Multifunctional optical film, and surface light source device and liquid crystal display employing the optical film

A multifunctional optical film comprising:

• a transparent substrate;
• and
• at least one of a light-focusing layer and a light-diffusing layer being disposed on at least a surface of the transparent substrate,
• wherein the light-focusing layer comprises at least one selected from the group consisting of high-refractive silicone resins as represented by Formula 1 below, and
• wherein the light-diffusing layer comprises at least one selected from the group consisting of low-refractive silicone resins as represented by Formula 2 below:
• wherein,
• R1, R2, R3, R4, and R5 are each independently hydrogen, a substituted or unsubstituted C1-C30 aliphatic hydrocarbon, a substituted or unsubstituted C1-C30 aromatic hydrocarbon, a substituted or unsubstituted C1-C30 silyl group, a substituted or unsubstituted C1-C30 allyl group, a substituted or unsubstituted C1-C30 acyl group, an amine group, a halogen atom, a hydroxy group, a carboxyl group, a nitro group, or an alkaline metal;
• M is silicon, aluminum, titanium, or zirconium;
• and
• n1, n2, m1, and m2 are each independently an integer of 2 to 300,000.