# US 12,222,600 B2 · Display device and method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,222,600 B2 - Document ID: US12222600B2 - Status: Granted - Kind: B2 - Application number: 17/886,490 - Filed: 2022-08-12 - Published: 2022-12-01 - Granted: 2025-02-11 - Earliest claimed: 2020-02-14 - Assignees: Japan Display Inc. - Applicants: Japan Display Inc. - Inventors: Tsutomu Harada - Web page: https://patentgrep.com/patent/US12222600B2 ## CPC - G02F 1/133603: {with LEDs} - G09G 3/3426: {the different display panel areas being distributed in two dimensions, e.g. matrix} - F21S 2/00: Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction - G02F 1/133601: {for spatial active dimming} - G02F 1/133611: {including means for improving the brightness uniformity} - G02F 1/133612: {Electrical details} - G09G 3/3406: {Control of illumination source (illumination devices structurally associated with liquid crystal cells G02F1/1336)} - H05B 45/10: Controlling the intensity of the light - H05B 45/30: Driver circuits - H05B 45/44: with an active control inside an LED matrix - H05B 47/00: Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant - H05B 47/10: Controlling the light source - H05B 47/155: Coordinated control of two or more light sources - G09G 2310/0213: controlling the sequence of the scanning lines with respect to the patterns to be displayed, e.g. to save power - G09G 2310/0272: Details of drivers for data electrodes, the drivers communicating data to the pixels by means of a current - G09G 2310/04: Partial updating of the display screen - G09G 2320/064: by time modulation of the brightness of the illumination source - G09G 2320/0646: Modulation of illumination source brightness and image signal correlated to each other - 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) - F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL ## Abstract According to one embodiment, a display device includes a display panel including a display area which displays images, a plurality of light sources irradiating light to display an image on the display area and a control unit which sequentially causes the plurality of light source, which correspond to a plurality of areas divided from the display area, to emit light for each of the areas. The control unit repeatedly causes the light source, which corresponds to an area specified from the plurality of areas based on the image, to emit light during one frame period of displaying an image on the display area. ## Claims ### Claim 1 A display device comprising: a display panel including a display area which displays images; a plurality of light sources irradiating light to display an image on the display area; a control unit which sequentially causes the plurality of light sources, which corresponds to a plurality of areas divided from the display area, to emit light for each of the areas; and a plurality of switches provided for the plurality of areas, wherein the control unit repeatedly causes the light source, which corresponds to an area specified from the plurality of areas based on the image, to emit light during one frame period of displaying an image on the display area, the plurality of light sources are arranged in a matrix along a first direction and a second direction, the plurality of areas extend along the first direction and are aligned along the second direction, and anodes of the light sources corresponding to each of the plurality of areas are electrically connected to a switch provided for the area. ### Claim 2 (depends on 1) The display device of claim 1, wherein the image displayed on the display area includes a first image and a second image, and an area specified based on the first image is different from an area specified based on the second image. ### Claim 3 (depends on 1) The display device of claim 1, wherein the plurality of switches are configured to be set to an on state in a predetermined order based on the image. ### Claim 4 (depends on 1) The display device of claim 1, wherein the control unit includes a first control unit which causes a first light source of the plurality of light sources to emit light and a second control unit which causes a second light source different from the first light source of the plurality of light sources to emit light, the first control unit repeatedly causes the first light source which corresponds to the area specified based on the image to emit light during one frame period in which the image is displayed on the display area, and the second control unit repeatedly causes the second light source which correspond to the area specified based on the image during to emit light one frame period in which the image is displayed on the display area. ### Claim 5 (depends on 1) The display device of claim 1, wherein the display panel includes a liquid crystal layer, and the plurality of light sources are provided in a backlight disposed on a rear surface side of the display panel. ### Claim 6 (depends on 1) The display device of claim 1, wherein the display panel includes a plurality of pixels arranged in a matrix in the display area, and the plurality of light sources includes a plurality of light-emitting diode elements provided in accordance with the plurality of pixels. ### Claim 7 (depends on 1) The display device of claim 1, wherein the display panel includes a plurality of pixels arranged in a matrix in the display area, and the plurality of light sources include a plurality of organic electroluminescent elements provided in accordance with the plurality of pixels. ### Claim 8 A method executed by a display device comprising a display panel including a display area which displays images and a plurality of light sources irradiating light to display an image on the display area, the method comprising: when sequentially causing the plurality of light sources, which correspond to a plurality of areas divided from the display area, to emit light for each of the areas, repeatedly causing the light source, which corresponds to an area specified from the plurality of areas based on the image, to emit light during one frame period in which an image is displayed in the display area, wherein the display device comprises a plurality of switches provided for the plurality of areas, the plurality of light sources are arranged in a matrix along a first direction and a second direction, the plurality of areas extend along the first direction and are aligned along the second direction, and anodes of the light sources corresponding to each of the plurality of areas are electrically connected to a switch provided for the area. ### Claim 9 (depends on 8) The method of claim 8, wherein the image displayed on the display area includes a first image and a second image, and an area specified based on the first image is different from an area specified based on the second image. ### Claim 10 (depends on 8) The method of claim 8, wherein the plurality of switches are configured to be set to an on state in a predetermined order based on the image. ### Claim 11 (depends on 8) The method of claim 8, wherein the repeatedly causing the light sources to emit light, includes causing a first light source of the plurality of light sources to emit light and causing a second light source different from the first light source of the plurality of light sources to emit light, the causing the first light source to emit light, includes repeatedly causing the first light source which corresponds to the area specified based on the image to emit light during one frame period in which the image is displayed on the display area, and the causing the second light source to emit light, includes repeatedly causing the second light source which corresponds to the area specified based on the image to emit light during one frame period in which the image is displayed on the display area. ### Claim 12 (depends on 8) The method of claim 8, wherein the display panel includes a liquid crystal layer, and the plurality of light sources are provided in a backlight disposed on a rear surface side of the display panel. ### Claim 13 (depends on 8) The method of claim 8, wherein the display panel includes a plurality of pixels arranged in a matrix in the display area, and the plurality of light sources includes a plurality of light-emitting diode elements provided in accordance with the plurality of pixels. ### Claim 14 (depends on 8) The method of claim 8, wherein the display panel includes a plurality of pixels arranged in a matrix in the display area, and the plurality of light sources include a plurality of organic electroluminescent elements provided in accordance with the plurality of pixels.