Light diffusion sheet and backlight unit using the same

Details Light diffusion sheet and backlight unit using the same Light diffusion sheet and backlight unit using the same

2006-07-04

2006-07-04

Robinson, Mark A. (Department: 2872)

Optical: systems and elements

Diffusing of incident light

C362S355000, C349S112000

Reexamination Certificate

active

07072115

ABSTRACT:
Objects of the present invention is to provide light diffusion sheets capable of exhibiting improved heat resistance, thermal dimensional stability and weather resistance while maintaining transparency, which hardly give rise to bending, yellowing and the like even though they receive generated heat from a lamp and ultraviolet ray irradiation, and to provide backlight units in which reduction of the occurrence of lack in uniformity of the brightness are achieved using the light diffusion sheet.The light diffusion sheet according to the present invention comprises a transparent substrate sheet and a light diffusion layer overlaid to the front face side of the substrate sheet, wherein this light diffusion layer includes a light diffusing agent in a binder, with this binder being formed from a polymer composition comprising polyol and a fine inorganic filler, and having a glass transition temperature of 50° C. or greater and 80° C. or less, and with this fine inorganic filler having a mean particle diameter of 5 nm or greater and 50 nm or less.

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