OPTICAL SHEET AND ITS MANUFACTURING METHOD, AND DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an optical sheet by which a display device can be made thin while suppressing an increase in the cost of the display device.

SOLUTION: A mirror array 22 is arranged on the main surface of a base material sheet 21. The mirror array 22 is obtained by forming a light reflecting film 24 on the surface of a rugged sheet 23 on which a plurality of slopes are arrayed in a grating-like form. The light reflecting film 24 has reflective surfaces 24A correspondingly to the plurality of slopes of the rugged sheet 23. Each of the reflective surfaces 24A reflects divergent luminous fluxes made incident obliquely from the direction different from the normal line of the principal surface of the base material sheet 21 (incident light from a projection part 10) and makes them almost parallel luminous fluxes. The reflective surfaces are disposed to be opposed to the principal surface of the base material sheet at such angles θi (0°≤θi≤90°; i is 1 to the total number of reflective surfaces 24A) that the light made into parallel luminous fluxes can be made incident on the rear of a display part 30 at the angles equal to one another (at the angles almost perpendicular to the rear).

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