Back to results
US 6,480,249 B2Granted
Polarizing plate having a light diffusing layer
AssigneeDai Nippon Printing Co., Ltd.
InventorsYukimitsu Iwata, Fumihiro Arakawa
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeDai Nippon Printing Co., Ltd.
InventorsYukimitsu Iwata, Fumihiro Arakawa
Estimating the term…
A light diffusing film is produced by preparing a paint by adding a light transmissive diffusing material comprising resin beads to a light transmissive resin, and coating the paint on one or both of the surfaces of transparent film substrate made of TAC, to produce a light diffusing layer. In the light diffusing film, the haze value on the surface of light diffusing layer is three or more, the difference between the haze value along the normal and that the lines ±60° apart from the normal is four or less, and the surface is practically smooth whose roughness is so adjusted as to give a surface roughness Ra of Ra≦0.2 μm. Application of such a light diffusing film onto a display panel inhibits scattering reflection which would otherwise cause the display to be whitish, reduces the variation of haze values which vary depending on the viewed angle, and thus improves display quality.
A liquid crystal display apparatus comprising a liquid crystal panel, and a polarizing plate with a light diffusing film which is mounted on the display side of liquid crystal panel and including a transparent film substrate, a polarizing layer is laminated on one of the surfaces of the transparent film substrate, and the light diffusing film which has, on the other side of the surfaces of the transparent film substrate, a light diffusing layer laminated comprising a light transmissive resin containing a light transmissive diffusing material being different from the light transmissive resin in refractive index, the haze value on the surface of light diffusing layer is three or more, the difference between the haze value along the normal and that along the lines ±60° apart from the normal is four or less, and Ra representative of the surface roughness is 0.2 μm or less.
A liquid crystal display apparatus comprising a liquid crystal panel, and a polarizing plate with a light diffusing film which is mounted on the display side of liquid crystal panel and including a transparent film substrate, a polarizing layer is laminated on one of the surfaces of the transparent film substrate, and the light diffusing film which has, on the other side of the surfaces of the transparent film substrate, a light diffusing layer laminated comprising a light transmissive resin containing a light transmissive diffusing material, on at least part of the interface between the light transmissive diffusing material and the light transmissive resin of the light diffusing layer, is inserted a layer having a lower refractive index than those of the light transmissive diffusing material and resin wherein the haze value on the surface of light diffusing layer is three or more, and the difference between the haze value along the normal and that along the lines ±60° apart from the normal is four or less.
Dependencies are inferred from the claim text.