The number, size and shape of pixels on Full HD screen optimized for maximum resolution 1920x1080. Ideally, incoming source should much the display’s native resolution. Upscaling splits source pixels unevenly. Standard definition is 720×576. 1920/720 = 2.66 … is not even. That is why standard definition DVD, Foxtel, Digital Free to Air does not look good on a Full HD screen.
The advantage of Full HD screens appreciated when watching 1920x1080 only, like Blue Ray. Not all of Blue Ray movies and players are 1920x1080.
Furthermore, in some areas, like here at Mona Vale Sydney Northern Beaches no free to air broadcasts in Full HD received at all. The maximum free to air resolution here is 1440x1080 on Gem and One HD.
This is what I get.
High Definition TV broadcasting and image resolutions in Sydney Northern Beaches
|SBS HD||1280×720||Standard HD|
|Go!||704×576||low def (!)|
Now look at the cheap HD screen with 1440×1080 pixels and upscaleing from a regular 720×576 definition. 1440/720 is even number. That is why 1440 screen is better for viewing DVD, Free to Air SD or HD, Foxtel standard or Foxtel HD.
Most of people do not see the difference between High Definition and Standard anyway. So TV broadcasters do not bother to invest.
To fix problem on Full HD screens you can turn on all noise and mpeg filters to max and reduce sharpness. Some Full HD TV models do have a good upscaling technique.