Edge-Lit Vehicle Display Backlight with Phase-Change Heat Transfer
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Solution Overview
Problem
Conventional motor vehicle display apparatuses face overheating issues due to inefficient thermal management, particularly in automotive applications where 60% of electrical power is dissipated as heat, leading to the need for heavy and expensive thermal conductivity materials like aluminum or magnesium alloys.
Innovation Solution
An edge-lit motor vehicle display apparatus with a backlight unit integrated with a heat transfer device featuring anterior and posterior capillary tubes connected by a C-shape connector, utilizing a phase changing medium to transfer heat through convection and conduction, allowing for efficient heat dissipation without the need for heavy thermal conductivity materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If materials with good thermal conductivity properties such as aluminum or magnesium alloy are used for housing, then heat dissipation efficiency is improved, but the display apparatus becomes heavy and expensive
Solution Approach 1:
The patent employs a phase change material (paraffin wax) that transitions between solid and liquid states to absorb and dissipate heat from the backlight unit. This phase transition mechanism enables effective thermal management without requiring heavy metallic housing materials, thereby resolving the contradiction between heat dissipation efficiency and apparatus weight
Solution Approach 2:
The patent introduces a heat transfer fluid (water or alcohol) as an intermediary substance that circulates through capillary tubes to transfer heat from the backlight unit to the phase change material. This intermediary mechanism enables efficient heat dissipation while avoiding the need for heavy thermal conductivity materials in the housing structure
2Temperature
If materials with good thermal conductivity properties such as aluminum or magnesium alloy are used for housing, then heat dissipation efficiency is improved, but the display apparatus becomes expensive
Solution Approach 1:
The patent employs a phase change material (paraffin wax) that transitions between solid and liquid states to absorb and dissipate heat from the backlight unit. This phase transition mechanism enables effective thermal management without requiring heavy metallic housing materials, thereby resolving the contradiction between heat dissipation efficiency and apparatus weight
Solution Approach 2:
The patent introduces a heat transfer fluid (water or alcohol) as an intermediary substance that circulates through capillary tubes to transfer heat from the backlight unit to the phase change material. This intermediary mechanism enables efficient heat dissipation while avoiding the need for heavy thermal conductivity materials in the housing structure
3Device complexity
If conventional radiation and convection through air are used for heat dissipation, then the structure is simple, but heat dissipation efficiency is insufficient leading to overheating
Solution Approach 1:
The patent utilizes capillary tubes filled with heat transfer fluid to conduct heat from the backlight unit. This hydraulic/pneumatic approach enables more efficient heat dissipation compared to simple air convection, while maintaining relatively simple device structure through the use of capillary action
Solution Approach 2:
The patent employs a phase change material (paraffin wax) that transitions between solid and liquid states to absorb and dissipate heat from the backlight unit. This phase transition mechanism enables effective thermal management without requiring heavy metallic housing materials, thereby resolving the contradiction between heat dissipation efficiency and apparatus weight
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The heat transfer device enhances heat dissipation efficiency by leveraging phase change and convection methods, achieving higher thermal conductivity than solid copper or aluminum, allowing for the use of lighter, less expensive materials in the display housing while maintaining effective temperature management.
Implementation Method 1
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
Implementation Method 2
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
Implementation Method 3
the walls of the heat transfer device transfer heat by conduction
Implementation Method 4
the phase changing medium transfer heat by convection
Data Source
AI summary
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.