# US 10,504,456 B2 · Display control apparatus and display control method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,504,456 B2 - Document ID: US10504456B2 - Status: Granted - Kind: B2 - Application number: 15/578,297 - Filed: 2016-07-15 - Published: 2018-05-24 - Granted: 2019-12-10 - Earliest claimed: 2015-07-30 - Assignees: Sony Corporation - Applicants: Sony Corporation - Inventors: Hiroyuki Inokawa - Web page: https://patentgrep.com/patent/US10504456B2 ## CPC - G09G 3/342: {using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines} - G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED] - G09G 3/3225: using an active matrix - G09G 2320/0271: Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping - G09G 2330/045: Protection against panel overheating - G09G 2360/16: Calculation or use of calculated indices related to luminance levels in display data - H04N 5/57: Control of contrast or brightness - 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) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract The present disclosure relates to a display control apparatus that enables a rise in surface temperature of a display apparatus to be suppressed by lowering a gain value of a high-luminance area, and a display control method. A display control apparatus according to an aspect of the present disclosure includes: a high-luminance area detection unit that sets a measurement area on a screen of the video signal, calculates an APL value of the set measurement area, and detects a high-luminance area on the basis of a result of a comparison between the calculated APL value and a threshold value; a control unit that causes a LUT, in which an APL value of each pixel is an input and a gain value is an output, to be generated on the basis of the APL value of the detected high-luminance area; an APL value calculation unit that calculates the APL value of each pixel on the basis of pixel values of the video signal; a LUT unit that generates the LUT under control of the control unit and references the generated LUT to output the gain value corresponding to the calculated APL value of each pixel; and a multiplication unit that multiplies the pixel values of the video signal by the output gain value. The present disclosure is applicable to a video monitor. ## Claims ### Claim 1 A display control apparatus, comprising: processing circuitry configured to set a measurement area of an image of a video signal, calculate an average picture level (APL) value of the set measurement area, and detect a high-luminance area on the basis of a result of a comparison between the calculated APL value and a threshold value at which a temperature of the set measurement area on a reference display is determined to exceed a predetermined temperature. ### Claim 2 (depends on 1) The display control apparatus according to claim 1, wherein the threshold value is set on the basis of an actual measurement where temperatures of set measurement areas on the reference display with different sizes are measured corresponding to each of a series of possible APL values applied to the set measurement areas. ### Claim 3 (depends on 1) The display control apparatus according to claim 1, wherein the processing circuitry is further configured to: set multiple measurement areas of the image of the video signal, calculate multiple APL values of the multiple set measurement areas, and detect the high-luminance area on the basis of a result of a comparison between a maximum value of the calculated multiple APL values and the threshold value. ### Claim 4 (depends on 1) The display control apparatus according to claim 1, wherein the processing circuitry is further configured to: set measurement areas of different sizes of the image of the video signal, calculate APL values of each of the set measurement areas, and detect the high-luminance area on the basis of the result of a comparison between the calculated APL values and the threshold value. ### Claim 5 (depends on 1) The display control apparatus according to claim 1, wherein the processing circuitry is further configured to: determine a gain value with which the APL value of the detected high-luminance area can be lowered to a predetermined value, and notify a look up table (LUT) circuit of the determined gain value. ### Claim 6 (depends on 5) The display control apparatus according to claim 5, wherein the predetermined value is set on the basis of an actual measurement. ### Claim 7 (depends on 1) The display control apparatus according to claim 1, wherein the processing circuitry is further configured to: in response to high-luminance areas of the same size being consecutively detected at the same position on the image, generate a nonlinear LUT, in which an APL value of each pixel is an input and a gain value is an output, on the basis of the APL value of the detected high-luminance area that is one of the high-luminance areas. ### Claim 8 (depends on 7) The display control apparatus according to claim 7, wherein the processing circuitry is further configured to: when no high-luminance areas of the same size at the same position on the image are detected during an interval, generate a linear LUT, in which an APL value of each pixel is an input and a gain value is an output. ### Claim 9 (depends on 1) The display control apparatus according to claim 1, wherein the processing circuitry is further configured to: indicate that a local luminance correction is being carried out at a position of the measurement area of the image. ### Claim 10 (depends on 1) The display control apparatus of claim 1, wherein the processing circuitry is further configured to: generate a LUT, in which an APL value of each pixel is an input and a gain value is an output, on the basis of the APL value of the detected high-luminance area; calculate the APL value of each pixel on the basis of pixel values of the video signal; output the gain value corresponding to the calculated APL value of each pixel based on the generated LUT; and multiply the pixel values of the video signal by the output gain value. ### Claim 11 (depends on 1) The display control apparatus according to claim 1, further comprising a light-emitting display panel to which the multiplied pixel values of the video signal are displayed. ### Claim 12 A display control method, comprising: setting a measurement area of an image of a video signal, calculating an average picture level (APL) value of the set measurement area; and detecting, by processing circuitry of a display control apparatus, a high-luminance area on the basis of a result of a comparison between the calculated APL value and a threshold value at which a temperature of the set measurement area on a reference display is determined to exceed a predetermined temperature. ### Claim 13 (depends on 12) The method of claim 12, further comprising: generating a look up table (LUT), in which an APL value of each pixel is an input and a gain value is an output, on the basis of the APL value of the detected high-luminance area; calculating the APL value of each pixel on the basis of pixel values of the video signal; output the gain value corresponding to the calculated APL value of each pixel based on the generated LUT; and multiplying the pixel values of the video signal by the output gain value. ### Claim 14 (depends on 12) The display control method according to claim 12, wherein the threshold value is set on the basis of an actual measurement where temperatures of set measurement areas on the reference display with different sizes are measured corresponding to each of a series of possible APL values applied to the set measurement areas. ### Claim 15 (depends on 12) The display control method according to claim 12, further comprising: setting multiple measurement areas of the image of the video signal; calculating multiple APL values of the multiple set measurement areas; and detecting the high-luminance area on the basis of a result of a comparison between a maximum value of the calculated multiple APL values and the threshold value. ### Claim 16 (depends on 12) The display control method according to claim 12, further comprising: setting measurement areas of different sizes of the image of the video signal; calculating APL values of each of the set measurement areas; and detecting the high-luminance area on the basis of the result of a comparison between the calculated APL values and the threshold value. ### Claim 17 (depends on 12) The display control method according to claim 12, further comprising: determining a gain value with which the APL value of the detected high-luminance area can be lowered to a predetermined value, and notifying a LUT circuit of the determined gain value. ### Claim 18 (depends on 12) The display control method according to claim 12, wherein the predetermined value is set on the basis of an actual measurement. ### Claim 19 (depends on 12) The display control method according to claim 12, further comprising: in response to high-luminance areas of the same size being consecutively detected at the same position on the image, generating a nonlinear LUT, in which an APL value of each pixel is an input and a gain value is an output, on the basis of the APL value of the detected high-luminance area that is one of the high-luminance areas. ### Claim 20 (depends on 19) The display control method according to claim 19, further comprising: when no consecutive high-luminance areas of the same size at the same position on the image are detected during an interval, generating a linear LUT, in which an APL value of each pixel is an input and a gain value is an output.