Originally Posted by Aztar35
This machine, with its brightness and sharpness, will be great for multi use; but your point is precisely why I'd like to demo first to gauge RBE sensitivity. I noticed, however, many who have the LK970 and posted on this forum say it's a non-issue.
Some people do not perceive the rainbow effect or are not sensitive to it. However, this does NOT mean that it is a non-issue
Personally, even if I was fortunate to be one of those who does not see it or is not sensitive to it, I would not wish to have a home theater wherein out of my friends and family whom I invite into my home theater some of these most certainly will be seeing rainbows and it will ruin their experience and enjoyment.
So when we are talking about projectors costing thousands of dollars and home theaters costing even more than this, I am sorry but the potential for rainbows is wholly unacceptable to me. Wherein, I have a particular loathing of the particular 0.67" Single-Chip DLP chipset from Texas Instruments (TI) that is being used in all these projectors. SIM2 include the same chip within their NERO4 projector that retails for 30,000 bucks, wherein the contrast is abysmal and of course it is afflicted with rainbows. I find this to be utterly ridiculous. And especially given that the phenomenon is so easily 100% eliminated entirely simply by using 3-Chip DLP chipsets instead of Single-Chip DLP.
Wherein, historically the issue has been the lack of availability of 4K 3-Chip DLP chipsets, but this is no longer the case. Recently, there has become available the native 4K 3-Chip DLP Chipset that has previously featured within cinema projectors, by Christie, Barco, and NEC; which previously was unavailable due to an exclusive license for those three companies, due to their co-financing the production of the chipset, but no longer; now anyone can purchase and use that chipset. So what I would really like to see is the likes of BENQ, as well as other projector manufacturers, such as SIM2, incorporating this chipset into their projectors, whether this is their business projectors that can be used for HT usage, or those actually designed for HT. This would eliminate the rainbow effect entirely.
Then the only other aspect that would need attending to is to make use of other technologies to boost the native ON/OFF contrast performance of these DLP chipsets.
Here's the thing... The potential of DLP exceeds that of LCoS. Wherein, if you remove rainbows out of the equation by going 3-Chip instead of Single-Chip DLP then the only remaining issue and hence the Achilles Heal is the contrast and resultant black levels performance. The ANSI is considerably higher with DLP than LCoS however ANSI in itself does not directly influence the black levels of actual video content aside from the few pixels of black directly adjacent to bright highlights. It is the particular ON/OFF contrast at the respective ADL within the range 0% - 20% that typically relates to circa 90% of video content, with the average luminance of movies being circa 10% ADL, and only circa 10% of content residing within the range 20% - 50% ADL, wherein ANSI = 50% ADL. Hence, the higher ANSI of DLP only really indirectly influences the black levels of video content, in that higher ANSI will typically mean that indirectly the measured contrast at 20% ADL will be higher, but it is the range 0% - 20% that is by far the most important; and this has been to date the reason why LCoS projector such as JVCs have been the king of contrast and black levels as far as consumer media / video content is concerned.
With respect to other areas that most influence good video image quality DLP significantly outperforms LCoS, and this includes sharpness, MTF, RGB convergence, video noise, image uniformity, and 3D performance, to name but a few. So, simply go 3-Chip DLP to eliminate the rainbows, then all that remains is to address the the Achilles Heal of poor ON/OFF contrast performance, then you will have projectors that will significantly outperform every single LCoS home theater projector currently available and in more ways than one.
Hence, high contrast performance with DLP is where DLP projector manufacturers really need to be investing their R&D resources.
We are now seeing for the first time examples of such high contrast 3-chip DLP projectors; however at the present time these are at the top of the top of the pyramid, being unaffordable by 99% of the population.
So what I would love to see would be BENQ and other home theater projector manufacturers moving beyond single chip DLP projectors with poor contrast and significantly elevated black floors, and to similarly develop home theater projectors that are both 3-Chip DLP and high contrast. All the jigaw pieces are just lying there... they only need to put them together to make home theater DLP projectors with video performance that considerably surpasses what any of these LCoS projectors are currently achieving. But as of right now, with rainbows and poor ON/OFF contrast performance these projectors are not so