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ILLUMINATION DEVICE

  • US 20150268399A1
  • Filed: 10/24/2013
  • Published: 09/24/2015
  • Est. Priority Date: 10/24/2012
  • Status: Active Grant
First Claim
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1. An illumination device for illuminating at least one spatial light modulator device being used preferably for displaying two-dimensional and/or three-dimensional images comprising:

  • at least one light source device with at least one light source illuminating the at least one spatial light modulator device;

    a preferably substantially planar light guiding element comprising at least one light conducting core, where the at least one light source device is arranged on a side of the light guiding element and where the light emanating from at least one light source of the at least one light source device propagates areally through the light guiding element;

    at least one light decoupling element arranged on top or inside of the light guiding element, the at least one light decoupling element is provided for decoupling of a wave field of the light which propagates in the light guiding element into the direction of the at least one spatial light modulator device;

    wherein;

    the light guiding element has a refractive index lower than or at least equal to the refractive index of the at least one light decoupling element, where the entrance angle of the wave field entering the at least one light decoupling element is determined by the difference between the said refractive indices in such a way that an angular spectrum of plane waves decoupled from the at least one light decoupling element has a predefined value which depends on the required use of the illumination device.

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