The dream of a bezel-less, uninterrupted screen has driven smartphone design for a decade. While notches, punch-holes, and pop-up cameras were useful stepping stones, the ultimate destination is Under-Display Camera (UDC) technology. In 2026/2027, UDC is moving from experimental flagships into mainstream devices as display and AI technologies solve historical image quality issues, paving the way for a true full-screen future.
This article explains how under-display cameras work, the engineering breakthroughs behind them, and when they will replace the standard punch-hole camera. Explore display technology updates at the W3C Main Site.
The UDC Challenge: Screen Transparency vs Display Quality
The primary challenge of UDC is simple physics: a camera sensor needs light to take a photo, but a screen needs pixels to display an image. If you remove pixels to let light through, the screen over the camera looks blurry, pixelated, or lower-resolution. If you keep high pixel density, the camera sensor receives almost no light, resulting in dark, noisy, and unusable photos.
Early implementations suffered from the “screen door” effect, where the camera area was clearly visible as a low-resolution patch on the display. To achieve a seamless look while maintaining camera quality, engineers had to redesign both the display backplate and the sub-pixel layout, balancing light transmission with display uniformity.
Core Technical Breakthroughs Powering Modern UDC Sensors
Modern UDC systems rely on three key innovations that bridge the gap between display engineering and digital imaging.
First, **Transparent Cathode Materials** use new chemical compounds that allow display backplanes to be structurally sound while remaining highly transparent to light waves. Second, **Dynamic Pixel Switching** allows the display area over the camera to dynamically reduce its resolution when the camera is active, then switch back to full resolution when you are viewing content. Third, **AI Diffraction Correction** uses deep learning to reconstruct the image. For details on how fast charging coordinates with these new screen designs, see the Best 5G Phones Under 20,000 India Guide.
Additionally, camera sensors used in UDC configurations are designed with larger physical pixels to maximize light capture. By using Quad-Bayer or Nona-Bayer color filter arrays, these sensors can bin pixels together to reduce noise in challenging lighting conditions, relying heavily on software processing to upscale the final resolution.
Transparent Anode and Cathode Chemistry
To let light reach the sensor, the electrical lines that power the pixels must be transparent. Traditional OLED panels use indium tin oxide (ITO) for anodes and reflective metals for cathodes. In modern UDC panels, researchers use ultra-thin transparent conductive oxides and specialized organic compounds that allow up to 60% of incoming light to pass through the panel, a massive improvement over the 15% transmission rates of early prototypes.
Dynamic Sub-Pixel Resolution Adjustments
Rather than having a static low-resolution zone, modern displays can dynamically adjust their pixel density. When the screen displays static content, the pixels over the camera run at a high density, matching the rest of the screen. When the selfie camera is activated, the display controller turns off or reduces the brightness of specific sub-pixels in that zone, increasing the gaps between active pixels and allowing more light to pass through to the camera sensor below.
AI-Powered Diffraction Correction: Neural Restoration in Action
Because the light passing through the display panel to the camera sensor is diffused and diffracted by the sub-pixel grid, raw UDC images appear low-contrast, hazy, and exhibit significant color fringing. To solve this, phone manufacturers employ deep-learning restoration networks running locally on the chipset’s NPU. These neural networks are trained on pairs of corrupted and clean images, learning to identify and remove the specific visual artifacts created by the display panel.
The AI models restore edge sharpness, clean up digital noise, reconstruct lost highlight details, and balance colors in real time. The quality of a UDC camera is now determined just as much by the software reconstruction models as it is by the physical camera sensor. Without high-TOPS NPUs, real-time UDC video calls would be impossible.
UDC Technology Comparison by Brand
Different manufacturers have taken distinct approaches to balancing UDC selfie quality with display seamlessness.
| Brand / Implementation | Pixel Density over Camera | Light Transmission | Selfie Quality Rating |
|---|---|---|---|
| ZTE (Under-Display Gen 5) | 400 PPI (Seamless) | ~60% | 7/10 (Usable) |
| Samsung (Fold Inner Screen) | 220 PPI (Slightly visible) | ~40% | 5/10 (Video calls only) |
| Xiaomi (CUP Technology) | 380 PPI (Near-seamless) | ~55% | 6.5/10 (Decent) |
| Standard Punch-Hole (Reference) | 0 PPI (Cutout) | 100% | 10/10 (Excellent) |
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Frequently Asked Questions
Q1: Can you see the camera under the screen?
In the latest 2026/2027 implementations, the camera area is near-invisible under normal viewing conditions. You may notice a slight grid pattern at extreme angles or on pure white backgrounds, but during video playback, gaming, or general browsing, the screen looks completely uniform.
Q2: Are UDC selfies as good as standard front cameras?
Not quite. Standard front cameras have an open glass cutout, receiving 100% of available light. UDC sensors receive less light, meaning UDC selfies have slightly lower dynamic range and more processing artifacts in low light. However, in daylight, the gap is closing rapidly due to AI processing.
Q3: Do under-display cameras support Face Unlock?
Yes. Basic 2D Face Unlock works fine because modern algorithms can parse facial features even through the display grid. However, 3D secure mapping (like Apple’s Face ID) requires more precise infrared light data and is not yet commercially viable under a display panel.
Q4: When will Apple adopt UDC on the iPhone?
Industry analysts expect Apple to keep the Dynamic Island cutout for a few more years. Apple requires exceptionally high standards for Face ID security and selfie quality, meaning an under-display Face ID system is unlikely before late 2027 or 2028 when transparent display tech matures.
Conclusion
Under-display camera technology has matured from an experimental gimmick into a viable flagship feature. By combining advanced transparent materials with neural network image reconstruction, manufacturers are successfully eliminating the camera cutout without sacrificing screen quality. As NPUs become faster and display chemistry improves, the punch-hole will soon become a relic of the past, giving way to a true full-screen future.
