General thoughts on IR emitters, active stereo LCD shutter glasses, and HDTVs.
I believe any 3D HDTV with a 3 pin Mini Din (VESA) jack is compatible with any emitter that uses the same type of plug. In other words, I'm pretty sure you don't need to use the emitter / glasses spec'ed by the HDTV manufacture.
The big issue is having glasses and emitter that are compatible with each other.
Based on the info previously posted in this topic, it appears there will be at least one model of glasses from Xpand that will auto scan for the IR frequency, which should be compatible with any IR emitter, from any company. It remains to be seen how well they work in finding and maintaining reception, but from a technical perspective, it should be quite doable. I would expect this product will be most popular used with HDTVs that have an integrated emitter.
It's an open question how many HDTVs with integrated emitters will also have the 3 pin Mini Din jack. I think that would be the best way to go, since it gives end users a choice in the glasses they can use, and it also is a backup in case the internal emitter stops working. Too bad the additional cost will probably make this a pipe dream.....
Otherwise, you'll most likely need to be sure your glasses and emitter are from the same company and are compatible with each other. Unless, some sort of common IR frequency is agreed upon and a standard is established. This seems unlikely at this time, but may occur in the future as 3D technology in the home becomes more widely accepted.
Some companies will probably try to have exclusivity for their brand of glasses and emitter communication, to insure best system performance, and higher revenue. Ways to accomplish this would be to use unusual IR frequencies, or something completely different than IR to control the glasses, see below.
As I've recently said about glasses, there are a lot of options, but like other hardware categories, some products simply work better than others. The least expensive option may, or may not, be the best option for any given type of display technology, and it will not surprise me in the least if some glasses work better than others for a specific type of display technology.
Having used StereoGraphics CrystalEyes products in professional applications for many years, with DLP, LCD, and CRT technology, I can vouch for their performance and reliability. It will be interesting to see if other companies can come up with less expensive alternatives that perform as good or better.
It will probably take some time for assessment of the various options available and a consensus to develop. Between now and then, you pays your money and you takes your chances. I'm sure some poor sap somewhere will have a shelf of glasses and emitters, different brands, models, sizes, etc., none of them being the ones he actually uses.
Additional methods of establishing control communications between emitters and glasses could include RF and Bluetooth among others, as the latest info from Vizio has them using Bluetooth, and DLP Link using a 'white flash' to control the glasses is another unique approach, but for the time being IR is the industry standard, based on years of experience with professional visualization and home use gaming products.