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Open AccessArticle

Optimization of MOEMS Projection Module Performance with Enhanced Piezoresistive Sensitivity

1
School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei 230026, China
2
Key Lab of Nanodevices and Applications, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215123, China
*
Author to whom correspondence should be addressed.
Micromachines 2020, 11(7), 651; https://doi.org/10.3390/mi11070651
Received: 20 May 2020 / Revised: 25 June 2020 / Accepted: 28 June 2020 / Published: 30 June 2020
(This article belongs to the Special Issue Optical MEMS, Volume II)
In scanning laser projection systems, the laser modulation time is important for the projection resolution. The modulation time needs to be matched with the motion of the micromirror. For this paper, the piezoresistive sensor was integrated on the torsion beam of the micromirror to monitor the physical position of the micromirror. The feedback signal was used to generate the zero-crossing time, which was used to estimate the physical position of the resonating mirror over time. The estimated position was affected by the zero-crossing time and the error directly influenced the definition of the projected image. By reducing the impurity concentration from 3 × 1018/cm3 to 1 × 1018/cm3 and increasing shear stress on piezoresistive sensor, the sensitivity of the piezoresistive sensor increased from 4.4 mV/V° to 6.4 mV/V° and the error of the image pixel reduced from 1.5 pixels to 0.5 pixels. We demonstrated that the image quality of an Optical-Microeletromechanical Systems (MOEMS) laser projection could be improved by enhancing the sensitivity of the piezoresistive sensor.
Keywords: MOEMS micromirror; sensitivity of piezoresistive sensor; zero-crossing time; position estimation; error of the image pixel MOEMS micromirror; sensitivity of piezoresistive sensor; zero-crossing time; position estimation; error of the image pixel
MDPI and ACS Style

Yu, H.; Zhou, P.; Wang, K.; Huang, Y.; Shen, W. Optimization of MOEMS Projection Module Performance with Enhanced Piezoresistive Sensitivity. Micromachines 2020, 11, 651.

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