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Nara-shi, Japan

Masuda T.,Shrap Corporation | Ajichi Y.,Shrap Corporation | Kubo T.,Shrap Corporation | Yamamoto T.,Shrap Corporation | And 4 more authors.
Kyokai Joho Imeji Zasshi/Journal of the Institute of Image Information and Television Engineers | Year: 2010

We developed an ultra-thin RGB-LED backlight (BL) system for 52 "and 65" LCD-TVs. It is constructed by combining the structures of the direct-lighting and edge-lighting systems. The system can be used to control luminance both spatially and temporally with pulse-width-modulation-driven RGB-LEDs so that it can easily support local dimming techniques of an LCD-TV, which provides a high-quality image and have low power consumption. We describe how we improved the optical design of the tandem light guide (TLG) and thus make a 10-mm thick BL. We also introduce how to correct device-to-device variations and temperature characteristics of RGB-LEDs. Furthermore, we show how to estimate the optical properties of BLs in terms of the requirements for local dimming techniques. We found that a BL system Using TLGs has a higher contrast ratio between controllable and segmented blocks than conventional ones. This leads to our system being more suitable for local dimming techniques.

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