Side-Key Capacitance Sensing to Prevent Smartphone Misoperation
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Solution Overview
Problem
Smartphone keys often misoperate due to accidental external mechanical collisions, leading to reduced user experience as they can execute unintended functions when bumped, such as adjusting volume or pausing music.
Innovation Solution
A terminal control system comprising a detection chip connected to terminal keys that generate inductive and interelectrode capacitance in response to control instructions, allowing the chip to differentiate between user and mechanical inputs by detecting capacitance variations, thereby preventing misoperations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the terminal key is made sensitive to external control instructions, then the ease of operation is improved, but the reliability deteriorates due to misoperations from mechanical collisions
Solution Approach 1:
The patent changes the detection parameters from simple touch detection to dual-parameter detection (inductive capacitance and interelectrode capacitance). By monitoring both capacitance types simultaneously, the system can distinguish between intentional user operations and accidental mechanical collisions, thus maintaining ease of operation while improving reliability through parameter-based differentiation
Solution Approach 2:
The system implements feedback by continuously monitoring capacitance variations and using this information to determine whether to execute the control instruction. The detection chip provides feedback about the nature of the touch (intentional vs. accidental) to the control system, enabling intelligent decision-making that preserves reliability while maintaining operational responsiveness
2Productivity
If the terminal key responds to all external control instructions, then the productivity is improved, but the object-affected harmful factors increase due to mechanical touch misoperations
Solution Approach 1:
The patent converts the harmful mechanical collision into a detectable signal pattern that can be distinguished from intentional operations. By using capacitance sensing, the system transforms the accidental mechanical touch (harmful factor) into detectable capacitance variation data, which then allows the system to identify and reject false operations while still responding to valid user inputs, thus maintaining productivity while eliminating harmful misoperations
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 system effectively prevents misoperations caused by mechanical touches, enhancing user experience by accurately determining the type of control instruction and only executing intended operations.
Implementation Method 1
each of the at least one terminal key is configured to generate an inductive capacitance and an interelectrode capacitance corresponding to an external control instruction
Implementation Method 2
the buffer layer is configured to form an interelectrode gap between the capacitive sensing layer and the substrate; and form a deformation in response to a reception of the control instruction by the capacitive sensing layer
Data Source
AI summary
A terminal control system and method, and a terminal device are provided. The terminal control system includes: a detection chip and at least one terminal key arranged on a side surface of a terminal device. The detection chip is connected to the terminal key. The terminal key is configured to generate an inductive capacitance and an interelectrode capacitance corresponding to an external control instruction, in response to a reception of the external control instruction. The detection chip is configured to detect the inductive capacitance and the interelectrode capacitance; determine inductive capacitance variation corresponding to the inductive capacitance and interelectrode capacitance variation corresponding to the interelectrode capacitance; determine a control type corresponding to the control instruction according to the inductive capacitance variation and the interelectrode capacitance variation; and trigger the terminal device to perform a control operation corresponding to the control type.