Difference between active 3D glasses and passive ones.

3D-technologies, having passed from the category of special effects to those already quite accessible and almost traditional, presented the consumer with a difficult task of choice. Today, manufacturers offer three ways to get into three-dimensional video space: through the so-called passive or active 3D glasses and autostereoscopic monitors. The latter are currently too expensive to manufacture and are not used for home theaters. This means that when choosing a 3D TV, a potential user chooses for himself an active or passive technology. And while this means choosing between devices, in the end the glasses you will have to wear play a decisive role. It is only worth remembering that replacing one view with another will not work without replacing the signal source itself - a TV or monitor.

Definition

Active 3D glasses - auxiliary devices used for the formation of a volumetric image by the human visual apparatus, requiring connection to a power source. Their principle of operation is to use a shutter mechanism that alternately covers the left and right LCD screens, which are used in active glasses instead of glasses. The shutter mechanism is synchronized with the TV, which shows frames in turn for each eye at a high frequency.

Active 3D glasses Samsung SSG-3700CR

Modern passive 3D glasses - devices used to form a human visual apparatus of a volumetric images that do not require additional power supplies and installation of complex mechanisms. The principle of operation of such glasses is based on the use of polarizing filters, which provide a separate picture for each eye. Both linear and circular polarization are currently used. To get a 3D effect with passive technology, the screen must also be equipped with appropriate filters.

Passive 3D glasses

Comparison

and image quality. Of course, they divide any group into two diametrically opposed ones: the cost of the device is usually inversely proportional to the quality. 3D glasses are no exception.

The cost of active points can exceed the cost of passive points at times, and sometimes dozens of times. Today we are not talking about anaglyph (the same ones from the 90s, with multi-colored glasses and cardboard frames), although they are also passive. However, a TV or monitor with a polarizing filter (giving the effect of a silver screen) is much more expensive than a 3D device that comes with active glasses. On the other hand, the active technology does not provide universal compatibility of glasses with devices, and synchronization is sometimes available only if the models of the same manufacturer match.

One of the advantages of active glasses over passive ones can be considered the resolution of the supplied picture. Since LCD lenses show the entire frame, and polarized lenses are interlaced, the resolution of the former appears to be much higher, the image is more detailed and clearer. Despite the assurances of the manufacturers of passive glasses to combine the picture directly with vision, clarity and detail suffer greatly. Brightness suffers in both cases: both shutters and polarizing filters degrade color reproduction. Subjective evidence nevertheless speaks of more or less natural brightness of the image obtained using passive technology. On the other hand, if we switch to 2D, a high flicker frequency and the absence of a polarizing filter in TVs with active technology will give a picture of a higher quality.

As technically sophisticated devices, active 3D glasses weigh much more than passive glasses. In this case, the advantages of the latter are literally on the nose: the less pressure on him, the better the viewer feels. However, comfort is still limited: passive glasses with linear polarization do not allow changing the angle of inclination of the head (the effect of three-dimensionality disappears), glasses with circular polarization have not very wide viewing angles, so you can not hope to watch a movie lying down without changing the tilt of the screen. A high degree of eye fatigue due to flickering, which has become a side effect of active technology, can also be attributed to the comfort problem.

Active glasses require periodic recharging or replacement of batteries. Passive ones do not require any additional accessories at all, which, coupled with their cheapness (even disposable ones can be used in cinemas - not a single IMax has yet gone bankrupt) works in favor of the tangible superiority of such technology. In addition, the system of synchronization with a TV or monitor (infrared port or bluetooth) requires no interference, which is sometimes difficult to avoid at home: for example, watching any movie without a remote control may not be a joy. There is interference - there is an out-of-sync, which means that the picture from 3D becomes two-dimensional and double.

Conclusions TheDifference.ru

  1. Active 3D glasses alternately show frames for each eye, passive - simultaneously.
  2. Active 3D glasses are many times more expensive than passive ones.
  3. The Active 3D Glasses require a power source.
  4. Passive 3D glasses are comfortable to use.
  5. Sharpness and detail of the image in the active 3D glasses is higher.
  6. Passive 3D glasses have higher picture brightness and optimal color rendition.
  7. Passive 3D glasses require special expensive screens.
  8. Active 3D glasses require a sync device in the device.
  9. Passive 3D glasses have lower viewing angles.
  10. Many people complain of eye strain after using active 3D glasses.
.