Talk:Wobulation

If this isn't just a front for the Hewlett-Packard puiblicity release posing as an external link, perhaps it's a redirect. --Wetman 04:04, 30 Apr 2005 (UTC)

entry is not just publicity

I wrote the main body of this entry about a month ago when I was unable to find a reliable entry for wobulation on Wiki or anywhere else really. Some of the information is from the HP website, but most of it is compilated from other articles. I'm a wikipedia rookie so I don't know how to add some of the more helpful features like photos, but I just wanted to have a good basic layout of what wobulation is. The original entry was high up on the google hit list but was inaacurate and worthless so I changed it. And no I'm not a marketing plant, I'm just a tech guy who wanted to add something valuable to the wiki. I tailored the entry to those doing research for a TV purchase since that seemed to be the people wo would be most interested in wobulation. There is a lot of misinformation out there, and the tech is complicated so if anyone can shine a better light on it then I certainly welcome that. But I am watching this page to make sure that it does not become a love/hate fest of competeing display technologies. -- FlashGordon

So what is the difference between wobulation and interlaced video? --Damian Yerrick (talk | stalk) 21:09, 21 March 2007 (UTC)

What would be a typical frequency? Do pixels wobulate in sync? Does it produce similar artifacts as interlacing?

I'd just like to note that as of 25th March 2008, none of the links work. Elvum (talk) 17:16, 25 March 2008 (UTC)

Correct me if I am wrong, but here is what I THOUGHT I knew about wobulation. I'm going to write like I "know" what I'm talking about so I'm not constantly writing "I thought this," and "I thought that." So take this whole thing as "I thought..." Wobulation does not increase resolution - it increases picture size. It does not "overlap" pixels. It does not interlace pixels. The DMD chips produced by TI have half the mirrors necessary to produce the 480, 720 and 1080 HD resolutions. The mirrors are so fast they can produce more than twice the number of images-per-second necessary to take advantage of persistence of vision. To save on manufacturing costs most televisions using DLP technology implement only one chip that produces one-half of the screen at a time, and the human brain "sees" both halves as one, larger image. This is not done like interlacing where there are odd and even lines. This is done by producing one left and one right image from the same chip at separate moments in time. Keep in mind the DMD chip is already producing 4 individual images anyway (one red, one green, one blue, one white), so with wobulation the chip now produces 8 total images for each frame, left & right green, left & right red, left & right blue, left & right white. The extra white image is for enhanced brightness. The white is not always implemented. There are two sources of light primarily in use today: a color wheel and solid-state. Color wheels use one, bright-white light and a disc which spins in front of it to make up the 4 color (RGBW). The light is directed to the DMD whose mirrors' tilt determines the amount of that color that is projected for that particular pixel. In a solid-state source, the color wheel and white-bulb are replaced by 3 or 4 LEDs. The white can be produced (if used) by all three RGB LEDs lighting simultaneously, or by a separate, white LED. Some DLP sets are a "hybrid" of these two and are often referred to as "LED drive." This simply means that a white LED replaces the white bulb, but the color wheel still exists. The advantage is longer light-source life. Bulbs will last the average use 1-3 years while an LED will outlast the technology cycle and be good for anywhere from 10-50 years, and speculation is even longer than that. It's hard to tell since LED technology keeps evolving faster than we can test for lifetime. Some sets listed as "LED drive" are actually also the solid state version without a color wheel as solid state is a confusing term for many, even tech-savvy folks. Solid state simply means "no moving parts." (Well, the electrons still move).

This is not the greatest source of information in the world, but it is generic, discusses all technologies, and leaves no preference. It's coverage of LED-driven and solid-state-drive DLPs is paltry because of its age. Rainbow effect is eliminated in true solid-state-drive DLPs. CNET HDTV Tech Comparison

I have read on a message board that newer sets are implementing two chips instead of one to eliminate wobulation. IMHO it's probably not true as this is a HUGE waste of money. The human eye can not and will not sense the difference.

On the issue of softness: DLP is a naturally soft technology. Although there is a discrete pixel at the chip level, it is a projection-only technology, and not onto phosphor, so there is not discrete pixel on the projected image level. Trust me, I've look at my set with a magnifying glass - you just don't see "pixels" period. Even without wobulation you will get this effect from DLP. Wobulation does not contribute nor detract, or in any way affect the softness of the image.

I'll look for my sources. Right now I AM my source, but I can't quote me. This was based off the research I did before deciding on an HDTV technology. I researched DLP heavily and all of my above "thoughts" are based on my "flawless" (cough cough) memory. forgive me if I am wrong, and I will try to track down sources to back me up b4 editing the actual article. Omalley576 (talk) 16:40, 6 February 2009 (UTC)

Dithering?

The following comment was added to the main article: "This sounds like dithering to us." I moved it here. Looking at the Dithering article, it looks like dithering originally meant applying a random signal to reduce quantization; however, it has now come to mean any method to reduce quantization. Acertain (talk) 15:03, 21 May 2011 (UTC)

Digilens T-Rex system is a huge breakthrough

It would be an excellent addition to mention the Digilens T-Rex system that Meta Platforms are using in prototype VR headsets. EditorPerson53 (talk) 08:30, 13 April 2022 (UTC)