Amid the wave of iterative upgrades in electronic devices, products such as smartphones and tablets have deeply integrated into daily life. Their development has placed stricter and more comprehensive requirements on glass, covering structural strength, portability, visual performance, aesthetics, and tactile experience. Cover glass has evolved from a simple protective component into a key functional material that determines product performance and user experience. Through continuous material innovation and process refinement, glass technology has successfully transformed these challenges into opportunities for product innovation. In the following sections, we will explore how glass materials and manufacturing processes meet the diverse demands of modern electronic devices in terms of high strength, thinness, display quality, aesthetic design, and optimized user interaction.
Electronic devices face complex and ever-changing usage environments, where resistance to drops and impacts is the primary mission of cover glass. As a brittle material, glass does not rely solely on thickness for strength improvement, but rather on a core process—chemical strengthening (ion exchange). In this process, shaped glass is immersed in a high-temperature potassium salt solution, where smaller sodium ions on the glass surface are replaced by larger potassium ions. As the glass cools, the potassium ions create a dense compressive stress layer that offsets external tensile stress, significantly enhancing bending and impact resistance. The effectiveness of this process depends on parameters such as surface stress value (CS) and depth of layer (DOL).
| Glass Substrate | CS Value | DOL (Depth of Layer) |
| Standard Soda-lime Glass | 650 | 35 |
| Corning Gorilla Glass | 900 | 45 |
At KS Glass, we provide customized chemical strengthening solutions tailored to specific device structures and strength requirements, ensuring reliability under rigorous testing and actual use conditions.
Alongside strength, portability and compact internal design drive glass development toward extreme thinness. Advanced forming methods such as the down-draw process or overflow fusion method allow substrates to reach thicknesses below 1 mm, with some manufacturers achieving mass production of glass as thin as 0.1 mm. The challenge lies in subsequent cutting, edge grinding, and handling. At KS Glass, we use precision laser cutting and control systems to maintain high yields and edge strength, enabling thinner yet durable designs.
For premium electronic devices, brilliant visual performance is a core competitive edge. The foundation begins with high-transmittance substrates. Aluminosilicate glass—both medium- and high-aluminum grades—offers higher purity and lower iron content than soda-lime glass, resulting in superior light transmission.
| Material | Light Transmittance (T) |
| Soda-lime Glass | 89% – 91% |
| Medium-Alumina Glass (>8% Al₂O₃) | 91% – 91.5% |
| High-Alumina Glass (>12% Al₂O₃) | 91.5% – 92% |
Yet, raw transmittance alone is insufficient. To achieve exceptional clarity, anti-reflective (AR) coatings are applied via PVD (vacuum evaporation or magnetron sputtering) or CVD (dip-coating) methods. These multilayer films reduce reflections through optical interference, raising glass transmittance to over 98%, delivering richer colors and higher contrast.
| Normal Glass | Single Side AR Coating | Single Side AR Coating | Double Sides AR Coating | |
| Color | Clear | Purple Blue | Natural | Natural |
| Optical Curve | / | V | V | W |
| Light Transmittance | ≤90% | ≥93% | ≥94.5% | ≥98% |
| Light Reflectivity | 28.4% | ≤5.2% | ≤4.8% | ≤1% |
Additionally, anti-glare (AG) treatments chemically etch microstructures onto the surface, converting specular reflection into diffuse reflection. This minimizes glare, protecting eyesight in outdoor or high-light environments.
To match sleek industrial designs, hot bending technology is widely used in curved smartphone screens and gaming devices. By heating glass to ~700°C and shaping it with precision molds, complex curves are achieved. Meanwhile, screen printing allows colorful patterns, logos, or sensor masking on the back, while UV printing creates gradient effects. At KS Glass, we ensure precision curvature control, surface quality, and print sharpness without optical distortion.
As the direct interface with users, glass touch surfaces greatly influence daily experience. To prevent smudges, anti-fingerprint (AF) coatings are applied, forming a hydrophobic and oleophobic nanolayer that reduces adhesion of oils and dust by up to 90%. Surfaces stay cleaner, are easier to wipe, and maintain clarity over time.
For durability, scratch resistance is crucial. Beyond the hardness gained from chemical strengthening, additional hard coatings form dense, protective layers on the glass. These coatings distribute pressure from sharp objects, preventing deep scratches and protecting the substrate.
Modern electronic devices demand glass that is stronger, thinner, optically superior, aesthetically versatile, and user-friendly. Through chemical strengthening, ultra-thin processing, high-transmittance substrates, AR/AG optical coatings, hot bending, advanced printing, and functional surface treatments such as AF and hard coatings, glass technology provides a comprehensive solution. Each innovation represents a deeper exploration of material potential and precision craftsmanship, making glass an indispensable enabler of progress in electronic devices.
KS GLASS specializes in the production of high-quality glass products. With advanced technology and expertise, we offer solutions tailored to meet the diverse needs of our customers. Our products are known for their durability, precision, and reliability. We are committed to innovation and excellence in manufacturing, ensuring that every product meets industry standards while catering to specific client requirements.
