Rewritable Paper Thin LCD Is Flexible, Light and Tought
The team focused on two key innovations for achieving highly flexible designs. The first is the recent development of optically rewritable LCDs. Like conventional LCD displays, the display is structured like a sandwich, with a liquid crystal filling between two plates. Unlike conventional liquid crystals where electrical connections on the plates create the fields required to switch individual pixels from light to dark, optically rewritable LCDs coat the plates with special molecules that realign in the presence of polarized light and switch the pixels. This removes the need for traditional electrodes, reduces the structure’s bulk and allows more choices in the type and thickness of plates.
Optically rewritable LCDs are durable and cheap to manufacture because of their simple structure. Moreover, like an electronic paper screen in an e-book, energy is only required to switch display images or text. Therefore, running costs are low because these new LCDs don’t need power to sustain an image once it is written on the screen.
Credit: Zhang et al.
The researchers tried three different spacer designs and found that a meshlike spacer prevented liquid crystal from flowing when their LCD was bent or hit. This innovation enabled them to create the first flexible optically rewritable LCD.
An additional innovation involved improved color rendering. The scientists report that until this study, optically rewritable LCDs had only been able to display two colors at a time. Now, their optically rewritable LCD simultaneously displays the three primary colors. They achieved this by placing a special type of liquid crystal behind the LCD, which reflected red, blue and green. To make this into a commercial product, Sun wants to improve the resolution of the flexible optically rewritable LCD.
“Now we have three colours but for full colour we need to make the pixels too small for human eyes to see,” Sun said.
Contacts and sources:
Julia Majors
Citation: A flexible optically re-writable color liquid crystal display. Authors: Yihong Zhang, Jiatong Sun, Yang Liu, Jianhua Shang, Hao Liu, Huashan Liu, Xiaohui Gong, Vladimir Chigrinov, Hoi Sing Kowk. Applied Physics Letters, 2018; 112 (13): 131902 DOI: 10.1063/1.5021619
Source: https://www.ineffableisland.com/2018/03/rewritable-paper-thin-lcd-is-flexible.html
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