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Observations on power managementObservations on power managementPosted Nov 24, 2008 20:17 UTC (Mon) by MattPerry (guest, #46341)In reply to: Observations on power management by jwb Parent article: Observations on power management
Can you provide a source to support that statement?
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Observations on power management Posted Nov 24, 2008 20:27 UTC (Mon) by jwb (guest, #15467) [Link]
Here, let me google that for you:
http://techlogg.com/content/view/317/
And I've measured my own monitor as well. If you think about how an LCD works, it's logical that 100% black requires the highest current consumption in the panel.
Observations on power management Posted Nov 25, 2008 1:21 UTC (Tue) by sbergman27 (subscriber, #10767) [Link]
Yep. My 22" measures 26 watts while white and 27 watts while black. (My kill-a-watt only displays in increments of 1 watt.) I had always thought it would be the other way around. But now that I think about it, when a watch battery dies, the display turns all silver and not all black. It takes power to make black.
Backlights Posted Nov 25, 2008 15:30 UTC (Tue) by sladen (subscriber, #27402) [Link] The digital watch you're describing is using a simple LCD display (not a VFD/TFT/LED). If you were to flip the polarising glass over on the watch (more easily done on a household/school calculator) then you will have a display that default to black, with clear (reflected) writing. In a self-illuminated colour TFT display, the bright white backlight is used as a starting point, and selectively blocked out (meaning "black" never looks quite black). Transreflective screens complement the blacklight with reflected incoming light (as with the digital watch/calculator's primary source).
Finally, high-end recent flat-screen displays are now are able to selectively shut-off/tone down the output of the backlight in areas where the image is dark or black; by avoiding producing extra light in the first place, less of that light needs blocking to produce a satisfying black.
OLED? Posted Nov 26, 2008 15:39 UTC (Wed) by dmarti (subscriber, #11625) [Link] I'm saving up for an OLED monitor when those come out (the TV at the Sony store is beautiful). OLED doesn't have a backlight and AFAIK black is off.
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