LED BACKLIGHT DRIVE CIRCUIT

WIPO Patent Application WO/2013/013451

A1

An LED backlight drive circuit, including a plurality of LED twinkle lights (21) connected in parallel, a constant current control circuit (22) used for controlling the magnitude of the current passing through each of the LED twinkle lights (21) as the same, and a plurality of constant voltage units (28) of the same number as the number of LED twinkle lights (21). The plurality of constant voltage units (28) are respectively connected between the plurality of LED twinkle lights (21) and the constant current control circuit (22). A constant voltage unit (28) includes a MOS tube (Q3) and a first operational amplifier (OP3). The drain electrode of the MOS tube (Q3) is connected with the negative electrode of a LED twinkle light (21); the grid electrode thereof is connected with the output end of the first operational amplifier (OP3); and the source electrode thereof is connected with the constant current control circuit (22). The positive phase input end of the first operational amplifier (OP3) accesses a reference voltage (V2), and the negative phase input end thereof is connected with the source electrode of the MOS tube (Q3). The LED backlight drive circuit has a relatively high stability.

GAO XINMING (CN)

PCT/CN2011/080922

January 31, 2013

October 18, 2011

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SHENZHEN CHINA STAR OPTOELECT (CN)
GAO XINMING (CN)

H05B37/02; G09G3/34

CN102065601A	2011-05-18
CN201838299U	2011-05-18
CN101207950A	2008-06-25
CN1578095A	2005-02-09
CN201854479U	2011-06-01
CN102111932A	2011-06-29
CN101083860A	2007-12-05
CN201315687Y	2009-09-23

SHENZHEN CENTURY-FOREVER INTELLECTUAL PROPERTY OFFICE (CN)
深圳市世纪恒程知识产权代理事务所 (CN)

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