Abstract: An overcurrent protective system includes a current detector which detects a current flowing in an element which is to be protected by the overcurrent protective system, an overcurrent counting unit which selects an overcurrent sensing level corresponding to the element among a plurality of overcurrent sensing levels which are threshold values becoming standards for determining whether the current detected by the current detector is a normal current or an overcurrent and which determines whether the current is the overcurrent or not by comparing the current with the selected overcurrent sensing level, and a controller which decreases an output voltage of a circuit which is to be protected by the overcurrent protective system and includes the element when the current flowing in the element is determined as the overcurrent.

Abstract: A method of method of protecting a gate driver circuit configured to provide a gate line of a display panel with a gate signal includes generating a clock signal to drive the gate driver circuit, sensing an output current of the clock signal, detecting an overcurrent of the clock signal based on an overcurrent determining factor, determining whether the clock signal is in an overcurrent condition based on a count number of the overcurrent, generating a shutdown signal when the clock signal is in the overcurrent condition and blocking the clock signal from being applied to the gate driver circuit based on the shutdown signal.

Abstract: A display device includes: a display panel including a plurality of pixels; a driving circuit configured to control the plurality of pixels; and a power controller configured to apply an output voltage to the driving circuit and to receive a feedback signal indicating an input level of the output voltage applied at an input of the driving circuit. The power controller is configured to adjust an output level of the output voltage in response to the feedback signal.

Abstract: A DC-DC converter includes a power switch and a switching controller. The power switch is repetitively turned on and off for generating an output DC voltage based on an input DC voltage. The switching controller controls operation of the power switch, and includes a slew rate controller to adjust a slew rate of a switch voltage of an electrode of the power switch to vary with time.

Abstract: A display apparatus including: a plurality of pixels receiving data voltages in response to gate signals; a drive circuit generating a power voltage and a control signal; a gate driver operating with the power voltage, generating the gate signals and a dummy gate signal in response to the control signal, and supplying the dummy gate signal to the drive circuit; and a data driver operating with the power voltage and generating the data voltages in response to the control signal. The drive circuit measures a temperature of the drive circuit, and a voltage and a current at an output node of the drive circuit generating the power voltage. The measured temperature, voltage and current, and the dummy gate signal are stored in the drive circuit in a predetermined order. This information can be used to detect error states that the display can indicate and use to protect itself from damage.

Abstract: A polarization switching device includes a lower panel; an upper panel facing the lower panel; a liquid crystal layer disposed between the lower panel and the upper panel; and a driver to apply a first driving voltage and a second driving voltage to the lower panel and the upper panel, respectively, the first driving voltage to transition among a center voltage, a first voltage and a second voltage. The first voltage and the second voltage have the same difference in value from the center voltage. The driver includes a voltage changing unit to generate the first voltage and the second voltage based on a digital data input to a first digital-analog converter.

Abstract: A liquid crystal display includes a plurality of pixels arranged in a matrix, each pixel having a first sub-pixel electrode and a second sub-pixel electrode. A first thin film transistor is connected to the first sub-pixel electrode. A second thin film transistor is connected to the second sub-pixel electrode. A third thin film transistor is connected to the second sub-pixel electrode. A fourth thin film transistor is connected to a drain electrode of the third thin film transistor. A first gate line is connected to the first thin film transistor and the second thin film transistor. A data line is connected to the first thin film transistor and the second thin film transistor. A second gate line is connected to the third thin film transistor. A third gate line is connected to the fourth thin film transistor.

Abstract: A display device including a voltage generator is disclosed. The voltage generator includes an analog driving voltage generator to convert a source voltage from an external source to an analog driving voltage and to output the analog driving voltage through an output terminal, a capacitor connected between the output terminal and a ground voltage node, and a discharge circuit connected between the output terminal and the ground voltage node to discharge a current at the output terminal in response to a blank synchronization signal.

Abstract: A method of method of protecting a gate driver circuit configured to provide a gate line of a display panel with a gate signal includes generating a clock signal to drive the gate driver circuit, sensing an output current of the clock signal, detecting an overcurrent of the clock signal based on an overcurrent determining factor, determining whether the clock signal is in an overcurrent condition based on a count number of the overcurrent, generating a shutdown signal when the clock signal is in the overcurrent condition and blocking the clock signal from being applied to the gate driver circuit based on the shutdown signal.

Abstract: A driving voltage generating device, a display device including the same, and a method of generating a driving voltage are provided. The driving voltage generating device includes a driving voltage setting unit receiving initially set data on a driving voltage and a feedback voltage and outputting a control signal, a driving voltage trimmer receiving finely adjusted data on the driving voltage and adjusting the feedback voltage, and a DC to DC converter generating the driving voltage based on the control signal and an input voltage.

Abstract: A gate-off voltage generator provides a gate-off voltage to a gate line of a display panel. The gate-off voltage generator includes a transistor having a base terminal, a collector terminal, and an emitter terminal, the emitter terminal configured to output the gate-off voltage to the gate line. A controller is connected to the base terminal. A feedback circuit is connected between the gate line and the controller, the feedback circuit configured to provide to the controller a feedback voltage based upon the gate-off voltage outputted from the emitter terminal. The gate-off voltage from the emitter terminal is compared with a desired gate-off voltage in the controller and the voltage at the base terminal is controlled by the controller to provide the desired gate-off voltage to gate line.

Abstract: Provided is a display device, including: a plurality of pixels; a scan driver connected to a plurality of scanning lines connected to the plurality of pixels; and a gate signal generator configured to determine a level of a gate-on voltage according to ambient temperature and to supply the gate-on voltage to the scan driver, wherein the gate signal generator is further configured to apply a hysteresis characteristic to a thermistor voltage to vary according to the ambient temperature.

Abstract: A power source circuit includes an inductor, a reservoir capacitor, and a switching control part that generates ON/OFF control signals to each of first and second switches. The first switch is connected between a first power voltage terminal and a first node to form a first current path between the first power voltage terminal and the first node in response to a driving signal of the switching control part. The second switch is connected between the first node and a second power voltage terminal to form a second current path between the first node and the second power voltage terminal in response to the driving signal. The inductor is connected to the first node to provide an average voltage between the first power voltage terminal and the second power voltage terminal. The capacitor is connected in parallel with the inductor to store the average voltage.

Abstract: Exemplary embodiments of present invention relate to an error detecting apparatus for a gate driver improving a reliability of a display apparatus, a display apparatus having the error detecting apparatus, and a method of detecting an error of the gate driver using the error detecting apparatus. An exemplary embodiment discloses an error detecting apparatus including an error detecting part configured to receive a gate signal of a gate driver and determine whether a status of the gate driver is in a normal status or an error status based on the gate signal, a memory configured to store the status of the gate driver, and a signal outputting part configured to selectively output a clock signal and an error signal based on the status of the gate driver stored in the memory.

Abstract: A power source circuit of a display apparatus includes a voltage divider, an operational amplifier, a first switch, a second switch, and a protector. The voltage divider generates a divided voltage between a first driving voltage and a ground voltage. The operational amplifier receives the divided voltage and outputs the divided voltage as a second driving voltage. The first switch is connected between a first supply voltage terminal to receive the first driving voltage and a common node. The second switch is connected between the common node and a second supply voltage terminal to receive the ground voltage. The protector is connected to the common node to limit a voltage output of the first supply voltage terminal in response to a voltage of the common node.

Abstract: A driving device of a display device includes: a reference voltage generator configured to receive a high potential power supply voltage, a low potential power supply voltage and a medium power supply voltage and to generate reference voltages between the high potential power supply voltage and the low potential power supply voltage, where the low potential power supply voltage is lower than the high potential power supply voltage, and the medium power supply voltage has a value between the high potential power supply voltage and the low potential power supply voltage; a gray reference voltage generator configured to receive and divide the reference voltages and to generate gray reference voltages; and a data driver configured to receive the gray reference voltages and the high and medium potential power supply voltages, and to generate data voltages using the gray reference voltages and the high and medium potential power supply voltages.

Abstract: A display device including a voltage generator is disclosed. The voltage generator includes an analog driving voltage generator to convert a source voltage from an external source to an analog driving voltage and to output the analog driving voltage through an output terminal, a capacitor connected between the output terminal and a ground voltage node, and a discharge circuit connected between the output terminal and the ground voltage node to discharge a current at the output terminal in response to a blank synchronization signal.

Abstract: The present invention relates to a conditioner for a chemical-mechanical planarization (CMP) pad, which is used in a CMP process that is part of a semiconductor element manufacturing process, and more particularly, to a conditioner for a soft pad, and a method of manufacturing the same, wherein the conditioner can be used under CMP conditions using a slurry having a small amount of polishing particles, and/or a porous pad having comparatively low hardness and very high porosity.

Abstract: A polarization switching device includes a lower panel; an upper panel facing the lower panel; a liquid crystal layer disposed between the lower panel and the upper panel; and a driver to apply a first driving voltage and a second driving voltage to the lower panel and the upper panel, respectively, the first driving voltage to transition among a center voltage, a first voltage and a second voltage. The first voltage and the second voltage have the same difference in value from the center voltage. The driver includes a voltage changing unit to generate the first voltage and the second voltage based on a digital data input to a first digital-analog converter.

Abstract: A display apparatus includes a display panel, a transformer disposed under the display panel and including a primary winding and a secondary winding which are separated from each other and an insulating section between the primary winding and the secondary winding, and a lower housing member on which the display panel is placed and to which the transformer is fixed. A first region corresponding to the insulating section of the transformer is defined in the lower housing member, and at least one hole is disposed in the first region of the lower housing member.