UCSB researchers develop a light-powered tactile display where digital graphics can be seen and physically felt.
A research team at UC Santa Barbara has created a new display technology that merges sight and touch, letting users feel digital graphics as physical bumps under their fingertips.The system uses tiny pixels that expand outward when exposed to projected light.
The work signals a potential shift in how people interact with screens, from mobile devices to car dashboards and even smart building surfaces.Simple question sparks the ideaThe project began when Professor Yon Visell posed a challenge to PhD candidate Max Linnander shortly after he arrived at UCSB in 2021.“The question was simple enough: Could the light that forms an image be converted into something that can be felt?” Linnander said.Even the research team was unsure whether the idea could work. “We didn’t know if it was feasible,” Visell said.“The possibility that it might be impossible and the very idea of enabling people to ‘feel light’ made the question irresistible.”Months of theoretical work and simulation testing followed. Progress stayed slow until December 2022, when Linnander built a prototype consisting of just one pixel activated by a diode laser.Visell still remembers the breakthrough.“I put my finger on the pixel and felt a clear tactile pulse whenever the light flashed,” he said. He added that it was the moment they knew the core idea worked.Light-driven systemThe technology relies on thin display surfaces patterned with millimeter-scale optotactile pixels. Each pixel contains an air cavity and a suspended thin graphite film.When light hits the film, it heats rapidly. The air beneath expands and pushes the surface upward by as much as one millimeter, creating a noticeable bump.A low-power scanning laser provides both illumination and power. It moves across the display at high speed, activating each pixel for just a fraction of a second.There are no wires or embedded electronics in the screen. The refresh rate is fast enough to make animations look and feel continuous in real time.The team has already built panels with more than 1,500 independently controlled pixels, and they say much larger versions are possible using modern projection systems.Potential uses beyond researchUser studies showed participants could locate pixels, detect motion, and tell apart spatial patterns using touch with millimeter-level accuracy. The researchers say these results point to broad tactile content possibilities.The concept has roots in 19th-century experiments by Alexander Graham Bell, who used modulated sunlight to produce sound vibrations in air-filled tubes.Now the same physics supports a modern digital interface.Future applications could include tactile car controls, e-books with physical illustrations, or interactive architectural surfaces.For the researchers, the underlying idea is straightforward: anything visible on a screen might one day be something you can feel.The study is published in the journal Science Robotics.
Interface Design Optotactile Display Science Robotics Tactile Technology Touchscreen Innovation UCSB
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