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CCS/MSP430G2333: Question about duplex backplane in document "Software Glass LCD Driver Based on MSP430 MCU"

Part Number: MSP430G2333

Tool/software: Code Composer Studio

hi all,

I'm reading the document "Software Glass LCD Driver Based on MSP430 MCU", which i was downloaded here: http://www.ti.com/lit/an/slaa516a/slaa516a.pdf?ts=1588660897867

In this documents, i don't understand why the corresponding display segment in this picture is OFF 

Someone please explain to me. Thank you