Chris ChungI 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.
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It is both expensive (for a hobbyist) and cheap (for commercial) at the same time. The design is from the old HP-41C calculator although it is not a direct clone. I specify the requirements and general layout and the factory draw it. After a few iterations / alternations it is finalized. It cost me less than a thousand US to get a dozen samples. I can get the unit cost to about $10 but I need to order batches of a few hundreds.
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Oh that display is sweet. Did you design the LCD? Where was it manufactured? How much does it cost?
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