| CPC G02B 27/0172 (2013.01) [G02B 27/145 (2013.01)] | 11 Claims |
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1. A light-guide optical element (LOE) for simultaneous viewing, by an eye of a viewer located in an eye motion box, of a real scene and of a projected image introduced into the LOE, the LOE comprising:
a block of transparent material having a first major surface and a second major surface, parallel to the first major surface, so that light conveying a projected image introduced into the LOE propagates within the LOE by internal reflection at the first and second major surfaces; and
a plurality of mutually-parallel partially reflecting surfaces internal to the block and obliquely oriented relative to the first major surface, the partially reflecting surfaces being configured so as to couple-out a part of the light conveying the projected image through the second major surface toward the eye motion box, wherein each of the partially reflecting surfaces has an optical coating defining the reflectance of the partially reflecting surface, and the reflectance of each of the partially reflecting surfaces is such that the total power of the light that is coupled out is less than one third of the total power of the light conveying the projected image that is introduced into the LOE, wherein the reflectance of the partially reflecting surfaces for light that is p-polarized with respect to the partially reflecting surfaces is reduced by a factor of at least four relative to the reflectance of the partially reflecting surfaces for light that is s-polarized with respect to the partially reflecting surfaces, and wherein the light conveying the projected image that is introduced into the LOE is polarized such that, when the light conveying the projected image reaches the partially reflecting surfaces, the light conveying the projected image is s-polarized with respect to the partially reflecting surfaces.
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