# US 8,786,541 B2 · Light emission control device and method, light emission device, image display device, program, and recording medium > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,786,541 B2 - Document ID: US8786541B2 - Status: Granted - Kind: B2 - Application number: 13/984,754 - Filed: 2011-12-05 - Published: 2013-12-05 - Granted: 2014-07-22 - Earliest claimed: 2011-02-09 - Assignees: Mitsubishi Electric Corporation - Applicants: Akinori Heishi; Satoshi Yamanaka; Hideki Yoshii - Inventors: Akinori Heishi; Satoshi Yamanaka; Hideki Yoshii - Web page: https://patentgrep.com/patent/US8786541B2 ## CPC - G09G 5/10: Intensity circuits - G09G 3/3426: {the different display panel areas being distributed in two dimensions, e.g. matrix} - G09G 2320/0238: Improving the black level - G09G 2360/16: Calculation or use of calculated indices related to luminance levels in display data - 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 light emission control device includes a partial region feature quantity detector, an enlarged region feature quantity detector, a whole screen feature quantity detector, and a light emission controller. The partial region feature quantity detector detects a feature quantity of the image as a partial region feature quantity. The enlarged region feature quantity detector defines the partial region of interest and the partial regions neighboring the partial region of interest, and detects a feature quantity of the image of the enlarged region. The whole screen feature quantity detector detects this feature quantity as a whole screen feature quantity. On the basis of the partial region feature quantity and the enlarged region feature quantity pertaining to the partial region of interest, and the whole screen feature quantity, the light emission controller controls the light emission luminance of the light emission unit corresponding to the partial region of interest. ## Claims ### Claim 1 A light emission control device for controlling light emission units irradiating respective ones of partial regions formed by dividing a display screen of an optical modulation unit for displaying an image by optically modulating illuminating light responsive to image data, such that light emission luminance of each of the partial regions can be controlled; said light emission control device comprising: a partial region feature quantity detector that defines each of the partial regions as a partial region of interest, and detects a feature quantity of the partial region of interest, as a partial region feature quantity; an enlarged region feature quantity detector that detects a feature quantity of an enlarged region including the partial region of interest, and a partial region neighboring the partial region of interest, as an enlarged region feature quantity pertaining to the partial region of interest, a whole screen feature quantity detector that detects a feature quantity of entirety of the image represented by the image data, as a whole screen feature quantity; and a light emission controller that controls light emission luminance of the light emission unit corresponding to the partial region of interest, on the basis of the partial region feature quantity pertaining to the partial region of interest, the enlarged region feature quantity pertaining to the partial region of interest, and the whole screen feature quantity. ### Claim 2 (depends on 1) The light emission control device of claim 1, wherein the enlarged region feature quantity pertaining to the partial region of interest is obtained by uniform processing on the partial region feature quantity pertaining to the partial region of interest, and the partial region feature quantity of the partial region neighboring the partial region of interest, without weighting the partial region quantities. ### Claim 3 (depends on 1) The light emission control device of claim 1, wherein the light emission controller comprises: a light-emission control data generator that generates light-emission control data for controlling the light emission luminance of the light emission unit corresponding to the partial region of interest, on the basis of the partial region feature quantity and the enlarged region feature quantity pertaining to the partial region of interest, and the whole screen feature quantity; and a light emission driver that causes the light emission unit to emit light at light emission luminance corresponding to the light-emission control data for the light emission unit, generated by the light-emission control data generator. ### Claim 4 (depends on 3) The light emission control device of claim 3, wherein the light-emission control data generator generates whole screen light-emission control data by conversion from the whole screen feature quantity, generates, for each of the plurality of partial regions, partial region deviation amount data pertaining to the partial region of interest by taking a difference between the partial region feature quantity pertaining to the partial region of interest, and the whole screen feature quantity, generates enlarged region deviation amount data pertaining to the partial region of interest, by taking a difference between the enlarged region feature quantity pertaining to the enlarged region including the partial region of interest, and the whole screen feature quantity, generates the light-emission control data pertaining to the partial region of interest from the whole screen light-emission control data, and the partial region deviation amount data and the enlarged region deviation amount data pertaining to the partial region of interest. ### Claim 5 (depends on 4) The light emission control device of claim 4, wherein the whole screen feature quantity includes a first type of whole screen feature quantity, and a second type of whole screen feature quantity, the second type being different from the first type, and the second type of the whole screen feature quantity and the partial region feature quantity and the enlarged region feature quantity are of the same type. ### Claim 6 (depends on 1) A light emission device comprising the light emission control device of claim 1, and a plurality of light emission units whose light emission luminance is controlled by the light emission control device. ### Claim 7 (depends on 6) An image display device comprising the light emission device of claim 6, and the optical modulation unit for optically modulating the illuminating light emitted from the light emission unit, according to the image data, to display an image. ### Claim 8 A light emission control method for controlling light emission units irradiating respective ones of partial regions formed by dividing a display screen of an optical modulation unit for displaying an image by optically modulating illuminating light responsive to image data, such that light emission luminance of each of the partial regions can be controlled; said light emission control method comprising: a partial region feature quantity detecting step of defining each of the partial regions as a partial region of interest, and detecting a feature quantity of the partial region of interest, as a partial region feature quantity; an enlarged region feature quantity detecting step of detecting a feature quantity of an enlarged region including the partial region of interest, and a partial region neighboring the partial region of interest, as an enlarged region feature quantity pertaining to the partial region of interest, a whole screen feature quantity detecting step of detecting a feature quantity of entirety of the image represented by the image data, as a whole screen feature quantity; and a light emission controlling step of controlling light emission luminance of the light emission unit corresponding to the partial region of interest, on the basis of the partial region feature quantity pertaining to the partial region of interest, the enlarged region feature quantity pertaining to the partial region of interest, and the whole screen feature quantity. ### Claim 9 (depends on 8) A non-transitory computer-readable recording medium storing a program for having a computer implement the steps of the light emission control method of claim 8.