| Patent application number | Description | Published |
|---|
| 20090051677 | SUPPLY VOLTAGE REMOVAL DETECTING CIRCUIT, DISPLAY DEVICE AND METHOD FOR REMOVING LATENT IMAGE - A supply voltage removal detecting circuit, a display device and method for removing a latent image when a supply voltage is disconnected, in which the supply voltage removal detecting circuit includes a voltage controller, a detection signal generator, and an output unit. The voltage controller controls voltages such that when a first supply voltage and a second supply voltage stay at a first level, the voltage at a first node is greater than the voltage at a second node, and when the first supply voltage or the second supply voltage becomes a second level, the voltage at the second node stays at a specific level, and the voltage at the first node is less than the specific level. The detection signal generator generates a detection signal by comparing the voltage at the first node with the voltage at the second node. The output unit prevents the voltage controller and the detection signal generator from faulty operations, and inverts the detection signal in response to an operation enabling signal to output a detection control signal. | 02-26-2009 |
| 20090096731 | Method and apparatus for generating gradation voltage for X-axis symmetric gamma inversion - A method and apparatus for generating gradation voltages are provided. Maximum and minimum reference voltages are selected from a distribution of voltages ranging from a first source voltage to a second source voltage. The maximum reference voltage is selected as a 1 | 04-16-2009 |
| 20090295770 | LEVEL SHIFTER USING LATCH CIRCUIT AND DRIVING CIRCUIT INCLUDING THE SAME IN DISPLAY DEVICE - A level shifter includes a switching unit, a power supply circuit, and a latch circuit. The switching unit selectively outputs an input signal to a first output terminal in response to a first control signal. The power supply circuit generates a variable voltage, which changes when level shifting is performed, in response to a plurality of second control signals. The latch circuit performs the level shifting in response to the input signal selectively output by the switching unit and the variable voltage. Since the level shifter can perform level shifting using the latch circuit, it can be made in compact size and it operates with low power. Also, the level shifter sets the transition periods of the first control signal and the variable voltage not to overlap each other, thereby decreasing signal distortion. | 12-03-2009 |
| 20100053125 | DISPLAY DRIVER INTEGRATED CIRCUIT APPARATUS AND METHOD OF OPERATING THE SAME - A display driver integrated circuit (IC) apparatus having an improved data transmission characteristic, an electronic apparatus having the same, and a method of operating the same. The display driver IC apparatus includes a memory unit to store data, a logic circuit unit to perform data processing of a plurality of pieces of data that are read by the memory unit through a plurality of data lines, and a switching unit disposed on the plurality of data lines between the memory unit and the logic circuit and comprising transmission gates corresponding to the plurality of data lines, so as to control transmission of the plurality of pieces of data that are read by the memory. | 03-04-2010 |
| 20100079505 | Source line driver circuit and display apparatus including the same - A source line driver circuit and a display apparatus including the same are provided. The source line driver circuit includes a logic block configured to receive serialized image data, to change the number of bits of the image data, and to output image data having the changed number of bits, and a source channel driver unit configured to receive the image data having the changed number of bits and to provide at least one analog voltage corresponding to the received image data to source lines. Accordingly, the number of necessary switches may be reduced, and therefore, the required area and/or current consumption may also be reduced. | 04-01-2010 |
| 20100134514 | Data Driver and Liquid Crystal Display Device Including the Same - A data driver for driving a liquid crystal display (LCD) device includes a common grayscale voltage generator configured to output a plurality of common grayscale voltages, a data processing unit configured to expand externally input image data to provide expanded image data and to adjust an offset of the expanded image data to output data offset adjusted image data, and a data signal output unit configured to output as data signals a first grayscale voltage corresponding to the expanded image data and a second grayscale voltage corresponding to the data offset adjusted image data among the plurality of common grayscale voltages. | 06-03-2010 |
| 20100225678 | DISPLAY DRIVER CIRCUIT - A display driver circuit configured to be shared by three grey-scale voltage generators to be respectively used with red (R), green (G) and blue (B) colors. In particular, two of the three grey-scale voltage generators share first and second resistor strings, gamma voltage selectors, and gamma adjustment buffers provided in the other grey-scale voltage generator, thereby reducing the size and power consumption of the display driver circuit. Also, when only a single grey-scale voltage is output, it is possible to deactivate the grey-scale voltages provided by two of the grey-scale generators and further reduce power consumption. | 09-09-2010 |
| 20110037750 | DISPLAY DEVICE AND DRIVING CIRCUIT THEREOF - A driving circuit of a display device is provided. The driving circuit applies a first external voltage to a source line of a display panel before a source driving voltage is applied to the source line and applies at least one second external voltage to a common electrode of the display panel before one between a first common voltage and a second common voltage is applied to the common electrode, thereby reducing the driving power of the display device. | 02-17-2011 |
