Holographic image projection with holographic correction
First Claim
1. A method of projection comprising:
- combining Fourier domain data representative of a 2D image with Fourier domain data having a first lensing effect to produce first holographic data;
spatially modulating light with the first holographic data to form a first spatially modulated light beam;
reflecting the first spatially modulated light beam using an optical combiner by illuminating a first region of the optical combiner with the first spatially modulated beam, the optical combiner having a spatially variant optical power, the first region of the optical combiner having an optical power resulting from a curvature of the first region of the optical combiner, the optical combiner reflecting the first spatially modulated light beam to a first region of a viewing plane,wherein the first lensing effect compensates at the first region of the viewing plane for the first optical power of the optical combiner in the first region; and
thenselecting, in real-time, different Fourier domain data having a different lensing effect to the first lensing effect to compensate for the optical power of the optical combiner in a different first region of the optical combiner, the different first region of the optical combiner having an optical power different from the optical power of the first region;
combining the Fourier domain data representative of the 2D image with the different Fourier domain data to produce different first holographic data;
spatially modulating light with the different first holographic data to form a different first spatially modulated light beam; and
reflecting the different first spatially modulated light beam using the optical combiner by illuminating a different first region of the optical combiner with the first spatially modulated beam.
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Accused Products
Abstract
There is provided a method of projection using an optical element (502,602) having spatially variant optical power. The method comprises combining Fourier domain data representative of a 2D image with Fourier domain data having a first lensing effect (604a) to produce first holographic data. Light is spatially modulated (504,603a) with the first holographic data to form a first spatially modulated light beam. The first spatially modulated light beam is redirected using the optical element (502,602) by illuminating a first region (607) of the optical element (602) with the first spatially modulated beam. The first lensing effect (604a) compensates for the optical power of the optical element in the first region (607). Advantageous embodiments relate to a head-up display for a vehicle using the vehicle windscreen (502,602) as an optical element to redirect light to the viewer (505,609).
50 Citations
21 Claims
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1. A method of projection comprising:
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combining Fourier domain data representative of a 2D image with Fourier domain data having a first lensing effect to produce first holographic data; spatially modulating light with the first holographic data to form a first spatially modulated light beam; reflecting the first spatially modulated light beam using an optical combiner by illuminating a first region of the optical combiner with the first spatially modulated beam, the optical combiner having a spatially variant optical power, the first region of the optical combiner having an optical power resulting from a curvature of the first region of the optical combiner, the optical combiner reflecting the first spatially modulated light beam to a first region of a viewing plane, wherein the first lensing effect compensates at the first region of the viewing plane for the first optical power of the optical combiner in the first region; and
thenselecting, in real-time, different Fourier domain data having a different lensing effect to the first lensing effect to compensate for the optical power of the optical combiner in a different first region of the optical combiner, the different first region of the optical combiner having an optical power different from the optical power of the first region; combining the Fourier domain data representative of the 2D image with the different Fourier domain data to produce different first holographic data; spatially modulating light with the different first holographic data to form a different first spatially modulated light beam; and reflecting the different first spatially modulated light beam using the optical combiner by illuminating a different first region of the optical combiner with the first spatially modulated beam. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A projector comprising:
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a computer processor arranged to combine Fourier domain data representative of a 2D image with Fourier domain data having a first lensing effect to produce first holographic data, to select in real-time, different Fourier domain data having a different lensing effect to the first lensing effect, and to combine the Fourier domain data representative of the 2D image with Fourier domain data having the different lensing effect from the first lensing effect to produce different first holographic data; at least one spatial light modulator comprising a first array of pixels arranged to represent the first holographic data, the first array of pixels of the spatial light modulator being configured to spatially modulate light with the first holographic data to provide a first spatially modulated light beam, and to spatially modulate light with the different first holographic data to provide a different first spatially modulated light beam; an optical combiner having spatially variant optical power, wherein the optical combiner comprises a first region having an optical power resulting from a curvature of the first region of the optical combiner and a different first region having an optical power different from the optical power of the first region, the optical combiner being configured to be illuminated by the first spatially modulated light beam in the first region thereof and reflect the first spatially modulated light beam to a first region of a viewing plane and to be illuminated by the different first spatially modulated light beam in the different first region thereof and reflect the different first spatially modulated light beam; wherein the first lensing effect compensates at the first region of the viewing plane for the first optical power of the first region of the optical combiner, and the different lensing effect compensates for the optical power of the different first region of the optical combiner. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification