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Which Display Technology Is Twisted Nematic?

Views: 268     Author: Kaylee     Publish Time: 2023-09-21      Origin: Site


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Which Display Technology Is Twisted Nematic?

Nematic Liquid Crystal: What Is It?

We are all aware that water, which has the chemical formula H2O, is capable of existing in the solid (ice), liquid (water), and gaseous (vapor) phases of matter simultaneously. The molecular structure of water is represented by the chemical formula H2O.Isotropy is the state of having properties that are the same in all directions; this is because the molecules of H2O are always moving around in a random manner.The solid state is anisotropic and crystalline, and it exhibits direction-dependent optical properties in addition to other qualities such as thermal and electrical conductivity. These properties can be seen in the material. In addition, each and every molecule of H2O occupies a predetermined position within the solid.

The odd condition of nematic liquid crystal cannot be found in any of the three states that were previously discussed, hence it exists in a category all its own. This condition can be regarded of as a transitional phase between the isotropic (liquid) and crystalline (solid) phases of the substance in question. Even when in the state of liquid crystals, there are many other kinds of liquid crystal states; some of these states are explained in more detail below.

Developmental Phase of the Mind

The general organization of the molecules is maintained when they are in the nematic liquid crystal phase, and the molecules have a tendency to point in the same direction. The sequence that it follows only has one dimension.

A Stage in the Epicyclic Process

In the smectic phase, the order of the molecules can be observed in two dimensions, however in the nematic phase, this order is not present. In addition to generally preserving the nematic orientation, the molecules exhibit a propensity to align themselves in layers or planes. This tendency can be thought of as a secondary function of the nematic orientation. It is the state that exists between the solid state, which has a three-dimensional order, and the nematic state, which has only a one-dimensional order.

Cholesteryl Phase

Molecules in the cholesteric (also known as chiral nematic) liquid crystal phase are often arranged in a helical pattern and are directionally oriented, with each layer rotating at a slight angle to the layers above and below it. This type of liquid crystal phase is also known as chiral nematic.

In LCD display technology, only nematic liquid crystal is employed, and cholesteric liquid crystal is slightly doped to assist in the twisting of nematic liquid crystal molecules. Nematic liquid crystal is the only type of liquid crystal that is practically used. This is the origin of the acronym "Twisted Nematic," which is also the abbreviation for "Nematic Display" in its shortened form.

The Twisted Nematic (TN) Display: What Is It?

TN Display's Operation

Two polarizers, two glass substrates with transparent electrodes, ITO (Indium Tin Oxide), and a thin layer of liquid crystal material sandwiched between the electrodes make up the most basic type of TN LCD panel. 

Natural light from the light source passes through the top polarizer to become polarized linear light when the voltage is off. It twists with the liquid crystal twist layer when it comes into contact with nematic liquid crystal molecules. It travels through the bottom glass and reaches the bottom polarizer after rotating ninety degrees.The polarized light passes through the bottom polarizer since it is in parallel with it, allowing us to view the light (gray or white pixel).

The liquid crystal molecules will be perpendicular to the glass surface and lose their twist in the presence of an electric field when the voltage is on.The original transmissive quality of the polarized light is maintained without twisting when it collides with the nematic liquid crystal layer. Because the linear light and bottom polarizer are positioned perpendicularly, the bottom polarizer will block it. The light is visible to us (black pixel)

From the foregoing, we deduce:

1. Because it twists 90 degrees, TN is named the twist display.

2. Above, we see a positive presentation with black text on a white or grey backdrop.

Glass panels function in two ways. Positive mode: black characters on a background of white or gray; negative mode: black characters on a background of white or gray. Only 20% to 40% of light can get through a TN LCD due to polarization, which prevents the LCD from having a paper white background.

The Benefits And Drawbacks Of TN Display Technology


The production process is basic, and the materials that are used are of low cost. This results in a product that can be sold at a low price.

2. reduced power consumption: TN displays are well-suited for handheld and battery-operated devices because to the simplicity of their screen driving and refresh rates.

3. faster reaction times or speeds: TN LCDs are so versatile that they can even be used in gaming displays, welding helmets, and light shutters.

4. Extensive temperature range of operation TN LCDs are able to function properly in tough environments since their operating temperature range extends from -40 degrees Celsius to +90 degrees Celsius.

5.readable in direct sunlight: TN LCDs can be easily manufactured for use in applications that need readability in direct sunlight by employing reflecting or transflective polarizers.


1. Low Contrast Ratio: The contrast of TN display panels is not very high.

2. Display Angle: TN LCDs have a horrible viewing angle, particularly in one direction where it is absolutely unusable. This is especially true in one particular direction. As a consequence of this, we are required to mention in the application that the viewing angle of the TN LCDs is either six or twelve o'clock.

3. The limited multiplexing capacity of passive TN LCDs: As a consequence of this limitation, TN LCDs are typically utilized in applications that are not very complex or high-end. Some examples of these applications are affordable watches, utility meters, calculators, and other similar devices.

4.TN technology and TFT technology, both of which have achieved a great deal of commercial success in the market in recent years and are able to be utilized for high-resolution applications respectively. TN TFT LCDs are typically used for laptops, computer monitors, medical monitors, and other general-purpose displays, among other things, because of how affordable they are. TFT LCDs are another name for TN TFT LCDs. TN TFT LCDs are also known as TFT LCDs in the market.However, in the high-end market, display technologies known as IPS (In-Plane Switching) and VA (Vertical Alignment) are becoming more and more competitive with TN technology.Monitors with IPS screens have dramatically enhanced viewing angles, contrast, color saturation, and color reproduction as compared to monitors with TFT panels.The active matrix organic light-emitting diode, sometimes known as AMOLED, is becoming an increasingly serious competitor to TN TFT technology. Micro LED displays are in the process of being introduced to the market at the present time. Displays of the TN type active matrix TFT LCD kind are coming under increasing amounts of competitive pressure in the market for televisions with large screens. However, we believe that the low cost of TN displays, the low power consumption of TN displays, as well as the ease of production and use of TN displays, will keep them on the market for a very long time.




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