[CEATEC] JVC's 42-inch LCD TV Achieves 100,000:1 Contrast Ratio by LED Backlight

Oct 3, 2007
Shinya Saeki, Nikkei Electronics
JVC's 42-inch LED-backlit LCD TV (right). The company achieved 100,000:1 contrast ratio video rendering by locating LEDs right under the LCD panel and controlling luminance by 128 areas. Color reproduction range has also been extended to 116% of the NTSC specification.
JVC's 42-inch LED-backlit LCD TV (right). The company achieved 100,000:1 contrast ratio video rendering by locating LEDs right under the LCD panel and controlling luminance by 128 areas. Color reproduction range has also been extended to 116% of the NTSC specification.
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Victor Company of Japan Ltd. (JVC) presented a 42-inch LCD TV, which has boosted a contrast ratio when rendering video to 100,000:1 through the adoption of LED backlight sources at CEATEC Japan 2007 being held from Oct. 2, 2007.

JVC employed its proprietary "area control LCD driver" technology to raise the contrast ratio. Locating LEDs right under the LCD panel, the driver controls the luminance of the panel surface in 128 areas. Specifically, the driver controls the luminance of the backlight system for each of the 128 areas in the LCD panel after analyzing the luminance distribution of the video input signal.

Regarding the control areas, JVC said that the area control effects lower if the number of compartment areas is under 128 and the technology costs too much to incorporate if the number rises above 128. The backlight system uses 1,151 RGB LEDs in total, the company said.

By controlling the luminance of the backlight system, JVC succeeded in reducing power by about 50% compared with its existing relevant model. Also, the employment of LEDs for the backlight system broadened the color reproduction range to 116% of the NTSC specification, said JVC.