Nitto-denko Corporation

Hin Hou

Taku Yamada

Kentarou Takeda

A method of easily manufacturing a light diffusion film by a continuous process, which achieves both good display properties and an increase in viewing angle when used in a liquid crystal display. A method of manufacturing a light diffusion film includes forming a laminate of an original light diffusion film and a photosensitive resin, wherein the photosensitive resin includes at least two types of materials that are different in refractive index from each other; and irradiating the laminate with a collimated laser beam from a side of the original light diffusion film, wherein a reflection hologram formation-preventing layer is located on a side of the laminate opposite from the side of irradiation of the laminate with a collimated laser beam. In the process of irradiating the laminate, the reflection hologram formation-preventing layer prevents formation of a reflection hologram on the photosensitive resin due to a reflected light from the irradiation.

Method of manufacturing light diffusion film, light diffusion film, polarizing plate, and liquid crystal display

A directional diffusion film with diffusion properties that vary depending on the incidence angle is characterized in that a diffusion axis direction is in the range of 20&#xb0; to 50&#xb0; with respect to a normal direction of the film, and a diffusion half-value angle is at least 20&#xb0; and lower than 90&#xb0;. The diffusion axis direction is a light irradiation direction in which the strongest diffusion light is obtained when the film is irradiated with light. The diffusion half-value angle is a diffusion angle at which intensity of outgoing diffusion light at a plane A is 50% of the peak intensity, with the plane A containing the normal direction and the diffusion axis direction of the directional diffusion film, when collimated light is incident at an incidence angle of 30&#xb0; from the normal direction of the directional diffusion film in the plane A. A polarizing plate containing the directional diffusion film. An LCD device containing the directional diffusion film.

Growing community of inventors

Ibaraki, Japan

Hin Hou