Nonlinearity Requirement for Passive-Matrix LCDs

• Discrimination ratio D = Lon/Loff

• Pixel Contrast Ratio (PCR) with “sneak circuit”:

PCR = -----------------------------

where M = number of display rows

For Mᡂ and PCRᡂ:

PCR = D/M + 1

=> D > 9M

Lon + (M-1)Loff

MLoff

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