Why choose metal for the back cover of a bar-type display?

When you hold a bar-type display in your hands, you will notice its considerable weight. This might lead you to wonder: wouldn't it be possible to reduce the weight by simply switching the back cover material to plastic?

In reality, the use of a metal back cover for bar-type displays is driven by five core requirements-heat dissipation, structural strength, electromagnetic shielding, protective sealing, and grounding safety-all of which are difficult for plastic to satisfy simultaneously. Let's look at the specific reasons for each requirement:

1. Superior Heat Dissipation (The Most Critical Factor)

Bar-type displays are long and narrow, contain numerous LED strips, and feature concentrated power consumption, making them prone to heat accumulation.

• Metal (specifically aluminum or iron) possesses a thermal conductivity hundreds of times greater than that of plastic, allowing it to rapidly draw heat away from the LED strips and PCBs for effective dissipation.

• Metal can be fabricated with heat-dissipating fins or grooves to increase the surface area for cooling, thereby preventing high temperatures from causing brightness decay, color drift, or a shortened product lifespan.

2. High Structural Strength and Resistance to Deformation

Bar-type displays are slender and span considerable lengths; plastic, being prone to bending and warping, would lead to uneven stress distribution across the screen, resulting in light leakage or "black screen" failures.

• Metal back covers offer high rigidity and exceptional tensile/compressive strength, ensuring the display remains perfectly flat over the long term and resists deformation during transportation or installation.

• They provide excellent vibration and shock resistance, making them ideal for use in environments prone to movement or physical impact-such as industrial settings, in-vehicle applications, and outdoor installations.

3. Electromagnetic Shielding + Grounding Safety

Bar-type displays utilize high-frequency driving circuits, making them both susceptible to external interference and prone to emitting interference themselves.

• A metal back cover acts as a Faraday cage, shielding the internal components from external electromagnetic interference to prevent screen flickering or display glitches, while simultaneously suppressing the leakage of the display's own internal signals.

• Metal allows for reliable electrical grounding, providing protection against static electricity and electrical leakage to significantly enhance overall safety.

4. Protective Sealing (Dust and Water Resistance)

• Metal facilitates the creation of fully sealed structural enclosures; when combined with waterproof gaskets, these enclosures can achieve IP65 or IP67 protection ratings, offering robust resistance against dust and moisture-making them perfectly suited for outdoor or industrial environments.

• Metal exhibits excellent resistance to aging and corrosion, ensuring that the back cover remains free from yellowing or becoming brittle even after prolonged use.

5. Installation and Manufacturing Advantages

• Metal is highly machinable, allowing for precise cutting, bending, and stamping to create accurate mounting points and features. This versatility ensures seamless compatibility with various installation methods, including wall-mounting, ceiling-suspension, and flush-embedded integration. • Seamlessly unibody-molded, it boasts a premium texture and sophisticated aesthetic, making it ideally suited for commercial display environments.

A metal back cover (most commonly aluminum alloy) perfectly meets the specific requirements of bar-type displays-namely, their long, narrow form factor, high power consumption, and need for exceptional stability-establishing it as the standard configuration for commercial and industrial bar-type screens.