| 摘要 |
A planar surface illuminator ( 20 ) for installation below a liquid crystal display panel includes a light guide plate ( 22 ) and a plurality of light emitting diodes ( 21 ). The light guide plate has a bottom surface ( 223 ), an end surface ( 221 ) and a number of dots ( 23 ) formed on the bottom surface. The light emitting diodes are positioned adjacent the end surface to irradiate the light guide plate. Shortfall areas ( 223 a) in the light guide plate between each two adjacent light emitting diodes are lightened by placing special dots ( 23 a) therein, which special dots are made of melamine-based fluorescent particles. The melamine-based fluorescent particles function as small light sources, thus lightening the shortfall areas. The brightness of the planar surface illuminator is thereby balanced.
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