It might just be unmanageable to believe, but the primary experiments in three dimensional television date back to the early 1970’s when a research group based in the united kingdom started to consider the potential of using certain exotic materials to manufacture a 3-d tv effect. Now, four decades later, consumer 3-d televisions are all the rage at the 2010 consumer electronics show at las vegas.

History of 3-d

How does 3-d work?

There are a small amount of ways of developing a 3-d effigy, but they all intent to accomplish the same thing; to manufacture more or less offset images in each eye so that the brain combines them into a single 3-d effigy in the same way that it achieved depth sensing in the real world.

One way is to use glasses with one red lens and one cyan lens. These are employed to view images that are made with offset coloured layers. Each lens filters out one of the layers, so each eye sees a dissimilar layer and the brain combines them into a single 3-d effigy.

Another way of accomplishing a alike effect is the use of polarising glasses. One lens polarises in one direction and the other in the opposite one. The effigy to be viewed consists of offset images projected with opposite polarisations, so the vertically polarised lens allows that eye to see the vertically polarised effigy, and the horizontally polarised lens allows the other eye to view the horizontally polarised effigy.

A third way is to use alternate frame sequencing. Left eye and right eye images are projected simultaneously and the viewer wears exceptional lcd glasses which open and close each lens in sequence with the projected effigy. The glasses may be controlled using radio signals, and are an ideal nominee for bluetooth technology. In point of fact bluetooth 3d glasses were unveiled at the ces show.

Of course, wearing specialised glasses has its drawbacks, and the most sought after 3-d technologies are those that do not rely on such devices. Various such technologies have been created and together they are denoted to as auto-stereoscopy.

The most mutual of these uses lenticular lenses, which are lenses that vary in magnification depending on the angle from which they are viewed, and parallax barriers which concede each eye to see a dissimilar effigy. Alternatively eye tracking may be employed to ascertain that the appropriate images are displayed to each eye.

3-d tv models

The primary high definition 3-d tvs were created for business, and were far too expensive to be looked at appropriate for domestic use. They were fabricated by philips and employed wowvx technology. This technology is auto-stereoscopic and doesn’t necessitate wearing glasses. It uses a variation of the lenticular lens technology described above. Philips has now withdrawn from future developments of the technology until a glasses-free 3-d tv format is agreed amongst the major makers.

Now all the major tv makers have demonstration 3-d tv’s and they were unveiled at the consumer electronics show in las vegas in january 2010. Amongst the manufactures showcasing their new 3-d models were samsung, sony, panasonic and lg. Regrettably all of these use alternate frame sequencing technologies as described above and glasses should be worn to experience the 3-d effect.

It is expected that these are going to be available commercially in the us early in 2010 and in europe a small later. It is envisioned that almost four million are going to be sold in the primary year.

Of course there is no point in having a 3-d tv if there are no 3-d broadcasts. So far significant progress has been made in this direction: the invention channel is teeming up with sony and imax to provide 3-d broadcasts; bskyb in the uk are going to be launching a 3-d service in late 2010; espn have announced that they have in mind to broadcast almost 100 sports events in 3-d; and other plans to broadcast 3-d are in the pipeline.

The future: auto-stereoscopic tv in the home?

The major drawback with current 3-d tv models is the demand to wear exceptional glasses, so will it ever be possible to do without them? In point of fact the answer to this is probably. As was mentioned above, the technology has already been demonstrated, but the problem is that the price is plainly prohibitive and, until a popular may be agreed amongst makers and broadcasters, presently outside academia any farther developments are on hold.

We think there is a danger that the current 3-d tvs which require that spectators wear exceptional glasses will end up as a short-term gimmick and, once the novelty has worn off, it could be a mercantile failure. This could either hasten the development of 3-d tv without glasses or is could delay it. Only time will tell.

Get hold of a simple broom-handle. Alternately you can make use of a dowel rod or ready-made plastic tubing that’s available from a plumber or a builder’s merchants

The thickness of the rod is not paramount and anything from about half an inch or better will function perfectly well
Create a relatively large base to hold the rod vertically. The base should be heavy enough to keep the rod vertical at all times

Get hold of an aluminium disk with a minimum 6 inch diameter. A disk of approximately 12 inches seems to be the optimum size. The disk will provide a capacity hat termination and will help in reducing any noise pick up

Source a quantity of no.16 PVC plastic covered standard wire. If this is not possible then a good alternative is no.16 or no.18 enamel covered copper wire. If this is not available then standard no.18 speaker wire will do With one end of the wire connected to the disk, begin winding a consistent coil around the rod. The coils should sit next to each other and be bound tightly to the rod. On completion of binding the rod you should then terminate the wire either by connecting it directly to your antenna tuner or by a proprietary wire connection terminator. Ensure that the wire extending from the base of the rod is as short as possible On completion you can protect your antenna by coating it in proprietary insulation tape or by giving it several coats of protective spray

For optimum performance ensure the antenna is placed close to a window, in a garden or veranda. Ensure that the connection from the base is as short as possible

You can use your antenna without a dedicated tuner, however there will be a lack of enhanced core quality if the antenna is not attached to a receiver via a bespoke dedicated tuner

Your new antenna is now geared up for use

This simple wire-wound antenna will provide a great basis on which to trial your experience. Providing a ground link to both the antenna and tuner will optimise the system. A simple technique of creating an artificial ground is to connect a minimum 5M strand of wire which you allow to fall on the floor of the room or garden.

from youtube

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