| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an enlarging member for two-dimensional viewing angles which does not decrease surface luminance or contrast by stray light and which has little dependence on angles and little scattering reflection of external light and to provide a display device using the enlarging member for two-dimensional viewing angles. <P>SOLUTION: Two light diffusing sheets each having a plurality of unit lenses having a trapezoid cross section arranged in a one-dimensional direction or two-dimensional direction are stacked with the phases of the sheets shifted by about 90°. In each light diffusing sheet, the unit lens is formed in such a manner that a lower bottom of the trapezoid is used as an entrance for light, an upper bottom as an exit and oblique lines as a total reflection part. The unit lens is formed of a high refractive index material, a part of a triangular cross section held between adjoining unit lenses is formed of a low refractive index material having lower refractive index than that of the high refractive index material and further light absorption particles are added into the low refractive index material. <P>COPYRIGHT: (C)2008,JPO&INPIT |
