| 摘要 |
PROBLEM TO BE SOLVED: To provide a flat light source device having unprecedentedly improved brightness, capable of prolonging life. SOLUTION: The flat light source 100 comprises an upper part base plate 150 and a lower part base plate 110 arranged so as to form a discharging space 152, a reflection layer 120 and a lower part fluorescent layer 130 laminated on upper face of the lower part base plate 110, and an upper part fluorescent layer 180 laminated on a lower face of the upper part base plate 150. The reflection layer 120 has a thickness of 40 to 120μm, the lower part fluorescent layer 130 has a thickness of 10 to 60μm, and the upper part fluorescent layer has a thickness of 10 to 25μm. Further, the flat light source comprises a first ion blocking layer 180 laminated between the upper part base plate 150 and the upper part fluorescent layer 180, by the above, elution of Na<SP>+</SP>ion from the upper part base plate is blocked. COPYRIGHT: (C)2007,JPO&INPIT
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