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hm. I guess the refresh on the lcd makes the colour it draws irrelevant? And that it's the change on the pixels that take power, mostly?
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Posted: 2007-10-12 16:59:06
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On 2007-10-12 16:59:06, Nipsen wrote:
hm. I guess the refresh on the lcd makes the colour it draws irrelevant? And that it's the change on the pixels that take power, mostly?
what's on the screen has little affect imho. Think about it, when the backlight is off, you can still see the pixels on the screen, they are very dark, so it's the backlight that consumes lot's of energy, not the lcd itself.
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Posted: 2007-10-15 01:46:55
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..yeah, that sounds more right.
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Posted: 2007-10-15 02:15:07
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On 2007-10-15 01:46:55, max_wedge wrote:
On 2007-10-12 16:59:06, Nipsen wrote:
hm. I guess the refresh on the lcd makes the colour it draws irrelevant? And that it's the change on the pixels that take power, mostly?
what's on the screen has little affect imho. Think about it, when the backlight is off, you can still see the pixels on the screen, they are very dark, so it's the backlight that consumes lot's of energy, not the lcd itself.
Thats what i am trying to find out max!
I came to believe that the reason why 16M screens consumes higher battery life was that if we try to analyse 16M LCD it's alot brighter than a 65 or a 256K LCDs. this could be caused by the number of backlight modules installed in that LCD or it could be that the backlight has higher luminiscence(or LUX rating) rating than a backlight in a 65 or 256K LCD ones.
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Posted: 2007-10-15 02:16:28
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I remember there was a study or something i read somewhere recently that found that LCD displays WILL consume more power when the screen is displaying mostly black. So, no, I think a black theme won't help. It might even make things worse.
Can't find the exact link but this guy actually did some measurements and found no difference:
http://blogs.msdn.com/dthorpe[....]03/black-pixels-cost-less.aspx
Reducing your brightness on the other hand makes a huge difference. I'm on 50% and my batt lasts for more than 2 days even with some moderate media playing, web surfing, emailing, games, etc.
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Posted: 2007-10-15 03:00:01
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On 2007-10-15 02:16:28, razec wrote:
I came to believe that the reason why 16M screens consumes higher battery life was that if we try to analyse 16M LCD it's alot brighter than a 65 or a 256K LCDs. this could be caused by the number of backlight modules installed in that LCD or it could be that the backlight has higher luminiscence(or LUX rating) rating than a backlight in a 65 or 256K LCD ones.
yes true. but what I'm getting at, is since the displaying of a pixel hardly uses any power at all (since it's dark when the backlight is off), it's the backlighting itself that consumes power, not the displaying of a pixel. So whether the black or white pixel uses more energy is immaterial since neither uses much enegy at all compared to the backlight.
A 16m display may have stronger backlighting, if this is true then a 16m display will use more power than a 262. But in terms of using black or white on any given display, neither white nor black will make much difference in power consumption.
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Posted: 2007-10-15 04:23:00
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On 2007-10-15 03:00:01, denosha wrote:
I remember there was a study or something i read somewhere recently that found that LCD displays WILL consume more power when the screen is displaying mostly black. So, no, I think a black theme won't help. It might even make things worse.
Can't find the exact link but this guy actually did some measurements and found no difference:
http://blogs.msdn.com/dthorpe[....]03/black-pixels-cost-less.aspx
Reducing your brightness on the other hand makes a huge difference. I'm on 50% and my batt lasts for more than 2 days even with some moderate media playing, web surfing, emailing, games, etc.
agree, and it's the most effective way of saving juice in the battery
Increasing the brightness will decrease the depth of the "blacks" when viewing movies excessive brightness also causes the screen to be washed-out.
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Posted: 2007-10-15 04:30:42
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There is no way the color of the theme can affect the battery life because all an LCD does is either block or let thru light FROM your backlight. So your backlight is on all the time and the black theme just tries to block it out. So you're actually wasting your battery on having the backlight on behind the blocked pixels
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Posted: 2007-10-15 10:53:14
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Wow, what an interesting xyz......... just turn the phones off and save a lot!
Or, one with a P990 can just buy the BST-40 battery as I did and have a much longer lasting power despite of having all the colors and animations and bright screen ON
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Posted: 2007-10-15 17:33:02
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On 2007-10-15 10:53:14, maciekish wrote:
There is no way the color of the theme can affect the battery life because all an LCD does is either block or let thru light FROM your backlight. So your backlight is on all the time and the black theme just tries to block it out. So you're actually wasting your battery on having the backlight on behind the blocked pixels
Sorry but that's not strictly correct. There are certain conditions where the backlight goes off, but the display is still visible. It's very dark, but you can see the icons on the display. The only purpose of the backlight is to illuminate the display better. The display itself still works whether the backlight is on or not.
However you are correct in the sense that the backlight is what uses the lions share of power. Even if there were a difference in black or white colours used on the screen, the backlight uses way more power than the lcd so the backlight is the main cause of power draw.
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Posted: 2007-10-16 02:14:48
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