| 摘要 |
PURPOSE: To make it possible to freely set the size and shape of a light source as well and to expand the degree of freedom in design by providing a plate with a light diffusing part at its arbitrary point facing an LED. CONSTITUTION: A saw tooth part 4 having fine ruggedness as the light diffusing part is formed at the point of the inside surface of the plate 3 facing the paired LED chip 1. The summits of the peak parts of this saw tooth part 4 are flush with the inside surface of the plate 3. Namely, the saw tooth part 4 is formed within the thickness of the plate 3. As a result, the linear light emitted from the paired LED chip 1 is irregularly reflected and diffused at the time of passing the saw tooth part 4 of the plate 3, passes the interior of the plate 3 from the entire part of the saw tooth part 4 and advances toward the exterior of the LED display device. The entire part of the saw tooth part 4 of the plate 3, therefore, appears to glow over the entire part and the effect of making the light source visible over the entire part of the saw tooth part 4 is obtd. when the LED is viewed from the exterior. |
