WO2007129641A1 - プラズマディスプレイパネルの駆動方法および画像表示装置 - Google Patents
プラズマディスプレイパネルの駆動方法および画像表示装置 Download PDFInfo
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- WO2007129641A1 WO2007129641A1 PCT/JP2007/059309 JP2007059309W WO2007129641A1 WO 2007129641 A1 WO2007129641 A1 WO 2007129641A1 JP 2007059309 W JP2007059309 W JP 2007059309W WO 2007129641 A1 WO2007129641 A1 WO 2007129641A1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
- G09G3/294—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
- G09G3/292—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for reset discharge, priming discharge or erase discharge occurring in a phase other than addressing
- G09G3/2925—Details of priming
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
- G09G3/292—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for reset discharge, priming discharge or erase discharge occurring in a phase other than addressing
- G09G3/2927—Details of initialising
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/296—Driving circuits for producing the waveforms applied to the driving electrodes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/06—Details of flat display driving waveforms
- G09G2310/066—Waveforms comprising a gently increasing or decreasing portion, e.g. ramp
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0238—Improving the black level
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2007—Display of intermediate tones
- G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
- G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
Definitions
- the present invention relates to a driving method of a plasma display panel used for image display of a computer, a television or the like, and an image display device.
- PDPs plasma display panels
- the current mainstream AC surface discharge type PDP is a front panel in which scan electrodes and sustain electrodes are arranged in stripes on a front glass substrate, and a dielectric layer and a protective film layer are laminated to cover the electrodes. And an address electrode force S stripe pattern on the rear glass substrate, a protective layer is formed so as to cover the address electrode, and a rear panel on which a barrier rib is formed is bonded to the rear electrode substrate. ing.
- SF When displaying TV images in NTSC format, an image of 60 frames is displayed per second. Since 1S PDP originally expresses only two gradations that are lit or not lit, one frame is displayed in multiple subfields.
- the system is divided into (hereinafter referred to as “SF”) and the intermediate color is expressed by the combination. For example, the number of sustain nodes that are marked during the discharge sustain period of each SF is weighted in binary mode, such as 1, 2, 4, 8, 16, 32, 64, 128. Each color of green, blue and blue is expressed with 256 gradations.
- Each SF further emits light only to the cells that have performed the write discharge, the initialization period in which the wall charge necessary to cause the write discharge is accumulated by the weak discharge, the write period in which the cells to be lit by the write discharge are selected, This is divided into a sustain period for maintaining the sustain operation, and an erase period for performing the erase operation for erasing the wall charges by selectively generating an erase discharge only for the cells that have undergone the sustain operation in the last sustain period.
- Image display through a sequence of initialization, writing, maintaining, and erasing To do.
- Patent Documents 1 and 2 as an initialization pulse, a weak discharge is generated in a discharge cell by applying an initialization pulse having a ramp waveform portion whose potential changes with a gentle slope.
- a technique is known in which a desired wall charge is accumulated to thereby stably perform the next write operation.
- the cell aperture ratio decreases, so that the brightness tends to decrease and the image tends to become dark overall.
- the total pressure is 180 Torr or more and 750 Torr or less, and the xenon partial pressure it is 10%, 15%, 20%, 30%, 50%, 80%, 90%, 95%, 98%, 100%. It is being considered.
- Patent Document 1 Japanese Unexamined Patent Publication No. 2000-214823
- Patent Document 2 JP-A-2005-321680
- Non-Patent Document 1 IEEJ Technical Report No. 688, page 19, 2. Table 8
- Non-Patent Document 2 IDW'04 PDP7-2
- a weak discharge is originally generated in the discharge cell to accumulate a desired wall charge.
- a strong discharge hereinafter referred to as a strong discharge
- excess wall charge that cancels the electric field in the discharge cell is accumulated, so that a wall potential higher than the desired wall potential is formed at the end of the initialization period.
- the sustain display emits light during the sustain period, so that the image display cannot be performed normally, and the image is flickering or rough (see Patent Document 1).
- the black luminance increases and the contrast ratio decreases remarkably, and the image quality deteriorates significantly when displaying images with many low gradation representations.
- Non-Patent Document 1 the absolute number of electrons supplied to the protective film surface discharge space is reduced, the threshold voltage required for the start of discharge is increased, a strong electric field is generated in the cell, and a strong discharge is likely to occur.
- the present invention suppresses the occurrence of strong discharge during the initialization period when driving a PDP, thereby eliminating the flickering of the image and providing a high-definition and high-quality display.
- the purpose is to make it possible.
- one TV field is composed of a plurality of subfields, and the subfields constituting the plurality of subfields are included in an initialization period, a write period, and a sustain period.
- a priming pulse having the same polarity as the initialization pulse is applied to the second electrode facing the first electrode after the sustain period and before the slope of the initialization pulse is started. It was decided to apply.
- the priming pulse is applied immediately before the slope of the initialization pulse is started.
- (a) having an initialization period and a writing period means having an initialization period and a writing period but not a sustaining period
- (b) having an initialization period and a sustaining period means having an initialization period and a sustain period but not a writing period.
- the case means having an initialization period and a sustain period but not a writing period.
- taste Therefore, the priming noise is determined after the writing period of the subfield if the subfield preceding the initialization period does not have a sustaining period, and when the subfield preceding the initialization period has a sustaining period. Applied after maintenance period
- a plurality of subfields constituting one TV field include (a) a subfield having an initialization period and a writing period in the initialization period, the writing period, and the sustaining period, (b ) A subfield having an initialization period and a sustain period, and (c) a subfield having an initialization period, a write period, and a sustain period may be mixed.
- the “subfield initialization period” may be either an all-cell initialization period or a selective initialization period.
- the voltage is not limited to a ramp waveform or a blunt wave in which the voltage changes smoothly. Even if is a stepped waveform that changes stepwise, the average voltage change rate falls within the range of 0.1 lVZ / sec to lOVZw sec.
- the magnitude of the voltage of the priming pulse applied to the second electrode is preferably set to be larger than the threshold voltage at which discharge occurs in the discharge cell by the pulse.
- the threshold voltage at which discharge occurs in the discharge cell is Vf
- the priming pulse voltage is 0
- Vf lVf or more and less than Vf may be set.
- the voltage of the priming pulse is Vmin or more Vm It is preferable to be below ax.
- the PDP has a three-electrode structure with a discharge electrode pair and an address electrode
- a voltage formed between the address electrode and the other of the discharge electrode pair by the priming pulse having the same polarity as the initialization pulse is greater than a threshold voltage at which discharge occurs in the discharge cell, Alternatively, when the threshold voltage at which discharge occurs in the discharge cell is Vf, it is preferably 0.1 to less than Vf.
- the priming pulse having a polarity opposite to that of the initialization pulse may have a ramp waveform portion.
- an initial pulse having an inclined portion with a voltage change rate of 0.4 IV / ⁇ sec or more and 10 VZsec or less is applied to the first electrode during the initialization period of the subfield. If the sustain period is not provided in the subfield preceding the reset period, the write pulse period ends.If the sustain period is provided, the ramp period of the initialization pulse starts after the sustain period ends.
- the second electrode may be floated before starting.
- the second electrode is floated when a voltage having the same polarity as the initialization pulse is applied to the first electrode.
- the subfield preceding the initialization period when the subfield preceding the initialization period has (a) an initialization period and a writing period, the subfield preceding the initialization period is (b) after the writing period. ) Initialization period and sustain period or (c) If there is an initialization period, write period and sustain period, a priming pulse having the same polarity as the initialization pulse is applied to the second electrode after the sustain period.
- the priming pulse having the same polarity as the initialization pulse is applied to the second electrode, the priming discharge is generated by the application of the priming pulse, and the density of charged particles existing in the discharge space is increased. Priming operation ”). Therefore, when the inclined portion of the initialization pulse is applied, a weak discharge is likely to occur, and the occurrence of strong discharge can be suppressed.
- the first electrode and the first electrode are used in the case of the all-cell initialization operation.
- the potential difference between the two electrodes is reduced, and the potential difference between the first electrode and the second electrode is increased in the selective initialization operation.
- the slope of the initialization pulse is applied to the first electrode, the priming pulse has already ended, so the potential difference between the first electrode and the second electrode is the initial value.
- the potential difference is maintained at a desired value for the conversion operation. Therefore, the wall charge formation in the initialization operation is not prevented by the application of the priming noise.
- the priming pulse is applied before the slope of the priming norska initialization pulse is started. Therefore, when the slope of the initialization pulse is applied to the first electrode, It ’s already finished.
- the potential difference between the first electrode and the second electrode is not reduced, and the original wall charge formation is not prevented.
- the priming operation can be performed reliably.
- the threshold voltage at which discharge occurs in the discharge cell is set to Vf when the voltage of the priming pulse is set to 0.1 lVf or more and less than Vf, the light emission associated with the priming supply can be suppressed, so the contrast ratio is improved. can do.
- the voltage of the priming pulse is set to 0.5 Vf or more and less than Vf, both the effect of suppressing the light emission associated with the priming operation and the effect of suppressing the strong discharge by the priming operation can be expected.
- an initialization pulse is applied to one of the discharge electrode pair, and a priming pulse having the same polarity as the initialization pulse is applied to the address electrode.
- Priming discharge can be generated between the other electrode of the discharge electrode pair and the address electrode. That is, the electrode to which the initialization pulse is applied is not used for priming discharge, and priming discharge can be performed between the other electrodes. This produces an effect of preventing the priming discharge itself from becoming a strong discharge.
- a priming pulse having the same polarity as the initialization pulse is applied to the address electrode
- a priming pulse having the opposite polarity to the initialization pulse is applied to the other of the discharge electrode pair. Even if the voltage of the priming pulse applied to is small, priming discharge can be reliably generated between the other of the discharge electrode pair and the address electrode.
- a ramp waveform part that gradually changes with respect to the priming pulse having the opposite polarity to the initialization pulse, it is possible to suppress light emission due to priming discharge and erroneous discharge accompanying sudden voltage changes such as a rectangular wave. it can.
- the subfield preceding the initialization period has (a) an initialization period and a writing period, the subfield preceding the initialization period is (b) the initialization period after the writing period. And (c) If there is an initialization period, a writing period and a sustain period, there are a plurality of first electrodes after the sustain period and before the ramp of the initialization pulse is started, each having a different polarity.
- a voltage is applied, if the second electrode is allowed to float, the potential of the second electrode changes partially to the same polarity as the voltage applied to one of the first electrodes. Therefore, it is possible to generate a priming discharge between the second electrode portion where the voltage has changed partially and the other one of the first electrodes to which a voltage of the opposite polarity is applied.
- the second electrode is floated when a voltage having the same polarity as the initialization pulse is applied to the first electrode, the potential force of the second electrode has the same polarity as the voltage applied to the first electrode. Therefore, the priming discharge can be generated by the potential change of the second electrode.
- the priming discharge occurs, the charged particle density in the discharge space is increased when the inclined portion of the initialization pulse is applied, and a weak discharge is likely to occur. It can be suppressed.
- the present invention is effective as a technique for suppressing strong discharge in the initialization period.
- the effect can be expected for high-definition PDP, high brightness PDP with high total pressure ratio or high xenon partial pressure ratio.
- FIG. 1 is a perspective view showing a main part of a PDP that works according to an embodiment.
- FIG. 2 is an electrode wiring diagram of a PDP that is useful for an embodiment.
- FIG. 3 is a block diagram showing the configuration of a PDP device that is relevant to the embodiment.
- FIG. 4 is a subfield configuration diagram of 1 TV field in the PDP driving method.
- FIG. 5 is a timing chart of drive voltages applied to each electrode by the drive method according to Example 1.
- FIG. 6 is a timing chart of drive voltages applied to each electrode by a drive method that is based on the prior art.
- FIG. 7 is a timing chart and APD waveforms of drive voltages applied to each electrode by the drive method according to Example 1.
- FIG. 8 is a timing chart of drive voltages applied to each electrode by the drive method according to Example 2.
- FIG. 9 is a timing chart and APD waveform of a driving voltage applied to each electrode by the driving method according to Example 3.
- FIG. 10 is a timing chart and APD waveforms of drive voltages applied to each electrode by the drive method according to Example 4.
- FIG. 11 is a timing chart of drive voltages applied to each electrode by the drive method according to Example 5.
- FIG. 12 is a timing chart of drive voltages applied to each electrode by the drive method according to Example 6.
- FIG. 13 Drive waveforms applied to the scan electrodes during the all-cell initialization period and APD output waveforms when a weak discharge is normally generated. [14] The drive waveform applied to the scan electrode during the all-cell initialization period and the APD output waveform when a strong discharge occurs.
- FIG. 15 is a diagram showing an example of an address electrode drive circuit for outputting drive waveforms according to the first embodiment.
- FIG. 16 is a diagram illustrating an example of an address electrode drive circuit for outputting drive waveforms according to the first embodiment.
- FIG. 17 is a diagram illustrating an example of a sustain electrode drive circuit for outputting a drive waveform according to the third embodiment.
- FIG. 18 is a diagram showing an example of a sustain electrode drive circuit for outputting a drive waveform according to the third embodiment.
- FIG. 19 is a diagram illustrating an example of a sustain electrode drive circuit for outputting a drive waveform according to the third embodiment.
- FIG. 20 is a diagram showing the limit slope of the ramp voltage of the initialization operation for each statistical variation time Ts of the discharge start time in the driving methods of Conventional Example 1 and Example 1.
- FIG. 22 is a diagram showing an example of a circuit for generating a priming pulse.
- a PDP apparatus that implements the present invention includes a PDP 1 having a region for displaying an image and a drive unit that drives the PDP 1.
- PDP1 The cell configuration and electrode arrangement of PDP1 will be described.
- the PDP to which the present invention can be applied is not limited to this, and a general AC surface discharge type PDP can be used.
- a front panel PA1 and a back panel PA2 are bonded to each other.
- the front panel PA1 includes a plurality of discharge electrode pairs including scan electrodes 19a and sustain electrodes 19b arranged on the front glass substrate 11 in a stripe shape, and the dielectric layer 17 and the protective layer so as to cover the scan electrodes 19a and the sustain electrodes 19b.
- the layer 18 is formed by being laminated.
- the scanning electrode 19a is formed of a transparent electrode 19al and a metal electrode 19a2, and the sustain electrode 19b is also formed of a transparent electrode 19bl and a metal electrode 19b2.
- the rear panel PA2 has a plurality of stripe-shaped address electrodes 14 on the rear glass substrate 12.
- the protective layer 13 is formed so as to cover the address electrode 14, and the partition wall 15 is formed on the protective layer 13.
- the discharge electrode pair and the address electrode 14 are three-dimensionally crossed, and a discharge cell is formed at each intersection.
- the barrier ribs 15 are formed in stripes along the address electrodes 14 or are formed so as to surround the discharge spaces 20 of the respective discharge cells in a box shape.
- a phosphor layer 16 is applied to the inner surface of the partition wall 15.
- phosphor layers of three colors of red, green and blue are arranged in order.
- Discharge gas is sealed in the discharge space 20 separated by the barrier ribs 15.
- This discharge gas is a mixed gas in which a force such as helium, neon, argon, krypton, and xenon is selected, and is usually sealed at a pressure of about 67 kPa.
- FIG. 2 is an overall electrode layout diagram of PDP1.
- n scan electrodes SCN 1 to n and n sustain electrodes SUS 1 to n are alternately arranged in the row direction, and m address electrodes Dl to m are arranged in the column direction. Yes.
- the PDP can express only two gradations, which are lit and non-lit, and therefore, the subfield method is generally used to drive the PDP.
- NTSC video is composed of 60 TV fields per second.
- SF subfields
- red, green A method is used in which the lighting time of each blue color is time-divided and intermediate colors are expressed by combinations thereof.
- one frame is divided into 8 SFs, and it is the number of maintenance nores to be marked in each SF, and weighted in binary mode like 1, 2, 4, 8, 16, 32, 64, 128.
- 256 gradations are expressed by the combination of the SF that is turned on.
- FIG. 4 is a diagram for explaining a gradation expression method for driving the PDP 1.
- each SF is divided into an initializing period, a writing period, a sustaining period, and an erasing period, and image display is performed by a series of sequences.
- each period will be described in more detail.
- FIG. 5 is a chart showing drive voltage waveforms applied to each electrode by each drive circuit, and shows the IS. F. and the second S. F. in one TV field.
- a weak discharge is generated by applying an initialization pulse to all the scan electrodes SCNl to n at once, and wall charges suitable for the operation of the subsequent writing period are accumulated (controlling the writing discharge).
- an all-cell initializing period 31 is provided, and an all-cell initializing pulse for generating an initializing discharge is applied to all the discharge cells.
- a selective initializing period 36 is provided, and a selective initializing pulse for generating an initializing discharge is applied only to the discharge cells that have experienced sustain discharge in the preceding SF.
- the all-cell initialization pulse applied in IS. F. is a portion that changes from ground potential O (V) to positive potential Va (V) in the first half (see Fig. 7).
- sustain electrodes SUSl to n and address electrodes Dl to m are basically held at ground potential 0 (V).
- V ground potential
- the priming pulse is applied to the address electrodes Dl to m.
- the ramp waveform portion S2 (with a negative slope) in which the potential Vc (V) force gradually decreases toward the potential Vbt (V) (slope 0.1 to 10 VZw sec) ( Figure 7 includes periods t4 to t5).
- the value of the voltage Vh is equal to or higher than the lowest voltage (threshold voltage) Vf at which discharge starts between the scan electrodes SCN1 to n and any of the sustain electrodes SUS1 to n and the address electrodes D1 to m, and the voltage Vbt is It is below the threshold voltage at which discharge starts between the scan electrode, the sustain electrode, and the address electrode.
- the charge generated by the weak discharge is accumulated as a wall charge around the address electrode, the scan electrode, and the sustain electrode on the wall surface surrounding the discharge space 20.
- this wall charge is accumulated, negative charge is generated on the surface of the protective layer 18 near the scan electrodes SCN 1 to n, and the protective layer near the sustain electrodes SUS 1 to n so that the electric field on the discharge space 20 and the electrode surface is weakened.
- 18 Positive charge is accumulated on the surface of the phosphor layer 16 near the surface 18 and the address electrodes Dl to m.
- the applied voltage of the scan electrode is switched from a positive voltage to a negative voltage, where a weak discharge is generated, and this weak discharge accumulates on the surface of the protective layer 18 near the scan electrodes SCN1 to n.
- the negative charges and the positive wall charges accumulated on the surface of the protective layer 18 near the sustain electrodes SUSl to n are weakened.
- the selective initialization pulse applied to scan electrodes SCNl to n after the second S. F. is directed from voltage Vq (V) to voltage Vbt (V) as shown in Figs. Therefore, it has a ramp waveform portion S3 (period t24 to t25 in Fig. 11) that gradually falls (slope 0.1 to LOVZ w sec).
- sustain electrodes SUSl to n are held at voltage Vh (V), and address electrodes Dl to m are basically held at ground potential 0 (V).
- a weak initializing discharge is selectively generated, on scan electrodes SCN1 to n and sustain electrodes SUS 1 to The wall voltage on n is weakened, and the wall voltage on the address electrodes D1 to m is also adjusted to a value suitable for the write operation.
- the state of the wall voltage at the end of the initializing period of the subfield before the discharge is maintained as it is.
- the voltage waveform of the initialization pulse is not limited to the one described above, and the potential difference between the scanning electrode and the address electrode is gradual (voltage change rate 0.1 lVZ / sec or more 10V Z It can be implemented in the same way as long as it can realize a state in which weak discharge continuously occurs within a period in which this voltage rises or falls (within (sec) or less), and the voltage changes slowly.
- a priming pulse to the address electrodes Dl to m prior to the period, a strong discharge can be suppressed during the initialization operation.
- the initial pulse may be an obtuse wave or a stepped waveform as shown in FIG. 21, or may be a waveform obtained by combining a plurality of ramp waveforms, an obtuse wave, and a stepped wave. It is only necessary to have a ramp with a voltage change rate of 0.1 IV / ⁇ sec or more and 10VZ ⁇ sec or less.
- Write period 32 :
- a cell to be lit by the write discharge is selected. That is, the scan electrodes SCN1 to n are applied with scan pulses of a voltage lower than the address electrodes D1 to m and the sustain electrodes SUS1 to SUSn, and are applied only to the address electrodes of the discharge cells to be lit.
- An address discharge is caused by applying an address noise at a voltage Vw such that a voltage difference of the same sign as the wall potential is generated between the address electrode and the address electrode.
- a sustain pulse is applied to scan electrodes SCN 1 to n and sustain electrodes SUS 1 to n, and a sustain operation is performed in which light emission is maintained only in the cells that have undergone the write discharge in write period 32. That is, first, a positive sustain pulse is applied to scan electrodes SCN1 to n to cause discharge, and then intermittently by applying sustain pulses so that the polarity is alternately switched between scan electrodes SCN1 to n and sustain electrodes SUS1 to n. To keep the luminescence.
- Erasure period 34 In the erasing period 34, an erasing operation is performed in which the erasing discharge is selectively generated only in the discharge cells that have undergone the sustaining operation in the immediately preceding sustaining period to erase the wall charges. In the erasing period 34, an incomplete discharge is generated by applying an erasing voltage having a narrow phase difference time width with respect to the scanning electrodes SCN1 to n to the sustain electrodes SUS1 to n, thereby partially eliminating the wall charges. Prepare for SF initialization.
- FIG. 3 is a block diagram showing the configuration of the display driving unit.
- This drive unit includes scan electrode drive circuit 21, sustain electrode drive circuit 22, address electrode drive circuit 23, timing generator 24, AZD (AnalogZDigital) converter 25, scan number converter 26, subfield converter 27, APL ( Equipped with an Averaged Picture Level detection unit 28 and the like.
- the video signal VD is input to the AZD conversion unit 25, and the horizontal synchronization signal H and the vertical synchronization signal V are input to the AZD conversion unit 25, the scan number conversion unit 26, and the subfield conversion unit 27.
- the vertical sync signal V is also input to the timing generator 24.
- the AZD conversion unit 25 converts the input video signal VD into digital signal image data, and outputs the converted image data to the scan number conversion unit 26 and the APL detection unit 28.
- the scanning number conversion unit 26 converts the image data received from the AZD conversion unit 25 into image data corresponding to the number of pixels of the PDP 1 and outputs the image data to the subfield conversion unit 27.
- the sub-field conversion unit 27 includes a sub-field memory (not shown), and turns on the discharge cells in each sub-field to display the image data transferred from the scanning number conversion unit 26 on the PDP 1 with gradation. It is converted into subfield data, which is a set of binary data indicating non-lighting, and stored in the subfield memory. Then, the subfield data is output to the scan electrode drive circuit 21 based on the timing signal from the timing generator 24.
- the APL detection unit 28 detects the average luminance level of the image data.
- the drive unit can be used to control the drive waveform based on the detected average luminance level.
- the timing generator 24 opens the field when the vertical sync signal V force has reached a certain time. A start signal is generated, and a timing signal for instructing the start of the initialization period, the writing period, and the sustain period of each subfield is generated starting from this field start signal. Furthermore, by counting the clocks starting from the timing signal that instructs the start of each period, a timing signal that indicates the timing of pulse generation is generated for each drive circuit 21 to 23, and these various timing signals are Output to circuits 21-23.
- the timing generator 24 stores the starting force of each subfield as well as the time until each pulse rising force S and the set time until the pulse falling are converted into the number of clocks CLK. Simultaneously with the start of the subfield, the time counter CT is reset, and when the time counter CT reaches each set time, the drive circuits 21 to 23 are instructed to rise or fall.
- Each of the drive circuits 21 to 23 includes a known driver IC and the like, and applies a drive pulse to the PDP 1 based on the timing signal sent from the timing generator 24 as follows. Based on the timing signal sent from the timing generator 24, the scan electrode drive circuit 21 applies a scan pulse with an amplitude Vh (V), a sustain pulse with an amplitude Vm (V) to the scan electrodes SCN1 to n. Apply.
- Sustain electrode drive circuit 22 applies a sustain pulse of amplitude Vm (V) to sustain electrodes SUSl to SUSn based on the timing signal sent from timing generator 24.
- the address electrode drive circuit 23 applies address pulses to the address electrodes Dl to m selected based on the subfield data in accordance with the timing signal sent from the timing generator 24 during the writing period. Apply.
- the address electrode driving circuit 23 has a sustain period in the preceding subfield after the writing period of the subfield has ended. If it is provided, after the sustain period ends, the address electrodes Dl to m are applied to the address electrodes Dl to m based on the timing signal sent from the timing generator 24 in advance of the ramp waveform portion S1 in the initialization period. Priming operation is performed by applying priming pulses in a batch. The priming pulse is preferably applied at the beginning of the initialization period or before the initialization period.
- FIG. 7 shows only the all-cell initializing period 31 of the IS.F.
- the address pulses Dl to m are the same as the initialization pulse. Apply a polarity priming pulse (voltage Vpr).
- sustain electrodes SUSl to n are held at ground potential O (V) as described above, sustain electrodes SUSl to n have a negative voltage with respect to address electrodes Dl to m. Therefore, in the vicinity of the sustain electrodes SUSl to n, electrons having a large secondary electron emission coefficient compared to the phosphor layer 16 are emitted from the protective layer 18 to the discharge space 20 to generate a priming discharge.
- the falling time of the priming pulse is preferably substantially the same as or before the start point t3 of the ramp waveform portion S1. The reason is as follows.
- the priming noise is applied to the address electrodes D1 to m while the ramp waveform portion S1 of the initialization pulse is applied, the potential difference between the scan electrode and the address electrode becomes small, and the initialization pulse is initialized.
- the wall charge formation due to the operation cannot be sufficiently performed, and the subsequent writing operation cannot be normally performed.
- the falling edge of the priming pulse is almost the same as or before the start point t3 of the ramp waveform portion S1, the potential difference between the scan electrode and the address electrode is initialized. It is held at the potential difference desired for operation. Accordingly, the wall charge formation in the initialization operation is not hindered by the application of the priming pulse.
- the priming discharge itself tends to be a strong discharge
- the priming discharge is generated between the sustain electrodes SUSl to n and the address electrodes D1 to m, the scan electrodes SCN1 to n are not directly involved in the priming discharge. Therefore, the priming discharge itself is not likely to be a strong discharge.
- the voltage Vpr of the priming pulse may be set to the same magnitude as the voltage Vw of the address pulse, but is preferably set within a range suitable for priming discharge separately from the voltage Vw.
- the magnitude of the voltage Vpr of the priming pulse is preferably set to be equal to or higher than the threshold voltage at which discharge starts between the sustain electrodes SUSl to n and the address electrodes Dl to m in order to reliably generate priming discharge. ,.
- the voltage Vpr of the priming pulse is 0.1 lVf or more and less than Vf (where Vf starts discharge between the scan electrodes SCN1 to n and any of the sustain electrodes SUSl to n and address electrodes D1 to m) Since the light emission associated with the priming discharge can be suppressed, the contrast ratio can be improved. In particular, if the voltage Vpr of the priming pulse is set to 0.5 Vf or more and less than Vf, both the effect of suppressing light emission due to the priming operation and the effect of suppressing the strong discharge by the priming operation can be expected.
- the magnitude of the priming norse voltage Vpr is less than Vmin when the maximum value of the voltage applied to the scanning electrodes SCN1 to n is Vmax and the minimum value is Vmin during the all-cell initialization period 31.
- the statistical composition time Ts of the discharge start time during the write operation is changed by changing the material composition and electrode arrangement of the protective layer constituting the panel, and an effect confirmation experiment is performed on the statistical dispersion time Ts. It was.
- Voltage slope is the time variation of the voltage applied to the electrode, and the slope of this voltage is adjusted by the circuit configuration that combines the p-type semiconductor, MOSFET, and volume resistance.
- APD near-infrared photodiode
- Figure 13 shows an example of the APD output waveform when a weak discharge is normally generated during the all-cell initialization period.
- FIG. 14 shows an example of an APD output waveform when a strong discharge occurs during the all-cell initialization period.
- Limit slope is an index of the likelihood of a strong discharge. When the limit slope is large, it means that strong discharge is likely to occur when the limit slope that is difficult to generate strong discharge is small.
- Figure 20 shows the measurement results of the ramp voltage limit slope of the initialization operation in the driving methods of Conventional Example 1 and Example 1, and plots the limit slope for each statistical variation time Ts of the discharge start time. And then.
- the statistical variation time Ts is related to the probability of causing a strong discharge, and the probability of causing a strong discharge increases as the statistical variation time Ts increases. That is, the statistical variation time Ts of the discharge start time depends on the material surrounding the discharge space 20 and the electrode arrangement, and the surface force of the material surrounding the discharge space 20 is also insufficient when electrons supplied to the discharge space 20 are insufficient. In this case, the electron number density becomes insufficient inside the discharge space 20, and a region where a strong electric field is applied occurs sparsely in time and space. As a result, sudden ionization multiplication tends to occur irregularly, so that the statistical variation time Ts of the discharge start time increases, but the probability of causing a strong discharge is further increased.
- the electron number density increases in the discharge space 20, and thus there is a probability of causing a strong discharge. It is considered to be kept low.
- FIG. 22 is a diagram illustrating an example of a circuit for generating a priming noise
- FIG. 23 is a timing chart for explaining the operation thereof.
- the timing generator 24 generates priming pulses using the circuit shown in FIG.
- this circuit includes a one-shot multi-layer Ml that generates pulses with a predetermined time constant, AND circuits Al, A2, A3, counters CT1, CT2, and a flip-flop circuit FF.
- the vertical sync signal Vsync is input to the one-shot multi Ml.
- each video field starts from the vertical synchronization signal Vsync, and the one-shot multi-Ml pulse rises by the vertical synchronization signal Vsync.
- the synchronization signal Vsync may be given to the one-shot multi Ml through a delay circuit corresponding to the delay amount.
- the time constant of the one-shot multi-Ml should be set to an appropriate time within the time of one field.
- P1 indicates a pulse generated by the one-shot multi Ml
- CLK indicates a clock pulse
- Vsync indicates a vertical synchronization signal.
- the AND circuits Al and A2 open the gates until the one-shot multi-Ml generates the pulse P1 and the counters CT1 and CT2 count the respective maximum counts.
- the pulse is supplied to the counters CT1 and CT2.
- the maximum count number of the counter CT1 (hereinafter referred to as “first set value”) is set to a count number corresponding to the time from the opening of the AND circuit A gate to t2 when the priming norse rises.
- the maximum CT2 count (hereinafter referred to as “second set value”) is set to the count corresponding to the time from when the gate of AND circuit A2 opens until t3 when the priming pulse falls.
- an address pulse (voltage Vw) is applied to the address electrodes Dl to m during the writing period, and priming is performed at a voltage Vpr different from the voltage Vw during the priming period.
- Vw voltage
- Vpr voltage
- FIGS. 15 and 16 are diagrams showing the configuration of the address electrode drive circuit 23, in which two types of power supplies P Wl (voltage Vw) and PW2 (voltage Vpr) are provided, and output can be output to the address electrodes Dl to m with the voltage Vw and the voltage Vpr by controlling the output by separate systems.
- a negative switching element Ta and a low-side switching element Tb are connected in series between the power supply terminal (Vw) and ground 0 (V).
- a protection diode Db in parallel with the side switching element is removed, and an address electrode drive circuit DD is inserted in which a protection diode Da is inserted to prevent backflow from the power supply PW2 to the power supply PW1.
- the element Ta is controlled, and the low-side switching element Tb is controlled by the control terminal L1.
- Address electrode drive circuit DD is similar to the address electrode drive circuit conventionally used for PDP, and receives subfield data from subfield conversion unit 27, and address electrodes D1 to m The address pulse Vw is stamped from the power supply PW1 to the one selected based on the subfield data!
- the address electrode drive circuit DD has a circuit configuration in which a power supply PW2 for outputting a voltage Vpr for performing a priming operation and a switching element Tc for controlling the output are added before the output terminal Vout. is there.
- V is applied to the address electrode drive circuit portion DD and the high-side switching element Ta with the switching element Tc turned OFF at the control terminal SW.
- the address pulse of voltage Vw is applied to the address electrode by the ONZOFF operation of the low-side switching element Tb.
- the priming pulse of the voltage Vpr is applied by turning on the switching element Tc with the high-side switching element Ta and the low-side switching element Tb turned off.
- FIG. 16 shows a circuit configuration in which the low side of the address electrode drive circuit unit DD is shelved by the voltage Vw from the ground potential 0 (V).
- This circuit includes a combination circuit A in which a high-side switching element Ta and a low-side switching element Tb are connected in series between the voltage Vpr and ground 0 (V).
- the output terminal of the combination circuit A and the power supply PW1 The capacitor C for the charge pump, the switching element Tc for adjusting the timing of the ground potential shelf, and the backflow prevention A combinational circuit B with diode Da is inserted.
- the charge pump capacitor C is an example, and it may be a circuit that stably outputs the voltage Vw, such as a DC-DC converter.
- combination circuit A is connected to the low side of address electrode drive circuit DD, and the output of combination circuit B is connected to the other side of address electrode drive circuit DD.
- the priming is performed by setting the sustain electrodes SUSl to n to the ground potential 0 (V) and applying the positive voltage Vpr to the address electrodes Dl to m.
- the voltage applied to the address electrodes Dl to m and the sustain electrodes SUS 1 to n is not limited to this, but the address electrodes D1 to m and the sustain electrodes SUSl to If a potential difference that can supply charged particles to the discharge space can be formed with n, the same effect can be obtained.
- the sustain electrodes SUSl to n may be set to the ground potential 0 (V), and the address electrodes Dl to m may be floated.
- V ground potential
- the address electrodes D1 to m that are in the floating state also have a positive potential
- priming discharge can be generated.
- a force for applying a priming pulse of the positive voltage Vpr to the address electrodes Dl to m can be set to an arbitrary value existing before the priming period 35.
- the minimum voltage of the initialization pulse is set low (the absolute value I Vbt I of the negative voltage is increased).
- FIG. 9 is a timing chart of drive waveforms according to the third embodiment, and shows only the vicinity of the all-cell initializing period 31.
- the priming period 35 (tl2 to tl2 ⁇ ) is reached from the time til when the previous TV field ends and the 1TV field starts to the start point tl4 of the IS.F.all-cell initialization period. tl3), and during the priming period 35, a positive voltage Vprl priming pulse is applied to the address electrodes Dl to m, and a negative voltage Vpr2 priming pulse is applied to the sustain electrodes SUS1 to SUSn, so A voltage (Vp rl -Vpr2) is formed between SUSl and SUSl to perform priming discharge.
- a positive voltage (Vp rl) priming pulse is applied to the address electrodes Dl to m, and a negative voltage (Vpr2) priming pulse is applied to the sustain electrodes SUSl to n. Apply ⁇ ⁇ .
- all the sustain electrodes SUSl to n are lowered from the positive potential Ve to the ground potential O (V) at the field start time til. Then, at the starting time tl2 of the priming period, the potentials of all the address electrodes Dl to m are also raised to the ground potential 0 (V) force to the positive potential Vprl. At the same time, a voltage that drops to the ground potential OV force negative potential Vpr2 is applied to all the sustain electrodes SUSl to n. At the end of the priming period tl3, the potentials of the address electrodes Dl to m and the sustain electrodes SUSl to n are returned to the ground potential 0 (V).
- the voltage (Vprl ⁇ Vpr2) is generated between the address electrodes D1 to m and the sustain electrodes SUS1 to n. ) Is formed, and priming discharge is generated.
- the voltage Pr formed between the address electrodes Dl to m and the sustain electrodes SUSl to n during the priming period is (Vprl-Vpr2) and becomes
- the positive voltage Vprl and the negative voltage Vpr2 of the priming pulse are equal to or higher than the threshold voltage at which discharge starts between the voltage (Vprl-Vpr2) force sustaining electrodes SUS 1 to n and the address electrodes D 1 to m. It is preferable to set so that the priming discharge is generated reliably.
- the voltage (Vprl-Vpr2) is 0.1 lVf or more and less than Vf (however, Vf starts discharge between the scan electrodes SCN1 to n and any of the sustain electrodes SUSl to n and address electrodes Dl to m) If the threshold voltage is set, the light emission associated with the priming discharge can be suppressed, so that the contrast ratio can be improved.
- FIG. 17 shows the configuration of the sustain electrode driving circuit 22 for applying the sustain pulse of the positive voltage Vm to the sustain electrodes SUSl to n during the sustain period and the priming pulse of the negative voltage Vpr2 during the priming period.
- Each of the circuits shown in FIGS. 17 to 19 is a diagram illustrating an example of the sustain electrode drive circuit according to the third embodiment, and each sustain electrode drive circuit is a power source for outputting a positive sustain pulse.
- PW1 positive voltage Vm
- PW2 negative voltage Vpr2
- the circuit shown in FIG. 17 includes a circuit E in which a negative switching element Ta and a low-side switching element Tb are connected in series between the power supply PWl (Vm) and the ground terminal.
- the output terminal of the circuit E and the power supply PW2 A circuit F in which a high-side switching element Tc and a low-side switching element Td are connected in series is connected to (Vpr2).
- a negative voltage priming pulse is output by controlling the switching elements Tc and Td of the separation circuit F with the one-side switching element Tb turned on.
- a positive sustain pulse can be applied to the sustain electrodes SUSl to SUSn in the sustain period, and a negative priming pulse can be applied in the priming period.
- the circuit shown in FIG. 18 includes a circuit E that outputs a sustain pulse (voltage Vm), and a switching element Tc and a diode Dc are interposed between the output terminal Vout and the power supply Vpr.
- the negative voltage priming pulse is controlled by controlling the switching elements Tc and Td of the separation circuit F while the non-side switching element Ta and the low-side switching element Tb of the circuit E are turned off. Is output.
- a positive sustain pulse can be applied to sustain electrodes SUSl to SUSl-n during the sustain period, and a negative priming pulse can be applied during the priming period.
- the circuit shown in FIG. 19 includes a circuit F in which a high-side switching element Tc and a low-side switching element Td are connected in series between a ground terminal 0 (V) and a power supply PW4 (negative voltage Vpr2).
- a circuit E in which a high-side switching element Ta and a low-side switching element Tb are connected in series, is connected in series between the power supply Vm and the power supply Vm.
- the switching element T in the circuit F is turned on in the state in which the negative switching element Tc of the circuit E is turned off and the one-side switching element Td is turned on.
- a negative voltage priming pulse is output by controlling c and Td.
- FIG. 10 is a timing chart of drive waveforms according to the fourth embodiment, which is the same as the third embodiment. However, in the priming period 35, the ground potential is 0 with respect to the sustain electrodes SUSl to n.
- a ramp voltage is also applied that causes the V force to slowly fall.
- the pulse applied to the sustain electrodes SUSl to n in the priming period is a ramp waveform (the address electrodes Dl to m are set to the positive voltage Vpr
- the sustain electrodes SUSl to n are gradually lowered to the ground potential OV force negative potential Vpr2 while being held at 1), so that light emission due to priming discharge can be suppressed and the contrast ratio can be kept good.
- a ramp waveform that gently returns at the end of the priming noise is provided in order to suppress erroneous discharge due to a rapid voltage change after the priming discharge.
- the address electrodes Dl to m are positively connected. Priming operation is performed by applying a priming pulse of voltage Vpr.
- FIG. 11 is a timing chart of drive waveforms that are used in the fifth embodiment, and shows from the first IS. F to the second second S. F in the 1TV field.
- the scan electrodes SCN1 to n are ramps that gradually fall from the voltage Vq (V) to the voltage Vbt (V).
- a selective initialization pulse having a waveform portion S3 (t24 to t25) is applied, the sustain electrodes SUS1 to SUSn are held at the voltage Vh (V), and the address electrodes D1 to m are held at the ground potential O (V).
- a weak initializing discharge is selectively generated in the discharge cell that has undergone the sustain discharge in the IS. F., and is adjusted to a wall charge suitable for the address operation.
- the priming period 35 is set between the time t21 when the second S.F. following the erase period 34 of the IS.F. starts and the ramp waveform portion S3 start time t24 of the selective initialization period 36.
- a positive voltage Vpr priming pulse is applied to the address electrodes Dl to m, and the potential of the sustain electrodes SUSl to n is lowered from the positive voltage Vr to OV. Accordingly, during the priming period 35, the voltage of the address electrodes Dl to m becomes Vpr with respect to the sustain electrodes SUSl to n, and priming discharge is generated.
- This embodiment also has basically the same effect as the all-cell initialization described in the first embodiment.
- the priming discharge is generated before the ramp waveform portion of the selective initialization period 36
- the charged particles are sufficiently supplied to the discharge space 20 as described in the first embodiment. Therefore, weak discharge is likely to occur during the initialization operation. Therefore, it is possible to suppress the occurrence of a strong discharge between the scan electrode and the sustain electrode, as well as to suppress the occurrence of a strong discharge between the scan electrode and the address electrode.
- the priming discharge is generated between the address electrodes Dl to m and the sustain electrodes SUSl to n, the scan electrodes SCN1 to n do not directly participate in the priming discharge. Therefore, the priming discharge itself is not likely to be a strong discharge!
- the magnitude of the voltage Vpr of the priming pulse is the same as that of the sustain electrodes SUSl to n. It is preferable to set the voltage higher than the threshold voltage at which discharge starts between the less electrodes Dl to m, in order to reliably generate priming discharge.
- the voltage Vpr of the priming pulse is 0.1 lVf or more and less than Vf (where Vf is the threshold voltage at which discharge starts between the scan electrodes SCN1 to n and any of the sustain electrodes SUSl to n and address electrodes D1 to m) ),
- Vf is the threshold voltage at which discharge starts between the scan electrodes SCN1 to n and any of the sustain electrodes SUSl to n and address electrodes D1 to m
- the address electrodes Dl to m may be floated in the priming period 35. Since the positive voltage Vq (V) is applied to the scanning electrodes SCN1 to n during the priming period 35, the address electrodes D1 to m that are in the floating state are also set to the positive potential and are connected to the sustain electrodes SUS1 to n. Since a potential difference is formed in, priming discharge can be generated.
- the priming pulse is applied before the ramp waveform portion S3 of the selected initial pulse is started. Similarly, a strong discharge suppressing effect can be obtained.
- the priming pulse is not applied to the address electrodes Dl to m in the IS.F., but the priming pulse is also applied in the IS.F. as described in Examples 1 to 4. It is preferable to suppress the occurrence of strong discharge during the all-cell initialization period 31 by applying.
- the priming period 35 is set after the immediately preceding SF erasing period 34 ends, but during or before the erasing operation for erasing the charge formed in the discharge space 20 by the immediately preceding SF.
- a priming pulse may be applied.
- FIG. 12 is a timing chart of drive waveforms according to the sixth embodiment.
- the ramp waveform disappears before the ramp waveform portion that gradually falls from the voltage Vq (V) to the voltage Vbt (V) in the selective initialization period 36.
- An erasure period 34 for leaving is provided.
- a brimming period 35 is provided immediately before the deactivation period 34.
- a priming discharge between the scan electrodes SCN1 to n to which the initialization pulse is applied that is, between the sustain electrodes SUS1 to n and the address electrodes D1 to m. It is not necessarily limited to between the sustain electrodes SUSl to n and the address electrodes D1 to m, but in addition to mainly generating a priming discharge between the sustain electrodes SUS1 to n and the address electrodes D1 to m. Priming discharge may also be generated between scan electrodes SCN1-n and address electrodes D1-m, and between scan electrodes SCN1-n and sustain electrodes SUS1-n.
- the form of applying a voltage to the address electrodes Dl to m and the sustain electrodes SUSl to n is not limited to that described in the above embodiment, and in the priming period 35, the address electrodes D1 to m If a potential difference capable of supplying charged particles to the discharge space can be formed between the sustain electrodes SUS1 to SUSn, the same effect can be obtained.
- the driving method according to the present invention is not limited to the surface discharge type, and can be applied to a counter discharge type PDP in which a counter electrode is formed between partition walls. Similar effects can be expected.
- the PDP driving method and the driving device it is possible to eliminate the occurrence of strong discharge in the initialization operation by the priming operation before the initialization operation, and to display an image with good image quality. Therefore, it is useful for an image display device such as a television.
- high-precision PDPs or high xenon partial pressures are highly effective when applied to PDPs, making them suitable for full-spec high-vision PDPs and PDPs with high luminous efficiency.
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Description
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WO2009013862A1 (ja) * | 2007-07-25 | 2009-01-29 | Panasonic Corporation | プラズマディスプレイ装置およびその駆動方法 |
WO2009034681A1 (ja) * | 2007-09-11 | 2009-03-19 | Panasonic Corporation | 駆動装置、駆動方法およびプラズマディスプレイ装置 |
WO2010143403A1 (ja) * | 2009-06-08 | 2010-12-16 | パナソニック株式会社 | プラズマディスプレイパネルの駆動方法およびプラズマディスプレイ装置 |
WO2010143404A1 (ja) * | 2009-06-08 | 2010-12-16 | パナソニック株式会社 | プラズマディスプレイパネルの駆動方法およびプラズマディスプレイ装置 |
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TW200926107A (en) * | 2007-12-10 | 2009-06-16 | Richtek Technology Corp | A row driving cells of electroluminescent display and the method thereof |
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- 2007-05-01 JP JP2008514465A patent/JP4388995B2/ja not_active Expired - Fee Related
- 2007-05-01 WO PCT/JP2007/059309 patent/WO2007129641A1/ja active Application Filing
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WO2008069209A1 (ja) * | 2006-12-05 | 2008-06-12 | Panasonic Corporation | プラズマディスプレイ装置およびその駆動方法 |
WO2009013862A1 (ja) * | 2007-07-25 | 2009-01-29 | Panasonic Corporation | プラズマディスプレイ装置およびその駆動方法 |
US8570248B2 (en) | 2007-07-25 | 2013-10-29 | Panasonic Corporation | Plasma display device and method of driving the same |
WO2009034681A1 (ja) * | 2007-09-11 | 2009-03-19 | Panasonic Corporation | 駆動装置、駆動方法およびプラズマディスプレイ装置 |
US8471785B2 (en) | 2007-09-11 | 2013-06-25 | Panasonic Corporation | Driving device, driving method and plasma display apparatus |
WO2010143403A1 (ja) * | 2009-06-08 | 2010-12-16 | パナソニック株式会社 | プラズマディスプレイパネルの駆動方法およびプラズマディスプレイ装置 |
WO2010143404A1 (ja) * | 2009-06-08 | 2010-12-16 | パナソニック株式会社 | プラズマディスプレイパネルの駆動方法およびプラズマディスプレイ装置 |
EP2413307A1 (en) * | 2009-06-08 | 2012-02-01 | Panasonic Corporation | Plasma display panel drive method and plasma display device |
CN102460545A (zh) * | 2009-06-08 | 2012-05-16 | 松下电器产业株式会社 | 等离子显示面板的驱动方法以及等离子显示装置 |
EP2413307A4 (en) * | 2009-06-08 | 2012-08-15 | Panasonic Corp | DRIVE PROCESS FOR A PLASMA DISPLAY PANEL AND PLASMA DISPLAY DEVICE |
JP2012155331A (ja) * | 2009-06-08 | 2012-08-16 | Panasonic Corp | プラズマディスプレイパネルの駆動方法およびプラズマディスプレイ装置 |
JP5126418B2 (ja) * | 2009-06-08 | 2013-01-23 | パナソニック株式会社 | プラズマディスプレイパネルの駆動方法およびプラズマディスプレイ装置 |
Also Published As
Publication number | Publication date |
---|---|
US20090079720A1 (en) | 2009-03-26 |
JPWO2007129641A1 (ja) | 2009-09-17 |
JP4388995B2 (ja) | 2009-12-24 |
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