Welcome to our peer-to-peer forums, where owners help owners. Need help now? Visit eSupport here.

English Community

ThinkPad NotebooksThinkPad: X Series Tablet and Helix Laptops
All Forum Topics
Options

2 Posts

03-17-2009

Washington, DC

11 Signins

49 Page Views

  • Posts: 2
  • Registered: ‎03-17-2009
  • Location: Washington, DC
  • Views: 49
  • Message 1 of 8

Flickering LED Screen on my X200 Tablet

2009-03-17, 18:20 PM

 I received my X200 Tablet with the Superbright LED screen a few months ago, and I have been suffering from severe eye strain and headaches ever since. I knew my woes had something to do with the display itself but I couldn't quite figure out the exact cause until recently.  Using my cell phone camera, I discovered that the screen was flickering. Because the refresh rate of the cell phone camera is relatively low, it interferes with the flickering on my LCD screen. Through the cell phone camera, the screen appears to have moving dark vertical or horizontal banding (depending on the cell phone orientation).

Through some internet searches and participation at other forums, I discovered that LED displays uses pulse width modulation (PWM) to dim the display. PWM in effect, flickers the screen on and off at variable rates to create the illusion of a dimmer display. In the case of X200 Tablets equipped with LED backlit displays, the screen flickers 100% of the time when on battery even at the highest brightness level. I'm assuming this is to conserve battery but it wreaks havoc on my eyes and sanity. The only time my laptop stops flickering is when it is plugged in and set to the highest brightness. I now find myself constantly seeking an electrical outlet whenever I want to use my laptop even if my battery is fully charged. This really takes away from the convenince of my laptop. Furthermore, it is usually too bright at the highest brightness level unless I am outside or by a sunlit window. My eyes don't ever seem to get a break with this laptop.

Is anyone else experiencing the same issues. Can others confirm the flicker on their LED backlit display using a cell phone camera?   I used the camera on a Samsung cell phone and an iPhone and get the same results.  Is there anything that can be done to stop the flicker?

Reply
Options

2 Posts

03-29-2009

UK

4 Signins

52 Page Views

  • Posts: 2
  • Registered: ‎03-29-2009
  • Location: UK
  • Views: 52
  • Message 2 of 8

Re: Flickering LED Screen on my X200 Tablet

2009-03-29, 11:31 AM

Same here with this x200 LED touch panel.  Thought this issue would not affect me, but after using the machine at half-brightness I start to get some sort of headache which goes away instantly when I turn up the screen brightness to max and set the gamma to very low (software brightness).

 

My previous machine has a higher dpi (smaller dots) and I do not have this issue.  It has a CCFL backlit screen.  This x200 screen flickers at 90Hz which a percentage of the population do react to.  Why doesn't Lenovo QA these sort of 'human issues' as we are paying quite a high price for these machines?  And no, here in the UK we are fixed to one single non-configurable x200 tablet.  There are NO hardware options, so we cannot order a CCFL non-touch screen. 

 

It would be very nice if Lenovo could replace my panel with a non-touch CCFL version to allow me to use the machine at lower than full brightness without getting headaches.

Reply
Options

2 Posts

03-29-2009

UK

4 Signins

52 Page Views

  • Posts: 2
  • Registered: ‎03-29-2009
  • Location: UK
  • Views: 52
  • Message 3 of 8

Re: Flickering LED Screen on my X200 Tablet

2009-03-29, 11:35 AM

Here's a link to this issue on the 'other' X-series tablet forum:

  http://forum.tabletpcreview.com/showthread.php?t=22598

Reply
Options

2 Posts

05-18-2009

USA

3 Signins

12 Page Views

  • Posts: 2
  • Registered: ‎05-18-2009
  • Location: USA
  • Views: 12
  • Message 4 of 8

Re: Flickering LED Screen on my X200 Tablet

2009-05-18, 7:10 AM

I have something new to report for how to get rid of the flickering whenever the tablet is unplugged. Go into the Intel Graphics Properties (for the onboard graphics). Go to Display Settings->Power Settings->Modify Settings->and turn off "Intel(R) Display Power Saving Technology"

This will eliminate the flicker while unplugged (and at maximum brightness). Happy computing!

 

PS The 90Hz PWM frequency you guys built into this thing is way too low. Don't make your customers sick!

Reply
Options

7 Posts

06-02-2009

UK

149 Signins

449 Page Views

  • Posts: 7
  • Registered: ‎06-02-2009
  • Location: UK
  • Views: 449
  • Message 5 of 8

Re: Flickering LED Screen on my X200 Tablet

2009-07-31, 17:52 PM
Same here with my x200 Tablet. Cause my serious eye strain and headache. Any further solution for this problem now?
Message Edited by benny0060 on 07-31-2009 07:49 PM
Reply
Options

1 Posts

11-13-2009

Belfast

1 Signins

11 Page Views

  • Posts: 1
  • Registered: ‎11-13-2009
  • Location: Belfast
  • Views: 11
  • Message 6 of 8

Re: Flickering LED Screen on my X200 Tablet

2009-11-13, 17:00 PM

All computer screens flicker, usually too fast for the naked eye to notice. If you use a camera (like on your mobile/cellphone) you're able to pick this up but that's the case on any computer or TV screen. However, mine screen wobbles occasionally like jelly, no headaches, just irritating.

Reply
Options

2 Posts

05-18-2009

USA

3 Signins

12 Page Views

  • Posts: 2
  • Registered: ‎05-18-2009
  • Location: USA
  • Views: 12
  • Message 7 of 8

Re: Flickering LED Screen on my X200 Tablet

2009-11-13, 19:43 PM

Well, in this case, that's not true. If you put the X200 on maximum brightness and make the adjustment to intel power management above, it will not flicker at all, and you can verify this with your digital camera. If you use a lower brightness you will see the PWM on your digitial viewfinder. It makes a huge eyestrain difference.

Reply
Options

9380 Posts

11-27-2007

Slovakia

15518 Signins

2040239 Page Views

  • Posts: 9380
  • Registered: ‎11-27-2007
  • Location: Slovakia
  • Views: 2040239
  • Message 8 of 8

Re: Flickering LED Screen on my X200 Tablet

2012-04-30, 16:20 PM

Andy  

______________________________________


Please remember to come back and mark the post that you feel solved your question as the solution, it earns the member + points

Did you find a post helpfull? You can thank the member by clicking on the star to the left awarding them Kudos

Please add your type, model number and OS to your signature, it helps to help you.

Forum Search Option T430 2347-G7U W8 x64, Yoga 10 HD+, Tablet 1838-2BG, T61p 6460-67G W7 x64, T43p 2668-G2G XP, T23 2647-9LG XP, plus a few more.

FYI Unsolicited Personal Messages will be ignored.

de.gif  Deutsche Community   es.gif  Comunidad en Español  uk.gif  English Community ru.gif Русскоязычное Сообщество

PepperonI blog 

Reply
Forum Home

Community Guidelines

Please review our Guidelines before posting.

Learn More

Check out current deals!

Go Shop
X

Save

X

Delete

X

No, I don’t want to share ideas Yes, I agree to these terms

Most Liked Authors

(Last 7 days)

View All