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Nokia explains ClearBlack Display (CBD) technology in detail

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You would have heard everyone talking about ClearBlack Display or CBD in Nokia devices but ever wondered what CBD or ClearBlack Display stands for in Nokia’s latest devices? Well Nokia has now taken all the pain to now explain about the technology it has been using lately in all its recently released and upcoming devices. 
 

Nokia-CBD-Polarisation
As Nokia states, ClearBlack display, uses a sequence of polarising layers to eliminate reflections. The image below can explain it a bit better. 


Nokia goes on to expain the process as below:

There’s both a linear polariser and retardation layers between the surface of your phone and the display. When light hits your screen, this is what happens:
  1. It hits the linear polariser, this vertically polarises the light. (Polarising means – roughly – aligning the wave vibration in a particular direction)
  2. Then it hits the circular polariser retardation layer. This converts the light again, making it right-circularly polarised.
  3. Then it hits the screen and bounces off it, switching the rotation of the light to leftist.
  4. It goes back through the retardation layer. When this happens, the light becomes horizontally polarised.
  5. Finally, it hits the linear polariser, since the light is horizontally polarised at this point it can be blocked entirely by this optical solution.
So why doesn’t the light from your phone’s display get blocked? Because it only goes through the second half of this journey so the light is unpolarised when it hits the final filter and goes through.
 
A few of the Nokia devices which use the ClearBlack Display technology are C6-01, 603, 701, X7 and E6. As time passes by expect more device to come with CBD. Read more about it over here.

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