or Connect
AppleInsider › Forums › Mobile › iPad › Tech behind new iPad's color quality attributed to 30% increase in power usage
New Posts  All Forums:Forum Nav:

Tech behind new iPad's color quality attributed to 30% increase in power usage

post #1 of 43
Thread Starter 
A study released on Thursday estimates that the technology used in the iPad's Retina Display consumes 20-30 percent more power to attain Apple's claimed 44 percent improvement in color saturation over the iPad 2.

According to results from a series of tests conducted by display-centric blog dot color, the new Retina Display iPad utilizes advanced filters to improve color reproduction, which forced Apple to bump the output of the tablet's backlight LEDs to maintain a brightness comparable to previous models.

A problem with all LCD displays is unwanted light leakage which translates to inaccurate color reproduction and lower saturation. To solve the problem and improve an LCD screen's range of color, or color gamut, display makers can either boost the performance of backlight LEDs or implement higher quality filters. In both cases the goal is to represent the primary colors, red, green and blue, as purely as possible since these three hues are mixed to create a display's color spectrum.

Based on the test's measurements, Apple chose to concentrate on upgrading the filters used in the Retina Display to more accurately reproduce the primary colors. The new technology resulted in a spike in power consumption, however, because the improved filters let less light through than inefficient versions. This is to be expected, as high quality filters are narrower by design in order to block out unwanted light bands.

The spectrum graph below was taken from a white screen on both the iPad 2 and third-generation iPad in which all primary color are switched on. Reading the results show that the Retina Display features a significant peak at the 450 nanometer wavelength without much change in shape, meaning that the brightness of the color blue has been boosted.


Source| dot color


When the same spectrum measurements are taken with only blue sub-pixels open, the same peak can be seen, however there is also a slight bump at around 540 nanometers. This small peak means that iPad displays leaks a certain amount of green light when displaying "blue" colors.


Source: dot color


What can be seen from this blue-pixel-only chart is that the new iPad allows less green light to pass through the filter which translates into a purer blue.


The iPad 2's display (left) shows a slightly aqua tinge when compared to the new iPad's Retina Display (right) | Source: dot color


As a result of the enhanced color, less light is getting through the improved filters and thus more LEDs or more powerful units are needed to compensate. By dot color estimates, this relates to a 20-30 percent increase in power consumption which is most likely one of the main reasons why the new iPad sports a massive 42.5-watt-hour battery.

[ View article on AppleInsider ]
post #2 of 43
Quote:
"...unwanted leakage of unwanted light..."

Editor!

Proud AAPL stock owner.

 

GOA

Reply

Proud AAPL stock owner.

 

GOA

Reply
post #3 of 43
No way to turn this feature on or off? Most of the time I would rather have 30% longer battery life.
post #4 of 43
Quote:
Originally Posted by ch2co View Post

No way to turn this feature on or off? Most of the time I would rather have 30% longer battery life.

1) No, but you can reduce your backlight brightness, turn off unneeded radios, and use paid apps that don't have ads.

2) This doesn't mean 30% longer battery life as we're talking about the power usage of the display, not the GPU, not the CPU, the backlight, or anything else.

"The real haunted empire?  It's the New York Times." ~SockRolid

"There is no rule that says the best phones must have the largest screen." ~RoundaboutNow

Reply

"The real haunted empire?  It's the New York Times." ~SockRolid

"There is no rule that says the best phones must have the largest screen." ~RoundaboutNow

Reply
post #5 of 43
Quote:
Originally Posted by SpamSandwich View Post

Editor!

But maybe there's also wanted leakage of unwanted light, wanted leakage of wanted light, and unwanted leakage of wanted light. He's just making sure we know what kind is leaking.

Originally posted by Marvin

Even if [the 5.5” iPhone] exists, it doesn’t deserve to.
Reply

Originally posted by Marvin

Even if [the 5.5” iPhone] exists, it doesn’t deserve to.
Reply
post #6 of 43
It's just not normal, my iPad is dropping about 14% battery power in like 30 minutes.
post #7 of 43
Quote:
Originally Posted by WardC View Post

It's just not normal, my iPad is dropping about 14% battery power in like 30 minutes.

Post hoc, ergo propter hoc.

"The real haunted empire?  It's the New York Times." ~SockRolid

"There is no rule that says the best phones must have the largest screen." ~RoundaboutNow

Reply

"The real haunted empire?  It's the New York Times." ~SockRolid

"There is no rule that says the best phones must have the largest screen." ~RoundaboutNow

Reply
post #8 of 43
Quote:
Originally Posted by SolipsismX View Post

Post hoc, ergo propter hoc.

Consumer Reports will say, "we cannot recommend the new iPad because the improved color on the retina display uses 30% more power and despite the larger battery, it is not Android enough to recommend."

"Apple should pull the plug on the iPhone."

John C. Dvorak, 2007
Reply

"Apple should pull the plug on the iPhone."

John C. Dvorak, 2007
Reply
post #9 of 43
Quote:
Originally Posted by SolipsismX View Post

Post hoc, ergo propter hoc.

Proud AAPL stock owner.

 

GOA

Reply

Proud AAPL stock owner.

 

GOA

Reply
post #10 of 43
Quote:
Originally Posted by WardC View Post

It's just not normal, my iPad is dropping about 14% battery power in like 30 minutes.

I read somewhere that there may be a problem with the battery indicator displaying an incorrect charge level -- showing 100% charged when, actually, not fully charged.

One thing to try is charge the new iPad with a standalone charger... then when it shows 100%, monitor the temperature of the charger. If it stays warm, it indicates that the battery is still being charged (it isn't really at full charge).
"Swift generally gets you to the right way much quicker."
-auxio-
Reply
"Swift generally gets you to the right way much quicker."
-auxio-
Reply
post #11 of 43
Colorgate, Chargegate, Heatgate... CRgate!

Edit: Ooooops... almost forgot Envygate!
"Swift generally gets you to the right way much quicker."
-auxio-
Reply
"Swift generally gets you to the right way much quicker."
-auxio-
Reply
post #12 of 43
Quote:
Originally Posted by Dick Applebaum View Post

I read somewhere that there may be a problem with the battery indicator displaying an incorrect charge level -- showing 100% charged when, actually, not fully charged.

One thing to try is charge the new iPad with a standalone charger... then when it shows 100%, monitor the temperature of the charger. If it stays warm, it indicates that the battery is still being charged (it isn't really at full charge).


From what I read it can take up an hour after it says 100% to actually be fully charged. Hopefully AnandTech will tackle this issue with precision in their thorough iPad (3) review.

"The real haunted empire?  It's the New York Times." ~SockRolid

"There is no rule that says the best phones must have the largest screen." ~RoundaboutNow

Reply

"The real haunted empire?  It's the New York Times." ~SockRolid

"There is no rule that says the best phones must have the largest screen." ~RoundaboutNow

Reply
post #13 of 43
OT, but related to the recent AI threads on Windows 8 / Metro:

If Windows 7 "Simplifies" the PC, What Does Windows 8 Do to It?

Quote:
When I asked why Metro apps couldn't share the Taskbar with the other Desktop apps, the response I got was that the Taskbar would not always be on-screen. Why wouldn't it be on-screen all the time? Because sometimes you'd be running a Metro-style app.

Quote:
In Windows 8, there are quite a few surprisingly detailed procedures for doing things that accomplish nothing whatsoever, this being one of them.

An interesting read by a pro Windows guy!
"Swift generally gets you to the right way much quicker."
-auxio-
Reply
"Swift generally gets you to the right way much quicker."
-auxio-
Reply
post #14 of 43
SUPER interesting article. Idk about you guys, but I am still drooling at my retina display wallpaper on my home screen. I'll give up " longer battery life" for the improved spectrum of colors. It looks like lit up paper pretty much. SUPER sweet!!!
"Being in power is like being a lady. If you have to tell people you are, you aren't." - Margaret Thatcher
Reply
"Being in power is like being a lady. If you have to tell people you are, you aren't." - Margaret Thatcher
Reply
post #15 of 43
It's ironic that I'm viewing this thread on my iPad.
post #16 of 43
My new iPad screen looks freaking amazing! It's the best screen out there, with very accurate colors and it's also super sharp of course. It's the best screen that I have, out of all my monitors.

I am not a filthy treehugger and I don't mind using more power for a vastly improved viewing experience. Having characters where you can't make out the pixels when reading is definitely worth any increased power usage.

I suggest that Apple makes two versions of the next iPad, one for demanding users and for people who want and expect the best. The other version will be for people with poor eyesight and people with shitty standards. Hell, just make the display 64 x 64 pixels, that ought to save a whole shitload of power. Actually, scrap that. Apple does not need to make any low quality, shitty products, their competitors already have that area covered.
post #17 of 43
Quote:
Originally Posted by Dick Applebaum View Post

Colorgate, Chargegate, Heatgate... CRgate!

Edit: Ooooops... almost forgot Envygate!

What about SelloutGate! That's the only gate that matters, IMO.
post #18 of 43
Quote:
Originally Posted by Apple ][ View Post

My new iPad screen looks freaking amazing! It's the best screen out there, with very accurate colors and it's also super sharp of course. It's the best screen that I have, out of all my monitors.

I am not a filthy treehugger and I don't mind using more power for a vastly improved viewing experience. Having characters where you can't make out the pixels when reading is definitely worth any increased power usage.

I suggest that Apple makes two versions of the next iPad, one for demanding users and for people who want and expect the best. The other version will be for people with poor eyesight and people with shitty standards. Hell, just make the display 64 x 64 pixels, that ought to save a whole shitload of power.

...Anything less than 77 x 77 is totally unacceptable

or this:



or this:

"Swift generally gets you to the right way much quicker."
-auxio-
Reply
"Swift generally gets you to the right way much quicker."
-auxio-
Reply
post #19 of 43
Quote:
Originally Posted by ch2co View Post

No way to turn this feature on or off? Most of the time I would rather have 30% longer battery life.

Seriously this is the same as any other lighted device, more brightness means more power.
post #20 of 43
Quote:
Originally Posted by ch2co View Post

No way to turn this feature on or off? Most of the time I would rather have 30% longer battery life.

Yep, just hit settings, general, then you have to draw three figure 8 patterns on the screen which will unlock the easter-egg that will reveal the video quality settings.

My battery life went up by like 8 hours! Crazy!
post #21 of 43
I am very satisfied with my all day iPad battery life. It was actually over 50% last night when I plugged it in at bed time.
post #22 of 43
Reading some of the posts on the apple centric blog sites seems to highlight the worldwide problem that I like to call early adopters (or most likely, jealous bastard can't afford one so will make shit up about it) munchausen's syndrome.

Typified by comments such as:

It overheats and I can fry eggs on it
There are hundreds of dead pixels
It's yellow
It's pink
Light bleeds
The battery runs out in 5 minutes
The wifi reception seems weaker
it uses more data
Etc etc.
post #23 of 43
My wife and I have been using our iPads all week, hers is an iPad (1st) mine is the (3rd) and with about the same usage both seem to be about the same with the new iPad with a little lower battery life at the end of the evening.

the real test for me is watching movies on the plane, my average flight is 5 to 6 hours and I watch movies the entire time.
Mac Book Pro (late 2008), Power Mac G5(upgraded to Intel Hackintosh), new iPad 64GB 4G LTE, iPad Mini, iPhone 5.
Reply
Mac Book Pro (late 2008), Power Mac G5(upgraded to Intel Hackintosh), new iPad 64GB 4G LTE, iPad Mini, iPhone 5.
Reply
post #24 of 43
I'm going to head over to a nearby Apple store to compare iPad 3 screens. Mine is a bit warmer than I'd like and if I don't hold it just right, the viewing angle amplifies this effect. I'll be comparing brightness and coolness.

Also, I read an interesting article in the WSJ explaining that some apps (such as the WSJ) use a custom font that will appear fuzzy on the new iPad 3. They are working on an update to fix this issue.
post #25 of 43
Quote:
Originally Posted by bugsnw View Post

I'm going to head over to a nearby Apple store to compare iPad 3 screens. Mine is a bit warmer than I'd like and if I don't hold it just right, the viewing angle amplifies this effect. I'll be comparing brightness and coolness.

Also, I read an interesting article in the WSJ explaining that some apps (such as the WSJ) use a custom font that will appear fuzzy on the new iPad 3. They are working on an update to fix this issue.

Most all fonts and graphics on iPad apps that had not been updated are fuzzy. Even the apple insider logos and graphics show the same amount of blur. Call it the curse of the early adopters, but it can be quite annoying!
post #26 of 43
So this thing is not only super HD, it has pro level color reproduction? Excuse me while I go sync my photos on to it.
post #27 of 43
Quote:
Originally Posted by SolipsismX View Post

...This doesn't mean 30% longer battery life as we're talking about the power usage of the display, not the GPU, not the CPU, the backlight [SIC], or anything else.

From TFA: ... less light is getting through the improved filters and thus more LEDs or more powerful units are needed to compensate...

IOW, it is the backlight. Filters consume no power. You simply need more light to get through them, which is one of the reasons why an iPad (3) has twice as many LEDs in the display.

You also need more LEDs because the pixels are smaller, and more space in the display is dedicated to control runs.
post #28 of 43
Quote:
Originally Posted by wizard69 View Post

Seriously this is the same as any other lighted device, more brightness means more power.

Yes, yes, it's common sense. But it's happening in an Apple device, which makes it a scandal.

"Apple should pull the plug on the iPhone."

John C. Dvorak, 2007
Reply

"Apple should pull the plug on the iPhone."

John C. Dvorak, 2007
Reply
post #29 of 43
Quote:
Originally Posted by Rmb0037 View Post

SUPER interesting article. Idk about you guys, but I am still drooling at my retina display wallpaper on my home screen. I'll give up " longer battery life" for the improved spectrum of colors. It looks like lit up paper pretty much. SUPER sweet!!!

No kidding! I LOVELOVELOVELOVELOVE my new and first iPad! I have not compared it to an iPad 2 display yet so I am very spoiled. I can't get over how much I LOVE this thing.




LOVE
post #30 of 43
I do notice a dead black pixel on the bottom 1/6th of the display in the center. Its noticable when i am looking for it and it appears to be a piece of dust that cannot be removed. This is not a huge problem for me, but I would like to know if others are experiencing this also. I will try to massage it out and keep you guys updated.
post #31 of 43
Quote:
Originally Posted by tyler82 View Post

No kidding! I LOVELOVELOVELOVELOVE my new and first iPad! I have not compared it to an iPad 2 display yet so I am very spoiled. I can't get over how much I LOVE this thing.

LOVE

You're suppose to buy Apple products and then hate then hate them this way people know you're objective.


Quote:
Originally Posted by tyler82 View Post

I do notice a dead black pixel on the bottom 1/6th of the display in the center. Its noticable when i am looking for it and it appears to be a piece of dust that cannot be removed. This is not a huge problem for me, but I would like to know if others are experiencing this also. I will try to massage it out and keep you guys updated.

I'm thinking it's dust because a single pixel would be very hard to see. I would get a rereplacement ASAP.

"The real haunted empire?  It's the New York Times." ~SockRolid

"There is no rule that says the best phones must have the largest screen." ~RoundaboutNow

Reply

"The real haunted empire?  It's the New York Times." ~SockRolid

"There is no rule that says the best phones must have the largest screen." ~RoundaboutNow

Reply
post #32 of 43
Quote:
Originally Posted by tyler82 View Post

I do notice a dead black pixel on the bottom 1/6th of the display in the center. Its noticable when i am looking for it and it appears to be a piece of dust that cannot be removed. This is not a huge problem for me, but I would like to know if others are experiencing this also. I will try to massage it out and keep you guys updated.

I had a dead pixel in the same place! What I did was pick at it for a few minutes with a sharp tweezer and eventually I fixed it! Let me know if that works for you.
post #33 of 43
Quote:
Originally Posted by SolipsismX View Post

You're suppose to buy Apple products and then hate then hate them this way people know you're objective.



I'm thinking it's dust because a single pixel would be very hard to see. I would get a rereplacement ASAP.

It does look like a piece of dust. So Apple will replace it no questions asked? What I be able to upgrade to the 64 GB model if they're going to replace it anyway, if I were to pay the additional cost?
post #34 of 43
Quote:
Originally Posted by cameronj View Post

I had a dead pixel in the same place! What I did was pick at it for a few minutes with a sharp tweezer and eventually I fixed it! Let me know if that works for you.

post #35 of 43
Quote:
Originally Posted by cameronj View Post

I had a dead pixel in the same place! What I did was pick at it for a few minutes with a sharp tweezer and eventually I fixed it! Let me know if that works for you.

Is it okay to use your masturbation tweezers for this task?


Quote:
Originally Posted by tyler82 View Post

It does look like a piece of dust. So Apple will replace it no questions asked?

Sure. Remember that you have 2 weeks (at least in the US) to return the device for a full refund without a restocking fee so if they won't you could always go that route... but because they have that policy they won't.

I dropped my iPad 2, twice, breaking the glass both times my fault and they replaced them for free so I am sure a factory defect that reduces the user experience is something they will cover.

"The real haunted empire?  It's the New York Times." ~SockRolid

"There is no rule that says the best phones must have the largest screen." ~RoundaboutNow

Reply

"The real haunted empire?  It's the New York Times." ~SockRolid

"There is no rule that says the best phones must have the largest screen." ~RoundaboutNow

Reply
post #36 of 43
Quote:
Originally Posted by tyler82 View Post


Try it, it worked!
post #37 of 43
Quote:
Originally Posted by cameronj View Post

Try it, it worked!

Are you being serious? How is he suppose to get tweezers under the glass to get to the dust?

"The real haunted empire?  It's the New York Times." ~SockRolid

"There is no rule that says the best phones must have the largest screen." ~RoundaboutNow

Reply

"The real haunted empire?  It's the New York Times." ~SockRolid

"There is no rule that says the best phones must have the largest screen." ~RoundaboutNow

Reply
post #38 of 43
Quote:
Originally Posted by SolipsismX View Post

Are you being serious? How is he suppose to get tweezers under the glass to get to the dust?

You can sometimes unstick stuck pixels by tapping on the glass. I doubt there's actually dust under the screen, that's just what stuck pixels look like at very high res.
post #39 of 43
Quote:
Originally Posted by ch2co View Post

No way to turn this feature on or off? Most of the time I would rather have 30% longer battery life.

Heck no. I breathe every watt of pure Retina rich-coloured goodness.
post #40 of 43
Quote:
Originally Posted by cameronj View Post

Yep, just hit settings, general, then you have to draw three figure 8 patterns on the screen which will unlock the easter-egg that will reveal the video quality settings.

My battery life went up by like 8 hours! Crazy!

Yeah that turns off the 3.5 out of 4 cores of GPU so you're only running at half a core, and de-Retinises the display to run at 640x480 pixels. It also turns on a small mass effect field to make the battery have 10% more mass in the same space. You can tell where my mind is at. Carry on.
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: iPad
  • Tech behind new iPad's color quality attributed to 30% increase in power usage
AppleInsider › Forums › Mobile › iPad › Tech behind new iPad's color quality attributed to 30% increase in power usage