Invention Grant
- Patent Title: LED drive circuit and LED driving method
- Patent Title (中): LED驱动电路和LED驱动方式
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Application No.: US13494050Application Date: 2012-06-12
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Publication No.: US09030114B2Publication Date: 2015-05-12
- Inventor: Kohzaburoh Murakami
- Applicant: Kohzaburoh Murakami
- Applicant Address: JP Osaka
- Assignee: Sharp Kabushiki Kaisha
- Current Assignee: Sharp Kabushiki Kaisha
- Current Assignee Address: JP Osaka
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JP2011-185146 20110826
- Main IPC: H05B37/02
- IPC: H05B37/02 ; H05B33/08
Abstract:
An LED drive circuit of the present invention carries out, by use of a DC-to-DC converter, light control of an LED. The light control is carried out, in a region where a light control level is equal to or greater than a certain light control level, by a DC light control method for adjusting a pulse height of an LED drive current. The light control is carried out, in a region where a light control level is equal to or less than the certain light control level, by a PDM light control method for adjusting an off period of oscillation of the DC-to-DC converter.
Public/Granted literature
- US20130049623A1 LED DRIVE CIRCUIT AND LED DRIVING METHOD Public/Granted day:2013-02-28
Information query
