Mitsubishi DLP RP WD73833 - comments

princetonr · Post by **princetonr** » Sun Nov 18, 2007 8:57 am

I have been a long time Sony owner, currently looking to update my KDP65XBR2. Sony's new 70" XBR5 is not due until sometime next year. I have heard rumors that the RPTV market is dwindling and Sony may drop the 65/70 SXRD RPTV due to the sagging sales. Anyway, I was looking at the Mit WD73833. I am concerned on the fan noise and other forums have discussed the wobulation/geometry of the unit. Does anybody have comments/reviews of this unit?

Richard · Post by **Richard** » Sun Nov 18, 2007 11:10 am

I am concerned on the fan noise and other forums have discussed the wobulation/geometry of the unit.

They, lamp based rear projectors - RP, all have fans and they all make some noise... I doubt this will an issue with the sound track. Bear in mind with any technology that has some noise that walls and enclaves can act like sound boards reinforcing the noise making it louder than it actually is.

Wobulation is part and parcel of ALL DLP RP product so it's not like you have a choice.

Geometry - bowing of outside vertical lines with 4:3 content? All MD RP technology does that as well, not just DLP. There is nothing you can do because it is part and parcel of any short throw lens.

The new Mits does have an internal feature setup by the factory to remove the slight bow but it destroys the 1:1 pixel map. For sheer performance you would have this TV calibrated, the feature turned off and live with the slight bow.

stewa348 · Post by **stewa348** » Wed Dec 19, 2007 12:54 pm

Richard wrote: Wobulation is part and parcel of ALL DLP RP product so it's not like you have a choice.
.

This DLP model has a 1080p chip. No wobulation.

Richard · Post by **Richard** » Thu Dec 20, 2007 3:54 pm

I don't know why you would say that... the wobulation mirror sits right under the output lens...

Not everybody is going to state that in their specs - none the less this one is wobulated as all are these days.

stewa348 · Post by **stewa348** » Fri Dec 21, 2007 7:34 am

I'll be darned. They had me fooled. How do they get away with calling the tv "true 1080p"? Oh wait, it's because they are not saying true 1920X1080?
Thanks

Richard · Post by **Richard** » Sat Dec 22, 2007 7:49 am

I hear you and your concerns. That said wobulated DLP is just as effective if not beating some/all of the competition in terms of resolution response in the RPTV category. A true 1920x1080 chip does have more clarity than wobulated and DLP remains the projection detail leader.

Rodolfo · Post by **Rodolfo** » Sun Dec 23, 2007 10:52 am

I agree with Richard.

Every time I get together with TI they claim that although they can supply non-wobulated DMDs for RPTVs the manufacturers have to request it and is a business decision that affects also the light engine parts not supplied by TI, so it seems everyone is satisfied with 1080x960 at 120Hhz for now, and RPTV is on its way down, so I do not see that changing. TI dislikes everytime I use the term "wobulated", and I love it, so I use the term intentionally.

The 1080p standard is only 1920 "displayed at certain frame rate", so in theory two 960s displayed within the same time period of true 1920 seem to qualify in their books, not in mine though, I never accepted that technology workaround, especially when the chips are already created, but it all becomes a cost savings issue on RPTV. This type of sets made themselves a place in the industry because they offer large screens at rock bottom prices, I am discounting LCD RPTV due to its subpar image quality at not too far price difference.

Ironically, the wobulated chip has now reborn itself as an opportunity for 3D on existing sets, but one has to take a look at the drastic reduction of perceived light output on those images to realize that this is just another opportunity to perpetuate a shortcut technology of TI, squeezing the last dollar out of the idea of 1080x960.

One has to realize that TI does not create chips in a vacuum, their clients (manufacturers) drive the demand, and consumers looking for lower prices in large screens drive the demand of their demand.

Best Regards,

Rodolfo La Maestra

DLPDude · Post by **DLPDude** » Mon Dec 24, 2007 8:06 am

A little help here please. I have a 2 year old Samsung HLS5679 DLP RP with LED Light source. This set is sold as full 1080P (1920x1080) 2 million pixels.

My understanding of this design is that there is no rotating color wheel, no hi intensity projection lamp and that the projection LED's (PhlatLight) are digitally controlled for color and brightness.

Are you saying that this set has "wobulation"?

Also, could you give a brief description of wobulation?

Many Thanks,
DLPDude

Rodolfo · Post by **Rodolfo** » Mon Dec 24, 2007 10:36 am

DLPdude,

The answer to your question is YES, all 1080p DLP RPTVs do wobulation, a term more related to HP than TI. In the other hand, the newer 1080p front projectors use a full array of 2 million+ mirrors (1920x1080) in their DMDs.

Having a color wheel or not is part of how the light engine was implemented by the manufacturer, not the DMD chip supplied by TI.

As you requested, you will find a brief explanation of "wobulation" in the DLP section of the 2005 HDTV Technology Review report of 2005, pages 49 and 50:

http://www.hdtvmagazine.com/reports/hdt ... review.php

You can always consult Wikipedia they have an entry for that term.

Best Regards,

Rodolfo La Maestra

DLPDude · Post by **DLPDude** » Tue Dec 25, 2007 6:07 am

"Many Thanks" for your reply Rodolfo.

DLPDude

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Mitsubishi DLP RP WD73833 - comments

Mitsubishi DLP RP WD73833 - comments

Wobulation?

Wobulation?...