16:9 vs just scan displays

[kx11]

i have samsung M18 & i know it's nothing new here but i found out that if you choose (just scan) feautre in your hdtv you'll get more picture than 16:9 option wich corp a little bit of the picture to make it fit the screen


examples:


i played COD4 and tried this function

http://www.za7f33n.com/vb/uploaded/1...d-2%20copy.jpg

notice the space between the menu and the edge of the screen



i hope i made my point clear

[cking2729]

Yea. If I'm not mistaken Just Scan allows the TV to be set to the ratio and resolution native to the content you are playing. It makes a noticeable difference on my set when playing Blu-Rays.

[kx11]

that's what i'm trying to say , even ps2 games will show the full resulotion not the upscaled 1080p fake filled picture , older ps2 games will shows more black edges around and the recent ones will show 720p with less black edges around while ps3 is set on 1080p upscaling , intersting !!!

[MouseRider]

This is a "feature" commonly known in the industry as "overscan" and "underscan" which is a carry forward from the days of analog TVs and inaccurate timing crystals.

To explain it very crudely...

In analog TV broadcast, to accommodate for differences in displays and to prevent viewers from potentially seeing a black border around their picture and later lines that are used to carry information like time code and captioning, all analog TVs are designed to "overscan" which means that the picture is slightly larger than the screen size.

Because of this, broadcasters always followed areas defined as "Motion Safe" and "Title Safe" regions which all TV manufacturers are supposed to adhere to so that nothing "important" gets cut off.

Professional monitors and TVs had a mode called "underscan" which shrinks the picture so that the entire received signal is shown and is shown within the "sweet spot" of the CRT, which is the part that exhibits the least angular distortion.

In digital TV, this is no longer necessary as there isn't or shouldn't be any of the inconsistencies that exist in analog signals. Also, extra-program information no longer need to be transmitted as part of the picture, they just come on a separate data portion of the stream.

Also, pixel display devices such as LCD (LCOS) or DLP (MMD) don't have "sweet spots".

Some HDTVs today, like the one you own, provide an overscan mode to retain compatibility with analog broadcasts (so you don't see what you shouldn't be seeing) and also to help "compensate" for potential analog YUV sources which have slightly different timing which could shift a picture in any of the 4 directions which could result in black lines showing up on the edge of the picture.

This is actually a good feature as some HDTVs that don't have this feature actually does still expand the picture a little and the user doesn't have a choice to override it.