| 摘要 |
PROBLEM TO BE SOLVED: To provide a backlight which can be used for both transmission type and a reflection type lamp and is bright enough even in a dark place.SOLUTION: The backlight has a light-guide type surface light emitter 2 and a reflecting member 7 arranged from observation side. The surface light emitter 2 uses a transparent base material containing light-diffusion particles and guides light in the longitudinal direction of the transparent base material while scattering light in the thickness direction of the transparent base material. The transparent base material is a light-guide plate having a haze value of 30% or less in thickness direction, and is formed so that an operational value (m-1/%) obtained by dividing its brightness reduction coefficient E (m) by the haze value (%) per 5 (mm) of the transparent base material is 0.55 (m/%) or more and 10.0 (m/%) or less. Further, the reflection member 7 contains a luminous pigment. |
