The only issue I have heard about is some "I2C" serial LCD's not having an I2C address and therefore not playing nice with other I2C devices like the RTC. A normal 6/10-pin parallel LCD should not cause that problem.
The only issue I have heard about is some "I2C" serial LCD's not having an I2C address and therefore not playing nice with other I2C devices like the RTC. A normal 6/10-pin parallel LCD should not cause that problem.