Patent ID: 9082366
Filing Date: 2015-07-14
Classification: G09G,H02M

Abstract:
1. A power converting circuit of a display driver, comprising: a positive voltage generator including a first capacitive DC-DC (Direct Current-Direct Current) converter and a first inductive DC-DC converter, the positive voltage generator configured to generate a positive source voltage by selectively using one of the first capacitive DC-DC converter, the first inductive DC-DC converter, or a first external power supply voltage; and a negative voltage generator including a second capacitive DC-DC converter and a second inductive DC-DC converter, the negative voltage generator configured to generate a negative source voltage by selectively using one of the second capacitive DC-DC converter, the second inductive DC-DC converter, or a second external power supply voltages; wherein the positive voltage generator is configured to use the first capacitive DC-DC converter, the first inductive DC-DC converter, and the first external power supply voltage in an order of the first capacitive DC-DC converter, the first inductive DC-DC converter, and the first external power supply voltage as an amount of a source current supplied from a source driver to a display panel increases, and wherein the negative voltage generator is configured to use the second capacitive DC-DC converter, the second inductive DC-DC converter, and the second external power supply voltage in an order of the second capacitive DC-DC converter, the second inductive DC-DC converter, and the second external power supply voltage as the amount of the source current increases.