# US 10,371,877 B2 · Lighting device, display device, and television device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,371,877 B2 - Document ID: US10371877B2 - Status: Granted - Kind: B2 - Application number: 15/744,855 - Filed: 2016-09-23 - Published: 2018-07-26 - Granted: 2019-08-06 - Earliest claimed: 2015-09-24 - Assignees: Sharp Kabushiki Kaisha - Applicants: Sharp Kabushiki Kaisha - Inventors: Makoto Uno; Akira Gotou; Keitaro Matsui; Masanobu Harada - Web page: https://patentgrep.com/patent/US10371877B2 ## CPC - G02B 6/0023: {provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source} - H10H 20/8515: {not being in contact with the bodies} - 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 1/02: made of crystals, e.g. rock-salt, semi-conductors (G02B1/08 takes precedence) - G02B 5/021: {the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures} - G02B 5/0294: {adapted to provide an additional optical effect, e.g. anti-reflection or filter} - G02B 5/08: Mirrors {(vehicle mirrors involving special optical features B60R1/08)} - G02B 5/20: Filters (polarising elements G02B5/30) - G02B 5/201: {in the form of arrays} - G02B 5/223: {containing organic substances, e.g. dyes, inks or pigments} - G02B 5/26: Reflecting filters (G02B5/28 takes precedence) - G02B 6/0043: {provided on the surface of the light guide} - G02B 6/005: {provided by one optical element, or plurality thereof, placed on the light output side of the light guide} - G02B 6/0055: {Reflecting element, sheet or layer} - G02B 6/0061: {to provide homogeneous light output intensity} - G02B 6/0088: {of the light guide or other optical sheets in the package} - G02B 6/009: {of the light source in the package (G02B6/0021 takes precedence)} - H10H 20/851: Wavelength conversion means - G02B 5/0231: {the surface having microprismatic or micropyramidal shape (macroscopic prism arrays G02B5/045)} - G02B 6/0068: {Arrangements of plural sources, e.g. multi-colour light sources} - H10H 20/8514: {characterised by their shape, e.g. plate or foil} - H10W 90/00: Package configurations - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS - F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 ## Abstract A lighting device includes a light source array, a wavelength converting member, and a light guide plate. The light source array includes light sources configured to emit primary light rays. The wavelength converting member includes a wavelength converting portion, a holding portion, and non-wavelength converting portions. The wavelength converting portion contains phosphors configured to emit secondary light rays when excited by the primary light rays. The wavelength converting member is disposed between the light guide plate and the light source array. The light guide plate includes a light entering surface, a light exiting surface, an opposite surface that is on an opposite side from the light exiting surface, and a light reflecting and scattering pattern. The light reflecting and scattering pattern includes complementary color dots formed in sections of the opposite surface on non-wavelength converting portion sides. The complementary color dots absorb the primary light rays. ## Claims ### Claim 1 A lighting device comprising: a light source array comprising a plurality of light sources configured to emit primary light rays in a predefined wavelength range and arranged in line; and at least one wavelength converting member disposed along a length direction of the light source array to he opposed to the light source array, the at least one wavelength converting member comprising: a wavelength converting portion containing phosphors configured to emit secondary light rays in a wavelength range different from the wavelength range when excited by blue light rays; a holding portion holding the wavelength converting portion to surround the wavelength converting portion and having light transmissivity and an elongated shape; and a non-wavelength converting portion formed at an end of the holding portion with respect to a longitudinal direction of the holding portion and configured to pass the primary light rays emitted by the light sources; and a light guide plate, wherein the at least one wavelength converting member is disposed between the light guide plate and the light source array, the light guide plate comprises: a light entering surface through which light rays enter, the light rays including the primary light rays and the secondary light rays converted from the primary light rays emitted by the light sources and traveling through the at least one wavelength converting member from a light source side to a light guide plate side; a light exiting surface through which the light rays exit; an opposite surface disposed on an opposite side from the light exiting surface; and a light reflecting and scattering pattern having light reflectivity and a light scattering property, the light reflecting and scattering pattern including a plurality of dots formed to be two-dimensionally dispersed on the opposite surface, some of the dots being complementary color dots disposed along a light emitting direction of the light source on a light guide plate side of the non-wavelength converting portion and configured to absorb the primary light rays and exhibit a complementary color of a reference color exhibited by the primary light rays. ### Claim 2 (depends on 1) The lighting device according to claim 1, wherein the light reflecting and scattering pattern is defined such that a density per unit area on the opposite surface gradually increases as a distance from the light entering surface increases. ### Claim 3 (depends on 1) The lighting device according to claim 1, wherein the wavelength converting portion of the at least one wavelength converting member includes the phosphors dispersed in a transparent resin, the holding portion of the at least one wavelength converting member is a tube with closed ends, and the non-wavelength converting portion of the at least one wavelength converting member is at least one of the closed ends of the tube. ### Claim 4 (depends on 1) The lighting device according to claim 1, wherein the non-light converting portion that is the end of the at least one wavelength converting member is disposed closer to an adjacent end surface of the light guide plate adjacent to the light entering surface, the complementary color dots are formed on the opposite surface along an adjacent end portion of the light guide plate including the adjacent end surface, the at least one wavelength converting member includes wavelength converting members, the wavelength converting members are disposed in line in a longitudinal direction in a space between the light source array and the light entering surface, and the complementary color dots are formed on the opposite surface across the opposite surface along a light emitting direction of the light sources from a section in which the wavelength converting members are adjacent to each other. ### Claim 5 (depends on 1) A display device comprising: a lighting device according to claim 1; and a display panel configured to display an image using light from the lighting device. ### Claim 6 (depends on 5) A television device comprising the display device according to claim 5. ### Claim 7 A lighting device comprising: a light source array comprising a plurality of light sources configured to emit primary light rays in a predefined wavelength range and arranged in line; and at least one wavelength converting member disposed along a length direction of the light source array to be opposed to the light source array, the at least one wavelength converting member comprising: a wavelength converting portion containing phosphors configured to secondary light rays in a wavelength range different from the wavelength range when excited by blue light rays; a holding portion holding the wavelength converting portion to surround the wavelength converting portion and having light transmissivity and an elongated shape; and a non-wavelength converting portion formed at an end of the holding portion with respect to a longitudinal direction of the holding portion and configured to pass the primary light rays emitted by the light sources; and a light guide plate, wherein the at least one wavelength converting member is disposed between the light guide plate and the light source array, the light guide plate comprises: a light entering surface through which light rays enter, the light rays including the primary light rays and the secondary light rays converted from the primary light rays emitted by the light sources and traveling through the at least one wavelength converting member from a light source side to a light guide plate side; a light exiting surface through which the light rays exit; and an opposite surface disposed on an opposite side from the light exiting surface, and. the lighting device further comprises: a reflection member disposed to cover the opposite surface and configured to reflect light rays; and a complementary color member configured to exhibit a complementary color of a reference color exhibited by the primary light rays and disposed between the opposite surface and the reflection member to overlap a section of the opposite surface extending from the non-wavelength converting portion in a light emitting direction of the light sources. ### Claim 8 (depends on 7) The lighting device according to claim 7, wherein the wavelength converting portion of the at least one wavelength converting member includes the phosphors dispersed in a transparent resin, the holding portion of the at least one wavelength converting member is a tube with closed ends, and the non-wavelength converting portion of the at least one wavelength converting member is at least one of the closed ends of the tube. ### Claim 9 (depends on 7) The lighting device according to claim 7, wherein the non-light converting portion that is the end of the at least one wavelength converting member is disposed closer to an adjacent end surface of the guide plate adjacent to the light entering surface, and the complementary color member is disposed between the opposite surface and the reflection member along an adjacent end portion of the light guide plate including the adjacent end surface. ### Claim 10 (depends on 7) The lighting device according to claim 7, wherein the at least one wavelength converting member includes wavelength converting members, the wavelength converting members are disposed in line in a longitudinal direction in a space between the light source array and the light entering surface, and the complementary color member is disposed between the opposite surface and the reflection member across the opposite surface along a light emitting direction of the light sources from a section in which the wavelength converting members are adjacent to each other. ### Claim 11 (depends on 1) The lighting device according to claim 1, wherein the phosphors contained in the wavelength converting portion are quantum dot phosphors.