Wearable Display Heat Dissipation Sheet Extraction

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Solution Overview

Problem

Wearable display devices face challenges in efficiently dissipating heat generated by the display elements, leading to potential performance deterioration and reduced operating life, especially when the housing unit is heated, causing a decrease in cooling efficiency.

Innovation Solution

A wearable display device design that incorporates a heat dissipation sheet extending outward through an opening in the outer packaging case, adhered to the side surface, utilizing a high-heat-conductivity graphite sheet to efficiently transmit heat away from the display element to the outer packaging case, thereby maintaining performance and extending the device's life.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If a sheet-shaped electrothermal heating member is adhered to an inside surface of a housing unit to transfer heat from the image display unit to the housing, then heat transfer efficiency is improved, but the housing unit becomes heated and cooling efficiency of the image display unit decreases

Engineering Contradiction:

Improveheat transfer efficiencyVSAvoidhousing unit temperature

Core Design Contradiction:

Loss of energyVSTemperature

Solution Approach 1:

The heat dissipation sheet is extracted from the internal housing structure and extended outward through an opening in the housing unit. This allows heat to be conducted away from the image display unit and dissipated to the external environment, preventing the housing unit from becoming heated while maintaining efficient heat transfer from the display unit.

Inventive Principle:

Principle #2Taking out (Extraction)

2Loss of energy

If heat is transferred efficiently from the image display unit to the housing unit, then heat dissipation is improved, but the inside of the housing becomes filled with heat

Engineering Contradiction:

Improveheat dissipation efficiencyVSAvoidheat accumulation in housing

Core Design Contradiction:

Loss of energyVSObject-affected harmful factors

Solution Approach 1:

The heat dissipation sheet acts as an intermediary component that bridges the image display unit and the external environment. It conducts heat from the display unit through the housing opening to the outside, serving as a thermal pathway that prevents heat accumulation within the housing while maintaining efficient heat dissipation.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 dissipates heat from the display elements, reducing the risk of temperature-related performance issues and extending the operational life of the wearable display device while maintaining a stylish and compact form.

Implementation Method 1

a heat dissipation sheet configured to conduct heat from the display element to the outer packaging case

Methodology Applied

Scientific EffectHeat conduction: Conduction (thermal)

Implementation Method 2

the heat dissipation sheet extends outward through an opening provided in the outer packaging case, and is stuck at a side surface of the outer packaging case

Methodology Applied

Scientific EffectHeat dissipation: Convection

Data Source

PatentUS11397328B2Wearable display device

Publication Date: 2022.07.26 SEIKO EPSON CORP

AI summary

A wearable display device includes a display element, an outer packaging case configured to house the display element, and a heat dissipation sheet configured to conduct heat from the display element to the outer packaging case, and the heat dissipation sheet extends outward through an opening provided in the outer packaging case, and is stuck at a side surface of the outer packaging case.