When Sony unveiled its HMZ-T1 3D viewer - a headset with built-in OLED 3D screens - at the Consumer Electronics Show in Las Vegas this January, tech insiders were not convinced by the white plastic prototype. 'It will never go on sale, was the general thought. 'Concept sneered others. Sony has proved the doubters wrong, though - not only is the headset real, its on sale for 800. The headset launches first in Londons Harrods, but it will roll out to Sony Stores across the country this year. The screen technology inside - OLED - is widely used in phones, but despite Sony championing the ultra-fast-moving TV technology, its still far too pricey for large sets at a normal price. Sonys demo versions of 3D sets have drawn awed stares at trade shows courtesy of their crisp blacks and fast screen updates, but they have never gone on widespread sale. The 'Head Mounted Display allows you to experience the effect of a large, high-contrast OLED screen by sitting two small OLED screens directly in front of your eyes. If you find that 3D films at the cinema give you a thumping headache, you might also find that the glasses offer the first 3D experience you can digest. The two panels are completely separate, so its the first home 3D TV set that is free of 'crosstalk - when the two 3D images interfere with one another. Crosstalk is responsible for many peoples negative experiences of 3D TV, including flickering and headaches caused by the screens. The 3D glasses will plug into any 3D source, such as games consoles and 3D Blu-Ray players. DM