发明名称 |
Brightness adjusting device and liquid crystal display having the same |
摘要 |
<p>A brightness adjusting device includes a multiplication circuit, which multiplies a vertical signal by a predetermined multiplication ratio to output a multiplication signal, a differential circuit that distinguishes between different multiplication signals, a serrated wave generator that charges/discharges a condenser according to a signal output from the differential circuit and generates a serrated wave having constant amplitude independently of a frequency of the multiplication signal, a brightness adjusting voltage generator that generates a reference voltage to determine a pulse duty, and a comparator that outputs a pulse signal by comparing a voltage of the serrated wave with the brightness adjusting voltage. The brightness adjusting voltage generator includes a circuit that outputs a variable voltage, and the multiplication circuit includes a circuit having a variable multiplication ratio.</p> |
申请公布号 |
EP1901590(A1) |
申请公布日期 |
2008.03.19 |
申请号 |
EP20070017659 |
申请日期 |
2007.09.10 |
申请人 |
SAMSUNG ELECTRONICS CO., LTD. |
发明人 |
HAN, SONG-YI;SHIMURA, TATSUHISA;SENGOKU, OSAMU |
分类号 |
H05B41/38 |
主分类号 |
H05B41/38 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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