| 摘要 |
<p>Disclosed are a light control plate, a light control plate unit, a surface light source device, and a transmission image display device all enabling a higher luminance uniformity when viewed from the front. The light control plate unit (40) is provided with first and second light control plates (401, 402) arranged in order in the thickness direction. The extension directions of first projecting sections (431) and second projecting sections (432) formed on the upper surfaces of the light control plates are substantially parallel to one another. The contour shape of the second projecting sections is a right triangle. If the axis passing through both ends of the first projecting sections on a cross section of the first projecting sections is the x axis, if an axis perpendicular to the x axis is the z axis, and if the length of the first projecting sections along the x axis is wa, the contour shape of the first projecting sections is expressed by z(x) satisfying 0.95z0(x)=z(x)=1.05z0(x) when x is -0.475wa=x=0.475wa, and z0(x) satisfies the expression. With this, (In expression (1), C2k for k=1 to 8 is a prescribed constant.)</p> |
