Devices for data superimposition

1. An apparatus comprising:

a transparent carrier arranged for a user of the apparatus to look through;

a holographic layer disposed on the transparent carrier and sensitive to one or more certain wavelengths of light;

a spatial amplitude modulator configured to output modulated light by modulating a source light according to input image data, the source light being at one or more of the one or more certain wavelengths; and

a diffuser arranged to direct the modulated light onto the holographic layer, to thereby superimpose an image corresponding to the input image data onto a scene defined by a field of view of the user when looking through the transparent carrier;

wherein the apparatus comprises a pair of glasses and wherein the transparent carrier comprises at least one lens of the pair of glasses, wherein the lenses may or may not be corrective lenses; and

wherein the pair of glasses comprise left and right lenses having corresponding left and right side pieces for supporting the pair of glasses on a head of the user, and wherein the holographic layer is disposed on the front or rear surface of the left or right lens, the diffuser is disposed on an edge surface at a side of the same lens captured by the corresponding side piece, and the spatial amplitude modulator and a light source providing the source light are integrated with the corresponding side piece.

2. The apparatus of claim 1 , wherein the holographic layer is both angle-selective and wavelength-selective, such that the holographic layer is responsive only to light incoming at angles corresponding to a relative positioning of the diffuser and only to light at the one or more certain wavelengths of the source light, and is otherwise transparent from the perspective of the user.

3. The apparatus of claim 1 , wherein the holographic layer is disposed on a front or rear surface of the at least one lens, and wherein the diffuser is arranged on an edge surface of the at least one lens at a relative angle to the holographic layer and configured to redirect the modulated light according to the relative angle.

4. The apparatus of claim 3 , wherein the lenses are corrective lenses and wherein the front or rear surface on which the holographic layer is disposed is curved for optical correction.

5. The apparatus of claim 1 , wherein the at least one lens has a front surface facing the scene and a rear surface facing an eye of the user, when the user uses the pair of glasses to view the scene, and wherein the holographic layer is disposed on the front or rear surface of the at least one lens.

6. The apparatus as claimed in claim 1 , wherein the diffuser is a holographic diffuser.

7. The apparatus as claimed in claim 1 , wherein the diffuser has a dimension of less than 1.5 cm×1.5 cm.

8. The apparatus as claimed in claim 1 , wherein the holographic layer is sensitive to multiple wavelengths, for superimposition of polychromatic images.

9. The apparatus of claim 8 , wherein the holographic layer comprises multiple holographic layers, each layer sensitive to a respective one of the multiple wavelengths and transparent to other wavelengths.

10. An apparatus comprising:

a transparent carrier arranged for a user of the apparatus to look through;

a holographic layer disposed on the transparent carrier and sensitive to one or more certain wavelengths of light;

a spatial amplitude modulator configured to output modulated light by modulating a source light according to input image data, the source light being at one or more of the one or more certain wavelengths; and

a diffuser arranged to direct the modulated light onto the holographic layer, to thereby superimpose an image corresponding to the input image data onto a scene defined by a field of view of the user when looking through the transparent carrier;

wherein the input image data corresponds to first and second images to be superimposed by the holographic layer, wherein the modulated light comprises first modulated light at one or more certain frequencies and second modulated light at one or more other certain frequencies, the first and second modulated light corresponding to the first and second images, respectively, and wherein the holographic layer is configured with wavelength sensitivities such that it spatially positions the first image at a first position and the second image at a second position.

11. The apparatus as claimed in claim 10 , wherein the first modulated light contains a first group of wavelengths corresponding to first wavelength sensitivities of the holographic layer, and wherein the second modulated light contains a second group of wavelengths corresponding to second wavelength sensitivities of the holographic layer.

12. The apparatus as claimed in claim 10 , wherein the diffuser comprises a first diffuser at a first diffuser position and configured to direct the first modulated light onto the holographic layer, and a second diffuser at a second diffuser position and configured to direct the second modulated light onto the holographic layer.

13. An apparatus comprising:

a transparent carrier arranged for a user of the apparatus to look through;

a holographic layer disposed on the transparent carrier and sensitive to one or more certain wavelengths of light;

a spatial amplitude modulator configured to output modulated light by modulating a source light according to input image data, the source light being at one or more of the one or more certain wavelengths; and

a diffuser arranged to direct the modulated light onto the holographic layer, to thereby superimpose an image corresponding to the input image data onto a scene defined by a field of view of the user when looking through the transparent carrier;

wherein the transparent carrier is a lens or pane having a front surface facing the scene and a rear surface facing an eye of the user, when the user uses the lens or pane to view the scene, and wherein the holographic layer is disposed on the front or rear surface of the lens or pane; and

wherein the diffuser is a transmissive diffuser that transmissively redirects the modulated light onto the holographic layer and wherein the apparatus further includes an optical lens disposed between the spatial amplitude modulator and the transmissive diffuser, the optical lens arranged to focus the modulated light from the spatial amplitude modulator onto a light-receiving side of the transmissive diffuser.