Near-eye device
There is provided a near-eye device for augmenting a real world view. The near-eye device comprises a spatial light modulator comprising an array of phase modulating elements arranged to apply a phase delay distribution to incident light. The device further comprises a beam combiner comprising a first optical input arranged to receive spatially modulated light from the spatial light modulator and a second optical input having a field of view of the real world.
1. A near-eye device comprising:
a spatial light modulator comprising an array of light modulating elements arranged to apply a modulation comprising a phase delay distribution to incident light;
a light source arranged to illuminate the spatial light modulator with the incident light;
a beam combiner configured to combine spatially modulated light from the spatial light modulator received at a first optical input thereof with a field of view of the real world received at a second optical input thereof; and
a processor configured to cause the spatial light modulator to modulate the incident light with phase data having a negative lensing effect and with holographic data representative of an image, wherein the lensing effect is such that the spatially modulated light received from the spatial light modulator by the beam combiner is diverging.
2. A near-eye device as claimed in claim 1 , wherein the holographic data is a Fourier hologram.
3. A near-eye device as claimed in claim 2 , configured such that that a user's eye performs a Fourier transform of the spatially modulated light such that the user sees a holographic reconstruction of the image.
4. A near-eye device as claimed in claim 1 , wherein the holographic data is a Fresnel hologram.
5. A near-eye device as claimed in claim 4 , wherein the spatially modulated light is arranged to form a holographic reconstruction of the image at a replay plane in the near-field.
6. A near-eye device as claimed in claim 1 , wherein the processor is further configured to cause the spatial light modulator to modulate the incident light with data arranged to compensate for aberrations in other optical components of the near-eye device.
7. A near-eye device as claimed in claim 1 , wherein the beam combiner further comprises an optical output arranged to combine the light received on the first optical input with light received on the second optical input.
8. A near-eye device as claimed claim 7 , wherein the optical output is arranged to at least partially overlay the light received on the first optical input with the light received on the second optical input.
9. A near-eye device as claimed claim 7 , arranged for a user of the near-eye device to receive the optical output from the beam combiner.
10. A near-eye device as claimed claim 1 , configured such that a holographic reconstruction of the image augments the field of view of the real world.
11. A near-eye device as claimed in claim 1 , wherein the light source is arranged to illuminate the spatial light modulator with a plane wave of light.
12. A near-eye device as claimed in claim 1 , wherein the near-eye device is a pair of goggles or glasses.
13. A system as claimed in claim 1 , wherein the spatial light modulator is displaying a phase delay distribution that modulates incident light with phase data having a lensing effect and with holographic data representative of an image, wherein the lensing effect is such that the spatially modulated light received from the spatial light modulator by the beam combiner is diverging.
14. A method of providing augmented reality using a near-eye device, the method comprising:
providing holographic data representative of an image and phase data having a lensing effect;
spatially modulating light with the holographic data representative of the image and the phase data having the lensing effect to form spatially-modulated light;
combining the spatially-modulated light with a field of view of the real world using a beam combiner; and
providing the combined spatially-modulated light to a user's eye,
wherein the lensing effect is negative such that the spatially modulated light received from the spatial light modulator by the beam combined is diverging.
15. A method of providing augmented reality as claimed in claim 14 , wherein the holographic data is a Fourier hologram.
16. A method of providing augmented reality as claimed in claim 14 , wherein the holographic data is a Fresnel hologram.
17. A method of providing augmented reality as claimed in claim 14 , further comprising:
providing data arranged to compensate for aberrations in optical components of the near-eye device; and
compensating for aberrations in the optical components of the near-eye device.
18. A method as claimed in claim 14 , configured such that that the user's eye performs a Fourier transform of the spatially modulated light such that the user sees a holographic reconstruction of the image.
19. A method as claimed in claim 14 , further comprising illuminating the spatial light modulator with a plane wave of light.
20. A method as claimed claim 14 , wherein the combining is performed to at least partially overlay the spatially-modulated light with the field of view of the real world.