| 摘要 |
PROBLEM TO BE SOLVED: To develop an optical film forming a transmissive, or reflective and transmissive combined, liquid crystal display device which is thin, lightweight and has bright and easy-to-see display by efficiently converting the optical path of the incident light from the side face direction into the viewing direction. SOLUTION: The optical film is provided with an adhesive layer 12 on one surface of a transparent film 11 with <=0.1 difference in refractive index between itself and its surface layer and a repeatingly projecting and recessing structure 13 equipped with an optical path converting slope A1 directed to nearly defined directions with 35-48 deg. inclined angle with respect to the film surface on the other surface of the transparent film. Consequently the optical film is utilized for the transmissive mode liquid crystal display by adhering it to the liquid crystal display panel, arranging an illuminator to the side face and efficiently converting the optical path of the light incident from the side face into the viewing direction of the panel. Furthermore, the optical film is utilized for the reflective mode liquid crystal display by providing a flat surface part between the optical path converting slopes of the optical film, efficiently making external light incident and reflecting the incident light via a reflection layer.
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