I ordered custom made LCD glass for this project. They are about the same size of the original HP-41C display. It's a 14 segment display w/ 12 digits.
The LCD glass is made w/ 6 Mux and 1/3 bias. With 1/6 duty cycle the contrast is not the best but there are so many segments and my target controller for this project does not have enough segment pins for a 4 Mux.
I have not yet make this into a PCB so I am testing drive the LCDs w/ a test rig setup of GPIO direct driving the display. Resistor arrays are used to allow for setting proper bias voltages.