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; and
combining the Fourier domain data representative of the 2D image with Fourier domain data having a second lensing effect to produce second holographic data;
and, concurrently,providing a first spatially modulated light beam to a first region of a viewing plane by a method comprisingspatially modulating light with the first holographic data to form the first spatially modulated light beam;
redirecting 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 optical combiner redirecting the first spatially modulated light beam to the 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
providing a second spatially modulated light beam to a second region of a viewing plane, the second region of the viewing plane being different from the first region of the viewing plane, by a method comprisingspatially modulating light with the second holographic data to form the second spatially modulated light beam;
redirecting the second spatially modulated light beam using the optical combiner by illuminating a second region of the optical combiner with the second spatially modulated beam, the second region of the optical combiner being different from the first region of the optical combiner and having an optical power, the optical combiner redirecting the second spatially modulated light beam to the second region of the viewing plane;
wherein the second lensing effect compensates at the second region of the viewing plane for the optical power of the optical combiner in the second region.
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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).
45 Citations
22 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; and combining the Fourier domain data representative of the 2D image with Fourier domain data having a second lensing effect to produce second holographic data; and, concurrently, providing a first spatially modulated light beam to a first region of a viewing plane by a method comprising spatially modulating light with the first holographic data to form the first spatially modulated light beam; redirecting 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 optical combiner redirecting the first spatially modulated light beam to the 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 providing a second spatially modulated light beam to a second region of a viewing plane, the second region of the viewing plane being different from the first region of the viewing plane, by a method comprising spatially modulating light with the second holographic data to form the second spatially modulated light beam; redirecting the second spatially modulated light beam using the optical combiner by illuminating a second region of the optical combiner with the second spatially modulated beam, the second region of the optical combiner being different from the first region of the optical combiner and having an optical power, the optical combiner redirecting the second spatially modulated light beam to the second region of the viewing plane; wherein the second lensing effect compensates at the second region of the viewing plane for the optical power of the optical combiner in the second region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. 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, and to combine the Fourier domain data representative of the 2D image with Fourier domain data having a second lensing effect to produce second holographic data; one or more spatial light modulators, the one or more spatial light modulators together 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 a second array of pixels arranged to, concurrently with the representation of the first holographic data, represent the second holographic data, the second array of pixels of the spatial light modulator being configured to spatially modulate light to provide a second spatially modulated light beam; an optical combiner having spatially variant optical power, wherein the optical combiner comprises a first region having an optical power, the optical combiner being configured to be illuminated by the first spatially modulated light beam in the first region thereof and redirect the first spatially modulated light beam to a first region of a viewing plane, and a second region having a second optical power, the second region of the optical combiner being different than the first region of the optical combiner, the optical combiner being configured to be, concurrent with the illumination of the first region thereof, illuminated by the second spatially modulated light beam in the second region and to redirect the second spatially modulated light beam to a second region of the viewing plane different from the first region of the viewing plane; 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 second lensing effect compensates at the second region of the viewing plane for the optical power of the second region of the optical combiner. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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Specification