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True HDTV 1080p resolution query


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Old 15-12-2007, 20:30
Demon_Knight
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I see lots of "HD ready" sets on the market and also the higher end that are branded with being able to display full 1080p pictures. But when I dig deeper on some screens the real output resolution is far lower than 1920x1080p pixel resolution so I'm a little wary of what to buy.

Been looking at the following 2 sets. By looking at their pixel's it seems these 2 are true 1920x1080 resolutions. Can someone confirm / deny this please.

http://www.currys.co.uk/martprd/stor...ory_oid=-30633

and

http://www.currys.co.uk/martprd/stor...&category_oid=

Thanks.
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Old 15-12-2007, 21:30
ntlhellworld
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They are both 1080p screens.

Absolutely no point getting a 1080p TV though - have a look at the panasonic plasmas - lower resolutions than LCDs yet produce a far better picture.

-Chris
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Old 15-12-2007, 21:30
Nigel Goodwin
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There are basically two resolutions:

HD Ready - 768 pixels
Full HD - 1080 pixels.

1080 can either be 1080i or 1080P (both the same resolution, but essentially different frame rates), but 1080i is the only broadcast one.

I suspect you're looking at an HD Ready 768 pixel set that will accept a 1080P signal (from Blu-Ray or something) and display it on the 768 pixel screen. Not all HD sets will accept a 1080P signal, not even the Full HD ones - but any 1080P source should be adjustable to 1080i instead.
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Old 16-12-2007, 09:03
bobcar
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They are both 1080p screens.

Absolutely no point getting a 1080p TV though - have a look at the panasonic plasmas - lower resolutions than LCDs yet produce a far better picture.

-Chris
The current Panasonic plasmas are 1080p though even though the PX70 series isn't full HD and there are advantages of 1080p over 1080i. I agree though that the screen resolution isn't the most important point - I have a PX70 in preference to a PZ70 because I feel the SD performance is better.
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Old 17-12-2007, 09:02
CWatters
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There are some TVs that have an LCD panel with 1080 pixels but which don't support 1080p content. They only upscale 720 to 1080. Some TVs don't support 1080p on all of their HDMI inputs.

Not exactly full marks for either..

http://www.hdtvtest.co.uk/LG-42LF65/

http://www.hdtvtest.co.uk/Samsung-LE40M86BD/
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Old 17-12-2007, 12:59
paulr2006
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There are some TVs that have an LCD panel with 1080 pixels but which don't support 1080p content. They only upscale 720 to 1080. Some TVs don't support 1080p on all of their HDMI inputs.

Not exactly full marks for either..

http://www.hdtvtest.co.uk/LG-42LF65/

http://www.hdtvtest.co.uk/Samsung-LE40M86BD/
Not quite sure what your saying here, the Samsung LE40M86 does accept 1080P on all HDMI inputs?
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Old 17-12-2007, 13:41
Jarrak
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Not quite sure what your saying here, the Samsung LE40M86 does accept 1080P on all HDMI inputs?



He might be saying that their 1080p/24 support (HD DVD and Blu-ray sources) are not upto scratch which when you are buying a large HD 1080 display might be something worth considering even if you don't yet own a HD optical format.
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Old 17-12-2007, 13:55
paulr2006
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Sure but since June the Samsungs have supported 1080P/24 (From Firmware 1013) which gave an update to the EDID.

Mine is a May model which did not accept 24Hz. but today Samsung are fitting a new mainboard with the latest Firware to accept it.
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Old 17-12-2007, 16:24
TallDave
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There are basically two resolutions:

HD Ready - 768 pixels
Full HD - 1080 pixels.

1080 can either be 1080i or 1080P (both the same resolution, but essentially different frame rates), but 1080i is the only broadcast one.

I suspect you're looking at an HD Ready 768 pixel set that will accept a 1080P signal (from Blu-Ray or something) and display it on the 768 pixel screen. Not all HD sets will accept a 1080P signal, not even the Full HD ones - but any 1080P source should be adjustable to 1080i instead.
HD Ready has a minimum requirement of 720 lines - and does not have to accept 1080p signals.
HD Ready 1080 has a minimum requirement of 1920 x 1080 and must accept 1080p signals.

768 is not a TV resolution, but is ideal for scaling freaks, who like to upscale to 1080i in their DVD players only for their TV to downscale to 768 before displaying the picture .
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Old 17-12-2007, 16:28
Nigel Goodwin
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768 is not a TV resolution.
Don't you mean it IS a TV resolution, but NOT a broadcast resolution - where as 720 isn't a TV resolution, but is a potential broadcast one.
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Old 17-12-2007, 17:24
Jimmy Riddle
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Get the Samsung and stay away from LG.
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Old 17-12-2007, 19:54
CWatters
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Not quite sure what your saying here, the Samsung LE40M86 does accept 1080P on all HDMI inputs?
Yeah sorry I wasn't referring to the two TV's being considered when I wrote my reply.
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Old 17-12-2007, 20:28
paulr2006
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Yeah sorry I wasn't referring to the two TV's being considered when I wrote my reply.
No problem I was just confused!
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Old 19-12-2007, 09:12
TallDave
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Don't you mean it IS a TV resolution, but NOT a broadcast resolution - where as 720 isn't a TV resolution, but is a potential broadcast one.
I meant 768 as a resolution came from the PC world, not the TV (broadcast) world.

720 is a TV resolution (both in broadcast and receiver) - my TV is 1280 x 720.
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Old 19-12-2007, 11:29
Nigel Goodwin
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720 is a TV resolution (both in broadcast and receiver) - my TV is 1280 x 720.
It's a pretty rare set then, they are almost all 768 pixels wide - what set is it?.
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Old 19-12-2007, 16:52
stevejk75
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Nothing wrong with LG tvs.
Get the Samsung and stay away from LG.
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Old 19-12-2007, 23:09
Chris Frost
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It's a pretty rare set then, they are almost all 768 pixels wide - what set is it?.
I beg to differ, Sir.

768 is more likely to be the number of pixels per vertical column, as is 720. Put two columns side by side and you start to build rows. Put 1280 columns together each with 720 pixels vertically and you get to a resolution of 1280x720.

It gets confusing when people talk about horizontal lines of resolution (720, 768, 1080) as in 720p or 1080p. It seems to imply it's the number of horizontal pixels but it isn't.

Some common pixel numbers for screen resolutions:

1280x720
1365x768 or 1366x768
1920x1080

All are valid HD resolutions, as is 1024x1024 resolution used in a lot of ALIS plasma panels from Philips, Fujitsu and others. These are less common now.

Regards
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Old 20-12-2007, 00:27
Pete Baker.
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Very impressed with my Samsung Full HD. There was a Full HD and a normal HD set side by side in the shop displaying text. You could see the jaggedness on the side of letters like w 's, whereas on the full HD it was smooth as.

Thats when I got sent the correct TV. Pixmania (a DSG company) decided to sell me the inferior one on their website, after I searched for the exact model number I wanted!
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Old 20-12-2007, 10:19
Nigel Goodwin
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I beg to differ, Sir.

768 is more likely to be the number of pixels per vertical column, as is 720. Put two columns side by side and you start to build rows. Put 1280 columns together each with 720 pixels vertically and you get to a resolution of 1280x720.
Sorry, typed 'wide' when I meant to say 'high'

But (hopefully) you knew what I meant?.


It gets confusing when people talk about horizontal lines of resolution (720, 768, 1080) as in 720p or 1080p. It seems to imply it's the number of horizontal pixels but it isn't.

Some common pixel numbers for screen resolutions:

1280x720
1365x768 or 1366x768
1920x1080
You don't see many 720 panels though, do you have any examples? - is it perhaps on smaller sets?.
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Old 20-12-2007, 11:23
Chris Frost
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You don't see many 720 panels though, do you have any examples? - is it perhaps on smaller sets?.
More likely to be a rear projection TV driven with a DLP or LCD light engine rather than a panel TV. 720p is very common in the projector world.

Edit: Some of the entry level Panasonic plasmas use a 1024x720 panel. go to http://www.panasonic.co.uk/plasma-tv/index.htm
It's not 1280x720, but is a native 720p panel.

Regards

Chris

Last edited by Chris Frost : 20-12-2007 at 11:32. Reason: extra info
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Old 20-12-2007, 14:24
moisie
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The bottom line is that electronics companies have made HD far too complicated, as well as the different resolutions you have framerates, panels which are one resolution but only display another scaled to fit and so on.
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