Patent application number | Description | Published |
20090284317 | SOURCE DRIVER OF A DISPLAY, OPERATIONAL AMPLIFIER, AND METHOD FOR CONTROLLING THE OPERATIONAL AMPLIFIER THEREOF - A source driver of a display includes a digital-to-analog converter, an output switch, and an operational amplifier. The operational amplifier is coupled to digital-to-analog converter for driving at least a date line of the display according to the analog pixel signal via the output switch. The operational amplifier receives a bias current, wherein the bias current is boosted only when the output switch is turned off. | 11-19-2009 |
20090295486 | OPERATIONAL AMPLIFIER HAVING ADJUSTABLE BIAS CURRENT AND RELATED SOURCE DRIVER OF DISPLAY THEREOF - An operational amplifier includes an amplifying circuit and a bais current generating circuit. The bias current generating circuit generates a bias current to the amplifying circuit. The amplifying circuit comprises a current adjusting unit and a current mirror. The current adjusting circuit has a storage element, receives a reference current and generating a passing current. The passing current is gradually adjusted utilizing the storage element according to a control signal. The current mirror receives the passing current to generate the bias current. | 12-03-2009 |
20100033411 | SOURCE DRIVER WITH PLURAL-FEEDBACK-LOOP OUTPUT BUFFER - A source driver of a display includes a first channel. The first channel includes a first amplifier, a first output switch, and a first feedback loop. The first output switch selectively connects an output node of the first amplifier to one of output pads of the source driver. The first feedback switch connects an input node of the first amplifier to one of the output pads or the output node of the first amplifier. | 02-11-2010 |
20100052737 | SOURCE DRIVING CIRCUIT FOR PREVENTING GAMMA COUPLING - During transition, level shifters in a source driver output logic high signals to PMOS DACs and output logic low signals to NMOS DACs for shutting down current paths in the PMOS DACs and in the NMOS DACs. Therefore, during transition, the PMOS DACs and the NMOS DACs are at high-impedance stage for preventing gamma coupling effect. | 03-04-2010 |
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 |
20100141494 | DIGITAL-TO-ANALOG CONVERTER HAVING EFFICIENT SWITCH CONFIGURATION - A DAC includes a gamma voltage generator for generating a plurality of gamma voltages, and a decoder for receiving an M-bit digital value for selecting one of the gamma voltages, wherein the decoder comprises a first thermometer encoder, a first selector and a second selector. The first thermometer encoder is utilized to receive N bits of the digital value to generate a first thermometer code with 2 | 06-10-2010 |
20100156855 | OPERATIONAL AMPLIFIER, SOURCE DRIVER OF A DISPLAY, AND METHOD FOR CONTROLLING THE OPERATIONAL AMPLIFIER THEREOF - An operational amplifier includes a first stage, a second stage, and a switching unit. The first stage receives an analog input signal. The second stage has an output node coupled to an output switch. The switching unit is coupled between the first stage and the second stage. The switching unit includes a capacitive component and a first switch coupled to the capacitive component in series. The first switch is turned off when the output switch is turned on. The first switch is turned off while the analog input signal is in transition, and is turned on while the analog input signal is steady. The first switch is turned on when the output switch is turned off. | 06-24-2010 |
20100328126 | DIGITAL TO ANALOG CONVERTER - An embodiment of a digital to analog converter (DAC) with two outputs is provided. The DAC is controlled by an n-bits input signal and comprises a reference voltage circuit generating (2n+1) reference voltages, a first switch array and a second switch array. The first switch array receives and outputs 2 | 12-30-2010 |
20110102037 | CIRCUIT FOR RESETTING SYSTEM AND DELAY CIRCUIT - A reset circuit and a delay circuit are provided. The delay circuit includes a first resistor module, a second resistor module, a switch module and a capacitor module. First terminals of the first and the second resistor modules are coupled respectively to a first voltage and a second voltage. The switch module have a control terminal served as a input terminal of the delay circuit, a first terminal served as a output terminal of the delay circuit, a second terminal coupled to a second terminal of the first resistor module, and a third terminal coupled to a second terminal of the second resistor module. In the delay circuit, the first terminal selectively connected to the second terminal or the third terminal in accordance with the control terminal. The capacitor module couples between the first terminal of the switch module and the second voltage. | 05-05-2011 |
20110128174 | DIGITAL TO ANALOG CONVERTER - A digital to analog converter with two outputs controlled by an input signal with n-bits is disclosed. A reference voltage circuit generates (2 | 06-02-2011 |