integer greater than 1, and wherein the power management circuit sets the power consumption corresponding to the power management signal to a default value of the power consumption. ### Claim 5 (depends on 4) The display device of claim 4, wherein the dimming band signal selects whether to limit the power consumption corresponding to the first to i-th values respectively. ### Claim 6 (depends on 5) The display device of claim 5, wherein the power management circuit sets the power consumption to the default value when the dimming band signal has a first value. ### Claim 7 (depends on 6) The display device of claim 6, wherein, when the dimming band signal has a j-th value, j being an integer in a range from 2 to i, and the power consumption set by the power management signal is greater than power consumption corresponding to the j-th value, the power management circuit limits the power consumption to the power consumption corresponding to the j-th value. ### Claim 8 (depends on 1) The display device of claim 1, wherein the data driving control signal further comprises a variable control signal for variably controlling the power consumption, and wherein, in response to the variable control signal, the power management circuit fixes the power consumption to the power consumption set by the power management signal or changes the power consumption set by the power management signal in accordance with the dimming band signal. ### Claim 9 (depends on 1) The display device of claim 1, wherein the power management circuit controls a magnitude of a bias current applied to an output buffer of the data driver, in response to the power consumption. ### Claim 10 A method for driving a display device, the method comprising: determining, by a timing controller, a dimming band corresponding to a dimming value input from outside the display device; generating, by the timing controller, image data and a data driving control signal, the data driving control signal including a power management signal and a dimming band signal corresponding to the dimming value; outputting, by the timing controller, the image data and the data driving control signal to a data driver; outputting, by the data driver, a data signal corresponding to the image data, on the basis of the data driving control signal, the data driver having power consumption set by the power management signal and limited on the basis of the dimming band signal received from the timing controller; and displaying, by a display panel, an image corresponding to the data signal, wherein the outputting the data signal by the data driver includes: setting, by a power management circuit, the power consumption set by the power management signal to a default value; controlling the power consumption to the default value, in response to the dimming band signal; outputting a bias current to an output buffer in response to the controlled power consumption; and outputting, by the output buffer, the data signal corresponding to the image data by using the bias current. ### Claim 11 (depends on 10) The method of claim 10, wherein the outputting the data signal by the data driver comprises: setting, by a power management circuit, the power consumption set by the power management signal to a default value; limiting, by the power management circuit, the power consumption to power consumption set by the dimming band signal, in response to the dimming band signal; outputting a bias current to an output buffer in response to the limited power consumption; and outputting, by the output buffer, the data signal corresponding to the image data by using the bias current. ### Claim 12 (depends on 10) The method of claim 10, wherein the power management signal selects power consumption corresponding to first to i-th values, respectively, i being an integer greater than 1, and wherein the outputting the data signal by the data driver includes setting the power consumption corresponding to the power management signal to a default value of the power consumption. ### Claim 13 (depends on 12) The method of claim 12, wherein the dimming band signal selects whether to limit the power consumption corresponding to the first to i-th values respectively. ### Claim 14 (depends on 13) The method of claim 13, further comprising, after the setting the power consumption corresponding to the power management signal to the default value of the power consumption, setting the power consumption to the default value when the dimming band signal has a first value. ### Claim 15 (depends on 14) The method of claim 14, further comprising, after the setting the power consumption corresponding to the power management signal to the default value of the power consumption, when the dimming band signal has a j-th value, j being an integer in a range from 2 to i, and the power consumption set by the power management signal is greater than power consumption corresponding to the j-th value, limiting the power consumption to the power consumption corresponding to the j-th value. ### Claim 16 (depends on 10) The method of claim 10, wherein the data driving control signal further includes a variable control signal for variably controlling the power consumption, and wherein the outputting the data signal by the data driver includes, in response to the variable control signal, fixing the power consumption to the power consumption set by the power management signal or changing the power consumption set by the power management signal in accordance with the dimming band signal. ### Claim 17 (depends on 16) The method of claim 16, wherein the changing the power consumption set by the power management signal in accordance with the dimming band signal includes controlling a magnitude of a bias current applied to an output buffer of the data driver, in response to the power consumption. ### Claim 18 A display device comprising: a display panel which, in operation, displays an image corresponding to a data signal; a timing controller which, in operation: generates image data and a data driving control signal, the data driving control signal including a power management signal and a dimming band signal; and outputs the image data and the data driving control signal to a data driver; and the data driver including a power management circuit having a first power management circuit and a second power management circuit, wherein the data driver, in operation: selects a power management mode associated with a first bias current, including: applying a first voltage to the first power management circuit based on a first bit of the data driving control signal; and applying a second voltage to the second power management circuit based on a second bit of the data driving control signal; and controls the power management circuit to output a second bias current having a level lower than that of the first bias current based on the dimming band signal. ### Claim 19 (depends on 18) The display device of claim 18, wherein the data driving control signal includes a variable control signal, and the data driver is operable to, in response to the variable control signal indicating a manual control mode, control the power management circuit to output the first bias current that exceeds the second bias current.