# US 10,871,264 B2 · Dual CCT automotive headlight > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,871,264 B2 - Document ID: US10871264B2 - Status: Granted - Kind: B2 - Application number: 16/712,465 - Filed: 2019-12-12 - Published: 2020-06-18 - Granted: 2020-12-22 - Earliest claimed: 2018-12-13 - Assignees: Lumileds Holding B.V. - Applicants: Lumileds Holding B.V. - Inventors: Ying Huang; Colin Huang; Jimmy Xiao; Bao Wang; Benno Spinger - Web page: https://patentgrep.com/patent/US10871264B2 ## CPC - F21S 41/125: Coloured light - F21S 41/663: by switching light sources (by switching incandescent light sources F21S41/162) - F21S 41/141: Light emitting diodes [LED] - F21S 41/153: arranged in a matrix - F21S 41/322: {the reflector using total internal reflection} - F21S 43/249: with two or more light sources being coupled into the light guide - F21S 43/2492: {having two or more input branches} - H10W 90/00: Package configurations - B60Q 2400/20: Multi-color single source or LED matrix, e.g. yellow blinker and red brake lamp generated by single lamp - F21Y 2115/10: Light-emitting diodes [LED] - H10H 20/882: {Scattering means (H10H20/82 takes precedence)} - 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 - B60Q: ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL - 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 - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS ## Abstract A dual CCT automotive headlight is described herein, comprising: at least one first LED configured to emit light of a first color; at least one second LED configured to emit light of a second color different from the first color; a light mixing device arranged to receive and mix light from the at least one first LED and the at least one second LED and to emit the mixed light. The dual CCT automotive headlight can not only provide homogeneous light of the first color and homogeneous light of the second color, but can also provide homogeneous light of a mixed color. ## Claims ### Claim 1 A dual CCT automotive headlight, comprising: at least one first LED configured to emit light of a first color; at least one second LED configured to emit light of a second color different from the first color; a light mixing device arranged to receive and mix light from the at least one first LED and the at least one second LED and to emit the mixed light, wherein the light mixing device comprises: a body made of a material having a higher refractive index than air and comprising scattering particles distributed within the material; wherein, the outer surface of the body comprises a light incident area and a light emergent area, the light incident area being arranged to receive the light from the at least one first LED and the at least one second LED; and the material and the scattering particles are arranged for mixing the received light and emitting the mixed light from the light emergent area, wherein the light emergent area is smaller than the light incident area. ### Claim 2 (depends on 1) The dual CCT automotive headlight according to claim 1, wherein the light emergent area has a rectangle shape with a length ranging from 3.8 mm to 4.4 mm and a width ranging from 1.1 mm to 1.7 mm. ### Claim 3 (depends on 1) The dual CCT automotive headlight according to claim 1, wherein a cross-sectional shape of the body along a direction from the light emergent area to the light incident area is axisymmetric. ### Claim 4 (depends on 3) The dual CCT automotive headlight according to claim 3, wherein the cross-sectional shape of the body along a direction from the light emergent area to the light incident area is an isosceles trapezoid. ### Claim 5 (depends on 4) The dual CCT automotive headlight according to claim 4, wherein the isosceles trapezoid has a height (h) of less than 2 mm. ### Claim 6 (depends on 1) The dual CCT automotive headlight according to claim 1, wherein the light mixing device further comprises: a reflector provided on an area of the outer surface of the body between the light emergent area and the light incident area and configured to reflect light incident thereon back into the body. ### Claim 7 (depends on 6) The dual CCT automotive headlight according to claim 6, wherein the reflectivity of the reflector is greater than 95%. ### Claim 8 (depends on 1) The dual CCT automotive headlight according to claim 1, wherein the transmittance of the body is greater than 75%. ### Claim 9 (depends on 1) The dual CCT automotive headlight according to claim 1, further comprising: a controller configured to be empowered via an external switch, and to control the at least one first LED and the at least one second LED to emit light at the same time. ### Claim 10 (depends on 9) The dual CCT automotive headlight according to claim 9, wherein the light of the first color comprises cool white light and the light of the second color comprises amber light. ### Claim 11 (depends on 10) The dual CCT automotive headlight according to claim 10, wherein the luminous flux of the cool white light ranges from 1080 to 1320 lumens, and the luminous flux of the amber light ranges from 135 to 165 lumens. ### Claim 12 (depends on 1) The dual CCT automotive headlight according to claim 1, comprising a plurality of first LEDs and a plurality of second LEDs arranged in an array in which the first LEDs alternate with the second LEDs. ### Claim 13 (depends on 12) The dual CCT automotive headlight according to claim 12, wherein the light emergent area of the body is smaller than a light emitting area of the array.