Optical diffusing layer, optical diffusing sheet, and optical element
AssigneeNitto Denko Corporation
InventorsTakuya Matsunaga, Hiroshi Shibata, Takayuki Shigematsu, Masayuki Satake, Takashi Shouda
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Abstract
An optical diffusing layer comprising a resin coated layer having a surface fine concavo-convex structure, wherein an average of peak-to-peak distance (Sm), an average of center line surface roughness (Ra), and an average of ten-point surface roughness (Rz) on the surface with fine concavo-convex structure satisfy specified equations, is capable of maintaining antiglare property and screen glare simultaneously controlled, when applied to an LCD in which high definition is required.
Claims16
An optical diffusing layer comprising a resin coated layer having a surface fine concavo-convex structure which is formed by particles having a particle size of 2 to 5 μm, wherein an average of peak-to-peak distance (Sm), an average of center line surface roughness (Ra), and an average of ten-point surface roughness (Rz) on the surface with fine concavo-convex structure satisfy following equations:
- Sm≦80 μm,
- 0.1≦Ra≦0.17 μm, and
- Rz≦9Ra,
- said optical diffusing layer further comprising a low refractive index layer having a refractive index lower than a refractive index of the resin coated layer disposed on the concavo-convex structure surface of the resin coated layer.
An anti-glare outermost layer;
- comprising a resin and particles having a particle size of 2 to 5 μm dispersing therein, said outermost layer having a concave-convex surface having the following profiles:
- Sm≦80 μm;
- 0.1≦Ra≦0.17 μm;
- and
- Rz≦9·Ra,
- wherein Sm is an average of peak-to-peak distance, Ra is an average of center line surface roughness, and Rz is an average of ten-point surface roughness,
- said anti-glare outermost layer further comprising a low refractive index layer having a refractive index lower than a refractive index of the anti-glare outermost layer, said index layer being disposed on the concave-convex surface of the anti-glare outermost layer.
Dependencies are inferred from the claim text.