this is something that i've been confused by for some time now.
for instance, when my hitachi 57s715 is recieving a 480p or720p signal, the tv has to scale it to either 540p or 1080i. now if it's able to display 540p, why can't it display 480p or 720p?

this is something that i've been confused by for some time now.
for instance, when my hitachi 57s715 is recieving a 480p or720p signal, the tv has to scale it to either 540p or 1080i. now if it's able to display 540p, why can't it display 480p or 720p?

The design engineers, for whatever reason, decided to incorporate only one horizontal scan frequency of 33.75kHz for your display. The internal scaler takes all incoming formats 480i,480p,720p and scales to 1080i and or 540p. This was done more than likely to cut production costs. The CRT is still the only device that can display all HDTV formats in their native resolution.

One of the earlier CRT RPTVs, a Panasonic model, could display both 720p natively (1280X720 progressive) as well as 1080i in interlaced form. It has been out of production for years, because, as mentioned, set makers found they could trim production costs by sideconverting 720p to 1080i and upconverting 480i SD to 540p. 540p, electrically, is very close to 1080i, so one circuit handles both sweep rates. Some CRT RPTV models, though, also offer 480i/p modes. 720p's higher sweep rate requires costlier, more-robust semiconductors and coils that handle higher currents. -- John

The CRT is still the only device that can display all HDTV formats in their native resolution.

Except 1080p (Blu-ray/HD DVD).

The CRT is still the only device that can display all HDTV formats in their native resolution.

Are you sure about this? I thought CRT's can ACCEPT all HDTV Formats, but will only display them @ the displays Native Resolution.

Except 1080p (Blu-ray/HD DVD).

A Sony VPH-G90 wouldn't even break a sweat displaying 1080P

A Sony VPH-G90 wouldn't even break a sweat displaying 1080P

I was thinking consumer-based CRT RPTVs.

Are you sure about this? I thought CRT's can ACCEPT all HDTV Formats, but will only display them @ the displays Native Resolution.

That's CRTs in the generic sense, not one particular implementation. There is no fixed pixel array, so as long as the CRT can sync to the horizontal and vertical scan frequencies of the signal, it can display it "natively". My old Pioneer Elite could sync to horizontal scan frequencies of both 31.5kHz and 33.75kHz, so it could natively display 480p and 1080i.

Some high-end front projection CRTs can sync (and therefore display) 1080p, but I'm not aware of any CRT-based RPTV ever produced that could.

Are you sure about this? I thought CRT's can ACCEPT all HDTV Formats, but will only display them @ the displays Native Resolution.

Yes, as John mentioned earlier Panasonic made a set that could lock on and scan
1080 i at 33.75kHz or 720P which runs at 45kHz. The Sony G90 scans up to 135 kHz and has a maximum resolution of 2500 x 2000. That's way past 1080P

Yes, as John mentioned earlier Panasonic made a set that could lock on and scan
1080 i at 33.75kHz or 720P which runs at 45kHz. The Sony G90 scans up to 135 kHz and has a maximum resolution of 2500 x 2000. That's way past 1080P

I'm confused... :confused: The OP asked about RP CRT. Isn't the G90 A FP CRT

I was thinking consumer-based CRT RPTVs.

Yes, you are correct. Much to my chagrin no one has or probably ever will. As was mentioned earlier, Panasonic is the only one who ever came close.

I'm confused... :confused: The OP asked about RP CRT. Isn't the G90 A FP CRT

I'm truly sorry if i confused you. I answered the OP to the best of my ability and then went on to praise the merits of a CRT not necessarily a CRT RPTV.

ah. so although it is possible for an rp crt to display 720p natively, it's not something common to have due to manufacturers wanting to lower production costs?
i wish i would've looked into this more a few years back when i bought mine.

I was thinking consumer-based CRT RPTVs.

LOTS of G90's now owned by consumers...VERY NICE INDEED!

My Pioneer Pro 510 will display 480p and I think 720p or maybe it upscales all of them to 1080i, I can't remember now...been so long since I have looked at that stuff. I just know that the PQ on a Pioneer Pro is hard to beat even by today BEST RPTV's!

The Sony 70" I just bought is better on HD, frankly probably not as good on SD mostly because the screen is just SOOOO BIG!

I hope to have a G90 and about 130" of screen someday!

Most early crt based rptvs would do native 1080i and 480p, the above mentionned Panasonic was the only one I know of that would do native 720p as well.

Sony crt based rptvs up until (I think) the 520 series would do native 480p. I had an '01 model KP57HW40 that would do native 480p and native 1080i, but downconverted 720p to 480p. Hitachis and Toshibas of the same model year would only do 540p and 1080i, Mits followed the next year. A set that would do native 480p had a very nice film like image from a good progressive scan player, actually better than when used with one of the few upconverting players that would do so over component inputs.