Thermal Model and Countermeasures for Future Smart Glasses

Sensors
Kodai MatsuhashiAtsushi Kurokawa

Abstract

The market for wearable devices such as smart watches and smart glasses continues to grow rapidly. Smart glasses are attracting particular attention because they offer convenient features such as hands-free augmented reality (AR). Since smart glasses directly touch the face and head, the device with high temperature has a detrimental effect on human physical health. This paper presents a thermal network model in a steady state condition and thermal countermeasure methods for thermal management of future smart glasses. It is accomplished by disassembling the state by wearing smart glasses into some parts, creating the equivalent thermal resistance circuit for each part, approximating heat-generating components such as integrated circuits (ICs) to simple physical structures, setting power consumption to the heat sources, and providing heat transfer coefficients of natural convection in air. The average temperature difference between the thermal network model and a commercial thermal solver is 0.9 °C when the maximum temperature is 62 °C. Results of an experiment using the model show that the temperature of the part near the ear that directly touches the skin can be reduced by 51.4% by distributing heat sources into both sides, 11...Continue Reading

References

Sep 28, 2015·Technology and Health Care : Official Journal of the European Society for Engineering and Medicine·Stefan MitrasinovicE Sander Connolly
Jan 24, 2017·IEEE Transactions on Bio-medical Engineering·DaeHan AhnTaejoon Park

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