| 摘要 |
<p>A circuit arrangement is disclosed, the arrangement comprising a first light emitting diode and a second light emitting diode emitting light of different colours arranged adjacent to each other for additive colour mixing; a first and a second controllable current source connected to the first and a second light emitting diode, respectively, such that the load currents of the light emitting diodes depend on respective control signals received by the current sources; a first and a second sigma-delta modulator connected to the first and the second light emitting diode, respectively, and providing bit-streams as control signals to the current sources, whereby the mean value of each bit-stream corresponds to the value of an input signal of the respective sigma-delta modulator.</p> |
