| 摘要 |
The object of the present invention is to obtain high luminance with low power consumption. Convexes are formed on one side face of a light-guiding plate on a light source side of the light-guiding plate. The convexes are formed at minute pitches in parallel with the longitudinal direction of the one side face. An isosceles right triangle is selected as the sectional shape of the convexes. Light having entered from the one side face is diffused and reflected by a diffuse reflection layer, and light reflected by a reflection plate is emitting from a light-outgoing surface. The light having entered from the one side face is also directly emitted from the light-outgoing surface. The emitted light is diffused by a diffusion plate to irradiate, for example, the side opposite to the display side of a liquid crystal display panel in which the lighting device of the invention is to be incorporated. By making the one side face of the light-guiding plate uneven, the quantity of light entering the light-guiding plate and the quantity of light emitting from the light-guiding plate can be increased and the luminance of the lighting device can be enhanced.
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