Edge-Light Backlight Unit Using Optically Patterned Film

Abstract

A novel edge-light backlight unit using an optically patterned film (OPF backlight unit) for liquid crystal displays (LCDs) is composed of a light guide plate bonded to the top of fine lenses formed on the OPF, a diffusive sheet, a reflective sheet and a light source. A viewing-angle-dependent luminance distribution of the OPF backlight unit was controllable by changing the shape of a fine lens used for the extraction of light propagating through a light guide plate and the direction control of radiating light, and a luminance distribution in a radiation plane suitable for LCDs was realized by adjusting the interval between lenses. Moreover, the extraction efficiency of the OPF backlight unit was greater than that of a conventional backlight unit. Thus, the OPF backlight unit was shown to be promising for the realization of a brighter, lower power consumption, slimmer and lighter LCD than conventional LCDs.

P‐99: A Backlight Based on a Laser Diode and Its Design Considerations

“…Some rays reach these regions and are extracted toward an observer. Therefore, the shape and distribution of these regions are important design parameters that determine backlight characteristics and these issues have been studied in [8]. Here, we use an off-the shell, blue-emitting LD unit and an existing OPF/light-guide combination.…”

High-efficiency backlight module with two guiding modes

“…The crisscross LGP is composed of an LGP and optically patterned film (OPF). The OPF is in direct contact with the LGP, secured by a photo-curable adhesive, so that light rays can propagate directly through the optical window [11,12]. The LGP's upper surface is patterned with prism-shaped microstructures.…”

Optical film with microstructures array for slim-type backlight applications

“…the light sources, reflectors, diffusers (diffuser panels), and brightness enhancement films (BEFs) must be properly designed and integrated. The problem of improving the optical efficiency and light directing capability of the BEFs has received extensive attention in the literature [4][5][6][7]. In addition, the problem of optimizing the composition and fabrication of efficient diffuser films has also been extensively researched [8][9][10][11][12].…”

“…As shown, the module comprises a stacked arrangement of multiple light sources, a diffuser film, and one or two brightness enhancement films (BEF). In practice, the surface of the BEF is generally carved with one of two different microstructures, namely prisms or pyramids, with the choice of microstructure depending on the brightness enhancement requirements of the particular application [4][5][6][7]. When using a BEF with prismatic structures, two orthogonal BEFs are required to collimate the light from the diffuser.…”