Touch Input Device Mid-Frame Structural Integrity
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Solution Overview
Problem
Touch input devices face challenges in maintaining constant pressure sensing sensitivity under external forces and preventing deformation and movement of the mid-frame within the housing.
Innovation Solution
The touch input device includes a mid-frame with a guide member and a coupling member that securely attaches to the housing, using grooves and protrusions or adhesive agents to maintain structural integrity and prevent movement, while a pressure sensor detects touch pressure by measuring capacitance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the mid-frame is made thinner to reduce device thickness, then the device becomes more compact and aesthetically pleasing, but the mid-frame becomes more susceptible to deformation and movement under external forces
Solution Approach 1:
The mid-frame is divided into multiple sections with reinforcement ribs strategically positioned to provide structural support without increasing overall thickness. This segmentation allows the thin frame to maintain strength through distributed reinforcement rather than uniform thickening.
Solution Approach 2:
The mid-frame employs composite construction combining materials with different properties - a thin outer shell for aesthetics and compactness, with integrated reinforcement ribs made of higher-strength material or cross-sectional geometry to provide structural rigidity and resistance to deformation.
2Ease of manufacture
If the mid-frame is loosely fitted to accommodate manufacturing tolerances, then assembly becomes easier and cost is reduced, but the mid-frame moves within the housing under external forces
Solution Approach 1:
A damping member is introduced as an intermediary element between the mid-frame and housing. This damping member absorbs positional variations and external forces, maintaining stable electrical connection between the pressure sensor and mid-frame while accommodating manufacturing tolerances in the mid-frame's position within the housing.
Solution Approach 2:
The electrical connection structure is designed with flexible parameters - the damping member's mechanical properties (viscoelasticity, damping coefficient) are optimized to allow positional variation while maintaining stable electrical contact, transforming the rigid position-stability requirement into a controlled parameter range.
3Strength
If reinforcement ribs are added to the mid-frame to prevent deformation, then structural strength is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The mid-frame is divided into multiple sections with reinforcement ribs strategically positioned only where structurally necessary. This segmentation provides strength enhancement at critical locations without adding complexity to the entire frame structure, allowing for simplified manufacturing processes.
Solution Approach 2:
Reinforcement is applied locally at specific high-stress areas of the mid-frame rather than uniformly throughout. The reinforcement ribs are positioned to address specific deformation risks while maintaining simplicity in low-stress areas, optimizing the balance between strength and manufacturing complexity.
4Reliability
If a rigid connection structure is used between the pressure sensor and mid-frame, then electrical connection stability is improved, but the pressure sensor cannot adapt to position variations caused by external forces
Solution Approach 1:
A damping member serves as an intermediary between the pressure sensor and mid-frame, providing mechanical compliance that absorbs position variations from external forces while maintaining stable electrical connection. This intermediary element decouples the rigid electrical connection requirement from the flexible position adaptation need.
Solution Approach 2:
The connection structure utilizes materials or mechanisms with variable mechanical parameters - the damping member's viscoelastic properties allow it to maintain stable electrical contact under normal conditions while adapting to position changes when external forces are applied, transforming the connection from rigid to adaptively compliant.
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 configuration ensures constant pressure sensing sensitivity and reduces deformation and movement of the mid-frame, enhancing the device's durability and accuracy under external forces.
Implementation Method 1
a pressure sensor that is disposed on the mid-frame and senses a pressure applied to the cover in association with a distance change between the cover and the mid-frame
Data Source
AI summary
A touch input device may be provided which includes at least one cover and a display module disposed under the cover, and detects a pressure of a touch input to the cover. The touch input device includes: a housing which includes a bottom plate on which a battery and a mainboard are disposed; and a mid-frame which is disposed within the housing, is disposed under the display module, and is disposed on the battery and on the mainboard. The mid-frame includes a guide member which is disposed on a bottom surface of the mid-frame and is coupled to the bottom plate of the housing.