Design and fabrication of submicron period grating as an imprinted light guide plate for a backlight unit

摘要

The imprinted light guide plate (LGP) fabricated through a diffractive grating was studied for theedge-lit display. Such kind of backlight unit (BLU) can save prismatic sheets. The grating dimen-sion was determined through preliminary experiments, modeling, and computation. Based on thedesigned parameters, a submicron period grating was fabricated and was transferred to the LGP.Consequently, the outcoupling luminous flux, on-axis luminance, and homogeneousness and chro-matic dispersion were measured through the prototyped samples. Compared to the conventionalBLU,theimprinteddiffractivegratingworkswellasthelightextractorbutstillneedstobeimprovedto meet the illumination characteristics required for the liquid crystal display (LCD) BLU.