Output buffer having improved slew rate of output signal in source driver of liquid crystal display

摘要

Is an improvement on the slew rate of the output signal from the source driver of the liquid crystal display output buffer is disclosed. The output buffer in accordance with an embodiment of the present invention includes a differential amplifier unit, and an output control unit. Receiving a differential amplifier portion switching signal and the inverted switching signal, and a differential input for an input signal and output signal of logic level opposite to the logical level of the pull-up signal and the pull-up signal having a logic level opposite to the logical level of the input signal which generates a control signal. The control unit from the low level of the input signal, in response to a first bias voltage having a predetermined voltage level and the control signal to set the output node to a voltage level of the control voltage. The output unit of the voltage level output signal in response to the pull-up signal and the first bias voltage output from the output node is controlled to swing between the supply voltage and the control voltage. Voltage level of the control voltage may be half the voltage level of the supply voltage. Described above present the output buffer improve the slew rate of the output signal from the source driver of the liquid crystal display device according to the invention improves the output parts of the drivability by controlling the voltage level of the output node by the control as to the slew rate of the output signal It has the advantage of reducing the power consumption as well as to improve.