Close

Search

Search Menu
Photonics Media Photonics Marketplace Photonics Spectra BioPhotonics EuroPhotonics Vision Spectra Photonics Showcase Photonics ProdSpec Photonics Handbook

Light Projection System Changes Objects’ Color and Patterns

Facebook Twitter LinkedIn Email Comments
CAMBRIDGE, Mass., May 18, 2021 — Researchers at MIT have developed a method to rapidly change imagery on an object’s surface. The system, “ChromoUpdate,” pairs an ultraviolet light projector with items coated in light-activated dye. The projected light alters the reflective properties of the dye to create colorful new images in a matter of minutes. The technology may accelerate product development by allowing developers to showcase multiple color schemes and designs with a single prototype.

The new system builds on a previous programmable matter system developed by the researchers called “PhotoChromeleon.” That system was the first to show the researchers that it could have high-resolution, multicolor textures they could program over and over again, said lead author and postdoctoral researcher Michael Wessely.
A new system uses UV light projected onto objects coated with light-activated dye, such as this previously pink phone case, to alter the reflective properties of the dye, creating images in minutes. Courtesy of Michael Wessley, Stefanie Mueller, et al.
A new system uses UV light projected onto objects coated with light-activated dye, such as this previously pink phone case, to alter the reflective properties of the dye, creating images in minutes. Courtesy of Michael Wessely, Stefanie Mueller, et al.

That system used a lacquer-like ink composed of cyan, magenta, and yellow dyes. An object coated with this ink could then be reprogrammed using light. First, UV light from an LED was shone on the ink to fully saturate the dyes. Next, the dyes were selectively desaturated with a visible-light projector to bring each pixel to its desired color and leave the final image behind.

Tests demonstrated that it took about 20 min for the system to update an image.

ChromoUpdate takes advantage of fast programming cycles — things that would not have been possible before, Wessely said. Rather than an LED, which uniformly blasts the entire surface, ChromoUpdate uses a UV projector that can vary light levels across the surface. This grants the operator pixel-level control over saturation levels.

“We can saturate the material locally in the exact pattern we want,” Wessely said.

The selective saturation procedure allowed designers to create a black-and-white preview of a design in seconds or a full-color prototype in minutes, which therefore enables multiple designs to be tested in a single work session.

“You can actually have a physical prototype to see if your design really works,” Wessely said. “You can see how it looks when sunlight shines on it or when shadows are cast. It’s not enough just to do this on a computer.”

The team hopes to improve the technology and broaden its potential. Currently, the ink is specialized for smooth rigid surfaces such as mugs, phone cases, and cars. The researchers aim to work with flexible, programmable textiles. The researchers have partnered with a group of textile makers in Paris to see how ChromoUpdate could be incorporated into the design process.

The research will be presented at the ACM Conference on Human Factors in Computing Systems.

Photonics.com
May 2021
GLOSSARY
color
The attribute of visual experience that can be described as having quantitatively specifiable dimensions of hue, saturation, and brightness or lightness. The visual experience, not including aspects of extent (e.g., size, shape, texture, etc.) and duration (e.g., movement, flicker, etc.).
pattern
A device that determines the lens shape in the cutting or edging phase of fabrication. It also is used to denote the arrangement of markings on a reticle.
coatingsinkMITUVUV lightprogrammablereprogramcolorpatterndesignMassachusetts Institute of TechnologyChromoUpdatePhotoChromeleonlight-activated

Comments
back to top
Facebook Twitter Instagram LinkedIn YouTube RSS
©2021 Photonics Media, 100 West St., Pittsfield, MA, 01201 USA, [email protected]

Photonics Media, Laurin Publishing
x We deliver – right to your inbox. Subscribe FREE to our newsletters.
We use cookies to improve user experience and analyze our website traffic as stated in our Privacy Policy. By using this website, you agree to the use of cookies unless you have disabled them.