1. Sharon Hornstein, PhD Optical Engineering Conf. February 26 th, 2014 1

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 2

3.  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 About Maradin 3

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

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

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 6

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

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

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

10. X Y X direction Y direction Problem Definition 10  The mirror is resonating in a sinusoidal profile. Its non-constant velocity implies a non-uniform distribution of pixels along the lines.  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. Differences in mirror velocity create non-uniform brightness along the lines

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

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

13. Algorithm – Uniform Distribution of Pixels 13 2 3 1 4 Result: uniform distribution 1 2 34 5 6 7 8 9 101112 13 14 5 8 10 12 14 15 17 19 21

14. Results 14 “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. Maradin Ltd. P.O. Box 56 Yokneam Industrial Park, South Yokneam 20692, Israel Tel. +972 (4) 627 3653 | Fax. +972 (4) 959 0327 www.maradin.co.il 15