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自电容触摸按键结构问题

两种结构方式,从稳定性方面考虑,哪种更好一些?
1. PCB+2.4mm背光板+1.5mm钢化玻璃
2. 带LED的PCB + 弹簧 + 1.5mm钢化玻璃 (LED在弹簧中间)