1920X1080 DLP

Guest · Post by **Guest** » Sat May 01, 2004 12:23 am

April 27 2004 at 6:07 PM
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Looks like a 1920x1080 DLP chip is expected to be available late this year. Might give the venerable CRT RPTVs a run for their money. See the xHD3 chip down the page at:
http://www.digiupdate.com/105_DLP_RPTV. ... oc62794043

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Allen
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Re: 1920X1080 DLP
No score for this post April 28 2004, 6:33 AM

Just saw the writeup on how this new xHD3 chip works for 720p and 1080p. New twist on interlaced/progressive scan.

This chip paints one half of the screen (left/right alternately) every 1/120th of a second, so you get a full screen every 1/60th of a second. For 1280 x 720 it paints 640x720 each time. For 1920x1080 it paints 960x1080 each time.

Interesting solution. Throws a new twist into the interlaced/progressive scan debate.

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Richard Fisher
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Re: 1920X1080 DLP
No score for this post April 28 2004, 7:04 AM

Allen,

Digital displays do not write anything across anything, that is an anolog function of CRT. They are flash displays where the complete frame is displayed.

Can you direct me to this info you are referring to?

Thanks,

Richard F. Fisher
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Allen
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Re: 1920X1080 DLP
No score for this post April 28 2004, 8:59 AM

Sorry, Richard. I tend to use the term 'paint' loosely and I shouldn't.

The writeup was in the new TPV (The Perfect Vision magazine).

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Richard Fisher
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Re: 1920X1080 DLP
No score for this post April 28 2004, 9:40 AM

We have been misled...

What else is new?

The new TI chips are NOT 1920X1080 but 960X1080 using the same interlace shift concept but in the horizontal plane. Very disappointing from a pure science aspect. While it does remove vertical interlace problems what others will be generated by this scheme? A moot question until we have them in our hands.

I will see if our resident equipment and technology guru Rodolpho has any input.

Richard F. Fisher
Have you been calibrated? ISF and HAA Trained
Mastertech Repair Corporation, Lawrenceville, GA
770-513-3987 E-Mail - [email protected]
Factory Authorized Service
Mitsubishi, Hitachi, Toshiba, Harman Kardon, Infinity, JBL
Lumagen Scaling and Bravo D1 Dealer

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Allen
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Re: 1920X1080 DLP
No score for this post April 28 2004, 10:24 AM

I wonder if the fact that it can do both sides of the screen in 1/60th of a second will make a difference (1/120th for each half)? With current vertical interlacing it takes 1/30th of a second, so at least this is twice as fast.

The TPV guys seemed as surprised as anybody about this disclosure - they were apparently expecting a true 1920x1080 as well.

Thank god I'm not a videophile. This stuff is technically interesting to me but doesn't really bother me from a consumer standpoint. Sometimes ignorance truly is bliss.

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Richard Fisher
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Re: 1920X1080 DLP
No score for this post April 28 2004, 10:32 AM

>>Thank god I'm not a videophile.

Allen, you sure know enough to be one...

The test on this display will be vertical pans rather than horizontal.

This message has been edited by mastertechtv on Apr 28, 2004 10:38 AM

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Allen
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Re: 1920X1080 DLP
No score for this post April 28 2004, 12:10 PM

I guess you could call me an information-phile. I just have to know how things work and why. But when it comes down to audio and video performance I'm just not that picky. I work with 2 audiophiles and they are NEVER happy - they're in a never ending quest for perfection that they'll never achieve. But that won't stop them from spending thousands of dollars trying. You reach a point where the quality really doesn't get better - it just gets different.

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Richard Fisher
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Re: 1920X1080 DLP
No score for this post April 28 2004, 12:41 PM

>>You reach a point where the quality really doesn't get better - it just gets different.

Never thought about it that way. That is an astute observation!

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Ken - KQ6QV
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Re: 1920X1080 DLP
No score for this post April 28 2004, 6:29 PM

I

Hugh · Post by **Hugh** » Sat May 01, 2004 3:33 pm

What audible sound? Are saying there is a noise coming from the chip itself?

kq6qv · Post by **kq6qv** » Sat May 01, 2004 4:17 pm

No. If you construct a large mirror that moves 120 times per second, you have essentially built a speaker.

Hugh · Post by **Hugh** » Sat May 01, 2004 4:23 pm

Right, but this chip is only .55" square with 500,000 mirrors on it. It make no noise that I have ever heard.

kq6qv · Post by **kq6qv** » Sat May 01, 2004 4:39 pm

No, the interlace mirror is different from the chip. The interlace mirror is new for the 3-chip DLPs soon coming out. It moves the whole image right or left by 1 pixel.

Hugh · Post by **Hugh** » Sat May 01, 2004 5:50 pm

Now I know what you are talking about. I don't know the answer but I thought that mirror was stationary. In the example furnished by TI for the three chip version I don't see an interlace mirror.

akirby · Post by **akirby** » Sun May 02, 2004 7:35 am

Hugh wrote:Now I know what you are talking about. I don't know the answer but I thought that mirror was stationary. In the example furnished by TI for the three chip version I don't see an interlace mirror.

How can it be stationary? It has to move to shift the picture one pixel every 1/120th of a second. That's why it's there. That's why it's called the interlace mirror. Now it only moves one pixel but it still moves.

Richard · Post by **Richard** » Sun May 02, 2004 9:13 am

The only comment I will make is I have hard time seeing this mirror as something huge and would think it is inside the light engine cavity along with the imager.

Hugh · Post by **Hugh** » Sun May 02, 2004 2:33 pm

I'm still trying to find a mirror that could possibly make a noise having to do with this chip or the projection of the picture. If you go to the following TI site there is a good demo of how this all works:

http://www.dlp.com/dlp_technology/dlp_t ... erview.asp

From there you can download a zip file that will give you a large "picture" of the various parts. If there is a mirror, other than the ones on the chip, I would like for someone to tell me where it is located.

Richard · Post by **Richard** » Sun May 02, 2004 2:40 pm

Hugh,

That is based on the old stuff. I am not finding anything about the 1920X1080 imager.