Laminated Display Protector for Safer Glass Fracture Control
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Solution Overview
Problem
Existing display devices in vehicles and trains are not adequately designed to minimize injury to riders, as they do not sufficiently consider the lethality of glass laminates used, which can be expensive and have limited polymer materials, and do not meet safety standards like ECE-R21 for non-lethality.
Innovation Solution
A display device with a protector comprising a thin first glass substrate (0.5 mm or less) and a second glass substrate, bonded by a first adhesive layer with a pummel value of 7 to 10, reducing the size of scattering material upon impact and minimizing lethality by controlling the fracturing pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemically strengthened glass is used to improve fracture characteristics, then durability and fracture characteristics are improved, but cost increases and material selection is limited
Solution Approach 1:
The patent changes the thickness parameter of the glass substrate from conventional thicker sizes to 0.5mm or less, and controls the pummel value of the adhesive layer within 7-10. This parameter optimization achieves adequate fracture characteristics without requiring expensive chemically strengthened glass, thereby resolving the contradiction between reliability and manufacturing cost.
Solution Approach 2:
The patent creates a composite structure combining a thin glass substrate (0.5mm or less) with a polymer adhesive layer having controlled pummel value (7-10). This composite design allows the glass to be thinner and less expensive while the adhesive layer compensates for fracture characteristics, avoiding the need for costly chemically strengthened glass.
2Reliability
If glass laminate is used to improve durability, then durability is improved, but lethality to riders is not sufficiently reduced
Solution Approach 1:
The patent optimizes the thickness of the glass substrate to 0.5mm or less and controls the pummel value of the adhesive layer within 7-10. These parameter changes ensure that when the glass fractures, the fragments are small and dispersed, maintaining durability while significantly reducing the lethality of scattered pieces to riders.
Solution Approach 2:
The patent applies different properties to different layers: the glass substrate is made thin (0.5mm or less) to reduce fragment lethality, while the adhesive layer is designed with specific pummel value (7-10) to control fracture behavior. This local differentiation allows the system to achieve both durability and reduced lethality simultaneously.
3Strength
If thicker glass substrate is used to improve strength, then strength is improved, but size of scattering material upon impact increases
Solution Approach 1:
The patent sets the glass substrate thickness to 0.5mm or less, which is thinner than conventional glass. This parameter change reduces the size of scattering material upon impact. The strength requirement is compensated by optimizing the adhesive layer's pummel value to 7-10, which holds the thin glass together effectively during normal use while allowing controlled fracture patterns.
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
The display device reduces the size of scattering material and lethality to riders by controlling the fracturing of the glass substrate, adhering to safety standards and minimizing the size of fragments, thus enhancing rider safety.
Implementation Method 1
a first adhesive layer that adheres the first glass substrate and the second glass substrate to each other
Data Source
AI summary
A display device includes a display panel, and a protector provided on a display surface of the display panel. The protector includes a first glass substrate positioned on a user side, a second glass substrate positioned between the first glass substrate and display surface, and a first adhesive layer that adheres the first glass substrate and the second glass substrate to each other. A thickness of the first glass substrate is 0.5 mm or less, and a pummel value of the first adhesive layer is from 7 to 10.