Patent application number | Description | Published |
20110175943 | Gamma Voltage Output Circuit of Source Driver - A gamma voltage output circuit of a source driver includes a reference voltage generation unit configured to generate upper and lower reference voltages; and upper and lower gamma buffers configured to stabilize and output the reference voltages. The lower gamma buffers include a first gamma buffer having a first operational amplifier which operates as a rail amplifier in a region between a positive power supply voltage and a ground voltage to receive a first lower reference voltage of a positive voltage region and output a first gamma voltage of the positive voltage region, and the upper gamma buffers include a second gamma buffer having a second operational amplifier which operates as a rail amplifier in a region between the ground voltage and a negative power supply voltage to receive a first upper reference voltage of a negative voltage region and output a second gamma voltage of the negative voltage region. | 07-21-2011 |
20110273433 | BOOST CONVERTER FOR LIQUID CRYSTAL DISPLAY - In order that a boost converter of an LDI can reduce electromagnetic interference by generating a panel driving voltage through the use of a variable frequency, while achieving a stable boosting operation using the same frequency whenever each frame begins, an oscillator generates an oscillation signal having a frequency, which varies in a predetermined pattern or hops in a random pattern around a center frequency, and generates an oscillation signal having a preset fixed frequency whenever each frame begins. | 11-10-2011 |
20120044227 | POWER SUPPLY CIRCUIT FOR LIQUID CRYSTAL DISPLAY DEVICE - A power supply circuit of a liquid crystal display device includes a first positive polarity charge charging unit including a first capacitor connected to positive and negative power terminals through switches to charge a charge, a second positive polarity charge charging unit including a second capacitor connected to the positive power terminal and a ground terminal through switches to charge a charge, a first positive polarity charge loading unit loading the charge supplied through the positive power terminal to a negative polarity terminal, a second positive polarity charge loading unit loading the charge charged in the first capacitor to a negative polarity terminal, a third positive polarity charge loading unit loading the charge charged in the second capacitor, and a positive polarity charge charging/loading control unit outputting charging control signals with a same phase to the switches, and periodically or irregularly changing durations of the charging and loading control signals. | 02-23-2012 |
20130300690 | CONTROL CIRCUIT OF TOUCH SCREEN AND NOISE REMOVING METHOD - The present invention discloses a control circuit of a touch screen and a noise removing method. The present invention provides a technique for performing differential sensing on two adjacent detection lines of a touch screen panel and integrating a differential sensing signal to filter noise. The control circuit and the noise removing method may remove display noise having an effect on two adjacent detection lines, three-wavelength lamp noise having a predetermined frequency, 60 Hz noise, and charger noise caused by battery charging. | 11-14-2013 |
20130300692 | SIGNAL PROCESSING CIRCUIT AND SIGNAL PROCESSING SYSTEM OF TOUCH SCREEN - The present invention discloses a signal processing circuit and a signal processing system for processing an input signal provided from a touch screen in response to a driving signal. | 11-14-2013 |
20150042546 | GAMMA VOLTAGE GENERATION CIRCUIT OF SOURCE DRIVER - The present invention relates to a technology for outputting a gamma voltage in a source driver of a display device. A gamma voltage generation circuit of a source driver in accordance with the present invention may form wide high and low gamma voltage ranges even when a negative power supply voltage and a positive power supply voltage are asymmetrical to each other. | 02-12-2015 |
20150138115 | SIGNAL PROCESSING CIRCUIT FOR TOUCH SCREEN AND METHOD FOR CONTROLLING THE SAME - The present disclosure relates to a signal processing circuit for a touch screen, which is capable of processing a sensing signal outputted from a touch screen panel, and a method for controlling the same. When pulses containing noise exist in the sensing signal, the signal processing circuit compensates for an integral signal in response to the pulses containing noise. | 05-21-2015 |