We propose a pixel-level automatic calibration circuit scheme that initializes a capacitive fingerprint sensor LSI to eliminate the influence of the surface condition, which is degraded by dirt during practical use. The calibration is executed by adjusting the variable capacitance in each pixel to make the sensed signals of all pixels the same. A fingerprint sensor LSI using the 0.5-/spl mu/m CMOS process/sensor process demonstrates that clear fingerprint images are always obtained by the scheme though the surface condition degrades. The proposed scheme ensures consistent clear image capture during long-term usage.
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机译：我们提出了一种像素级自动校准电路方案，该方案可初始化电容式指纹传感器LSI以消除表面条件的影响，该表面条件在实际使用中会因灰尘而变差。通过调节每个像素中的可变电容以使所有像素的感测信号相同来执行校准。使用0.5- / splμm/ m CMOS工艺/传感器工艺的指纹传感器LSI证明，尽管表面条件变差，但始终可以通过该方案获得清晰的指纹图像。所提出的方案可确保长期使用过程中始终如一的清晰图像捕获。
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