By replacing the phosphor screen in a laser phosphor display (LPD) with a luminescent solar concentrator (LSC), one can harvest energy from ambient light as well as display high-resolution images. "Energy-harvesting laser phosphor display and its design considerations," published recently by SPIE, the international society for optics and photonics, in the Journal of Photonics for Energy, describes the development, processes, and applications of an LPD.
In a proof-of-concept experiment, lead author Ichiro Fujieda and his collegeagues at Ritsumeikan University fabricated a 95 × 95 × 10 mm screen by sandwiching a thin layer of coumarin 6 with two transparent plates. These plates guided the photoluminescent (PL) photons emitted in both directions toward their edge surfaces. After removing the light source in a DMD-based commercial grade projector and feeding a blue laser beam into its optics, the screen generated green images.
By replacing the phosphor screen in a laser phosphor display (LPD) with a luminescent solar concentrator (LSC), one can harvest energy from ambient light as well as display high-resolution images. "Energy-harvesting laser phosphor display and its design considerations," published recently by SPIE, the international society for optics and photonics, in the Journal of Photonics for Energy, describes the development, processes, and applications of an LPD.
In a proof-of-concept experiment, lead author Ichiro Fujieda and his collegeagues at Ritsumeikan University fabricated a 95 × 95 × 10 mm screen by sandwiching a thin layer of coumarin 6 with two transparent plates. These plates guided the photoluminescent (PL) photons emitted in both directions toward their edge surfaces. After removing the light source in a DMD-based commercial grade projector and feeding a blue laser beam into its optics, the screen generated green images.
Attaching a photodiode with a 10 × 10 mm sensitive area on the bottom edge of the screen to record the power of the PL photons indicated that a fully covered version would harvest up to 71% of the incoming optical power. However, a ghost image was noticeable when displaying a high-contrast still image.
Continue reading at: International Society for Optics and Photonics
Image: This is a photograph of a resolution test chart displayed on the phosphor screen. doi:10.1117/1.JPE.7.028001 (Credit: Shunsuke Itaya, Masamichi Ohta, Yuuki Hirai, and Takamasa Kohmoto)
