Miniaturized optical module for projection of arbitrary images based on two-dimensional resonant micro scanning mirrors

Scholles, M.; Bräuer, Andreas; Frommhagen, K.; Gerwig, Christian; Hoefer, Bernd; Jung, E.; Lakner, Hubert; Schenk, Harald; Schneider, Barbara; Schreiber, Peter; Wolter, Alexander

doi:10.1117/12.616779

Cited by 11 publications

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“…In general, lasers with increased optical power are needed to achieve bright images even under unfavorable conditions. This requires the replacement of the aluminum on top of the mirror by dielectric coatings with reflecting coefficients near to 100% [14]. Last but not least, miniaturized solutions for speckle reduction have to be integrated into the projection systems.…”

Section: Discussionmentioning

confidence: 99%

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Design of miniaturized optoelectronic systems using resonant microscanning mirrors for projection of full-color images

et al. 2006

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Projection systems comprising micromechanical scanning mirrors are a promising approach for information display of any kind. If combined with advanced laser diodes as light sources, ultra-compact projection heads can be realized, as it will be shown in this contribution. Besides the laser, key component of the system is a special MEMS device, a two-dimensional resonant micro scanning mirror. The laser beam formed by collimator optics is directed onto the micro scanning mirror. Then, the reflected beam describes a highly complicated Lissajous figure on the projection screen with flare angles of up to 20 degrees. By driving the mirror and electrically modulating the intensity of the laser beam in a synchronous manner, projection of images can be achieved. Advanced techniques that guarantee improved image quality and allow compensation of artifacts because of relative movement between projection head, screen, and human observer will be described. Based on these principles, several optoelectronic systems have been designed. A monochrome projection head that incorporates the laser diode, optics and the micro minor could be reduced to a volume of 15mm × 7 mm × 5mm. A slightly larger head is attached to a laser unit with red, green, and blue lasers via glass optical fiber for projection of full color images and video streams. All systems have VGA (640 × 480 pixels) resolution. They operate with 8 bit color depth per pixel and 50 frames per second. These key features in combination with the miniaturized size allow their use for a broad range of applications

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Section: Discussionmentioning

confidence: 99%

“…In the left part of Figure 7, the projection module used for full color images [14] is shown. It has a size of 23 x 23 x 27,5mm 3 and contains the micro scanning mirror (seen through the glass window) and some micro optics for collimation of the laser beam.…”

Section: System Realizationmentioning

confidence: 99%

Design of miniaturized optoelectronic systems using resonant microscanning mirrors for projection of full-color images

et al. 2006

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“…They either require complex optical (LCoS [5]) or mechanical (polygon wheels) systems, are bulky by nature (galvo scanners), or require driving voltages above 1000V for large deflection angles (other Micro scanners). A more detailed analysis can be found in [6]. In summary, the scanning mirror developed by Fraunhofer IPMS is an almost ideal choice for miniaturized projection systems.…”

Section: Basic Principles Of Image Display and System Architecturementioning

confidence: 99%

Ultra compact laser projection systems based on two-dimensional resonant micro scanning mirrors

Scholles

Bräuer

Frommhagen

et al. 2007

MOEMS and Miniaturized Systems VI

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Recently, there has been substantial progress in the development of ultra-compact image projection systems with dimensions clearly below the size of products based on DMDTM technology. This has been enabled by the availability of electrically modulated laser sources for all three elementary colors and a two-dimensional resonant micro scanning mirror as MOEMS device for light deflection. The laser beam formed by collimator optics is directed onto the micro scanning mirror. Then, the reflected beam describes a highly complicated Lissajous figure on the projection screen with flare angles of up to 20 degrees. By driving the mirror and electrically modulating the intensity of the laser beam in a synchronous manner, projection of images can be achieved. In this contribution we will present the theoretical background of the projection system as well as the latest achievements in system design. Both monochrome and full color systems are currently available. The latter use a separate laser bank as RGB light source, which is coupled with the projection head comprising the micro-optics and the micro scanning mirror. For monochrome red systems, the laser diode can be integrated into the projection head as well, whose volume could be reduced to 15mm x 7 mm x 5mm. All systems have VGA (640 x 480 pixels) resolution and operate with 8 bit color depth per pixel and 50 frames per second. This degree of miniaturization makes laser projection systems attractive for integration into mobile devices and overcomes limitations of display size in such appliances

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“…Micromirror-based laser scanning technology has drawn the attention of many researchers for a variety of applications, especially for display systems. The ability of a single MEMS micromirror to deflect a laser with a large angle at high frequency makes it possible to create displays with high brightness and resolution [ 1 , 2 , 3 , 4 ]. The benefit of the use of MEMS micromirrors is that they will greatly reduce the volume and power of a system.…”

Section: Introductionmentioning

confidence: 99%

Image Quality Analysis and Optical Performance Requirement for Micromirror-Based Lissajous Scanning Displays

Zhang

2016

Sensors

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Micromirror-based scanning displays have been the focus of a variety of applications. Lissajous scanning displays have advantages in terms of power consumption; however, the image quality is not good enough. The main reason for this is the varying size and the contrast ratio of pixels at different positions of the image. In this paper, the Lissajous scanning trajectory is analyzed and a new method based on the diamond pixel is introduced to Lissajous displays. The optical performance of micromirrors is discussed. A display system demonstrator is built, and tests of resolution and contrast ratio are conducted. The test results show that the new Lissajous scanning method can be used in displays by using diamond pixels and image quality remains stable at different positions.

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Miniaturized optical module for projection of arbitrary images based on two-dimensional resonant micro scanning mirrors

Cited by 11 publications

References 0 publications

Design of miniaturized optoelectronic systems using resonant microscanning mirrors for projection of full-color images

Design of miniaturized optoelectronic systems using resonant microscanning mirrors for projection of full-color images

Ultra compact laser projection systems based on two-dimensional resonant micro scanning mirrors

Image Quality Analysis and Optical Performance Requirement for Micromirror-Based Lissajous Scanning Displays

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