In our "Truth in Advertising
post some time back, we discussed HD resolutions and our desire for mandatory labeling of display resolutions. HD Beat
reader Mark recently commented
question regarding 720p signals on a set that doesn't natively display 720p."I'm going to buy an
hdtv and am considering the Panasonic CT-34WX15
TAU. (crt)It supports HDTV @ 1080i and EDTV @ 480p. My question is what happens when I view a resolution at 720p? Is
this set going to display it properly? Also, the Panasonic DVD-S77 player puts out 1080i and 720p. Where is the 720p on
I actually own the same basic Tau series CRT, but this question can be applied to any
set that doesn't natively display a 720p signal.
Mark, the simple answer is that your set will display a 720p signal at 1080i due to upconversion. Like many other
CRTs, your set (and mine) don't display 720p natively, so the set will automatically modify the incoming signal to make
it display at 1080i. You may also have some settings for this conversion on a set-top box or ATSC tuner. This is both
good and bad: theoretically, the picture is at a higher resolution because more pixels are displayed overall, but the
set is only drawing half of the scan lines during each frame. Ultimately, it's a good thing because if the set wasn't
capable of converting the 720p signal, you wouldn't get a picture at all with the signal!
For the DVD player
that can output at 720p or 1080i, you might want to do some experimentation with both settings. The 720p setting will
likely still work with your 1080i set as the set should modify the signal to a 1080i display. However, since your set
natively displays at 1080i, consider "matching" that setting with your set by pumping out a 1080i signal from
the DVD player. As a general rule of thumb, the less conversion the better and don't forget: to take full advantage of
the upconversion from that Panasonic
, you must use the HDMI connection.