Hello,
No, there are no effects if different voltages are used to supply VDD and VLCD since they are not internally connected, VDD is used as the supply for the internal device functionality, while VLCD is the supply dedicated for pins which interface with the LCD.
Just take in mind that static voltages across the liquid crystal display can build up when the LCD supply voltage (VLCD) is on while the IC supply voltage (VDD) is off, or vice versa. This may cause unwanted display artifacts. To avoid such artifacts, VLCD and VDD must be applied or removed together
Have a great day,
Jose
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