Edge-Light Backlight Unit Using Optically Patterned Film with Plural Light-Emitting Diodes Placed on Side as Light Source

Abstract

In an edge-light backlight unit using an optically patterned film (OPF backlight unit) with plural light-emitting diodes (LEDs) placed on the side as a light source, dark areas are easily generated between LEDs, because the OPF backlight unit mainly uses the total reflection induced by optical patterns formed on the OPF. Such dark areas were eliminated by narrowing the interval between optical patterns between LEDs and widening it near LEDs. By adjusting the interval between optical patterns across the entire area additionally, a luminance distribution in a radiation plane suitable for liquid crystal displays (LCDs) was realized. Moreover, viewing-angle-dependent luminance distribution can be narrowed by adjusting the shape of the lens-shaped optical pattern. Thus, the OPF backlight unit using plural LEDs was shown to be suitable for small-area LCDs.

Thermal management of edge‐lit wide color gamut backlight for LCD using red laser diodes and cyan LEDs

“…The diffusive elements provided on the back of the LGP spread the light so that the light ends up on the liquid crystal cells as a surface light source. 18 A widely used method for the left/right edge-lit is to use 1D dimming for contrast improvement and to scan the backlight aria block in the direction of the address scanning of the LCD panel for better motion portrayal. 19,20 The sample of cyan LED used for our research and development has a rated output of about 150 mW.…”

Transparent thermoplastic resin with electron beam cross‐linking

“…Various high performance optical modules for digital equipment have been recently developed, such as the compact camera modules of cellular phones, which show improved image quality as well as a reduction in the module size [1] and high optical efficiency of light‐emitting diode (LED) lights [2]. Back‐light units used for liquid crystal displays (LCDs) are required to be brighter, slimmer, and lighter and exhibit increased light‐use efficiency [3, 4]. Such optical units and modules typically use plastic optical lenses, because they are low cost and lightweight.…”

Injection Molded Optical Lens Using a Heat Resistant Thermoplastic Resin with Electron Beam Cross-Linking

“…2) Back-light units used for liquid crystal displays are required to be brighter, slimmer and lighter and to show higher light-use efficiency. 3,4) These optical units and modules typically use plastic optical lenses, due to their low cost and light-weight characteristics. Plastic optical lenses are produced by injection molding machines which enable high-volume manufacturing and cost effective production.…”