What is LCD twisted nematic field effect?
LCD Twisted nematic field effect, also known as twisted nematic effect, mainly refers to the phenomenon that the long axis of nematic liquid crystal molecule is twisted 90 ° continuously between the upper and lower glass substrates. For a liquid crystal cell containing nematic liquid crystals with positive dielectric anisotropy and a cell thickness of about 10μm, its manufacturing principle is to make the long axis of liquid crystal molecules twist 90° continuously between the upper and lower glass substrates. Since the twist pitch is far greater than the wavelength of visible light, when linearly polarized light perpendicularly incident on the glass substrate passes through the liquid crystal cell, its polarization direction will rotate 90 ° along the twist direction of the liquid crystal molecule.
When such a liquid crystal cell is placed between two parallel polarizers, light can pass through. This is the working principle of twisted nematic liquid crystal display element, which can display white background patterns or black background white patterns. If the molecular long axis of nematic liquid crystal is continuously twisted 180 °~270 ° between the upper and lower glass substrates, it is called “super twisted nematic effect”.
In practical applications, twisted nematic field effect is widely used in liquid crystal displays. Twisted nematic liquid crystal display (TN-LCD) realizes image display by controlling the twist degree of liquid crystal molecules. When the electric field is applied to the liquid crystal molecules, the liquid crystal molecules will rearrange, reducing the twist angle, so that the light through the liquid crystal layer can be transmitted. In this way, TN-LCD has only two states: active and inactive, thus realizing image display.
Twisted nematic liquid crystal display (TN LCD) has the advantages of high brightness, high contrast, vivid color and fast response speed, but it also has some disadvantages, such as small viewing angle and limited viewing angle.
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