A directional backlight with narrow angular luminance distribution for widening the viewing angle for an LCD with a front‐surface light‐scattering film |
| |
Authors: | Kälil Käläntär |
| |
Affiliation: | Global Optical Solutions, R&D Center, 2‐50‐9 Sanda‐cho, Hachi‐oji‐shi, Tokyo 193‐0832 Japan. |
| |
Abstract: | Abstract— A directional backlight unit has been developed to widen the viewing angle of a TN‐LCD with a front‐surface light‐scattering film/layer. The novel directional backlight has a diagonal of 34 cm and is structured by light‐direction‐control optical micro‐features and an inverted prism film. The backlight has a symmetrical round luminance cone of ±9° and a uniform spatial distribution of 88%. By using this backlight unit in combination with an LCD, the narrow cone resulted in widening of the TN‐LCD's viewing angle up to 120° at full width at half‐maximum. |
| |
Keywords: | Directional BLU optically integrated light guide Λ ‐grove optical microstructure V‐groove U‐groove |
|
|