Patent application number | Description | Published |
20090009435 | Method of Driving Plasma Display Panel and Plasma Display Unit - A method of driving a panel and a plasma display unit is provided, wherein one field comprises a plurality of subfields, each having an addressing period for producing an address discharge selectively in any of discharge cells, and a sustaining period for producing a sustain discharge by applying a number of sustaining pulses corresponding to a weight of brightness in the discharge cell where the address discharge has been produced. Provided therein is a sustaining pulse generator circuit comprising a power recovery section for rising or falling the sustaining pulse by producing resonance between an inter-electrode capacitance of a display electrode pair and an inductor, and a clamping section for clamping a voltage of the sustaining pulse at a predetermined potential, wherein the power recovery section is used to set twice a time of rising the sustaining pulse to become equal to or longer than a duration of the sustaining pulse. The method and the plasma display unit realize a remarkable reduction of power consumption while achieving high brightness of the panel. | 01-08-2009 |
20090015516 | DISPLAY DEVICE AND METHOD OF DRIVING THE SAME - A sub-field lighting rate measuring unit measures a lighting rate in a final sub-field. When the measured lighting rate exceeds a threshold value, a blank signal generator maintains a blank signal at a low level in a sustain time period in a sub-field. An output control circuit brings an output control signal into a low level on the basis of the blank signal. In this case, no data pulse is applied to an address electrode, so that there is no power consumed at the time of the rise and the fall of the data pulse. | 01-15-2009 |
20090096719 | METHOD OF DRIVING PLASMA DISPLAY PANEL, AND PLASMA DISPLAY DEVICE - A method and device for driving a plasma display panel are provided that do not cause false lighting even if the all-cell initializing operation becomes unstable. In an initializing period of a subfield, an all-cell initializing operation of causing initializing discharge in all discharge cells or a selective initializing operation of causing initializing discharge in the discharge cell that has caused sustain discharge in the last sustain period is performed. In a field corresponding to an image signal for displaying black on the whole screen, an abnormal charge erasing period for applying rectangular waveform voltage to the scan electrode is disposed after the initializing period in the subfield where the all-cell initializing operation is firstly performed. In a field corresponding to an image signal other than the image signal for displaying black on the whole screen, an abnormal charge erasing period for applying rectangular waveform voltage to the scan electrode is disposed after the initializing period in any subfield after the subfield where the all-cell initializing operation is firstly performed. | 04-16-2009 |
20090146922 | Image Display Device - An image display device includes a pair of sustain pulse generators for applying either a first sustain pulse or a second sustain pulse to the display electrodes. The first and second sustain pulses generate a sustain discharge twice and once, respectively, in discharge cells when the voltage applied between the display electrodes changes. The application of the first sustain pulse is performed by generating a first discharge by applying a voltage to one of the display electrodes using the clamp corresponding to the one of the display electrodes, and then generating a second discharge by applying a voltage to the other of the display electrodes using the clamp corresponding to the other of the display electrodes. The application of the second sustain pulse is performed by generating a first discharge by applying a voltage to each of the display electrodes using the clamps corresponding to each of the display electrodes. | 06-11-2009 |
20090153439 | PLASMA DISPLAY DEVICE AND PLASMA DISPLAY PANEL DRIVE METHOD - A plasma display device includes a plurality of sub fields, each sub field having an address period and a sustain period in which a sustain discharge is generated by applying a sustain pulse by the number of times corresponding to a brightness weight. A sustain pulse generating circuit has a power recovery section for raising or lowering the sustain pulse by allowing an inter-electrode capacitor of a display electrode pair including a scan electrode and a sustain electrode and an inductor to resonate and a clamp section for clamping a voltage of the sustain pulse to a predetermined voltage. The sustain pulse generating circuit sets a sustain pulse for generating a sustain discharge just before the final sustain discharge in the sustain period to a sustain pulse other than a sustain pulse having the shortest repetition period. | 06-18-2009 |
20090167640 | PLASMA DISPLAY PANEL DRIVING METHOD AND PLASMA DISPLAY DEVICE - A plasma display panel driving method and a plasma display device capable of reducing initializing spots generated immediately after the start of driving the plasma display panel, and improving the quality of images to be displayed. A plurality of subfields, each including an initializing period, an address period, and a sustain period, are provided in one field. The one field includes at least one of the subfields in which a gently increasing ramp waveform voltage is applied to the scan electrodes in the initializing period thereof. The ramp waveform voltage to be applied to the scan electrodes for the first time after the start of driving the plasma display panel is generated so as to have a gentler slope than the other ramp waveform voltages have. | 07-02-2009 |
20090184952 | PLASMA DISPLAY DEVICE AND DRIVING METHOD OF PLASMA DISPLAY PANEL - A plasma display device has a plasma display panel, an accumulative adding circuit for accumulatively adding predetermined values every predetermined unit time while current is applied to the plasma display panel, and a judging circuit for judging the property of an image to be displayed on the plasma display panel. The accumulative adding circuit varies the predetermined values in response to the judgment result of the judging circuit. | 07-23-2009 |
20090278863 | PLASMA DISPLAY PANEL DRIVE METHOD AND PLASMA DISPLAY DEVICE - A panel drive method and a plasma display device which increase the luminance of a panel and enable further reduction of power consumption are provided with the following configuration. One field is composed of a plurality of subfields including a address period during which a address discharge is selectively induced in discharge cells and a sustain period during which sustain pulses the number of which corresponds to the luminance weight are applied to induce sustain discharges in the discharge cells where the address discharges are induced. The plasma display device has a sustain pulse generating circuit composed of a power recovering circuit for inducing the rise and fall of each sustain pulse by resonating the inter-electrode capacity of a display electrode pair with an inductor and a clamp section for clamping the voltage of the sustain pulses to a predetermined voltage. The repetition period of the sustain pulse can be set according to the average luminance level of the image signal. | 11-12-2009 |
20090289960 | PLASMA DISPLAY DEVICE AND PLASMA DISPLAY PANEL DRIVE METHOD - A plasma display device includes a sustain pulse generating circuit having a power recovery section for raising or lowering the sustain pulse by allowing an inductor and an inter-electrode capacitor of the display electrode pair to resonate and a clamp section for clamping a voltage of the sustain pulse to a predetermined voltage. The sustain pulse generating circuit sets the sustain pulse generated in the sustain period so as to include sustain pulses in which the lengths of time for raising the sustain pulses using the power recovery section are different from each other, and sets the sustain pulse for generating the final sustain discharge in the sustain period to a sustain pulse other than a sustain pulse in which the length of time for raising the sustain pulse is the longest. | 11-26-2009 |
20110037755 | DRIVING METHOD OF PLASMA DISPLAY PANEL - A driving method of an alternating-current surface discharge type PDP is provided. In the initializing period. an operation that applies a predetermined voltage for causing discharge regardless of the presence or absence of the former discharge to a scan electrode and causes the initializing discharge in the discharge cell is assumed as a forcibly initializing operation. In the address period, the time when a scan pulse is applied to the scan electrode and an address pulse is applied to the data electrode is assumed to be address time. In each of discharge cells, the forcibly initializing operation is performed in one of a plurality of fields, and the address time in the address period of a field that does not, undergo the forcibly initializing operation is set to be longer than the address time in the address period of a field that undergoes the forcibly initializing operation. | 02-17-2011 |
20110080380 | PLASMA DISPLAY DEVICE AND METHOD FOR DRIVING PLASMA DISPLAY DEVICE - A plasma display device has a plasma display panel, a scan electrode driving circuit, a sustain electrode driving circuit, and a data electrode driving circuit. In the sustain period of at least one subfield, the scan electrode driving circuit and the sustain electrode driving circuit apply a plurality of sustain pulses alternately to scan electrodes and sustain electrodes, and the data electrode driving circuit applies a data pulse to data electrodes by changing the timing according to the sustain pulses while the sustain pulses are applied. | 04-07-2011 |
20120019570 | METHOD FOR DRIVNG PLASMA DISPLAY PANEL AND PLASMA DISPLAY DEVICE - In the display of an image at a low average picture level, the luminance of black level of the display image is reduced so as to enhance the contrast. In the display of an image at a high average picture level, an address discharge is caused stably. Thereby, the image display quality is enhanced. For this purpose, a specified-cell initializing subfield where a forced initializing waveform is applied to predetermined scan electrodes and a non-initializing waveform is applied to the other scan electrodes in the initializing period, and a selective initializing subfield where a selective initializing waveform is applied to all the scan electrodes in the initializing period are set. A specified-cell initializing field having the specified-cell initializing subfield and the plurality of selective initializing subfields is set. The frequency of forced initializing waveforms generated is changed according to the magnitude of average picture level of an input image signal such that the frequency of forced initializing waveforms applied to the scan electrodes is reduced as the average picture level decreases. | 01-26-2012 |
20120019571 | METHOD FOR DRIVING PLASMA DISPLAY PANEL AND PLASMA DISPLAY DEVICE - In the display of an image having a large black area, the luminance of black level of the display image is reduced so as to enhance the contrast. In the display of an image having a small black area, an address discharge is caused stably. Thereby, the image display quality is enhanced. For this purpose, a specified-cell initializing subfield where a forced initializing waveform is applied to predetermined scan electrodes and a non-initializing waveform is applied to the other scan electrodes in the initializing period, and a selective initializing subfield where a selective initializing waveform is applied to all the scan electrodes in the initializing period are set. A specified-cell initializing field having the specified-cell initializing subfield and the plurality of selective initializing subfields is set. The rate of regions where the gradation values of luminance are less than a predetermined value on the image display surface is calculated as a black area. The frequency of forced initializing waveforms generated is changed according to the size of the black area such that the frequency of forced initializing waveforms applied to the scan electrodes is reduced as the black area increases. | 01-26-2012 |
20120026142 | PLASMA DISPLAY PANEL DRIVE METHOD AND PLASMA DISPLAY DEVICE - The luminance of black level in an image displayed on a plasma display panel is reduced to enhance the contrast and image display quality. For this purpose, in an initializing period, one of a forced initializing waveform, a selective initializing waveform, and a non-initializing waveform is applied to scan electrodes. Further, one field is formed of a special initializing subfield where the forced initializing waveform and the non-initializing waveform are selectively generated, and a plurality of selective initializing subfields where only the selective initializing waveform is generated. The number of forced initializing waveforms applied to one scan electrode is one in one field group. The non-initializing waveform is applied to the scan electrodes on both sides of the scan electrode applied with the forced initializing waveform in a special initializing subfield, in at least two special initializing subfields, i.e. the special initializing subfield and a special initializing subfield immediately succeeding the special initializing subfield. | 02-02-2012 |
20120068987 | PLASMA DISPLAY PANEL DRIVE METHOD AND PLASMA DISPLAY DEVICE - In the driving method of a plasma display panel, one field contains a plurality of subfields and each of which has the following periods: an address period for generating an address discharge; a sustain period where a voltage is applied to data electrodes and sustain pulses corresponding to luminance weight are applied to scan electrodes and sustain electrodes for generating a sustain discharge; and an erase period where a voltage is applied to the scan electrodes and the sustain electrodes for generating an erase discharge. The erase discharge is generated selectively in the discharge cell having undergone an address discharge in the immediately preceding address period. In the sustain period of at least one of the subfields, a voltage to be applied to the data electrodes of the discharge cells having green phosphors is lower than that to be applied to the data electrodes of the discharge cells having red phosphors. | 03-22-2012 |
20120075283 | PLASMA DISPLAY PANEL DRIVE METHOD AND PLASMA DISPLAY DEVICE - In a driving method for a plasma display panel, in the initializing period in at least one of a plurality of subfields, selective initializing operation is performed that selectively causes initializing discharge only in a discharge cell having undergone address discharge in an immediately preceding address period. The selective initializing operation includes the step of applying first voltage to the sustain electrode and applying an up-ramp waveform voltage to the scan electrode, the step of applying a first down-ramp waveform voltage to the scan electrode and then applying a positive rectangular voltage to it, and the step of applying second voltage higher than the first voltage to the sustain electrode and applying a second down-ramp waveform voltage to the scan electrode. | 03-29-2012 |
20120086690 | PLASMA DISPLAY PANEL DRIVE METHOD AND PLASMA DISPLAY DEVICE - Forced initializing operation is omitted while address operation is performed stably, light emission related to no gradation display is eliminated, and the contrast is largely improved. In an erasing period, erasing discharge is selectively caused only in the discharge cell having undergone address discharge in the immediately preceding address period. It is assumed that first voltage is derived by subtracting voltage applied to a data electrode from low-side voltage of a sustain pulse, second voltage is derived by subtracting voltage applied to the data electrode from high-side voltage of the sustain pulse, and third voltage is derived by subtracting low-side voltage of an address pulse applied to the data electrode from low-side voltage of a scan pulse. The voltage derived by subtracting the third voltage from the first voltage is not lower than a discharge start voltage w here t he data electrode is used as the positive electrode and the scan electrode is used as the negative electrode. The voltage derived by subtracting the third voltage from the second voltage does not exceed the sum of a discharge start voltage where the data electrode is used as the positive electrode and the scan electrode is used as the negative electrode and a discharge start voltage where the data electrode is used as the negative electrode and the scan electrode is used as the positive electrode. | 04-12-2012 |
20120218240 | PLASMA DISPLAY PANEL DRIVING METHOD AND PLASMA DISPLAY DEVICE - Stable address discharge is caused while securing a sufficient voltage setting margin, and an image of high quality is displayed on a plasma display panel. For this purpose, in the selective initializing operation, first discharge is caused by applying first voltage to the sustain electrode and applying up-ramp waveform voltage to the scan electrode. Next, second discharge is caused by applying down-ramp waveform voltage to the scan electrode. Next, third discharge is caused by applying positive rectangular waveform voltage to the scan electrode. Next, fourth discharge is caused by applying second voltage higher than the first voltage to the sustain electrodes and applying down-ramp waveform voltage to the scan electrode. The length of applying time of the positive rectangular waveform voltage to the scan electrode is changed based on the number of sustain pulses occurring in the sustain period of the immediately preceding subfield. | 08-30-2012 |
20120249500 | METHOD OF DRIVING PLASMA DISPLAY DEVICE, PLASMA DISPLAY DEVICE, AND PLASMA DISPLAY SYSTEM - An address period is shortened while degradation of image display quality of a plasma display apparatus is suppressed. For this purpose, in a driving method for a plasma display apparatus including a plasma display panel with a plurality of discharge cells having a scan electrode, a sustain electrode, and a data electrode, and a driver circuit, the following operation is performed. The driver circuit forms one field period by a subfield that displays an interlace signal as an image signal thinned out every one line and a subfield that displays oblique line interpolated data generated by interpolating oblique lines detected by an image signal. In the subfield displaying an image signal, the driver circuit performs two-line simultaneous address operation with application of a scan pulse simultaneously to two adjacent scan electrodes so as to generate an address discharge in a discharge cell. | 10-04-2012 |
20120256978 | METHOD OF DRIVING PLASMA DISPLAY DEVICE, PLASMA DISPLAY DEVICE, AND PLASMA DISPLAY SYSTEM - An address period is shortened while degradation of image display quality of a plasma display apparatus is suppressed. For this purpose, in a driving method for a plasma display apparatus, the following operation is performed. A field for the right eye and a field for the left eye are alternately displayed on the plasma display panel. In each of the field for the right eye and the field for the left eye, a subfield having a smallest luminance weight occurs first, a subfield having a largest luminance weight occurs next, and the other subfields occur thereafter. In the subfield having the smallest luminance weight and the subfield having the largest luminance weight, one-line address operation for applying a scan pulse to each scan electrode is performed. In the other subfields, two-line simultaneous address operation for applying a scan pulse simultaneously to two adjacent scan electrodes is performed. | 10-11-2012 |
20120281032 | PLASMA DISPLAY DEVICE, PLASMA DISPLAY SYSTEM AND PLASMA DISPLAY PANEL DRIVING METHOD - In a plasma display apparatus capable of displaying an image for stereoscopic view, the image display quality is enhanced. For this purpose, the plasma display apparatus includes a driver circuit and a timing generation circuit. The driver circuit drives the plasma display panel by alternately repeating a field for the right eye and a field for the left eye. The timing generation circuit generates shutter opening/closing timing signals. The driver circuit applies the sustain pulses equal in number to the luminance weight multiplied by a luminance magnification to each scan electrode and each sustain electrode, in the subfields except the first subfield. In the first subfield, the driver circuit applies the sustain pulses greater in number than the luminance weight multiplied by the luminance magnification to each scan electrode and each sustain electrode. | 11-08-2012 |
20130002733 | PLASMA DISPLAY DEVICE DRIVING METHOD, PLASMA DISPLAY DEVICE, AND PLASMA DISPLAY SYSTEM - A plasma display apparatus usable as a 3D image display apparatus can reduce the crosstalk for a user who views a 3D image displayed on a plasma display panel through shutter glasses. For this purpose, the plasma display apparatus displays the 3D image on the plasma display panel having a plurality of pixels each of which is formed of a plurality of discharge cells by alternately repeating a right-eye field and a left-eye field. The plasma display apparatus adds a predetermined gradation value to an image signal to be displayed in a certain field when the number of pixels where the gradation equal to or higher than a high gradation threshold is displayed in the field immediately before a certain field and the gradation equal to or lower than a low gradation threshold is displayed in the certain field is equal to or larger than a number-of-pixels threshold. | 01-03-2013 |
20130021318 | METHOD FOR DRIVING PLASMA DISPLAY PANEL AND PLASMA DISPLAY DEVICE - In display of an image on a plasma display panel, the contrast of the display image is enhanced. For this purpose, the voltage obtained by subtracting the voltage applied to the data electrode from the low-side voltage of the sustain pulses applied to the scan electrode in the sustain period is defined as a first voltage. The voltage obtained by subtracting the voltage applied to the data electrode from the high-side voltage of the sustain pulses applied to the scan electrode is defined as a second voltage. The voltage obtained by subtracting the low-side voltage of the address pulse applied to the data electrode from the low-side voltage of the scan pulse applied to the scan electrode in the address period is defined as a third voltage. Based on these definitions, the voltage applied to each electrode is set so as to satisfy the conditions that: the voltage obtained by subtracting the third voltage from the first voltage is equal to or higher than the discharge start voltage between the data electrode as an anode and the scan electrode as a cathode; and the voltage obtained by subtracting the third voltage from the second voltage is equal to or lower than the sum of the discharge start voltage between the data electrode as an anode and the scan electrode as a cathode and the discharge start voltage between the data electrode as a cathode and the scan electrode as an anode. | 01-24-2013 |