[opendtv] Re: State of the Art LCD 45" HDTV
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Wed, 27 Oct 2004 19:56:57 -0400
You must have very good eyes. I've usually figured that over 4 screen
heights viewing distance 720p was fine, reserving 1080i/p for less than
that.
But I've been wondering lately if I have to amend that a bit for fixed
pixel displays with well defined pixels and no implicit filtering from
CRT spot beam size. The fixed pixel displays may well create some
artifacts that were not an issue back when the original viewing and
visibility tests were mostly performed.
- Tom
Olivier Houot wrote:
> Recently, I saw a demo of a 1280x720 LCD front projector.
>
> The picture was approximately 2 meters wide (with a cinema aspect
> ratio), and it was not an impressive size at all, i found it wanting
> from this point of view.
> I would certainly feel frustrated if after putting money in a costly
> HDTV setup, i could not get more than that size out of it.
>
> The corner of the store where the display was did not allow me to get as
> far as the screen as i would have liked, yet a rough measurement with my
> steps suggested a distance on the order of 3.5 to 4 meters.
>
> In those conditions, the pixels of the LCD matrix were just at the limit
> of visibility, on the bad side of the limit, meaning i could see them.
> So to me, 1280x720 is not enough.
>
> Some recent european reports consider that 720 is enough for 130 cm
> screens (diagonal), but that beyond that, 1080 should be considered.
> After that (far from scientific) experience, i am tempted to concur .
>
>
> Craig Wrote :
>
>
>>Hmmmmmm.....
>>45" diagonal with 1920 x 1080 resolution. The screen is 4439 inches
>>wide, 22 inches tall which means it has 49 samples per inch.
>>
>>I wonder what viewing distance this display is optimized for?
>>
>>In order to perceive this level of detail, by my calculations, one
>>would need to sit in the range of 4-5 feet from the display.
>>
>>3.3 picture heights would be six feet.
>>
>>Sounds like a great information display for digital signage
>>applications, but overkill for an HDTV display, for which 1280 x 720
>>is ideal for a display of this size when viewed at typical viewing
>>distances 9-11 feet.
>>
>
>
>
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