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Related Experiment Video

Updated: May 13, 2026

Fabrication of Flexible Image Sensor Based on Lateral NIPIN Phototransistors

Fabrication of Flexible Image Sensor Based on Lateral NIPIN Phototransistors

Published on: June 23, 2018

Plastic optical touch panels for large-scale flexible display.

Beom-Jun Cheon¹, Jun-Whee Kim, Min-Cheol Oh

¹School of Electrical Engineering, Graduate School of Cogno-mechatronics Engineering, Pusan National University, Pusan (Busan) 609-735, South Korea.

|March 14, 2013

Summary

This summary is machine-generated.

A novel plastic optical touch panel for flexible displays uses waveguide coupling to detect touch. Applying force bends a waveguide, causing a significant output power drop for reliable touch signaling.

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Area of Science:

Optoelectronics
Materials Science
Display Technology

Background:

Flexible displays require robust and transparent touch sensing technologies.
Existing touch panels face limitations in scalability and optical performance for large surfaces.

Purpose of the Study:

To demonstrate a plastic optical touch panel for large-scale flexible displays.
To utilize vertical directional coupling between waveguides for touch detection.

Main Methods:

Fabrication of a touch panel using arrayed channel waveguides and a flexible planar waveguide.
Employing an index-matching liquid to enhance optical transparency.
Measuring output power drop upon application of contact force.

Main Results:

A vertical directional coupling mechanism was successfully implemented.
An output intensity decrease of 17 dB was achieved with a 1.0 N force.
The touch panel demonstrated sufficient sensitivity for contact signal generation.

Conclusions:

The demonstrated plastic optical touch panel is suitable for large-scale flexible display applications.
The waveguide-based touch sensing mechanism offers a viable solution for transparent and scalable touch interfaces.