Patent ID: 8120555

Claim:
An active-matrix circuit for controlling an LED display pixel, the active-matrix circuit comprising: a control circuit responsive to control signals for storing a luminance value in a storage circuit during a frame period; a drive circuit responsive to the storage circuit for controlling current through an LED to emit light at a luminance level determined by the luminance value; a luminance-value reduction circuit connected to the storage circuit that controls a reduction of the luminance value stored in the storage circuit during the frame period; and a reduction-control circuit responsive to a reduction-control signal connected to the luminance-value reduction circuit to control rate at which the luminance value reduction circuit reduces the luminance value, wherein the reduction-control circuit is a transistor, and wherein: the storage circuit comprises a capacitor for storing a charge representative of the luminance value, the luminance-value reduction circuit comprises a resistor connected in parallel across the capacitor, and the reduction-control transistor comprises connected in series with the resistor to control the flow of current through the resistor in response to the reduction-control signal.