The mechanism of the under display camera of Xiaomi Mi Mix 4 is as follows

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Xiaomi may have recently launched some crazy Mi Mix devices and concepts, such as the Mi Mix Fold and Mi Mix Alpha, but the company finally unveiled its flagship smartphone, the Mi Mix 4, in China this week. And well, it’s crazy as well. The highlight of Mi Mix 4 is that Xiaomi’s first smartphone has an under-display selfie camera..

Now that the under-display camera technology has recently emerged, many need to wonder – how does the Mi Mix 4 under-display camera work? Can I see it when using the phone? Well, that’s exactly what we’re exploring in this article today.

How the Xiaomi Mi Mix 4 Under Display Camera Works: Explanation!

Xiaomi’s implementation of under-display cameras is officially called CUP (Camera Under Panel) technology. The Chinese giant says it took five years, 60 patents, and an investment of over $ 77 million to develop this technology. also, This is a panel design 3rd generation camera, According to the official blog post.

Here, in order for the camera under the display to capture a photo, the panel covering the camera area must be transparent during the process. However, as you can imagine, it cannot always be transparent. Otherwise, it will stand out during use of the device and will not be better than punched holes or notch cameras. That’s why Xiaomi has implemented three innovative technologies to enable an under-display camera on the Mi Mix 4.

First, you Pixel arrangement of micro diamonds.. Reduce the pixel size of the display area that covers the camera sensor and increase the brightness of the pixels.What helps this achieve Uniform display quality and pixel density of 400ppi It provides a seamless viewing experience. When using the device, I can’t see the patch (or scratches) on the camera sensor. Helps hide the camera sensor on the Mi Mix 4.

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next, Redesigned circuit array, Plays the most important role in the function of the Mi Mix 4 under-display camera. This improves the transparency of the display that covers the camera zone and allows more light to pass through the panel.

This works together Transparent subpixel circuit It has a unique waveform pattern that helps minimize light diffraction. Xiaomi used indium tin oxide (ITO) material for the sub-pixel wiring of the Mi Mix 4 underdisplay camera. Then combine all of this with an imaging algorithm to output a usable photo. Here is a sample camera shared by Xiaomi on Weibo:

mi mix 4 camera sample

In summary, let’s take a closer look at the camera under panel (CUP) technology used in the Mi Mix 4.

The future of under-display cameras

Currently, under-display camera technology is still in its infancy. Phone makers continue their mission to provide a bezel-free, full-screen experience without being disturbed by users. It starts by minimizing the bezel, moving the selfie camera to the notch, then the punchhole, and now under the display.

Apart from Xiaomi, I’ve seen ZTE launch two commercial phones, the ZTE Axon 205G and Axon 30, with under-display cameras. Oppo also unveiled its second generation under-display camera technology. And Samsung today launches the Galaxy Z Fold 3, the first device with an under-display camera.

Samsung Galaxy Z Fold 3 Rendering
Image courtesy of 91Mobiles

Under display camera technology is new, so Image quality does not meet the standards of selfie cameras found on modern smartphones.. Enterprises use AI and machine learning algorithms to sharpen and brighten images from cameras under the display. Comparing today’s camera samples with photos of the concept of first-generation under-display cameras has made great strides. However, there is still room for improvement.

Well, in 2022, it is expected that the number of smartphones with under-display cameras with improved image quality will increase. But don’t expect technology to still penetrate the budget segment. Are you excited about mobile phones with under-display cameras like the Mi Mix 4 or do you like the notch? Let us know what you think in the comments section below.