Tester

I currently have a projector but I am in the middle of a dilema. . I am debating whether or not to return my projector and get a hitachi 51". The projector I currently have has 2000 lumen, xga native, 1000:1 contrast. The debate is whether buying say a 50" projection screen from panoview would almost look the same quality as buying a 51" hitachi. (I do miss not having a bulky box :mecry I am curious what is it that makes rear-screen projection tvs so bright, this could be a misconception, but I hear from a lot of people that hdtvs are a bit, "bit", more clear then projectors and are brighter. But I want to know what makes them brighter? I assumed that the DLP tech and the projector that I bought has better technology. What is it that makes you have the ability to watch rear tvs during the day? Because I thought that 2000 lumen would be 2x the power of a rear screen tv? Is there something special with the screen and how it is but inside a box?

If so would there be a way to make my projector look the same during the day will some highly modded stuff?

What would you prefer, a 51" rear-screen tv (leave dlp and lcd out of this) or a 20ft x 20ft projector? Thanks your opinions are appreciated

Fastlane247

IMO i would say it is because the projector is inside the tv rather then in the room and the inside of the tv is very dark so when it projects there is no outside light that gets in the way of the beam. I could be wrong on this but that is how i have thought of the crt rptvs

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Splicer

That is pretty much it. A RPTV (CRT) has less of a distance to throw the light and the light that is emitted has its integrity intact thanks to being enclosed in a box. A projectors light must compete wit any ambiant lighting there may be, not to mention the distance. If you put a pJ closer, the picture gets brighter.

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wifeB8

Some interesting links for you to look at:
http://www.projectorpeople.com/projectors/qa.asp?qa=18

http://www.projectorcentral.com/big_screen_tvs.htm

This is a misconception. Yes an RPTV will out perform a front projector if you have ambient light in the room, but if the room is light controlled the Front projector will give you just a bright of an image on a larger scale than and RPTV.

I’m assuming that your front projectors displays HD resolutions and not just accepts an HD signal and displays it in ED mode. If you take the same image size and compare it side by side they will look the same. In fact your viewing angle will be much greater with a front projector.




You have partially answered your question. You in essence have a light controlled environment in your RPTV box, and the distance that your output light travels is considerably shorter that in a front projection system.



No need for highly modified stuff, just make sure that you have access to an ambient light controlled room. If not than a front projector might not be the best option if daytime viewing is a must.



These technologies all have there up sides and down sides. It’s up to you to maximize the upsides for your particular setup. So, to answer your question if I have maximized my particular setup in my case I would prefer a front projector on a 100” screen than a RPTV at 51”. In your case this might be the opposite.

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brector

WifeB8 nailed it. If I had more cash and a dedicated room - I would have gone with a front projector. But for my budget and not having a HT only room I went with rear projection.

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Paul Mohr

From what I understand it has to do with the fact that it is rear projection. In a front projection system the light hits a reflective screen and bounces it back to you. The downside is any ambient light will also reflect off the screen washing it out. So you need to be very observant of ambient lighting. Also different screens look better, a more reflective screen will be brighter. As would a smaller picture with the projector closer to the screen.

A RPTV uses a lenticular lens I believe it is called. You shine the light on the back of it and it bleeds thru so you can see it. The front side of it is not reflective so ambient light does not effect it as much.

There is such a thing as a rear projection large screen. The only problem is you need a whole room dedicated for the projector. I believe you can get a screen that will work like the RPTVs in a bigger size. I doubt it would be cheap though. And I also believe some projectors will invert an image just for this popose.

This was years ago when I was reading about this though. I will research it and see what I can find.

Paul

oman321

"There is such a thing as a rear projection large screen. The only problem is you need a whole room dedicated for the projector. I believe you can get a screen that will work like the RPTVs in a bigger size. I doubt it would be cheap though. And I also believe some projectors will invert an image just for this popose."

Yes some projectors will invert the image for the purpose of using it as a rear projector with a translucent screen. A quick google search gives you many options for screens like this one:

http://store.yahoo.com/shophiq/40539.html

This projector has this feature.

http://www.optomausa.com/optomausa/...s_bproj_751.jsp

It also turns picture upside down for ceiling mounting.

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wifeB8

You need more that just the screen to be able to reproduce what a RPTV does. Look at post #3 http://www.hdtvoice.com/voice/showthread.php?t=17119 very expensive proposition IMO. With DLP and LCD screen sizes getting bigger with every model introduction I can't see the reasoning for trying to convert a front projection system into a RPTV system. You must be aware of ambient light issues when purchasing a front projector system even though newer technology is making it less of an issue, but only to a certain point.

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