HUD Display Thermal Path for Compact Liquid Crystal Cooling
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Solution Overview
Problem
Existing head-up displays (HUDs) face challenges in managing heat generated by both sunlight and backlights, leading to temperature rises that can damage liquid crystal panels, while being constrained by limited dashboard space.
Innovation Solution
The HUD incorporates a heat sink exposed outside the housing, connected via a thermally conductive plate with a higher thermal conductivity than air, forming an efficient heat dissipation path from the emission surface to the heat sink, using a single member to minimize interfacial resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a heat sink is added to dissipate heat from the backlight, then heat dissipation performance is improved, but device size increases
Solution Approach 1:
The patent combines the heat dissipation function with the existing housing structure by integrating a heat sink into the housing that accommodates the liquid crystal panel. This merging of functions allows heat dissipation without requiring separate additional components, thereby improving heat dissipation performance while avoiding increase in overall device size.
Solution Approach 2:
The housing structure is designed to serve multiple functions: it accommodates the liquid crystal panel, provides structural support, and simultaneously acts as a heat sink for dissipating heat from the backlight. This multi-functionality resolves the contradiction by making the existing structure do double duty, improving heat dissipation without adding volume.
2Ease of operation
If the HUD is downsized to fit dashboard space, then ease of installation is improved, but heat dissipation capability deteriorates
Solution Approach 1:
The patent applies local quality by concentrating heat dissipation functionality in specific regions of the housing rather than requiring uniform heat dissipation throughout the entire device. The heat sink is strategically positioned and designed with specific thermal conductivity characteristics in critical areas, allowing effective heat dissipation in a compact form factor suitable for dashboard installation.
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
This design effectively reduces the temperature of the liquid crystal panel and backlight, maintaining heat resistance and downsizing the HUD without increasing its physical size.
Implementation Method 1
a heat sink that dissipates heat generated from the backlight
Implementation Method 2
the plate being formed of a material having a thermal conductivity higher than that of air and provided with an emission surface exhaust heat path
Data Source
AI summary
A head up display device includes a backlight, a display element, a plate for holding the display element, a heat dissipation portion that dissipates heat generated from the display element, and a mirror for reflecting an image light emitted from the display element. The plate has a member which is substantially parallel to an emission surface of the display element and is mounted to the display element via a material having a thermal conductivity higher than that of air.