Robert P. Jones
Second Unit
- Joined
- Jun 18, 1999
- Messages
- 289
The following are some comments I made recently at the SPot, in reply to some questions on this issue. I thought I'd share them here also.
ALL the DLP RPTVs I have seen yet, including the ones I saw at CES in January, have optics that are made for the pricepoint, and show it. As such, they all have refraction error for the entire last foot or so of their picture, at both the right and left sides.
This appears as/looks like convergence error, but of course is not. No convergence error possible on these, since they are single chip with color wheel, and as such use only one lens.
Which means that the extremely short throw causes this irritating refraction error once the angle from center is great enough. Which of course is at the sides.
With CRT technology, we can make those areas perfect. With DLP technology, we cannot. We are stuck with those refraction errors for a full foot of picture on each side.
Other than that, and the fact that they will always be just a little more pixellated than CRT whenever you are sitting close enough, they're great.
But I would want a display device where any convergence error could be corrected essentially completely, as in the current CRT systems - Mit has one of the best - and where there would be none of this distracting refraction error.
Fully and properly tweaked, my 65" last year's CRT-based Panny has it all over anything I saw at CES, as far as DLP goes. No DLP RPTV will beat it. As far as I am concerned, that goes for the Mits CRT-based units also, once fully tweaked.
Except for the master DLP projector at the Texas Instrument booth, the one Lucas is touting as the future of the movies we go out to see, and where he wants to show his future Star Wars movies, being digital as they will be - Episode II was shot completely in digital.
The huge picture from this movie theater grade projector was picture perfect, having no short throw to have to worry about; it will save tons of money in not having to make and transport cumbersome reels of the miles of film it currently takes for our mall theater movies, its anamorphic lenses are custom made per projector by Minolta, and only costs the theater using it $250,000...
Mr Bob
ALL the DLP RPTVs I have seen yet, including the ones I saw at CES in January, have optics that are made for the pricepoint, and show it. As such, they all have refraction error for the entire last foot or so of their picture, at both the right and left sides.
This appears as/looks like convergence error, but of course is not. No convergence error possible on these, since they are single chip with color wheel, and as such use only one lens.
Which means that the extremely short throw causes this irritating refraction error once the angle from center is great enough. Which of course is at the sides.
With CRT technology, we can make those areas perfect. With DLP technology, we cannot. We are stuck with those refraction errors for a full foot of picture on each side.
Other than that, and the fact that they will always be just a little more pixellated than CRT whenever you are sitting close enough, they're great.
But I would want a display device where any convergence error could be corrected essentially completely, as in the current CRT systems - Mit has one of the best - and where there would be none of this distracting refraction error.
Fully and properly tweaked, my 65" last year's CRT-based Panny has it all over anything I saw at CES, as far as DLP goes. No DLP RPTV will beat it. As far as I am concerned, that goes for the Mits CRT-based units also, once fully tweaked.
Except for the master DLP projector at the Texas Instrument booth, the one Lucas is touting as the future of the movies we go out to see, and where he wants to show his future Star Wars movies, being digital as they will be - Episode II was shot completely in digital.
The huge picture from this movie theater grade projector was picture perfect, having no short throw to have to worry about; it will save tons of money in not having to make and transport cumbersome reels of the miles of film it currently takes for our mall theater movies, its anamorphic lenses are custom made per projector by Minolta, and only costs the theater using it $250,000...
Mr Bob