| http://www.w3.org/ns/prov#value | - Therefore, there is a problem in that it is difficult to check visually from outside, after the assembly of the backlight device, whether the optical sheets 5 a and 5 b are appropriately incorporated. [0012] Here, if an ambient temperature of the liquid crystal display device is raised in an environmental test etc., the optical sheets 5 a and 5 b will expand thermally.
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