Under Display Camera fully explained.


Phone manufacturers try all kind of methods to make their phones appear Bezel-less, or to increase the screen to body ratio. Including big notch, which makes the phone look ugly and including wallpapers to hide the notch, Pop up cameras, which may comprise on phone durability and punch hole displays, which is slightly better than notch but not a true solution for the full bezel-less screen.

Now lets us know why we need notch/bezel?

We need notch/bezel to fit in these components
  • Earpiece
  • Proximity sensor
  • Ambient sensor
  • The most important one "front facing camera"

The first 3 components above can somehow be hidden under the screen but the main issue is with the front-facing camera.

So, to solve this issue and to make a truly bezel-less smartphone. Some leading smartphone brands like Xiaomi and Oppo found a solution by embedding the front-facing camera under the phone's display. And they call it under display camera.

Before we know how this technology works, we need to know about the display that is used to make under display cameras possible.

There are two types of displays that are mainly used across all smartphones.

     1. IN-PLANE SWITCHING DISPLAY [IPS]      
                                 (or)      
         LIQUID CRYSTAL DISPLAY [LCD]

    2.    ACTIVE MATRIX ORGANIC LIGHT EMITTING DIODE DISPLAY [AMOLED]


Now let's talk about the first one, IPS display




IPS displays work by a having backlight source which is always on and then passing the light from this source through liquid crystal screen which will allow, block or change the colour of the light and this is why these types of displays are also called liquid crystal displays or LCD'S

It's time for the second one, AMOLED display




These displays don't have a backlight source or a layer to convert it but rather have organic light emitting diode which is of the size of the individual pixels and can be turned on or off and produce different colours by itself.

So, they are just a single layer and also considered better than the IPS displays due to the control over the light on each individual pixels and also for higher contrast ratio.

So now we have understood the different types of displays. It's time to talk about under screen cameras.

There are two types of methods through which we can achieve under display cameras


  1. TRANSPARENT AMOLED.
  2. MICRO PHOTO SENSORS.

Now let's talk about the first one, Transparent AMOLED.

 In this method, we can achieve under display cameras by manufacturing the screen emitting diode in such a way that the individual pixels that are Infront of the camera will become Transparent when the front-facing camera is turned so that it can act as a lens which allows light into the camera to click photos or shoot videos.

But this is done only with AMOLED displays as IPS displays have an obstructing backlight.

 It's time for the second one, Micro Photo Sensors

In this method 1000s of Micro Photo Sensors of the size of individual pixels which will effectively form part of the screen and be invisible to the naked eye, the outputs of all these tiny cameras then processed into a fine image but this method is still under research.

Now like anything else the under display cameras also has some advantages and disadvantages.

ADVANTAGES


  • The ability to make truly bezel-less mobile phones.
  • No notches, just clear screen.


DISADVANTAGES



  •  Difficulty in making a truly Transparent OLED screen.
  • The quality of the photos or videos will be less.
  • The high cost of production.

So will you pay extra Money for under displays camera?
Write your answer in the comments section below and also mention on which topic do you want to see the next post.

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