| 摘要 |
<p>The irradiation or bright line of a pupil shape generated around an opening window of a rim sheet (light shielding plate) is suppressed by leakage light. On a light guide plate (33), a thick light introduction unit (34) and a thin light guide main body (35) are sequentially formed. A light source (40) is arranged to face a light incidence cross section (36) of the light introduction unit (34). Three optical sheets, which are a diffusion sheet (43) and two prism sheets (44, 45), are overlapped on the upper surface (light discharge surface (39)) of the light guide main body (35). Also, a rim sheet (46) is overlapped on the optical sheet and has an opening window (47) for passing light discharged from the light discharge surface (39). One end of the diffusion sheet (43) on the light source side is more protrusive than the end of the prism sheets (44, 45). At least one side of the protrusive portion of the diffusion sheet (43) is covered by a light shielding member (49). The end of the protrusive portion of the diffusion sheet (43) is bonded and fixated on a print substrate (41) mounted with the light source (41).</p> |
