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Replying to @bradanlane
The second resource is this ST app note that walks through doing exactly what you’re describing. Note in particular the diagram on page 13 that shows a circuit for generating the bias voltages; this lets you drive the COM lines high, low, or to 1.5 volts. https://www.st.com/resource/en/application_note/cd00176444-stm32f10xxx-lcd-glass-driver-firmware-stmicroelectronics.pdf
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