| 摘要 |
<P>PROBLEM TO BE SOLVED: To retain high front brightness while canceling moire interference fringes in a multilayer display with a narrow interval between respective image display screens. <P>SOLUTION: A diffusion sheet 2 is provided between two screens 1, 3 for image display, wherein the diffusion sheet has a projecting and recessing structure formed at least on a surface thereof, of which the distribution of intensity of outgoing light with respect to the diffusion angle is approximated with a curve formed by adding a first normal distribution curve and a second normal distribution curve having a half value width less than that of the first normal distribution curve, wherein the half value width of the second normal distribution curve is 3° or less, and a ratio of a peak value of the first normal distribution curve to that of the second normal distribution curve is 1.0 or more and less than 3.5. <P>COPYRIGHT: (C)2011,JPO&INPIT |
