Do You Prefer Active or Passive 3D Flat Panels? - AVS Forum
View Poll Results: Do You Prefer Active or Passive 3D Flat Panels?
Active 116 38.28%
Passive 114 37.62%
I hate 3D, so I don't care 48 15.84%
I've never seen a 3D TV 25 8.25%
Voters: 303. You may not vote on this poll

Forum Jump: 
 17Likes
Reply
 
Thread Tools
post #1 of 61 Old 07-24-2014, 02:02 PM - Thread Starter
AVS Special Member
 
Scott Wilkinson's Avatar
 
Join Date: Sep 2001
Location: Burbank, CA
Posts: 1,292
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 303 Post(s)
Liked: 1079
Do You Prefer Active or Passive 3D Flat Panels?



Like it or not, 3D TVs are still with us, and many people like them. The question is, which type of glasses do you prefer?

Even though 3D seems to have come and gone in the home-theater market, it's not really gone—most manufacturers continue to make TVs with 3D capabilities (Vizio notwithstanding), many studios continue to produce 3D movies, and lots of home-theater owners enjoy 3D content. But until autostereoscopic displays become available to consumers, we're stuck with wearing glasses to watch 3D.

As you probably know, there are two types of 3D flat panels—those that quickly alternate the left and right images on the screen synchronized with active-shutter glasses, and those that use a film patterned retarder (FPR) to alternately polarize the odd and even lines on the screen, which are isolated for each eye using passive-polarized glasses. There are pros and cons with each technology.

Active-shutter glasses unequivocally provide full 1080p resolution to each eye, but they also block more light from reaching the eyes than passive glasses, so the image is typically dimmer. Also, many people complain about seeing a flickering effect with active glasses that is nonexistent with passive glasses, and active systems are more prone to crosstalk/ghosting. And don't forget that active glasses are more expensive than passive glasses, not to mention that active glasses are heavier, bulkier, and require replaceable or rechargeable batteries. On the other hand, while FPR displays often have a wider horizontal viewing angle, they have a much narrower vertical viewing angle. And they don't deliver full 1080p to each eye, though many people argue that the brain fuses the left and right images into a full-resolution 3D image.

So which 3D flat-panel technology do you prefer—active-shutter glasses or passive glasses? Or do you hate 3D in the first place, so neither option is appealing?

Like AVS Forum on Facebook
Follow AVS Forum on Twitter
+1 AVS Forum on Google+

Scott Wilkinson
AVS Editor
Scott Wilkinson is offline  
Sponsored Links
Advertisement
 
post #2 of 61 Old 07-24-2014, 02:12 PM
Advanced Member
 
dougri's Avatar
 
Join Date: Oct 2006
Posts: 933
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked: 35
What about "3D begs a big screen, give me a 3D DLP projector" ?
GreySkies and LDizzle like this.

"A wide screen just makes a bad film twice as bad. "
-Samuel Goldwyn

I wonder what he'd think about 3D IMAX?
dougri is offline  
post #3 of 61 Old 07-24-2014, 02:20 PM
Senior Writer @ AVS
 
imagic's Avatar
 
Join Date: Dec 2005
Location: Philadelphia, PA
Posts: 6,025
Mentioned: 28 Post(s)
Tagged: 0 Thread(s)
Quoted: 1447 Post(s)
Liked: 2727
I'm voting active until such a point in time that I see a UHD/4K passive TV capable of full-resolution 1080p 3D. That's what I get with active glasses and my plasma, and it is the best 3D I have seen so far. I think passive is more comfortable, but active takes greatest advantage of a given TVs resolution.

Find out more about Mark Henninger at www.imagicdigital.com
imagic is offline  
post #4 of 61 Old 07-24-2014, 03:21 PM
Member
 
hugabone's Avatar
 
Join Date: Jun 2002
Posts: 149
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Liked: 12
My 65" passive 4K Sony delivers full HD in 3D to each eye. I do have two other TV's that use active technology and prefer passive. Now on the 1080P passive screens that I have seen produced horizontal lines and the picture wasn't sharp so I didn't care for those.
hugabone is offline  
post #5 of 61 Old 07-24-2014, 03:25 PM
Advanced Member
 
mightyhuhn's Avatar
 
Join Date: Nov 2013
Posts: 639
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 264 Post(s)
Liked: 90
i only care about anime so 3d is totally useless to me and wouldn't watch any movie in 3d.
mightyhuhn is online now  
post #6 of 61 Old 07-24-2014, 03:28 PM
Member
 
Barrettmr's Avatar
 
Join Date: Feb 2006
Posts: 123
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 28 Post(s)
Liked: 18
I find my 3D LG Passive 3D has less flicker and so is nice to watch compared to my Epson 5020 3D projector BUT the bigger screen (132") is much better than the 50" TV for 3D, so we only really watch 3D in the theater room now and we love it!!! When there is a 3D option for a new movie we buy and watch that vs, the 2D but if all movies came out in 3D we may re-think it a little... I like to have a mix of 3D and 2D movie watching...
Barrettmr is offline  
post #7 of 61 Old 07-24-2014, 03:36 PM
Advanced Member
 
mogrub's Avatar
 
Join Date: Feb 2007
Location: Merica
Posts: 501
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 91 Post(s)
Liked: 111
We enjoy 3D a lot, and use both active and passive in different rooms. We don't have a significant preference between active vs. passive, although active probably gets a slight nod on perceived PQ. I think that may be more of an overall display-driven preference than it is a glasses-driven preference.

But when young kids are slapping on our 3D glasses, we have a strong preference for passive. Easier to clean, and cheaper to replace.


Every once in a while, quite inexplicably, things actually go according to plan.
mogrub is offline  
post #8 of 61 Old 07-24-2014, 03:55 PM
AVS Special Member
 
Mattopotamus's Avatar
 
Join Date: Nov 2012
Posts: 1,258
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 561 Post(s)
Liked: 265
Quote:
Originally Posted by imagic View Post
I'm voting active until such a point in time that I see a UHD/4K passive TV capable of full-resolution 1080p 3D. That's what I get with active glasses and my plasma, and it is the best 3D I have seen so far. I think passive is more comfortable, but active takes greatest advantage of a given TVs resolution.
You need to check out the Sony 65x900a. Passive 3D with full 1080P. The f8500 is the best active I have ever seen though.
mike_carton likes this.
Mattopotamus is offline  
post #9 of 61 Old 07-24-2014, 04:35 PM
Advanced Member
 
6athome's Avatar
 
Join Date: Mar 2006
Posts: 670
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 47 Post(s)
Liked: 41
I voted passive but The TV I have is active(LG LV 9500).My wife get a headache and active tier my eyes out.
My 55 inch tv is too small for 3D! you don't have that full theater effect.
Peripheral vision is not there on a small screen,this lessons the 3D effect.
6athome is offline  
post #10 of 61 Old 07-24-2014, 04:58 PM
Advanced Member
 
Daniel Chaves's Avatar
 
Join Date: Sep 2012
Location: LA (Valley Village)
Posts: 756
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 39 Post(s)
Liked: 62
okay I own a projector so I have to use active BUT now with 4k, I think Passive is going to be the way to go (until glasses free is perfected and reasonably priced).

Daniel Chaves is offline  
post #11 of 61 Old 07-24-2014, 07:10 PM
AVS Special Member
 
GregLee's Avatar
 
Join Date: Jul 2002
Location: Waimanalo HI
Posts: 3,249
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 165 Post(s)
Liked: 78
I've had 3 active 3D TVs, but I haven't seen a passive 3D TV home display. I've only seen the DirecTV side-by-side 3D on my 4k Samsung HU8550, active display, but it looks pretty good. It's bright enough, while my other TVs have been very dim showing 3D. I've never noticed the flickering that was mentioned.

Greg Lee
GregLee is offline  
post #12 of 61 Old 07-24-2014, 07:41 PM
Member
 
richierich93's Avatar
 
Join Date: Dec 2013
Posts: 30
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 16
active just has a much cleaner image when viewing 3D than Passive. Just view nearly any Samsung display in 3D and you will know what I'm talking about. Panasonic Plasmas don't look all that terrible even though I recall hearing that Panasonic Active displays somehow cut down the resolution in order to compensate for picture quality. Passive might be more comfortable, but unless its on a UHD TV, I will stick with Active 3D.
richierich93 is online now  
post #13 of 61 Old 07-24-2014, 07:56 PM
Senior Member
 
Karp's Avatar
 
Join Date: Oct 2004
Location: Pennsylvania
Posts: 410
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 20
I realize that passive does not technically provide simultaneous 1080P 3D, but at 60 or more fps, it is difficult for your brain to tell the difference. I find the smoothness of passive to outweigh the flickering and the heavier glasses for active. Not to mention the glasses are dirt cheap (or free if you keep them when watching a 3d movie at the theater). It is one of the reasons I chose my 70" Sony over comparable active 3d TVs.

No matter where you go, There you are ;)
Karp is offline  
post #14 of 61 Old 07-24-2014, 08:34 PM
Senior Member
 
hdnewbie21's Avatar
 
Join Date: Dec 2008
Location: Loud City
Posts: 288
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Liked: 38
Neither. 3D is too distracting, takes you away from the actual movie. It's fun for shorts like Disney World's 3D showings: Shrek, Captain EO, etc, but not for an actual movie. Moreover, LCD TVs have not mature, they are plagued by trade offs and manufacturers investments have gone to features rather than picture quality, driving the price up. Thankfully Vizio has decided to focus on improving picture quality, hopefully Samsung, LG and Sony follow.

Yamaha RX-V673 | HSU HC-1 MK2 | HSU HB-1 MK2 - LR | Pioneer SP-BS22-SLR | BIC RtR-V44-2 (Presence)
hdnewbie21 is online now  
post #15 of 61 Old 07-24-2014, 08:36 PM
AVS Special Member
 
fatuglyguy's Avatar
 
Join Date: Dec 2007
Location: Mars
Posts: 1,379
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 41 Post(s)
Liked: 107
for a 1080p tv: active, no question. The black lines are terribly noticeable and looks DVD-quality to me.
on a UHD set: passive, since I can't perceive any resolution loss compared to UHD active. I compared the 3D between a 65X850B and 900B and the 850 had a better 3D image.

ht Panasonic 60" ZT60, Monitor Audio: Silver RX6, RX Centre, Radius 90HD; Martinlogan Dynamo 700, Marantz SR5006, PS3, Oppo BDP-103D
2ch Sony KDL-32W650A, Sonus faber Toy Monitor, REL T3, Marantz PM8004, Sony BDP-S1000ES, JVC T-X3 tuner, Apple TV, Peachtree Audio DAC•iT, Sennheiser HD598
pc Energy CB-5, Audioengine D1, FiiO A1
fatuglyguy is online now  
post #16 of 61 Old 07-24-2014, 11:08 PM
Advanced Member
 
PlayNice's Avatar
 
Join Date: Oct 2012
Location: Seattle
Posts: 633
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 88 Post(s)
Liked: 120
I have an 80" TV passive 3D set and sit 10 feet from it, at that distance I do not notice the so called lines of passive 3D. I want 3D to be here to stay! Soon we will have glasses free 3D and that will be awesome!!!
xvader likes this.
PlayNice is offline  
post #17 of 61 Old 07-25-2014, 12:42 AM
Member
 
MLXXX's Avatar
 
Join Date: Jan 2007
Location: Brisbane, Australia
Posts: 179
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
Liked: 27
Quote:
Originally Posted by hugabone View Post
My 65" passive 4K Sony delivers full HD in 3D to each eye. I do have two other TV's that use active technology and prefer passive. Now on the 1080P passive screens that I have seen produced horizontal lines and the picture wasn't sharp so I didn't care for those.
I am in exactly the same situation, and agree. Full HD passive screens are a compromise. The passive 2013 model 65" 4K Sony avoids visible thin horizontal black lines, giving an excellent 3D picture. [The 2013 55" 4K passive Sony TV on the other hand uses a coarser film-type patterned retarder.]


Another issue is that in Europe and Australia when showing 50Hz sport in 3D (e.g. for the 2012 London Olympics), shutter glasses usually slow down to 100Hz (rather than using the 120Hz alternation rate they typically run at for 60Hz sport, or a 24Hz movie Blu-ray).

Alternation at only 100Hz can lead to a noticeably out of phase condition as between the left and right views. For me it often gives a distracting liquid look, similar to looking through hot air above a hot road, or a fire; a "mirage effect". There is no such out of phase effect visible with passive screens. Left and Right are displayed simultaneously, in phase. For me, the 3D image has a more "solid" look.

At a RealD cinema, the triple flash (left-right-left-right-left-right) for each 24fps frame requires an alternation rate of 144Hz. I find it is very rare for me to notice any mirage effect with RealD cinema.

Last edited by MLXXX; 07-25-2014 at 03:06 AM.
MLXXX is offline  
post #18 of 61 Old 07-25-2014, 05:27 AM
Advanced Member
 
kreeturez's Avatar
 
Join Date: Apr 2013
Posts: 557
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 130 Post(s)
Liked: 163
Do You Prefer Active or Passive 3D Flat Panels?

Speaking for 1080p (not 4K) setups, they both have uses in different use cases.

When I compare my passive 1080p 3D TV - even at it's relatively small sub-50" size - to any active display - the PQ differences are very, very noticeable due to the odd/even lines being filtered out by the passive glasses.
It most noticeable in a side-by-side comparison.
Compared, there's a definite loss in sharpness with passive when viewing 1080p 3D compared to active.

On the flip-side of the argument, though, my active-3D projection setup - despite supporting triple-flash with bluray (or any 24p) content - does still produce a bit of flicker that definitely makes it more fatiguing than passive. It's fine for the odd 3D movie (and the immersiveness makes up for it) - but I certainly wouldn't elect to use active over passive for a movie marathon. For the kids, passive is also the clear winner due to their higher susceptibility to eye fatigue.

This, coupled with relatively pricey active glasses - then for a family viewing night, I'd say they both end up coming up almost even when all their pros and cons are weighed up.

Active 1080p provides higher quality at a higher price. Passive 1080p provides higher comfort at a lower price.

BenQ W1070 Projector; Xtreamer Ultra 2 (running XBMC on OpenELEC) via Sony STR-DH540 AVR with Boston Acoustics SoundWare XS SE 5.1 Audio. MediaBrowser3 for Mobile Streaming.

Helpful post? Click the 'Like' button!
kreeturez is offline  
post #19 of 61 Old 07-25-2014, 07:11 AM
AVS Special Member
 
vaktmestern's Avatar
 
Join Date: Jun 2011
Posts: 1,149
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 237 Post(s)
Liked: 159
Since acrive 3D is so from brand to brand ... on flicker n crosstalk .. i go passive of the ease n no flicker effect.
vaktmestern is offline  
post #20 of 61 Old 07-25-2014, 07:25 AM
AVS Special Member
 
javanpohl's Avatar
 
Join Date: Jul 2006
Posts: 1,063
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 102 Post(s)
Liked: 106
Active. I think the 3d on my DLP projector is better than 99% of what I see in the theaters. The one exception being maybe a local ETX theater.
javanpohl is offline  
post #21 of 61 Old 07-25-2014, 09:18 AM
Advanced Member
 
PlayNice's Avatar
 
Join Date: Oct 2012
Location: Seattle
Posts: 633
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 88 Post(s)
Liked: 120
Quote:
Originally Posted by MLXXX View Post
I am in exactly the same situation, and agree. Full HD passive screens are a compromise. The passive 2013 model 65" 4K Sony avoids visible thin horizontal black lines, giving an excellent 3D picture. [The 2013 55" 4K passive Sony TV on the other hand uses a coarser film-type patterned retarder.]


Another issue is that in Europe and Australia when showing 50Hz sport in 3D (e.g. for the 2012 London Olympics), shutter glasses usually slow down to 100Hz (rather than using the 120Hz alternation rate they typically run at for 60Hz sport, or a 24Hz movie Blu-ray).

Alternation at only 100Hz can lead to a noticeably out of phase condition as between the left and right views. For me it often gives a distracting liquid look, similar to looking through hot air above a hot road, or a fire; a "mirage effect". There is no such out of phase effect visible with passive screens. Left and Right are displayed simultaneously, in phase. For me, the 3D image has a more "solid" look.

At a RealD cinema, the triple flash (left-right-left-right-left-right) for each 24fps frame requires an alternation rate of 144Hz. I find it is very rare for me to notice any mirage effect with RealD cinema.
RealD Cinema is actually the same tech that passive at home uses, in fact you can even use the same glasses at home and in the theaters.
PlayNice is offline  
post #22 of 61 Old 07-25-2014, 10:41 AM
Member
 
mercennarius's Avatar
 
Join Date: Oct 2013
Posts: 102
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 14
Passive. My LG 55GA7900 looks great. Not to mention substantially cheaper glasses and less eye fatigue.
mercennarius is offline  
post #23 of 61 Old 07-25-2014, 01:38 PM
Advanced Member
 
rekbones's Avatar
 
Join Date: Jan 2012
Location: Somers, CT
Posts: 572
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 34 Post(s)
Liked: 51
Quote:
Originally Posted by PlayNice View Post
RealD Cinema is actually the same tech that passive at home uses, in fact you can even use the same glasses at home and in the theaters.
This is not true RealD is actually closer to an active display than passive, the shutters are on the projector instead of your glasses. Imax on the other hand is true passive as both left and right images are displayed at the same time from two projectors.

I voted passive from a panel TV, its just more convenient for a family with kids, cheaper glasses ect. I own a Panasonic ST60 that is active but have only viewed 3D for a few minutes its just not worth it for me. My DLP projector is just so far ahead of any of the panel TV's.

Smart enough to know better, to old to care
rekbones is offline  
post #24 of 61 Old 07-25-2014, 02:21 PM
Member
 
dhvsfan's Avatar
 
Join Date: Jul 2004
Location: Planet Earth
Posts: 76
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
I voted for the Active 3D. I have a LaserVue DLP set and have had no issues with cross-talk or eye fatigue. Those who have come over for a 3D movie night, typically comment that it is better than the theater 3-D.


The downside is that the glasses are heavy and my nose starts hurting after awhile. Mostly when playing 3D video games. But also two 3D movies in a row (try three and your nose really hurts)

Nothing in this posting/signature really means anything in the long run.
dhvsfan is offline  
post #25 of 61 Old 07-25-2014, 02:35 PM
AVS Special Member
 
Mattopotamus's Avatar
 
Join Date: Nov 2012
Posts: 1,258
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 561 Post(s)
Liked: 265
Both active and passive have come such a long way. If 3D started the way it is today, there is no question it would be very popular at home. The level of depth and immersive experience it creates takes movie watching to a whole new level.
imagic, Pixel Dude and LDizzle like this.
Mattopotamus is offline  
post #26 of 61 Old 07-25-2014, 03:44 PM
AVS Special Member
 
LowellG's Avatar
 
Join Date: Aug 2004
Location: Helotes, TX
Posts: 1,431
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 94 Post(s)
Liked: 89
Quote:
Originally Posted by imagic View Post
I'm voting active until such a point in time that I see a UHD/4K passive TV capable of full-resolution 1080p 3D. That's what I get with active glasses and my plasma, and it is the best 3D I have seen so far. I think passive is more comfortable, but active takes greatest advantage of a given TVs resolution.
That's my vote too.

Lowell


The MARVELous Home Theater: http://www.avsforum.com/forum/19-ded...e-theater.html
LowellG is offline  
post #27 of 61 Old 07-25-2014, 04:51 PM
Member
 
Mattyo1612's Avatar
 
Join Date: Apr 2012
Location: Mackay Queensland Australia
Posts: 91
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Liked: 22
Active 3d is better as far as picture quality goes but my eyes get tired if I watch two 3d movies back to back but passive is more comfortable and less eye strain

Mattyo1612 is offline  
post #28 of 61 Old 07-25-2014, 07:04 PM
Member
 
MLXXX's Avatar
 
Join Date: Jan 2007
Location: Brisbane, Australia
Posts: 179
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
Liked: 27
Quote:
Originally Posted by PlayNice View Post
RealD Cinema is actually the same tech that passive at home uses, in fact you can even use the same glasses at home and in the theaters.
Yes cinema RealD glasses use the same type of polarisation (circular) but that's where the similarity ends. At the technical level, as rekbones has mentioned, watching RealD at the cinema is closer to watching a TV panel that requires active shutter glasses, than watching a passive 3D panel.

The RealD technology involves rapid alternation between showing left and right. The alternation in polarisation occurs at the projector. This means there is a slight timing discrepancy between the time your left eye sees the left image and your right eye sees the right image. Because of the use of a relatively high alternation rate (144Hz), most people don't seem to notice the alternation. I notice it very rarely; as a liquidy, mirage-like effect.

Last edited by MLXXX; 07-25-2014 at 11:48 PM.
MLXXX is offline  
post #29 of 61 Old 07-26-2014, 12:10 AM
Advanced Member
 
PlayNice's Avatar
 
Join Date: Oct 2012
Location: Seattle
Posts: 633
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 88 Post(s)
Liked: 120
Quote:
Originally Posted by rekbones View Post
This is not true RealD is actually closer to an active display than passive, the shutters are on the projector instead of your glasses. Imax on the other hand is true passive as both left and right images are displayed at the same time from two projectors.

I voted passive from a panel TV, its just more convenient for a family with kids, cheaper glasses ect. I own a Panasonic ST60 that is active but have only viewed 3D for a few minutes its just not worth it for me. My DLP projector is just so far ahead of any of the panel TV's.

I was under the impression the shutters used in RealD cinema is used to aid in viewing comfort and it is not used to transmit 3D the silver screen is used to reflect the proper polarization off the screen.

Is this not true?
PlayNice is offline  
post #30 of 61 Old 07-26-2014, 01:19 AM
Member
 
MLXXX's Avatar
 
Join Date: Jan 2007
Location: Brisbane, Australia
Posts: 179
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
Liked: 27
PlayNice, the issue I raised back at post 17 was the lack of timing phase accuracy with active glasses 3D as between the presentation of the left and right images to the left and right eyes. I went on to mention that that issue also arises with RealD cinema where the effect is less as RealD uses a 144Hz alternation rate whereas regular plasma and LED shutter glasses typically use 120Hz for movies, and in Europe/Australia typically use 100Hz for televised sport.


There is no dispute that RealD cinema requires circularly polarised passive glasses (the same as typical passive 3D LCD televisions) as well as a suitably reflective (silver) screen to maintain the differing polarisation as between left and right content coming from the projector. The issue I raised had to do with a timing discrepancy between left and right content as viewed by the human being. The timing discrepancy arises because the projector can project either left or right, but not both, at any instant in time. It uses what is known as a triple flash for each of the 24 frames per second; three flashes of left and three flashes of right: left, right, left, right, left, right.


As far as the human being in the cinema seat viewing the movie is concerned, RealD cinema is akin to plasma TV active glasses 3D but at a higher alternation rate (144Hz vs 120Hz). It is not like watching a passive LCD panel at home where the left and right images are perfectly in phase with each other.
PlayNice likes this.

Last edited by MLXXX; 07-26-2014 at 01:39 AM.
MLXXX is offline  
Reply Community News & Polls

Tags
frontpage , Polls

User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off