Your Sharp Aquos 40D78UN is a 1080P HD display, and will provide razor sharp, vibrant images if provided with an HD signal.
HD signals (those that are 720P, 1080i and 1080P) are only available from the following sources:
1) Local "off air" (antenna) HD broadcasters (providing HD content) delivered via the coaxial antenna terminals.
2) An HD source such as a stand alone Blu Ray (BD) Disk player, PlayStation 3 optical (BD) disk, HD service provided by DirecTV, Disk Network, Local CATV provider or other satellite service delievered to the TV via any of the (3) HDMI jacks or (2) Component RCA jacks (RGB). Satellite and CATV providers offer both SD and HD service. You must have HD service to watch programs in the higher quality HD format.
3) Computer signals delivered via the PC (VGA 15 pin) jack - such as movies or video in HD or Netflix HD.
It is important to note that any signal source (regardless if 720 or even 1080) that is delivered to the TV via either of the (2) "A/V" RCA jacks, will be limited to SD or 480i resolutions.
An HD picture is only possible when the source is HD, it is brought to the display over HD cables to HD capable jacks on the TV and, the display is capable of at least 720P. If any one of these variables is missing or substituted, the picture quality will be reduced significantly.
CNet has a helpful review and discussed HD signals. it is only a couple pages in length and may help you understand even better. I hope this helps and good luck! Please rate my reply - thank you.
I forgot the link to the CNet article :http://tinyurl.com/4mbvdh2
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