Speckle reduction technique for laser based automotive Head Up Display (HUD) projectors

Bernard Kress; Vic Hejmadi

doi:10.1117/12.886536

26 May 2011 Speckle reduction technique for laser based automotive Head Up Display (HUD) projectors

Bernard Kress, Vic Hejmadi

Proceedings Volume 8026, Photonic Applications for Aerospace, Transportation, and Harsh Environment II; 80260P (2011) https://doi.org/10.1117/12.886536
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.886536

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