Philips' Eco TV sips power, saves rainforest - CES 2008 - Consumer Electronics Show - CNET.com:

"At CNET, we take HDTV power consumption seriously, which helps explain our excitement when Philips announced its Eco TV. The 42-inch, 1080p resolution, flat-panel LCD, model 42PFL5603D (due in March, $1,399 MSRP), is packed with power-saving features.
Chief among them is the ability to dim the backlight--by up to five times peak brightness--in response to program material, much like the 'local dimming' found on Samsung's LED-based LN-T4681F. Dimming the backlight in darker scenes has the dual benefit of saving power and improving black-level performance, according to the company. The backlight can also be dimmed via a room lighting sensor, so in dark rooms it will use less power. There's also traditional a 'power-saving' mode that caps the peak light output. All of these features can be turned on or off at the viewer's discretion, which should please videophiles since many of these features' potential effects, such as black-level fluctuation, could negatively impact home theater image quality."