View angle-restriction sheet and flat panel display

摘要

The view angle-restricting sheet includes an optically functional layer including: a plurality of first light transmission sections that are rectangular in cross section and arranged in a multi-stripe fashion; and one or more second light transmission section(s) that is/are each arranged between adjacent first light transmission sections. The first light transmission sections contain a light diffusing agent and a resin matrix. The proportion of the surface area occupied by the first light transmission sections with respect to the surface area of the optically functional layer is no less than 5% and no greater than 40%. The ratio (T1/W1) of the thickness (T1) to the width (W1) of the first light transmission section is preferably no less than 4 and no greater than 40. The average distance between adjacent first light transmission sections is preferably no less than 6 μm and no greater than 400 μm.

主权项

1. A view angle-restricting sheet comprising an optically functional layer which comprises:
a plurality of first light transmission sections that are rectangular in cross section and arranged in a multi-stripe fashion; and one or more second light transmission section(s) that is/are each arranged between adjacent first light transmission sections, wherein in the view angle restricting sheet, the first light transmission sections comprises a light diffusing agent and a resin matrix, a proportion of a surface area occupied by the first light transmission sections with respect to a surface area of the optically functional layer is no less than 5% and no greater than 40%, a refractive index (n1) of the matrix is greater than a refractive index (n2) of the second light transmission section and a difference (n1−n2) between the refractive index (n1) of the matrix and the refractive index (n2) of the second light transmission section is no less than 0.15, the refractive index (n1) of the matrix is greater than a refractive index (n3) of the light diffusing agent, and a difference (n1−n3) between a refractive index (n1) of the matrix and a refractive index (n3) of the light diffusing agent is no less than 0.03, a ratio (T1/W1) of a thickness (T1) to a width (W1) of the first light transmission section is no less than 7 and no greater than 40, and an average distance between adjacent first light transmission sections arranged is no less than 50 μm and no greater than 400 μm, a sharp image is displayed in a front direction using rays of light not entering the first light transmission section among rays of light having entered the second light transmission section, and leakage of information through glimmering from an oblique direction is prevented by allowing rays of light having entered the first light transmission section to exit after being diffused.