How Virtual Pixel Works on Electronic Billboards

Why do EuroDisplay’s LED screens use the HDVpixel© with QuadCore© technology on its LED screens? And what is it exactly?

These are very common questions when you approach the LED screens industry for the first time. The answer might look obscure at first, but it is actually very simple once you understand a few basic principles.

The HDVpixel© is a video-management feature that allows a 400% increase in image quality. Yes, 400%. So why we use it is pretty obvious: we use it to show better quality, realistic-looking images.

Why Do You Need the HDVpixel© with QuadCore© Technology on Your LED Screen

But why do we need to increase the image quality of the LED screens through a video-management feature in first place?

It's pretty simple: despite of its huge size, a LED screen has usually many less pixels than the PC screen that you used to download this file.

On a normal PC screen, you can have – for example -1024 x 768 physical pixels or more, while on a digital billboard you have many less pixels available.

How is that possible? Because on a LED screen, the distance between 2 pixels can be up to 30mm or even more.

This means that on a 4x3 meters LED giant screen you could have 192 x 144 physical pixels against 1024x768 of the PC monitor. This is a big difference.

So how can we actually see anything on a LED screen with a resolution of 192 x 144 (27.648 physical pixels in total)?

Why should you use it?

Thanks to the HDVpixel©, we can double the number of pixels in length and the number of pixels in height.

Therefore we can increase the number of pixels perceived by the human eye, by 4 times.

This means that the same screen we mentioned before (192 x 144) with V HDVpixel© technology will have a perceived resolution of 384 x 288 pixels (or 110.592 pixels).

So the reason why you should use the HDVpixel© is because it increases the image quality on your electronic billboard.

And the better the image, the easier is to sell advertising spaces.

How HDVpixel© Works

This technology is based on a pretty simple geometrical concepts: if you have two identical shapes placed next to each other, by taking half of each shape, you can create another identical shape.

In case the concept is not clear, the pictures below might help you.

Here we zoomed closer to the surface of a LED billboard and now you can see 3 pixels, with 4 LEDs each (2 Reds, 1 Green and 1 Blue). Do you see them?

Now, as we said, if you have two identical shapes placed next to each other, by taking half of each shape, you can create 1 more shape.

For example, if you have 2 identical pixels lying next to each other, by taking half of each pixel, you can create 1 more pixel... identical to the first two.

Let's see it more clearly in the next image: here you can see 3 real pixels and 1 virtual pixel (highlighted in yellow), also formed by 4 LEDs (2 Red + 1 Green + 1 Blue).

So, what happen when you combine the first 3 real pixels, with the pixels that you created “virtually”?

You just doubled the number of pixels (from 3 to 6), as you can see below.

Now imagine to double the number of pixels you have in length, and - with the same technique - double the number of pixels you have in height.

In the example in these images, you will go from 9 pixels (3x3) up to 36 pixels (6x6).

This is an increase of 400% on the number of pixels available and therefore on the image quality.

What Is the Technology Behind It?

To begin with, we can say that Euro Display’s HDVpixel© with QuadCore© technology is very similar to the MP3 technology used in the music industry.

MP3 is an audio-specific compression format based on the acoustic perception of the human ear.

It provides a representation of pulse-code modulation-encoded audio in much less space than straightforward methods, by using psychoacustic models to discard components less audible to human hearing, and recording the remaining information in an efficient manner (similar principles are used by JPEG, the image compression format).

In the same way, the Euro Display’s HDVpixel© with QuadCore© technology is a compression based on the visual perception of the human eye.

By compressing a big image to fit the small resolution available on the screen, the QuadCore© technology algorithm compress the images the way MP3 compress sounds.

This compression (together with the image persistence on the retina) allows us to control the visual perception by showing details, in our case one pixel, where there is none: that's why it is called “virtual”.

©2004-2018 Fabio Aversa. All rights reserved. No part of this article may be used or reproduced in any manner whatsoever without written permission from the author.

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