| 摘要 |
An optical sheet, a backlight device, and a liquid crystal display device are provided. The beam-condensing optical sheet includes a large number of irregularity portions arranged on one main surface of a light-transmissive base, in which a pitch of arrangement of the irregularity portions is 110 mum or more and 330 mum or less, and surface roughness (Ra) of the irregularity portion is 0.1 mum or less. |
