Nowadays there are more and more different types of screens . Commercial argument or real technological advantage The names are not always very representative of the qualities of a screen.
At Win Light, we are experts in digital signage . This is why we make it our duty to know the advantages and disadvantages of these screens in order to offer the solution best suited to the needs of our customers. In communication, there are generally two categories of screens: LED and LCD. However, these are not the only ones. In order to help you better understand the advantages of these solutions, we will present the technical characteristics of these digital screens to you.
- LCD screens or monitors
- Plasma screen
- LED screen
- OLED and QLED screens
LCD SCREENS OR MONITORS
The LCD screen (Liquid Crystal Diplays) is the most common screen in our daily life . It is found on our computer screens, some televisions, our tablets and smartphones, on our digital cameras, etc. As the name suggests, it works using liquid crystals that are used as polarizing filters for light. It is therefore a passive display system.
This means that it works by backlight and therefore does not produce direct light.. This is why it generally has limited brightness. This makes this type of screen difficult to see in direct sunlight. Although the latest technological advances have improved this factor. LCD generally uses two types of backlight technology: neon or LED. Hence the mention of LED television or LED monitor not to be confused with LED screen which is a different technique.
Advantages and disadvantages
The major advantage of LCD solutions is that they allow high quality near visibility . They are also light and easy to handle screens. This is why it is the format most used by the general public. In addition, as it is the most widespread type of product, the market is well developed. This makes it possible to find solutions for all budgets. It is, moreover, the most economically accessible solution .
On the other hand , LCD screens have a certain number of drawbacks. Particularly in terms of fragility with a fairly short lifespan on average 4/5 years for professional use. They are also limited in size (max 2.8m diagonal) and shape. Finally, despite the progress made by the integration of LEDs in backlighting, the LCD also tends to lack contrast, especially in black tones and to be sensitive to the afterglow effect ( burn in) of the image.
The Plasma Screen
The plasma screen is less common for professionals than for individuals. Indeed, this type of screen works by the illumination of noble gases via an electric current. It is this flow of energy that transforms these gases into plasma (hence its name) and produces ultraviolet light. This is then converted into colored light. We find this solution mainly as a television or for professional use .
Advantages and disadvantages
It has the advantage of being less limited in size (up to 3m80 diagonal) . Above all , it offers better contrasts, among the most qualitative . It also allows close visibility with superb image quality , fluid and which has a fairly wide viewing angle (+ 160 °) .
On the other hand, they are heavier screens because of the glass panel, with an effect of reflection of the surrounding light sources. They are also sensitive to the phenomenon of image persistence when turned off, known as burn-in (caused by still images). They can also present an effect of tingling of the image. As they work with a variable electric current, this can cause more energy consumption depending on the intensity. Finally, it is a type of screen that is more difficult to produce and therefore relatively expensive.
Reminder: We are talking about LED screens as such, and not so-called “LED” TVs which are in reality LCD screens with an LED backlighting system.
This type of digital screen works thanks to LEDs which will play the role of pixel or sub-pixel. These thus emit their own colored light directly . They are then controlled in order to vary their intensity. The use of LED technology in screens is also constantly evolving in order to make them more and more efficient and versatile.
Advantages and disadvantages
Unlike other LCD screens, LED screens have the advantage of emitting their own lights. They are therefore visible in full sun with a high quality of contrasts and saturation. In addition, they are more resistant screens, some can last a good ten years. In particular, thanks to the use of LEDs, it consumes less energy. Finally, since they are not dependent on optical filters, they are not limited in size and shape. They can therefore take original shapes and represent several square meters.
However, the LED screen also has drawbacks. This is because the size of the LEDs and the spacing between them can make these screens less suitable for near vision. In general, the majority of LED screens start for a visibility of 4 m distance. However, this is less and less true with the
use of mini-LEDs and micro-LEDs. Thus, there are solutions to see the sharp image a 1.5m – 2m. They are therefore privileged display screens for far vision from a few meters to several dozen.
OLED AND QLED SCREENS
This type of screen works similar to an LED solution. Each diode represents a sub-pixel, but with different basic technology, since it is the OLED for Organic Light-Emitting Diode or organic light-emitting diode. The light-emitting property of OLED therefore does not require the use of a backlight . However, it has a lower light intensity than LED and a shorter lifespan .
The digital OLED displays have the advantage of offering excellent image quality , and with a very wide angle of vision. In addition, they have the particularity of being able to be very thin, even flexible . However, these screens are complicated to produce, expensive and therefore better suited to small formats (smartphone, tablet) . Finally, like plasma, they are also sensitive to the effect of burn-in .
QLED screens are not an evolution of OLED screens, but a full-fledged solution. In addition, these are closer to LCD screens . Indeed, they work by backlighting. The Q comes from Quantum-Dot which is a filter applied to an LCD screen to boost its brightness and colorimetry . The name QLED is therefore more commercial than a direct reference to its operation. However, although expensive, this solution has the advantage of being more accessible than OLED.
Screen, What IsThe Best Solution?
Nowadays we therefore have many types of screens available. The distinctions between its technologies are therefore made either by their size and visibility distance, or by their visual quality. There is no better technology than others, it depends on how it is used . In communication, the choice will be either LCD or LED depending on the size and the planned visibility distance. On the other hand on a daily basis for televisions or computer screens, the image quality and the budget will be more determining.