# US 10,312,421 B2 · White light source device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,312,421 B2 - Document ID: US10312421B2 - Status: Granted - Kind: B2 - Application number: 15/696,198 - Filed: 2017-09-06 - Published: 2018-04-19 - Granted: 2019-06-04 - Earliest claimed: 2016-10-19 - Assignees: Lextar Electronics Corporation - Applicants: Lextar Electronics Corporation - Inventors: Cheng-Ping Chang; Zong-Han Yu - Web page: https://patentgrep.com/patent/US10312421B2 ## CPC - H10H 20/8515: {not being in contact with the bodies} - H10W 90/00: Package configurations - F21Y 2115/10: Light-emitting diodes [LED] - H10H 20/8506: {Containers} - H10H 20/8513: {having two or more wavelength conversion materials} - H10H 20/853: characterised by their shape - H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 - F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED ## Abstract A white light source device includes a first light-emitting element, and at least one second light-emitting element. The first light-emitting element includes a first light-emitting unit and a first wavelength conversion unit, and emits a first light beam. Each of the second light-emitting elements includes a second light-emitting unit and a second wavelength conversion unit, and emits a second light beam. An emission spectrum of the second light beam is different from an emission spectrum of the first light beam. The first light beam and the second light beam are mixed into a white light beam, and a color fidelity index of the white light beam is greater than 90. ## Claims ### Claim 1 A white light source device, comprising: a first light-emitting element having a first wavelength conversion unit and a first light-emitting unit in the first wavelength conversion unit, wherein the first light-emitting element emits a first light beam; and at least a second light-emitting element, wherein each of the second light-emitting elements has a second wavelength conversion unit and a second light-emitting unit in the second wavelength conversion unit, a top surface of the first wavelength conversion unit and a top surface of the second wavelength conversion unit are free from coverage of a molding structure, each of the second light-emitting elements emits a second light beam, an emission spectrum of the second light beam is different from an emission spectrum of the first light beam, and each of the first light-emitting element and the second light-emitting element are spaced apart from each other; wherein the first light beam has a first emission-wavelength peak and a second emission-wavelength peak, a wavelength range of the first emission-wavelength peak is between 450 nm and 462.5 nm, and a wavelength range of the second emission-wavelength peak is between 462.5 nm and 500 nm. The first light beam and the second light beam are mixed into a white light beam. ### Claim 2 (depends on 1) The white light source device of claim 1, wherein the first light-emitting unit and the second light-emitting unit are blue LEDs. ### Claim 3 (depends on 1) The white light source device of claim 1, wherein the first wavelength conversion unit comprises a single type of phosphors. ### Claim 4 (depends on 3) The white light source device of claim 3, wherein the first wavelength conversion unit comprises blue-green phosphors. ### Claim 5 (depends on 3) The white light source device of claim 3, wherein the second wavelength conversion unit comprises two types of phosphors. ### Claim 6 (depends on 5) The white light source device of claim 5, wherein the second wavelength conversion unit comprises red phosphors and green phosphors. ### Claim 7 (depends on 1) The white light source device of claim 1, wherein an amount of the at least one second light-emitting elements is more than one, wherein part of the second wavelength conversion units comprises green phosphors and another part of the second wavelength conversion units comprises red phosphors. ### Claim 8 A white light source device, comprising: a first light-emitting element having a first wavelength conversion unit and a first light-emitting unit in the first wavelength conversion unit, wherein the first light-emitting element emits a first light beam; and at least a second light-emitting element, wherein each of the second light-emitting elements has a second wavelength conversion unit and a second light-emitting unit in the second wavelength conversion unit, a top surface of the first wavelength conversion unit and a top surface of the second wavelength conversion unit are free from coverage of a molding structure, the second light-emitting element emits a second light beam, an emission spectrum of the second light beam is different from an emission spectrum of the first light beam, and each of the first light-emitting element and the second light-emitting element are spaced apart from each other; wherein the first light beam and the second light beam are mixed into a white light beam, and a color fidelity index of the white light beam is greater than 90. ### Claim 9 (depends on 8) The white light source device of claim 8, wherein the first light-emitting unit and the second light-emitting unit are blue LEDs. ### Claim 10 (depends on 8) The white light source device of claim 8, wherein the first wavelength conversion unit comprises a single type of phosphors. ### Claim 11 (depends on 10) The white light source device of claim 10, wherein the first wavelength conversion unit comprises blue-green phosphors. ### Claim 12 (depends on 10) The white light source device of claim 10, wherein the second wavelength conversion unit comprises two types of phosphors. ### Claim 13 (depends on 12) The white light source device of claim 12, wherein the second wavelength conversion unit comprises red phosphors and green phosphors. ### Claim 14 (depends on 8) The white light source device of claim 8, wherein an amount of the at least one second light-emitting elements is more than one, wherein part of the second wavelength conversion units comprises green phosphors and another part of the second wavelength conversion units comprises red phosphors. ### Claim 15 A white light source device, comprising: a first light-emitting element having a first wavelength conversion unit and a first light-emitting unit in the first wavelength conversion unit, wherein the first light-emitting element emits a first light beam; and at least a second light-emitting element, wherein each of the second light-emitting elements has a second wavelength conversion unit and a second light-emitting unit in the second wavelength conversion unit, a top surface of the first wavelength conversion unit and a top surface of the second wavelength conversion unit are free from coverage of a molding structure, the second light-emitting element emits a second light beam, an emission spectrum of the second light beam is different from an emission spectrum of the first light beam, and each of the first light-emitting element and the second light-emitting element are spaced apart from each other; wherein the first light beam and the second light beam are mixed into a white light beam, and color rendering indexes of Color Evaluation Samples (CES) 64 - CES78 of the white light beam are greater than 90. ### Claim 16 (depends on 15) The white light source device of claim 15, wherein the first light-emitting unit and the second light-emitting unit are blue LEDs. ### Claim 17 (depends on 15) The white light source device of claim 15, wherein the first wavelength conversion unit comprises a single type of phosphors. ### Claim 18 (depends on 17) The white light source device of claim 17, wherein the first wavelength conversion unit comprises blue-green phosphors. ### Claim 19 (depends on 17) The white light source device of claim 17, wherein the second wavelength conversion unit comprises two types of phosphors. ### Claim 20 (depends on 19) The white light source device of claim 19, wherein the second wavelength conversion unit comprises red phosphors and green phosphors. ### Claim 21 (depends on 15) The white light source device of claim 15, wherein an amount of the at least one second light-emitting elements is more than one, wherein part of the second wavelength conversion units comprises green phosphors and another part of the second wavelength conversion units comprises red phosphors.