I found this TouchPad inside a toy mimicking a smartphone and I am curious about the technology, which seems to be embedded in a simple transfer plastic sheet like those used for projectors.
What should I Google to start my quest?
Thanks. 
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\$\begingroup\$ It's a Membrane Keypad. \$\endgroup\$– brhansCommented Feb 18, 2023 at 22:02
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\$\begingroup\$ what is your quest? \$\endgroup\$– jsotolaCommented Feb 18, 2023 at 22:35
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2 Answers
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The whole assembly looks like a 4x4 keyboard. To work, the black stuff on the top sheet of clear plastic will need to be conductive plastic. I'd suggest searching on "conductive ink" or "conductive polymer".
answered Feb 18, 2023 at 21:22
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The material is likely "carbon ink", which is an ink that can withstand being exposed to oxygen and will conduct electricity. The keypad will short the comb-structure on key-press.
