# US 12,225,645 B2 · Display apparatus and method of controlling the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,225,645 B2 - Document ID: US12225645B2 - Status: Granted - Kind: B2 - Application number: 18/126,163 - Filed: 2023-03-24 - Published: 2023-11-30 - Granted: 2025-02-11 - Earliest claimed: 2022-05-24 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Hyungsuk Kim; Sungyeol Kim; Taeyeon Kim; Kyehoon Lee; Hyukjun Jang - Web page: https://patentgrep.com/patent/US12225645B2 ## CPC - H05B 45/56: involving measures to prevent abnormal temperature of the LEDs - G02F 1/133601: {for spatial active dimming} - G02F 1/133603: {with LEDs} - G02F 1/133612: {Electrical details} - G09G 3/34: by control of light from an independent source - G09G 3/3426: {the different display panel areas being distributed in two dimensions, e.g. matrix} - G09G 5/10: Intensity circuits - H05B 45/28: using temperature feedback - G09G 2320/0233: Improving the luminance or brightness uniformity across the screen - G09G 2320/041: Temperature compensation - G09G 2330/045: Protection against panel overheating - G09G 2360/16: Calculation or use of calculated indices related to luminance levels in display data - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS - 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 A display apparatus is provided. The display apparatus includes: a backlight unit including a substrate and light sources configured to emit light to a liquid crystal panel; and a processor configured to: identify a plurality of dimming blocks, each of which includes at least one light source among the plurality of light sources; predict a temperature for each of the plurality of dimming blocks based on a dimming signal corresponding to an input image and current-specific temperature profile information corresponding to the plurality of dimming blocks; update the dimming signal based on the temperature predicted for each of the plurality of dimming blocks; and control a supply current for each of the plurality of dimming blocks based on the dimming signal. ## Claims ### Claim 1 A display apparatus comprising: a liquid crystal panel; a backlight unit comprising a plurality of light sources provided on an upper surface of a substrate and configured to emit light to the liquid crystal panel; and at least one processor configured to: identify a plurality of dimming blocks, each of which comprises at least one light source among the plurality of light sources; generate a dimming signal according to luminance values obtained from an input image; predict a temperature for each of the plurality of dimming blocks based on the dimming signal and current-specific temperature profile information corresponding to the plurality of dimming blocks; update the dimming signal based on the temperature predicted for each of the plurality of dimming blocks; and control a supply current for each of the plurality of dimming blocks based on the dimming signal. ### Claim 2 (depends on 1) The display apparatus of claim 1, wherein the plurality of dimming blocks comprises a first dimming block and a second dimming block, wherein the dimming signal comprises a first dimming signal corresponding to the first dimming block and a second dimming signal corresponding to the second dimming block, and wherein the at least one processor is further configured to: update the first dimming signal to reduce a first supply current of the first dimming block based on a first predicted temperature for the first dimming block being higher than or equal to a preset value; and update the second dimming signal to increase a second supply current of the second dimming block based on a second predicted temperature for the second dimming block being lower than the preset value. ### Claim 3 (depends on 2) The display apparatus of claim 2, wherein the at least one processor is further configured to identify a weight of each of the plurality of dimming blocks based on the temperature predicted for each of the plurality of dimming blocks. ### Claim 4 (depends on 3) The display apparatus of claim 3, wherein the at least one processor is further configured to: identify an average cumulative current for each of the plurality of dimming blocks; and update the dimming signal to control the supply current for each of the plurality of dimming blocks based on a comparison of a preset reference current and the average cumulative current adjusted by the weight. ### Claim 5 (depends on 4) The display apparatus of claim 4, wherein the at least one processor is further configured to, based on the average cumulative current adjusted by the weight for a third dimming block, among the plurality of dimming blocks, being greater than or equal to the preset reference current, update the dimming signal to decrease a current supplied to the third dimming block. ### Claim 6 (depends on 4) The display apparatus of claim 4, wherein the at least one processor is further configured to, based on the average cumulative current adjusted by the weight for a third dimming block, among the plurality of dimming blocks, being less than the preset reference current, update the dimming signal to increase a current supplied to the third dimming block. ### Claim 7 (depends on 4) The display apparatus of claim 4, wherein the at least one processor is further configured to: identify the weight of the first dimming block to increase the average cumulative current for the first dimming block; and identify the weight of the second dimming block to decrease the average cumulative current for the second dimming block. ### Claim 8 (depends on 2) The display apparatus of claim 2, wherein the at least one processor is further configured to: divide the plurality of dimming blocks into a plurality of groups; and identify a weight that is shared by the plurality of dimming blocks provided in a first group of the plurality of groups based on a predicted temperature of a center dimming block in the first group. ### Claim 9 (depends on 8) The display apparatus of claim 8, wherein the at least one processor is further configured to identify an average cumulative current of the center dimming block in the first group, and based on the weight and the average cumulative current of the center dimming block, update the dimming signal to control each of the plurality of dimming blocks provided in the first group. ### Claim 10 (depends on 1) The display apparatus of claim 1, wherein the at least one processor is further configured to obtain the current-specific temperature profile information by measuring a temperature change in a dimming block at a plurality of different current values over time during a first period from a first point in time at which supply of a current to the dimming block is started to a second point in time at which the supply of the current to the dimming block is interrupted, and a second period from the second point in time to a third point in time. ### Claim 11 A display apparatus comprising: a liquid crystal panel; a backlight unit comprising a plurality of light sources provided on an upper surface of a substrate and configured to emit light to the liquid crystal panel; and at least one processor configured to: identify a plurality of dimming blocks, each of which comprises at least one light source among the plurality of light sources; predict a temperature for each of the plurality of dimming blocks based on a dimming signal corresponding to an input image and current-specific temperature profile information corresponding to the plurality of dimming blocks; update the dimming signal based on the temperature predicted for each of the plurality of dimming blocks; and control a supply current for each of the plurality of dimming blocks based on the dimming signal, wherein the at least one processor is further configured to predict the temperature of each of the plurality of dimming blocks based on an output of a neural network that uses the dimming signal corresponding to the input image and the current-specific temperature profile information of the plurality of dimming blocks as input data. ### Claim 12 A method of controlling a display apparatus including a liquid crystal panel, and a backlight unit including a plurality of light sources configured to emit light to the liquid crystal panel, the method comprising: identifying a plurality of dimming blocks, each of which comprises at least one light source among the plurality of light sources; generating a dimming signal according to luminance values obtained from an input image; predicting a temperature for each of the plurality of dimming blocks based on the dimming signal and current-specific temperature profile information corresponding to the plurality of dimming blocks; updating the dimming signal based on the temperature predicted for each of the plurality of dimming blocks; and controlling a supply current for each of the plurality of dimming blocks based on the dimming signal. ### Claim 13 (depends on 12) The method of claim 12, wherein the plurality of dimming blocks includes a first dimming block and a second dimming block, wherein the dimming signal includes a first dimming signal corresponding to the first dimming block and a second dimming signal corresponding to the second dimming block, and wherein the updating the dimming signal comprises: updating the first dimming signal to reduce a first supply current of the first dimming block based on a first predicted temperature for the first dimming block being higher than or equal to a preset value; and updating the second dimming signal to increase a second supply current of the second dimming block based on a second predicted temperature for the second dimming block being lower than the preset value. ### Claim 14 (depends on 13) The method of claim 13, wherein the updating the dimming signal comprises: identifying a weight of each of the plurality of dimming blocks based on the temperature predicted for each of the plurality of dimming blocks; identifying an average cumulative current for each of the plurality of dimming blocks when outputting the input image; and updating the dimming signal to control the supply current for each of the plurality of dimming blocks based on a comparison of a preset reference current and the average cumulative current adjusted by the weight. ### Claim 15 (depends on 14) The method of claim 14, wherein the updating the dimming signal comprises, based on the average cumulative current adjusted by the weight for a third dimming block, among the plurality of dimming blocks, being greater than or equal to the preset reference current, updating the dimming signal to decrease a current supplied to the third dimming block. ### Claim 16 (depends on 14) The method of claim 14, wherein the updating the dimming signal comprises, based on the average cumulative current adjusted by the weight for a third dimming block, among the plurality of dimming blocks, being less than the preset reference current, updating the dimming signal to increase a current supplied to the third dimming block. ### Claim 17 (depends on 14) The method of claim 14, wherein the updating the dimming signal comprises: identifying the weight of the first dimming block to decrease the average cumulative current for the first dimming block; and identifying the weight of the second dimming block to decrease the average cumulative current for the second dimming block. ### Claim 18 (depends on 13) The method of claim 13, wherein the updating the dimming signal comprises: dividing the plurality of dimming blocks into a plurality of groups; identifying a weight that is shared by the plurality of dimming blocks provided in a first group of the plurality of groups based on a predicted temperature of a center dimming block in the first group; identifying an average cumulative current of the center dimming block in the first group; and updating the dimming signal to control each of the plurality of dimming blocks provided in the first group based on the weight and the average cumulative current of the center dimming block. ### Claim 19 (depends on 12) The method of claim 12, wherein the current-specific temperature profile information comprises information obtained by measuring a temperature change in a dimming block at a plurality of different current values over time during a first period from a first point in time at which supply of a current to the dimming block is started to a second point in time at which the supply of the current to the dimming block is interrupted, and a second period from the second point in time to a third point in time. ### Claim 20 (depends on 12) The method of claim 12, wherein the predicting the temperature for each of the plurality of dimming blocks comprises providing is performed based on an output of a neural network that uses the dimming signal corresponding to the input image and the current-specific temperature profile information of the plurality of dimming blocks as input data.