Sheet Heat Conduction Member for HMD Thermal Management
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Solution Overview
Problem
Head-mounted displays (HMDs) face issues with inefficient heat radiation due to low contact area between shielding wires and heat absorbing members, leading to increased observer-side temperatures and discomfort during use.
Innovation Solution
A sheet-shaped heat conduction member is used to increase contact area with the image forming device, allowing efficient heat transfer to a holding member, which is then radiated externally, while minimizing stress and image shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a shielding wire is used as a heat conduction member, then the structure is simple, but the contact area between the heat conduction member and the heat absorbing member is reduced, resulting in low heat conduction efficiency
Solution Approach 1:
The patent transforms the heat conduction member from a one-dimensional wire structure to a two-dimensional sheet structure. This dimensional change significantly increases the contact area between the heat conduction member and the heat absorbing member, thereby improving heat conduction efficiency while maintaining structural simplicity
Solution Approach 2:
The patent employs a sheet-shaped heat conduction member that functions as a flexible thermal interface. This thin film structure provides large surface area contact with the heat absorbing member, enabling efficient heat transfer without adding significant structural complexity
2Device complexity
If a shielding wire is used to conduct heat, then the structure is simple, but stress from the shielding wire may cause the light source or liquid crystal panel to shift, resulting in image displacement
Solution Approach 1:
The sheet-shaped heat conduction member is flexible and can conform to the surface of the heat absorbing member without applying concentrated stress. This distributes the mechanical load over a larger area, preventing displacement of the light source or liquid crystal panel and maintaining image position accuracy
Solution Approach 2:
The patent replaces the mechanical wire-based heat conduction system with a sheet-based system that relies on thermal conduction through surface contact rather than mechanical tension. This substitution eliminates the stress-induced displacement problem while maintaining heat conduction functionality
3Device complexity
If heat from the light source is not efficiently radiated, then the structure remains simple, but heat transmits to the lateral side on the observer side, causing the observer to feel heat and deteriorating wearing comfort
Solution Approach 1:
The patent extracts heat from the light source region by introducing a dedicated sheet-shaped heat conduction member that specifically targets and removes heat before it can transmit to the observer side. This extraction of harmful thermal energy improves wearing comfort while maintaining overall structural simplicity
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 configuration enhances heat dissipation, reduces image shift, and improves the wearing comfort by effectively cooling the image forming devices and preventing observer-side heat buildup.
Implementation Method 1
The heat conduction member comes into contact with the image forming device so as to be capable of heat conduction, and transmits heat of the image forming device to the holding member
Data Source
AI summary
An image display device includes a display unit that displays an image so as to be visually recognized by an observer, a holding member that holds the display unit and has at least a portion thereof exposed to the outside, and a heat conduction member, having a sheet shape, which is connected to the holding member. The display unit includes an image forming device that forms the image. The heat conduction member comes into contact with the image forming device so as to be capable of heat conduction, and transmits heat of the image forming device to the holding member.