The Art of Home Theater Projectors

RonJ's first blog – An Understanding of 3D and Projectors

Hi!  OK, RonJ’s own blog is up and running.  As promised, therefore, I’m deleting it from here (with a link to his first blog article on his own blog:  Projectors:  The Technical Side…     This blog is Titled:  Moving to 3D Click to enjoy.

A couple of folks posted comments to this blog.  I had asked to wait until RonJ’s was up.  OK, bottom line, a couple of you, that I suggested post your comments on Ron’s blog, instead reposted on this one, but addressed to Ron.  Ron has no access to my blog, other than as a reader.  Please (Peter, and one other) repost on to Ron’s blog, at the address above.

Or if you prefer to jump to his blog’s homepage:

News And Comments

  • Edwin Jaehn

    1. The horizontal display width should be 1920– your dimension is incorrect at 1080 pixels.

    2. Active glasses are not going to survive– nobody wants them. Will passive glasses, as in movie theaters, be a possibility for projectors. I ask this because LG and Toshiba now have passive, polarized glasses in their new lines of 3D TVs.

    Very informative info. Thanks,

    • Lisa Feierman

      Ed, could you repost to Ron’s blog. He’ doesn’t have access to mine (other than as a reader like yours. I can say that the issue of Active vs. Passive – passive have obvious advantages, also, in a normal setup, though, reduce the resolution by 50% on the vertical, if I understand correctly, therefore you are really watching (If I have this right – and Ron is the guy to ask), 1920×540 resolution. I agree, though, most people don’t want active glasses, in fact most don’t want passive glasses. The newer active glasses are getting a lot lighter, and, for example the new Sony’s are rechargeable, with enough charge to watch about 60+ movies, between charges.

      With projectors, especially single chip DLPs active glasses make for a really easy solution.

      With projectors, remember, passive glasses require a 3D optimized screen, so it’s not exactly the same thing active vs. passive with LCDTVs. While the new Panasonic is rumored to be 3LCD, and most likely, active glasses, most of the 3LCD 3D I’ve seen, uses a stack of two projectors, polarizers and passive glasses.

      At this point, the low cost advantage goes to the designs using active glasses, but, of course having 6-8 pairs of the glasses so you can watch with friends, goes part way to making up for the difference in future costs of active vs passive.

  • Peter riedel

    Hello Ron,
    I originally wrote the following e-mail to Art F., who suggested that I send it to you for your opinion.

    As you know, the light-output of the new 1080p 3D home-theater projectors is often inadequate for really large screens and/or bright images. A rather simple workaround to solve this problem, plus a few others, would be to use two identical 2D projectors. These could be used separately and alternately for 2D movies, or linked together for 3D. The circuitry required to make it work could be built-in, or use an external box for this purpose. If the 3D-capability was integrated into the projectors and was based on existing ones (like the Epson 21000, or 8700 for example), the total cost would not need to be much more than the 2X the cost of a single projector plus the extra circuitry. However, the use of an outboard box to do the same would probably cost considerably more, but could be used with unmodified projectors. Either approach would not necessitate developing entirely new projectors and would provide 2X the light-output (by default) for 3D – when it is most needed.


    Peter Riedel
    My idea is that when the projectors are linked and recognize a 3D signal, they automatically would work in tandem to correctly, separately show the L and R frames. The player would be plugged into the “first projector”, which would be plugged into the “second projector” – this order determines which image each projector shows – but they are both interchangeable. They could also “take turns” for 2D use to age their lamps more uniformly, “remembering” which one was in 2D-operation the last time. Of course, they could also be used singly for only 2D – but upgradable to 3D by simply getting a second one.

    • Lisa Feierman

      Hi Peter,

      As I think I emailed. You still need to post your question on Pete’s blog, not on mine again. We only used my blog to get word out on Pete’s with the intro, and brief showing of his first blog. Pete doesn’t have the ability to answer on my blog. -art