Artificial Finger for Touchscreen Testing
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Solution Overview
Problem
Existing methods for testing touchscreens require extensive human involvement, making it impractical to simulate the varied touch angles and mechanical pressures of a human finger, leading to inconsistent and time-consuming evaluations.
Innovation Solution
An artificial finger system configured with a rigid central member and a compressible outer layer, electrically conductive to simulate human touch, is manipulated by a robotic actuator to replicate the mechanical and electrical interactions of a human finger on a touchscreen, allowing for rigorous and repeatable testing without human operators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If human operators perform touchscreen testing manually, then varied touch angles and mechanical pressures can be applied, but the testing process becomes time-consuming and inconsistent
Solution Approach 1:
The patent creates an artificial finger that copies the essential characteristics of a human finger (shape, conductivity, compressibility) to perform touchscreen testing. This artificial replica enables automated robots to simulate human touch patterns consistently without the time consumption and variability of manual human testing, directly resolving the contradiction between testing consistency and time efficiency
Solution Approach 2:
The patent replaces the human operator's mechanical interaction with an automated robotic system that uses an artificial finger. This substitution eliminates human variability in applying touch forces while maintaining the mechanical interaction needed for realistic touchscreen testing, achieving both consistency and time efficiency
2Measurement precision
If an artificial finger is designed to closely approximate human finger form and function, then touchscreen testing accuracy improves, but device complexity increases
Solution Approach 1:
The artificial finger applies local quality by making the distal pad conductive while keeping other portions non-conductive or less conductive, mimicking the electrical properties of a real human finger. This localized conductivity enhancement achieves accurate touchscreen interaction without requiring the entire artificial finger structure to be complex or fully conductive
Solution Approach 2:
The artificial finger uses composite construction combining rigid support structures with compliant outer layers and selective conductive elements. This composite approach achieves realistic mechanical and electrical properties for accurate touch simulation while managing overall device complexity through functional material differentiation
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 solution enables precise and consistent simulation of human touch on touchscreens, reducing the need for human testing and improving the reliability of touchscreen evaluations by accurately replicating the mechanical and electrical responses to various touch inputs.
Implementation Method 1
A compressible outer layer is disposed around at least a portion of the rigid central member and is shaped to approximate a form of the extended human finger, and includes a conductive element spanning at least a distal pad and a tip of the artificial finger
Implementation Method 2
A compressible outer layer is disposed around at least a portion of the rigid central member and is shaped to approximate a form of the extended human finger
Implementation Method 3
A compressible outer layer is disposed around at least a portion of the rigid central member and is shaped to approximate a form of the extended human finger
Data Source
AI summary
This document describes systems and techniques for simulating the touch of a human finger in manipulating an interface device, such as a touchscreen included in a mobile phone or other computing device. The systems and techniques include an artificial finger configured to be received and manipulated by a robotic actuator to simulate surface engagement, mechanical force, and electrical conductivity of a human finger engaging the touchscreen at varied touch angles and/or mechanical pressures. The systems and techniques thereby provide for rigorous and repeatable testing of an electrical and mechanical response of the touchscreen to simulated user inputs without involving a human test operator.