Indicator apparatus, method of operation and illumination apparatus
First Claim
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1. A method for operating an indicator apparatus which has at least two light-emitting diodes, comprising the steps of:
- producing a pulse-width-modulated signal, which has at least one switched-on time and at least one switched-off time, by means of a pulse width modulation circuit;
routing the pulse-width-modulated signal to a demultiplexer; and
synchronizing the pulse width modulation circuit and the demultiplexer, so that the pulse-width-modulated signal is routed from the demultiplexer to one light-emitting diode of the at least two light-emitting diodes during one of the switched-off times of the pulse-width-modulated signal.
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Abstract
An indicator apparatus, having a pulse width modulation circuit (1), a demultiplexer (2) which has at least one signal input (21) and at least two signal outputs (22), wherein the signal input (21) is connected to the pulse width modulation circuit (1), and at least two light-emitting diodes (3) which are each connected to a signal output (22) of the demultiplexer.
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Citations
13 Claims
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1. A method for operating an indicator apparatus which has at least two light-emitting diodes, comprising the steps of:
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producing a pulse-width-modulated signal, which has at least one switched-on time and at least one switched-off time, by means of a pulse width modulation circuit; routing the pulse-width-modulated signal to a demultiplexer; and synchronizing the pulse width modulation circuit and the demultiplexer, so that the pulse-width-modulated signal is routed from the demultiplexer to one light-emitting diode of the at least two light-emitting diodes during one of the switched-off times of the pulse-width-modulated signal. - View Dependent Claims (2, 3, 4, 10, 11, 12)
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5. An indicator apparatus comprising:
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a pulse width modulation circuit; a demultiplexer which has at least one signal input and at least two signal outputs, wherein the signal input is connected to the pulse width modulation circuit and the demultiplexer has more signal outputs than signal inputs; and at least two light-emitting diodes which are each connected to a signal output of the demultiplexer, wherein the at least two light-emitting diodes are supplied with operating current by the demultiplexer; and wherein, during operation of the indicator apparatus, the demultiplexer and the pulse width modulation circuit are synchronized such that a pulse-width-modulated signal produced during operation of the pulse width modulation circuit is routed from the demultiplexer to one light-emitting diode of the at least two light-emitting diodes during a switched-off time of the pulse-width-modulated signal. - View Dependent Claims (6, 7, 8, 9, 13)
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Specification