Lab – Samsung Galaxy Z Fold 4: zoom on the screen covering the sensor for selfies

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Samsung claims to have increased the pixel density of the panel that covers the “under-screen” photo sensor on its Galaxy Z Fold 4. Before publishing our test, zoom in on this detail, which represents a real technical challenge for the manufacturer.

Samsung Galaxy Z Fold 4

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Samsung Galaxy Z Fold 3


Samsung Galaxy Z Fold 3
we tested, we liked

Note Digital

Editor's rating: 4 out of 5

Rating: 3 out of 5

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Samsung unveiled last year, on its Galaxy Z Fold 3, a feature that is still rare on smartphones: a photo module located below the main screen of its folding model. The sensor, which displays 4 megapixels, was covered by the plate, the pixel density of which, however, had been reduced to let in enough light for the resulting images to be usable.

Samsung Galaxy Z Fold 4

The Korean continues in the same way this year, but with a pixel density that it promises, increased over its photo module, whose definition remains fixed at 4 megapixels. The idea is therefore that it should be even more discreet on the screen of the Galaxy Z Fold 4, as more pixels are turned on when it is used.

But Samsung does not attach any numbers to these statements. A tour of our laboratory, and we now see more clearly.

More (new) pixels

The Galaxy Z Fold 4 features the Amoled “Diamond Pixel” display used last year on the Galaxy Z Fold 3, featuring green, red and blue sub-pixels of different sizes and arranged diagonally, which Samsung has used since nearly a decade his Galaxy S.

Samsung Galaxy Z Fold 3

Galaxy Z Fold 3 and its photo sensor under the screen.

The part covering its front photo module adopts a different sub-pixel structure. On the Galaxy Z Fold 3, these were arranged as square blocks that included two lines each with a blue subpixel and a red subpixel, flanking four green subpixels. These pixels were organized as perpendicular grids in a square of 14 x 14 pixels.

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Samsung Galaxy Z Fold 4 selfie camera

The part of the screen that covers the 4 megapixel photo sensor on the Samsung Galaxy Z Fold 4.

© The Digital

Change course on the Galaxy Z Fold 4. Two elements are different. First the structure of pixels: this time they have a sub-pixel of each color, the largest remaining green. They are probably smaller as they fit into a 20 x 20 pixel square, and are mostly offset. This results in a diagonal alignment which increases their number: while we noticed the presence of 172 pixels on the screen covering the photo module on the Galaxy Z Fold 3, there are 308 on the Galaxy Z Fold 4.



Samsung Galaxy Z Fold 4


Samsung Galaxy Z Fold 3

It should also be noted that this new pixel organization allows Samsung to offer a screen area that is slightly more discreet to the eye, as the “grid” effect that was visible last year is less, and also offers softer contours: this space is no longer a square with slanted edges, but a circle. And given that pixels need to have a distance to let light through, the boundary is not yet invisible…

Images affected by this new part of the screen?

With a higher pixel density and likely less light to harvest, are the images obtained with the Galaxy Z Fold 4 camera of lower quality? Remember here that Samsung does not consider this module as a full-fledged camera, but as a sensor that allows occasional video conferencing; The 10-megapixel photo module, hidden in a punch on the front screen, is much more suitable for selfies. Nevertheless, to know what it is all about, we have made some indicative images in our laboratory. Those of the Galaxy Z Fold 3 were made at the same time with an updated smartphone.



  • Samsung Galaxy Z Fold 4 – daytime photo | © The Digital

4 pictures

Nice surprise: if the sharpness is far too low for these images to really be usable as is, it’s clear that the images of the Galaxy Z Fold 4 are better exposed than the predecessor’s images and slightly more detailed. The software processing used by Samsung, which compensates for a smaller light supply, is undoubtedly there for a large part. In short, the technology of the “photo module under the screen”, if it still looks like a gadget, wins in discretion and slowly improves its photo results, which in itself is already good.

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