Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Passive Pin Retention
- A mechanical technique used in refreshable Braille display design where pins are held in their raised or lowered positions by a passive mechanical structure rather than by continuously powered actuators. In traditional Braille displays, each pin requires its own actuator to…
- Piezoelectric Actuator(also: Piezo Actuator, Piezoelectric Bimorph)
- A device that converts electrical energy into precise mechanical motion using the piezoelectric effect — the property of certain materials to change shape when an electric voltage is applied. In assistive technology, piezoelectric actuators are the dominant mechanism used in…
- Signal Drift(also: Baseline Drift, DC Drift)
- Signal drift is the gradual, unintended change in the baseline level of a measured signal over time, caused by factors unrelated to the intended measurement. In bio-electrical sensing for assistive technology, drift is a major challenge — for example, in electrooculography…
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