# US 12,181,705 B2 · Backlight unit for a motor vehicle display apparatus integrated with a heat transfer device and method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,181,705 B2 - Document ID: US12181705B2 - Status: Granted - Kind: B2 - Application number: 18/201,961 - Filed: 2023-05-25 - Published: 2023-11-30 - Granted: 2024-12-31 - Earliest claimed: 2022-05-25 - Assignees: Continental Automotive Technologies GmbH - Applicants: Continental Automotive Technologies GmbH - Inventors: Ling Chih (Daniel) Teng; Merilyn Ng; Huey Lin Joyce Ling; Zhixiong Jiang; Sheng Hoe Ching - Web page: https://patentgrep.com/patent/US12181705B2 ## CPC - G02B 6/0085: {Means for removing heat created by the light source from the package} - G02F 1/133628: {with cooling means} - G02B 6/0088: {of the light guide or other optical sheets in the package} - G02F 1/133615: {Edge-illuminating devices, i.e. illuminating from the side} - 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 ## Abstract A heat transfer device for integrating with a backlight unit for an edge-lit motor vehicle display apparatus includes an anterior capillary tube operable to integrate with a rear side of the backlight unit, the anterior capillary tube further operable to dissipate heat from an anterior of a backlight unit of a motor vehicle display. The heat transfer device further includes a posterior capillary tube operable to be positioned away from the backlight unit, the posterior capillary tube further operable to dissipate heat from a posterior of a backlight unit of a motor vehicle display. The heat transfer device further comprises a phase changing medium operable to fluidly transfer between the first capillary tube and the second pillar tube during a heat transfer process, where the phase changing medium is operable to phase change between a gaseous state and a liquid state during the heat transfer process. ## Claims ### Claim 1 An edge-lit motor vehicle display apparatus comprising: a backlight unit integrated with at least one heat transfer device, the at least one heat transfer device comprising an anterior capillary tube operable to integrate with a rear side of the backlight unit, the anterior capillary tube further operable to dissipate heat from an anterior of the backlight unit, a posterior capillary tube operable to be positioned further away from the rear side of the backlight unit than the anterior tube, the posterior capillary tube further operable to dissipate heat from a posterior of the backlight unit, and a phase changing medium operable to fluidly transfer between the anterior capillary tube and the posterior capillary pillar tube during a heat transfer process, wherein the phase changing medium is operable to phase change between a gaseous state and a liquid state during the heat transfer process, to release latent heat from the rear side of the backlight unit. ### Claim 2 (depends on 1) The edge-lit motor vehicle display apparatus according to claim 1, wherein the anterior capillary tube and the posterior capillary tube are connected by a C-shape connector, thereby forming a U-shape heat transfer device having a gap between the anterior capillary tube and the posterior capillary tube. ### Claim 3 (depends on 2) The edge-lit motor vehicle display apparatus according to claim 2, wherein the C-shape connector has a bending radius of at least three times a diameter of the heat transfer device. ### Claim 4 (depends on 2) The edge-lit motor vehicle display apparatus according to claim 2, wherein the gap between the anterior capillary tube and the posterior capillary tube is at least 5 mm. ### Claim 5 (depends on 1) The edge-lit motor vehicle display apparatus according to claim 1, wherein the anterior capillary tube has a length of at least 150 mm. ### Claim 6 (depends on 1) The edge-lit motor vehicle display apparatus of claim 1, wherein the posterior capillary tube is at least partially positioned within a heat sink. ### Claim 7 (depends on 1) The edge-lit motor vehicle display apparatus according to claim 1, wherein during the heat transfer process, the phase changing medium vaporises to the gaseous state within the anterior capillary tube to dissipate heat from the anterior of the backlight unit; and the phase changing medium is fluidly transferred from the anterior capillary tube in the gaseous state to the posterior capillary tube. ### Claim 8 (depends on 7) The edge-lit motor vehicle display apparatus according to claim 7, wherein during the heat transfer process, in response to the phase changing medium being fluidly transferred to the posterior capillary tube, the phase changing medium condenses to the liquid state within the posterior capillary tube when latent heat is released from the phase changing medium. ### Claim 9 (depends on 1) The edge-lit motor vehicle display apparatus according to claim 1, wherein the anterior capillary tube further comprises a T-shape bar. ### Claim 10 (depends on 1) The edge-lit motor vehicle display apparatus according to claim 1, wherein the posterior capillary tube has a length shorter than the anterior capillary tube. ### Claim 11 A method of assembling an edge-light motor vehicle display apparatus for use in a motor vehicle, the method comprising: providing at least one heat transfer device, the at least one heat transfer device comprising an anterior capillary tube operable to integrate with a rear side of a backlight unit, the anterior capillary tube further operable to dissipate heat from an anterior of the backlight unit, a posterior capillary tube operable to be positioned further away from the rear side of the backlight unit than the anterior tube, the posterior capillary tube further operable to dissipate heat from a posterior of the backlight unit, and a phase changing medium operable to fluidly transfer between the anterior capillary tube and the posterior capillary pillar tube during a heat transfer process, wherein the phase changing medium is operable to phase change between a gaseous state and a liquid state during the heat transfer process, to release latent heat from the rear side of the backlight unit; providing a housing fora rear side of the motor vehicle display apparatus, the housing comprises at least one slot; and extending at least a portion of the at least one heat transfer device with the at least one slot of the housing, thereby yielding an edge-lit motor vehicle display apparatus integrated with at least one heat transfer device. ### Claim 12 (depends on 11) The method according to claim 11, wherein the at least a portion of the at least one heat transfer device is a T-shape bar. ### Claim 13 (depends on 12) The method according to claim 12, further comprising adhering an array of light emitting diodes along a length of the T-shape bar. ### Claim 14 (depends on 13) The method according to claim 13, further comprising fixing a light conductor adjacent to the T-shape bar, the light conductor for transmitting light rays towards a viewing area of the motor vehicle display apparatus. ### Claim 15 (depends on 14) The method according to claim 14, further comprising aligning the array of light emitting diodes along the length of the T-shape bar to a length of the light conductor, thereby providing a backlight unit for an edge-lit motor vehicle display.