[opendtv] Re: Philips ClearLCD technique for motion sharpness
- From: jeroen.stessen@xxxxxxxxxxx
- To: opendtv@xxxxxxxxxxxxx
- Date: Fri, 21 Jan 2005 17:15:21 +0100
Hi,
I wrote:
>> image retention.
John Golitsis wrote:
> Everybody had thought it impossible on an LCD-based display
Well... not everybody... It is very possible. Even if 30 Hz polarity
inversion is applied then it can still beat with a residu of 30 Hz
line flicker from an imperfect de-interlacer and cause a DC voltage
component on the cell. This then causes some image retention, which
manifests as a 30 Hz flickering after-image, and only goes away after
a long time. Some LCDs are much more sensitive to this than others,
so be careful when supplying your own (cheap) de-interlacer... (PC !)
It is of course not "burn-in" as we know it, i.e. phosphor wear.
It is a change of physical properties of the LC cell by ion transport.
But it can be just as annoying, and nobody knows for sure how long it
takes to fade away. One LCD thermometer in my home is more or less
destroyed because I left it running for too long on an almost empty
battery. That low battery warning was apparently not for nothing !
Regards,
-- Jeroen
+-------------------------------+----------------------------------------+
| From: Jeroen H. Stessen | E-mail: Jeroen.Stessen@xxxxxxxxxxx |
| Building: SFJ-5.22 Eindhoven | PHILIPS Applied Technologies |
| Phone: ++31.40.2732739 | Visiting & mail address: Glaslaan 2 |
| Mobile: ++31.6.44680021 | NL 5616 LW Eindhoven, the Netherlands |
| Pager: ++31.6.65133818 | Website: http://www.pdsl.philips.com/ |
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