Gamma voltage supply circuit and method and power management IC

摘要

The present invention provides a gamma voltage supply circuit capable of stably supplying a gamma voltage in response to the change of external voltage and a power management IC including the same. The gamma voltage supply circuit generates a regulating voltage using an internal voltage which is not influenced by the variation in load of a source driver IC, and generates a gamma voltage using the regulating voltage.

主权项

1. A gamma voltage supply circuit comprising:
an internal voltage generator configured to generate an internal voltage which is boosted, by using an external voltage, and supply the internal voltage to a current control element; and a digital-to-analog converter configured to generate a regulating voltage by regulating the internal voltage through the current control element, generate gamma voltages corresponding to a plurality of channels, by using the regulating voltage, and supply the gamma voltages to one or more selected channels, wherein the digital-to-analog converter comprises the current control element comprising a MOS transistor, and wherein the current control element is configured to regulate the internal voltage supplied from the internal voltage generator in response to an output current, and output the regulating voltage, wherein the digital-to-analog converter further comprises: a comparison circuit configured to compare a reference voltage and a feedback voltage, and supply the output current corresponding to a result of the comparison to the current control element; and a sensing circuit configured to sense the regulating voltage outputted from the current control element, and supply the feedback voltage corresponding to a result of the sensing to the comparison circuit.