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The invention provides an optical device, including a light-transmitting substrate, optical means for coupling light into the substrate by total internal reflection, and a plurality of partially reflecting surfaces carried by the substrate, characterized in that the partially reflecting surfaces are

The invention provides an optical device, including a light-transmitting substrate, optical means for coupling light into the substrate by total internal reflection, and a plurality of partially reflecting surfaces carried by the substrate, characterized in that the partially reflecting surfaces are parallel to each other and are not parallel to any of the edges of the substrate.

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1. An optical device, comprising:a light transmitting substrate having at least two major surfaces and edges; optical means for coupling light into said substrate by total internal reflection, anda plurality of partially reflecting surfaces located in said substrate, characterized in that said parti

1. An optical device, comprising:a light transmitting substrate having at least two major surfaces and edges; optical means for coupling light into said substrate by total internal reflection, anda plurality of partially reflecting surfaces located in said substrate, characterized in that said partially reflecting surfaces are parallel to each other. 2. The optical device according to claim 1, wherein said optical means is a wave-reflecting surface located in said substrate. 3. The optical device according to claim 1, wherein said plurality of partially reflecting surfaces couples the light trapped by total internal reflection out of said substrate. 4. The optical device according to claim 1, further comprising means for producing output waves from input waves, wherein said input waves and output waves are located on the same side of said substrate. 5. The optical device according to claim 1, further comprising means for producing output waves from input waves, wherein said input waves are located on one side of said substrate and said output waves are located on another side of said substrate. 6. The optical device according to claim 1, further comprising means for producing output waves from input waves, wherein said input waves are coupled into said substrate through one of its edges. 7. The optical device according to claim 1, wherein the reflectance of said plurality of partially reflecting surfaces is determined to achieve a field of view having uniform brightness. 8. The optical device according to claim 1, wherein the reflectance of said plurality of partially reflecting surfaces is determined to achieve a field of view having predefined brightness. 9. The optical device according to claim 1, wherein the reflectance of each of said partially reflecting surfaces is non-uniform across the reflecting surfaces, to achieve a field of view having predefined brightness. 10. The optical device according to claim 1, wherein the distances between said partially reflecting surfaces are determined to achieve a field of view having predefined brightness. 11. The optical device according to claim 1, further comprising a second plurality of partially reflecting surfaces located in said substrate, said second plurality of partially reflecting surfaces being parallel to each other and not being parallel to said first plurality of partially reflecting surfaces. 12. The optical device according to claim 11, wherein said second plurality of partially reflecting surfaces changes the direction of propagation of the light coupled in said substrate by total internal reflection. 13. The optical device according to claim 11, wherein the reflectance of said second plurality of partially reflecting surfaces is determined to achieve a field of view having uniform brightness. 14. The optical device according to claim 11, wherein the reflectance of said second plurality of partially reflecting surfaces is determined to achieve a field of view having predefined brightness. 15. The optical device according to claim 1, wherein said substrate is partially transparent, for allowing see-through operation. 16. The optical device according to claim 1, further comprising an opaque surface disposed so as to block the entrance of light traversing the substrate, from an external scene. 17. The optical device according to claim 1, further comprising a variable transmittance surface disposed so as to attenuate the entrance of light traversing the substrate, for controlling the brightness of light passing through said device from an external scene. 18. The optical device according to claim 17, wherein the transmittance of said variable transmittance surface is automatically determined according to the brightness of light directed to traverse the substrate. 19. The optical device according to claim 2, wherein said plurality of partially reflecting surfaces reflects trapped waves into a direction calculated to reach one eye of an observer. 20. The optical device ac cording to claim 2, wherein said plurality of partially reflecting surfaces reflects trapped waves into a direction calculated to reach both eyes of an observer. 21. The optical device according to claim 20, wherein each of said observer's eyes sees only part of the total field of view. 22. The optical device according to claim 1, wherein said device combines two different reproductions of the output at two different focal depths. 23. The optical device according to claim 1, wherein said device combines at least two different aspects of the external scene. 24. The optical device according to claim 1, wherein said plurality of partially reflecting surfaces is located in said substrate in such a way that at least one of the lateral dimensions of the light emerging from said substrate is larger than the light entering said substrate. 25. The device according to claim 24, wherein the reflectivities of said two pluralities of partially reflecting surfaces are set to achieve output waves having a uniform intensity. 26. The device according to claim 24, wherein the reflectivities of said two pluralities of partially reflecting surfaces are set to achieve output waves having a predefined intensity. 27. The optical device according to claim 1, further comprising a virtual retinal display source. 28. The optical device according to claim 1, further comprising an electronic display source, operating in such a way that the Fourier transform of the desired image is created in the plane of said display source. 29. The optical device according to claim 1, further comprising an array of light-emitting diodes constituting a light source. 30. The optical device according to claim 29, wherein said light source is coupled into the substrate through its edge. 31. The optical device according to claim 1, wherein said substrate is composed of a plurality of prisms. 32. The optical device according to claim 1, wherein said substrate is composed of a plurality of transparent forms created by injection molding techniques. 33. The optical device according to claim 1, wherein said substrate is composed of a plurality of parallel plates. 34. The optical device according to claim 1, wherein said partially reflecting surfaces are composed of flexible sheets coated with optical coatings. 35. The optical device according to claim 1, further comprising air gaps between at least two of said partially reflecting surfaces. 36. The optical device according to claim 1, wherein optical coatings are applied to at least portions of one or more of the said surfaces or edges of the substrate to form partially reflective surfaces. 37. The optical device according to claim 1, further comprising at least one half-wavelength plate inserted into the optical path of said device. 38. The optical device according to claim 1, wherein the reflectance of said plurality of partially reflecting surfaces is effected by Fresnel reflections. 39. The optical device according to claim 1, further comprising an array of at least two reflective surfaces located outside of said light-transmitting substrate. 40. The optical device according to claim 1, further comprising several different substrates combined together to form an optical system. 41. The optical device according to claim 1, wherein said device is mounted in an eyeglass frame. 42. The optical device according to claim 1, wherein said device is located in a mobile communication device. 43. The optical device according to claim 1, wherein said partially reflecting surfaces are non-parallel to said major surfaces of the substrate. 44. The optical device according to claim 1, wherein said major surfaces of the light transmitting substrate are parallel to each other. 45. The optical device as claimed in claim 1 further comprising a spatial pattern source and suitable collimating means. 46. The optical device as claimed in claim 1 further comprising a dynamic image source and suitable collimating means.