Directional display apparatus
A technology of directional display and directional distribution, which is applied in the directions of optics, instruments, electrical components, etc., can solve the problems of display brightness reduction and achieve the effect of minimum cost
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[0119] Some different embodiments employ common elements, for the sake of simplicity, these common elements will be given common reference numerals and their description will not be repeated. In addition, descriptions of elements in each embodiment are equally applied to the same elements in other embodiments, and to elements having corresponding effects mutatis mutandis. Additionally, the figures illustrating embodiments of the display show only a portion of the display for clarity. In fact, this structure can be repeated over the entire area of the display.
[0120] In this specification, the optical axis direction (director direction, or extraordinary axial direction) of a birefringent material will be referred to as a birefringent optical axis. It should not be confused with the optical axis of a lens, which is defined in the usual manner in geometric optics.
[0121] A cylindrical lens describes a lens in which an edge (which has a radius of curvature and possibly oth...
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