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60.4: Distinguished Paper : A Directional Backlight with Narrow Angular Luminance Distribution for Widening Viewing Angle of a LCD with a Front‐Surface‐Light‐Scattering Film
Author(s) -
Käläntär K.
Publication year - 2011
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.3621478
Subject(s) - backlight , liquid crystal display , optics , luminance , viewing angle , prism , scattering , light guide , materials science , light scattering , surface (topology) , full width at half maximum , physics , geometry , mathematics , light source
A directional backlight unit has been developed for widening the viewing angle of a TN‐LCD with a front‐surface‐light scattering film. The novel directional backlight has a diagonal of 34‐cm and is structured by light‐direction control micro features and an inverted prism film. The backlight has a round luminance cone of +/‐9 deg. and a uniform spatial distribution of 90%. In combination with the LCD, the narrow cone resulted in widening of the TN‐LCD's viewing angle up to 120 deg. FWHM.