Fingerprint Sensor Types Explained – Side vs Under Display in Bangladesh
Fingerprint sensors have become a standard feature on smartphones, replacing older methods like PINs and patterns for most users. In Bangladesh, where smartphones are used constantly for communication, mobile banking, and social media, fast and reliable unlocking is important. Today’s smartphones mainly use two types of fingerprint sensors: side-mounted sensors and under-display sensors. While both serve the same purpose, the experience they offer can be quite different.
Side-mounted fingerprint sensors are usually built into the power button on the side of the phone. This design became popular as manufacturers moved away from rear-mounted sensors and aimed for cleaner back designs. One of the biggest advantages of a side fingerprint sensor is speed. Because the sensor is directly exposed and easy to touch, it often unlocks the phone instantly. Many users appreciate how natural it feels, especially when picking up the phone with one hand.
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In everyday Bangladeshi usage, side fingerprint sensors are very practical. Whether you are unlocking your phone while walking, standing in a bus, or checking messages quickly, your thumb or index finger naturally rests near the power button. This makes unlocking fast without needing to look at the screen. Side sensors also tend to work reliably even when fingers are slightly sweaty, which is common in Bangladesh’s warm and humid weather.
Under-display fingerprint sensors, on the other hand, are placed beneath the screen. These sensors allow the front of the phone to look more modern and uninterrupted, which is why they are common in mid-range and premium devices. To unlock the phone, users place their finger on a specific area of the display where the sensor is located.
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The main appeal of under-display fingerprint sensors is design. Phones with this technology usually have slimmer bezels and a more premium appearance. For users who value aesthetics, this can be an important factor. Under-display sensors also make it easier to keep the phone’s sides clean and minimal, which some people prefer.
However, under-display sensors can be slightly slower than side-mounted ones, especially optical sensors commonly found in affordable and mid-range phones. They require the screen to light up and read the fingerprint through the display. In bright sunlight, which is common in Bangladesh, visibility can sometimes be an issue, making finger placement less intuitive.
Accuracy is another important consideration. Side-mounted fingerprint sensors are generally very accurate because they capture a clear fingerprint image. Under-display sensors have improved a lot in recent years, but they can still struggle if the finger is not placed correctly or if the screen protector affects sensitivity. Many Bangladeshi users use screen protectors, which can sometimes reduce the reliability of under-display sensors if not applied properly.
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Durability also matters. Side-mounted fingerprint sensors are physical components exposed to regular use, but they are usually built to handle frequent pressing as part of the power button. Under-display sensors are protected under the screen, reducing physical wear, but they rely heavily on software and display quality for consistent performance.
From a budget perspective, side-mounted fingerprint sensors are more common in affordable smartphones in Bangladesh. They offer excellent performance without increasing manufacturing costs significantly. Under-display fingerprint sensors are usually found in higher-priced devices and can contribute to a higher overall phone price in BDT.
Choosing between the two often depends on personal preference and usage style. If you prioritize speed, reliability, and ease of use, especially in outdoor or one-handed situations, a side-mounted fingerprint sensor is often the better choice. If you care more about a modern look and are comfortable with slightly slower unlocking, an under-display sensor can be appealing.
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Conclusion
Both fingerprint sensor types are secure and convenient. For most Bangladeshi users, side-mounted sensors offer faster and more reliable unlocking, while under-display sensors suit those who prefer a sleek, modern phone design.