1. Fast full-color reflective display via photoluminescent enhancement.
- Author
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Gibson, Gary, Xia Sheng, Henze, Dick, Si-Ty Lam, Beck, Patricia, Jeon, Yoocharn, Zhou, Zhang-Lin, Benson, Brad, Qin Liu, Combs, Gregg, Koch, Tim, and Biggs, Kent
- Subjects
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PHOTOLUMINESCENCE , *MOBILE communication systems , *INFORMATION display systems , *LIQUID crystals , *LIQUID crystal devices - Abstract
Reflective displays are advantageous in applications requiring low power or daylight readability. However, there are no low-cost reflective technologies capable of displaying bright colors. By employing photoluminescence to more efficiently use ambient light, we created a prototype display that provides bright, full color in a simple, low-cost architecture. This prototype includes a novel electrokinetic shutter, a layer that incorporates patterned luminescent red, green, and blue sub-pixel elements, and a novel optical out-coupling scheme. The luminescent elements convert otherwise-wasted portions of the incident spectrum to light in the desired color band, resulting in improved color saturation and lightness. This prototype provides a color gamut that is superior to competing reflective display technologies that utilize color filters in single-layer side- by-side sub-pixel architectures. The current prototype is capable of switching in <0.5s; future displays based on an alternative electro-optic shutter technology should achieve video rate operation. A transflective version of this technology has also been prototyped. The transflective version utilizes its backlight with a power efficiency that is at least three times that of a conventional liquid crystal display. These photoluminescence-based technologies enable a host of applications ranging from low-power mobile products and retail pricing signage to daylight readable signage for outdoor advertising segments. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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