Light redirecting element comprising a forward diffracting region and a scattering region
First Claim
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1. An optical element comprising:
- a) an input surface;
b) an output surface;
c) a light transmissive diffractive region;
d) a light scattering region optically coupled to the light transmissive diffractive region and disposed between the light transmissive diffractive region and the output surface;
wherein a portion of incident light with a wavelength, λ
, incident at an angle θ
1 is diffracted forward by the light transmissive diffractive region and subsequently diffused by the light scattering region such that a ratio of angular diffusion of the light scattering region to angular chromatic dispersion of at least one light transmissive diffractive element is greater than 0.5.
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Abstract
Improved Light Re-directing Elements (ILRE) are provided in which a diffracting region is combined with a light scattering region to correct angular chromatic dispersion. Further embodiments include optical devices and systems using ILRE to reduce moiré, efficiently re-direct light, improve spatial and angular color and luminance uniformity, and reduce wavelength dispersion. In one embodiment, the light scattering region is a volumetric anisotropic light scattering region. Embodiments are included for use of ILRE in light emitting devices, displays and light fixtures.
142 Citations
12 Claims
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1. An optical element comprising:
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a) an input surface; b) an output surface; c) a light transmissive diffractive region; d) a light scattering region optically coupled to the light transmissive diffractive region and disposed between the light transmissive diffractive region and the output surface; wherein a portion of incident light with a wavelength, λ
, incident at an angle θ
1 is diffracted forward by the light transmissive diffractive region and subsequently diffused by the light scattering region such that a ratio of angular diffusion of the light scattering region to angular chromatic dispersion of at least one light transmissive diffractive element is greater than 0.5. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification