| 摘要 |
A back light module comprising: a back light source; a guiding plate; and a PBS and an optical converter which are disposed between the back light source and the guiding plate. The PBS is adapted to split light emitted from the back light source into first polarized light and second polarized light with polarization directions perpendicular to each other, and the optical converter is adapted to convert the polarization direction of the second polarized light to be in the polarization direction of the first polarized light, and reflect the first polarized light or the converted second polarized light into the guiding plate. A liquid crystal display is also provided.
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