| 摘要 |
The light L emitted from the light emitting diode 4 refracts while passing through the prism sheet 5 and its directivity is modified, whereby the illuminating area is extended further. As a result, the emitting distribution pattern A of the light covers approximately all over the transparent substrate 2. The light thus having entered the transparent substrate 2 is refracted by the groove 2a, and the liquid crystal element contacting with the lower surface of the transparent substrate 2 is illuminated uniformly.
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