Under a sun screen is a very troublesome thing, often with his hand blocking the Sun's rays can see screen content. Cause under the Sun see the screen because of the content of the screen glare than light reflected from the screen light display light intensity, we can be hard to see the screen clearly. Facing the outside can't see screen problem, the simplest way is to increase the brightness of the screen. But relying solely on increasing the brightness of the screen to save power. Now screen is a large power consumption in mobile phone spare parts, if you increase the brightness of the screen, will only result in a shorter renewal time.
In order to solve this problem does not affect the battery life of the phone, Nokia uses a Hyatt ClearBlack display technology. At present, the technology has been used in the Lumia 920, Lumia 800 phone. Image on the left is using a Nokia ClearBlack, is not made to the right of the C6-01 prototype using this technology, we can see the picture on the left of the screen content can be seen, and the right of the cell phone screen is white, cannot see the contents.
Nokia said the technology can make screens in the Sun remained the same as indoor results, and this kind of technology and Polarized Sunglasses similar to the polarizer is the display layer is more complicated than sunglasses. On a sunny day, if you don't have a polarized light eyes looking directly at the water, under the influence of surface reflection you don't see anything below the surface, cell phone screen is the same way. How exactly this is a technology, let us take a look at it.
Nokia has on the official blog of this technology has been introduced, in the figure below, we can see three layers, three include linear polarization, one-fourth wave slow film (quarter-wave retardation film) and the reflector. When the light after the polarizer, the following situation can occur: Kenzo iPhone Case Kenzo iPhone cover
Arrive in linear polarization of light layer, this layer allows vertically polarized light. Then arrived in circular polarized light delay film. This layer can once again change the direction of the light, and right circularly polarized light. Reflections from the screen and then arrive at the screen, is rotated to the left. And then again after a slow film, becomes a horizontal polarization. Eventually arrived in linear polarization of light, due to the light at this point in a horizontal polarization, so the layers can completely block out the light.
So why won't stop when the display of the polarization of light? Because the light on the screen after only a half of the distance, so the light from the screen can arrive at people's eyes.