3D Glasses/ Virtual Reality Glass
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Most of us, at one time or another, have been fascinated by some form of 3D Glasses/ Virtual Reality Glass technology. Whether it be the red-and-blue comics in the back of a magazine or a stunning IMAX 3D film, there is something inherently captivating about seeing flat images come to life in vibrant three-dimensionality.
But how do those red-and-blue plastic glasses actually work? What about those vivid, full-color movies you’ve seen at Disney world or in an IMAX theater? Here you will know all about 3D glasses there function working procedure history.
What Are 3D Glasses?
If you’ve been to the movies lately, you may have experienced the wonder of seeing the experience in 3D glasses thanks to special glasses. If you’re from an older generation, you may remember how to clear red and blue plastic film helped images pop off a page or screen. But how do these 3D glasses actually work?
How Do We Naturally See in Three Dimensions?
Your eyes naturally see the world around you from two slightly different angles. This gives you depth perception and enables you to judge how far away something is. This is also why, when you close one eye, then the other, what you’re looking at seems to shift slightly. 3D glasses help your eyes process 3D images on a screen and create the illusion of depth.
How Do The 3D Glasses Work?
How 3D glasses work depends solely on how the eyes work and communicate with your brain. Human eyes have binocular vision that works best when you use both eyes simultaneously. Binocular vision gives you depth perception and allows you to tell which objects in your line of sight are closer or farther away.
Binocular vision relies on the distance between your eyes to present you with two different perspectives on the same thing. The distance between your eyes is generally about two inches apart, so the images each eye presents help to build a complete picture.
How Do 3D Glasses Work With Binocular Vision?
All types of 3D glasses work by making each eye see two different things. Whether it’s one eye seeing a red image and the other eye seeing a blue one or lenses that alternate darkening and lightening, your eyes seeing different things trick your brain into interpreting them in spectacular 3D.
Different Types of 3D Glasses:
There are generally three types of 3D glasses including anaglyph, polarized, and shutter. Each uses different methods to bring flat images on your screen to life.
How Do Anaglyph 3D Glasses Work?
These are the most common types of 3D glasses and the iconic image many think about when they wonder how 3D glasses work. These glasses utilize special red/cyan lenses to interpret the image. These lenses produce the images you see by color filtering the layered image that you’re actually looking at. While one lens filters out all the red in an image, the other lens filters out the cyan, causing your brain to see the picture in 3D. The image you’re looking at is usually the same image projected from two different angles or two entirely different superimposed images.
Anaglyph glasses come in several variations on the red/blue lens including:
- Magenta / Green
- Red / Green
- Red / Cyan
How Do Polarized 3D Glasses Work?
How 3D glasses work when it comes to polarized lenses depends on deceiving your eyes just like anaglyph glasses do. How do polarized 3D glasses work, you ask? They restrict the light that enters your eyes, but instead of restricting the light by red and blue colors, they have a yellowish-brown tint.
The image on the screen also has a role to play. In addition to the polarization on the glasses, the projected image is actually two images that are superimposed on the same screen through an orthogonal polarizing filter. Then the glasses, which have the same type of filter, allow each eye to see the two individual images on the screen.
These glasses are actually the optimal choice for IMAX 3D movies and they’re the grey lens glasses you normally get at the theater today.
How Do Shutter 3D Glasses Work?
Shutter glasses are considered the most advanced type of 3D glasses available today. While the other two types of 3D glasses use something called passive 3D, shutter glasses utilize active 3D. They don’t use filtered images or colors to create a three-dimensional effect. Instead, shutter glasses work through LCD screen technology that darkens each lens, alternating the left and the right. The lens darkening happens so quickly that you don’t notice the effect unless you’re paying close attention.
Shutter glasses are usually battery-powered, or even USB-supported, and are more expensive than traditional 3D glasses. The cost of these glasses makes a huge difference to the image quality. You can get shutter glasses from Samsung, Panasonic, Sony, and more.
Passive 3D Glasses vs Active 3D Glasses:
1. Passive glasses:
Strictly, any 3D glasses that do not require power are termed ‘passive’. In practice, Polarized 3D Glasses are the only passive glasses that provide the quality demanded by the modern consumer or movie viewer. While anaglyph glasses with different color lenses are still often associated with 3D movies, the color shifts or losses inherent in the approach make them a rare sight today.
There are two sorts of Polarized 3D glasses – circular polarized and linear polarized. Circular polarized glasses have one great advantage over linear polarized glasses, in not requiring the viewer to keep their head upright to maintain the 3D effect. So circular polarized glasses are a more comfortable experience for wearing during a long movie or TV program.
In the cinema, polarized glasses require a special silver screen that preserves the polarization, although Dolby has developed a technology that allows passive glasses to work with a standard screen. The system uses slightly different RGB spectral components in the L and R signals, and the glasses select the right components for the correct eye.
2. Active glasses:
Active (Shutter) 3D glasses are the most common type used in the home. Based on LCD lenses, which can be controlled to stay clear or become dark (open and close) alternately, a power supply operates the optics, while a synchronizing mechanism ensures the viewer sees the right images at the right time.
While earlier glasses needed to be connected to the TV by a wire, an infrared beam similar to that used by remote controls now sends the signal. Batteries contained in the glasses supply the required power.
Tips To Use VR Headsets
Light Castle Cardboard Style Virtual Reality VR Glasses For 3.5 – 6.0 Inch Smartphone
Buyers Guide For 3D Glasses:
Active 3D TVs offer full vertical resolution while passive 3D TVs offer half the vertical resolution because the image is split between the right and left eye.
The two different technologies make different uses of the resolution. Active 3D, because it alternates between two complete pictures for each eye, doesn’t affect the resolution of the content. Passive 3D, as we mentioned before, splits the vertical resolution between two frames, effectively halving it down. So choose it wisely.
When you put on the 3D glasses, the first thing you notice is that the brightness of the screen has been reduced about half. With both technologies (active and passive 3D), only half the light gets to the eye. With an active 3D TV, the lenses of the 3D glasses are black half of the time. With a passive 3D TV and glasses, one line out of two is black. To compensate for this issue, most TVs will automatically increase the brightness setting when displaying 3D content.
This means that both active and passive deliver the same amount of light to your eyes. Making them equally dim.
The biggest difference when it comes to moving between active and passive 3D technologies used for TVs is that active 3D shows left / right frames in sequence, while the passive 3D system shows frames simultaneously. This causes an issue when there is movement on the screen.
When it comes to perceiving movement in 3D, the passive 3D glasses take the cake.
Flickering, depending on the frequency, is a common cause of discomfort with television sets. For most people, it takes as little as 30 minutes to start getting a headache from watching a flickering screen. While this can be a serious issue regardless of the TV’s support of 3D technology, models that use active 3D shutter glasses will inevitably cause this.
Because 3D glasses block every other frame, a flickering effect will always be apparent, even with models that are normally flicker-free. It is a bit worse on some TVs, but it’s impossible to avoid unless you opt for a TV that supports passive 3D technology.
Passive glasses also do not require batteries in order to work. This isn’t the biggest issue, but it generally means they are more comfortable to wear than the heavier active shutter variant.
From this, we can conclude that passive 3D glasses take the win when it comes to comfort.
In this article, you will get to know all about 3D glasses there working mechanism, and all types. It will surely help you to buy the best 3D glasses for you so give a read to know details about the virtual reality glasses.