| 摘要 |
PROBLEM TO BE SOLVED: To provide planar light source using a LED chip and a wavelength conversion substance which prolongs a life span and has high reliability by a method wherein the sheet-like wavelength conversion substance which has beforehand been formed at a predetermined thickness is arranged in the entire region on a light-emitting diode chip side of a sheet which is subjected to a diffusion process. SOLUTION: In a stand 1 provided with a reflection frame 2 forming a plurality of recess parts 3, a wiring for supplying a power to each LED chip 5 is provided, and the LED chip 5 is disposed in the recess parts 3 so as to be electrically connected to the wiring and then does not project outwardly from the interior of the recess parts 3. On these front faces, a wavelength conversion sheet and a diffusion plate about on the reflection frame 2 to be laminated so as to coat the recess part 3, and these are sealed with a mold resin 8 to obtain a planar light source 10. Thus, it is possible to reduce the thickness of a wavelength conversion substance, a difference between conversion efficiencies caused by non-uniformity of a distribution, and also a color unevenness thereby, and to obtain the planar light source 10 of a uniform light-emitting color. |
