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GIANT SCREEN AND NOTION OF BRIGHTNESS

Brightness is an essential factor in ensuring good visibility of a screen depending on its environment. Indeed, SMD screens that are too bright indoors will be too dazzling. Conversely, a screen that is not intense enough outdoors or in a bright environment will not be visible.

In addition, the brightness links to the type of screen select. In addition, among these types of screens, there are different levels of intensity to meet each need. So how do you know if a screen has the right brightness for its environment?


HOW IS THE BRIGHTNESS RATE


There are many units of measurement use to describe the notion of luminosity and to characterize light. Indeed, we speak of luminance, luminous intensity, lumens, or even lux. So many data may seem to mean the same thing and yet are different. If all of them are not indicated in the technical characteristics, they are generally linked.

Luminous intensity is expressed in candela (cd) and refers to the amount of light emitted in a given direction.
The luminous flux expressed in lumens (lm) represents the total quantity of light emitted by a light source, in all directions. It makes it possible to determine the raw luminosity of a “bare” light source but remains different from that perceived by our eye.


Luminance is expresses in nits or candela per square meter (cd/m²). It makes it possible to account for the quantity of light emitted by a total surface.
Conversely, illuminance, expressed in lux, accounts for the quantity of light received on a surface.

Now that the technical elements are defined, how to use them. As part of a screen, its main purpose is to be visible and not to serve as a source of lighting. It must therefore be seen clearly in a given direction. That is to say, it must emit enough light information in the direction of the eye looking at it.

This is why we focus more on the notion of luminous intensity. In addition, the operation of a giant screen is based on an emission surface. We will therefore mainly focus on the luminance generally expressed in nits and sometimes in cd/m² to evaluate the brightness and good visibility of the screen according to its context.

HOW BRIGHT ARE THE SCREENS


There is a wide variety of screens on the market. There are different technical solutions, but also between articles for the general public and articles dedicated to professional communication. The screens that we face the most are the televisions and PC screens that we generally use daily. These consumer products generally have a brightness between 250 and 500 cd / m², which is sufficient to enjoy videos inside our homes. Plasma or SMD Screens can go up to 1000 cd/m².

For professional use, installations will have different constraints. This is particularly the case for screen installation in windows, outdoors, or on display. It is therefore necessary to be able to propose solutions adapted to these. For this, there are high brightness monitors ranging from 750 nits up to 5000 nits. Finally, LED screens are emissive solutions.

They thus offer a higher luminosity which can go up to 8500 cd/m² according to the ranges. Finally, it is important to specify that this luminosity is not fix, it is generally a maximum value, and it can thus be modulated according to the circumstances.

BRIGHTNESS OF THE SCREEN DEPENDENT ON THAT OF ITS ENVIRONMENT

The brightness of a screen is important because its primary purpose of it is to be visible. But for this, the light intensity it emits must be greater than that received from its environment. This is why televisions or laptops are not visible when exposed to strong light.

This is the reflection effect observed when the sun’s rays pass through the window and hit the television. Likewise, when you want to work on your laptop outside and you cannot see what is displayed on the screen. Indeed, our eyes will perceive more light information by the reflected rays than by those emitted by the screen.

In addition, regarding SMD Screens, not all of them are suitable for use subject to high exposure. Indeed, not all slabs are suitable for UV resistance. They can thus darken following long exposure to the sun.

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