Displaying three-dimensional objects

A system comprising:

• a display;
• and
• an optical device arranged adjacent to the display and configured to direct different colors of light towards the display while suppressing crosstalk between the different colors of light, wherein the optical device comprises:
• a first optically diffractive component comprising a first diffractive structure configured to diffract a first color of light having a first incident angle at a first diffracted angle towards the display;
• a second optically diffractive component comprising a second diffractive structure configured to diffract a second color of light having a second incident angle at a second diffracted angle towards the display, wherein the first diffractive structure is configured to transmit the second color of light, and the second diffractive structure is configured to transmit the diffracted first color of light towards the display;
• a first reflective layer configured to totally reflect non-diffracted first color of light having the first incident angle, transmit the diffracted first color of light, and transmit the second color of light;
• and
• a second reflective layer configured to totally reflect non-diffracted second color of light, transmit the diffracted first color of light, and transmit the diffracted second color of light towards the display,
• wherein the first reflective layer is between the first and second diffractive structures, and the second diffractive structure is between the first and second reflective layers,
• wherein at least one of the first diffractive structure or the second diffractive structure comprises a reflective Bragg grating configured to transmit non-diffracted light of one of the first color of light and the second color of light, wherein the transmitted non-diffracted light is being totally reflected by a corresponding reflective layer of the first reflective layer and the second reflective layer onto the reflective Bragg grating and being diffracted along a same direction as diffracted light of another one of the first color of light and the second color of light by another one of the first diffractive structure and the second diffractive structure, and
• wherein a first wavelength of the first color of light is less than a second wavelength of the second color of light, and the second incident angle is less than the first incident angle.

A method comprising:

• transmitting at least one timing control signal to an illuminator to activate the illuminator to emit a plurality of different colors of light onto an optical device, such that the optical device converts the plurality of different colors of light to individually diffracted colors of light to illuminate a display comprising a plurality of display elements;
• and
• transmitting, for each of the plurality of display elements of the display, at least one respective control signal to modulate the display element, such that the individually diffracted colors of light are reflected by the modulated display elements to form a multi-color three-dimensional light field corresponding to the respective control signals,
• wherein the optical device comprises:
• a first optically diffractive component comprising a first diffractive structure configured to diffract a first color of light having a first incident angle at a first diffracted angle towards the display;
• a second optically diffractive component comprising a second diffractive structure configured to diffract a second color of light having a second incident angle at a second diffracted angle towards the display;
• a first reflective layer configured to totally reflect non-diffracted first color of light having the first incident angle and transmit the second color of light;
• and
• a second reflective layer configured to totally reflect non-diffracted second color of light,
• wherein the first reflective layer is between the first and second diffractive structures, and the second diffractive structure is between the first and second reflective layers,
• wherein the first diffractive structure is configured to transmit the second color of light, and the second diffractive structure is configured to transmit the diffracted first color of light towards the display,
• wherein at least one of the first diffractive structure or the second diffractive structure comprises a reflective Bragg grating configured to transmit non-diffracted light of one of the first color of light and the second color of light, wherein the transmitted non-diffracted light is being totally reflected by a corresponding reflective layer of the first reflective layer and the second reflective layer onto the reflective Bragg grating and being diffracted along a same direction as diffracted light of another one of the first color of light and the second color of light by another one of the first diffractive structure and the second diffractive structure, and
• wherein a first wavelength of the first color of light is less than a second wavelength of the second color of light, and the second incident angle is less than the first incident angle.