Patent ID: 8169425
Filing Date: 2012-05-01
Classification: G09G

Abstract:
1. A source driver, adapted to a display panel, comprising: an output buffer, having an input terminal receiving a pixel signal, and an output terminal coupled the display panel for outputting an output signal; and a regulating unit, coupled to the output terminal of the output buffer for providing a charging current or a discharging current to the output terminal of the output buffer according to the polarity of the pixel signal, and thereby increasing a slew rate of the output signal, wherein the regulating unit comprises: a multiplexer, receiving an indication signal, and thereby generating a first control signal and a second control signal according to the polarity of the pixel signal; a first source follower, having a control terminal receiving the pixel signal, a first terminal coupled to a first voltage and a second terminal; a first switch, having a first terminal coupled to the second terminal of the first source follower and a second terminal coupled to the output terminal of the output buffer, wherein the first switch is conducted according to the first control signal for providing the charging current to the display panel through the first source follower; a second source follower, having a control terminal receiving the pixel signal, a first terminal coupled to a second voltage and a second terminal; and a second switch, having a first terminal coupled to the second terminal of the second source follower and a second terminal coupled to the output terminal of the output buffer, wherein the second switch is conducted according to the second control signal for providing the discharging current to the display panel through the second source follower.