触摸屏线性度问题

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请教触摸屏线性度是怎麽计算的？为何<1.5%的线性度就可以满足实际需要了？1.5%的线性度在实际划线时理论位置和实际位置有多大偏差呢？

1.5％　measuring method,linearity(%)
（Appendix1）：Linearity measuring
After input DC voltage (5V) to upper layer (ITO FILM ) then detect the output voltage from bottom layer (ITO GLASS) ,measure the data at the interval 10mm, as the same way ,detect the output voltage from the upper layer (ITO FILM) by the switching the connection of the upper and bottom layer .
Linearity =ΔE / the theoretical voltage at every scanning line *100%

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