LIGHT DIFFUSING FILMS, METHODS OF MAKING THE SAME, AND ARTICLES USING THE SAME

摘要

Disclosed herein are light diffusing films, methods of making the same and articles using the same. In one embodiment, a method of making a light-diffusing film comprises: mixing about 90 wt. % to about 99.999 wt. % of a powdered polycarbonate and about 0.001 wt. % to about 3 wt. % light-diffusing particles to form a mixture, wherein weight percents are based on a total weight of the light-diffusing film; melting the mixture to form a melt; and extruding the melt in the form of a sheet to form the light-diffusing film. The light-diffusing film comprises a hiding power of about 0 to 0.5 that is mathematically described by the following equation: $\mathrm{Hiding}\mathrm{power}\left(\%\right)=1-\frac{\sum _{i=1}^{n-1}L_i\left(\mathrm{on}\right)}{\sum _{j=1}^{n-1}L_j\left(\mathrm{off}\right)}x100$ wherein: L_i(on) is luminance above i^th cold cathode fluorescent lamp, L_j(off) is luminance at a midpoint between cold cathode fluorescent lamp j and cold cathode fluorescent lamp j+1, and n equals number of CCFL lamps.