[opendtv] Re: Philips ClearLCD technique for motion sharpness
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Fri, 21 Jan 2005 08:44:42 -0500
Anybody know if 72p looks any better than 60p? Can people see the
difference?
And on a non-blinking fixed pixel display without any fancy rate
conversion, does displaying at 72p look any better than at 24p or 48p?
And is it hard to make a 60p LCD that could also handle 24p? I thought
some of them could.
Just curious.
- Tom
Craig Birkmaier wrote:
> At 5:22 PM +0100 1/20/05, jeroen.stessen@xxxxxxxxxxx wrote:
>
>>It's not about the "chips", it's about the row and column drivers
>>and especially the TFT switches on the panel. If you try to drive
>>them too fast then there will be all sorts of image artefacts.
>>Worse: these artefacts may show up (or increase) over time.
>>So it takes more than just faster silicon to increase the speed.
>>The developments are going the right way, but they can also be used
>>for making larger screens. Just not for both at the same time...
>
>
> Why not improve the on-board pipes to make it possible to refresh all
> pixels at the same time instead of using scanning techniques? Just
> curious.
>
>
>>I thought that you proposed to erase some magic numbers from the
>>standards in order to allow arbitrary frame rates. I warn against
>>that because I know that there are LCD panels that will work at
>>ONLY 60 Hz. Same with PDPs, they are really optimized for only 1
>>or 2 frame rates. Your own DLP RPTV might even have this feature...
>>
>
>
> There are no magic numbers Jeroen. The display is decoupled from the
> source. It is the job of the local image processor to scale the
> source to meet the needs of the attached display.
>
> I agree that this could lead to formats that exceed the capabilities
> of some displays. But this is ALREADY true, as we now sell displays
> with SD, EDTV and HD resolutions, and expect the source from all of
> these formats to be presented properly on ALL display types and
> resolutions.
>
> If we do move to frame rates higher than 60 Hz, you can do temporal
> downsampling. Either cheap and dirty by dropping frames, or more
> expensive using a frame rate processor like True Motion.
>
> Regards
> Craig
>
>
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