Abstract: A brightness enhancement film of a backlight module includes a substrate and a plurality of microstructure units. The substrate has an edge having an extension direction. The microstructure units are jointed on a surface of the substrate with the junction areas. The junction areas have different extension directions and different extension lengths. The extension directions and extension lengths of the junction areas are combined to form a resultant vector. An included angle is formed between a direction of the resultant vector and the extension direction of the edge of the substrate, and a range of the included angle is from negative 45 degree to positive 45 degree.

Abstract: A backlight module includes a light source and an integrated optical film. The integrated optical film includes a base, a brightness enhancement layer and a diffusion layer. The base has a first surface and a second surface opposite to each other. The brightness enhancement layer has a plurality of brightness enhancement columns and a plurality of diffusion particles. The brightness enhancement columns are disposed on the first surface. The diffusion particles are dispersed in the brightness enhancement columns. The diffusion layer has a plurality of granular patterns disposed on the second surface in an irregular arrangement. Light beams emitted from the light source pass through the diffusion layer, the base and the brightness enhancement layer in proper order.

Abstract: A backlight module is used to supply a light beam to a liquid crystal panel. The backlight module includes an optical film set. The optical film set includes a diffusion film for diffusing the light beam; a prism sheet for receiving the light beam from the diffusion film and propagating the light beam to the liquid crystal panel. The prism sheet is close to the liquid crystal panel, and has a plurality of projections, whose cross section is in cone-shape, disposed on a surface thereof adjacent to the liquid crystal panel. Some of the projections have a plurality of defects.

Abstract: The invention provides a process for preparing a positive-negative-blended optical retardation film comprising coating a solution consisting of discotic and rod-like liquid crystal onto an alignment layer after unidirectionally rubbing treatment on a substrate, subsequently heating the coating to obtain a film consisting of discotic and rod-like liquid crystal with uniform arrangement, and then curing it through exposing under a UV-irradiation to obtain a positive-negative-blended optical retardation film with excellent viewing angle; and a positive-negative-blended optical retardation film. Further, the invention also provides a liquid crystal element and a liquid crystal device having said positive-negative-blended optical retardation film.

Abstract: The invention provides a process for preparing a positive-negative-blended optical retardation film comprising coating a solution consisting of discotic and rod-like liquid crystal onto an alignment layer after unidirectionally rubbing treatment on a substrate, subsequently heating the coating to obtain a film consisting of discotic and rod-like liquid crystal with uniform arrangement, and then curing it through exposing under a UV-irradiation to obtain a positive-negative-blended optical retardation film with excellent viewing angle; and a positive-negative-blended optical retardation film. Further, the invention also provides a liquid crystal element and a liquid crystal device having said positive-negative-blended optical retardation film.