Card payment terminal and smart meter: what they have in common

1. Step 1. Card payment terminal — is part of — Self-checkout. Card reader.
2. Step 2. Self-checkout — has part — Touch layer (capacitive). A touchscreen.
3. Step 3. Touch layer (capacitive) — is part of — Display. Under the glass is a touch layer that registers touches.
4. Step 4. Display — evolved from — Liquid-crystal display. The first smartphones had LCD screens.
5. Step 5. Liquid-crystal display — is part of — Smart meter. A display.

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