Patent application number | Description | Published |
20090212832 | LOAD CAPACITY DRIVING CIRCUIT - The present invention provides a load capacity driving circuit that is inexpensive and has a high driving capability. When an input signal changes to low potential, gate voltage of an output stage of an amplifying circuit increases, an NMOS transistor MNO turns on, and an NMOS transistor MN | 08-27-2009 |
20090219276 | DRIVING DEVICE AND DRIVING METHOD FOR IMAGE DISPLAY DEVICE - A display driving device and method capable of canceling an offset voltage while suppressing a delay in outputting an image signal to the display device by the time required for the image signal to be completely received in the display device. In an exemplary embodiment, when an image signal is input to an operational amplifier, a pixel of the display device, to which a voltage based on the image signal is applied, and an output terminal of the operational amplifier are connected to each other. The image signal is input to the operational amplifier, and, when charges corresponding to an offset voltage generated in the operational amplifier have accumulated in a capacitor, the image signal is input to the operational amplifier together with the charges accumulated in the capacitor while the connection between the pixel and the output terminal of the operational amplifier is maintained. | 09-03-2009 |
20100123705 | OPERATIONAL AMPLIFIER AND DISPLAY PANEL DRIVING DEVICE - An operational amplifier includes an output circuit and a differential circuit. The output circuit outputs a voltage in a voltage range determined either from a highest voltage that is an upper limit of a predetermined power source range, or from a lowest voltage that is a lower limit of the predetermined power source range, to an intermediate voltage that is a voltage between the highest voltage and the lowest voltage. The differential circuit includes a first MOS transistor to which a driving signal for driving a display panel is input and a second MOS transistor to which a given input signal is input. The first MOS transistor and the second MOS transistor are connected in parallel, and a differential input-permissible-range of the differential circuit is wider than the voltage range of the output circuit. | 05-20-2010 |
20100214277 | OUTPUT CIRCUIT AND DRIVING CIRCUIT FOR DISPLAY DEVICE - The present invention provides an output circuit that can suppress a voltage drop in an output section of the output circuit and that can suppress a phase delay of an output signal which is feedbacked to an input section of the output circuit. An AC component of a data signal output from an output terminal of an operational amplifier to which an input signal is input, is negatively feedbacked via a capacitor, and is input to an inverting input terminal of the operational amplifier. A DC component of the data signal output from the output terminal, is lowered its potential by a second protective resistor to the same potential as the input signal and is output as an output signal to data lines via respective output pads, and is output to an inverting input terminal of the operational amplifier via a first protective resistor. | 08-26-2010 |
20110157120 | DRIVE CIRCUIT AND DISPLAY DEVICE - A drive circuit for driving a display panel includes a first operation amplifier for operating using a first power source voltage and a second power source voltage; a second operation amplifier for operating using a third power source voltage and a fourth power source voltage; a control unit for supplying a first control voltage and a second control voltage; and a switch circuit for switching the first operation amplifier and the second operation amplifier. The switch circuit includes an n-channel type field effect transistor. The control unit applies the first control voltage to the n-channel type field effect transistor, so that the n-channel type field effect transistor transits from a non-conductive state to a conductive state. | 06-30-2011 |
20120001952 | DRIVING CIRCUIT AND DISPLAY APPARATUS - A driving circuit includes a pair of operational amplifiers, one producing an analog voltage output of positive polarity, the other producing an analog voltage output of negative polarity. An output switching circuit interchanges these outputs between a pair of data lines. One or both of the operational amplifiers includes a parasitic diode having one terminal connected to the output terminal of the operational amplifier and another terminal normally connected to a power supply voltage of the operational amplifier. When the output of the operational amplifier is switched, a protective switching circuit temporarily disconnects the parasitic diode from the power supply of the operational amplifier and instead connects it to a power supply line carrying a voltage high enough, or low enough, to ensure that the parasitic diode is not forward biased by the existing voltage on the data line to which the output is switched. | 01-05-2012 |
20120242722 | DISPLAY PANEL DRIVE DEVICE, SEMICONDUCTOR INTEGRATED DEVICE, AND IMAGE DATA ACQUISITION METHOD IN DISPLAY PANEL DRIVE DEVICE - A display panel drive device for applying a drive pulse to data lines of a display panel according to a video signal includes a latch portion and an output amplifier. The latch portion includes a first latch section, a delay circuit, and a second latch section. The first latch section is provided for capturing the pixel data pieces or retaining the pixel data pieces. The delay circuit is provided for generating a delayed load clock signal. The second latch section is provided for capturing the pixel data pieces or retaining the pixel data pieces. The delayed load clock signal is transited to the first level state after a first delay time, and the delayed load clock signal is transited to the second level state after a second delay time shorter than the first delay time. | 09-27-2012 |
20130020673 | PROTECTION DIODE AND SEMICONDUCTOR DEVICE HAVING THE SAME - A protection diode includes a semiconductor substrate having a first region, a second region surrounding the first region, and a third region surrounding the second region; a first insulation layer disposed between the second region and the third region; a first conductive type semiconductor portion disposed in the third region; a second conductive type semiconductor portion disposed in the second region; and a capacity reduction layer disposed in the first region. | 01-24-2013 |
20140043221 | DEVICE CIRCUIT AND DISPLAY APPARATUS HAVING OPERATIONAL AMPLIFIERS WITH PARASITIC DIODES - A driving circuit includes a pair of operational amplifiers, one producing an analog voltage output of positive polarity, the other producing an analog voltage output of negative polarity. An output switching circuit interchanges these outputs between a pair of data lines. One or both of the operational amplifiers includes a parasitic diode having one terminal connected to the output terminal of the operational amplifier and another terminal normally connected to a power supply voltage of the operational amplifier. When the output of the operational amplifier is switched, a protective switching circuit temporarily disconnects the parasitic diode from the power supply of the operational amplifier and instead connects it to a power supply line carrying a voltage high enough, or low enough, to ensure that the parasitic diode is not forward biased by the existing voltage on the data line to which the output is switched. | 02-13-2014 |