A pixel element in the matrix of pixel elements includes a light emitting diode, a resistor electrically connecting to the light emitting diode, a data input, and a sensing output. The data input receives a data signal that changes a current flowing through the light emitting diode when the data input is enabled. The sensing output generates a sensing signal when the sensing output is enabled. The sensing output generates substantially no sensing signal when the sensing output is disabled. A change in a current flowing through both the light emitting diode and the resistor induces a change in the sensing signal.

 
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