Patent application number | Description | Published |
20090009498 | Capacitive load driving circuit, capacitive load driving method, and driving circuit for liquid crystal display device - The present invention provides a driving circuit capable of exerting improved driving performance while saving power consumption. A capacitive load driving circuit includes a gate driver, which drives scan electrodes aligned in a column direction of capacitive load circuits arranged in a matrix, and a source driver, which drives data electrodes aligned in a row direction of the capacitive load circuits. The source driver includes a plurality of output circuits, which are aligned in the row direction, for driving the respective data electrodes. Each of the plurality of output circuits drives the corresponding data electrode after changing the pre-charge amount on the basis of the position of the scan electrode driven by the gate driver. | 01-08-2009 |
20090021462 | AMPLIFIER OFFSET CANCELING WITHIN DISPLAY PANEL DRIVER - A data driver used for driving a display panel is provided with a grayscale voltage generator circuit generating a plurality of grayscale voltages; and a drive circuitry selecting a selected grayscale voltage from the plurality of grayscale voltages in response to input display data, and outputting a data signal having a voltage level corresponding to the selected grayscale voltage to the display panel. The grayscale voltage generator circuit comprises an amplifier generating a voltage bias; and a voltage generator circuit generating the plurality of grayscale voltages from the voltage bias. The amplifier is designed so that a polarity of an offset voltage of the amplifier is reversible. The polarity of the offset voltage of the amplifier is controlled so that the polarity of the offset voltage of the amplifier used for driving a specific pixel of the display panel in a certain frame period is opposite to that of the offset voltage of the amplifier used for driving the c specific pixel in another frame period. | 01-22-2009 |
20090201237 | Operational amplifier circuit and display apparatus using the same - An operational amplifier circuit includes: an input differential stage circuit supplied with power supply voltages in a first voltage range; and an output stage circuit supplied with power supply voltages in a second voltage range which is different from the first voltage range. The operational amplifier circuit amplifies a signal supplied to the input differential stage circuit and outputs the amplified signal from the output stage circuit to drive a load. | 08-13-2009 |
20090289930 | Operational amplifier circuit and display panel driving apparatus - An operational amplifier circuit includes: an input stage for generating an internal current corresponding to a potential difference between inverting and non-inverting input terminals; and an output stage for driving an output terminal in response to the internal current. The output terminal includes: a floating current source through which the internal current flows; a PMOS transistor for driving the output terminal corresponding to a potential of a first terminal of the floating current source; and an NMOS transistor for driving the output terminal corresponding to a potential of a second terminal of the floating current source. The floating current source includes: a PMOS transistor whose source and drain are respectively connected to the first and second terminals; and an NMOS transistor whose drain and source are respectively connected to the first and second terminals. A back gate of the latter PMOS transistor is connected to the source thereof. | 11-26-2009 |
20090303210 | Display panel driver and display device - Provided is a display panel driver with an improved driving characteristic by use of an amplifier output having excellent symmetry of an output characteristic. The display panel driver according to the present invention includes a first input differential stage circuit, a first output stage circuit, a second output stage circuit, and a first switch circuit. The first input differential stage circuit outputs two first input stage output signals according to one of a positive voltage and a negative voltage. The first switch circuit selects one of the first and second output stage circuits, and connects the selected circuit to the first input differential stage circuit. The output stage circuit connected to the first input differential stage circuit outputs a single-ended signal based on the two first input stage output signals from the first input differential stage circuit. | 12-10-2009 |
20090309857 | Operational amplifter circuit, and driving method of liquid crystal display using the same - A small-offset operational amplifier circuit with a simple circuit architecture is provided. An operational amplifier circuit includes: differential pair sections (MN | 12-17-2009 |
20100007420 | Operational amplifier - An operational amplifier includes an input stage amplifier that receives an input signal, an output stage amplifier that amplifies a signal output from the input stage amplifier and outputs the signal, a capacitor that is connected between an input node and an output node of the output stage amplifier, and a charge and discharge control circuit that controls a charge and discharge current of the capacitor. | 01-14-2010 |
20100033463 | Operational amplifier circuit and display panel driving apparatus - An operational amplifier circuit includes: an input stage for generating an internal current corresponding to a potential difference between inverting and non-inverting input terminals; and an output stage for driving an output terminal in response to the internal current. The output terminal includes: a floating current source through which the internal current flows; a PMOS transistor for driving the output terminal corresponding to a potential of a first terminal of the floating current source; and an NMOS transistor for driving the output terminal corresponding to a potential of a second terminal of the floating current source. The floating current source includes: a PMOS transistor whose source and drain are respectively connected to the first and second terminals; and an NMOS transistor whose drain and source are respectively connected to the first and second terminals. A depletion transistor is used as the latter NMOS transistor. | 02-11-2010 |
20100109774 | Operational amplifier - An operational amplifier includes an input stage amplifier that receives an input signal, an output stage amplifier that amplifies a signal output from the input stage amplifier and outputs the signal, a capacitor that is connected between an input node and an output node of the output stage amplifier, and a charge and discharge control circuit that controls a charge and discharge current of the capacitor. | 05-06-2010 |
20100265273 | Operational amplifier, driver and display - An operational amplifier includes an input differential stage having one external input receiving an external input voltage and two outputs; and two output stages. A switch section is provided between inputs of the two output stages and the two outputs of the input differential stage, and is configured to alternately connect the two outputs of the input differential stage and inputs of a positive-only output stage of the two output stages; and the two outputs of the input differential stage and inputs of a negative-only output stage of the two output stages. | 10-21-2010 |
20100271129 | Output circuit using analog amplifier - An output circuit includes an analog amplifier circuit including a differential amplifier stage configured to receive an input voltage, and first to n | 10-28-2010 |
20100271364 | Display panel driver - A display panel driver is provided with: first and second amplifiers; first to n-th even output nodes, n being an integer of two or more; first to n-th odd output nodes; first and second output pads connected to data lines of a display panel, respectively; first to n-th switch blocks; first to n-th even electrostatic protection resistors; and first to n-th odd electrostatic protection resistors. The i-th switch block out of the first to n-th switch blocks is configured to switch connections between the first and second amplifiers and i-th even and odd electrostatic protection resistors out of the first to n-th even and odd electrostatic protection resistors. The first to n-th even electrostatic protection resistors are connected between the first to n-th even output nodes and the first output pad, respectively. The first to n-th odd electrostatic protection resistors are connected between the first to n-th odd output nodes and the second output pad, respectively. | 10-28-2010 |
20110025654 | DIFFERENTIAL AMPLIFIER CIRCUIT, DATA LINE DRIVER USING THE SAME, AND LIQUID CRYSTAL DISPLAY APPARATUS - A differential amplifier circuit includes: an | 02-03-2011 |
20110025655 | OPERATIONAL AMPLIFIER AND SEMICONDUCTOR DEVICE USING THE SAME - An operational amplifier is provide with: a first MOS transistor pair connected to a non-inverting input terminal and an inverting input terminal; an intermediate stage connected to the first MOS transistor pair connected to the first MOS transistor pair; a first output transistor having a drain connected to an output terminal; and a first source follower. The first source follower is inserted between a gate of the first output transistor and a first output node of the intermediate stage. | 02-03-2011 |
20110032233 | LCD DRIVING CIRCUIT USING OPERATIONAL AMPLIFIER AND LCD DISPLAY APPARATUS USING THE SAME - In an operational amplifier includes: a control unit switches an operation mode between first and second operation modes. A first differential stage circuit section differentially-amplifies a first input signal supplied through a first input node in the first operation mode, and a second input signal supplied through the first input node in the second operation mode, similar to a second differential stage circuit section. A first output drive stage circuit section is configured to amplify the first input signal differentially-amplified by the first or second input differential stage circuit section to output as a first drive voltage, similar to a second output drive stage circuit section. First and second power supplies supply voltages in a first voltage range to the first differential stage circuit section and the first output drive stage circuit section in the first operation mode, and to supply voltages in the first voltage range to the second differential stage circuit section and the first output drive stage circuit section in the second operation mode, similar to third and fourth power supplies. The drive voltage on each of the first and second output nodes is fed back. | 02-10-2011 |
20110205193 | Operational amplifier with decreased through current, and display panel driver and display device incorporating the same - An operational amplifier is provided with: a high-side output transistor connected between an output terminal and a positive power supply line; a low-side output transistor connected between the output terminal and a negative power supply line; a first capacitor element connected between a first node and the output terminal; a second capacitor element connected between a second node and the output terminal; a first PMOS transistor having a source connected to the gate of the high-side output transistor and a drain connected to the gate of the low-side output transistor; a first NMOS transistor having a source connected to the gate of the low-side output transistor and a drain connected to the gate of the high-side output transistor; a second PMOS transistor having a source connected to the first node and a drain connected to the gate of the high-side output transistor; and a second NMOS transistor having a source connected to the second node and a drain connected to the gate of the low-side output transistor. The gates of the first and second PMOS transistors are commonly connected and fed with a first bias voltage, and the gates of the first and second NMOS transistors are commonly connected and fed with a second bias voltage. | 08-25-2011 |
20110242145 | DISPLAY DEVICE, DIFFERENTIAL AMPLIFIER, AND DATA LINE DRIVE METHOD FOR DISPLAY DEVICE - A display device is provided with a plurality of differential amplifiers associated with a plurality of data lines within a display panel. Each of the plurality of differential amplifiers includes: an output stage circuit including a first transistor having a source connected to the positive power supply and a second transistor having a source connected to the negative power supply, an output terminal connected to drains of the first and second transistors; and a bias control circuit provided between the adder circuit and the output stage circuit to achieve bias control of gates of the first and second transistors. During the switching period, the output stage circuit provides short-circuiting between the gate and source of each of the first and second transistors, and the bias control circuit cuts off a current path between the gates of the first and second transistors during the switching period. | 10-06-2011 |
20120188214 | TRANSMITTER CIRCUIT, TRANSMISSION CIRCUIT AND DRIVER UNIT - A transmitter circuit includes a driver circuit including a non-inverting output terminal and an inverting output terminal for outputting a signal current, which has a loop direction that changes based upon an input signal, to the non-inverting output terminal and the inverting output terminal and an output-waveform control circuit for detecting a waveform edge of the input signal and responding by increasing the signal current temporarily. The output-waveform control circuit includes a first inverter circuit receiving a non-inverted input signal, a first capacitor including one end connected to an output terminal of the first inverter circuit and another end connected to the inverting output terminal, a second inverter circuit receiving an inverted input signal, and a second capacitor including one end connected to an output terminal of the second inverter circuit and another end connected to the non-inverting output terminal. | 07-26-2012 |
20130002636 | LCD DRIVING CIRCUIT USING OPERATIONAL AMPLIFIER AND LCD DISPLAY APPARATUS USING THE SAME - In an operational amplifier, a control unit switches an operation mode between first and second operation modes. A first output drive stage circuit section is configured to amplify a first input signal differentially-amplified by a first or a second input differential stage circuit section to output as a first drive voltage, similar to a second output drive stage circuit section. First and second power supplies: supply voltages in a first voltage range to the first differential stage circuit section and the first output drive stage circuit section in the first operation mode, supply voltages in the first voltage range to the second differential stage circuit section and the first output drive stage circuit section in the second operation mode, similar to third and fourth power supplies. The drive voltage on each of the first and second output nodes is fed back. | 01-03-2013 |