I'm new too with CRT PJ. I had many LCD before. One argument of the pro crt is that there is no little squares. Yes crt do not have these because it does not have a lcd matrix. But crt are worst because the lines are more visible than the lcd squares. If i had know that before buying my 1270Q i'd bought a DLP.
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crt vs dlp/lcd
I currently own a NEC DP1200 PROJECTOR. It's age is around 12 or 13 years now and the red tube had gone out. It has been a great projector however the company I bought it from has gone out of business and no one in the Baton Rouge La area have any idea what I'm talking about when I mention it. I am wondering if it is worth it to try to repair this projector or should I consider replacing it with a DLP or LCD projector. I am new to this board and was refered here by a good friend. Any of your suggestions and comments would be greatly appreciated.
Thank you.
Earl Allain
Thank you.
Earl Allain
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The scanlines are only visible if you feed a CRT too low a resolution, hence scalers/HTPC's. If you send them a higher res signal the scanlines can be pushed closer together or even touch giving a totally smooth image. A 1270 for example, needs about 600 to 660p to hit that "sweet spot". You can feed it 480p from a progressive scan dvd player but then the lines will be somewhat visible.
Welcome to the forum.
Your best bet would be to replace your broken pj with a better model used CRT.
The cheapest DLP will cost at least as much as a very good condition 7" es focus pj such as a Sony 1272.
If your budget allows however, start looking for an 8' EM focus pj.
Forget about scan lines being a problem. The reason that scan lines would be visible on any data grade CRT Pj is because the user is not inputing an optimum resolution to the pj.
For a Sony 12XX pj with a 16:9 set up, scan lines begin to overlap at over 600P.
A 8" CRT with good tubes run at 720p, will throw rocks at ANY digital other than some of the very high end equipment >15k range.
Your best bet would be to replace your broken pj with a better model used CRT.
The cheapest DLP will cost at least as much as a very good condition 7" es focus pj such as a Sony 1272.
If your budget allows however, start looking for an 8' EM focus pj.
Forget about scan lines being a problem. The reason that scan lines would be visible on any data grade CRT Pj is because the user is not inputing an optimum resolution to the pj.
For a Sony 12XX pj with a 16:9 set up, scan lines begin to overlap at over 600P.
A 8" CRT with good tubes run at 720p, will throw rocks at ANY digital other than some of the very high end equipment >15k range.
I see, i have a VGA 2 RGBHV cable coming. For now i'm connected in S-VIDEO from my RJTech DivX player. I think it send a 640x480 signal.
I'm with Don. THe DP 1200 was good in it's day, but at 13 years old is a bit long in the tooth..
The only NEc you want to stay away from is the GP 3000, they too now are unreliable, but a good condition NEc PG series or an XG will give results far superior to any
The only NEc you want to stay away from is the GP 3000, they too now are unreliable, but a good condition NEc PG series or an XG will give results far superior to any
ProbeGT90, if you're driving your projector with svideo, you're missing out on a lot. First off, the resolution is too low and it's interlaced, so you'll see scan lines (as you reported). Get a DVD player that outputs RGBHV (VGA connector). There'a a couple of good ones mentioned here that are less than $300. Or, get a scaler or build an HTPC.
Cary
Cary
I already have it, my DivX player have VGA, Composite, SVIDEO and PrYCb. I just dont have the cable yet.
Probe Guy,
When you get your breakout cable, give 1080i a try if the player you bought supports this res via RGBHV.
I found 1080i to be the best resolution for the 1272.
480i ! No wonder you're disappointed in the scan lines. Even 480p will have plainly visible scan lines though the pq is MUCH better than 480i s-video
When you get your breakout cable, give 1080i a try if the player you bought supports this res via RGBHV.
I found 1080i to be the best resolution for the 1272.
480i ! No wonder you're disappointed in the scan lines. Even 480p will have plainly visible scan lines though the pq is MUCH better than 480i s-video
Quote:
Well aren't you glad you found this forum, now you can start enjoying your 1272 and quit blaming it for your cabling mistakes.
| Originally posted by ProbeGT90 I'm new too with CRT PJ. I had many LCD before. One argument of the pro crt is that there is no little squares. Yes crt do not have these because it does not have a lcd matrix. But crt are worst because the lines are more visible than the lcd squares. If i had know that before buying my 1270Q i'd bought a DLP. |
i'm glad i found this forum for sure ! I know i'll love this PJ when i'll see 720p picture and above ! but those PJ are SO BIG and full of circuits that i fear it will be broken often.
btw stop telling i have a 1272 ! it's a 1270Q i have ! hehe
btw stop telling i have a 1272 ! it's a 1270Q i have ! hehe
Earl, if you can handle dealing with having the tube replaced, or just buying another CRT, they still have the best PQ hands down.
If you want a shoebox light cannon, then get a DLP or LCD projector
I have both the Barco and a Infocus DLP, they both have there places.
If you want a shoebox light cannon, then get a DLP or LCD projector
I have both the Barco and a Infocus DLP, they both have there places.
Ok, today i got my cable (VGA to RGBHV). I got a taste of 1600x1200 with my HTPC. Swweeaaat lord in heaven !!! I did'nt know that any home hardware could acheive that !! the picture is incredible !!
but there is something strange.. when i change resolution i have to re-adjust the pj.. skew, bow, etc, etc
but there is something strange.. when i change resolution i have to re-adjust the pj.. skew, bow, etc, etc
Yes you do have to set the PJ up for each resolution. Do it once and make sure you save each set up and you won't have to do it again.
i'm new with all this.. i can't adjust the blue correctly with the green.. i think it's because the optics or spacers are set for the pj be fixed at the ceilling.. and now i use it on a small table.. do i have to unscrew the optics and place them on a special maner ?
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you can't adjust what exactly, optical focus or electronic convergence?
| Originally posted by ProbeGT90 i'm new with all this.. i can't adjust the blue correctly with the green.. i think it's because the optics or spacers are set for the pj be fixed at the ceilling.. and now i use it on a small table.. do i have to unscrew the optics and place them on a special maner ? |
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Digital projectors have little grey boxes arround the pixels. Your seating distance may or may not make this visible. You may or may not find it objectionable. I don't think 1366x768 LCD projectors or 1024x576 DLPs are suitable for home theater use. CRTs have no visible projection structure when you feed them an appropriate signal. A $200 Momitsu DVD player will do that.
DLPs give some people headaches (me). You probably won't get them. TI's marketting people don't admit they exist. One engineer said it was probably a dithering problem and that the algorithms were improving. YMMV.
CRT projection works by illuminating phospherescent material with an electron beam. With no electrons you get no emissions. Digital projection works with an always-on light that's either reflected (DLP/LCOS/DILA) or blocked (LCD) by some sort of pixelated device. Light leaks and bounces arround inside the projector. So CRT projectors do absolute black, digital projectors do not. You may or may not care about this.
CRT light output limits are lower than digital projectors. This is definately not an issue on a 7-8' wide screen. Some people use bigger screens with higher gain to get more light. Some people use curved screens so they get more light without artifacts. Some people don't mind the reduced brightness on a larger screen.
CRT setup is more complex and they're big. Digital setup is easy and they're small.
Pick your poison.
| Originally posted by Earl Allain I currently own a NEC DP1200 PROJECTOR. It's age is around 12 or 13 years now and the red tube had gone out. It has been a great projector however the company I bought it from has gone out of business and no one in the Baton Rouge La area have any idea what I'm talking about when I mention it. I am wondering if it is worth it to try to repair this projector or should I consider replacing it with a DLP or LCD projector. I am new to this board and was refered here by a good friend. Any of your suggestions and comments would be greatly appreciated. Thank you. Earl Allain |
DLPs give some people headaches (me). You probably won't get them. TI's marketting people don't admit they exist. One engineer said it was probably a dithering problem and that the algorithms were improving. YMMV.
CRT projection works by illuminating phospherescent material with an electron beam. With no electrons you get no emissions. Digital projection works with an always-on light that's either reflected (DLP/LCOS/DILA) or blocked (LCD) by some sort of pixelated device. Light leaks and bounces arround inside the projector. So CRT projectors do absolute black, digital projectors do not. You may or may not care about this.
CRT light output limits are lower than digital projectors. This is definately not an issue on a 7-8' wide screen. Some people use bigger screens with higher gain to get more light. Some people use curved screens so they get more light without artifacts. Some people don't mind the reduced brightness on a larger screen.
CRT setup is more complex and they're big. Digital setup is easy and they're small.
Pick your poison.
Quote:
... and an inability to see the forest because you've become so fixated on the pixels.
| Originally posted by Drew Eckhardt DLPs give some people headaches (me). |
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I'm personally fine with lower levels, but there are definitely people who the image brightness is an issue for even on those screen sizes. Some people just like brighter images. Especially without 9" guns.
I think those who have grown used to CRT levels are more likely to be happy with them, in general.
--Darin
| Originally posted by Drew Eckhardt CRT light output limits are lower than digital projectors. This is definately not an issue on a 7-8' wide screen. |
I think those who have grown used to CRT levels are more likely to be happy with them, in general.
--Darin
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