Electroluminescence and bell: what they have in common

1. Step 1. Electroluminescence — is used in — Pixel matrix (OLED). Each OLED pixel glows by itself under current.
2. Step 2. Pixel matrix (OLED) — is part of — Display. A pixel matrix forms the image.
3. Step 3. Display — is part of — Laptop. A laptop's lid is its screen.
4. Step 4. Laptop — has part — Keyboard. The keyboard is built into the laptop's case.
5. Step 5. Keyboard — is part of — Carillon. A keyboard.
6. Step 6. Carillon — has part — Bell. Bells.

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