Touch Display Scroll Control Velocity Threshold

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Solution Overview

Problem

Touch displays face challenges in accurately interpreting user input when selectable items are scrolling, particularly in determining whether to stop or select items based on velocity, leading to potential accidental selections due to fast-moving items.

Innovation Solution

Implementing a scroll control mechanism that recognizes touch input on a touch display and determines if the selectable item is scrolling above or below a threshold velocity, stopping the scrolling if above and selecting if below, to prevent accidental selections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If touch input is recognized during scrolling without velocity threshold check, then user interaction speed is improved, but accidental selections increase

Engineering Contradiction:

Improveuser interaction speedVSAvoidselection accuracy

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system changes the parameter of velocity threshold to differentiate between intentional and unintentional touches. By monitoring the velocity of scrolling items and comparing it against a predefined threshold, the system can determine whether a touch during scrolling is intentional (low velocity) or accidental (high velocity), thereby resolving the contradiction between interaction speed and selection accuracy.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If velocity threshold checking is implemented, then selection accuracy is improved, but system complexity increases

Engineering Contradiction:

Improveselection accuracyVSAvoidcontrol mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces complex mechanical or manual control mechanisms with an automated velocity-based detection system. By using software-based velocity calculation and threshold comparison, the system achieves accurate selection without requiring additional physical controls or complex user gestures, thus improving reliability while minimizing the increase in system complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If scrolling velocity is not monitored, then ease of operation is improved, but accidental selections increase

Engineering Contradiction:

Improveoperation simplicityVSAvoidselection accuracy

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The system performs self-service by automatically monitoring scrolling velocity and making selection decisions based on the detected velocity threshold. This eliminates the need for additional user actions or complex control mechanisms, maintaining ease of operation while improving selection accuracy through automated velocity-based differentiation between intentional and accidental touches.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS8775971B2Touch display scroll control

Publication Date: 2014.07.08 MICROSOFT TECHNOLOGY LICENSING LLC

AI summary

A scroll control recognizes a touch input directed to a selectable item while the selectable item is scrolling on a touch display. The scroll control determines if the selectable item is scrolling above a threshold velocity when the touch input directed to the selectable item is recognized. If the selectable item is determined to be scrolling above the threshold velocity, scrolling of the selectable item is stopped. If the selectable item is determined to be scrolling below the threshold velocity, the selectable item is selected.