Transparent Cover Shim for Handheld Device Structural Integrity
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Solution Overview
Problem
Modern handheld electronic devices, such as smartphones, face challenges in providing a robust and durable design that maintains structural integrity while allowing for touch and force-sensitive interactions, graphical outputs, and various functional components like cameras and wireless charging systems within a compact form factor.
Innovation Solution
The design incorporates a transparent cover over a display stack with a shim of equal thickness to the circuit board, positioned below the display stack, which provides structural support and reduces deformation, coupled with a force-sensing system and conductive traces on the circuit board for input detection, and a metal frame member for additional structural mounting points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a transparent cover is positioned over the display stack, then the device achieves a compact form factor and protective enclosure, but the structural integrity and stiffness of the display assembly may be compromised
Solution Approach 1:
A shim is introduced as an intermediary component between the display stack and the transparent cover. This shim provides structural support and maintains the spacing relationship, allowing the transparent cover to protect the display while preventing excessive flexing or deformation that would compromise structural integrity.
Solution Approach 2:
The display assembly uses a composite structure combining the transparent cover (providing protection and compact enclosure), the display stack (providing visual output), and the shim (providing structural reinforcement). This composite approach allows each component to fulfill its specific function while collectively achieving both compact form factor and structural integrity.
2Volume of moving object
If the display stack is positioned directly against the transparent cover, then the device achieves maximum compactness, but the display may be susceptible to bending and degradation from impact
Solution Approach 1:
The shim acts as a pre-positioned cushioning element between the display stack and the transparent cover. It provides mechanical support that prevents the display from bending under normal use conditions and absorbs some of the stress from impacts, thereby protecting the display before damage can occur.
Solution Approach 2:
The shim serves as a protective intermediary layer that decouples the display stack from direct contact with the transparent cover. This intermediary structure allows the display to maintain its position in a compact assembly while being protected from the forces transmitted through the cover during impact events.
3Strength
If additional structural support components are added to reinforce the display assembly, then the stiffness and protection are improved, but the device complexity and number of components increase
Solution Approach 1:
Rather than adding structural support throughout the entire device, the shim provides localized reinforcement only in the critical area where the display stack interfaces with the transparent cover. This targeted approach increases stiffness where needed without unnecessarily increasing overall device complexity.
Solution Approach 2:
The shim is a simple intermediary component that provides substantial structural support with minimal complexity. Its straightforward geometry and single-function design allow it to reinforce the display assembly effectively while adding only one additional component to the overall device architecture.
Data Source
AI summary
A mobile phone may include a housing defining at least a portion of a back exterior surface of the mobile phone, a display stack at least partially within the housing, the display stack defining an active region configured to produce a graphical output, and a transparent cover positioned over the display stack. The transparent cover may define a first portion covering the active region of the display stack, a second portion adjacent the first portion, and a hole in the second portion and extending through the transparent cover. The mobile phone may also include a button element positioned in the hole of the transparent cover, a force-sensing system configured to detect an input applied to the button element, a circuit board coupled to the force-sensing system, and a shim positioned below the first portion of the transparent cover and having same thickness that as the circuit board.