| 摘要 |
A brightness enhancing means ( 5 ), comprising a collimating means ( 6 ) having a receiving area ( 61 ), an output area ( 62 ) being larger than said receiving area ( 61 ), and sidewalls ( 63 ) at least partially extending between said receiving and output areas, is provided. At least a portion of the sidewalls ( 63 ) of said collimating means ( 6 ) comprises a first filter being arranged to reflect light of a first light property, which light is received via said receiving area (61) of said first collimating means ( 6 ), towards said output area ( 62 ) of said first collimating means ( 6 ), wherein said first filter is a dichroic filter or a polarization filter.
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