The trend toward larger smartphone screens and superior display technologies is undeniable. Yet, observant users might notice an ever-present "black border" between the screen and the device's edge, particularly noticeable on white-bodied phones. This stark contrast can be quite striking, leaving some puzzled about why this "black border" exists and whether it serves any purpose. Let’s delve into this topic.
Firstly, consider the ubiquitous nature of this black border across various electronic devices. Smartphones, as the most common example, come in a variety of colors, with white and black being the most popular choices. However, owners of white phones often feel frustrated by the apparent black border surrounding the screen. Conversely, those with black phones might assume they don’t have this issue, but this is merely an optical illusion due to the consistent color scheme.
Many mistakenly believe that the black border is exclusive to white phones or that it doesn't exist in other digital devices like tablets, computers, or TVs. This belief is incorrect. Every device with a screen has this black border, regardless of its hue or type. Whether it's a white, black, or colorful phone, the phenomenon remains constant. For instance, the white body appears more prominent against the black border, making it seem more pronounced, while the black body blends in, creating the illusion that the border vanishes.
Upon closer inspection, this black border is scientifically referred to as the BM (Black Matrix) area. Its purpose is not arbitrary but rather practical. The BM area serves to prevent light leakage, which could otherwise create unwanted glare around the screen edges. Without this area, slight misalignments during manufacturing could lead to visible colored glares, especially around the screen perimeter. While some phones exhibit significant light leakage due to poor assembly precision, the BM area helps mitigate these issues.
Additionally, the black border arises from the physical spacing between the internal components of the screen. Most screens consist of two layers—an inner display layer and an outer protective glass layer. The gap between these layers naturally results in a darker shadow along the edges.
In recent years, manufacturers have been striving to reduce the width of these black borders, pushing toward ultra-narrow bezels. Although this progress makes the black border less noticeable, it still technically exists due to the BM area. As technology advances, we can anticipate screens that appear borderless, offering a seamless viewing experience.
While the black border may seem inconvenient, its existence ensures a better user experience by reducing glare and light leaks. Future innovations will likely continue to refine this aspect, enhancing both aesthetics and functionality. Thus, while the black border may never fully disappear, its role in screen quality will remain vital.
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