Cover Window Drop Testing With a Stiffness-Matched Mock-Up
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Solution Overview
Problem
Existing methods for testing the durability of display device cover windows require actual product assembly, leading to potential damage and increased costs due to breakage during testing.
Innovation Solution
A method and apparatus utilizing a mock-up portion that simulates an actual product, allowing a three-point bending test to determine the cover window's stiffness and simulate drop experiments, using a mock-up portion with a detachable body and adhesive member to attach the cover window, and a linear motion system for controlled drops onto a surface member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a cover window is attached to an actual product for breakage testing, then the test accuracy is improved, but the risk of damaging the actual product increases and testing costs increase
Solution Approach 1:
The patent creates a mock-up portion that replicates the structural characteristics of the actual electronic device, including its stiffness range (130-350 N/mm). This copy allows breakage testing to be performed on the mock-up instead of the actual product, maintaining test accuracy while eliminating the risk of damaging the real device.
Solution Approach 2:
The mock-up portion is designed as a disposable or reusable test fixture that can be repeatedly used for multiple breakage tests. Instead of risking damage to expensive actual products, the mock-up serves as a cost-effective substitute that can be discarded or reset after testing, significantly reducing testing costs and product damage risk.
2Object-affected harmful factors
If a mock-up portion is fabricated to simulate actual product, then the risk of damaging actual product is reduced, but the manufacturing complexity increases
Solution Approach 1:
The mock-up portion is divided into separate functional components: a mock-up body portion (case) and a load portion. These segments can be independently manufactured and assembled, simplifying the overall manufacturing process while maintaining the required structural complexity for accurate stiffness simulation.
Solution Approach 2:
The mock-up portion is designed to serve multiple functions: it provides the structural framework, contains the load portions for stiffness adjustment, and supports the cover window for testing. This multi-functionality reduces the need for additional separate components, thereby managing complexity while achieving accurate test simulation.
3Reliability
If the stiffness of mock-up portion is adjusted to match actual product, then the test reliability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The stiffness of the mock-up portion is controlled by adjusting parameters of the load portion, such as its position, mass, and distribution within the case. By changing these parameters, the overall stiffness can be tuned to fall within the target range (130-350 N/mm), achieving reliable test conditions without requiring extremely tight manufacturing tolerances on all components.
Solution Approach 2:
Instead of requiring uniform high precision throughout the entire mock-up structure, the patent focuses precision requirements on specific critical areas. The load portion's positioning and mass distribution are controlled with higher precision to achieve the target stiffness range, while other non-critical parts of the mock-up body can be manufactured with standard tolerances, thereby balancing reliability with manufacturability.
Data Source
AI summary
An apparatus for manufacturing a display device includes a stage, a surface member disposed on the stage, a linear motion portion that is spaced apart from the stage and that linearly moves, a mock-up portion disposed on the linear motion portion and that falls to the surface member, and a cover window coupled to the mock-up portion and that includes one surface exposed outside the mock-up portion.