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《Journal of Applied Acoustics》 2019-06
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The mathematical-physical model of electro-magnetic actuator screen sound system

GENG Li;QU Sheng;School of Electrical and Energy Engineering, Nantong Institute of Technology;Nokia Shanghai Bell Company Ltd.;  
Full screen or full display mobile phone has become a trend. In order to improve user experience effect, the industry has developed some specific technologies, such as fingerprint recognition under screen,telescopic camera etc. For audio(mainly voice calls), two kinds of screen voice schemes based on piezoelectric(PZT) and electro-magnetic actuator(EMA) have been developed. The representative products are MI MIX and VIVO NEX respectively. This paper, aiming at EMA screen sound technology, deduces the EMA screen sound principle and simplified mechanical-electrical analog equivalent circuit from flat-panel bending vibration,flat-panel sound radiation, EMA array-driven and other models. Then the application of frequency response(FR) simulation in EMA screen vocalization and the actual measurement data of a certain mobile phone are introduced. Finally, this paper concludes the design guidelines of the EMA screen sound and the further research direction.
【CateGory Index】: TN643
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