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1. (WO2018001701) DRIVING CIRCUIT TO GENERATE A SIGNAL PULSE FOR OPERATING A LIGHT-EMITTING DIODE

Pub. No.:    WO/2018/001701    International Application No.:    PCT/EP2017/064172
Publication Date: Fri Jan 05 00:59:59 CET 2018 International Filing Date: Sat Jun 10 01:59:59 CEST 2017
IPC: H01S 5/062
H03K 5/04
H03K 3/57
G01S 17/32
G01S 7/484
Applicants: AMS AG
Inventors: LUEGER, Manfred
Title: DRIVING CIRCUIT TO GENERATE A SIGNAL PULSE FOR OPERATING A LIGHT-EMITTING DIODE
Abstract:
A driving circuit (10)to generate a signal pulse for operating a light-emitting diode (20) comprises an external terminal (LEDK, LEDA) to connect the light-emitting diode (20) to the driving circuit (10).In a first operating state/pre-charge state of the driving circuit (10), a first controllable switching circuit (100) connects a first side (301) of a capacitor (300) to a reference potential (Vref) and a second controllable switch (200) connects a second side (302) of the capacitor (300)to one of a supply and ground potential (VDD, VSS). In a second operating state of the driving circuit (10), the first controllable switching circuit (100) connects the first side (301) of the capacitor (300) to said one of the supply and ground potential (VDD, VSS) and the second controllable switch (200) connects the second side (302) of the capacitor (300) to the external terminal (LEDK, LEDA)to provide a signal pulse for operating the light emitting diode.