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7 February 2007Tilt compensated MOEMS projector as input device
Silicon micro machining once headed into two directions: MEMS (micro electro mechanical systems) based sensors
like accelerometers and gyroscopes on the one hand, MOEMS (micro opto electro mechanical systems) based
actuators like scanner mirrors on the other hand. Now both directions meet again: A tilt compensated projector
module uses a two dimensional excited scanner mirror as well as accelerometers and gyroscopes.
The projector module can have a minimum size of 30 x 15 x 15 mm3 with a monochrome red laser source (λ = 635
nm). It reaches a resolution of 640 x 480 pixels (VGA) and a frame rate of 50fps. Colour projection requires lager
size due to the lack of compact green laser sources. The tilt and roll angles are measured statically by a three axes
accelerometer, fast movement is detected dynamically by three single axis gyroscopes. Thus tilt of the projection
systems was compensated successfully. The dynamic range was set to 300 x 300 pixels for sufficient system
dynamic.
Furthermore the motion detection was used to achieve control and input device functions. The first demonstration
and test system consists of a projector mounted at the axis of a PC racing wheel together with the additional inertial
measurement unit (IMU) system. It was shown that projection and input function work well together. Using this
approach, new possibilities for hand-held devices arise in the close future.
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Heinrich Grüger, Andreas Heberer, Christian Gerwig, Petra Nauber, Michael Scholles, Hubert Lakner, "Tilt compensated MOEMS projector as input device," Proc. SPIE 6489, Projection Displays XII, 64890D (7 February 2007); https://doi.org/10.1117/12.700183