Comments on: Google Says All Black LCD Screens May Use More Energy http://www.greentechies.com/blog/2007/08/13/google-says-all-black-lcd-screens-may-use-more-energy/ Green Technology for the Office and Data Center Thu, 04 Dec 2008 05:43:12 +0000 http://wordpress.org/?v=2.6.2 By: Daniel Shields http://www.greentechies.com/blog/2007/08/13/google-says-all-black-lcd-screens-may-use-more-energy/#comment-162 Daniel Shields Tue, 28 Aug 2007 20:36:13 +0000 http://www.greentechies.com/blog/2007/08/13/google-says-all-black-lcd-screens-may-use-more-energy/#comment-162 To respond to David, the power will actually draw about 28.2 watts on Google.com vs. 29.5 watts on Blackle.com. This was the result of a test using FireFox and connecting a Watts Up? Electricity Meter on a 19" Dell monitor. I've published and included a link to a video on my blog at http://danalytics.blogspot.com/2007/08/blacklecom-energy-saving.html We do care, by the way, because this is an egregious appeal to our willingness to endorse the idea of being "green" to profit personally from that traffic. Sincerely, Daniel Shields To respond to David, the power will actually draw about 28.2 watts on Google.com vs. 29.5 watts on Blackle.com. This was the result of a test using FireFox and connecting a Watts Up? Electricity Meter on a 19″ Dell monitor. I’ve published and included a link to a video on my blog at http://danalytics.blogspot.com/2007/08/blacklecom-energy-saving.html

We do care, by the way, because this is an egregious appeal to our willingness to endorse the idea of being “green” to profit personally from that traffic.

Sincerely,

Daniel Shields

]]> By: David http://www.greentechies.com/blog/2007/08/13/google-says-all-black-lcd-screens-may-use-more-energy/#comment-158 David Tue, 14 Aug 2007 21:03:15 +0000 http://www.greentechies.com/blog/2007/08/13/google-says-all-black-lcd-screens-may-use-more-energy/#comment-158 The point is moot. An LCD's power draw is the backlight so as long as it is on, the set will draw more than 170 watts. Now, the LCD display itself will draw very little power if the transistors are all open (white screen) or closed (black screen). The highest power draw is a 50% gray, shifting to black, going back to gray, ON A CHECKERBOARD pattern, CHANGING every frame. This is the maximum load for the column drivers. It is true that the new displays are "normally black" so a black screen will draw fractionally less than a white screen. But does anyone really care. The point is moot. An LCD’s power draw is the backlight so as long as it is on, the set will draw more than 170 watts. Now, the LCD display itself will draw very little power if the transistors are all open (white screen) or closed (black screen). The highest power draw is a 50% gray, shifting to black, going back to gray, ON A CHECKERBOARD pattern, CHANGING every frame. This is the maximum load for the column drivers.

It is true that the new displays are “normally black” so a black screen will draw fractionally less than a white screen.

But does anyone really care.

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