LIGHT DIFFUSION MEMBER, BASE MATERIAL FOR LIGHT DIFFUSION MEMBER PRODUCTION, DISPLAY DEVICE USING SAME AND METHOD FOR PRODUCING LIGHT DIFFUSION MEMBER

摘要

According to an aspect of the present invention, there is provided a light diffusion member which includes a light diffusion film, a polarizing film, and a retardation film. The light diffusion film includes a first substrate, a light diffusion portion, and a light shielding layer. The polarizing film includes a second substrate and a polarization layer. The retardation film includes a third substrate and a retardation layer. The retardation layer is formed from a birefringence body which has optically-negative uniaxiality. An alignment direction of the birefringence body is different in a thickness direction thereof. A slow axis of the retardation layer is positioned at azimuth between a transmission axis and an absorption axis of the polarization layer.

主权项

1. A light diffusion member comprising:
a light diffusion film; a polarizing film; and a retardation film, wherein the light diffusion film includes
a first substrate which has optical transparency,a light diffusion portion which is provided on a first surface of the first substrate, anda light shielding layer which is provided in a region of the first surface of the first substrate, other than a region in which the light diffusion portion is formed, the light diffusion portion includes
a light-emitting end surface which is in contact with the first substrate, anda light incident end surface which faces the light-emitting end surface and has an area larger than an area of the light-emitting end surface, a height from the light incident end surface to the light-emitting end surface is larger than a thickness of the light shielding layer, the polarizing film includes
a second substrate which has optical transparency and is disposed on the light incident end surface side of the light diffusion portion, anda polarization layer which has a transmission axis and an absorption axis which are provided on a first surface of the second substrate, the retardation film includes
a third substrate which has optical transparency and is disposed on an opposite side of a side of the polarizing film, on which the light diffusion film is disposed, anda retardation layer which is formed from a birefringence body which has optically-negative uniaxiality and is provided on the first surface of the third substrate, and in which an alignment direction of the birefringence body is different in a thickness direction, and a slow axis of the retardation layer is positioned at azimuth between the transmission axis and the absorption axis of the polarization layer.