Improved vision by eye aberration correction using an active-matrix-addressed micromirror array

Andreas Gehner; Michael Wildenhain; Wolfgang Doleschal; Andreas Elgner; Harald Schenk; Hubert Lakner

doi:10.1117/12.472902

20 January 2003 Improved vision by eye aberration correction using an active-matrix-addressed micromirror array

Andreas Gehner, Michael Wildenhain, Wolfgang Doleschal, Andreas Elgner, Harald Schenk, Hubert Lakner

Proceedings Volume 4983, MOEMS and Miniaturized Systems III; (2003) https://doi.org/10.1117/12.472902
Event: Micromachining and Microfabrication, 2003, San Jose, CA, United States

Abstract

For the correction of the human eye´s higher order aberrations in vision science we developed a new micromirror device with an monolithically integrated active CMOS address matrix providing a fine segmented array of 240 × 200 mirror elements across an active area of 9.8 × 8.0 mm². The micromirrors possess a piston-type architecture for a pure phase shifting capability and are fabricated by means of aluminum surface-micromachining. Using a basic pixel size of 40 × 40 μm² a mechanical stroke of at least 450 nm is obtained at address voltages below 30V, which is suitable for both active matrix addressing and a modulo 2π phase correction in the visible. Furthermore, an active CMOS address matrix similar to a DRAM was developed providing one switching transistor and one storage capacitor for each mirror cell. Those devices were fabricated within a special high voltage CMOS process providing a full analog address capability of up to 30V at an 8 bit resolution defined by the external driving board. Using interferometric surface profile and laser vibrometer measurements we will present latest experimental results of the mirrors’ electromechanical properties. For the first time those micromirror devices now also have been implemented into an ophthalmic diagnosis system for the measurement and correction of the human eye’s wave aberrations. Therefore, first results of the obtained aberration reduction as well as the impact on vision enhancement will be presented.

Citation Download Citation

Andreas Gehner, Michael Wildenhain, Wolfgang Doleschal, Andreas Elgner, Harald Schenk, and Hubert Lakner "Improved vision by eye aberration correction using an active-matrix-addressed micromirror array", Proc. SPIE 4983, MOEMS and Miniaturized Systems III, (20 January 2003); https://doi.org/10.1117/12.472902

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