Dr Pan:Welcome to DISPLAY Museum. I am Dr Pan, the curator of Museum.

Greg: Hello, Dr Pan. I am Greg. I came here to learn about STN LCD Screen. 

Dr Pan: Hello, Greg.  STN is the abbreviation for Super Twisted Nematic. The main difference between TN, HTN, STN and FSTN LCD is the view angle. From the definition, the maximum view angle of STN LCD is 210~255 degree. Take this STN positive LCD for example. The view angle is 12 o’clock direction and it can be seen very clearly in the full view angle: 12 o’clock direction, 3 o’clock direction, 6 o’clock direction, 9 o’clock direction and the front side.

 When it is a positive and reflective display, it can display without LED backlight; when it is a positive and transmissive/ transflective display, it can’t display without LED backlight, we have two options for the background color: grey background and blue letters, yellow-green background and black/blue letters.

When it is a negative and transmissive/ transflective display, it can’t display without LED backlight, the background is blue and the color of the letters is the color of LED backlight.

By the way, no matter it is a positive or negative display, the background color is affected by the color of LED backlight on some level. That is why the color of LED backlight is usually white.

Theoretically, we can add a blue film to STN negative LCD, it may look like this. Actually, it is barely used because of the high price.

The maximum COM is 64,so it is very suitable for the large dot matrix (640*480), complicated and high-end devices.

Greg: Thank you, Dr Pan. Now I got it.

Dr Pan: Welcome to contact us if you have any question.