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Related Concept Videos

Design Example: Resistive Touchscreen01:14

Design Example: Resistive Touchscreen

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...

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Free-form Light Actuators &#8212; Fabrication and Control of Actuation in Microscopic Scale
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Flexible microscale tactile display with liquid-to-gas phase-change actuator array.

Sangjun Sim1, Kyubin Bae2, Kyuhyun Hwang1

  • 1School of Mechanical Engineering, Yonsei University, Seoul, Republic of Korea.

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Researchers developed a microscale flexible tactile actuator using water as a phase-change material (PCM). This technology offers high-resolution tactile feedback for immersive virtual reality experiences.

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Area of Science:

  • Materials Science
  • Haptics Technology
  • Micro-actuator Development

Background:

  • Flexible tactile displays are crucial for enhancing user interaction with visual and auditory systems.
  • Existing tactile displays often lack the necessary spatial resolution due to their centimeter-scale limitations.
  • Sophisticated tactile feedback is restricted by the current scale of haptic devices.

Purpose of the Study:

  • To develop a microscale flexible actuator for high-resolution tactile displays.
  • To utilize water as a liquid phase-change material (PCM) for significant volumetric expansion.
  • To create a thin, attachable actuator suitable for curved surfaces and integration with VR systems.

Main Methods:

  • Fabrication of a microscale actuator using a flexible microheater, water as PCM, and a stretchable elastomer membrane.
  • Implementation of a scalable batch process for localized PCM chambers within heater regions.
  • Characterization of actuator performance, including response time, displacement, and power consumption.

Main Results:

  • Developed microscale PCM actuators with a thickness under 200 μm.
  • Achieved a response time of 600 ms and a displacement of 580 μm.
  • Demonstrated low power consumption of 300 mW for actuator operation.

Conclusions:

  • The microscale PCM actuator enables high-resolution tactile feedback, overcoming limitations of previous devices.
  • The thin and flexible nature of the actuator allows for easy integration onto curved surfaces, such as VR headsets.
  • This technology facilitates immersive multisensory experiences by combining tactile feedback with visual and auditory information.