Invention Grant
- Patent Title: Lighting apparatus including light-emitting diodes
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Application No.: US16368875Application Date: 2019-03-29
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Publication No.: US10757781B2Publication Date: 2020-08-25
- Inventor: Keith Hopwood , Hyung Jin Lee , Sung Ho Jin , Sang Wook Han , In Seok Baek
- Applicant: Seoul Semiconductor Co., Ltd.
- Applicant Address: KR Ansan-si
- Assignee: Seoul Semiconductor Co., Ltd.
- Current Assignee: Seoul Semiconductor Co., Ltd.
- Current Assignee Address: KR Ansan-si
- Agency: H.C. Park & Associates, PLC
- Priority: com.zzzhc.datahub.patent.etl.us.BibliographicData$PriorityClaim@1afbd806
- Main IPC: H05B45/37
- IPC: H05B45/37 ; H03K5/24 ; H05B45/14 ; H05B45/20 ; H05B45/24 ; H05B45/44

Abstract:
A lighting apparatus including an LED circuit including a plurality of serially connected stages configured to receive a modulated rectified voltage, each of the stages including a first path including a first resistor and a first LED connected in series, and a second path connected to the first path in parallel and including a second LED configured to emit light having a color temperature different from that emitted from the first LED, and a driving current controller configured to adjust an intensity of light output from the LED circuit by adjusting currents applied to driving nodes connected to the stages, depending on a dimming signal associated with a dimming level of the rectified voltage, in which a threshold voltage of the first LED is lower than that of the second LED.
Public/Granted literature
- US20190306942A1 LIGHTING APPARATUS INCLUDING LIGHT-EMITTING DIODES Public/Granted day:2019-10-03
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