| 摘要 |
<p>[Problem] To provide a reflective film having high reflectivity without degrading a constituent member of an LED, and to provide a high-brightness lamp unit in which an LED light source exhibits minimal color change in a backlight device having the LED light source arranged on a side surface thereof. [Solution] A first embodiment is a white film having a hydrogen sulfide content of 20×10-12 mol/g or less, and/or a white film having a sulfur oxide content of 1.0×10-9 mol/g or less. A second embodiment provides a white film comprising barium sulfate particles, wherein the product of the barium sulfate content M (by weight fraction) in the white film and the amount N (in mol/g) of sulfide ions (S2-) included in the barium sulfate particles is M×N<=30×10-9 (mol/g), or alternatively provides a white film comprising barium sulfate particles, wherein the amount of sulfide ions (S2-) included in the white film is 30×10-9 (mol/g) or less. A third embodiment provides a lamp unit in which there is used a white film for which the amount of hydrogen sulfide discharged during a treatment performed for four hours at a temperature of 80°C under a relative humidity of 95% is 20×10-12 mol/g or less, and/or provides a lamp unit in which there is used a white film for which the amount of sulfur oxide discharged during a treatment performed for four hours at a temperature of 80°C under a relative humidity of 95% is 1.0×10-9 mol/g or less.</p> |
