Laser-Welded Display Edges for Impact Durability
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Solution Overview
Problem
Electronic devices with displays, particularly those using transparent substrates like glass, face challenges in durability as they are prone to damage from impacts, leading to potential separation of display layers and rendering the display unusable, with existing protective structures being bulky and unattractive.
Innovation Solution
The use of laser welding to join display layers, such as glass substrates, around the periphery of the display to enhance durability and prevent damage from stress, employing a ring of sealant and laser-welded edges to strengthen the bond between layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thick plastic housings are used to protect fragile display structures, then protection against impact damage is improved, but the device becomes bulky and unattractive
Solution Approach 1:
The protective structure is segmented into multiple functional layers: a thin housing providing aesthetic profile, a separate compliant buffer layer for impact absorption, and a rigid reinforcement layer for structural support. This segmentation allows each layer to perform its specialized function without compromising the overall device profile.
Solution Approach 2:
The protective structure uses composite materials combining a compliant buffer material (such as silicone rubber or thermoplastic elastomer) with a rigid reinforcement material (such as glass fiber reinforced plastic or metal). This composite construction provides both impact absorption and structural strength while maintaining a thin overall profile.
2Shape
If display layers are made from rigid transparent materials like glass, then display quality and aesthetics are improved, but susceptibility to impact damage increases
Solution Approach 1:
A compliant buffer layer is positioned between the rigid glass display layers to provide beforehand cushioning. This buffer layer absorbs impact energy before it can reach and damage the fragile glass substrates, preventing crack propagation and layer separation during drop events.
Solution Approach 2:
The patent modifies the mechanical parameters of the display assembly by introducing materials with different elastic moduli and damping characteristics. The compliant buffer layer has high elasticity and damping capacity, while the glass layers maintain their optical properties, creating a multi-parameter optimized structure that balances transparency and impact resistance.
3Ease of manufacture
If display layers are joined with adhesive alone, then manufacturing simplicity is maintained, but bond strength is insufficient under stress
Solution Approach 1:
The joining method merges adhesive bonding with laser welding to create a hybrid joint. The adhesive provides initial bond strength and alignment, while the laser-welded glass frit material creates permanent fusion bonds at the periphery, resulting in a composite joint that combines the advantages of both methods.
Solution Approach 2:
The joint structure uses composite materials including organic adhesive material and inorganic glass frit material. The glass frit material, when laser-welded, forms a composite bond that combines the flexibility and gap-filling properties of adhesive with the high-strength fusion bonding of welded glass.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method effectively strengthens the display by preventing delamination and damage from impacts, while maintaining a sleek and attractive design by ensuring the display layers remain securely attached.
Implementation Method 1
The substrate layers may be welded together with a glass weld such as a laser glass weld or other weld formed on an edge surface of the substrate layers running along the periphery
Data Source
AI summary
An electronic device may be provided with a display having substrate layers such as a color filter layer, thin-film transistor layer, or other display layers. An array of pixels may be formed from thin-film circuitry on a display layer. A color filter layer may be formed from an array of color filter elements on a display layer. The color filter elements may provide the array of pixels with the ability to display color images. In a liquid crystal display configuration, a liquid crystal layer may be interposed between the substrate layers. A ring of sealant may surround the liquid crystal layer and may be interposed between the substrate layers. The display may have a periphery. The substrate layers may be welded with a glass weld such as a laser glass weld or other weld on an edge surface of the substrate layers running along the periphery.