OLED displays, IPS, VA, TN ... What are the differencesv ?

Liquid crystal display technologies are numerous, but their rendering performance is not the same all. Quick overview.

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OLED, IPS, VA, TN ... Behind these barbaric acronyms hide the widespread display technologies and fundamentally different. They each have their lot of advantages and disadvantages, unfortunately too little known to the general public, even though the screen determines much of the ease of use of a device. It must be said that manufacturers rarely highlight the screen techno exploited in their products, except of course when it constitutes a strong marketing argument. This is the case of OLED displays, particularly effective (see below), but also more expensive. Quite the opposite screens TN, average performance (except for the game), but inexpensive for manufacturers.


TN, priority to speed, and price

The screens TN (Twisted Nematic) have the characteristic to vary the position of their liquid crystal very quickly, allowing them to display fast motion without blurring. Logical, therefore, that the vast majority of players use screens for a TN panel, the only technology able to go below 5 ms response time. Only problem: its viewing angles are poor and rendering very average image.

VA, contrast priority

VA panels (Vertical Alignment) are distinguished by their ability to very well "block" the light of their backlighting, and therefore display very dark blacks. An asset that seduces particular film lovers, looking beautiful colors and deep blacks (high contrast ratio). But these slabs are slow, and viewing angles are not yet perfect. Sharp, however, managed to produce slabs (UV²A) which correct these defects, so they can be used in screens for players. This is the case of the Eizo Foris FG2421 , unique. The UV²A technology would be the ideal compromise, but its production is limited.
IPS priority viewing angles

Image Professionals always have a soft spot for the IPS (In-Plane Switching), which offers very good colors and very wide viewing angles (which is why they are also used by manufacturers of smartphones). Only fault their contrast ratio remains hopelessly limited (about 1000: 1). They are also slower than TN panels, but the latest developments also possible to produce screens for players to 120 Hz (especially in Asus at CES 2015 ).

The philosopher's stone: OLED

Difficult to find the ideal solution LCD, unless expect democratization of a new technology: the OLED, which has nothing to do with liquid crystals. This new display technology uses organic polymers that emit their own light (no need for a backlight), and its performance is simply ... Perfect! For now, LG exploits for its latest TVs, and Samsung for its smartphones.
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