# US 11,443,688 B2 · Image display apparatus and method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,443,688 B2 - Document ID: US11443688B2 - Status: Granted - Kind: B2 - Application number: 17/354,970 - Filed: 2021-06-22 - Published: 2022-01-27 - Granted: 2022-09-13 - Earliest claimed: 2020-06-22 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Seungnam Bae - Web page: https://patentgrep.com/patent/US11443688B2 ## CPC - G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED] - G09G 3/3225: using an active matrix - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/0257: Reduction of after-image effects - G09G 2320/041: Temperature compensation - G09G 2320/046: Dealing with screen burn-in prevention or compensation of the effects thereof - G09G 2330/027: Arrangements or methods related to powering off a display - 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 an image display apparatus and a method thereof. The image display apparatus according to an embodiment of the present disclosure comprises: a display panel; a panel temperature sensor configured to detect a temperature of the display panel; and a controller configured to: first check a state of the display panel; perform a primary afterimage compensation on the display panel based on a result of first checking the state of the display panel; monitor the temperature of the display panel through the panel temperature sensor when the primary afterimage compensation is performed; secondly check the state of the display panel when the temperature of the display panel is less than or equal to a predetermined reference temperature; and perform a secondary afterimage compensation on the display panel based on a result of secondly checking the state of the display panel. ## Claims ### Claim 1 An image display apparatus comprising: a display panel; a panel temperature sensor configured to detect a temperature of the display panel; and a controller configured to: calculate a threshold voltage for at least one pixel included in the display panel; perform a primary afterimage compensation on the display panel based on the calculated threshold voltage; monitor the temperature of the display panel through the panel temperature sensor when the primary afterimage compensation is performed; calculate mobility for the at least one pixel based on the monitored temperature of the display panel being less than or equal to a reference temperature; and perform a secondary afterimage compensation on the display panel based on the calculated mobility. ### Claim 2 (depends on 1) The image display apparatus according to claim 1, wherein the controller is further configured to determine an offset value corresponding to a change in the threshold voltage to perform the primary afterimage compensation. ### Claim 3 (depends on 1) The image display apparatus according to claim 1, wherein the controller is further configured to determine a gain value corresponding to the calculated mobility to perform the secondary afterimage compensation. ### Claim 4 (depends on 1) The image display apparatus according to claim 1, wherein the controller is further configured to calculate the threshold voltage based on a control signal for turning off a power of the image display apparatus being received. ### Claim 5 (depends on 1) The image display apparatus according to claim 1, further comprising a second temperature sensor configured to detect an ambient temperature around the image display apparatus, wherein the controller is further configured to: check the ambient temperature through the second temperature sensor when the primary afterimage compensation is performed; and determine a period of monitoring the temperature of the display panel based on the checked ambient temperature. ### Claim 6 (depends on 5) The image display apparatus according to claim 5, wherein the controller is further configured to: determine the period as a first period based on the checked ambient temperature being equal to a first temperature; and determine the period as a second period shorter than the first period based on the checked ambient temperature being lower than the first temperature. ### Claim 7 A method of operating an image display apparatus, the method comprising: calculating a threshold voltage for at least one pixel included in a display panel of the image display apparatus; performing a primary afterimage compensation on the display panel based on the calculated threshold voltage; monitoring a temperature of the display panel through a panel temperature sensor included in the image display apparatus when the primary afterimage compensation is performed; calculating mobility for the at least one pixel based on the monitored temperature of the display panel being less than or equal to a reference temperature; and performing a secondary afterimage compensation on the display panel based on the calculated mobility. ### Claim 8 (depends on 7) The method according to claim 7, wherein monitoring the temperature of the display panel comprises: checking an ambient temperature around the image display apparatus through a second temperature sensor included in the image display apparatus when the primary afterimage compensation is performed; and determining a period of monitoring the temperature of the display panel based on the checked ambient temperature.