| 摘要 |
A base film for optical sheet, optical sheet and liquid crystal display module is provided to improve brightness by remarkably increasing efficiency for use of light, and offer base film for optical sheet which is suitable to direct type liquid crystal display module and liquid crystal display module of opposing edge light type, optical sheet, and liquid crystal display module which uses the same. The base film for optical sheet which is base film for optical sheet(1) of resin formed as a square, has optical anisotropy and a characteristic that the absolute value of the angle(alpha) of the direction of the crystal axis to narrow side direction is more than pi/8 and less than 3pi/8. As retardation value of base film, the value of more than 70nm and less than 320nm is appropriate. As matrix resin comprised by base film, polyethyleneterephthalate or polycarbonate is appropriate. Optical sheet of the present invention has the optical layer laminated on the base film for optical sheet and one side of the same. Liquid crystal module of the present invention has liquid crystal display devices, the optical sheet and direct type backlight. |
