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
Slide 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-conductors processing Privately
held, backed by solid investors and industry veterans About Maradin
3
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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
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Markets and Applications 5 Gesture Sensing Pico Projectors
Eyewear DisplaysLarge Displays Automotive HUD Medical Industrial
More to emerge
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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
Projection System Sketch 8 Mirror position Spherical (3D)
Projected Surface Planar (2D) image
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Projection 3D Surface and Projections 9 Side View X-Z Plane
Front View X-Y Plane Optical Distortions
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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
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Solution Method Laser Modulation 11 70% (T/2) Avoid
edge-effects only 70% of the mirrors period is used for
projection
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Algorithm Eliminate Distortions 12 Eliminate geometrical
(Pincushion, Barrel) distortions by defining a different initial
projection time for each row
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)
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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
