Patent application number | Description | Published |
20090009436 | PLASMA DISPLAY PANEL DEVICE AND DRIVE METHOD THEREOF - Provided are a PDP device and a drive method thereof which restrict the generation of an erroneous discharge in the all-cell reset period and to restrict the appearance of flickers in the areas with low grayscale levels even if some areas have a lower firing voltage than the other areas due to variation of a property in the panel surfaces or due to a long-term driving, or even if the voltage applied to the address electrode is increased with the pursuit of high definition. | 01-08-2009 |
20090015520 | PLASMA DISPLAY PANEL APPARATUS AND METHOD FOR DRIVING THE SAME - The present invention provides a plasma display panel and a method for driving the plasma display panel each of which ensures to suppress problems associated with an erroneous discharge resulting from accidental occurrence of a strong discharge in a reset period as well as with an address discharge delay. The problems are suppressed without applying an auxiliary erase pulse after the reset period ends. As a result, image display is provided with no flickering and good quality. The reset period includes a first step of applying a voltage having an ascending ramp waveform and a second step of applying a voltage having a descending ramp waveform. Between the first and second steps, a potential change waveform having a rise or fall (voltage change pulse) is applied at least to scan electrodes, sustain electrodes, or address electrodes. | 01-15-2009 |
20090091514 | METHOD OF DRIVING PLASMA DISPLAY PANEL AND PLASMA DISPLAY APPARATUS - Plural subfields are provided in one single field period, where each subfield has an initialization period during which a gradient waveform voltage gently falling is applied to a scan electrode to generate initializing discharge in a discharge cell; a writing period during which a scan pulse voltage is applied to a scan electrode to generate writing discharge in a discharge cell; and a sustain period during which sustain discharge is generated in a discharge cell selected, by the number of times corresponding to a luminance weight. The lowest voltage of a falling gradient waveform voltage in a subfield with the smallest luminance weight is set so as to be lower than that with the largest luminance weight. A method of driving a plasma display panel is provided that generates stable writing discharge without increasing voltage required for generating writing discharge even for a large-screen, high-luminance panel. | 04-09-2009 |
20090135172 | PLASMA DISPLAY DEVICE AND PLASMA-DISPLAY-PANEL DRIVING METHOD - In a plasma-display-panel driving method, a field period is divided into a plurality of sub fields, each of which has an address period for allowing discharge cells to selectively generate an address discharge and a sustain period for allowing the discharge cells having generated the address discharge to generate a sustain discharge by a number of times corresponding to a brightness weight. In the sustain period, a period for setting display electrode pairs to the base potential is disposed between the sustain pulse for causing the final sustain discharge in the sustain period and the previous sustain pulse. In a time interval corresponding to the lighting ratio of the discharge cells in the sub field after applying to the display electrode pairs a voltage for generating the final sustain discharge, a voltage for reducing the potential difference between electrodes of the display electrode pairs is applied to the display electrode pairs. Accordingly, it is possible to generate a stable address discharge and thus to reduce a crosstalk without increasing the voltage for generating the address discharge. | 05-28-2009 |
20090231317 | PLASMA DISPLAY PANEL DRIVE METHOD AND PLASMA DISPLAY DEVICE - A plasma display panel is driven by providing a plurality of subfields within one field period, the subfield having an initializing period in which the initializing discharge is generated in a discharge cell by applying a ramp-waveform voltage that is gradually descending to a scan electrode, an address period in which an address discharge is generated in the discharge cell by applying a scan pulse voltage to the scan electrode, and a sustain period in which sustain discharges by the number of times corresponding to the luminance weight are generated in the selected discharge cell. The lowest voltage is set of the descending ramp-waveform voltage in the subfield where the luminance weight is the smallest lower than the same voltage in the subfield where the luminance weight is the largest, and a voltage is kept for a prescribed period after the descending ramp-waveform voltage reaches the lowest voltage in the subfield where the luminance weight is the smallest. | 09-17-2009 |
20090237330 | PLASMA DISPLAY DEVICE AND PLASMA-DISPLAY-PANEL DRIVING METHOD - In a plasma display device, a period for connecting display electrode pairs to the base potential is disposed between a sustain pulse for generating the final sustain discharge and the previous sustain pulse based on a lighting ratio of the discharge cells in the corresponding subfield, and a voltage for reducing an interelectrode potential difference of the display electrode pairs is applied to the display electrode pairs in a predetermined time period corresponding to the lighting ratio of the discharge cells in the corresponding subfield after applying the sustain pulse for generating the final sustain discharge to the scan electrodes. | 09-24-2009 |
20090238991 | Method for preparation of forming mold having baked layer of lubricating mold-releasing agent - Disclosed is a method for preparation of a glass forming mold having a layer of a lubricating mold-releasing agent with reduced fluctuation in lubricating property, by baking the layer of the lubricating mold-releasing agent in a manner that prevents defects like blistering or peeling of the layer, or surface roughening. The method is a method for preparation of a glass forming mold having a baked layer of a lubricating mold-releasing agent on the mold surface thereof, wherein the method comprises heating the mold surface with an applied lubricating mold-releasing agent thereon by exposing the mold surface to a high frequency magnetic flux until the temperature of the mold surface reaches a predetermined baking temperature. | 09-24-2009 |
20090284446 | PLASMA DISPLAY DEVICE AND PLASMA-DISPLAY-PANEL DRIVING METHOD - A plasma display device includes a plasma display panel that has plural scan electrodes and plural sustain electrodes constituting display electrode pairs; and a sustain pulse generating circuit that divides a field period into a plurality of sub fields having an initializing period, an address period, and a sustain period and that generates the sustain pulse with a variable rising slope. The sustain pulse generating circuit generates at least two kinds of sustain pulses in which the rising slope of one sustain pulse is steeper than that of the other sustain pulse in the sustain period of at least one sub field of the plural sub fields and applies the sustain pulse having the steeper rising slope to one electrode of each display electrode pair continuously twice or more at the end of the sustain period. | 11-19-2009 |
20100013819 | PLASMA DISPLAY PANEL APPARATUS DRIVING METHOD AND PLASMA DISPLAY PANEL APPARATUS - In a former half (T | 01-21-2010 |
20100118056 | PLASMA DISPLAY DEVICE AND PLASMA DISPLAY PANEL DRIVING METHOD - In a plasma display device and a method for driving a plasma display panel, fluctuation of emission luminance of a discharge cell is reduced and display quality of an image is improved. The plasma display device is provided with a plasma display panel having a plurality of scanning electrodes and sustaining electrodes which configure a display electrode pair. The plasma display device is also provided with a sustaining pulse generating circuit, which has a plurality of subfields having an initializing period, a writing period and a sustaining period in one field period, and generates three kinds of sustaining pulses, i.e., a first sustaining pulse to be reference, a second sustaining pulse whose start-up is sharper than that of the first sustaining pulse and that of a third sustaining pulse, and the third sustaining pulse whose trailing edge is sharper than that of the first sustaining pulse and that of the second sustaining pulse, by periodically switching the pulses. In a sustaining period of at least one subfield in one field period, the third sustaining pulse is applied to one electrode of the electrode pair, then just after the application, the second sustaining pulse is applied to the other electrode of the display electrode pair. | 05-13-2010 |
20110210991 | PLASMA DISPLAY DEVICE AND PLASMA DISPLAY PANEL DRIVING METHOD - Display luminance is uniformized and the brightness is enhanced. A plasma display device has image signal processing circuit including loading correction part. The loading correction part has: number of lit cells calculator for calculating the number of discharge cells to be lit in each display electrode pair, in each subfield; load value calculator for calculating a load value of each discharge cell, according to the calculation result in number of lit cells calculator; correction gain calculator for calculating a correction gain of each discharge cell, according to the position of the discharge cell and the calculation result in load value calculator, such that the correction gain is smaller in the central portion than in the peripheral portion on the plasma display panel's image display surface; and corrector for subtracting the multiplication result of the output from correction gain calculator and an input image signal, from the input image signal. | 09-01-2011 |