| 摘要 |
An optical device for collecting light and selectively outputting or concentrating the light. A layer has an optical index of referaction n<SUB>1</SUB>, and top, bottom and side surfaces defining an angel of inclination phi. A back surface spans the top, bottom and side surface. A first layer is coupled to the bottom surface of the layer and has an index of refraction n<SUB>2</SUB>. The first layer index n<SUB>2 </SUB>causes light input through the back surface of the layer to be preferentially output into the first layer. A second layer is coupled to the bottom of the first layer and selectively causes output of light into ambient. Additional layers, such as alight polarization layer, a polarization converting layer and a post LCD diffuser layer can be used to make preferential use of polarized light of diffuse light having passed through the LCD layer to enhance viewing of the output light.
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