| 摘要 |
<p>The invention comprises a fluid-tight light box (50) containing a cold cathode light source (41) activated by a high frequency oscillator (320), small enough to be confined in the box. At least the box bottom interior is coated with a crincle or matte finish (309) to cause uniform brightness at a window (51) in the upper side of the box. The oscillator is preferably also coated (57) to avoid shadow effects. A milky element (59) may comprise the window or be positioned adjacent thereto to comprise a light diffuser for a transparency (60) adjacent thereto or the transparency may be coated on its reverse side with a diffuser coating. This display or portrait exhibitor (213) may measure less than 51 mm thick and this is the reason the light reflective path and materials are so critical.</p> |
