fig7
![Recent progress in flexible piezoelectric devices toward human-machine interactions](https://image.oaes.cc/e5513ded-88f2-4c95-a5e3-5fc66ebd50ad/5316.fig.7.jpg)
Figure 7. Outlook for P-HMIs: from piezoelectric materials to future applications. Reproduced with permission from ref.[98]. Copyright 2008, Elsevier. Reproduced with permission from ref.[99]. Copyright 2009, AIP Publishing LLC. Reproduced with permission