Patent ID: 8605074

Claim:
An apparatus for supplying a power voltage to a pixel unit of a display apparatus, the apparatus comprising: a first power supplying unit configured to apply the power voltage to the pixel unit during a normal mode, the first power supplying unit including: an output amplifier configured to output the power voltage, and a feedback loop being formed between an output terminal of the output amplifier and a second input terminal of the output amplifier, the feedback loop including an intermediate node that is directly or indirectly coupled to a ground line; a second power supplying unit configured to apply the power voltage to the pixel unit during a low power display mode; and a leakage current blocking unit configured to block a leakage current path from the second power supplying unit to the first power supplying unit during the low power display mode, the leakage current blocking unit including a switching device between the output terminal of the output amplifier and the intermediate node.