The present invention provides a composite optical film including a brightness enhancement film, a high refractive-index layer, and an intermediate layer. The brightness enhancement film has a plurality of brightness enhancement structure parallel to each other, and a top surface and a bottom surface opposite to each other. The brightness structure is disposed on the top surface. The high refractive-index layer is disposed on the bottom surface, and includes a film and a plurality of inorganic nano-particle disposed within the film. The intermediate layer is disposed between the brightness enhancement film and the high refractive-index layer.

The invention provides a shutter device comprising a shutter blade structure. The shutter blade structure comprises at least one shutter blade which is formed by compounding a carbon nanotube structure and a polymer, wherein the carbon nanotube structure comprises a plurality of carbon nanotubes, and the adjacent carbon nanotubes are tightly connected through Van Der Waals force. The invention also provides a shutter blade.

The invention provides a shutter device comprising a shutter blade structure which comprises at least one shutter blade. The shutter blade comprises at least two carbon nano tube composite structures; each carbon nano tube composite structure is formed by compounding a carbon nano tube structure and a polymer; each carbon nano tube structure comprises a plurality of carbon nano tubes; the carbon nano tubes extend in preferred orientation of the same direction; and an intersection angle Alpha is formed between the extending direction of the carbon nano tubes of each carbon nano tube composite structure and the extending direction of the carbon nano tubes of the adjacent carbon nano tube, and Alpha is more than zero degree and less than or equal to 90 degrees. The invention further providesthe shutter blade.

The invention provides a shutter device, which comprises a shutter blade structure, wherein the shutter blade structure comprises at least one shutter blade; the shutter blade comprises a plurality of carbon nanotubes; and adjacent carbon nanotubes are tightly connected by a Van der Waals' force. The invention also provides the shutter blade.