What is the Difference Between TN and STN?

 Categories: BASIC KNOWLEDGE
 Time of issue: 2020-02-24 16:43:49
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Description: Twisted Nematic (TN) and Super Twisted Nematic (STN) are the terms used to describe two types of liquid crystal displays.

Twisted Nematic (TN) and Super Twisted Nematic (STN) are the terms used to describe two types of liquid crystal displays. TN displays have a twist ( the rotation of the molecules from one plane of the display to the other) of 90 degrees or less. All passive direct drive , active matrix, and most passive low level (x2 to x32) multiplexed LCD's have a 90 degree twist.

As the name implies, Super Twisted Nematic LCD's have a twist that is greater than 90 but less than 360 degrees. Currently most STN displays are made with a twist between 180 and 240 degrees. The higher twist angles cause steeper threshold curves which put the on and off voltages closer together. The steeper thresholds allow multiplex rates greater than 32 to be achieved.

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TN STN

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