Vehicle Display Thermal Path Using Sapphire Glass and Heat Pipe
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Solution Overview
Problem
Conventional vehicle display devices face challenges in effectively dissipating heat generated by the liquid crystal display element, leading to temperature increases that can affect performance and longevity.
Innovation Solution
A vehicle display device incorporating a heat-conductive plate member, such as sapphire glass, in contact with the liquid crystal display element, coupled with a heat pipe that transfers heat to a heat dissipation part, such as a metal housing, to efficiently dissipate heat and suppress temperature rise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional heat dissipation structure with separate heat dissipation member and heat-conductive member is used, then heat can be dissipated from the driving circuit, but the liquid crystal display element temperature increases and bleaching occurs
Solution Approach 1:
The patent combines the heat-conductive plate member and heat dissipation part into an integrated heat dissipation structure. The heat-conductive plate is directly coupled to the liquid crystal display element, and the heat dissipation part is directly coupled to the heat-conductive plate, creating a unified thermal management system that reduces thermal resistance and improves heat dissipation efficiency, thereby suppressing temperature increase and preventing bleaching of the display element.
2Temperature
If heat dissipation components are added to suppress temperature increase, then temperature control improves, but device complexity and size increase
Solution Approach 1:
The patent integrates multiple heat dissipation functions into a unified structure where the heat-conductive plate member and heat dissipation part work as an integrated system. This merging approach reduces the number of separate components and simplifies the overall heat dissipation structure while maintaining effective temperature control of the liquid crystal display element.
Solution Approach 2:
The heat-conductive plate member serves multiple functions: it acts as both a heat conduction path from the display element and as a structural support component. The housing structure simultaneously provides mechanical protection and heat dissipation functions. This multi-functionality reduces the need for additional dedicated heat dissipation components, thereby reducing device complexity.
3Reliability
If traditional heat dissipation methods are used, then heat can be removed from the driving circuit, but the liquid crystal display element still experiences temperature increase affecting performance
Solution Approach 1:
The heat-conductive plate member acts as an intermediary thermal management component positioned between the liquid crystal display element and the heat dissipation part. This intermediary structure provides a dedicated heat conduction path that directly addresses the thermal needs of the display element, improving its temperature control and performance reliability independent of the driving circuit heat dissipation.
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 solution effectively conducts heat away from the liquid crystal display element, reducing temperature increases and preventing bleaching, while minimizing component count and size, thus enhancing device performance and reliability.
Implementation Method 1
a heat-conductive plate member with a transparent plate shape that is disposed in contact with any of a display surface and a rear surface of the liquid crystal display element
Implementation Method 2
a heat pipe that has one end connected to an edge part of the heat-conductive plate member and the other end connected to the heat dissipation part, and conducts heat of the heat-conductive plate member to the heat dissipation part
Implementation Method 3
a mirror that is accommodated in the housing and reflects display light output from the liquid crystal display element toward a transparent reflection member of a vehicle
Data Source
AI summary
A vehicle display device includes a housing, a TFT that is accommodated in the housing, a mirror that is accommodated in the housing and reflects display light output from the TFT toward a windshield of a vehicle, a sapphire glass with a transparent plate shape that is disposed in contact with a display surface of the TFT, a lower case that functions as a heat dissipation part that dissipates heat, and a heat pipe that has one end connected to an edge part of the sapphire glass and the other end connected to the lower case, and conducts heat of the sapphire glass to the lower case.