# US 12,008,951 B2 ยท Display device and electronic device > Agents: this data is available as JSON from the patentgrep API and MCP server โ€” see https://patentgrep.com/llms.txt - Number: US 12,008,951 B2 - Document ID: US12008951B2 - Status: Granted - Kind: B2 - Application number: 18/222,976 - Filed: 2023-07-17 - Published: 2024-04-25 - Granted: 2024-06-11 - Earliest claimed: 2022-10-24 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Kyung-Hun Lee - Web page: https://patentgrep.com/patent/US12008951B2 ## 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 3/20: for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} - G09G 2310/0275: Details of drivers for data electrodes, other than drivers for liquid crystal, plasma or OLED displays, not related to handling digital grey scale data or to communication of data to the pixels by means of a current - G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes - 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 Disclosed is a display device which includes a display panel, a voltage generator, and a driving controller. The voltage generator generates a driving voltage and determines a voltage level of the driving voltage based on a voltage control signal. A current compensator calculates a load based on previous image data and outputs compensation image data with target luminance by compensating for current image data based on the load. The driving controller turns on the current compensator in a normal mode such that an image is displayed with the target luminance, and turns off the current compensator in a setting mode such that an image corresponding to the current image data is displayed with given reference luminance. ## Claims ### Claim 1 A display device comprising: a display panel including a pixel configured to receive a driving voltage; a voltage generator configured to generate the driving voltage and to determine a voltage level of the driving voltage based on a voltage control signal; and a driving controller configured to control driving of the display panel, wherein the driving controller includes: a current compensator configured to calculate a load based on a previous image data and to output compensation image data having a target luminance by compensating for a current image data based on the load, and wherein the driving controller is configured to: turn on the current compensator in a normal mode such that an image is displayed with the target luminance, and turn off the current compensator in a setting mode such that an image corresponding to the current image data is displayed with a given reference luminance. ### Claim 2 (depends on 1) The display device of claim 1, wherein the current compensator is turned on in response to a first enable signal activated in the normal mode and is turned off in response to a second enable signal activated in the setting mode. ### Claim 3 (depends on 2) The display device of claim 2, wherein the driving controller further includes: a reference compensator, wherein the reference compensator is turned on in response to the second enable signal in the setting mode and outputs a reference image data having the given reference luminance by compensating for the current image data. ### Claim 4 (depends on 3) The display device of claim 3, further comprising: a data driver configured to: in the normal mode, receive the compensation image data and output a compensation data voltage which is converted from the compensation image data to the display panel, and in the setting mode, receive the reference image data and output a reference data voltage which is converted from the reference image data to the display panel. ### Claim 5 (depends on 2) The display device of claim 2, further comprising: a data driver, wherein the data driver includes a reference voltage generator, wherein in the normal mode, the reference voltage generator is turned on in response to the first enable signal and outputs a gamma reference voltage, and wherein, in the setting mode, the reference voltage generator compensates for the gamma reference voltage so as to be output as a compensation reference voltage. ### Claim 6 (depends on 5) The display device of claim 5, wherein the data driver further includes: a gamma voltage generator configured to: in the normal mode, receive the gamma reference voltage to generate gamma voltages, and in the setting mode, receive the compensation reference voltage to generate compensation gamma voltages; and a data converter configured to: in the normal mode, convert the compensation image data into a compensation data voltage based on the gamma voltages, and in the setting mode, convert the current image data into a reference data voltage based on the compensation gamma voltages. ### Claim 7 (depends on 2) The display device of claim 2, wherein the normal mode is a mode which does not coincide with at least one case of given cases, and wherein the setting mode is a mode which coincides with the at least one case of the given cases. ### Claim 8 (depends on 7) The display device of claim 7, wherein the at least one case includes a case in which a transition to a normal operation period is made after a given reference image is displayed during a given standby period, and wherein the display device operates in the setting mode during a first period of the normal operation period and operates in the normal mode during a second period of the normal operation period, which is different from the first period. ### Claim 9 (depends on 8) The display device of claim 8, wherein the first period includes a first frame of the normal operation period, and wherein the second period includes remaining frames other than the first frame. ### Claim 10 (depends on 8) The display device of claim 8, wherein the standby period is a period in which the reference image is displayed from at least one of a power-on time point, a time point when a display setting condition is changed, and a time point when it is determined that an abnormal signal is received, to a time point when the normal operation period is initiated. ### Claim 11 (depends on 1) The display device of claim 1, further comprising: a voltage controller configured to sense a driving current of the display panel, to compare the driving current and a given reference current, and to output the voltage control signal as a result of a comparison of the driving current and the given reference current. ### Claim 12 (depends on 11) The display device of claim 11, wherein the voltage controller includes: a determination block configured to receive the driving voltage as a feedback, to compare the driving voltage and a given reference driving voltage, and to determine whether the driving voltage decreases, based on a result of a comparison of the driving voltage and the given reference driving voltage; and a signal generation block, wherein, when it is determined that the driving voltage does not decrease, the signal generation block compares the driving current and the given reference current to output the voltage control signal, wherein, when it is determined that the driving voltage decreases, the signal generation block provides a holding control signal to the voltage generator, and wherein, in response to the holding control signal, the voltage generator maintains the driving voltage without modification. ### Claim 13 (depends on 12) The display device of claim 12, wherein the voltage generator is configured to: decrease the voltage level of the driving voltage in response to the voltage control signal during a previous frame, maintain the voltage level of the driving voltage in response to the holding control signal activated during a current frame, and adjust the voltage level of the driving voltage in response to the voltage control signal during a next frame. ### Claim 14 A display device comprising: a display panel including a pixel configured to receive a driving voltage; a voltage generator configured to generate the driving voltage, to change a voltage level of the driving voltage as much as a given first variation or more, based on a voltage control signal, and to change the voltage level of the driving voltage as much as a second variation or less, based on a holding control signal, the second variation being smaller than the first variation; and a power consumption controller configured to determine whether a previous image based on a previous image data coincides with a given grayscale pattern condition and to generate the voltage control signal or the holding control signal depending on a result of a determination whether the previous image based on the previous image data coincides with the given grayscale pattern condition. ### Claim 15 (depends on 14) The display device of claim 14, wherein the grayscale pattern condition is a condition in which the previous image includes one grayscale area or two grayscale areas, and wherein the two grayscale areas are different in grayscale. ### Claim 16 (depends on 14) The display device of claim 14, wherein, when the second variation is โ€œ0โ€, the voltage generator maintains the voltage level of the driving voltage without modification. ### Claim 17 (depends on 14) The display device of claim 14, wherein the power consumption controller is configured to: generate the voltage control signal based on a maximum image data having a maximum luminance from among the previous image data in a normal mode, and generate the voltage control signal or the holding a control signal depending on the determination in a response speed enhancement mode. ### Claim 18 (depends on 14) The display device of claim 14, wherein the voltage generator includes: a first adjustment block configured to maintain the voltage level of the driving voltage or to change the voltage level of the driving voltage as much as the first variation or more, based on the voltage control signal; and a second adjustment block configured to change the voltage level of the driving voltage as much as the second variation or less, based on the holding control signal. ### Claim 19 (depends on 18) The display device of claim 18, wherein the voltage generator is configured to: output the driving voltage having a first voltage level during a previous frame, output the driving voltage maintained at the first voltage level during a current frame, and output the driving voltage having a third voltage level changed from the first voltage level as much as the second variation during a next frame. ### Claim 20 An electronic device comprising: a display module including a display panel configured to receive a driving voltage and a voltage generator configured to generate the driving voltage and to determine a voltage level of the driving voltage based on a voltage control signal; a driving controller configured to receive an image signal and to convert the image signal into an image data; and a main processor configured to provide the image signal to the driving controller, wherein the driving controller includes: a current compensator configured to calculate a load based on a previous image data and to an output compensation image data having a target luminance by compensating for a current image data based on the load, and wherein the driving controller is configured to: turn on the current compensator in a normal mode such that an image is displayed with the target luminance, and turn off the current compensator in a setting mode such that an image corresponding to the current image data is displayed with a given reference luminance. ### Claim 21 An electronic device comprising: a display panel configured to receive a driving voltage; a voltage generator configured to generate the driving voltage, to change a voltage level of the driving voltage as much as a given first variation or more based on a voltage control signal, and to change the voltage level of the driving voltage as much as a second variation or less based on a holding control signal, the second variation being smaller than the first variation; and a driving controller configured to receive an image signal and to convert the image signal into an image data; a main processor configured to provide the image signal to the driving controller; and a power consumption controller configured to determine whether a previous image based on a previous image data coincides with a given grayscale pattern condition and to generate the voltage control signal or the holding control signal depending on a result of a determination whether the previous image based on the previous image data coincides with the given grayscale pattern condition.