SIDE LIGHT TYPE PLANE LIGHT SOURCE DEVICE AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To prevent an adhesion of a reflection sheet to a light guiding plate and a quality reduction of an illumination light by disposing the reflection sheet for reflection the illumination light leaking from a back surface and again injecting to the light guiding plate at the back surface of the light guiding plate at a reverse side of an outgoing surface and forming a fine convex/ concave on a surface of the reflection sheet at the light guiding plate side. SOLUTION: A reflection sheet 14 is prepared by forming a fine irregular surface due to a transparent convex/concave surface H on a whole side surface of a light scattering light guiding plate of a sheet material 14A. The sheet material 14A is constituted by an irregular reflection member such as a white PET film efficiently reflecting an illumination light and is formed of a surface with a surface an the convex/concave surface H side flat. On the other hand, the convex/concave surface H is formed of adhering a transparent resin to mixed with a light-transmittable fine member to the sheet material 14A and curing it. The light-transmittable member is a light-transmittable beads 14B and an acrylic chip of smooth surface with a diameter D1 of 5 to 10 μm is used.