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HomeArticle → TV Â: which screen technology should I choose? What resolution?
TV Â: which screen technology should I choose? What resolution?

TV Â: which screen technology should I choose? What resolution?

The display slab technology is essential, as it has a direct impact on the image rendering and the price that will pay when purchasing your TV.The LCD is almost 50 years old and this technology is perfectly controlled today.The rendering can be very different depending on the backlight mode used.QLED is improved LCD using a quantum box filter.The OLED holds the top of the pavement on the high -end and medium -level market thanks to its inherent properties.Next comes the new LED micro LED that promises to be the technology of the future.

LCD, LED, Qled a family in three shares of importance

LCD screens are today perfectly mastered, which seems normal, being the oldest.They have experienced many improvements that have given birth to derivatives that each time bring a significant qualitative gain.

LCD, it all depends on the LEDs

LCD (Liquid Crystal Display) technology is now almost 50 years old. The operating principle is quite simple. An LCD slab consists of a layer of liquid crystals surrounded by electrodes and two polarizing filters. The first polarizes horizontal light and the second the vertical. The voltage applied by the electrodes will therefore modify the level of brightness, which comes from the backlight placed behind. If no tension is applied, the polarizing filter blocks the light. In the case of a color screen, each pixel consists of three subpixels, one per primary color. Just play on the intensity of the light on each of the three sub-pixels to obtain the desired color. There are two variants of the LCD, the IPS which provides better viewing angles, but less deep blacks and higher response times. The LCD tiles will bring black blacks than the IPS, but the viewing angles are a little less important.

However, for a television it is the retro lighting that will make the difference. Thus, historically an LCD screen is backlit by parallel tubes placed in the horizontal. However, televisions abandoned this technology for Direct-LED and EDGE LED. The first is to line the back of the LED slab, which offer homogeneous light on the whole screen. The Edge LED is to place LEDs around the slab. This makes it possible to get finer screens, but the brightness is less homogeneous. This causes "clouding" effects (halo effect around the light elements surrounded by black like the subtitles for example) which can spoil the quality of the rendering and therefore the pleasure. Avoid this type of screen if possible and prefer direct-LED or even better the Dimming room. In this case, the LEDs are grouped into zones which are managed independently and dynamically. The result is much better management of black areas, contrasts. To go further, the mini-LED replaces the LEDs with mini-LED 4 to 5 times smaller. This allows even finer management of light and therefore blacks, while reducing the clouding effects.

Qled the LCD +++

TV : Quelle technologie d’écran choisir ? Quelle résolution ?

QLED is a technology derived from the LCD. It takes the same principles except that a quantum box filter (quantum dot in English) is inserted between the backlight system and the LCD slab. Everything is due to the optical properties of cadmium selenial nanocrystals. Thus, they see their shape and size change depending on the light flow they receive. This has the consequence of modifying their color. The result is that a QLED TV offers an image whose red and greens, the weak points of LCD televisions, are reinforced. We therefore obtain a more complete, beautiful colorimetry, while winning in the brightness peaks and the rendering of the blacks. However, in terms of contrasts and color fidelity, the OLED remains in front. On the other hand, for daytime use or with light light, QLED combines brightness and often an anti -reflective filter which then makes them much more comfortable than the OLED in the middle of the day.

OLED (almost) perfection

The OLED (Organic Light-Emitting Diode Diode or organic electruminescent diode) is a technology based on an organic electronic component.Everything is based on the presence of organic polymers capable of emitting their own light when they are crossed by an electric current.In practice, an organic film is surrounded by two others which serve as electrodes.No need for backlighting, which allows you to make much thinner screens than LCD or QLED.

Each screen pixel consists of three diodes (subpixels), red, green, blue, and sometimes a fourth white, which are fed independently.When a pixel is off, it is completely black which brings contrasts really superior to the LCD.They are said to be infinite in the case of the OLED.Indeed, thanks to the absence of backlight, there is no diffusion on other pixels and blacks, as colors are displayed with greater fidelity.

Micro-LED, the future?

A micro-LED is a LED of the thickness of a hair, 99 % smaller than a classic LED.It is made up, unlike the OLED, of inorganic components (gallium nitride).However, they have the same ability to generate light by being traversed by an electric current.Being inorganic, they are supposed to be much less sensitive to aging.Each pixel consists of three sub-pixels and therefore three micro LEDs that turn off are total black.

The result is in theory superior to the OLED with a resolution and a contrast of colors considerably higher and above all a brightness which can reach 4,000 nits as on the first products signed Samsung.Where the OLED displays between 600 and 1000 Nits in the best of cases.We should therefore keep the same level of image quality, regardless of the light environment and the size of the slab.Finally, micro-LOs announce a lifespan of 100,000 hours against 10,000 for the OLED.The technology of tomorrow and which is still far too expensive for ordinary people.

To help you in your choice, consult our guides: