| 摘要 |
PROBLEM TO BE SOLVED: To provide a lgihting system for a liquid crystal display element capable of optionally controlling the luminance distribution and/or spectral distribution on the light emitting surface of a back light, and displaying a full color image with uniform brightness, high contrast, and high chroma. SOLUTION: In a device, light from a light source is incident on a light transmitting body 1, a light flux from a plurality of openings of a mask 2 arranged on one surface of the light transmitting body 1 is incident in a hologram element having a plurality of unit holograms 4-i through an array-shaped light collecting element, the light flux is spectrally diffracted in a plurality of light fluxes having different wave length with the unit hologram, and collected in the desired position at a predetermined spatial cycle. The light source has a light emitting element group comprising a plurality of light emitting elements having the central wave length of light emission in the central wave length of a plurality of light fluxes produced by the spectral diffraction of the unit hologram 4-i. |
