| 摘要 |
In a light guide plate (23), light is introduced into a light transmitting plate member from an incidence plane (24). The introduced light goes out from a rear plane of the light transmitting plate member by effects of a prism (25). Thus, on the rear plane of the light transmitting plate member, surface emission is achieved. At this time, when the light projected on the incidence plane (24) has brightness nonuniformity, a flat area (26) is aligned with a dark area. Therefore, the light can be guided to the prism (25) while being reflected by the flat area (26). At the same time, outside the flat area (26), the light is diffusely reflected by effects of a light scattering structure (27). A part of the diffusely reflected light can be guided to on an extended line (33) of the flat area (26). Thus, sufficient light is guided to the prism (25) on the extended line (33) of the flat area (26). As a result, dark line is prevented from being generated on the light guide plate (23), and generation of the brightness nonuniformity can be eliminated. Brightness distribution as uniform as possible can be provided on the light guide plate (23). |
