Grey Background and Black Letters Positive Reflective Display TN LCD Screen
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 TN LCD Screen.
Dr Pan: Hello, Greg. TN is the abbreviation for Twisted Nematic.
Dr Pan: The main difference between TN, HTN, STN and FSTN LCD is the view angle.
Dr Pan: From the definition, the maximum view angle of TN LCD is 90°.
Dr Pan: Take this TN positive LCD for example. The view angle is 6 o’clock direction and it can be seen very clearly in the 6 o’clock direction and the front side.
Dr Pan: When it is a positive and reflective display, it can display without LED backlight;
Dr Pan: when it is a positive and transmissive/ transflective display, it can’t display without LED backlight, the background color is grey and the letters are black.
Dr Pan: When it is a negative and transmissive/ transflective display, it can’t display without LED backlight,
Dr Pan: the background color is purple-black, different colors from different view angle, and the color of the letters is the color of LED backlight.
Dr Pan: 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.
Dr Pan: That is why the color of LED backlight is usually white.
Dr Pan: Theoretically, we can add a blue film to TN negative LCD, it may look like this.
Dr Pan: Actually, from our experience, no one has done it before since HTN or STN negative LCD with blue background looks better with wider view angle.
Dr Pan: TN LCD is the most commonly used since it is the cheapest.
Dr Pan: The maximum COM is 4, so it can’t display too many segments, and it can’t be used in the high-end devices.
Dr Pan: But it performs very well in the simple display content: calculator and alarm clock.
Greg: Thank you, Dr Pan. Now I got it.
Dr Pan: Welcome to contact us if you have any questions.