Abstract: Provided in the present disclosure are a shift register unit, a gate driving circuit, a display apparatus and a control method for the display apparatus. The shift register unit includes: an input sub-circuit, having a first terminal connected to a first signal line, a second terminal connected to a pull-up node, and a third terminal connected to an input signal line; an output sub-circuit, configured to output a clock signal inputted by the clock signal line to the output terminal under the control of the pull-up node; a shutdown control sub-circuit, having a first terminal connected to the output terminal, a second terminal connected to a first shutdown control signal line, and a third terminal connected to a second shutdown control signal line, wherein the shutdown control sub-circuit is configured to output a second shutdown control signal to the output terminal under a control of a first shutdown control signal.

Abstract: An adaptive system for efficient and long-range wireless power delivery using magnetically coupled resonators responds to changes in a dynamic environment, and maintains high efficiency over a narrow or fixed frequency range. The system uses adaptive impedance matching to maintain high efficiency. The wireless power transfer system includes a drive inductor coupled to a high-Q transmitter coil, and a load inductor coupled to a high-Q receiver coil. The transmitter coil and receiver coil for a magnetically coupled resonator. A first matching network is (i) operably coupled to the drive inductor and configured to selectively adjust the impedance between the drive inductor and the transmitter coil, or (ii) is operably coupled to the load inductor and configured to selectively adjust the impedance between the load inductor and the receiver coil.

Abstract: A drive device includes: a gate driving unit that has gate driving circuits each driving gates of switching elements connected to each other in series; a negative-side power source that supplies a negative potential to the gate driving unit, where the negative potential steps down a reference potential that is a potential on a low side of the switching element; a negative-side capacitor for supplying a negative potential to the gate driving unit, where the negative potential steps down a reference potential that is a potential on a high side of the switching element; a timing detecting circuit that detects charging timing at which the negative-side capacitor is to be charged based on a potential state of the gate driving circuit on a high side; and a charging circuit that charges the negative-side capacitor by using the negative-side power source at the charging timing.

Abstract: A display apparatus is provided. Conducting states of switches in a pixel are switched to change charges stored in electrical energy storage cells that are connected to the switches, so as to provide a multi-stage driving voltage to a pixel electrode without increasing the manufacturing cost and circuit area of the display apparatus.

Abstract: According to one embodiment, an electronic device includes a circuit board and a circuit component on an upper surface or a lower surface of the circuit board. The circuit component includes a first ceramic capacitor and a second ceramic capacitor. Vibration characteristics of the first ceramic capacitor and a second ceramic capacitor are opposed to each other. The first ceramic capacitor is near the second ceramic capacitor to cause vibrations of the first and second ceramic capacitors to cancel each other.

Abstract: Embodiments of the present disclosure provide a test circuit, a test method, a display panel and a display apparatus. Each of the signal input terminals may input a plurality of signals in a time division multiplexed manner, and in turn may be controlled by the corresponding switches to form a plurality of signal lines, a signal flow of the plurality of signal lines are totally different from each other under control of the switches. For example, one of the signal lines may function as a signal input line, and the other one of the signal lines may function as a signal input line for other specific testing, such as aging process so as to input signals different from the normal turn-on state signals. Consequently, by controlling the corresponding switches through the control signal terminals so that different input signals pass through different signal lines into the display panel to meet testing requirements of normal turn-on state testing, aging process and so on for the display panel.

Abstract: An apparatus includes a gate drive circuit and a GaN HEMT switch where the gate drive circuit has a gate drive output to produce a gate drive signal in response to a gate control signal. The switch has a gate connected to the gate drive circuit through a gate drive resistor. The gate drive circuit includes a NPN (or NMOS) turn-on transistor and a PNP (or PMOS) turn-off transistor. The gate drive circuit includes a turn-on resistor with a first resistance coupled to the turn-on transistor and a turn-off resistor with a second resistance coupled to the turn-off transistor. The turn-on and turn-off transistors, gate drive resistor, the switching device, but not the turn-on and turn-off resistors are disposed in an integrated circuit to reduce a gate-drive loop inductance. The first and second resistances can be different to adjust the turn-on and turn-off speeds of the switching device.

Abstract: A circuit for generating a voltage waveform at an output node. The circuit includes a voltage rail connected to the output node via a voltage rail switch; an anchor node connected to the output node via an inductor and a bidirectional switch, wherein the bidirectional switch includes two or more transistors connected in series; and a control unit configured to change the voltage at the output node by controlling the voltage rail switch and the bidirectional switch so that, if a load capacitance is connected to the output node, a resonant circuit is established between the inductor and the load capacitance. The circuit may be included in an apparatus for use in processing charged particles, e.g. for use in performing mass spectrometry or ion mobility spectrometry.

Abstract: A display including: pixels; a gate driver for supplying a gate signal to gate lines; a lighting test circuit coupled to a first input line (for transmitting a lighting test signal), and a second input line (for transmitting a test control signal), the light test circuit being for supplying the lighting test signal to data lines according to the test control signal; a first power supply line for supplying a gate high level voltage to the gate driver and at a periphery of the gate driver and the lighting test circuit; and a second power supply line for supplying a gate low level voltage to the gate driver and at a periphery of the gate driver and the lighting test circuit. The second input line is coupled to the first power supply line or the second power supply line through a resistor.

Abstract: A display apparatus, that can prevent thermal destruction and burning with a simple structure, has been disclosed. In the apparatus it is judged that there is possibility of a pattern, whose area with high brightness is small, being displayed frequently, when a state in which the total light emission pulse number remains large occurs with high frequency, and if such a state is detected, the total light emission pulse number (sustain frequency) is reduced to prevent the thermal destruction and burning.

Abstract: A driving method of a liquid crystal display panel having a source line and a counter electrode, includes driving the counter electrode to a first potential, driving the, counter electrode to a second potential being different from the first potential, setting the counter electrode and the source line to a third potential by short-circuiting the counter electrode and the source line to an interconnection having a potential between the first potential and the second potential, and driving the source line to a potential corresponding to an image data. The setting of the counter electrode and the source line to the third potential occurs in a period of one frame.

Abstract: In an image display apparatus, when image data is transferred from an LCD controller to an LCD through a transmission cable having a plurality of signal lines and is displayed on a screen, the image data is divided sequentially by a plurality of lines from a front line so as to correspond to the number of signal lines and allocates the divided image data to the signal lines such that image data of which signal change is larger is allocated to a signal line which is closer to the ground line to transfer the image data. Therefore, the entire radiation noise which is generated can be reduced while maintaining quality of signals.

Abstract: A method of driving a plasma display apparatus including a scan electrode and a sustain electrode, that are positioned parallel to each other, are disclosed. The method includes supplying a scan signal to the scan electrode during an address period of a first subfield among a plurality of subfields of a frame, supplying a reset signal to the scan electrode during a reset period of a second subfield immediately following the first subfield, supplying a first signal between the scan signal and the reset signal to the scan electrode, and supplying a second signal overlapping the first signal to the sustain electrode. A pulse width of the second signal is smaller than a pulse width of the first signal.

Abstract: A method and apparatus for processing video pictures for dynamic false contour effect compensation. Each video picture is divided into at least a first type and second type of area according to the video gradient of the picture. A specific video gradient range is associated to each type. First and second sets of sub-field code words are allocated to the first and second types respectively. The second set is a subset of the first set. The pixels of the first and second types are encoded with the first and second sets of sub-field code words respectively. For at least one horizontal line of pixels including pixels of the first and second type, the area of second type is extended until the next pixel in the first type area is a pixel encoded by a sub-field code word belonging to both first and second set of sub-field code words.

Abstract: A control device for a matrix plasma display screen has a row driver circuit capable of sequentially selecting the rows of the matrix and a column driver circuit, for each column of the matrix, with an individual column driver unit that has at least a first transistor of the MOS type capable of emitting, towards each column of a desired set of columns, a state change signal in order to allow the transition of the set from a first state towards a second state, and a controller.

Abstract: A first ramp waveform (RW1) rising from a first potential (Vscn) to a second potential (Vscn+Vset) is applied to a plurality of scan electrodes (SCi) in a first period (t5 to t6), and a driving waveform dropping from a third potential (Ve1) to a fourth potential (0V) is applied to a plurality of sustain electrodes (SUi) before the first period (t5 to t6), and the plurality of sustain electrodes are held at the fourth potential (0V) in the first period (t5 to t6). At this time, a second ramp waveform (RW10) rising from a fifth potential (0 V) to a sixth potential (Vd) according to change of a potential of the first ramp waveform (RW1) is applied to a plurality of data electrodes (Dj) in a second period (t5 to t5a) that starts at a starting time point (t5) of the first period (t5 to t6) and is shorter than the first period (t5 to t6), thereby preventing generation of strong discharges between the plurality of data electrodes (Dj) and the plurality of scan electrodes (SCi).

Abstract: This invention relates to a driving apparatus of a plasma display panel that is capable of being operated stable, regardless of temperature. A driving apparatus of a plasma display panel according to the present invention includes a panel having a scanning electrode for receiving a scanning pulse in an address period and an address electrode for receiving a date pulse synchronized with the scanning pulse in the address period; and a pulse width controller for changing the width of the scanning pulse when the panel is driven at a low temperature.

Abstract: A driving method of a plasma display device according to an exemplary embodiment groups a plurality of address electrodes extending in a first direction into a plurality of groups, and logically divides each of the groups into a plurality of sub-groups. During a first period, a first pulse is sequentially applied to the plurality of groups, and a second pulse is sequentially applied to the plurality of sub-groups included in at least one of the plurality of groups during a second period following the first period. The first and second periods are address periods for sensing in a second direction crossing the first direction.

Abstract: It is an object to provide a driving method of a plasma display panel, whereby a dark contrast can be improved while suppressing an erroneous discharge. In a resetting step in a first unit display period, while a first reset pulse having a predetermined peak electric potential is applied to one of first row electrodes of row electrode pairs formed in the PDP, a second reset pulse having a peak electric potential smaller than that of the first reset pulse is applied to the other of the first row electrodes. In the resetting step in a second unit display period subsequent to the first unit display period, a second reset pulse is applied to each of the one and the other of the first row electrodes.

Abstract: A stable address discharge in a plasma display device is generated without increased voltage to cope with increase in the cumulative current-carrying time of a panel with high luminance. A cumulative time calculating circuit for calculating cumulative current-carrying time of the panel and a driving circuit for driving the panel. The driving circuit delivers collected power to the display electrode pairs and clamps each voltage of the display electrode pairs to power-supply voltage and base potential. A sustain period has a period, during which the voltage of the display electrode pairs is clamped to base potential, between the sustain pulse for generating the last sustain discharge in the sustain period and the immediately preceding sustain pulse. The length of the period is changed according to the cumulative current-carrying time calculated by the cumulative time calculating circuit.

Abstract: The present invention relates to a device for driving a plasma display panel having a plurality of cells arranged in rows and columns, said device comprising row address means for selectively addressing the display cell rows and creating, where required, in cooperation with means for selectively applying data voltages to the display columns, an electrical discharge inside the cell disposed at the intersection of the row and column selected during an address phase, and sustain means (I3, I4, I5, I6) for sustaining the electrical discharges inside said cell during a sustain phase immediately following the address phase. According to the invention, the row address means and/or the sustain means are capable of allowing a bi-directional current to flow in the display cells during the address and/or sustain phases. The capacitive and light-emission currents appearing during these phases can thus flow freely and do not create electromagnetic interference.

Abstract: A sustain pulse generation circuit of a plasma display device generates and switches a first sustain pulse for causing light emission having double peaks, a second sustain pulse having a falling edge steeper than that of the first sustain pulse, and a third sustain pulse having a rising edge and a falling edge steeper than those of the first sustain pulse and causing light emission having a single peak. The second sustain pulse or the third sustain pulse is generated immediately before the third sustain pulse. The first sustain pulse is generated immediately before the second sustain pulse. Provided between the second sustain pulse and the third sustain pulse and between the third sustain pulses is a first overlap period in which a time period for causing the corresponding sustain pulse to rise is overlapped with a time period for causing the corresponding sustain pulse to fall.

Abstract: In a flat panel display (FPD), a conductive heat proof plate is inserted between the back surface of a display panel, on which printed circuit boards (PCBs) and signal lines are formed, and signal lines. A back frame positioned on the back surface of the display panel is provided to cover the printed circuit boards and the signal lines. A shield can is formed in the internal surface region of the back frame corresponding to the printed circuit board on which a timing controller is mounted. The shield can is electrically coupled to the heat proof plate to improve resistance against the electromagnetic compatibility of a large flat panel display and to improve a thermal characteristic.

Abstract: A display and the thin-film-transistor discharge method therefore are used for providing a dual-gate thin film transistor to drive the electroluminescent element to emit light. While the thin film transistor (TFT) is discharged, an electric field is formed between the top-gate and the bottom-gate. The electric field is for improving the electric discharge effect at the channel of the TFT, and the magnitude of the applied electric field corresponds to the magnitude of the pixel voltage.

Abstract: A PDP sustain driver circuit including at least one high voltage gate driver IC (HVIC) having a logic functional block. The PDP sustain driver circuit includes a signal buffer for receiving two input signals and providing the two signals to the logic functional block; and at least four switches including a charging switch, a discharging switch, a sustain switch and a grounding recovery switch, the HVIC providing a unique control signal from the logic functional block to the four switches to control said four switches.

Abstract: The present method is to drive a plasma display panel which displays a frame composed of a plurality of sub-fields having different weights of luminance. The method comprises using plural kinds of application voltage waveforms different in light emission luminance, as pulse voltages for sustain discharges in display of each sub-field, and adjusting the number of waves in each of the plural kinds of application voltage waveforms according to the weight of luminance set for each sub-field, thereby performing gradation display.

Abstract: A thin film transistor (TFT) substrate includes a TFT that including a gate electrode, a source electrode, and a drain electrode formed on an insulating substrate divided into a display area and a non-display area to provide test driving signals provided from the outside to the display area, a test signal line connected to the drain electrode of the TFT, a pad unit signal line insulated from the test signal line by an insulating layer and connected to signal lines formed in the display area, and a jumping pad electrode electrically connecting the test signal line and the pad unit signal line to each other through a contact hole that penetrates the insulating layer, connected to a driving circuit for driving the display area, and providing driving signals provided from the driving circuit to the pad unit signal line and a flat panel display (FPD) including the same.

Abstract: In a plasma display panel, abnormal discharge in address periods is suppressed to enhance image display quality. The scan electrode driving circuit generates a first falling down-ramp voltage i.e. down-ramp voltage L2 or down-ramp voltage L4, in initializing periods, generates sustain pulses in sustain periods, generates a rising up-ramp voltage, i.e. erasing up-ramp voltage L3, at the ends of the sustain periods, and applies the voltages to the scan electrodes. After generating the sustain pulses in the sustain periods, the scan electrode driving circuit generates a second down-ramp voltage, i.e. erasing down-ramp voltage L5, which has a portion falling with a gradient gentler than that of down-ramp voltage L2 and down-ramp voltage L4. After generating erasing down-ramp voltage L5, the scan electrode driving circuit generates erasing up-ramp voltage L3 and applies the voltage to the scan electrodes.

Abstract: A driving circuit applied in an electronic display apparatus is provided. The driving circuit includes a first exchange circuit and a first buffer. The first buffer includes first and second input stages, a second exchange circuit and first and second output stages. The first exchange circuit selectively couples a first input signal and a first output signal outputted from the first output stage to one of the first and the second input stages; and selectively couples a second input signal and a second output signal outputted from the second output stage to the other of the first and the second input stages. The second exchange circuit selectively couples the first input stage to one of the first and the second output stages and selectively couples the second input stage to the other of the first and the second output stages.

Abstract: A method and a circuit for controlling a power recovery stage of a plasma display panel including a resonant circuit of at least one inductive element and one capacitive element, wherein the capacitive element is precharged to half a supply voltage of the display panel.

Abstract: A driving circuit of a data electrode is provided which includes a drive controlling unit, a first driving transistor and a second driving transistor. The drive controlling unit compares a previous data signal and a present data signal in response to an energy recovery enable signal and outputs a first driving signal and a second driving signal, which correspond to the comparison result. The first driving transistor transmits an address driving signal to an output node connected to the data electrode in response to the first driving signal. The second driving transistor transmits a reference voltage to the output node in response to the second driving signal.

Abstract: The plasma display device has a display panel having first and second display electrodes and address electrodes, an electrode drive circuit, and a drive control circuit for controlling the electrode drive circuit. The drive control circuit performs a reset drive control, address drive control and sustain drive control in each subfield. The drive control circuit performs an all cell reset drive control which resets all cells in a first subfield out of the plurality of subfields, and an ON cell reset drive control which resets ON cells in a second subfield. At a first temperature T1, an ultimate potential of an slope pulse of the first display electrode is controlled to be a first potential in the ON cell reset drive control, and at a second temperature T2>T1, the ultimate potential is controlled to be a second potential higher than the first potential.

Abstract: A plasma display device having a first diode with an anode coupled to an electrode. A first switch is coupled between a cathode of the first diode and a first voltage source that supplies a first voltage. A first inductor and a second switch are coupled in series between a power recovery capacitor and the cathode of the first diode, and a third switch is coupled between the anode of the first diode and a second voltage source that supplies a second voltage lower than the first voltage.

Abstract: A driving method for driving an LCD panel having a counter electrode and a source line. In a first period, the counter electrode is driven to a potential VCOMH. In a second period, the counter electrode and the source line are short-circuited to a power supply interconnection having a power supply potential VCI. In a third period, the counter electrode is connected to a ground interconnection while the source line is kept to be short-circuited to the power supply interconnection. In a fourth period, the counter electrode is pulled down to a potential VCOML lower than a ground potential In a fifth period, the source line is driven to a potential corresponding to an image data while the counter electrode is kept to the potential VCOML. The electric power consumed in pulling down the counter electrode from a positive potential to a negative potential can be effectively reduced.

Abstract: A display device (1) including a surface discharge type plasma display panel (2) performs an addressing operation, a sustain operation and a reset operation. In the addressing operation, address discharge of an opposed discharge form with the second electrode (Y) used as a cathode is generated between the second electrode (Y) and a third electrode (A) in a cell to be energized or in a cell not to be energized. In the reset operation, an obtuse wave pulse (Pr1) having a negative polarity is applied to the second electrode (Y) so as to generate charge adjustment discharge starting from discharge of the opposed discharge form with the second electrode (Y) used as a cathode between the second electrode (Y) and the third electrode (A).

Abstract: A plasma display apparatus is disclosed. The plasma display apparatus a plasma display panel including a front substrate on which a scan electrode and a sustain electrode are positioned parallel to each other, a rear substrate on which an address electrode is positioned to cross the scan electrode and the sustain electrode, and a barrier rib that is positioned between the front substrate and the rear substrate to partition a discharge cell and a driver supplying a sustain signal to the scan electrode and the sustain electrode in a sustain period of at least one of a plurality of subfields of a frame. A sustain signal supplied to the scan electrode overlaps a sustain signal supplied to the sustain electrode in the sustain period. The address electrode is electrically floated in the sustain period.

Abstract: A PDP apparatus having a driving circuit in which a circuit for applying a rising-slope waveform in a reset period, a circuit for applying a falling-slope waveform, and a clamp circuit for generating a falling waveform having a dulled waveform between the rising-slope waveform and the falling-slope waveform are comprised. The clamp circuit comprises a bidirectional switch having two FETs, and a gate feedback circuit is connected to a gate portion of the FET at a panel side. The PDP apparatus reduces a current noise occurring in a sustain electrode throughout the panel when switching the rising-slope waveform and the falling-slope waveform, thereby solving problems such as an increase of unnecessary radiation and stress on elements such as FETs on the path.

Abstract: A plasma display device driven during an address period and a sustain period includes a discharge cell defined by a scan electrode, a sustain electrode, and an address electrode, an addressing circuit for providing an address voltage to the address electrode, and an addressing compensation circuit for storing voltage corresponding to a displacement current generated during a sustain period to be utilized during the address period. The addressing compensation circuit includes a switch coupled with the address electrode through which the displacement current supplied from the scan electrode and the sustain electrode is received during the sustain period, and a capacitor coupled with the switch for storing the voltage corresponding to the displacement current received through the switch.

Abstract: A method of driving a plasma display device having a first electrode and a second electrode adjacent to one another in a discharge cell, including applying a first waveform at least once to the first electrode, the first waveform including a gradual increase from a first voltage to a second voltage followed by a gradual decrease from a third voltage to a fourth voltage, and applying a second waveform at least once to the first electrode after the first waveform is applied to the first electrode, the second waveform including a gradual increase from a fifth voltage to a sixth voltage followed by a gradual decrease from a seventh voltage to an eighth voltage. The first and second waveforms may be applied to the first electrode after turning on the plasma display device and before a display operation is performed.

Abstract: A plasma display driving method capable of displaying a vigorous image having enhanced maximum luminance and contrast. For this purpose, one field is divided into a plurality of sub-fields each including a sustain period. In the sustain period, the number of sustain pulses obtained by multiplying a proportionality factor by a brightness weight set for each of the sub-fields are applied to display electrode pairs to generate sustaining discharge in discharge cells having generated addressing discharge therein. Thus, the total number of the sustain pulses in one field period can be changed. When a predetermined image meeting predetermined conditions is displayed, the total number of the sustain pulses in one field period is made larger than those in the case where the other normal images are displayed.

Abstract: Subpixels on an electroluminescent (EL) display panel, such as an organic light-emitting diode (OLED) panel, are compensated for initial nonuniformity (“mura”) and for aging effects such as threshold voltage Vth shift, EL voltage Voled shift, and OLED efficiency loss. The drive current of each subpixel is measured at one or more measurement reference gate voltages to form status signals representing the characteristics of the drive transistor and EL emitter of those subpixels. Current measurements are taken in the linear region of drive transistor operation to improve signal-to-noise ratio in systems such as modern LTPS PMOS OLED displays, which have relatively small Voled shift over their lifetimes and thus relatively small current change due to channel-length modulation. Various sources of noise are also suppressed to further increase signal-to-noise ratio.

Abstract: The present invention relates to a method and apparatus for driving a plasma display panel that can be driven at a low voltage and prevent undesired discharge from being generated under high temperature environment.

Abstract: The present invention relates to a method and apparatus for driving a plasma display panel that can be driven at a low voltage and prevent undesired discharge from being generated under high temperature environment.

Abstract: The present invention relates to a method and apparatus for driving a plasma display panel that can be driven at a low voltage and prevent undesired discharge from being generated under high temperature environment.

Abstract: Provided are a method and apparatus for driving a PDP for widening a driving margin and improving contrast. The method for driving a PDP includes a first step of forming wall charges in cells with a set-up discharge using a set-up signal in a first sub-field and erasing the wall charges with a set-down discharge using a first set-down signal to initialize the cells, and a second step of erasing the wall charges with a set-down discharge generated using a second set-down signal different from the first set-down signal in a second sub-field, to initialize the cells. The method and apparatus for driving a PDP uniformly initialize sub-fields to widen the driving margin of PDP and remove a set-up discharge in at least one sub-field to improve the contrast of PDP.

Abstract: A plasma display apparatus and a method of driving the same are disclosed. The plasma display apparatus driven in a frame comprised of a plurality of subfields includes a plasma display panel including a scan electrode and a sustain electrode, and a driver. The driver supplies a first signal, that rises from a first voltage to a second voltage, is maintained at the second voltage during a predetermined period of time, and falls from the second voltage to a third voltage smaller than the first voltage with a slope, to the scan electrode. The predetermined period of time is set at different values in at least two subfields.

Abstract: The present invention relates to a method and apparatus for driving a plasma display panel that can be driven at a low voltage and prevent undesired discharge from being generated under high temperature environment.

Abstract: A plasma display apparatus and a driving method thereof are disclosed. The plasma display apparatus includes a plasma display panel comprising a first electrode and a second electrode, and a driver for applying a plurality of sustain signals to the second electrode while applying two consecutive sustain signals to the first electrode in a sustain period. A method of driving a plasma display apparatus includes applying a first sustain signal to a first electrode in a sustain period, after applying the first sustain signal to the first electrode, applying a plurality of sustain signals to a second electrode, and after applying the plurality of sustain signals to the second electrode, applying a second sustain signal consecutive to the first sustain signal to the first electrode.

Abstract: The present method is to drive a plasma display panel which displays a frame composed of a plurality of sub-fields having different weights of luminance. The method comprises using plural kinds of application voltage waveforms different in light emission luminance, as pulse voltages for sustain discharges in display of each sub-field, and adjusting the number of waves in each of the plural kinds of application voltage waveforms according to the weight of luminance set for each sub-field, thereby performing gradation display.

Abstract: A plasma display device and a method of driving the same, capable of reducing or preventing the deterioration of components such as a switching device, due to an overcurrent. In a reset period, in order to cause the voltage of a scan electrode to ramp down from a first voltage to a second voltage, a panel driver includes a falling ramp switch that repeats turn-on/turn-off operations, alternately coupling and de-coupling a low-level power supply to the scan electrode, resulting in a gradually falling ramp waveform. A switch controller generates a switching pulse to control the falling ramp switch. Each turn-on time of the switching pulse for the initial falling ramp waveform following a power-on of the plasma display device is controlled to be shorter than each turn-on time of the switching pulse for other falling ramp waveform.