Touch Input Device Pressure Threshold Control
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Solution Overview
Problem
Input devices with touch sensors often unintentionally execute processing due to slide inputs accompanied by light contact, leading to unintended operations, especially in compact mobile terminals where precise finger movement is challenging.
Innovation Solution
Incorporating a pressure detection unit that only initiates processing when a predetermined pressure standard is met, distinguishing between intentional and unintentional inputs by requiring a specific force threshold for action execution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a touch sensor is used to detect contact by finger or stylus pen, then the input device allows intuitive operation and flexible key arrangement, but light contact during slide input unintentionally triggers processing execution
Solution Approach 1:
The patent changes the parameter of contact detection from simple contact presence to contact strength threshold. The control unit is configured to execute processing only when contact strength exceeds a predetermined threshold, thereby distinguishing between intentional inputs (stronger pressure) and unintentional slide inputs (lighter pressure), resolving the contradiction between ease of operation and reliability
Solution Approach 2:
The patent introduces feedback by continuously monitoring contact strength during touch input and comparing it against a threshold value. This feedback mechanism allows the system to dynamically adjust its response based on the detected contact strength, preventing unintended execution during slide input while maintaining responsiveness for intentional input
2Speed
If the touch sensor detects any contact to execute processing, then the response is immediate and simple, but precise control over when processing should execute becomes difficult
Solution Approach 1:
The patent introduces a contact strength threshold parameter that must be satisfied for processing execution. This additional parameter filter maintains fast response for valid inputs (those exceeding the threshold) while preventing erroneous execution during slide input, thus improving input precision without significantly compromising response speed
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
Prevents unintended processing by ensuring that only deliberate, forceful inputs trigger actions, enhancing user control and reducing errors in touch-based input operations.
Implementation Method 1
a piezoelectric element which generates voltage in response to pressure
Data Source
AI summary
An input device includes a touch sensor, a pressure detection unit configured to detect pressure on the touch sensor, and a control unit that performs control to execute predetermined processing when, in a state such that the touch sensor detects contact inside a predetermined region, data based on pressure detected by the pressure detection unit satisfies a predetermined standard, and performs control not to execute the predetermined processing when, in a state such that the data based on pressure detected by the pressure detection unit satisfies a predetermined standard, the touch sensor detects contact that transitions from outside the predetermined region to inside the predetermined region.