Patent application number | Description | Published |
20080284493 | Proportional to absolute temperature current generation circuit having higher temperature coefficient, display device including the same, and method thereof - A proportional to absolute temperature (PTAT) current generation circuit may include a current mirror unit and/or a level control unit. The current mirror unit may be connected between a first power supply voltage, a first node, and/or a second node. The level control unit may be connected between the first node, the second node, and/or a second power supply voltage. The level control unit may be configured to control a level of an output current of the current mirror unit based on a voltage level of the first node and a voltage level of the second node. The level control unit may include a first transistor connected between the first node and the second power supply voltage, at least one second transistor connected between the second node and a third node, the at least one second transistor configured to operate in a weak inversion region, and/or a third transistor connected between the third node and the second power supply voltage. | 11-20-2008 |
20090109198 | BUFFER AMPLIFIER INCLUDED IN DISPLAY DRIVER AND METHOD OF GENERATING DRIVING VOLTAGES USING THE SAME - A method of generating a driving voltage includes inputting a test gradation voltage to a first input terminal and a second input terminal of a buffer, latching the logic level of a test driving voltage output from an output terminal of the buffer, setting the buffer to a first type when the logic level of the test driving voltage is high level and setting the buffer to a second type when the logic level of the test driving voltage is low level, and operating the buffer set to the first type or the second type to generate a driving voltage corresponding to a gradation voltage. | 04-30-2009 |
20100002019 | DIGITAL TO ANALOG CONVERTER, SOURCE DRIVER AND LIQUID CRYSTAL DISPLAY DEVICE INCLUDING THE SAME - A digital to analog converter includes a first decoder, a gamma reference voltage decoder unit and an active resistor string unit. The first decoder receives 2 | 01-07-2010 |
20130120334 | DISPLAY DRIVING DEVICE AND DISPLAY SYSTEM WITH IMPROVED PROTECTION AGAINST ELECTROSTATIC DISCHARGE - A display driving device a driving unit, an output unit, and an output control unit. The driving unit includes a first buffer and a second buffer generating a first driving voltage and a second driving voltage, respectively. The output unit includes a first output pad and a second output pad to which voltages are respectively applied via first second data driving paths, respectively, and which output the voltages to outside. The output control unit includes a charge share path that connects the first output pad and the second output pad. Each of the first data driving path and the second data driving path includes a first electro-static discharge (ESD) protection element, and the charge share path includes a second ESD protection element that is disposed separately from the first data driving path and the second data driving path. | 05-16-2013 |
20130249635 | AMPLIFIER FOR OUTPUT BUFFER AND SIGNAL PROCESSING APPARATUS USING THE SAME - An amplifier for an output buffer includes an operational amplifier including a first input terminal, a second input terminal, and an output terminal, the operational amplifier is configured to generate an input bias current and amplify a voltage difference between signals applied to the first input terminal and the second input terminal, and to output the amplified voltage difference; and a self-bias circuit connected to the first input terminal and the second input terminal, the self-bias circuit is configured to generate first and second current paths when the voltage difference is equal to or greater than a predetermined voltage, to generate a tail current on the first or second current path, and to add the generated tail current to the input bias current of the operational amplifier, wherein the second input terminal is connected to the output terminal. | 09-26-2013 |
20130334985 | OUTPUT BUFFER CIRCUIT, DEVICES INCLUDING THE SAME, AND OPERATING METHOD OF THE OUTPUT BUFFER CIRCUIT - An output buffer circuit includes an amplifier and a transmission circuit. The amplifier includes a plurality of inputs and an output. The inputs provide first input signals and second input signals to the amplifier. The output provides an output signal as a first input signal of the first input signals to the amplifier. The transmission circuit has an input coupled to the output of the amplifier and further has an output that provides a transmission circuit output signal as a second input signal of the second input signals to the amplifier. | 12-19-2013 |
20140240208 | VOLTAGE LEVEL CONVERSION CIRCUITS AND DISPLAY DEVICES INCLUDING THE SAME - A voltage level conversion circuit includes a voltage switch circuit and a level shift circuit. The voltage switch circuit is configured to sequentially output an intermediate voltage and a conversion voltage in response to a switch signal. The level shift circuit is configured to latch a voltage level corresponding to an input signal using the intermediate voltage, and to convert the latched voltage level using the conversion voltage to generate an output signal. | 08-28-2014 |
20150194086 | SOURCE DRIVING CIRCUIT CAPABLE OF COMPENSATING FOR AMPLIFIER OFFSET, AND DISPLAY DEVICE INCLUDING THE SAME - A display device capable of decreasing an amplifier offset using a gate-start pulse signal is disclosed. A display device includes a display panel, a control circuit, a gate driving circuit and a source driving circuit. The source driving circuit includes a plurality of source driving chips, compensates for an amplifier offset in response to the gate-start pulse signal, performs digital-to-analog (D/A) conversion on data received from the control circuit using gray scale voltages in response to the source control signal, and provides the converted data to the source lines. | 07-09-2015 |