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Analysis of image quality for laser display scanner test
|Kullberg, R.C. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:|
Reliability, packaging, testing, and characterization of MEMS/MOEMS and Nanodevices VIII. Proceedings : 28 - 29 January 2009, San Jose, California, United States
Bellingham, WA: SPIE, 2009 (SPIE Proceedings 7206)
|Reliability, Packaging, Testing, and Characterization of MEMS/MOEMS and Nanodevices Conference <8, 2009, San Jose/Calif.>|
Photonics West Conference <2009, San Jose/Calif.>
|Fraunhofer ENAS ()|
The scanning laser display technology is one of the most promising technologies for highly integrated projection display applications (e. g. in PDAs, mobile phones or head mounted displays) due to its advantages regarding image quality, miniaturization level and low cost potential. As a couple of research teams found during their investigations on laser scanning projections systems, the image quality of such systems is - beside from laser source and video signal processing - crucially determined by the scan engine, including MEMS scanner, driving electronics, scanning regime and synchronization. Even though a number of technical parameters can be measured with high accuracy, the test procedure is challenging because the influence of these parameters on image quality is often insufficiently understood. Thus, in many cases it is not clear how to define limiting values for characteristic parameters. In this paper the relationship between parameters characterizing the scan engineand their influence on image quality will be discussed. Those include scanner topography, geometry of the path of light as well as trajectory parameters. Understanding this enables a new methodology for testing and characterization of the scan engine, based on evaluation of one or a series of projected test images. Due to the fact that the evaluation process can be easily automated by digital image processing this methodology has the potential to become integrated into the production process of laser displays.