Patent application number | Description | Published |
20100079431 | OUTPUT BUFFER AND SOURCE DRIVER USING THE SAME - An output buffer and a source driver for a display panel are provided. The output buffer includes a differential input stage, a bias current source, a feedback module, and an output stage. The differential input stage has a first input terminal and a second input terminal receiving a first input signal and a second input signal respectively, and a first output terminal. The bias module provides a bias current to the differential input stage. The output stage has a second output terminal coupled to the first input terminal for providing an output current to the second output terminal based on a signal of the first output terminal. The feedback module adjusts the bias current and the output current based on the first input signal and the second input signal. The output buffer has ability of switching the output voltage to be low level and high level in high-speed. | 04-01-2010 |
20100103152 | SOURCE DRIVING CIRCUIT WITH OUTPUT BUFFER - A source driving circuit adapted to drive a display panel is provided herein. The source driving circuit includes a first output buffer and a second output buffer responsible for enhancing signals with different polarities respectively. As for the first output buffer, the first output buffer includes a first differential input stage, a first output stage and a second output stage. The first output stage includes a first level adjustment circuit and a first self-bias providing circuit. The first level adjustment circuit provides a first level voltage according to input signals received by the first differential input stage, such that the second output stage thereby provides a first charge current and a second charge current to output a first output signal based on the first level voltage. The first self-bias providing circuit provides a first biased voltage associated with one input signal to control the first level adjustment circuit to operate. | 04-29-2010 |
20100171531 | OUTPUT BUFFER WITH HIGH DRIVING ABILITY - An output buffer including a first differential input stage, a primary output stage, and a secondary output stage is provided herein. The first differential input stage respectively receives a first and a second input signals via a first and a second input terminals. The primary output stage includes a first and a second output stages. The first output stage provides at least one first level voltage according to the first and the second input signals, and the second output stage controlled by the first level voltage drives an output terminal of the output buffer to a target level. The secondary output stage includes a comparator and a third output stage. The comparator compares the induced currents in the first differential input stage, and thereby generates a control voltage. The third output stage controlled by the control voltage drives the output terminal of the output buffer to the target level. | 07-08-2010 |
20110032240 | BUFFERING CIRCUIT WITH REDUCED DYNAMIC POWER CONSUMPTION - A buffering circuit with reduced power consumption is provided. The output buffering circuit includes first and second amplifier circuits. The first amplifier circuit includes a first input stage and a first output stage both coupled between a first power voltage and a second power voltage lower than the first power voltage, and an assistant discharging unit configured to provide a discharging current flowing from a first output node to a first intermediate power voltage during a discharging operation of the first amplifier circuit. The second amplifier circuit includes a second input stage and a second output stage both coupled between the first power voltage and the second power voltage, and an assistant charging unit configured to provide a charging current flowing from a second intermediate power voltage to a second output node during a charging operation of the second amplifier circuit. The first and second amplifier circuits can have reduced output voltage ranges and hence reduced total power consumption. | 02-10-2011 |
20110050665 | SOURCE DRIVER AND COMPENSATION METHOD FOR OFFSET VOLTAGE OF OUTPUT BUFFER THEREOF - A source driver and a compensation method for an offset voltage of an output buffer are provided. The source driver includes a storage element, an output buffer, a sampling unit and a first switch. The output buffer has a first input terminal coupled to the storage element and a second input terminal coupled to an output terminal thereof. The output buffer enhances an input signal of the first input terminal and thereby outputs an output signal via the output terminal. The sampling unit respectively transmits a pixel signal and the output signal to the first input terminal of the output buffer and the storage element during a first sub-period for storing an offset voltage of the output buffer in the storage element. The first switch transmits the pixel signal to the storage during a second sub-period for compensating the pixel signal with the offset voltage stored in the storage element. | 03-03-2011 |
20110050677 | SOURCE DRIVER - A source driver adapted to drive a display panel is provided herein. The source driver includes a first output buffer, a detection module and a conversion module. The first output buffer enhances a first pixel signal and thereby outputs a first enhanced pixel signal. The detection module detects a rise time of the first enhanced pixel signal. The conversion module adjusts a driving capability of the first output buffer in response to the rise time for adjusting a slew rate of the first output buffer. Therefore, the first output buffer in the source driver can dynamically and automatically adjusts the slew rate of the first output buffer through a feedback mechanism composed of the detection module and the conversion module. | 03-03-2011 |