One of the complaints about 3DTV that is often repeated in the press is that “there are no standards“. I may be the only one who does not see that as a major obstacle. After all, there are a lot of different digital image file formats out there, yet programs like Microsoft Word or most browsers seem to be able to handle all that variety without breaking a sweat.
Apparently, XpanD agrees with me. The company is a leading manufacturer of glasses for 3D movies and televisions, and have sold more than 2 million of their earlier model X101 active 3D glasses. They manufacture many of the glasses sold by the different TV companies for their 3D-capable TV sets. Each brand uses its own method of syncing with the glasses in order to deliver the stereoscopic images. And XpanD now makes an X103 universal model of the glasses that can respond to signals from all the different brands. Part of the motivation for this comes from the TV makers themselves, as well as retailers. Stores don’t want to have to stock 15 different models of glasses to work with 15 different brands; the X103 lets them stock one model of glasses for use with all the TVs. And since XpanD technology is used in more than 2,700 digital cinemas, people will be able to bring their own private glasses when they go to the movies. This could ultimately save the cinema’s the significant cost of providing glasses for all audience members. The company press release did not mention pricing, but did indicate that they intend to come out with 12 different colors (including the basic black, which goes with everything). Reader Commentarystevekaden • Mar 16, 2:24pm Just kidding...though I'd expect that feature sooner or later (and then 'electronic skins'). Better of course would be a universal transmission standard. I mean how hard could it be to send a single switch pulse out?! You have to give kudos to XpanD in not only have a good product already, but to have seen the market hole and jumping in immediately. ++ I have worn their glasses and find them quite comfortable, with a big field of view.... mstockfisch • Mar 19, 10:30am CEA's R4 WG16 "3D Technologies" workgroup is in the process of standardizing the emitter-to-eyewear IR subsystem. The goal is to standardize parameters & signal protocol, with careful consideration given to interference from the environment and to other consumer products.... hharris4earthlink • Mar 21, 1:19pm This seems to be an electronic standardization of the link between the TV's emitter and the eyeglasses. Is there a psychological/perception standard that maximizes the viewer experience and minimizes eye strain, and if so, are TV manufactures following it? Having an electronic standard is all well and good, but I would think there must be a higher perceptual standard that the link standard must address.... alfredpoor • Mar 21, 2:57pm Perception is a slippery conception. It varies with individuals, and in macro/micro scales. There are no standards that I know of that set standards for stereoscopic imaging. It's not like light intensity -- such as lasers -- where you can set limits to prevent permanent vision damage. It is generally accepted that 30 frames per second (fps) is sufficient for people to see smooth motion. (Movies are filmed at 24 fps.) 60 fps is typically required to eliminate any flicker. As a result, stereoscopic TV is run at 120 fps so that each eye gets 60 fps images. The difference between the different sets is how the sync signal is encoded so that the glasses present the correct image for each eye with minimum crosstalk. But as for there being a "higher perceptual standard, I'm not aware of one. Alfred... hharris4earthlink • Mar 21, 9:13pm Thanks. I have a feeling there's something missing here, probably my lack of knowledge of how this works. When we talk about normal film, we are talking about an image being replaced a certain number of times each time interval. In 3D glasses are the left and right picture replaced simultaneously? This would mean, obviously, that a 3D camera records left and right view simultaneously. But I had the impression that left and right are recorded one after the other and that 3D glasses continuously switch between left and right, using persistence of vision to allow the brain to integrate it into 3D.... alfredpoor • Mar 25, 8:03am It's not exactly persistance that merges the left and right images; it's more like the fact that the images come quickly enough for the brain to perceive them as a single image; this is much like the red, green, and blue images of a DLP projector being merged in the brain to create a full color image. The left and right images are presented sequentially, so each eye receives an image in turn. However, the frequency of the images to each eye is the same or faster than film or video. The home 3D systems use 120 Hz refresh rates, which means that each eye will see 60 distinct frames per second. So, yes, the image "jumps" back and forth between the left and right eyes, but it happens so fast that it is perceived as smooth motion, just as with standard 2D video images. Does that help? Alfred... hharris4earthlink • Mar 25, 1:05pm Fascinating. So I assume the function of the glasses is to shutter out the left eye when the right image is being shown and vice versa. Is there an industry standard now so different manufacturers glasses will work with any 3D TV? Can 3D glasses be made light enough so they can be comfortably worn for hours at a time? Looking into the future, for those of us who wear glasses anyway, would it be possible to wear prescription glasses that become 3D glasses when they receive a 3D signal? (Double as sun glasses?) Further into the future, how about contact lenses? Sounds like a growth market in innovation. Thanks!... alfredpoor • Mar 25, 1:12pm Yes, the glasses close off the light to one eye then the other. They are typically called shutter glasses or active glasses. One of the major manufacturers of these glasses has a model that they claim works with all the major 3DTV models. (I have not tested this claim, but I have no reason to think it's not accurate.) Yes, the glasses can be lightweight. I envision one possible future where most people will wear them all the time, whether or not they need corrective lenses. These glasses could serve as your Bluetooth headset, MP3 player, sunglasses, and more (as well as provide vision correction if needed), and use a combination of photovoltaics and energy scavenging/harvesting so that they would never need to be recharged. Alfred... hharris4earthlink • Mar 25, 4:19pm Might even be a fashion statement and would save me running around like a dork with headphones and an iPod clipped to my belt. Very cool. I want one.... hdtvhodges • Mar 25, 6:20pm
...I envision one possible future where most people will wear them all the time,... Alfred I guess I'll continue my life of being the unfashionable one in this case. I do everything I can to avoid wearing glasses of any type, and only wear sunglasses out of necessity.... More from Alfred Poor
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About Alfred PoorAlfred Poor is a well-known display industry expert, who writes the daily HDTV Almanac. He wrote for PC Magazine for more than 20 years, and now is focusing on the home entertainment and home networking markets. |
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