# US 2018/0024006 A1 · Method of determining chromaticity rank of light emitting device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0024006 A1 - Document ID: US20180024006A1 - Status: Published application - Kind: A1 - Application number: 15/655,960 - Filed: 2017-07-21 - Published: 2018-01-25 - Earliest claimed: 2016-07-22 - Assignees: Nichia Corporation - Applicants: Nichia Corporation - Inventors: Seitaro AKAGAWA; Toshiyuki HASHIMOTO; Kentaro NISHIGAKI - Web page: https://patentgrep.com/patent/US20180024006A1 ## CPC - G01J 3/505: {measuring the colour produced by lighting fixtures other than screens, monitors, displays or CRTs} - B07C 5/342: according to optical properties, e.g. colour {(according to radiation transmittivity B07C5/3416)} - G01J 3/506: {measuring the colour produced by screens, monitors, displays or CRTs} - H10H 29/10: Integrated devices comprising at least one light-emitting semiconductor component covered by group H10H20/00 (active-matrix LED displays H10H29/30) - H10W 90/00: Package configurations - H10H 20/8512: {Wavelength conversion materials} - G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N) - B07C: POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING (specially adapted for a specific purpose covered by another class, see the relevant place, e.g. A43D33/06, B23Q7/12) - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 ## Abstract A method of determining a chromaticity rank of a light emitting device includes selecting the light emitting device having a chromaticity rank in a region surrounded by four defining points on a 1931 CIE Chromaticity Diagram. A ratio of a distance in a y-direction between, of the four defining points, two defining points furthest from each other in the y-direction to a distance in an x-direction between, of the four defining points, two defining points furthest from each other in the x-direction is 0.5 or less A peak light emission wavelength of the blue light emitting element is in a range of 447 to 452 nm, a peak light emission wavelength of the green light emitting element is in a range of 520 to 541 nm, and a peak light emission wavelength of the red light emitting element is in a range of 630 to 632 nm. ## Claims ### Claim 1 A method of determining a chromaticity rank of a light emitting device having a chromaticity so that a color display on a liquid crystal display board, for which the light emitting device is used, has a chromaticity in a predetermined chromaticity range, the method comprising: measuring a chromaticity of a light emitting device including a blue light emitting element, a green light emitting element, and a red light emitting element or a red fluorescent member; and selecting the light emitting device for use in a color display on a liquid crystal display board when the light emitting device has a chromaticity rank in a region surrounded by four defining points on a 1931 CIE Chromaticity Diagram, wherein a ratio of a distance in a y-direction between, of the four defining points, two defining points furthest from each other in the y-direction to a distance in an x-direction between, of the four defining points, two defining points furthest from each other in the x-direction is 0.5 or less, and wherein a peak light emission wavelength of the blue light emitting element is in a range of 447 to 452 nm, a peak light emission wavelength of the green light emitting element is in a range of 520 to 541 nm, and a peak light emission wavelength of the red light emitting element or the red fluorescent member is in a range of 630 to 632 nm. ### Claim 2 (depends on 1) The method of determining a chromaticity rank of a light emitting device according to claim 1, wherein the distance in the y-direction between, of the four defining points, the two defining points furthest from each other in the y-direction on the 1931 CIE Chromaticity Diagram is in a range of 0.01 to 0.015. ### Claim 3 (depends on 1) The method of determining a chromaticity rank of a light emitting device according to claim 1, wherein the four defining points in the region of the chromaticity rank include a first defining point, a second defining point, a third defining point, and a fourth defining point, and wherein the x and y coordinates of the first defining point are 0.255 and 0.2227, respectively, the x and y coordinates of the second defining point are 0.2607 and 0.2273, respectively, the x and y coordinates of the third defining point are 0.277 and 0.2233, respectively, and the x and y coordinates of the fourth defining point are 0.2713 and 0.2187, respectively. ### Claim 4 (depends on 1) The method of determining a chromaticity rank of a light emitting device according to claim 1, wherein an area of a light emission spectrum of the selected light emitting device in the 1931 CIE Chromaticity Diagram is adjusted. ### Claim 5 (depends on 1) The method of determining a chromaticity rank of a light emitting device according to claim 1, wherein a ratio of an optical output of the green light emitting element to an optical output of the blue light emitting element is in a range of 0.3 to 0.7. ### Claim 6 A method of manufacturing a light emitting device, the method comprising: providing a light emitting device including a blue light emitting element with a peak light emission wavelength in a range of 447 to 452 nm, a green light emitting element with a peak light emission wavelength in a range of 520 to 541 nm, and a red light emitting element or red fluorescent member with a peak light emission wavelength in a range of 630 to 632 nm; measuring a chromaticity of the light emitting device; and sorting the light emitting device into either of chromaticity ranks each having a predetermined range of chromaticity, wherein one of the chromaticity ranks is a region surrounded by four defining points on a 1931 CIE Chromaticity Diagram, and wherein a ratio of a distance in a y-direction between, of the four defining points, two defining points furthest from each other in the y-direction to a distance in an x-direction between, of the four defining points, two defining points furthest from each other in the x-direction is 0.5 or less. ### Claim 7 (depends on 6) The method according to claim 6, further comprising selecting the light emitting element for use in a color display on a liquid crystal display board when the light emitting device is sorting into the chromaticity rank that is the region surrounded by the four defining points on the 1931 CIE Chromaticity Diagram. ### Claim 8 (depends on 6) The method according to claim 6, wherein the distance in the y-direction between, of the four defining points, the two defining points furthest from each other in the y-direction on the 1931 CIE Chromaticity Diagram is in a range of 0.01 to 0.015. ### Claim 9 (depends on 6) The method according to claim 6, wherein the four defining points in the region of the chromaticity rank include a first defining point, a second defining point, a third defining point, and a fourth defining point, and wherein the x and y coordinates of the first defining point are 0.255 and 0.2227, respectively, the x and y coordinates of the second defining point are 0.2607 and 0.2273, respectively, the x and y coordinates of the third defining point are 0.277 and 0.2233, respectively, and the x and y coordinates of the fourth defining point are 0.2713 and 0.2187, respectively. ### Claim 10 (depends on 6) The method according to claim 6, wherein a ratio of an optical output of the green light emitting element to an optical output of the blue light emitting element is in a range of 0.3 to 0.7. ### Claim 11 A light emitting device comprising: a blue light emitting element; a green light emitting element; and a red light emitting element or a red fluorescent member, wherein the light emitting element has a chromaticity rank defined as a region surrounded by four defining points on a 1931 CIE Chromaticity Diagram, and a ratio of a distance in a y-direction between, of the four defining points, two defining points furthest from each other in the y-direction to a distance in an x-direction between, of the four defining points, two defining points furthest from each other in the x-direction is 0.5 or less. ### Claim 12 (depends on 11) The light emitting device according to claim 11, wherein the distance in the y-direction between, of the four defining points, the two points furthest from each other in the y-direction on the 1931 CIE Chromaticity Diagram is in a range of 0.01 to 0.015. ### Claim 13 (depends on 11) The light emitting device according to claim 11, wherein a peak light emission wavelength of the blue light emitting element is in a range of 447 to 452 nm, a peak light emission wavelength of the green light emitting element is in a range of 520 to 541 nm, and a peak light emission wavelength of the red light emitting element or the red fluorescent member is in a range of 630 to 632 nm. ### Claim 14 (depends on 11) The light emitting device according to claim 11, wherein the distance in the y-direction between, of the four defining points, the two defining points furthest from each other in the y-direction on the 1931 CIE Chromaticity Diagram is in a range of 0.01 to 0.015. ### Claim 15 (depends on 11) The light emitting device according to claim 11, wherein the four defining points in the region of the chromaticity rank include a first defining point, a second defining point, a third defining point, and a fourth defining point, and wherein the x and y coordinates of the first defining point are 0.255 and 0.2227, respectively, the x and y coordinates of the second defining point are 0.2607 and 0.2273, respectively, the x and y coordinates of the third defining point are 0.277 and 0.2233, respectively, and the x and y coordinates of the fourth defining point are 0.2713 and 0.2187, respectively. ### Claim 16 (depends on 11) The light emitting device according to claim 11, wherein a ratio of an optical output of the green light emitting element to an optical output of the blue light emitting element is in a range of 0.3 to 0.7.