Need some help understanding resolutions

[arbiterrecon]

Okay so I know that 8k , 4K are UHD and 1080p and 720 are HD, I know that much but I'm confused on how that ties in with screen size or tv size
Let's say I have a 720p tv it's like 40 inches but I also see 40inch TVs that are 720p how does that work
Also I know it's #### X 720p does the last set of numbers mean that's what the definition is. Hope that's not too confusing

 

[rgd1101]

720 is the pixel, 40 inch in the screen size.

With the same pixels, larger screen compare to smaller one mean the pixel itself are bigger.

 

[photonboy]

1) 720p refers actually to the number of horizontal LINES. It's usually actually 768p (768 lines). The "p" just means progressive as. They used to be interlaced (skip lines then go back to prevent fluctuating brightness in CRT "tube" screens).

2) 2K, 4K etc mean the number of VERTICAL lines approximately. For 4K which has "3840x2160" this means almost 4K vertical lines and 2K horizontal lines.

We could have also called 4K "2160p" but that's not as catchy.

 

[photonboy]

1080p (1920x1080) is recommended in general.

4K has 4x the number of pixels but it can be hard to notice the quality improvement unless you sit close. There are other factors in what provides a good picture, so...

There are 1080p screens which have much better picture than some 4K screens. Cheaper 4K especially sacrifice every where they can such as the video processing unit.

(roughly at least 1.5X the viewing diagonal. For a 48" screen if sitting SIX FEET or further back you may not notice any difference between 4K and 1080p)

Some HDTVs have high input lag and are not recommended for gaming.

 

[arbiterrecon]

I sit very close to my tv and use it for Xbox one and PC Gaming can you have a small tv that is 4K ?

 

[rgd1101]

sure. even a 11 inch laptop can have 4k.

 

[arbiterrecon]

Okay.. So I guess with a small screen 4K tv being like 3800 X 2100 pixels, the pixels themselves are smaller. Does that affect quality ?

 

[rgd1101]

not really, but some screen are better then other.