| 摘要 |
PURPOSE: A backlight operation control circuit of an LCD is provided to accurately operate constant current driving units within minimum need voltage range by stably outputting a feedback voltage regardless of the variation of a process. CONSTITUTION: A minimum partial voltage unit(250) partitions voltage which is outputted from a minimum voltage selecting unit(240) through a resistance which is connected to a power terminal. A buffer(260) sources the current corresponding to the voltage which is outputted from the minimum partial voltage unit. A feedback voltage output unit(270) feedbacks the output voltage of the buffer to the feedback voltage of a current converter through the resistance. The minimum voltage selecting unit includes a first-third resistance between power terminals.
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