# US 11,079,093 B2 · Light emitting device, display device, and lighting device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,079,093 B2 - Document ID: US11079093B2 - Status: Granted - Kind: B2 - Application number: 16/334,908 - Filed: 2017-07-25 - Published: 2019-09-19 - Granted: 2021-08-03 - Earliest claimed: 2016-10-07 - Assignees: Saturn Licensing LLC - Applicants: Saturn Licensing LLC - Inventors: Takeshi Yamamoto; Tomoyuki Yoshimatsu; Soya Araki; Naoki Tanaka - Web page: https://patentgrep.com/patent/US11079093B2 ## CPC - F21V 7/05: plane - 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 - G02B 5/0205: {characterised by the diffusing properties} - G02B 27/0977: {Reflective elements} - G02F 1/133605: {including specially adapted reflectors} - G02F 1/133606: {including a specially adapted diffusing, scattering or light controlling members} - H10H 20/851: Wavelength conversion means - H10H 20/855: Optical field-shaping means, e.g. lenses - H10H 20/856: Reflecting means - F21V 7/0083: {Array of reflectors for a cluster of light sources, e.g. arrangement of multiple light sources in one plane (combination of two or more reflectors F21V7/0025)} - G02F 1/133601: {for spatial active dimming} - G02F 1/133602: {Direct backlight} - G02F 1/133603: {with LEDs} - G02F 1/133614: {using photoluminescence, e.g. phosphors illuminated by UV or blue light} - G02F 2202/10: semiconductor - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - 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 - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS ## Abstract A light emitting device includes: a light emitting element; a reflection wall that surrounds the light emitting element; and a diffusion reflection sheet that includes a plurality of particles and permits entrance of emitted light from the light emitting element and reflected light from the reflection wall. ## Claims ### Claim 1 A light emitting device, comprising: a light emitting element comprising an LED (Light Emitting Diode); a light source substrate having a surface on which the light emitting element is disposed; a covering material that covers the light emitting element, the covering material having a refractive index between a refractive index of the light emitting element and a refractive index of air; a reflection wall that surrounds the light emitting element and is in contact with the surface of the light source substrate; a wavelength conversion sheet that faces the light source substrate; a diffusion reflection sheet that is in contact with the reflection wall and includes a plurality of particles and permits entrance of emitted light from the light emitting element and reflected light from the reflection wall, wherein the diffusion reflection sheet is formed as a single resin sheet printed with ink including the plurality of particles, and wherein the diffusion reflection sheet is disposed between the wavelength conversion sheet and the light source substrate; and an optical sheet provided between the diffusion reflection sheet and the wavelength conversion sheet. ### Claim 2 (depends on 1) The light emitting device according to claim 1, wherein at least some of the plurality of the particles have a hollow structure. ### Claim 3 (depends on 1) The light emitting device according to claim 1, wherein the plurality of the particles include hollow silica. ### Claim 4 (depends on 1) The light emitting device according to claim 1, wherein the reflection wall includes a shaped reflection sheet. ### Claim 5 (depends on 1) The light emitting device according to claim 1, wherein at least a portion of the reflection wall is disposed, between the light source substrate and the diffusion reflection sheet, in a direction crossing the light source substrate. ### Claim 6 (depends on 5) The light emitting device according to claim 5, wherein the light emitting element is of a side emission type. ### Claim 7 (depends on 1) The light emitting device according to claim 1, wherein the light emitting element is devoid of a package and a lens. ### Claim 8 (depends on 1) The light emitting device according to claim 1, wherein the light emitting device includes a plurality of segments partitioned by the reflection wall. ### Claim 9 (depends on 8) The light emitting device according to claim 8, wherein the plurality of the particles have a predetermined distribution pattern from segment to segment. ### Claim 10 (depends on 9) The light emitting device according to claim 9, wherein in the distribution pattern, the plurality of the particles is densified directly over the light emitting element. ### Claim 11 (depends on 8) The light emitting device according to claim 8, wherein a height of the reflection wall varies within a single one of the segments. ### Claim 12 (depends on 1) The light emitting device according to claim 1, wherein the light emitting element emits light of a blue wavelength range. ### Claim 13 A display device provided with a display panel and a light emitting device that illuminates the display panel, the light emitting device comprising: a light emitting element comprising an LED (Light Emitting Diode); a light source substrate having a surface on which the light emitting element is disposed; a covering material that covers the light emitting element, the covering material having a refractive index between a refractive index of the light emitting element and a refractive index of air; a reflection wall that surrounds the light emitting element and is in contact with the surface of the light source substrate; a wavelength conversion sheet that faces the light source substrate; a diffusion reflection sheet that is in contact with the reflection wall and includes a plurality of particles and permits entrance of emitted light from the light emitting element and reflected light from the reflection wall, wherein the diffusion reflection sheet is formed as a single resin sheet printed with ink including the plurality of particles, and wherein the diffusion reflection sheet is disposed between the wavelength conversion sheet and the light source substrate; and an optical sheet provided between the diffusion reflection sheet and the wavelength conversion sheet. ### Claim 14 (depends on 13) The display device according to claim 13, wherein the light emitting device includes a plurality of segments partitioned by the reflection wall, and wherein the plurality of the particles have a distribution pattern from segment to segment. ### Claim 15 A lighting device provided with a light emitting device, the light emitting device comprising: a light emitting element comprising an LED (Light Emitting Diode); a light source substrate having a surface on which the light emitting element is disposed; a covering material that covers the light emitting element, the covering material having a refractive index between a refractive index of the light emitting element and a refractive index of air; a reflection wall that surrounds the light emitting element and is in contact with the surface of the light source substrate; a wavelength conversion sheet that faces the light source substrate; a diffusion reflection sheet that is in contact with the reflection wall and includes a plurality of particles and permits entrance of emitted light from the light emitting element and reflected light from the reflection wall, wherein the diffusion reflection sheet is formed as a single resin sheet printed with ink including the plurality of particles, and wherein the diffusion reflection sheet is disposed between the wavelength conversion sheet and the light source substrate; and an optical sheet provided between the diffusion reflection sheet and the wavelength conversion sheet. ### Claim 16 (depends on 15) The lighting device according to claim 15, wherein the plurality of the particles have a distribution pattern in which the plurality of the particles is densified directly over the light emitting element.