| 摘要 |
<p>A lighting device (1401; 1402; 1403; 1404) comprises a semi-transparent plate-shaped light source (1409; 1400). The transparent plate-shaped light source may be a passive plate-shaped light source (1400) comprising a transparent light guide plate body (1410) with two substantially parallel main surfaces (1411; 1412), and wherein at least one of the main surfaces (1411; 1412) is provided with permanent obtrusions (1415). The obtrusions (1415) may be implemented as material portions projecting from the surface and/or as indentations recessed in the surface. The obtrusions (1415) may be arranged by sandblasting, preferably in a pattern of dots, wherein the dots may have sizes in the range between 20 and 200μm, preferably approximately 100μm, and wherein the dot density may be in the range between 5 and 500 dots/cm2.</p> |
