1 / 15

Sharon Hornstein, PhD

MARADIN MEMS SCANNING MIRROR Applications and Synchronization Notes . Sharon Hornstein, PhD. Optical Engineering Conf. February 26 th , 2014. Outline. About Maradin MEMS Mirror - motion definition Problem definition:

hera
Download Presentation

Sharon Hornstein, PhD

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. MARADIN MEMS SCANNING MIRROR Applications and Synchronization Notes Sharon Hornstein, PhD Optical Engineering Conf. February 26th, 2014

  2. Outline • About Maradin • MEMS Mirror - motion definition • Problem definition: Why are image corrections needed when a scanning mirror is used for projection? • The algorithm for image correction, using laser modulation. • Summary

  3. About Maradin • Fabless MEMS company (Founded in 2007) • Develop innovative MEMS Scanning Mirror solutions for laser projection and laser scanning applications • Experienced and committed Team, in MEMS, Semiconductors, and System • Electronics, Mechanics, Dynamics, Control, Material Science, Semi-conductor’s processing • Privately held, backed by solid investors and industry veterans

  4. The Core of Laser Steering Systems Laser Diodes + Optics Maradin 2D MEMS Scanning Mirror Maradin Chipset Laser Driver Maradin Laser Timing Algorithm Maradin MEMS Drive & Control Video Data

  5. Markets and Applications Pico Projectors Automotive HUD Medical Eyewear Displays Large Displays More to emerge… Industrial Gesture Sensing

  6. 2D MEMS Mirror • Horizontal Axis: • Electro-static actuator built into Silicon • Operation at resonance (~10KHz) • Capacitive sensing and resonance lock control • Vertical Axis: • Hybrid Electro-magnetic actuator (“DC” motor) • Step function scanning • Modulated capacitance sensing and position control

  7. MEMS Mirror - motion definition • Horizontal Axis – Sinusoidal Motion (~10KHz]) • Vertical Axis – Saw Tooth Pattern (60Hz]) Reference signal Sensor measurement

  8. Projection – System Sketch Spherical (3D) Projected Surface Planar (2D) image Mirror position

  9. Projection – 3D Surface and Projections Front View X-Y Plane Side View X-Z Plane Optical Distortions

  10. Y Problem Definition X • The mirror is resonating in a sinusoidal profile. Its non-constant velocity implies a non-uniform distribution of pixels along the lines. Differences in mirror velocity create non-uniform brightness along the lines Y direction X direction • The scanning mirror creates a 3D surface. The image is created by intersection of light onto a 2D plane. • Pincushion distortion (e.g. bowed boundaries) due to geometry.

  11. Solution Method – Laser Modulation • Avoid edge-effects – only 70% of the mirror’s period is used for projection 70% (T/2)

  12. Algorithm – Eliminate Distortions • Eliminate geometrical (Pincushion, Barrel) distortionsby defining a different initial projection time for each row

  13. Algorithm – Uniform Distribution of Pixels 2 3 4 1 6 9 14 5 10 11 12 3 4 13 1 8 2 7 15 19 21 10 8 14 5 12 17 Result: uniform distribution

  14. Results • “Target Resolution“: • Linearly distributed pixels along the x axis • Vertical lines are one-pixel width • Fine Forward\backward alignment • Diagonal lines are sharp (not bowed)

  15. Thank you! Maradin Ltd. P.O. Box 56YokneamIndustrial Park, South Yokneam20692,Israel Tel. +972 (4) 627 3653 | Fax. +972 (4) 959 0327 www.maradin.co.il

More Related