4 April 2017 Energy-harvesting laser phosphor display and its design considerations
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Abstract
One can convert a luminescent solar concentrator to a display by projecting intensity-modulated light on it. We fabricated a 95    mm × 95    mm × 10    mm screen by sandwiching a thin coumarin 6 layer with two acrylic plates. We removed the light source in a commercial projector and fed a blue laser beam into its optics. It displayed monochrome images on the screen clearly. A photodiode covered a 10    mm × 10    mm region on the edge surface of the screen. As we pulsed the laser, the photodiode output varied synchronously. Its output indicates that a fully covered version would harvest up to 71% of the incoming laser power. However, a ghost image was noticeable when we displayed a high-contrast still image. We address two aspects in design considerations. First, tiling small modules will reduce the thickness of a large-area projection system and alleviate its self-absorption loss. For seamless tiling, we can attach output couplers to the surface of the transparent plate and extract photoluminescence (PL) photons in each module. Second, the origin of the ghost image is the PL photons reflected at the plate–air interface inside the screen. Thinning the transparent plate facing the projector will eliminate such an optical cross talk.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Ichiro Fujieda, Shunsuke Itaya, Masamichi Ohta, Yuuki Hirai, Takamasa Kohmoto, "Energy-harvesting laser phosphor display and its design considerations," Journal of Photonics for Energy 7(2), 028001 (4 April 2017). https://doi.org/10.1117/1.JPE.7.028001 . Submission: Received: 24 January 2017; Accepted: 22 March 2017
Received: 24 January 2017; Accepted: 22 March 2017; Published: 4 April 2017
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