CurtPalme.com Home Theater Forum

overclkr · Joined: 08 Mar 2006 Posts: 4227

overclkr · Joined: 08 Mar 2006 Posts: 4227

Oh and Avatar 3D KICKS ASS!

CIR Engineering · Posted: Wed Apr 27, 2011 5:47 pm Post subject:

Hi Guys,

I was in Yosemite National Park with my family all last week and was totally off the grid... no cell phone, no internet. And then I was busy working on some Titan DP projectors. I am starting to get caught up now with emails and phone calls so I can finally post.

CIR Engineering · Posted: Wed Apr 27, 2011 5:48 pm Post subject:

Also thanks to John, Cliff, Mike, atomiccow, and everyone else for their kind remarks and kudos. I really appreciate the kind words so thank you all Smile

craigr

CIR Engineering · Posted: Wed Apr 27, 2011 6:00 pm Post subject:

During my CRT open house a couple months back one pair of Samsung glasses got sat on and the lenses were crushed. Right before I went to California I opened them up, turned them on, and hooked up the O-Scope to examine the wave forms. I was surprised at what I found!

Here is the right eye wave form:

Here are the left and right eye wave forms on top of each other:

I find it interesting that the lenses go +10volts > zero > -10volts > zero > +10volts > zero > -10volts... I was expecting to see +10volts > zero > +10volts > zero +10volts > zero... I think Samsung must have done this because I suspect that this actually may allow the glasses to be more transparent when they are open at zero volts. I suspect that if the LCD crystals are aligned the same direction with the same voltage polarity on each cycle that they may not go back to clear as quickly each time. I bet that by changing polarity each cycle the lenses can get clearer and respond with less latency.

I also find it surprising that the open and closed period is the same. I thought that the voltage would be sent back to zero earlier than an exact fraction of 1/2 the period.

Anyone else have thoughts after seeing the photos of the scope?

craigr

bofr · Joined: 03 Feb 2008 Posts: 28

What exactly are you measuring? If it is the signal directly to the crystal shutter then an AC waveform is perfectly normal.

LCD shutters do not like dc....as in they get destroyed after a while.

The period seems a bit strange though, AC @ 500 hz or so is more normal for shutters.

Voltage on -> they are black, voltage off- transparent (for a fraction of a second).

/bofr

CIR Engineering · Posted: Thu Apr 28, 2011 11:59 am Post subject:

Yeah, that is voltage to the crystals and the timing is correct because I am running 96Hz video.

I just don't really know much about LCD shutters so I was surprised by the +/- voltages. With my lack of knowledge in this particular area I was expecting always + or always -. I was surprised, but it makes sense...

Learn something new every day Smile

craigr

JohnHWman · Posted: Thu Apr 28, 2011 12:52 pm Post subject:

Hello Craig,

As per your recommandations, I've ordered the new version of the 3D IR Transmitter (A3D_589) from "Ultimate 3D heaven source" :
http://www.ultimate3dheaven.com/3dtrformisa3.html
This one is cheap and I'll see...

I've also tested my SSG2200AR glasses on a 'regular' Samsung 3D LCD TV (120Hz) and they're working nice (you never know with Ebay sellers !). So I assume that this is either the GEN2 IR emiter issue or the 96Hz versus 120Hz issue. Like others, I've also discovered that GEN2 IR emitter action is corrupting all other IR transmission (HT remotes) while playing 3D content (you can't even pause a movie !) So I assume that either the TX power or the IR spectrum of the LEDs used on GEN2 may be too high/large for small HT rooms !

John

CIR Engineering · Posted: Thu Apr 28, 2011 1:12 pm Post subject:

bofr · Joined: 03 Feb 2008 Posts: 28

CIR Engineering · Posted: Mon May 02, 2011 11:59 pm Post subject:

I have been waiting for "Sanctum" to come out and now I see that the pre-order is up and posted on Amazon Smile

For those who don't know, this is another James Cameron film and from what I recall reading he used all the same camera equipment that he used on AVATAR. And man, AVATAR sure was eye candy in 3D. I am pre-ordering now by hopping through Curt's web page so that he gets his kickback Wink

craigr

CIR Engineering · Posted: Wed May 11, 2011 11:30 pm Post subject:

JohnHWman · Posted: Thu May 12, 2011 8:06 am Post subject:

Thanks for pointing this Craig !

I'm still waiting for my new version of the 3D IR Transmitter (A3D_589) from "Ultimate 3D heaven source" : (http://www.ultimate3dheaven.com/3dtrformisa3.html). They said that it has been shipped last week. This should arrive soon now.

Today I have one pair of SSG2100AB (working with GEN2), three pairs of SSG2200AR (non working with GEN2) and one pair of 3D Heaven Ultra-Clear HD Wireless 3-D Glasses that is comming with the new tiny IR emitter.

I hope the new IR emitter will solve all my issues with the glasses...

John

CIR Engineering · Posted: Thu May 12, 2011 10:05 am Post subject:

CIR Engineering · Posted: Thu May 12, 2011 2:03 pm Post subject:

Well here is a strange twist... out of the 30+ pair of Samsung glasses I just got in, one of the pair labeled "(Minus: -)" actully does work with the GEN2, but the other 30+ pair do not. All of the pair labeled with just "-" work with the GEN2.

So I guess some of the "(Minus: -)" pair may work with the GEN2, but what I have here is less than 1/30.

craigr

JohnHWman · Posted: Thu May 12, 2011 6:20 pm Post subject:

Craig, I've checked my own pair of SSG2100AB battery inner PCB and it is written a large "-". This one is working with the GEN2.
John

JohnHWman · Posted: Sat May 14, 2011 2:08 pm Post subject:

Well,

I finally received my new version of the 3D IR Transmitter (A3D_589) from "Ultimate 3D heaven source" : (http://www.ultimate3dheaven.com/3dtrformisa3.html) with one pair of 3D Heaven Ultra-Clear HD Wireless 3-D Glasses.

The small A3D_589 IR transmitter is working really nice with Samsung glasses ! I just had to revert the 3D polarity from "+" with gen2 to "-" in Lumagen menu with this A3D_589. There is no IR power issue versus GEN2 : its two IR leds are providing enough IR for direct vision with glasses. Even reflecting those two IR leds to the display screen is still providing enough IR to the audience seated at 5m distance from the screen !

The pair of 3D Heaven Ultra-Clear HD Wireless 3-D Glasses is working also nice at 1280x720p96. However, I've think that these Samsung SSG2100AB copy is slightly slower than original because I've noticed that they exhibit some yellowish lines at the top of the 3D image that SSG2100 do not show. I tried to change the 3D signal delay on the lumagen without improvement.

I tested my three pairs of SSG2200AR (non working with GEN2) and they still don't work at all with A3D_589 IR emiter. I'm suspecting that they only work at 120Hz, not at 96...

You can go for the A3D_589 IR transmitter : it's a cheap but effective solution to work with Samsung glasses !!

John
PS : Craig, maybe the "MINUS" written SSG2100AB battery compartiment PCB may be unable to work at 96Hz (but work at 120Hz) while "-" version does Wink

Tim in Phoenix · Joined: 21 Oct 2006 Posts: 4409 Location: Phoenix

Guys

I expect that P43 green phosphor will become a requirement at 120hz refresh and continue to be helpful at 96hz based on my experience with stereo back twelve to fifteen years ago, or the prospect of lag problems will be an issue.

.

JohnHWman · Posted: Sat May 14, 2011 6:03 pm Post subject:

I agree Tim,

P43 fast green phosphor with proper C element filter is my next step for 3D. However, 120Hz full HD 3D would also require to improve the G90 VBW to 180MHz or more.

John

overclkr · Joined: 08 Mar 2006 Posts: 4227

Yeah but doesn't the P43 put out less light output?