Last Thoughts About LEDwalls' Virtual Pixel
There are still a few things I would like to say about LEDwalls and the Virtual Pixel (Geometrical Vs. Interpolated).
In the previous posts we learned that Geometrical is a relatively old technology and that it only works properly when LEDs are equally distant to eachother. The problem is that even in this case, there are some side effects.
The main side effects are related to the Minimum Viewing Distance, Chromatic Fidelity and Contrast Ratio. Why? you are probably asking. Good question. Lets see.
Minimum Viewing Distance
If LEDs are spread all over (and not grouped in units or pixels), what actually happen is that the pixel gets bigger. Right?
And if the pixel get bigger, the image must be looked at greater distance or it will appear pixelated (with dots). Right?
And if the image is pixelated, you must move away from the screen in order to perceive it as smooth and defined. Right?
What does that mean in terms of image quality? It means that the Minimun Viewing Distance increase. And you might want to consider that, expecially if you are installing the LEDwall indoor.
Chromatic Fidelity
The distance between the LEDs has another side effects: indeed, the closer the LEDs are to eachother, the better their single colors will mix, the sooner your eye will perceive the entire pixel color (the sum of the 3 basic colors: red + blue + green). Clear, no? Ok.
On the other side, the more distance you put between LEDs, the more distant you must be in order to perceive the right color mix. What does that mean? It means that not only the images at short distances might look pixelated, but they might also have a poorer chromatic fidelity (yellow might appear as a dot half red and half green)
Contrast Ratio
Last but not least, if you have LEDs spread on the LEDwall, the surface might not be as black as you would like it to be to ensure the best contrast ratio. Let me explain.
Each LED has a white background (or anyways clear) that is much lighter than the black surface of the screen. Now, if you spread this white LEDs on the black surface, what you get is a grey area.
Since the contrast level is a ratio between the light emitted by the LEDs and the environmental light reflected by the screen, you can very well understant that your surface should be as dark as possible.
Why Interpolated Pixel avoid all these problems?
Because it allows to put LEDs closer together, to form a clear unit (pixel). In this way you: 1) have a smaller minimum viewing distance because the pixel has a smaller surface; 2) get an higher chromatic fidelity because LEDs are closer and therefore colors mix faster; 3) you increase the contrast ratio because the more space there is between LEDs the more black the surface will look.
Each manufactuer will of course highlight the strong point of its technology, but bear in mind this information next time and make your own conclusion.
Ok, that's it. In the past few posts I tried to clarify a fairly complicated topic, that often create confusion among people approaching the LEDwall business.
Most of the time, the confusion is due to the fact that each manufacturer has its own approach and provide different solutions to the same problem, each one with its pros and cons.
I hope I provided you with useful information, that will help you to make a more conscious consideration when you have to decide which kind of LEDwall better suits your needs.
In the previous posts we learned that Geometrical is a relatively old technology and that it only works properly when LEDs are equally distant to eachother. The problem is that even in this case, there are some side effects.
The main side effects are related to the Minimum Viewing Distance, Chromatic Fidelity and Contrast Ratio. Why? you are probably asking. Good question. Lets see.
Minimum Viewing Distance
If LEDs are spread all over (and not grouped in units or pixels), what actually happen is that the pixel gets bigger. Right?
And if the pixel get bigger, the image must be looked at greater distance or it will appear pixelated (with dots). Right?
And if the image is pixelated, you must move away from the screen in order to perceive it as smooth and defined. Right?
What does that mean in terms of image quality? It means that the Minimun Viewing Distance increase. And you might want to consider that, expecially if you are installing the LEDwall indoor.
Chromatic Fidelity
The distance between the LEDs has another side effects: indeed, the closer the LEDs are to eachother, the better their single colors will mix, the sooner your eye will perceive the entire pixel color (the sum of the 3 basic colors: red + blue + green). Clear, no? Ok.
On the other side, the more distance you put between LEDs, the more distant you must be in order to perceive the right color mix. What does that mean? It means that not only the images at short distances might look pixelated, but they might also have a poorer chromatic fidelity (yellow might appear as a dot half red and half green)
Contrast Ratio
Last but not least, if you have LEDs spread on the LEDwall, the surface might not be as black as you would like it to be to ensure the best contrast ratio. Let me explain.
Each LED has a white background (or anyways clear) that is much lighter than the black surface of the screen. Now, if you spread this white LEDs on the black surface, what you get is a grey area.
Since the contrast level is a ratio between the light emitted by the LEDs and the environmental light reflected by the screen, you can very well understant that your surface should be as dark as possible.
Why Interpolated Pixel avoid all these problems?
Because it allows to put LEDs closer together, to form a clear unit (pixel). In this way you: 1) have a smaller minimum viewing distance because the pixel has a smaller surface; 2) get an higher chromatic fidelity because LEDs are closer and therefore colors mix faster; 3) you increase the contrast ratio because the more space there is between LEDs the more black the surface will look.
Each manufactuer will of course highlight the strong point of its technology, but bear in mind this information next time and make your own conclusion.
Ok, that's it. In the past few posts I tried to clarify a fairly complicated topic, that often create confusion among people approaching the LEDwall business.
Most of the time, the confusion is due to the fact that each manufacturer has its own approach and provide different solutions to the same problem, each one with its pros and cons.
I hope I provided you with useful information, that will help you to make a more conscious consideration when you have to decide which kind of LEDwall better suits your needs.
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