Ethan Clarke
Wireless charging is a convenient way to charge your phone without wearing down the USB port. It works through electromagnetic induction, where an alternating current (AC) is passed through a copper coil, generating a magnetic field. This magnetic field induces a current in the receptive coil of the device being charged. Metal cases block these electromagnetic signals, so wireless charging won't work with metal phone backs. Plastic, on the other hand, does not interfere with the electromagnetic field, so it is a suitable material for wireless charging. While plastic phone backs are typically associated with cheaper phones, some higher-end phones, like the Google Pixel 5 and the Galaxy Note 20, have plastic backs and wireless charging capabilities.
| Characteristics | Values |
|---|---|
| Plastic considered low-quality material | Only suitable for cheap phones |
| Plastic phones | Not common |
| Plastic backs | Work fine for wireless charging |
| Plastic backs | Do not interfere with the electromagnetic field |
| Plastic backs with wireless charging | HTC Droid DNA, Nexus 5, Pixel 5, Galaxy Note 20 |
| Metal backs | Interfere with electromagnetic signals |
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What You'll Learn
Plastic phone backs are compatible with wireless charging
While plastic phone backs are compatible with wireless charging, they are not commonly used in high-end phones. Plastic is often considered a low-quality material unsuitable for expensive phones. As wireless charging is typically seen as a premium feature, phone manufacturers tend to use materials like glass or aluminium that are perceived as more premium.
However, there are some advantages to plastic phone backs. Plastic is more durable than glass, which can crack or shatter if a phone is dropped. Plastic phone backs can also provide a better grip and a more comfortable feel in the hand compared to glass.
Additionally, plastic phone backs can offer more design flexibility. They can be made in various colours and finishes, allowing for more customization options. Plastic is also generally lighter than glass, making the phone overall more lightweight and comfortable to hold.
While plastic phone backs are compatible with wireless charging and offer certain benefits, the perception of plastic as a lower-quality material has led to its limited use in high-end smartphones.
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Metal phone cases block electromagnetic signals, disrupting wireless charging
Wireless charging is based on the principle of electromagnetic induction. It involves passing an alternating current (AC) through a copper coil, which generates a magnetic field in the immediate vicinity. This magnetic field induces a current in the coil of the charger, which is then fed into the battery. While this technology is incredibly convenient, it does come with some caveats.
One of the main disadvantages of wireless charging is that it does not work well with metal phone cases or backs. Metal is known to block electromagnetic signals, which are crucial for wireless charging to function properly. As a result, placing a metal object between the charger and the phone can disrupt the electromagnetic induction process and slow down or even prevent charging.
To address this issue, smartphone manufacturers have switched from metal to glass or plastic backing for their devices. For example, Apple transitioned from aluminum to glass backing for iPhones to ensure compatibility with wireless chargers. Similarly, the Galaxy Note 20 from Samsung has a plastic back, wireless charging capabilities, and NFC.
It is worth noting that while wireless charging can work with phone cases, thick cases, especially those made of metal, can interfere with the charging process. Therefore, it is recommended to use cases that are no thicker than 3mm to ensure efficient wireless charging. Additionally, MagSafe-compatible cases offer fast wireless charging and easy attachment to MagSafe accessories, providing both convenience and functionality.
In conclusion, metal phone cases or backs can disrupt wireless charging due to their ability to block electromagnetic signals. This has led to the adoption of alternative materials, such as glass or plastic, for smartphone backing to ensure compatibility with wireless charging technology.
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Glass phone backs are more fragile and prone to cracking
On the other hand, glass phone backs are more susceptible to cracking. While glass is hard and scratch-resistant, it is more likely to crack or break than plastic. Glass phone backs are also more prone to scratching and peeling over time due to regular wear and tear.
Plastic phone backs are considered more durable than glass phone backs. Older smartphone models, such as the Blackberry Curve and Bold, were praised for their durability and ability to withstand drops without cracking the screen, thanks to their plastic construction.
Glass phone backs, however, are more fragile and prone to cracking when dropped or subjected to impact. Many users have reported cracking the back glass of their phones, even when kept in a protective case. The tension in one's pocket or purse, where phones are often stored, could also cause the glass back to shatter unexpectedly.
While glass phone backs offer aesthetic and performance advantages, such as wireless charging capabilities and a luxurious appearance, they come with the trade-off of being more fragile and susceptible to damage.
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Plastic is not considered a premium material
One reason why plastic is not considered premium is because of societal norms and perceptions. Consumers often associate plastic with cheapness and inferior quality, especially when compared to materials like glass or metal. This perception may be influenced by the widespread use of plastic in low-cost, fast-moving consumer goods, as well as its prevalence in landfills, contributing to environmental concerns.
Historical factors have also played a role in shaping the perception of plastic. When Apple first used plastic in iPhones, it became a status symbol due to the device's high price and limited availability. This association between plastic and lower-cost options may have been further reinforced by tech writers and reviewers who claim that plastic back phones are inferior or boring. Additionally, luxury brands have traditionally used materials like glass or metal, which are considered more luxurious and exclusive.
From a manufacturing perspective, plastic may not be seen as premium because it is often used in sealed devices, which are less expensive to produce and may offer cost savings by not including a removable battery. Additionally, plastic is associated with ease of production and low cost, making it a common choice for mass-produced goods.
However, some consumers appreciate the advantages of plastic for mobile devices, including its lightweight, flexibility, shock absorption, radio signal transparency, and ease of coloring and shaping. These features could potentially enhance the user experience and provide a more premium feel, especially when compared to the fragility of glass or the signal interference of metal.
To change the perception of plastic as a non-premium material, manufacturers and designers could focus on showcaseing the benefits of plastic, such as its durability, sustainability, and versatility. By emphasizing these advantages and combining them with premium imagery and design aesthetics, it may be possible to elevate the perception of plastic in the eyes of consumers.
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Wireless charging works through electromagnetic induction
Wireless charging is a convenient way to charge your devices without having to plug them in. It works through electromagnetic induction, which involves passing an alternating current (AC) through a copper coil, generating a magnetic field in the immediate vicinity. This magnetic field then induces a current in the coil of the charger, which is fed into the battery. This process is why wireless charging is compatible with plastic phone backs—plastic does not get in the way of the electromagnetic field, unlike metal, which blocks these signals.
Wireless charging is now a common feature, with charging pads found in coffee shops, car dashboards, and even mousepads. While it is a convenient way to charge devices, wireless charging does have some downsides. For example, it is less efficient than traditional wired charging, and there are differences in performance between devices.
The use of plastic in phone design is often associated with cheaper phones, and it is not considered a premium material. This perception may be one of the reasons manufacturers opt for glass backing on higher-end phones. Glass is also favoured for its aesthetic appeal and the impression of quality it gives to customers in stores.
However, glass backing comes with its own set of issues. Glass-backed phones are more fragile and prone to cracking or shattering when dropped. This has led to a booming phone repair business. Despite claims of shatter-resistance, glass-backed phones can still be considered a liability, especially on devices costing several hundred to a thousand dollars.
Some phone models with plastic backs and wireless charging include the HTC Droid DNA, Google Pixel 5, Nexus 5, and Galaxy Note 20. While plastic may not be as prevalent as glass in flagship phones, it does offer a durable alternative that supports wireless charging functionality.
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Frequently asked questions
Plastic backs are not required for wireless charging to work, but they are often used because metal blocks electromagnetic signals, which are used in wireless charging.
Plastic is a suitable material for wireless charging as it does not block electromagnetic signals. However, it is considered a low-quality material and is not preferred by customers. Glass is another option, but it is fragile and can easily crack or shatter.
Yes, manufacturers can use other materials such as polycarbonate or aluminum. Cases can also be used with wireless charging, as long as they are not too thick.
