OPTICAL MEMBER AND BACKLIGHT UNIT EMPLOYINT IT

摘要

[PROBLEMS] An optical member in which the viewing angle can be widened while sustaining a high luminance and the defect of a display can be made inconspicuous, and a backlight employing it. [MEANS FOR SOLVING PROBLEMS] When a substantially collimated light impinges on the plane of incidence (9), an outgoing light from the outgoing plane (10) exhibits anisotropy in its intensity along an azimuth of 30˚to normal to the outgoing plane (10), the anisotropy being such that the ratio between a highest intensity and a lowest intensity in the intensity distribution of outgoing light intensity along the azimuth of 30˚is set to not smaller than 1.2.