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EE Times-Asia > Optoelectronics/Displays

LEDs for uniform illumination

Posted: 17 Dec 2007 ?? ?Print Version ?Bookmark and Share

Keywords:LED backlight module? TFT-LCD TVs? hybrid LED?

Delta Electronics Inc. has developed an energy-saving LED backlight module (BLM), which allows LEDs to achieve maximum homogeneous illumination.

The LED BLMs are available in 32-, 40- and 42-inch form factors. Applications range from small cellphones to large outdoor exhibition boards as well as lighting for both interior and exterior applications. Delta has design-in capabilities for both hybrid LED BLMs and full LED BLMs for TFT-LCD TVs.

Compared with traditional cold cathode fluorescent lamp (CCFL) BLMs, hybrid LED BLMs increase red light purity and brightness by mixing cyan CCFLs with red LEDs, which increases the NTSC gamut by 5 percent and contrast ratio by 44 percent, as well as decreases loss of light due to LCD panel color filter, according to Delta.

Full LED BLMs feature triangular arrangement built on the PCB, which reduces the number of LEDs by 10 percent. Other advantages include brightness uniformity of 90 percent, an NTSC gamut of 100 percent, and a contrast ratio of 2,042

- Ismini Scouras

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