# US 2019/0378469 A1 · Control device, electronic device, and control method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0378469 A1 - Document ID: US20190378469A1 - Status: Published application - Kind: A1 - Application number: 16/431,246 - Filed: 2019-06-04 - Published: 2019-12-12 - Earliest claimed: 2018-06-07 - Assignees: Sharp Kabushiki Kaisha - Applicants: Sharp Kabushiki Kaisha - Inventors: FUMITAKA SEKI; KENJI MAEDA - Web page: https://patentgrep.com/patent/US20190378469A1 ## 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 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)} - G02F 1/13306: {Circuit arrangements or driving methods for the control of single liquid crystal cells (G02F1/132, G02F1/133382 take precedence)} - G02F 1/133603: {with LEDs} - G09G 3/3607: {for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels (display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127)} - G09G 2320/0242: Compensation of deficiencies in the appearance of colours - G09G 2320/0252: Improving the response speed - G09G 2320/0257: Reduction of after-image effects - 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) - 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 ## Abstract The present invention relates to a light emitting device and achieves either desirable color reproduction or improved image quality of a moving image according to the usage of an electronic device. The electronic device includes a first light emitting device and a second light emitting device having color reproducibility lower than that of the first light emitting device and having a response speed faster than that of the first light emitting device, and a control device includes a light emission control section configured to control light emission of the first light emitting device and light emission of the second light emitting device according to a usage of the electronic device such that a relation between luminance of the first light emitting device and luminance of the second light emitting device satisfies a predetermined condition. ## Claims ### Claim 1 A control device for controlling an electronic device, the electronic device comprising: at least one first light emitting device; and at least one second light emitting device having color reproducibility lower than that of the first light emitting device and having a response speed faster than that of the first light emitting device, the control device comprising: a light emission control section configured to control light emission of the first light emitting device and light emission of the second light emitting device according to a usage of the electronic device such that a relation between luminance of the first light emitting device and luminance of the second light emitting device satisfies predetermined condition. ### Claim 2 (depends on 1) The control device according to claim 1, wherein: the light emission control section performs the control by adjusting a value of a current flowing through the first light emitting device and a value of a current flowing through the second light emitting device to numeric values other than zero. ### Claim 3 (depends on 1) The control device according to claim 1, wherein: in a case where the electronic device is operated for a usage in which the predetermined condition is a condition such that the luminance of the first light emitting device is lower than that of the second light emitting device, the light emission control section controls a light emission period of the second light emitting device such that the light emission period of the second light emitting device is longer than that of the first light emitting device. ### Claim 4 (depends on 1) The control device according to claim 1, wherein: the first light emitting device includes a plurality of first light emitting elements, the second light emitting device includes a plurality of second light emitting elements each having color reproducibility lower than that of each of the first light emitting elements and having a response speed faster than that of each of the first light emitting elements, in the electronic device, the first light emitting elements and the second light emitting elements are arranged so as to he adjacent to each other, the light emission control section controls light emission of each of the first light emitting elements and light emission of each of the second light emitting elements. ### Claim 5 (depends on 4) The control device according to claim 4, wherein: the first light emitting elements and the second light emitting elements are light emitting diodes, and the first light emitting device and the second light emitting device constitute at least a portion of a backlight contained in the electronic device. ### Claim 6 An electronic device comprising: at least one first light emitting device; at least one second light emitting device; and at least one control device, the second light emitting device having color reproducibility lower than that of the first light emitting device and having a response speed faster than that of the first light emitting device, the control device carrying out light emission control processing of controlling light emission of the first light emitting device and light emission of the second light emitting device according to a usage of the electronic device such that a relation between luminance of the first light emitting device and luminance of the second light emitting device satisfies a predetermined condition. ### Claim 7 A control method by which a control device controls an electronic device, the electronic device comprising: at least one first light emitting device; and at least one second light emitting device having color reproducibility lower than that of the first light emitting device and having a response speed faster than that of the first light emitting device, the control method comprising: a light emission control step of controlling light emission of the first light emitting device and light emission of the second light emitting device according to a usage of the electronic device such that a relation between luminance of the first light emitting device and luminance of the second light emitting device satisfies a predetermined condition.