Register Guidelines E-Books Search Today's Posts Mark Forums Read

Go Back   MobileRead Forums > E-Book Readers > Barnes & Noble NOOK > Nook Color & Nook Tablet

Notices

Reply
 
Thread Tools Search this Thread
Old 11-28-2010, 10:20 PM   #1
Ericejs
Member
Ericejs began at the beginning.
 
Posts: 10
Karma: 10
Join Date: Nov 2010
Device: None
Screen flicker on nook color? Defect??

I have noticed that when at about 25-40% brightness you can notice a little screen flicker from the brightness on dark backgrounds. For instant if you use night mode at about 30% there is a noticeable flicker on the screen, not real intense, but still noticeable (changing the brightness higher or page color makes it go away). Is this a defect? Does this happen to anyone else? I wonder if I need a replacement It seems to happen on any dark background, not on pure white.. any ideas?
Ericejs is offline   Reply With Quote
Old 11-28-2010, 10:51 PM   #2
LoganK
Groupie
LoganK can name that song in three notesLoganK can name that song in three notesLoganK can name that song in three notesLoganK can name that song in three notesLoganK can name that song in three notesLoganK can name that song in three notesLoganK can name that song in three notesLoganK can name that song in three notesLoganK can name that song in three notesLoganK can name that song in three notesLoganK can name that song in three notes
 
Posts: 196
Karma: 24918
Join Date: May 2009
Device: PRS-505,nook,Nook Color,Android
Quote:
Originally Posted by Ericejs View Post
I have noticed that when at about 25-40% brightness you can notice a little screen flicker from the brightness on dark backgrounds. For instant if you use night mode at about 30% there is a noticeable flicker on the screen, not real intense, but still noticeable (changing the brightness higher or page color makes it go away). Is this a defect?
It can depend a lot on your reading conditions: incandescent or fluorescent light, brightness of room, angle of display, whether you are looking directly at the device or merely catching it in your peripheral vision. I tend to be moderately sensitive to such flickering, and I have not noticed any issues with the Nook Color.

I would suggest showing your device to a friend and ask them what they see before labeling it a defect. Also, and I know this sounds unlikely, but rebooting it may effect some change.

For those that are curious, this flickering is generally due to the use of Pulse Width Modulation (PWM) in the brightness control. It is usually flickering at a rate too fast for humans to notice, but that isn't always the case (I'm looking at you Cadillac brake lights).
LoganK is offline   Reply With Quote
Old 11-28-2010, 11:01 PM   #3
Ericejs
Member
Ericejs began at the beginning.
 
Posts: 10
Karma: 10
Join Date: Nov 2010
Device: None
very interesting, thanks for the reply.... It doesn't bother me too much since i doesn't seem to be noticeable on every background (such as normal or sepia) but is noticeable on darker things with the brightness around 30%....when I make the brightness higher I cant notice it at all. Also can't notice it at 0%.
Ericejs is offline   Reply With Quote
Old 12-07-2010, 12:22 PM   #4
cwosigns
Member
cwosigns began at the beginning.
 
Posts: 12
Karma: 10
Join Date: Nov 2010
Location: Columbus, Ohio
Device: NookColor/Droid Incredible
Same issue here. I'll try to exchange for a different one.
cwosigns is offline   Reply With Quote
Old 12-07-2010, 12:44 PM   #5
boswd
Banned
boswd ought to be getting tired of karma fortunes by now.boswd ought to be getting tired of karma fortunes by now.boswd ought to be getting tired of karma fortunes by now.boswd ought to be getting tired of karma fortunes by now.boswd ought to be getting tired of karma fortunes by now.boswd ought to be getting tired of karma fortunes by now.boswd ought to be getting tired of karma fortunes by now.boswd ought to be getting tired of karma fortunes by now.boswd ought to be getting tired of karma fortunes by now.boswd ought to be getting tired of karma fortunes by now.boswd ought to be getting tired of karma fortunes by now.
 
Posts: 2,391
Karma: 1001781
Join Date: May 2010
Device: The Nook, Nook color and Droid X
What LoganK wrote is absolutley correct. From what I've read it's an LED backlit thing, should be mostly undetacable under normal conditions.

I tried seeing it under my work lights which are flourescent and couldn't see any flickering,

but I have read around of other LED monitors and such where people have noticed some faint flickering when brightness was turned down pretty low.

Last edited by boswd; 12-07-2010 at 01:25 PM.
boswd is offline   Reply With Quote
Old 12-15-2010, 06:44 PM   #6
GreenMonkey
DRM hater
GreenMonkey ought to be getting tired of karma fortunes by now.GreenMonkey ought to be getting tired of karma fortunes by now.GreenMonkey ought to be getting tired of karma fortunes by now.GreenMonkey ought to be getting tired of karma fortunes by now.GreenMonkey ought to be getting tired of karma fortunes by now.GreenMonkey ought to be getting tired of karma fortunes by now.GreenMonkey ought to be getting tired of karma fortunes by now.GreenMonkey ought to be getting tired of karma fortunes by now.GreenMonkey ought to be getting tired of karma fortunes by now.GreenMonkey ought to be getting tired of karma fortunes by now.GreenMonkey ought to be getting tired of karma fortunes by now.
 
GreenMonkey's Avatar
 
Posts: 877
Karma: 2008318
Join Date: Jun 2010
Location: Michigan
Device: Nook ST glow, Nexus 7 (2013). Wife Kindle Paperwhite, Nexus 7 (2013)
I took mine back to B&N today to see if replacing it would fix it. Both store displays didn't have any flicker.

They opened two different nooks and they did the same flickering thing.

So I called Nook technical support. He put me on hold for about 5 minutes. He said he checked about 5 nooks and they all flickered. But he hadn't noticed it before.

So, he will put a ticket into the development team to have it looked at.

So, another confirmation that Nook tech support is aware and looking into it. Some others have said something similiar over at xda developers forum.
GreenMonkey is offline   Reply With Quote
Old 12-15-2010, 09:03 PM   #7
Ericejs
Member
Ericejs began at the beginning.
 
Posts: 10
Karma: 10
Join Date: Nov 2010
Device: None
Yea I saw that pretty much every NC has this... but not everyone notices it! I have heard it may be possible to fix with an update, I truly hope so!
Ericejs is offline   Reply With Quote
Old 12-15-2010, 09:14 PM   #8
s52m3
Enthusiast
s52m3 began at the beginning.
 
Posts: 28
Karma: 10
Join Date: Nov 2010
Device: none
Ouch now I'm worried as I just ordered one
s52m3 is offline   Reply With Quote
Old 12-15-2010, 09:27 PM   #9
coolbreeze
Addict
coolbreeze plays well with otherscoolbreeze plays well with otherscoolbreeze plays well with otherscoolbreeze plays well with otherscoolbreeze plays well with otherscoolbreeze plays well with otherscoolbreeze plays well with otherscoolbreeze plays well with otherscoolbreeze plays well with otherscoolbreeze plays well with otherscoolbreeze plays well with others
 
Posts: 212
Karma: 2600
Join Date: Oct 2009
Device: Nook Color, White 3G K3
Flickergate!
coolbreeze is offline   Reply With Quote
Old 12-16-2010, 07:18 AM   #10
cwosigns
Member
cwosigns began at the beginning.
 
Posts: 12
Karma: 10
Join Date: Nov 2010
Location: Columbus, Ohio
Device: NookColor/Droid Incredible
I exchanged mine; new one flickers as well. Hope it can be fixed via an update.
cwosigns is offline   Reply With Quote
Old 12-16-2010, 08:44 AM   #11
boswd
Banned
boswd ought to be getting tired of karma fortunes by now.boswd ought to be getting tired of karma fortunes by now.boswd ought to be getting tired of karma fortunes by now.boswd ought to be getting tired of karma fortunes by now.boswd ought to be getting tired of karma fortunes by now.boswd ought to be getting tired of karma fortunes by now.boswd ought to be getting tired of karma fortunes by now.boswd ought to be getting tired of karma fortunes by now.boswd ought to be getting tired of karma fortunes by now.boswd ought to be getting tired of karma fortunes by now.boswd ought to be getting tired of karma fortunes by now.
 
Posts: 2,391
Karma: 1001781
Join Date: May 2010
Device: The Nook, Nook color and Droid X
Quote:
Originally Posted by cwosigns View Post
I exchanged mine; new one flickers as well. Hope it can be fixed via an update.
there is nothing wrong with your nook color.

It's the nature of the LED technology. If you look in the beginning of this thread LoganK provides an accurate explanation. Its post #2 in this thread

the flicker you see should be rather faint and under very low brightness settings with very dark background. The only time I ever see a faint flicker is when I have either very low lighting or pitch dark room and when I hit the main menu arrow that shades the screen.

In it's simpliest terms it's the nature of how LED refreshes, similiar to the old CRT monitor's. Do you remember when the brightness was on too low or you had the lights off you could see a faint flicker? Same idea here.

The reason for the use of LED besides better power consumption is LED's tend to render the best and most accurate color reproduction and deeper blacks.

I find it to a non issue and don't even see any under normal reading conditions and like I said before even in low light and dark setting I only see it when the menu arrow is pressed. and even then its faint. I have my brightness at roughly 20% to maybe 30%

There is a reason you don't see this brought up in any of the professional reviews, simply because it's the nature of the technology.

but if are overly sensitive to it, try raising the brightness up a notch or two, that should help.

Last edited by boswd; 12-16-2010 at 09:06 AM.
boswd is offline   Reply With Quote
Old 12-17-2010, 03:59 AM   #12
GreenMonkey
DRM hater
GreenMonkey ought to be getting tired of karma fortunes by now.GreenMonkey ought to be getting tired of karma fortunes by now.GreenMonkey ought to be getting tired of karma fortunes by now.GreenMonkey ought to be getting tired of karma fortunes by now.GreenMonkey ought to be getting tired of karma fortunes by now.GreenMonkey ought to be getting tired of karma fortunes by now.GreenMonkey ought to be getting tired of karma fortunes by now.GreenMonkey ought to be getting tired of karma fortunes by now.GreenMonkey ought to be getting tired of karma fortunes by now.GreenMonkey ought to be getting tired of karma fortunes by now.GreenMonkey ought to be getting tired of karma fortunes by now.
 
GreenMonkey's Avatar
 
Posts: 877
Karma: 2008318
Join Date: Jun 2010
Location: Michigan
Device: Nook ST glow, Nexus 7 (2013). Wife Kindle Paperwhite, Nexus 7 (2013)
Quote:
Originally Posted by boswd View Post
there is nothing wrong with your nook color.

It's the nature of the LED technology. If you look in the beginning of this thread LoganK provides an accurate explanation. Its post #2 in this thread....
No, this flicker is a lot more than that. Everyone I took it around to could see it, from about 30% - 80% brightness.

The 2 store displays did NOT display the same flicker. Others at xda went through 3-4 units to get one that didn't have the same flicker / distortion.
GreenMonkey is offline   Reply With Quote
Old 12-17-2010, 06:01 AM   #13
donovan1983
Member
donovan1983 ought to be getting tired of karma fortunes by now.donovan1983 ought to be getting tired of karma fortunes by now.donovan1983 ought to be getting tired of karma fortunes by now.donovan1983 ought to be getting tired of karma fortunes by now.donovan1983 ought to be getting tired of karma fortunes by now.donovan1983 ought to be getting tired of karma fortunes by now.donovan1983 ought to be getting tired of karma fortunes by now.donovan1983 ought to be getting tired of karma fortunes by now.donovan1983 ought to be getting tired of karma fortunes by now.donovan1983 ought to be getting tired of karma fortunes by now.donovan1983 ought to be getting tired of karma fortunes by now.
 
Posts: 23
Karma: 475310
Join Date: Dec 2009
Location: Denver, CO
Device: Kindle Paperwhite, Samsung Galaxy Note II, Sony PRS-300
Mine has a slight flicker but nothing nearly as bad as my old Sony CLIE SJ30. That thing, despite its otherwise amazing (for the time) display, had a backlight that looked like a florescent bulb with a bad ballast on nearly anything but the highest brightness. I expect flicker with LEDs since they just don't have that great of a brightness range and I tend to crank the brightness down on nearly all my portable color LCD electronics. My iPhone 3G S (and its warranty replacement), Sony PSP-3000, as well as my BlackBerry 8530 also exhibit similar slight flicker. The NOOKcolor is better than any of them, especially the iPhone 3G S, so I have no real complaints.
donovan1983 is offline   Reply With Quote
Old 12-27-2010, 05:35 PM   #14
EveryMan279
Junior Member
EveryMan279 began at the beginning.
 
Posts: 1
Karma: 10
Join Date: Dec 2010
Device: Nook Color
I got a Nook Color for Christmas and also noticed the flicker you describe too. I went to Barnes and Noble and there were 2 demos setup; one flickered and the other didn't. I tried to exchange mine for another, but the first two workers I showed mine to didn't see the flicker under their fluorescent lighting. So, I looked like a nut. A 3rd worker got involved and he believed me. He explained the phenomenon as a refresh rate issue that was normal. So, now I have a choice to make; try to exchange it at another store or live with it... What to do? What to do?
EveryMan279 is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Nook Color Home Screen and Daily Shelf mad5427 Nook Color & Nook Tablet 23 05-25-2012 05:38 AM
Nook Color: Black Specks on Screen SCION Nook Color & Nook Tablet 16 12-13-2010 10:09 AM
Question re Nook Color screen GA Russell Nook Color & Nook Tablet 7 11-22-2010 03:31 PM
Troubleshooting Got my first Kindle - Screen defect las^se Amazon Kindle 20 11-20-2010 04:18 PM
is this a color screen nook i see? mopping five Nook Color & Nook Tablet 4 10-21-2010 04:08 PM


All times are GMT -4. The time now is 03:59 AM.


MobileRead.com is a privately owned, operated and funded community.