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Related Concept Videos

Design Example: Resistive Touchscreen01:14

Design Example: Resistive Touchscreen

495
A device engineer plays a crucial role in designing user interfaces for mobile devices. One such interface is the resistive touchscreen, which fundamentally consists of two metallic layers: a flexible upper layer and a rigid lower layer, separated by a narrow gap. The high resistance between these two layers is a key characteristic of this design.
When a user touches the screen, the two layers make contact at a specific point known as the touchpoint. This contact reduces the resistance between...
495
Design Example01:23

Design Example

408
The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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Schemas01:42

Schemas

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A schema is a mental construct consisting of a cluster or collection of related concepts (Bartlett, 1932). There are many different types of schemata, and they all have one thing in common: schemata are a method of organizing information that allows the brain to work more efficiently. When a schema is activated, the brain makes immediate assumptions about the person or object being observed.
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Related Experiment Video

Updated: Oct 22, 2025

An Assessment Method and Toolkit to Evaluate Keyboard Design on Smartphones
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Using touchscreen mobile devices-when, where and how: a one-week field study.

Abdullah M Alzhrani1, Kelly R Johnstone1, Elisabeth A H Winkler2

  • 1The University of Queensland, School of Earth and Environmental Sciences, Brisbane, Australia.

Ergonomics
|August 26, 2021
PubMed
Summary
This summary is machine-generated.

Adults spend over two hours daily on touchscreen mobile devices (TSMDs), primarily at home while sitting or lying down. Younger adults under 30 use TSMDs significantly more, highlighting potential health implications.

Keywords:
Touchscreen mobile deviceactivitymusculoskeletal disordersposturesitting workplace

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Area of Science:

  • Human-Computer Interaction
  • Ergonomics
  • Digital Health

Background:

  • Touchscreen mobile device (TSMD) use is prevalent, yet objective data on usage patterns in free-living conditions are limited.
  • Understanding TSMD use, including posture and location, is crucial for assessing potential health impacts.

Purpose of the Study:

  • To objectively measure TSMD use, including duration, frequency, posture, and location, in a free-living environment.
  • To identify differences in TSMD usage patterns based on age and location.

Main Methods:

  • A cross-sectional study involving 54 adults over seven consecutive days.
  • Objective data collection on TSMD use, body posture (lying, sitting, standing, stepping), and location (workplace, home, other).

Main Results:

  • Average TSMD use was 152 minutes/day, with 51 engagements/day. Participants under 30 averaged 230 minutes/day.
  • TSMD use predominantly occurred at home (54%) and work (24%).
  • Sitting (77 min/day) was the most common posture, followed by lying down (39 min/day), particularly at home.

Conclusions:

  • Objective data reveal significant TSMD usage patterns in adults, with notable differences in younger demographics.
  • Home-based TSMD use, especially in lying postures, warrants further investigation for health and wellbeing implications.
  • These findings provide a foundation for future research into the ergonomic and health consequences of TSMD use.