CIRCUITS AND METHODS FOR CONTROLLING CURRENT IN A LIGHT EMITTING DIODE ARRAY

CIRCUITS AND METHODS FOR CONTROLLING CURRENT IN A LIGHT EMITTING DIODE ARRAY

In one embodiment, a circuit comprises a current source to produce current to a light emitting diode array. An analog dimming circuit generates a continuous control signal to the current source to control the current in the light emitting diode array according to a range of control signal values whe...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: LIU, Bing, RUTKOWSKI, Joseph D, STOCKSTAD, Troy
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
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Beschreibung
Zusammenfassung:In one embodiment, a circuit comprises a current source to produce current to a light emitting diode array. An analog dimming circuit generates a continuous control signal to the current source to control the current in the light emitting diode array according to a range of control signal values when the control signal is above a threshold. Below the threshold, a digital modulation circuit generates an additional modulated digital signal to the current source to control the current in the light emitting diode array according to a range of modulation values when the continuous control signal is below the threshold. The continuous control signal produces current from the current source into the light emitting diode array above a first value. The combination of the continuous control signal and the modulated digital signal produces current in the light emitting diode array below the first value.