Practical uses for pointless technology

I've found a good use for the technology used in 3D TVs.

Firstly, a little explanation on how 3D works. If you know this, skip to the next paragraph. 3D works by fooling both your eyes into seeing a different image. In reality both your eyes see a slightly different view of the world and your brain interpolates these two images into a 3D representation. When you put on a pair of 3D glasses, you have a different filter over each eye, and the screen in front of you sends two images simultaneously - one that can't be seen through the filter in your left eye and one that can't be seen through the filter in your right. This ensures both eyes only see the image they're supposed to see. Older 3D glasses did this using colour (one lens only lets through red light while the other only lets through green) but more modern 3D systems use polarised light so you can actually see the 3D in colour.

OK, on to my groundbreaking relationship-saving idea. How many times have you wanted to watch something different to your other half? Usually this involves one of you being relocated to the smaller TV upstairs. But using the same technology that 3D uses, you can both watch something different and still be in the same room together! It's simple... one of you wears a pair of glasses made up of two 'left' filters, and the other wears a pair of glasses with two 'right' filters. The TV then sends out two different channels each at different polarisations and hey presto, one of you can watch Coronation Street while the other watches Doctor Who! Attach a couple of pairs of headphones for the two different audio streams and everyone is happy.

I'll be on Dragons' Den next week.