What's the Holdup With 3-D Monitors?
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From: Jasen Betts on 14 Jun 2010 06:34 On 2010-06-14, whit3rd <whit3rd(a)gmail.com> wrote: > On Jun 11, 3:57 pm, Bob Myers <nospample...(a)address.invalid> wrote: >> On 6/10/2010 9:23 AM, Bret Cahill wrote: >> >> > Stereo vision should be easy with LCD monitors. Just polarize every >> > other pixel one way and the remaining half 90 degrees. > > No one seems to have pointed out, that that is VERY HARD. > LCD monitors depend on a polarizer, and those are mass-produced > in UNIFORM SHEETS not in the mosaic as described above. > It takes two, one between the backlight and liquid crystal panel, > and one between the panel and the viewer. all you need to do is add a mosaic of left-hand and right-hand optical isomers over the top of the front polarizer, enough for 45 degrees each way, this means the front polariser needs to be close to the pixel element to avoid parallax errors. stack-up something like this backlight back polarizer substrate (thick plastic or glass) colour filter wiring, TFT etc liquid crystal "backplane" front polarizer twister/repolarizer mosaic front cover (thick plastic or glass) --- news://freenews.netfront.net/ - complaints: news(a)netfront.net ---
From: Bob Myers on 14 Jun 2010 13:41 On 6/13/2010 7:07 PM, whit3rd wrote: > On Jun 11, 3:57 pm, Bob Myers<nospample...(a)address.invalid> wrote: > >> On 6/10/2010 9:23 AM, Bret Cahill wrote: >> >> >>> Stereo vision should be easy with LCD monitors. Just polarize every >>> other pixel one way and the remaining half 90 degrees. >>> > No one seems to have pointed out, that that is VERY HARD. > LCD monitors depend on a polarizer, and those are mass-produced > in UNIFORM SHEETS not in the mosaic as described above. > It takes two, one between the backlight and liquid crystal panel, > and one between the panel and the viewer. > Actually, it's not that hard. There are many 3D monitors being sold today which use exactly this sort of patterned polarizer. (Not many LCD panels, if any, are actually sold that way by their manufacturer, however - very often, the original polarizer is removed by a third party and replaced with a new patterned polarizer film to convert the panel for "3D" use.) >> The other major type currently in use is the "shutter glasses" type, in >> which the LCD is operated at twice the normal frame rate and the >> stereo image pair is presented in field-sequential fashion, with LCD >> "shutters" in the glasses synced with this presentation so as to prevent >> each eye from seeing the other eye's image. >> > My SGI Indy has a shutter-glasses video output, but it wasn't for > LCD imaging because few LCD displays can update fast enough: it was > for CRT systems (at 60 Hz, each eye sees 30 flashes per minute; that's > not too bad, motion pictures were flickery at 24 Hz and are commonly > flashed at 48 Hz with few complaints). The shutter glasses > were LCD items, but the lit screens were CRT, I believe. > LCD-based (meaning LCD as the display device) shutter-glasses 3D is also now on the market. It's much more common in LCD TVs than monitors at present, due to the difficulty of driving smaller high-resolution LCDs at the requisite pixel rates, but it IS starting to come to the monitor market as well. Bob M.
From: Bret Cahill on 14 Jun 2010 16:51 > >>> Stereo vision should be easy with LCD monitors. Just polarize every > >>> other pixel one way and the remaining half 90 degrees. > > > No one seems to have pointed out, that that is VERY HARD. > > LCD monitors depend on a polarizer, and those are mass-produced > > in UNIFORM SHEETS not in the mosaic as described above. > > It takes two, one between the backlight and liquid crystal panel, > > and one between the panel and the viewer. > > Actually, it's not that hard. There are many 3D monitors being sold > today which use exactly this sort of patterned polarizer. (Not many > LCD panels, if any, are actually sold that way by their manufacturer, > however - very often, the original polarizer is removed by a third party > and replaced with a new patterned polarizer film to convert the panel > for "3D" use.) > > >> The other major type currently in use is the "shutter glasses" type, in > >> which the LCD is operated at twice the normal frame rate and the > >> stereo image pair is presented in field-sequential fashion, with LCD > >> "shutters" in the glasses synced with this presentation so as to prevent > >> each eye from seeing the other eye's image. > > > My SGI Indy has a shutter-glasses video output, but it wasn't for > > LCD imaging because few LCD displays can update fast enough: it was > > for CRT systems (at 60 Hz, each eye sees 30 flashes per minute; that's > > not too bad, motion pictures were flickery at 24 Hz and are commonly > > flashed at 48 Hz with few complaints). The shutter glasses > > were LCD items, but the lit screens were CRT, I believe. > > LCD-based (meaning LCD as the display device) shutter-glasses 3D is > also now on the market. It's much more common in LCD TVs than monitors > at present, due to the difficulty of driving smaller high-resolution > LCDs at the > requisite pixel rates, but it IS starting to come to the monitor market > as well. Yet another planned obsolescence scam. Bret Cahill
From: Bob Myers on 14 Jun 2010 18:55 On 6/14/2010 2:51 PM, Bret Cahill wrote: >> >> LCD-based (meaning LCD as the display device) shutter-glasses 3D is >> also now on the market. It's much more common in LCD TVs than monitors >> at present, due to the difficulty of driving smaller high-resolution >> LCDs at the >> requisite pixel rates, but it IS starting to come to the monitor market >> as well. >> > Yet another planned obsolescence scam. > I hesitate to ask - but I'm sure the answer will at least have some entertainment value: How so? Bob M.
From: Michael A. Terrell on 14 Jun 2010 19:39
Bret Cahill wrote: > > Yet another planned obsolescence scam. Complain to your parents. Your birth was their scam. -- Anyone wanting to run for any political office in the US should have to have a DD214, and a honorable discharge. |