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26 May 2011 Speckle reduction technique for laser based automotive Head Up Display (HUD) projectors
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Recently various HUD (Head Up Display) projection engines have been introduced to industry, suited to solve the stringent price/size/functionality constrains the automotive market. Some of the most promising projectors are laser based and project directly a far-field image superimposed onto the driver's field of view by the mean of an optical combiner. One of the major drawbacks of such technology is the parasitic speckle produced by the coherent nature of the illumination (laser light), which has been proven to be very annoying and distracting for the driver. We propose a method to overcome the parasitic speckle phenomenon in the HUD application, not by reducing it directly but rather by uniformizing the speckle within the integration time of the eye, through generation of an orthogonal set of speckle modes for a single projected image.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Bernard Kress and Vic Hejmadi "Speckle reduction technique for laser based automotive Head Up Display (HUD) projectors", Proc. SPIE 8026, Photonic Applications for Aerospace, Transportation, and Harsh Environment II, 80260P (26 May 2011);

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