Category : Cameras, image sensors, imaging systems, scanners, thermography, UV viewers > Imaging systems, image processing

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Projection devices based on laser scanning are a very interesting alternative to matrix displays. A modulated laser and a deflection unit are needed for the realization of laser scanning. Using micro scanning mirrors for implementing the laser beam deflection in a projection device has many advantages. In particular, micro scanning mirrors which operate resonantly in both directions, enable the development of systems with very small size and low power consumption. The presented demonstrator uses a laser module with a power of 3.5 mW and a 2D micro scanning mirror operated with deflection frequencies of 9.4 kHz and 1.4 kHz. The projection device does not use the usually implemented linear scanning. Instead, both axes perform a sinusoidal oscillation which causes a beam trajectory that describes a Lissajous pattern with high density. Therefore, mirrors with low ratio of horizontal and vertical deflection frequency can be used. This kind of micro scanning mirrors can be fabricated easily and cost effective.
The control circuit is developed with an FPGA and provides a resolution of 256 x 256 monochromatic pixels. Programmable counters are used for generating the mirror driving signals and for determining the beam position. Mirror excitation and image synchronization work without feedback loop. This means, no complicated optical or electronic synchronization techniques are needed. This simplifies micro scanning mirror and control circuit and enables low cost production. Applications of the projection device are low content displays, laser marking and laser exposure.

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List of all articles in this sub-category Imaging systems, image processing

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