Pressure-Sensitive Touch Panel Based on Piezoelectric Poly(L-lactic acid) Film
Pressure-Sensitive Touch Panel Based on Piezoelectric Poly(L-lactic acid) Film
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DOI：
10.7567/jjap.52.09kd17
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发表时间：
2013-09-01
影响因子：
1.5
通讯作者：
Tajitsu, Yoshiro
中科院分区：
文献类型：
--
作者：
Ando, Masamichi;Kawamura, Hideki;Tajitsu, Yoshiro
聚乳酸（PLA）是一种广泛应用的生物质衍生聚合物。它是手性的，因为乳酸单体具有不对称碳。如果L-丙交酯聚合，则PLA聚合物为L型PLA或聚（L-乳酸）（PLLA）;如果PLA中的D-丙交酯聚合，则聚合物为D型PLA（PDLA）。当这些聚合物经受拉伸或伸长时，它们表现出剪切压电性。PLA膜是高度透明的，并且由于缺乏本征偏振而不表现出热电性。因此，如果PLLA膜用于通过压力操作的触摸面板，则不存在由于来自手指的加热而引起的寄生信号。这表明PLLA膜可适用于使用压力检测的触摸面板。我们使用PLLA作为具有多个电极的投射电容式触摸面板的基膜，并展示了对施加在屏幕上的压力敏感的多点触摸手势屏幕。这种触摸面板技术具有用于智能电话和平板个人计算机的潜在应用。(C)2013日本应用物理学会
Poly(lactic acid) (PLA) is a widely used biomass-derived polymer. It is chiral because the lactic acid monomer has an asymmetric carbon. If the L-lactide is polymerized, then the PLA polymer is an L-type PLA or poly(L-lactic acid) (PLLA); if the D-lactide in PLA is polymerized, then the polymer is a D-type PLA (PDLA). When these polymers undergo drawing or elongation, they exhibit shear piezoelectricity. PLA films are highly transparent and do not exhibit pyroelectricity because of the lack of intrinsic polarization. Therefore, if a PLLA film is used for a touch panel, which is operated by pressure, there is no spurious signal due to heating from the fingers. This suggests that PLLA films may be suitable for touch panels using pressure detection. We used PLLA as the base film of a projected capacitive touch panel with multiple electrodes, and demonstrated a multitouch gesture screen that was sensitive to pressure applied on the screen. This touch panel technology has potential applications for smart phones and tablet personal computers. (C) 2013 The Japan Society of Applied Physics