STEM与日常科技·英语30篇（9）

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触摸屏如何精确定位你的点击

Capacitive screens hold a uniform electrostatic charge across their conductive glass surface.
Your finger disrupts this field locally, changing capacitance at that exact point.
Four corner electrodes measure the altered signal strength to triangulate X-Y coordinates.
Even light touches register because human skin conducts electricity better than air or gloves.
Multi-touch capability comes from scanning the grid rapidly—up to 120 times per second.
Water droplets confuse older systems, but modern chips filter out accidental inputs intelligently.
Screen protectors must be ultra-thin and non-conductive to avoid distorting the field.
Calibration ensures accuracy stays within ±0.5 mm after months of daily use.