Lighting device, display device, and television receiver

摘要

Uneven brightness is less likely to occur in a backlight unit. In a backlight unit 12, suppose that a maximum value and a minimum value of light reflectance of at least a first surface 30a of a diffuser plate 30 facing a hot cathode tube 17 are defined as Rmax Rmin, respectively, a rising proximal position BP of each rising portion 20b of a reflection sheet 20 is provided to overlap with an area of the diffuser plate 30 having light reflectance R that satisfies the Expression given below, and a rising distal position EP of each rising portion 20b is provided not to overlap with an area of the diffuser plate 30 having the light reflectance R that satisfies the Expression given below.
(Rmax−Rmin)/2+Rmin

主权项

1. A lighting device comprising: a light source; a chassis including a bottom plate arranged on a side opposite from a light exit side with respect to the light source and housing the light source; an optical member arranged on the light exit side with respect to the light source; and a reflection sheet arranged within the chassis and including a rising portion rising from a bottom plate side toward the optical member, the rising portion has a rising proximal end position and a rising distal end position, the reflection sheet being configured to reflect light, wherein:
the chassis includes a portion facing the optical member and the portion is defined in a light source arrangement area in which the light source is arranged and a light source non-arrangement area in which no light source is arranged, and the optical member has a light source arrangement area overlapping portion overlapping with the light source arrangement area and a non-arrangement area overlapping portion overlapping with the non-arrangement area, and at least a surface of the light source arrangement area overlapping portion that faces the light source has a light reflectance higher than at least a surface of the non-arrangement area overlapping portion that faces the light source; and suppose that a maximum value and a minimum value of the light reflectance on at least a surface of the optical member facing the light source are defined as Rmax and Rmin, respectively, the rising proximal end position overlaps with an area of the optical member having light reflectance R that satisfies following Expression (1), and the rising distal end position is provided not to overlap with the area of the optical member having the light reflectance R that satisfies a following Expression (1),
(Rmax−Rmin)/2+Rmin