Force Touch Assembly With Interleaved Conductive Layers
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Solution Overview
Problem
Existing force touch assemblies face challenges with complex mechanism design and precise alignment requirements, affecting the accuracy and stability of pressure sensing, particularly in achieving accurate two-dimensional coordinate detection and pressure measurement.
Innovation Solution
A force touch assembly design featuring a stacked configuration of substrates, patterned conductive layers, insulation layers, and variable pressure-sensitive materials, incorporating capacitive sensing electrodes for two-dimensional coordinate detection and pressure sensing electrodes for depth pressure sensing, which are interleaved to improve alignment tolerance and sensing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a cantilever mechanism combined with strain gauges is used for pressure sensing, then pressure sensing capability is achieved, but the complexity of the mechanism design is increased
Solution Approach 1:
The patent replaces the mechanical cantilever mechanism with a capacitive sensing system using patterned conductive layers. The first and second patterned conductive layers form capacitive sensing electrodes that detect pressure through capacitance changes, eliminating the need for complex mechanical cantilever structures while maintaining pressure sensing capability
Solution Approach 2:
The patent uses composite material structures with multiple patterned conductive layers (first patterned conductive layer, second patterned conductive layer) stacked with insulation layers. This composite structure enables both pressure sensing and coordinate detection functions while simplifying the overall mechanism design
2Measurement precision
If a pressure sensing film is used between display and backlight module, then pressure sensing is achieved through capacitance changes, but the requirements for assembly alignment are higher
Solution Approach 1:
The patent introduces a vertical stacking dimension with multiple patterned conductive layers (first patterned conductive layer, second patterned conductive layer, third patterned conductive layer) separated by insulation layers. This multi-layer vertical structure provides inherent alignment tolerance and reduces the stringency of assembly alignment requirements compared to single-film solutions
Solution Approach 2:
The patent segments the pressure sensing function into multiple independent patterned conductive layers with distinct functions. The first and second patterned conductive layers form capacitive sensing electrodes for coordinate detection, while the third patterned conductive layer provides additional sensing capability, allowing each layer to be optimized independently
3Measurement precision
If alignment is not accurate in force touch assembly, then the accuracy of each sensing position during pressure sensing is affected, but achieving accurate alignment increases manufacturing complexity
Solution Approach 1:
The patent uses vertical stacking of multiple patterned conductive layers to create a three-dimensional sensing structure. This vertical dimension provides inherent alignment tolerance, as the stacked layers can maintain functional alignment even with slight horizontal misalignments during assembly, reducing the impact of alignment errors on sensing accuracy
Solution Approach 2:
The patterned conductive layers serve multiple functions simultaneously: they act as both capacitive sensing electrodes for coordinate detection and pressure sensing elements. This multi-functionality reduces the need for separate alignment-critical components, thereby improving sensing accuracy without proportionally increasing manufacturing complexity
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 design enhances the accuracy and stability of pressure sensing by avoiding assembly misalignment issues and enabling both two-dimensional coordinate detection and three-dimensional spatial information acquisition, providing diversified applications with improved performance.
Implementation Method 1
a plurality of variable pressure sensitive materials are stacked between the first substrate and the second substrate
Implementation Method 2
The first patterned conductive layer includes a plurality of capacitive sensing electrodes
Data Source
AI summary
An electronic device and its force touch assembly are provided. The force touch assembly includes a first substrate, a second substrate, a first patterned conductive layer, an insulation layer, a second patterned conductive layer, a plurality of variable pressure sensitive materials and a third patterned conductive layer, wherein the first patterned conductive layer, the insulation layer, the second patterned conductive layer, the plurality of variable pressure sensitive materials and the third patterned conductive layer are sequentially stacked from top to bottom between the first substrate and the second substrate.