Review and Tips

The most important aspect of the under-screen camera for success of smartphone_Part 1

With the camera under the screen, manufacturers can eliminate screen defects such as “water drops” or “charm moles”. But what will take the place of defects?

The world’s first “full-screen” smartphones appeared after years of waiting. Just like any other pioneering technology, the first generation of the camera under the screen has yet to deliver the perfect experience. ZTE, a Chinese company, was the first to initiate this trend when it unveiled the Axon 20 with a 32MP camera placed below the OLED screen. Just a few days later, Vsmart, Vietnam’s largest smartphone brand, also launched Aris Pro with a 20MP camera placed under a 6.4 inch AMOLED screen.

Right now, the biggest fear for this technology is image quality when the sensor under the screen will not be able to “catch” as much light as the “normal” camera. However, the real obstacle for this technology will be a factor that few people think about: the display quality of the smartphone screen.

Can’t be sharp

With ZTE Axon 20. In the screen area where the camera is located, the displayed image is noticeably blurred and there is even a change in background color.

What is the reason leading to this phenomenon? First of all, it should be pointed out that the camera under the screen is also essentially no different from the normal camera: the sensor still needs to “catch” the light, which is converted to RAW signal for the ISP chip to process into the final image file. When this sensor is placed under the screen, the amount of light reaching the camera is actually significantly reduced due to having to pass through the upper screen.

 

Light will never pass through a curtain seamlessly. Therefore, manufacturers are forced to create the most special components on “flawless” smartphones: screens with an image area with a smaller pixel density, creating gaps for light to pass through and to the sensor.

Last year, another Chinese smartphone maker Xiaomi announced a prototype for an under-screen camera design, and with Gizchina, the pixel density of the screen above the camera is only half that of the rest of the world. . According to our guess, the pixel density of this screen area on the ZTE is only 1/4. So, quality for image and screen (the top part of the camera) become two opposing factors . The less pixels in the screen area above the camera, the more light that passes through the camera, giving the image quality more impressive.

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