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What is the difference between normally black and normally white LCD screens? Date:2018-06-26 / Written by: Topfoison / Read: 471

The white LCD is called NW (Normally White) LCD screen. For such LCD, when the voltage is not applied, the liquid crystal translucent displays the bright picture; when the voltage is applied, the liquid crystal is opaque and dark.
 
The constant black liquid crystal display is referred to as NB (Normally Black) LCD screen. For such LCD, when the voltage is not applied, the liquid crystal is opaque and dark. When the voltage is applied, the liquid crystal translucent and displays a bright picture.

For the TN liquid crystal display, the alignment film of the upper and lower glass is perpendicular to each other, and the difference between the NB and the NW liquid crystal is only the relative position of the polarizing plate. For the NW, the polarity of the upper and lower polarizing plates is perpendicular to each other, so when the voltage is not applied, the light line will transvious to the 90 degree of rotation of the liquid crystal. For the NB LCD screen, the polarity of the upper and lower polarizers is parallel to each other, so when the voltage is not applied, the light will not pass through the liquid crystal because it rotates 90 degrees.

Why are there two different polarizer configurations for NW and NB? Mainly for different application environment, generally used in desktop computer or notebook computer, most of the configuration of NW, this is because the general computer software running the whole screen is mostly bright, that is, mostly white black, since the bright spot is the majority, so that the use of NW is more convenient, and the bright spot of NW It does not need to add voltage, and it will save electricity when used. Otherwise, NB will be applied to mostly black screen applications.