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LED 어레이 기반 광열형 형상 가변 촉각 디스플레이의 광학적 간섭 분석
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- Issue Date
- 2025-11
- Citation
- 제어.로봇.시스템학회 논문지, v.31, no.11, pp.1347-1352
- ISSN
- 1976-5622
- Publisher
- 제어·로봇·시스템학회
- Language
- Korean
- Type
- Journal Article
- Abstract
- A photothermal morphable tactile display using an LED array features a functional bilayer film placed above a pneumatic chamber. Near-infrared (NIR) light emitted from an LED array under the chamber induces localized softening of the film, enabling shape deformation through pneumatic pressure. The inherent radiation profile of LEDs causes light to diffuse beyond the target area, resulting in optical crosstalk. This paper presents a model to quantitatively estimate this crosstalk, considering the LED radiation profile and treating the aperture radius and pitch of the pneumatic chamber as key design parameters. A 10×10 NIR-LED array was fabricated to verify the model’s accuracy, and temperature distribution was measured using an infrared thermal camera. The model predicted crosstalk power ratios of 6.7% and 2.7% for adjacent and diagonal nodes, respectively. Experimental measurements yielded corresponding values of 6.5% ± 0.5% and 2.1% ± 0.3%, confirming the predictive model’s accuracy.
- KSP Keywords
- Bilayer film, Experimental measurement, Infrared thermal, Key design, LED Array, LED radiation, Near-infrared, Pneumatic pressure, Predictive model, Target area, Temperature distribution