Optimal Viewing distance

On 18/05/2011 09:04, Andy Burns wrote:
Donwill wrote:


I have a 55" full LED TV

What do you mean by "full LED"?

Full LED as opposed to edge LED.. A better quality picture I'm told.

on which I watch HD and SD. My viewing distance is 3.3 Metres

I hope you don't watch 'Panorama', Jeremy Vine's head would be proper
scary at that size :-)

Oooh it is.

On 20/05/2011 14:49, Dickie Mint wrote:
BBC R&D 1989/9

HDTV displays: subjective effects of scanning standards and domestic
picture sizes

Have they got one on "subjective effects of reduced bit-rates and
domestic picture sizes"?

Andy

Donwill wrote:

On 18/05/2011 09:04, Andy Burns wrote:
Donwill wrote:

I have a 55" full LED TV
What do you mean by "full LED"?
Full LED as opposed to edge LED.. A better quality picture I'm told.

If it adjusts brightness per pixel (or in clumps) then yes, you might
get a better range of contrast in a single picture ... I thought you
might think it was an LED panel, rather than an LCD panel with LED
backlight.

On 20/05/2011 20:39, Andy Burns wrote:

If it adjusts brightness per pixel (or in clumps) then yes, you might
get a better range of contrast in a single picture ... I thought you
might think it was an LED panel, rather than an LCD panel with LED
backlight.


I was advised that sets with variable LED lighting have problems with
bleedthrough when there is a bright area next to a dark one.

Andy.

On 20/05/2011 17:31, Donwill wrote:
On 18/05/2011 16:31, Silk wrote:
On 18/05/2011 08:04, Donwill wrote:
On 17/05/2011 17:49, Dickie Mint wrote:
Which? have produced a viewing distance chart :
http://www.which.co.uk/technology/tv...y/?cmp=em-tech


which (sorry!) may be of interest!

Richard
I have a 55" full LED TV on which I watch HD and SD. My viewing distance
is 3.3 Metres I'm very happy with the result, it's great viewing.
Your chart recommends 5 Metres. I think it's wrong.
Just my opinion.

Is your favourite channel CBeebies?
Sorry never heard of it. What is it?

It's a kids' channel. Everyone knows that kids always sit too close to
the TV. ;-)

On 20/05/2011 20:59, Silk wrote:
On 20/05/2011 17:31, Donwill wrote:
On 18/05/2011 16:31, Silk wrote:
On 18/05/2011 08:04, Donwill wrote:
On 17/05/2011 17:49, Dickie Mint wrote:
Which? have produced a viewing distance chart :
http://www.which.co.uk/technology/tv...y/?cmp=em-tech



which (sorry!) may be of interest!

Richard
I have a 55" full LED TV on which I watch HD and SD. My viewing
distance
is 3.3 Metres I'm very happy with the result, it's great viewing.
Your chart recommends 5 Metres. I think it's wrong.
Just my opinion.

Is your favourite channel CBeebies?
Sorry never heard of it. What is it?

It's a kids' channel. Everyone knows that kids always sit too close to
the TV. ;-)
It takes one to know these things :-)

"Andy Champ" wrote in message
. uk...
On 20/05/2011 20:39, Andy Burns wrote:

If it adjusts brightness per pixel (or in clumps) then yes, you might
get a better range of contrast in a single picture ... I thought you
might think it was an LED panel, rather than an LCD panel with LED
backlight.


I was advised that sets with variable LED lighting have problems with
bleedthrough when there is a bright area next to a dark one.

It's pretty incompetent if they can't make it so that it's never worse than
a normal uniformly lit LED back light TFT.

--

Brian Gregory. (In the UK)

To email me remove the letter vee.

On Wed, 18 May 2011 20:09:45 +0100, Andy Champ
wrote:

On 18/05/2011 08:04, Donwill wrote:
I have a 55" full LED TV on which I watch HD and SD. My viewing distance
is 3.3 Metres I'm very happy with the result, it's great viewing.
Your chart recommends 5 Metres. I think it's wrong.
Just my opinion.
Don

I have a 40 inch unit, and sit a bit over 4M back.

I can see the MPEG artefacts caused by the excessively low bitrate on
some programme types. Although in theory I'd get a better view if I was
closer - not off these transmitters.

This is Freeview BTW; but I've often seen funny looking grass on Sky HD
in pubs when they have the ****** football on...

Drink better beer

Yes it's majorly annoying when they put the HD bitrate down to
helpfully provide the same artefacts you're used to from SD

On 20/05/2011 23:42, Brian Gregory [UK] wrote:
"Andy wrote in message
. uk...
On 20/05/2011 20:39, Andy Burns wrote:

If it adjusts brightness per pixel (or in clumps) then yes, you might
get a better range of contrast in a single picture ... I thought you
might think it was an LED panel, rather than an LCD panel with LED
backlight.


I was advised that sets with variable LED lighting have problems with
bleedthrough when there is a bright area next to a dark one.

It's pretty incompetent if they can't make it so that it's never worse than
a normal uniformly lit LED back light TFT.


The black bit next to the white bit will probably be about the same dark
grey as on an ordinary lit set. But the black bit not next to a white
bit will be a lot darker.

Anyone know if this is a real problem?

Andy

In article ,
Brian Gregory [UK] wrote:

I was advised that sets with variable LED lighting have problems with
bleedthrough when there is a bright area next to a dark one.

It's pretty incompetent if they can't make it so that it's never worse than
a normal uniformly lit LED back light TFT.

Yes, they ought to be able to do better even if there is no blocking
between the areas at all: they just need to calculate the light
intensity behind each pixel, and adjust the pixel opacity accordingly.

-- Richard