by density you mean pitch DPI right .. ?
i know that large tv with high DPI doesn't offer a sharp image quality ..
am asking why the TVs have the same resolution as a 4 inch mopile phone 1080p with a excellent image quality ?
Im not sure what you are trying to understand...there is dpi and there is resolution. Most HD TV's and mainstream monitors run at 1920x1080 resolution or pixels. They will have different dpi based upon their physical size.
Some larger and very expensive monitors and a couple of very expensive tv/monitors have higher resolution (2560x1600, 4000x2000, etc) but they are the exception.
You can have a small device with fewer pixels and most of them do not display 1920x1080 - they drop every other row or column and your brain averages out the picture. They do store the information in the 1920x1080 format.
Part of the issue is how far away are you from the picture...the small device is what - 6" away while the big 65" tv is 6 feet away. Distance matters in your perceived resolution.
and why gamers don't buy a big TV with 1080p resolution and a good quality image so they don't need a high end graphic card like gtx 580
i mean if you want to play game like crysis on a big monitor like 30 inch .. it will be playing it at 2560 x 1600 and that needs a gtx 590 to maxout
BUT if you play it on 30 inch HDTV 1080 you will have the same quality and only with gtx 560
The line 1 has 8 dots.
The line 2 has 8 dots also.
The top line is like a 24 inch hi-def monitor... i.e. more dots per inch DPI
The bottom line is like a 48 inch hi-def TV... The dots are spread out... i.e. less DPI
Each line is the same resolution. If you are half a meter away from a 24 inch 1080P monitor the dots are nearly indistinguishable. At half a meter distance you can really see the dots/pixels and the picture quality looks terrible. If you were playing games from your living room couch 2 meters from the television you could no longer see the pixels and the image would look better. But people don't play games from the couch... They sit at a desk or table and play.
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