Sonytek Display Co., Limited

Introduction to the liquid crystal inside the TN/HTN LCD screen

Time：2023-09-21

Most of the liquid crystal display components used in pen-segment digital displays are TN or HTN LCD screens. The basic structural principle of the TN/HTN type liquid crystal display component is: photoetch a certain transparent electric plate pattern on the glass coated with the ITO transparent conductive layer, and clamp the front and rear glass substrates with the transparent conductive electrode pattern. The upper layer of liquid crystal material of the nematic LCD screen with positive dielectric anisotropy is tightly sealed around it, forming a flat liquid crystal box with a thickness of only a few microns.

The exposed part of the LCD screen is a common liquid crystal LCD display. The liquid crystal display components used in common wrist watches, digital instruments, electronic clocks and most calculators are TN/HTN type LCD screen components. Because of this, this component should be the LCD screen liquid crystal display that many people are well aware of.

Twisted nematic phase (TN) occurs because the glass of the LCD screen is coated with an orientation layer film and subjected to orientation treatment. The LCD liquid crystal molecules in the box are arranged in parallel along the surface of the glass. However, because the orientation processing directions of the inner and outer alignment layers of the two pieces of glass are perpendicular to each other, the LCD liquid crystal molecules are twisted at 90° between the two pieces of glass. This is the origin of the name of the twisted nematic liquid crystal display component.

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