A display apparatus is provided. The display apparatus includes a circuit coupled to at least one energy harvester, wherein the circuit is configured to receive at least one signal that is representative of a detected energy output from the energy harvester. The circuit is also configured to generate at least one output representative of a quantification of the detected energy output. A display interface is coupled to the circuit and is configured to display the output generated by the circuit.
https://app.acclaimip.com/pdf/bWA0BTLJn3zpYDRg18mfcIJI3q48U2U1zPEsT2w/US20140018942A1
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