Patent application number | Description | Published |
20110043216 | CIRCUIT STRUCTURE FREE FROM TEST EFFECT AND TESTING METHOD THEREOF - A circuit structure free from test effect is provided. The circuit structure includes a first test terminal and a second test terminal. A symmetric circuit unit is coupled between the first test terminal and the second test terminal. The symmetric circuit unit includes a plurality of transistors, wherein the transistors are symmetrically disposed to form a first part circuit and a second part circuit. A switch control unit alternatively connects the transistors of the first part circuit and the transistors of the second part circuit between the first test terminal and the second test terminal according to a control signal. | 02-24-2011 |
20110062924 | SWITCHING APPARATUS AND CONTROL SIGNAL GENERATOR THEREOF - A switching apparatus has a switch and a control signal generator. The control signal generator is configured to generate a control signal applied to the switch to control the operations of turning on and off of the switch. The control signal generator has an inverter and a regulating circuit. The input end of the inverter receives an input signal, and the output end of the inverter outputs the control signal. The regulating circuit has a switching unit and a capacitor. A first end of the switching unit is coupled to the output end of the inverter, a second end of the switching unit is coupled to a first system voltage, a third end of the switching unit is coupled to a first end of the capacitor, and a second end of the capacitor is coupled to a second system voltage. | 03-17-2011 |
20110069053 | DRIVING CIRCUIT OF LIQUID CRYSTAL DISPLAY - A driving circuit of a liquid crystal display including a first input port, a second input port, a first gamma buffer, a second gamma buffer, and a switching circuit is provided. A plurality of first gamma voltages are inputted from the first input port, and a plurality of second gamma voltages are inputted from the second input port. The switching circuit switches the connections between the two input ports and the two gamma buffers, such that a first line of pixels of the liquid crystal display receives the gamma voltages from the first gamma buffer within a first frame period and a second frame period, and that a second line of pixels of the liquid crystal display receives the gamma voltages from the second gamma buffer within the first frame period and the second frame period. | 03-24-2011 |
20110102081 | AMPLIFIER CIRCUIT WITH OVERSHOOT SUPPRESSION - An amplifier circuit with overshoot suppress scheme including an input amplifier, an output amplifier, and a diode is provided. A first and a second input ends of the output amplifier are coupled to a differential output pair of the input amplifier. A first end of the diode is coupled to an output end of the output amplifier. A second end of the diode is coupled to the first input end of the output amplifier. When the voltage difference between the output and the input ends of the output amplifier is greater then the barrier voltage of the diode, the diode is turned on, so that the output end of the output amplifier is coupled to the input end of the output amplifier. In the transient state, it rapidly smoothes the overshoot signal. In the steady state, the diode is cut off to maintain the normal operation of the operational amplifier. | 05-05-2011 |
20110181353 | TWO-CHANNEL OPERATIONAL AMPLIFIER CIRCUIT - A two-channel operational amplifier circuit includes a first operational amplifier and a second operational amplifier. In a first frame period, the two-channel operational amplifier circuit switches a first input stage, a first gain stage and a first output stage to work between a working voltage and a half working voltage, and switches a second input stage, a second gain stage and a second output stage to work between the half working voltage and a ground voltage. In a second frame period, the two-channel operational amplifier circuit switches the second input stage and the second gain stage to work between the working voltage and the half working voltage, and switches the first input stage and the first gain stage to work between the half working voltage and the ground voltage. | 07-28-2011 |
20110187456 | Coupling Isolation Method and Operational Amplifier Using the Same - A coupling isolation method for preventing a load signal from coupling into an operational amplifier is disclosed. The coupling isolation method includes generating a system signal before the operational amplifier outputs a computation result, switching off a Miller compensation signal path of the operational amplifier at a first time point according to the system signal, and electrically connecting an output end of the operational amplifier and a load at a second time point according to the system signal to output the computation result. | 08-04-2011 |
20120119834 | AMPLIFIER CIRCUIT WITH OVERSHOOT SUPPRESSION - An amplifier circuit with overshoot suppress scheme including an input amplifier, an output amplifier, and a diode is provided. A first and a second input ends of the output amplifier are coupled to a differential output pair of the input amplifier. The diode is coupled between an output end and the first input end of the output amplifier. When the voltage difference between the output and the input ends of the output amplifier is greater then the barrier voltage of the diode, the diode is turned on, so that the output end of the output amplifier is coupled to the input end of the output amplifier. In the transient state, it rapidly smoothes the overshoot signal. In the steady state, the diode is cut off to maintain the normal operation of the operational amplifier. | 05-17-2012 |
20120188012 | Operational Amplifier Device - An operational amplifier device includes an operational amplifier, a first transmission gate, and a first switch module. The operational amplifier includes an output stage, which has a first signal input terminal and a signal output terminal, and outputs an output voltage at the signal output terminal. The first transmission gate is coupled between the signal output terminal and a transmission output terminal, having a first transmission control terminal. The first switch module is utilized for controlling electrical connection between the first signal input terminal and the first transmission control terminal. During a first transmission period, the first switch module controls the first transmission control terminal to be coupled to the first signal input terminal, thereby conducting the first transmission gate to not only transmit the output voltage but also act as a Miller capacitor. | 07-26-2012 |
20120188015 | AMPLIFIER - An amplifier includes an output stage circuit, a current source, a PMOS input pair, an NMOS input pair and a current transferring circuit. The output stage circuit is electrically coupled to a supply voltage and a ground voltage. The current source has a node to provide a current. The PMOS input pair is coupled to the node and the ground voltage and controlled by an input voltage. The NMOS input pair coupled to the supply voltage is controlled by the input voltage. The current transferring circuit is coupled to the node and the NMOS input pair. When the input voltage is less than a specific value, the current flows into the PMOS input pair through the node. When the input voltage is larger than or equal to the specific value, the current flows into the NMOS input pair through the node and the current transferring circuit. | 07-26-2012 |
20120194575 | GAMMA-VOLTAGE GENERATOR - A gamma-voltage generator is provided to generating a plurality of first gamma voltages and second gamma voltages. At least one of the first gamma voltages generated by DACs of the gamma-voltage generator within a first frame period and at least one of the second gamma voltages generated by the DACs within a second frame period are outputted from a same one of the gamma buffers of the gamma-voltage generator, whereby the transmitted gamma voltages have substantially equal offset. Therefore, the display quality approaches an ideal condition. | 08-02-2012 |
20130002353 | MULTI-INPUT OPERATIONAL AMPLIFIER AND OUTPUT VOLTAGE COMPENSATION METHOD THEREOF - An output error compensation method adapted to a multi-input operational amplifier is disclosed. The output error compensation method includes following steps. A plurality of original transconductances of a plurality of differential pairs is obtained regarding a specific combination of input voltages received by the differential pairs. Transconductance differences of a plurality of adjustable differential pairs among the differential pairs are obtained according to the original transconductances. Adjusted transconductance of the adjustable differential pairs are obtained according to the original transconductances and the transconductance differences. Transconductances of the adjustable differential pairs are respectively adjusted according to the adjusted transconductances, so that an output voltage can match an expected value when each of a plurality of combinations of the input voltages is received. | 01-03-2013 |
20130002356 | OPERATIONAL AMPLIFIER - An operational amplifier including a primary differential input pair, a primary tail current source module, N auxiliary differential input pairs, and N auxiliary tail current source modules is disclosed. A first and a second input terminal of the primary differential input pair respectively receive a first and a second input signal, wherein first input signal and the second input signal are differential to each other. The primary tail current source module supplies a tail current to the primary differential input pair during a first time interval. A first and a second input terminal of each of the auxiliary differential input pairs respectively receive the first and the second input signal. Each of the auxiliary tail current source modules supplies an auxiliary tail current to the corresponding auxiliary differential input pair during a second time interval. The first time interval and the second time interval partially overlap each other. | 01-03-2013 |
20130241631 | OUTPUT STAGE CIRCUIT - An output stage circuit includes: a first transistor, including a first terminal coupled to a first node, a second terminal coupled to an output terminal, a third terminal coupled to an input terminal for receiving an input voltage, and a fourth terminal coupled to a first power terminal for receiving a first voltage; a second transistor, including a first terminal coupled to a second node, a second terminal coupled to the output terminal, a third terminal coupled to the input terminal for receiving the input voltage, and a fourth terminal coupled to ground; and a current source, coupled to the output terminal for providing a constant current. | 09-19-2013 |
20130241910 | DRIVING CONTROL METHOD AND SOURCE DRIVER THEREOF - A driving control method for a source driver is disclosed. The driving control method includes outputting a positive display voltage signal to a first output buffer of the source driver and outputting a negative display voltage signal to a second output buffer of the source driver according to a first control signal; and outputting a black-frame voltage signal to the first output buffer and the second output buffer according to a second control signal. | 09-19-2013 |
20130342109 | DRIVING CIRCUIT OF FLAT DISPLAY - A driving circuit of flat display including a charging circuit path, a discharging circuit path, and a detecting circuit is provided. The charging circuit path has first and second impedance states, wherein an impedance value of the first impedance state is smaller than that of the second impedance state. The discharging circuit path has third and fourth impedance states, wherein an impedance value of the third impedance state is smaller than that of the fourth impedance state. The detecting circuit detects whether the charging circuit path or the discharging circuit path is in an unstable first state or stable second state, controls the charging circuit path to the first impedance state or the discharging circuit path to the third impedance state in the first state, and controls the charging circuit path to the second impedance state or the discharging circuit path to the fourth impedance state in the second state. | 12-26-2013 |
20140004725 | CHIP PACKAGE | 01-02-2014 |
20140009373 | Digital to Analog Converter and Source Driver Chip Thereof - A digital to analog converter for a source driver chip of a liquid crystal display device is disclosed. The digital to analog converter comprises an output terminal for outputting an output voltage, a plurality of receiving terminals for receiving a plurality of Gamma voltages, and a plurality of transmission paths comprising a plurality of first-type transistors coupled between the plurality of receiving terminals and the output terminal, respectively, for outputting one of the plurality of Gamma voltages as the output voltage according to a digital select signal; wherein a first transmission path corresponding to a first receiving terminal receiving a first Gamma voltage closest to a middle voltage among the plurality of Gamma voltages has lower on-resistance than other transmission paths among the plurality of transmission paths when a same source-to-gate voltage is applied. | 01-09-2014 |
20140009506 | DRIVING VOLTAGE GENERATOR AND DIGITAL TO ANALOG CONVERTER - A digital to analog converter is disclosed. The digital to analog converter includes a voltage selector, M voltage transmitting switches and a selecting signal decoder. The voltage selector receives N first voltages among a plurality of analog input voltages, and receives a plurality of digital selecting signals. The voltage selector selects at most one of the first voltages for providing to an output terminal. One terminals of the voltage transmitting switches receives M second voltages among the input voltages respectively, and the voltage transmitting switches are turned on or off according to M transmitting enable signals respectively. The selecting signal decoder generates the transmitting enable signals according to the selecting signals. Wherein, M and N are positive integers. | 01-09-2014 |
20140015587 | LEVEL SHIFTING CIRCUIT WITH DYNAMIC CONTROL - A level shifting circuit with dynamic control includes a dynamic controller and a level shifter. The dynamic controller outputs a dynamic voltage and an output data signal. The level shifter under control by the dynamic controller includes an input signal receiver, an output signal generator, and a bias current controller, which are coupled in series between a ground voltage and a high level voltage. The input signal receiver receives the output data signal of the dynamic controller and the output signal generator produces a level-shifted data signal according to the input data signal. The bias current controller controlled by the dynamic voltage is at a first current-output capability when the level-shifted data signal is at a stable stage and at a second current-output capability when the level-shifted data signal is at an unstable stage. The first current-output capability is greater than the second current-output capability. | 01-16-2014 |
20140043313 | GAMMA-VOLTAGE GENERATOR - A gamma-voltage generator is provided to generating a plurality of first gamma voltages and second gamma voltages. At least one of the first gamma voltages generated by DACs of the gamma-voltage generator within a first frame period and at least one of the second gamma voltages generated by the DACs within a second frame period are outputted from a same one of the gamma buffers of the gamma-voltage generator, whereby the transmitted gamma voltages have substantially equal offset. Therefore, the display quality approaches an ideal condition. | 02-13-2014 |
20140133058 | DRIVING CIRCUIT - A driving circuit includes several first electrostatic current limiting resistors and several digital to analog converter (DAC) units. First ends of these first electrostatic current limiting resistors common coupled to a global path to receive a reference voltage. These DAC units respectively coupled to second ends of the first electrostatic current limiting resistors one-on-one to receive the reference voltage through the first electrostatic current limiting resistors. | 05-15-2014 |
20140139270 | PANEL DRIVER IC AND COOLING METHOD THEREOF - A panel driver integrated circuit (IC) and a cooling method of the panel driver IC are provided. The panel driver IC includes a data encoder, a level shifter, a Digital-to-Analog Converter (DAC), a rearrangement circuit and an output buffer. The data encoder receives and selectively changes an original data for outputting to the level shifter. An input terminal and an output terminal of the level shifter are coupled to an output terminal of the data encoder and a data input terminal of the DAC, respectively. The output terminals of the rearrangement circuit are respectively coupled to the reference voltage input terminals of the DAC for providing different reference voltages. The rearrangement circuit correspondingly rearranges the order of the reference voltages according to the operation of the data encoder. An input terminal of the output buffer is coupled to an output terminal of the DAC. | 05-22-2014 |
20140139364 | DRIVING CIRCUIT - A driving circuit includes a plurality of reference voltage lines and a digital to analog converter. The reference voltage lines are configured for respectively transmitting different grayscale reference voltages, in which the grayscale reference voltages are divided into at least two groups, and the wire diameter/wire width of at least one reference voltage line among the reference voltage lines of a first voltage group among the at least two groups is different from the wire diameters/wire widths of the reference voltage lines of a second voltage group among the at least two groups. The digital to analog converter is coupled to the reference voltage lines to receive the grayscale reference voltages and is for converting a digital signal into a grayscale voltage according to the grayscale reference voltages. | 05-22-2014 |
20140210698 | DRIVING METHOD FOR REDUCING EMI AND DEVICE USING THE SAME - A driving method for reducing EMI in a driving device includes detecting a voltage difference between a first display voltage and a second display voltage which correspond to the same pixel, for generating a detecting signal; and adjusting an operating method of a charge sharing switch utilized for performing charge sharing in the driving device according to the detecting signal. | 07-31-2014 |
20140218111 | OPERATIONAL AMPLIFIER CIRCUIT AND METHOD FOR ENHANCING DRIVING CAPACITY THEREOF - An operational amplifier circuit configured to drive a load is provided. The operational amplifier circuit includes an output stage module. The output stage module includes a detection circuit and an output stage circuit. The detection circuit is configured to detect a current output voltage and a previous output voltage based on a comparison result of a current input voltage and the current output voltage. The detection circuit enhances a charge capacity or a discharge capacity of the output stage circuit for the load based on a detection result. Furthermore, a method for enhancing the driving capacity of the operational amplifier circuit is also provided. | 08-07-2014 |
20140368271 | AMPLIFIER CIRCUIT WITH OVERSHOOT SUPPRESSION - An amplifier circuit with overshoot suppress scheme including an input amplifier, an output amplifier, and a diode is provided. A first and a second input ends of the output amplifier are coupled to an output of the input amplifier. The diode is coupled between an output end and the first input end of the output amplifier. When the voltage difference between the output and the input ends of the output amplifier is greater then the barrier voltage of the diode, the diode is turned on, so that the output end of the output amplifier is coupled to the input end of the output amplifier. In the transient state, it rapidly smoothes the overshoot signal. In the steady state, the diode is cut off to maintain the normal operation of the operational amplifier. | 12-18-2014 |
20140375620 | DISPLAY APPARATUS AND SOURCE DRIVER THEREOF - A display apparatus and a source driver thereof are disclosed. The source driver includes a temperature sensor and a power switch. The temperature sensor is configured to measure a first working temperature of the source driver, and generate an over-temperature protection enable signal by comparing the first working temperature with a preset temperature. The power switch is coupled to a power transmission path for a core circuit of the source driver to receive an operating power, and configured to turn on or cut off the power transmission path according to the over-temperature protection enable signal. | 12-25-2014 |