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Hyoung-Rae
Hyoung-Rae Kim, Hwseong-Si KR
| Patent application number | Description | Published |
|---|---|---|
| 20100156867 | DIGITAL-TO-ANALOG CONVERTER, SOURCE DRIVING CIRCUIT AND DISPLAY DEVICE HAVING THE SAME - A digital-to-analog converter includes a voltage-to-current converter, a current-mode digital-to-analog converter and an operational amplifier. The voltage-to-current converter generates a first current signal, and the current-mode digital-to-analog converter generates a second current signal. The operational amplifier modulates a drain current in response to the second current signal and generates an output signal having an offset. | 06-24-2010 |
Hyoung-Rae Kim, Gyeonggi-Do KR
| Patent application number | Description | Published |
|---|---|---|
| 20090237386 | Display driver integrated circuit using ping-pong type sample and hold circuit - A display driver integrated circuit using a ping-pong type sample and hold circuit is provided. The display driver integrated circuit includes a data counter, a comparison unit, a gray voltage generation unit, and a sample and hold circuit. The data counter outputs first through n-th gamma data in response to a clock signal. The comparison unit compares input image data with each of the first through n-th gamma data so as to output a comparison signal. The gray voltage generation unit generates first through n-th gray voltages in response to the first through n-th gamma data. The sample and hold circuit includes a first sub sample and hold circuit and a second sub sample and hold circuit and outputs one of the first through n-th gray voltages in response to the comparison signal. While the first sub sample and hold circuit is performing sampling, the second sub sample and hold circuit outputs one of the first through n-th gray voltages, or alternatively, while the second sub sample and hold circuit is performing sampling, the first sub sample and hold circuit outputs one of the first through n-th gray voltages. | 09-24-2009 |
| 20090315610 | Integrated Circuit Devices Having Level Shifting Circuits Therein - Level shifting circuits generate multiple tracking signals that are in-phase with an input signal, but are also level-shifted with wider voltage swings relative to the input signal. These input tracking signals are provided as separate inputs to an inverter having at least one PMOS pull-up transistor and at least one NMOS pull-down transistor therein. A level shifting circuit may include a differential input circuit, which is responsive to true and complementary input signals. A first load circuit is electrically coupled to the differential input circuit. This first load circuit is configured to generate first and second tracking signals at respective first and second nodes therein. These first and second tracking signals are in-phase, level-shifted versions of each other, and have respective voltage swings that are greater than a voltage swing of the complementary input signals. The inverter includes a pull-up transistor responsive to the first tracking signal and a pull-down transistor responsive to the second tracking signal. | 12-24-2009 |
Hyoung-Rae Lee, Cheonan-Si-Do KR
| Patent application number | Description | Published |
|---|---|---|
| 20090040156 | DISPLAY DEVICE AND METHOD FOR DRIVING THE SAME - A display device and a method for driving the same, in which the display device includes a storage unit for storing a plurality of reference gradation code data corresponding to a plurality of gradations, and some of variable gradation code data corresponding to some of the gradation points of the plurality of gradations; a signal controller for converting gradations of original pixel data into gradation code signals of different levels using the plurality of reference gradation code data or both the plurality of reference gradation code data and the some variable gradation code data according to an operation mode; a data driver for converting the gradation code signal into an analog pixel data signal; and an image display unit for displaying an image according to the pixel data signal. The original pixel data are converted into gradation code signals of different levels according to an image display mode, thereby preventing luminance degradation and flicker generation due to the image display mode. Only the reference gradation code data and some of the variable gradation code data are stored in the memory to thereby reduce the amount of data stored in the memory, so that manufacturing costs of display devices caused by additional memories can be reduced. | 02-12-2009 |
Hyoung-Rae Lee, Chungcheongnam-Do KR
| Patent application number | Description | Published |
|---|---|---|
| 20110242140 | METHOD OF DRIVING COLUMN INVERSION DISPLAY PANEL AND DISPLAY APPARATUS FOR PERFORMING THE SAME - In a method of driving a display panel, a gate signal is outputted to the display panel based on a first control signal. A gamma-corrected analog voltage is generated. A pre-charge compensating analog voltage is generated. A data voltage waveform is generated to include the generated gamma-corrected analog voltage and the generated pre-charge compensating analog voltage during one horizontal period of the display panel. The display panel has a pixel structure in which a data line is alternately connected to first and second subpixel columns adjacent to each other. The pre-charge compensating voltage has a level different from that of the gamma-corrected analog voltage where the latter represents a grayscale level represented by a received digital data signal. According to the method, display defects due to a difference of pre-charging levels used during plural horizontal periods may be decreased so that display quality of the display panel may be improved. | 10-06-2011 |