How to buy a LCD ?? Pixel Mapping??

Forums › Home Theatre (incl HTPC) › How to buy a LCD ?? Pixel Mapping??

m1k30rz

34 posts

Geek

#57178 4-Feb-2010 20:35

Hey,

So I got a media center with a 8800GTX (no im not changing the card any time soon) and it does all my freeview tuning etc.

I want to buy a new LCD HDTV in the 37 to 42 inch range.

My budget is basically $1500 max maybe stretched to 1700 if its _REALLY_ REALLY worth it.

Now I know I want 1920x1080 but I was told about pixel mapping where as if the LCD doesnt do 1:1 pixel mapping you will get the edges of the screen chopped off..

Nobody in the shops advertise anything about pixel mapping and I have a real hard time trying to find any info on manufactuers sites as well.

Do I really need 1:1 pixel mapping or is there a workaround? and if I do what TV's actually have it? most of them these days or will I have to really look around?

Will be using HDMI as well and one salesman said if it has HDMI you dont need pixel mapping it will always fully fit :\ is that right?

thanks

dale77

292 posts

Ultimate Geek

#296190 4-Feb-2010 20:53

Do I really need 1:1 pixel mapping or is there a workaround? and if I do what TV's actually have it? most of them these days or will I have to really look around?

Will be using HDMI as well and one salesman said if it has HDMI you dont need pixel mapping it will always fully fit :\ is that right?

thanks

On the Samsung LA40B530 ($1500), using ATI4670 over HDMI, filling the screen (which may be 1:1 pixel mapping, but I'm not totally sure) is accomplished by setting 1920x1080 res, overscan to 0% and setting the TV from 16:9 mode to "Screen fit" mode.

On this TV, over HDMI you certainly can get both black bars around the image (ATI overscan not 0%) or a chopped off desktop (16:9 mode on the tv).

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sbiddle

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#296191 4-Feb-2010 21:02

1:1 pixel mapping isn't really a big issue these days. A few years ago it was a big problem particularly with TV's that were 1024x768 and 1280/1366x768.

Now most TV's that do 1920x1080 over HDMI will give you 1:1 pixel mapping at 60Hz

dale77

292 posts

Ultimate Geek

#296196 4-Feb-2010 21:13

Now most TV's that do 1920x1080 over HDMI will give you 1:1 pixel mapping at 60Hz

Is this a special feature of 60Hz? I run 50Hz for PAL TV.

Masterpiece

242 posts

Master Geek

#296216 4-Feb-2010 21:47

You usually find that most displays that do 1:1 pixel mapping are not set that way by default, usually you have to maually set the display and likewise a PC to send correct matching scaling.

The concept for overscan in the first place is to hide edge artifacts, typically ranging from 5%~15%.
The effect can result in a scaled image even if you send 1920*1080, ie the image is 15% overscaned from the source.

It is an important setting to have, especially for a 1080 display system.

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m1k30rz

34 posts

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#296221 4-Feb-2010 21:54

do you guys think this one will do the trick?

http://www.dse.co.nz/dse.shop/...

Niel

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#296283 5-Feb-2010 06:14

Give the DSE stock number, links do not work as it is valid for only your session.

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sbiddle

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#296284 5-Feb-2010 06:48

dale77:
Now most TV's that do 1920x1080 over HDMI will give you 1:1 pixel mapping at 60Hz

Is this a special feature of 60Hz? I run 50Hz for PAL TV.

A few older Samsung's I've played with wouldn't do 1:1 pixel mapping at 50Hz over HDMI. This would explain why you had to mess with things.

50Hz should be used for PAL video content to avoid any tearing.

m1k30rz

34 posts

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#296309 5-Feb-2010 08:45

Hey sorry about that the DSE stock code is GE6446

Nety

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#296362 5-Feb-2010 11:31

I would certainly make sure that it does 1:1 pixel mapping. I brought a Sony 46" 1080p TV last year and by default pixel mapping was not turned on and the picture had overscan breaking 1:1 pixel mapping. This is via HDMI so the sales man's advice that it will always fit ie use 1:1 is NOT correct.
The problem you have is that manufactures call pixel mapping different things so it can be hard to confirm. Best to look at the manuals for the TV's you are looking at. If you can get them in electronic form (you can for most) just search for 1:1.

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1gkar

722 posts

Ultimate Geek

#297708 10-Feb-2010 16:28

Also, some LCDTVs don't do pixel mapping on all HDMI outputs. I got caught out when I bought my Samsung. It will do 1:1 on HDMI 2 only. In the maual's fine print.

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