Slanted optical device

A system for generating and transmitting an image, comprising:

• an image generating system for generating collimated light constituting the image and being characterized by a principal direction of propagation;
• and
• an optical device having a planar substrate formed with:
• an input optical element for receiving and redirecting said collimated light for propagation of said light within said substrate, and a left and a right output optical elements for receiving light propagating within said substrate and coupling said light out of said substrate;
• wherein said left output optical element is laterally displaced from said right output optical element, and wherein said substrate is slanted at an acute tilt angle with respect to said principal direction.

A method of viewing an image, comprising,

• placing in front of the eyes an optical device having a planar substrate having a lower edge and an upper edge and being formed with an input optical element for receiving and redirecting light for propagation of said light within said substrate, and a left and a right output optical element for receiving light propagating within said substrate and coupling said light out of said substrate;
• and
• transmitting a light beam constituting the image to said input optical element, thereby viewing the image;
• wherein said placing is such that:
• said substrate and is slanted with respect to an eye plane engaged by the eyes and the distance between said substrate and said eye plane is shorter at said lower edge than at said upper edge;
• said left and said right output optical elements respectively provide said light to the left eye and the right eye.

A method of designing an optical relay device having a planar substrate formed with an input optical element and a left and a right output optical elements, the method comprising:

• (a) inputting a tilt angle of said substrate with respect to a principal direction, an angular field of view, eye box dimensions and an eye relief distance;
• (b) calculating dimensions and relative positions of said optical elements based on said input;
• (c) calculating a calculated eye relief distance;
• and
• (d) iteratively repeating (b)-(c) based on a comparison between said calculated eye relief distance and said inputted eye relief distance.