COMPLEX LIGHT CONTROL PLATE, SURFACE SOURCE DEVICE AND TRANSMISSION-TYPE IMAGE DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a complex light control plate which prevents uneven illuminance more stably.

SOLUTION: The complex light control plate 1 includes first to fourth light control plates (10 to 40) laminated on one another in this order. Each of the first light control plate 10 and the third light control plate 30 is defined as below, the first direction X21 of the second light control plate is parallel with the first direction X11 of the first light control plate; the first direction X31 of the third light control plate 30 is orthogonal to the first direction X11 of the first light control plate; and the first direction X41 of the fourth light control plate 40 is orthogonal to the first direction X11 of the first light control plate. In the light control plate, the shape of the outline of projecting portion in a cross-section orthogonal to the first direction is represented by z(x) that satisfies the expression (1): 0.95×Z0(x)≤z(x)≤1.05×Z0(x) [where Z0(x) is defined by expression (2), where ha is in the range from 0.25 to 0.75 wa and ka is equal to or greater than -1.0 but less than 0].

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