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Microstamped optomechanical actuator for tactile displays

机译：用于触觉显示器的微戳印光机械致动器

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Over the last few years, several technologies have been adapted for use in tactile displays, such as thermo-pneumatic actuators, piezoelectric polymers and dielectric elastomers. None of these approaches offers high-performance for refreshable Braille display system (RBDS), due to considerations of weight, power efficiency and response speed. Optical actuation offers an attractive alternative to solve limitations of current-art technologies, allowing electromechanical decoupling, elimination of actuation circuits and remote controllability. Creating these optically-driven devices requires liquid crystal - carbon nanotube (LC-CNT) composites that show a reversible shape change in response to an applied light. This work thus reports on novel opto-actuated Braille dots based on LC-CNT composite and silicon mold microstamping. The manufacturing approach succeeds on producing blisters according to the Braille standard for the visually impaired, by taking shear-aligned LC-CNT films and silicon stamps. For this application, we need to define specifically-shaped structures. Some technologies have succeeded on elastomer microstructuring. Nevertheless, they are not applicable for LC-CNT molding because they do not consider the stretching of the polymer which is required for LC-CNT fabrication. Our process demonstrates that composites micro-molding and their 3-D structuring is feasible by silicon-based stamping. Its work principle involves the mechanical stretching, allowing the LC mesogens alignment.
机译：在过去的几年中，已经将几种技术应用于触觉显示器，例如热气动致动器，压电聚合物和介电弹性体。考虑到重量，功率效率和响应速度，这些方法都无法为可刷新的盲文显示系统（RBDS）提供高性能。光学致动为解决当前技术的局限性提供了一种有吸引力的选择，它可以实现机电去耦，消除致动电路和远程可控制性。创建这些光驱动设备需要液晶-碳纳米管（LC-CNT）复合材料，该复合材料响应于所施加的光而具有可逆的形状变化。因此，这项工作报道了基于LC-CNT复合材料和硅模具微压印的新型光致盲点。该制造方法通过采用剪切对齐的LC-CNT薄膜和硅印章，成功地为盲人制造了根据盲文标准的水泡。对于此应用程序，我们需要定义特殊形状的结构。一些技术已经成功地用于弹性体微结构化。然而，它们不适用于LC-CNT模制，因为它们没有考虑LC-CNT制造所需的聚合物拉伸。我们的过程表明，通过硅基冲压可以对复合材料进行微成型及其3-D结构化。它的工作原理涉及机械拉伸，允许LC介晶对齐。

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