PLANAR ILLUMINATION DEVICE

摘要

[PROBLEMS] A planar illumination device using an LED is further increased and uniformized in brightness and is further thinned. [MEANS FOR SOLVING PROBLEMS] An LED (24) of a planar illumination device has no lamp house, and in the planar illumination device, a translucent resin (26) for sealing an LED chip (25) is exposed. As a consequence, the thickness of the planar illumination device is smaller by the amount of the thickness of the lamp house. In addition, because the outer shape of the translucent resin satisfies 0.3 = H/R = 0.6, a ratio of the amount of forwardly emitted light of the LED that contribute to higher brightness of the planar illumination device and a half bandwidth of the LED that contributes to brightness uniformization of the planar illumination device can be balanced at a high level. Further, because the radius R of a projection (28) of the LED (24) is formed to satisfy 1.5X = R, the LED chip (25) is completely sealed in the translucent resin (26) without being exposed from the translucent resin (26).