- Patent Title: Light emitting diode (LED) driving circuit with common current sensing resistor and configured to drive LED groups, method of driving the circuit and light apparatus having the same
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Application No.: US16392842Application Date: 2019-04-24
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Publication No.: US10692463B2Publication Date: 2020-06-23
- Inventor: Hyun-jung Kim , Seung-hwan Lee
- Applicant: Magnachip Semiconductor, Ltd.
- Applicant Address: KR Cheongju-si
- Assignee: MagnaChip Semiconductor, Ltd.
- Current Assignee: MagnaChip Semiconductor, Ltd.
- Current Assignee Address: KR Cheongju-si
- Agency: NSIP Law
- Priority: com.zzzhc.datahub.patent.etl.us.BibliographicData$PriorityClaim@5842f64
- Main IPC: G09G3/34
- IPC: G09G3/34 ; G09G3/36 ; H05B45/44

Abstract:
A light emitting diode (LED) driving circuit that sequentially drive a plurality of series-coupled LED groups comprising at least one LED is provided. The LED driving circuit includes a plurality of mid nodes coupled to terminals of the plurality of the LED groups, a common node with a reference voltage, a switch unit configured to form a plurality of current movement paths between the common node and the plurality of the mid nodes and configured to select a current movement path based on a control signal, a current measuring unit configured to detect a current flow through the common node, and a current control unit configured to generate the control signal based on the detected current flow.
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