What is CBD screen technology?

Nokia's screen technology is Clear Back Display, abbreviated as CBD screen. CBD is not a brand new display technology. It is actually a way to reduce screen reflections and improve the quality of the view. Especially in the outdoor environment, ClearBlack display ensures that the black you see is true black, so it also improves the contrast of the display, making the whole picture look easier, similar to the effect of a pair of polarized glasses. So that we can clearly see the contents of the screen both indoors and outdoors.

Currently, this kind of screen technology is embodied in the high-end products including the Windows Phone Lumia series and the N9 and N8, which can perform better in the sun. The Nokia BLOG recently revealed some details of this technology for us to better understand. In short, the CBD screen uses internal polarization effects to prevent sunlight from reflecting into the human eye.

The principle of the CBD screen is divided into the following steps:

1, the light is irradiated on the polarizer, and the polarizer polarizes the light vertically, which simply means that the light wave vibration is directed to a specific direction for deflection.

2. Light is irradiated on the cyclic polarization retardation layer. The delay layer again changes the direction of the light's vibration and achieves light polarization.

3, then the light hits the screen layer and produces a rebound.

4. The light enters the retardation layer, and the light is horizontally directed after passing through the retardation layer;

5. Finally, the light is irradiated on the linear polarizer, because the light has been directly exposed at the same time, so it is completely blocked by the linear polarizer;

It seems that starting in 2012, Nokia began to pay attention to technical research and development. The addition of the CBD screen also allows Nokia to have a war on the high-end screen. It is believed that the road ahead will be wider and wider.