WO2010029665A1 - プラズマディスプレイ装置およびプラズマディスプレイパネルの駆動方法 - Google Patents
プラズマディスプレイ装置およびプラズマディスプレイパネルの駆動方法 Download PDFInfo
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- WO2010029665A1 WO2010029665A1 PCT/JP2009/002487 JP2009002487W WO2010029665A1 WO 2010029665 A1 WO2010029665 A1 WO 2010029665A1 JP 2009002487 W JP2009002487 W JP 2009002487W WO 2010029665 A1 WO2010029665 A1 WO 2010029665A1
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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
- G09G3/293—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 address 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
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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
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0202—Addressing of scan or signal lines
- G09G2310/0218—Addressing of scan or signal lines with collection of electrodes in groups for n-dimensional addressing
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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
- G09G2320/0228—Increasing the driving margin in plasma displays
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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
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/66—Transforming electric information into light information
Definitions
- the present invention relates to a plasma display device and a plasma display panel driving method used for a wall-mounted television or a large monitor.
- a typical AC surface discharge type panel as a plasma display panel (hereinafter abbreviated as “panel”) has a large number of discharge cells formed between a front plate and a back plate arranged to face each other.
- a plurality of display electrode pairs each consisting of a pair of scan electrodes and sustain electrodes are formed in parallel with each other on the front glass substrate, and a dielectric layer and a protective layer are formed so as to cover the display electrode pairs.
- the back plate has a plurality of parallel data electrodes on the back glass substrate, a dielectric layer so as to cover them, and a plurality of barrier ribs in parallel with the data electrodes formed on the back glass substrate.
- a phosphor layer is formed on the side walls of the barrier ribs. Then, the front plate and the back plate are arranged opposite to each other so that the display electrode pair and the data electrode are three-dimensionally crossed and sealed, and a discharge gas containing, for example, 5% xenon is enclosed in the internal discharge space.
- a discharge cell is formed at a portion where the display electrode pair and the data electrode face each other. In the panel having such a configuration, ultraviolet rays are generated by gas discharge in each discharge cell, and the phosphors of red (R), green (G) and blue (B) colors are excited and emitted by the ultraviolet rays, thereby performing color display. It is carried out.
- the subfield method is generally used as a method for driving the panel.
- the brightness obtained by one light emission is not controlled, but the brightness is adjusted by controlling the number of times of light emission generated per unit time (for example, one field). That is, in the subfield method, one field is divided into a plurality of subfields, and gradation display is performed by causing each discharge cell to emit light or not emit light in each subfield.
- Each subfield has an initialization period, an address period, and a sustain period.
- an initialization waveform is applied to each scan electrode, and an initialization discharge is generated in each discharge cell.
- wall charges necessary for the subsequent address operation are formed in each discharge cell, and priming particles (excited particles for generating the address discharge) for stably generating the address discharge are generated.
- a scan pulse is sequentially applied to the scan electrode (hereinafter, this operation is also referred to as “scan”), and an address pulse corresponding to an image signal to be displayed is selectively applied to the data electrode (hereinafter, referred to as “scan”).
- scan sequentially applied to the scan electrode
- scan an address pulse corresponding to an image signal to be displayed
- write selectively applied to the data electrode
- a predetermined number of sustain pulses corresponding to the luminance to be displayed are alternately applied to the display electrode pair composed of the scan electrode and the sustain electrode.
- a sustain discharge is generated in the discharge cell in which the wall charge is formed by the address discharge, and the phosphor layer of the discharge cell is caused to emit light. In this way, an image is displayed in the image display area of the panel.
- an all-cell initializing operation for generating an initializing discharge in all discharge cells is performed, and initializing of other subfields is performed.
- the data electrode driving circuit performs an address operation in which an address pulse voltage is applied to the data electrode to generate an address discharge in the discharge cell, but the power consumption at the time of writing is equal to the rated value of the IC constituting the data electrode driving circuit. If it exceeds the maximum value, the IC malfunctions, and there is a possibility that an address failure such as an address discharge not occurring in a discharge cell that should generate an address discharge or an address discharge occurring in a discharge cell that should not generate an address discharge may occur. Therefore, in order to suppress the power consumption at the time of writing, a method for predicting the power consumption of the data electrode driving circuit based on the image signal to be displayed and limiting the gradation when the predicted value exceeds a set value is disclosed. (For example, refer to Patent Document 1).
- the address discharge is generated by applying the scan pulse voltage to the scan electrode and applying the address pulse voltage to the data electrode. Therefore, it is difficult to perform a stable address operation only with the technique for stabilizing the operation of the data electrode driving circuit disclosed in Patent Document 1, and the operation in the circuit for driving the scan electrode (scan electrode driving circuit) is stabilized. Technology to achieve this is also important.
- the scan pulse voltage is sequentially applied to the scan electrodes in the address period, the time spent in the address period becomes longer due to the increase in the number of scan electrodes, particularly in a high-definition panel. End up. Therefore, in the discharge cell in which the address operation is performed at the end of the address period, the disappearance of the wall charge is increased and the address discharge is likely to be unstable compared to the discharge cell in which the address operation is performed at the beginning of the address period. There was also a problem.
- the plasma display apparatus includes a plurality of subfields having an initialization period, an address period, and a sustain period in one field, sets a luminance weight for each subfield, and sets a number corresponding to the luminance weight in the sustain period.
- a sustain pulse is generated by a sub-field method for generating grayscale display, a panel having a plurality of discharge cells each having a display electrode pair composed of a scan electrode and a sustain electrode, and a scan pulse is applied to the scan electrode during an address period Then, the scanning electrode driving circuit for performing the address operation and the display area of the panel are divided into a plurality of areas, and for each area, the ratio of the number of discharge cells to be lit with respect to the total number of discharge cells is set as a partial lighting rate for each subfield.
- a partial lighting rate detection circuit that detects each time, and the scan electrode driving circuit performs a first initialization operation in the initialization period and an address period
- the second initialization operation is performed, the address operation in the region where the partial lighting rate detected by the partial lighting rate detection circuit is the largest is performed immediately after the first initialization operation, and the second region in which the partial lighting rate is the highest.
- the writing operation is performed immediately after the second initialization operation.
- the addressing operation can be performed with a shorter elapsed time until the scan pulse voltage (amplitude) required to generate stable address discharge is prevented even in panels with larger screens and higher definition. Thus, stable address discharge can be generated, and the image display quality of the panel can be improved.
- FIG. 1 is an exploded perspective view showing the structure of the panel according to Embodiment 1 of the present invention.
- FIG. 2 is an electrode array diagram of the panel.
- FIG. 3 is a drive voltage waveform diagram applied to each electrode of the panel.
- FIG. 4 is a circuit block diagram of the plasma display device in accordance with the first exemplary embodiment of the present invention.
- FIG. 5 is a circuit diagram showing a configuration of a scan electrode driving circuit of the plasma display device.
- FIG. 6 is a schematic diagram showing an example of the connection between the region for detecting the partial lighting rate and the scan IC in Embodiment 1 of the present invention.
- FIG. 7 is a schematic diagram showing an example of the order of the write operation of the scan IC in the first embodiment of the present invention.
- FIG. 8 is a characteristic diagram showing the relationship between the order of address operations of the scan IC and the scan pulse voltage (amplitude) necessary for generating a stable address discharge in the first embodiment of the present invention.
- FIG. 9 is a characteristic diagram showing the relationship between the partial lighting rate and the scan pulse voltage (amplitude) necessary for generating a stable address discharge in Embodiment 1 of the present invention.
- FIG. 10 is a circuit block diagram showing a configuration example of the scan IC switching circuit according to the first embodiment of the present invention.
- FIG. 11 is a circuit diagram showing a configuration example of the SID generation circuit according to the first embodiment of the present invention.
- FIG. 12 is a timing chart for explaining the operation of the scan IC switching circuit according to the first embodiment of the present invention.
- FIG. 13 is a circuit diagram showing another configuration example of the scan IC switching circuit according to Embodiment 1 of the present invention.
- FIG. 14 is a timing chart for explaining another example of the scan IC switching operation in the first embodiment of the present invention.
- FIG. 15 is a diagram schematically illustrating a light emission state in a low subfield when a predetermined image is displayed by performing a writing operation in an order corresponding to the partial lighting rate.
- FIG. 16 schematically shows a light emission state in the low subfield when an image similar to the display image shown in FIG. 15 is displayed by performing an address operation in order from the scanning electrode at the upper end of the panel toward the scanning electrode at the lower end of the panel.
- FIG. 17 is a circuit block diagram of the plasma display device in accordance with the second exemplary embodiment of the present invention.
- FIG. 18 is a waveform diagram of drive voltage applied to each electrode of the panel in the third embodiment of the present invention.
- FIG. 19 shows the relationship between the scan pulse voltage (amplitude) necessary for generating a stable address discharge and the order of the address operation and the scan electrodes SC1 to SC3 when performing two-phase driving in the third embodiment of the present invention. It is a figure which shows roughly the drive voltage waveform applied to the electrode SCn.
- FIG. 20 is a schematic diagram showing an example of the scanning order (an example of the order of the writing operation of the scanning IC) according to the partial lighting rate when displaying a predetermined image in the third embodiment of the present invention by the two-phase drive.
- FIG. 21 is a circuit diagram of a scan electrode driving circuit according to the third embodiment of the present invention.
- FIG. 22 is a diagram for explaining a correspondence relationship between the control signals OC1 'and OC2 and the operation state of the scan IC according to the third embodiment of the present invention.
- FIG. 23 is a timing chart for explaining an example of the operation of the scan electrode driving circuit according to Embodiment 3 of the present invention.
- FIG. 1 is an exploded perspective view showing the structure of panel 10 according to Embodiment 1 of the present invention.
- a plurality of display electrode pairs 24 each including a scanning electrode 22 and a sustain electrode 23 are formed on a glass front plate 21.
- a dielectric layer 25 is formed so as to cover the scan electrode 22 and the sustain electrode 23, and a protective layer 26 is formed on the dielectric layer 25.
- the protective layer 26 has been used as a panel material in order to lower the discharge start voltage in the discharge cell, and has a large secondary electron emission coefficient and durability when neon (Ne) and xenon (Xe) gas is sealed. It is formed from a material mainly composed of MgO having excellent properties.
- a plurality of data electrodes 32 are formed on the back plate 31, a dielectric layer 33 is formed so as to cover the data electrodes 32, and a grid-like partition wall 34 is formed thereon.
- a phosphor layer 35 that emits light of each color of red (R), green (G), and blue (B) is provided on the side surface of the partition wall 34 and on the dielectric layer 33.
- the front plate 21 and the back plate 31 are arranged to face each other so that the display electrode pair 24 and the data electrode 32 cross each other across a minute discharge space, and the outer periphery thereof is sealed with a sealing material such as glass frit. It is worn.
- a mixed gas of neon and xenon is sealed as a discharge gas in the internal discharge space.
- a discharge gas having a xenon partial pressure of about 10% is used in order to improve luminous efficiency.
- the discharge space is partitioned into a plurality of sections by partition walls 34, and discharge cells are formed at the intersections between the display electrode pairs 24 and the data electrodes 32. These discharge cells discharge and emit light to display an image.
- the structure of the panel 10 is not limited to the above-described structure, and may be, for example, provided with a stripe-shaped partition wall.
- the mixing ratio of the discharge gas is not limited to the above-described numerical values, and may be other mixing ratios.
- FIG. 2 is an electrode array diagram of panel 10 in accordance with the first exemplary embodiment of the present invention.
- the panel 10 includes n scan electrodes SC1 to SCn (scan electrodes 22 in FIG. 1) and n sustain electrodes SU1 to SUn (sustain electrodes 23 in FIG. 1) that are long in the row direction.
- M data electrodes D1 to Dm data electrodes 32 in FIG. 1) that are long in the column direction are arranged.
- M ⁇ n are formed.
- a region where m ⁇ n discharge cells are formed becomes a display region of the panel 10.
- the plasma display device in this embodiment is a subfield method, that is, one field is divided into a plurality of subfields on the time axis, luminance weights are set for each subfield, and each discharge cell is set for each subfield. It is assumed that gradation display is performed by controlling light emission / non-light emission.
- one field is composed of eight subfields (first SF, second SF,..., Eighth SF), and each subfield is 1, 2, 4, 8, 16, 32, A configuration having luminance weights of 64 and 128 can be adopted.
- an all-cell initializing operation for generating an initializing discharge in all discharge cells is performed (hereinafter, the subfield for performing the all-cell initializing operation is referred to as a subfield for performing all-cell initializing operations).
- a selective initializing operation for selectively generating initializing discharge is performed for the discharge cells that have undergone sustain discharge (hereinafter referred to as “all-cell initializing subfield”).
- all-cell initializing subfield The subfield that performs the selective initialization operation is referred to as “selective initialization subfield”), and it is possible to reduce light emission not related to gradation display as much as possible and improve the contrast ratio.
- the all-cell initialization operation is performed in the initialization period of the first SF
- the selective initialization operation is performed in the initialization period of the second SF to the eighth SF.
- the light emission not related to the image display is only the light emission due to the discharge of the all-cell initialization operation in the first SF
- the black luminance which is the luminance of the black display area that does not generate the sustain discharge, is weak in the all-cell initialization operation. Only the emission of light makes it possible to display an image with high contrast.
- the sustain period of each subfield the number of sustain pulses obtained by multiplying the luminance weight of each subfield by a predetermined proportional constant is applied to each of the display electrode pairs 24. The proportionality constant at this time is the luminance magnification.
- the number of subfields and the luminance weight of each subfield are not limited to the above values, and the subfield configuration may be switched based on an image signal or the like.
- FIG. 3 is a waveform diagram of driving voltage applied to each electrode of panel 10 in the first exemplary embodiment of the present invention.
- FIG. 3 shows drive electrodes of scan electrode SC1 that performs the address operation first in the address period, scan electrode SCn that performs the address operation last in the address period, sustain electrode SU1 to sustain electrode SUn, and data electrode D1 to data electrode Dm. Indicates.
- FIG. 3 also shows driving voltage waveforms of two subfields, that is, a first subfield (first SF) that is an all-cell initializing subfield and a second subfield (second SF) that is a selective initializing subfield. It shows.
- the drive voltage waveform in the other subfields is substantially the same as the drive voltage waveform of the second SF except that the number of sustain pulses generated in the sustain period is different.
- Scan electrode SCi, sustain electrode SUi, and data electrode Dk in the following represent electrodes selected based on image data (data indicating light emission / non-light emission for each subfield) from among the electrodes.
- the first SF which is an all-cell initialization subfield, will be described.
- 0 (V) is applied to data electrode D1 through data electrode Dm and sustain electrode SU1 through sustain electrode SUn, respectively, and sustain electrode SU1 through sustain electrode is applied to scan electrode SC1 through scan electrode SCn.
- a ramp voltage (hereinafter referred to as “up-ramp voltage”) that gradually increases (for example, at a slope of about 1.3 V / ⁇ sec) from the voltage Vi1 that is equal to or lower than the discharge start voltage to the voltage Vi2 that exceeds the discharge start voltage with respect to the electrode SUn. L1 is applied.
- positive voltage Ve1 is applied to sustain electrode SU1 through sustain electrode SUn
- 0 (V) is applied to data electrode D1 through data electrode Dm
- scan electrode SC1 through scan electrode SCn are applied to scan electrode SC1 through scan electrode SCn.
- a ramp voltage (hereinafter referred to as “down-ramp voltage”) L2 that gently decreases from voltage Vi3 that is equal to or lower than the discharge start voltage to voltage Vi4 that exceeds the discharge start voltage with respect to sustain electrode SU1 through sustain electrode SUn.
- a drive voltage waveform in which the first half of the initialization period is omitted may be applied to each electrode. That is, voltage Ve1 is applied to sustain electrode SU1 through sustain electrode SUn, and 0 (V) is applied to data electrode D1 through data electrode Dm, respectively, and a voltage that is equal to or lower than the discharge start voltage (for example, grounding) is applied to scan electrode SC1 through scan electrode SCn.
- the down-ramp voltage L4 that gently falls from the potential) toward the voltage Vi4 is applied.
- a weak initializing discharge is generated in the discharge cell that has caused the sustain discharge in the sustain period of the immediately preceding subfield (first SF in FIG.
- the initializing operation in which the first half is omitted is a selective initializing operation in which initializing discharge is performed on the discharge cells in which the sustaining operation has been performed in the sustain period of the immediately preceding subfield.
- the order of the scan electrodes 22 to which the scan pulse voltage Va is applied or the order of the write operation of the IC that drives the scan electrodes 22 is changed based on the detection result in the partial lighting rate detection circuit described later. ing. Although details will be described later, here, description will be made assuming that scan pulse voltage Va is applied sequentially from scan electrode SC1.
- voltage Ve2 is applied to sustain electrode SU1 through sustain electrode SUn
- voltage Vc is applied to scan electrode SC1 through scan electrode SCn.
- a positive write pulse voltage Vd is applied to.
- the voltage difference at the intersection between the data electrode Dk and the scan electrode SC1 is the difference between the externally applied voltage (voltage Vd ⁇ voltage Va) between the wall voltage on the data electrode Dk and the wall voltage on the scan electrode SC1.
- the difference is added and exceeds the discharge start voltage. As a result, a discharge is generated between data electrode Dk and scan electrode SC1.
- the voltage difference between sustain electrode SU1 and scan electrode SC1 is the difference between the externally applied voltages (voltage Ve2 ⁇ voltage Va).
- the difference between the wall voltage on the electrode SU1 and the wall voltage on the scan electrode SC1 is added.
- the sustain electrode SU1 and the scan electrode SC1 are not easily discharged but are likely to be discharged. Can do.
- a discharge generated between data electrode Dk and scan electrode SC1 can be triggered to generate a discharge between sustain electrode SU1 and scan electrode SC1 in a region intersecting with data electrode Dk.
- an address discharge occurs in the discharge cell to emit light, a positive wall voltage is accumulated on scan electrode SC1, a negative wall voltage is accumulated on sustain electrode SU1, and a negative wall voltage is also accumulated on data electrode Dk. Accumulated.
- the number of sustain pulses obtained by multiplying the luminance weight by a predetermined luminance magnification is alternately applied to the display electrode pair 24 to generate a sustain discharge in the discharge cell that has generated the address discharge, thereby causing light emission.
- a sustain discharge occurs between scan electrode SCi and sustain electrode SUi, and phosphor layer 35 emits light due to the ultraviolet rays generated at this time. Then, a negative wall voltage is accumulated on scan electrode SCi, and a positive wall voltage is accumulated on sustain electrode SUi. Further, a positive wall voltage is accumulated on the data electrode Dk. In the discharge cells in which no address discharge has occurred during the address period, no sustain discharge occurs, and the wall voltage at the end of the initialization period is maintained.
- sustain pulses of the number obtained by multiplying the luminance weight by the luminance magnification are applied alternately to scan electrode SC1 through scan electrode SCn and sustain electrode SU1 through sustain electrode SUn, and a potential difference is given between the electrodes of display electrode pair 24.
- the sustain discharge is continuously performed in the discharge cells that have caused the address discharge in the address period.
- a ramp voltage (hereinafter referred to as “erase ramp voltage”) L3 that gently rises from 0 (V) toward voltage Vers is applied to scan electrode SC1 through scan electrode SCn. Apply.
- erase ramp voltage As a result, a weak discharge is continuously generated in the discharge cell in which the sustain discharge is generated, and the wall voltage on the scan electrode SCi and the sustain electrode SUi is maintained while the positive wall voltage on the data electrode Dk remains. Erase part or all.
- the erase ramp voltage L3 that rises from 0 (V) that is the base potential toward the voltage Vers that exceeds the discharge start voltage is increased. It is generated with a steeper gradient (for example, about 10 V / ⁇ sec) than the ramp voltage L1, and is applied to scan electrode SC1 through scan electrode SCn. Then, a weak discharge is generated between sustain electrode SUi and scan electrode SCi of the discharge cell in which the sustain discharge has occurred. This weak discharge is continuously generated while the voltage applied to scan electrode SC1 through scan electrode SCn increases. When the increasing voltage reaches the predetermined voltage Vers, the voltage applied to scan electrode SC1 through scan electrode SCn is decreased to 0 (V) as the base potential.
- the charged particles generated by the weak discharge are accumulated as wall charges on the sustain electrode SUi and the scan electrode SCi so as to reduce the voltage difference between the sustain electrode SUi and the scan electrode SCi.
- the wall voltage between scan electrode SC1 through scan electrode SCn and sustain electrode SU1 through sustain electrode SUn remains the positive voltage applied to data electrode Dk, and the voltage applied to scan electrode SCi. It is reduced to the extent of the difference between the discharge start voltages, that is, (voltage Vers ⁇ discharge start voltage).
- the last discharge in the sustain period generated by the erase lamp voltage L3 is referred to as “erase discharge”.
- Subsequent operations in the subfield after the second SF are substantially the same as the operations described above except for the number of sustain pulses in the sustain period, and thus description thereof is omitted.
- the above is the outline of the drive voltage waveform applied to each electrode of panel 10 in the present embodiment.
- FIG. 4 is a circuit block diagram of plasma display device 1 according to the first exemplary embodiment of the present invention.
- the plasma display device 1 includes a panel 10, an image signal processing circuit 41, a data electrode drive circuit 42, a scan electrode drive circuit 43, a sustain electrode drive circuit 44, a timing generation circuit 45, a partial lighting rate detection circuit 47, and a lighting rate comparison circuit 48. And a power supply circuit (not shown) for supplying power necessary for each circuit block.
- the image signal processing circuit 41 converts the input image signal sig into image data indicating light emission / non-light emission for each subfield.
- the partial lighting rate detection circuit 47 divides the display area of the panel 10 into a plurality of areas, and the ratio of the number of discharge cells to be lit to the total number of discharge cells in each area based on the image data for each subfield. Is detected for each subfield (hereinafter, this ratio is referred to as “partial lighting rate”). For example, if the number of discharge cells in one region is 518400 and the number of discharge cells to be lit in that region is 259200, the partial lighting rate in that region is 50%.
- the partial lighting rate detection circuit 47 can also detect, for example, the lighting rate in one pair of display electrodes 24 as a partial lighting rate, but here, an IC that drives the scanning electrode 22 (hereinafter referred to as “scanning IC”). It is assumed that the partial lighting rate is detected using a region formed of a plurality of scanning electrodes 22 connected to one of the two regions as one region.
- the lighting rate comparison circuit 48 compares the partial lighting rate values of the respective regions detected by the partial lighting rate detection circuit 47 with each other, and determines which region has the largest size in descending order. . Then, a signal representing the result is output to the timing generation circuit 45 for each subfield.
- the timing generation circuit 45 generates various timing signals for controlling the operation of each circuit block based on the horizontal synchronization signal H, the vertical synchronization signal V, and the output from the lighting rate comparison circuit 48, and supplies them to the respective circuit blocks.
- Scan electrode drive circuit 43 includes an initialization waveform generating circuit (not shown) for generating an initialization waveform voltage to be applied to scan electrode SC1 through scan electrode SCn in the initialization period, and scan electrode SC1 through scan electrode in the sustain period.
- a sustain pulse generating circuit (not shown) for generating a sustain pulse to be applied to SCn, a scan having a plurality of scan ICs and generating scan pulse voltage Va to be applied to scan electrode SC1 through scan electrode SCn in the address period
- a pulse generation circuit 50 is provided. Then, each scan electrode SC1 to scan electrode SCn is driven based on the timing signal.
- the scanning ICs are sequentially switched to perform the writing operation so that the writing operation is performed first from the region where the partial lighting rate is high. Thereby, stable address discharge is realized. Details of this will be described later.
- the data electrode drive circuit 42 converts the image data for each subfield into signals corresponding to the data electrodes D1 to Dm, and drives the data electrodes D1 to Dm based on the timing signals.
- the timing generation circuit 45 performs the write operation sequence of the scan IC in the data electrode driving circuit 42.
- the timing signal is generated so that the write pulse voltage Vd is generated. Thereby, the correct writing operation according to the display image can be performed.
- Sustain electrode drive circuit 44 includes a sustain pulse generation circuit and a circuit (not shown) for generating voltage Ve1 and voltage Ve2, and drives sustain electrode SU1 through sustain electrode SUn based on a timing signal.
- FIG. 5 is a circuit diagram showing a configuration of scan electrode driving circuit 43 of plasma display device 1 in accordance with the first exemplary embodiment of the present invention.
- the scan electrode drive circuit 43 includes a scan pulse generation circuit 50, an initialization waveform generation circuit 51, and a sustain pulse generation circuit 52 on the scan electrode 22 side. Each output of the scan pulse generation circuit 50 is scanned by the panel 10.
- the electrodes SC1 to SCn are connected to each.
- the initialization waveform generation circuit 51 raises or lowers the reference potential A of the scan pulse generation circuit 50 in a ramp shape during the initialization period to generate the initialization waveform voltage shown in FIG.
- the sustain pulse generating circuit 52 generates the sustain pulse shown in FIG. 3 by setting the reference potential A of the scan pulse generating circuit 50 to the voltage Vs or the ground potential.
- Scan pulse generation circuit 50 includes a switch 72 for connecting reference potential A to negative voltage Va in a write period, a power supply VC for applying voltage Vc, and n scan electrodes SC1 through SCn.
- Switching elements QH1 to QHn and switching elements QL1 to QLn for applying scan pulse voltage Va are provided.
- Switching elements QH1 to QHn and switching elements QL1 to QLn are integrated into a plurality of ICs for each of a plurality of outputs. This IC is a scanning IC. Then, by turning off the switching element QHi and turning on the switching element QLi, the negative scan pulse voltage Va is applied to the scan electrode SCi via the switching element QLi.
- the operation to turn on the switching element is expressed as “on”
- the operation to turn off the switching element is expressed as “off”
- the signal to turn on the switching element is expressed as “Hi”
- the signal to turn off is expressed as “Lo”.
- the switching elements QL1 to QLn are turned on by turning off the switching elements QH1 to QHn and turning on the switching elements QL1 to QLn.
- Initializing waveform voltage or sustain pulse voltage Vs is applied to each of scan electrode SC1 through scan electrode SCn via switching element QLn.
- switching elements for 90 outputs are integrated as one monolithic IC, and the panel 10 includes 1080 scanning electrodes 22.
- the numerical values given here are merely examples, and the present invention is not limited to these numerical values.
- the SID (1) to SID (12) output from the timing generation circuit 45 are input to the scan IC (1) to the scan IC (12), respectively, in the writing period.
- These SID (1) to SID (12) are operation start signals for causing the scan IC to start an address operation.
- the scan IC (1) to scan IC (12) are SID (1) to SID (12). Based on this, the order of the write operation is switched.
- the write operation is performed on the scan ICs (12) connected to the scan electrodes SC991 to SC1080 and then the scan IC (1) connected to the scan electrodes SC1 to SC90, the following operation is performed. It becomes the operation like this.
- the timing generation circuit 45 changes the SID (12) from Lo (for example, 0 (V)) to Hi (for example, 5 (V)), and instructs the scanning IC (12) to start the writing operation.
- the scan IC (12) detects a change in the voltage of the SID (12), and starts a write operation.
- switching element QH991 is turned off, switching element QL991 is turned on, and scan pulse voltage Va is applied to scan electrode SC991 via switching element QL991.
- switching element QH991 is turned on, switching element QL991 is turned off, switching element QH992 is turned off, switching element QL992 is turned on, and scanning electrode is passed through switching element QL992.
- a scan pulse voltage Va is applied to SC992.
- the series of address operations are sequentially performed, and scan pulse voltage Va is sequentially applied to scan electrode SC991 to scan electrode SC1080, and scan IC (12) ends the address operation.
- the timing generation circuit 45 changes the SID (1) from Lo (for example, 0 (V)) to Hi (for example, 5 (V)), and the scan IC (12). Instruct 1) to start the write operation.
- Scan IC (1) detects the voltage change of SID (1), thereby starting the address operation similar to that described above, and sequentially applies scan pulse voltage Va to scan electrode SC1 through scan electrode SC90.
- the order of the write operation of the scan IC can be controlled using the SID that is the operation start signal.
- the order of the write operation of the scan IC is determined according to the partial lighting rate detected by the partial lighting rate detection circuit 47, and the scanning for driving the region where the partial lighting rate is high is performed.
- the write operation is performed first from the IC. An example of these operations will be described with reference to the drawings.
- FIG. 6 is a schematic diagram showing an example of the connection between the region for detecting the partial lighting rate and the scan IC in the first embodiment of the present invention.
- FIG. 6 simply shows a state of connection between the panel 10 and the scan IC, and each area surrounded by a broken line in the panel 10 represents an area for detecting a partial lighting rate.
- the display electrode pairs 24 are arranged to extend in the left-right direction in the drawing similarly to FIG.
- the partial lighting rate detection circuit 47 detects the partial lighting rate using a region formed by the plurality of scan electrodes 22 connected to one scan IC as one region. For example, if the number of scan electrodes 22 connected to one scan IC is 90 and the scan electrode drive circuit 43 has 12 scan ICs (scan IC (1) to scan IC (12)), As shown in FIG. 6, the partial lighting rate detection circuit 47 uses the 90 scan electrodes 22 connected to each of the scan IC (1) to the scan IC (12) as one area, and displays the display area of the panel 10 as an area. The partial lighting rate of each region is detected by dividing into 12.
- the lighting rate comparison circuit 48 compares the partial lighting rate values detected by the partial lighting rate detection circuit 47 with each other, and ranks the regions in order from the largest value. Then, the timing generation circuit 45 generates a timing signal based on the ranking, and the scan electrode driving circuit 43 performs the write operation first from the scan IC connected to the region where the partial lighting rate is high by the timing signal.
- FIG. 7 is a schematic diagram showing an example of the order of write operations of scan IC (1) to scan IC (12) in the first embodiment of the present invention.
- the area where the partial lighting rate is detected is the same as the area shown in FIG. 6, and the hatched portion represents the distribution of non-lighted cells that do not generate a sustain discharge, The portion represents the distribution of the lighting cells that generate discharge.
- the region with the highest partial lighting rate is the region to which the scan IC (12) is connected (hereinafter referred to as the scan IC (n)).
- the area connected to is referred to as "area (n)"
- the area with the next highest partial lighting rate is the area (10) to which the scan IC (10) is connected, followed by the area with the highest partial lighting rate.
- the writing operation is sequentially switched from the scan IC (1) to the scan IC (2) and the scan IC (3), and the scan IC connected to the region having the highest partial lighting rate.
- the write operation is started.
- the write operation is performed first from the scan IC in the region where the partial lighting rate is high, the write operation is first performed in the scan IC (12) as shown in FIG. 10), the write operation is performed on the scan IC (7).
- the order of the write operation after the scan IC (7) is as follows: scan IC (1), scan IC (2), scan IC (3), scan IC (4), scan IC (5), scan IC (6).
- Scan IC (8), scan IC (9), scan IC (11), and the write operation is region (12), region (10), region (7), region (1), region (2), region (3), region (4), region (5), region (6), region (8), region (9), region (11) are performed in this order.
- the address operation is performed first from the region where the partial lighting rate is high, and stable address discharge is performed. Realized. This is due to the following reason.
- FIG. 8 is a characteristic diagram showing the relationship between the order of address operation of the scan IC and the scan pulse voltage (amplitude) necessary for generating a stable address discharge in the first embodiment of the present invention.
- the vertical axis represents the scan pulse voltage (amplitude) necessary to generate a stable address discharge
- the horizontal axis represents the order of the address operation of the scan IC.
- one screen was divided into 16 regions, and the scan pulse generation circuit 50 was provided with 16 scan ICs to drive the scan electrodes SC1 to SCn. Then, it was measured how the scan pulse voltage (amplitude) required to generate a stable address discharge changes depending on the order of the address operation of the scan IC.
- the scan pulse voltage (amplitude) necessary for generating a stable address discharge also changes in accordance with the order of the address operation of the scan IC. Then, the scan pulse voltage (amplitude) required to generate a stable address discharge increases as the scan IC has a slower address operation order. For example, in the scan IC that performs the address operation first, the scan pulse voltage (amplitude) necessary for generating a stable address discharge is about 80 (V), but the address operation is performed last (here, 16th). In the scan IC, the required scan pulse voltage (amplitude) is about 150 (V), which is about 70 (V).
- the address pulse voltage Vd is applied to each data electrode 32 during the address period (according to the display image), the address pulse voltage Vd is also applied to the discharge cells in which the address operation is not performed. Since the wall charge is reduced by such a voltage change, it is considered that the wall charge is further reduced in the discharge cell in which the address operation is performed at the end of the address period.
- FIG. 9 is a characteristic diagram showing the relationship between the partial lighting rate and the scan pulse voltage (amplitude) necessary for generating a stable address discharge in Embodiment 1 of the present invention.
- the vertical axis represents the scan pulse voltage (amplitude) necessary for generating a stable address discharge
- the horizontal axis represents the partial lighting rate.
- one screen is divided into 16 regions, and in one of the regions, the scan pulse necessary for generating a stable address discharge while changing the ratio of the lighting cells. It was measured how the voltage (amplitude) changes.
- the scan pulse voltage (amplitude) necessary for generating a stable address discharge also changes according to the proportion of the lighted cells. As the lighting rate increases, the scan pulse voltage (amplitude) necessary for generating a stable address discharge increases. For example, when the lighting rate is 10%, the scan pulse voltage (amplitude) necessary to generate a stable address discharge is about 118 (V), but when the lighting rate is 100%, the necessary scan pulse voltage (amplitude) is It becomes about 149 (V), and about 31 (V) becomes large.
- the scan pulse voltage (amplitude) necessary for generating a stable address discharge increases as the order of the address operation of the scan IC becomes slower, that is, as the elapsed time from the initialization operation to the address operation becomes longer. In addition, it increases as the lighting rate increases. Accordingly, when the order of the address operation of the scan IC is slow and the partial lighting rate of the region to which the scan IC is connected is high, the scan pulse voltage (amplitude) necessary for generating a stable address discharge is further increased. growing.
- the partial lighting rate is detected for each region, and the writing operation is performed first from the scan IC connected to the region where the partial lighting rate is high.
- the write operation can be performed first from the region where the partial lighting rate is high, so the write operation in the region where the partial lighting rate is high is performed from the initialization operation to the write operation in the region where the partial lighting rate is low. It is possible to carry out by shortening the elapsed time until. Thereby, it is possible to prevent an increase in the scan pulse voltage (amplitude) necessary for generating a stable address discharge and to generate a stable address discharge.
- the scan pulse voltage (amplitude) necessary for generating a stable address discharge is about 20 (V) depending on the display image by adopting the configuration in the present embodiment. It was confirmed that it can be reduced.
- FIG. 10 is a circuit block diagram showing a configuration example of the scan IC switching circuit 60 according to the first embodiment of the present invention.
- the timing generation circuit 45 includes a scan IC switching circuit 60 that generates SIDs (here, SID (1) to SID (12)). Although not shown here, each scan IC switching circuit 60 is supplied with a clock signal CK that serves as a reference for the operation timing of each circuit.
- the scan IC switching circuit 60 includes the same number (here, 12) of SID generation circuits 61 as the number of SIDs to be generated, and each SID generation circuit 61 includes a lighting rate comparison circuit 48.
- the switching signal SR generated based on the comparison result, the selection signal CH generated during the scanning IC selection period in the writing period, and the start signal ST generated when starting the writing operation of the scanning IC are input.
- Each SID generation circuit 61 outputs an SID based on each input signal. Note that each signal is generated in the timing generation circuit 45, but regarding the selection signal CH, the selection signal CH delayed by a predetermined time in each SID generation circuit 61 is used for the SID generation circuit 61 in the next stage.
- the selection signal CH (1) input to the first SID generation circuit 61 is delayed by a predetermined time in the SID generation circuit 61 to be the selection signal CH (2), and this selection signal CH (2) is generated in the next stage SID generation. Assume that the input is made to the circuit 61. Therefore, in each SID generation circuit 61, the switching signal SR and the start signal ST are input at the same timing, but the selection signals CH are all input at different timings.
- FIG. 11 is a circuit diagram showing a configuration example of the SID generation circuit 61 in Embodiment 1 of the present invention.
- the SID generation circuit 61 includes a flip-flop circuit (hereinafter abbreviated as “FF”) 62, a delay circuit 63, and an AND gate 64.
- FF flip-flop circuit
- the FF 62 has the same configuration and operation as a generally known flip-flop circuit, and has a clock input terminal CKIN, a data input terminal DIN, and a data output terminal DOUT. Then, the state (Lo) of the data input terminal DIN (here, the selection signal CH is inputted) at the time of rising of the signal (here, the switching signal SR) inputted to the clock input terminal CKIN (when changing from Lo to Hi). Or, Hi) is held and the inverted state is output as the gate signal G from the data output terminal DOUT.
- the AND gate 64 inputs the gate signal G output from the FF 62 to one input terminal and inputs the start signal ST to the other input terminal, and outputs the logical product of the two signals. That is, Hi is output only when the gate signal G is Hi and the start signal ST is Hi, and Lo is output otherwise.
- the output of the AND gate 64 becomes the SID.
- the delay circuit 63 has the same configuration and operation as a generally known delay circuit, and has a clock input terminal CKIN, a data input terminal DIN, and a data output terminal DOUT. Then, the signal (here, the selection signal CH) input to the data input terminal DIN is delayed by a predetermined period (here, one period) of the clock signal CK input to the clock input terminal CKIN, and the data Output from the output terminal DOUT. This output becomes the selection signal CH used for the SID generation circuit 61 in the next stage.
- FIG. 12 is a timing chart for explaining the operation of scan IC switching circuit 60 according to the first embodiment of the present invention.
- the operation of the scan IC switching circuit 60 when the write operation is performed on the scan IC (2) after the scan IC (3) will be described as an example.
- Each signal shown here is generated by determining the generation timing in the timing generation circuit 45 based on the comparison result from the lighting rate comparison circuit 48.
- next scan IC to perform the address operation is determined in the scan IC selection period provided in the address period.
- scan IC selection period for determining the scan IC to perform the address operation first is performed immediately before the address period.
- a scan IC selection period for determining the next scan IC to perform the write operation is provided immediately before the write operation of the scan IC during the write operation is completed.
- the selection signal CH (1) is input to the SID generation circuit 61 for generating SID (1).
- the selection signal CH (1) is normally Hi and has a negative pulse waveform that becomes Lo for one cycle of the clock signal CK.
- the selection signal CH (1) is delayed by the period of the clock signal CK1 in the SID generation circuit 61, and is input to the SID generation circuit 61 for generating the SID (2) as the selection signal CH (2).
- the selection signals CH (3) to CH (12) delayed by one cycle of the clock signal CK are input to the SID generation circuits 61, respectively.
- the switching signal SR is normally Lo and has a positive pulse waveform that becomes Hi for one cycle of the clock signal CK. Then, at the timing when the selection signal CH for selecting the scan IC to be written next becomes Lo among the selection signals CH (1) to CH (12) delayed by one cycle of the clock signal CK, A positive pulse is generated. As a result, in the FF 62, a signal obtained by inverting the state of the selection signal CH when the switching signal SR input to the clock input terminal CKIN rises is output as the gate signal G.
- the switching signal SR may be generated such that the state changes in synchronization with the falling edge of the clock signal CK. By doing so, it is possible to provide a time shift corresponding to a half cycle of the clock signal CK with respect to the state change of the selection signal CH, and the operation in the FF 62 can be ensured.
- a positive pulse that becomes Hi for the period of the clock signal CK1 is generated in the start signal ST.
- the start signal ST is input to each SID generation circuit 61 in common, but only the AND gate 64 whose gate signal G is Hi can output a positive pulse.
- the scan IC for the next write operation can be arbitrarily determined.
- the gate signal G (2) is Hi, a positive pulse is generated in the SID (2), and the scanning IC (2) starts the writing operation.
- the SID can be generated by the circuit configuration as described above, the circuit configuration shown here is merely an example, and the present invention is not limited to the circuit configuration shown here. Any circuit configuration may be used as long as it can generate an SID that instructs the scan IC to start the write operation.
- FIG. 13 is a circuit diagram illustrating another configuration example of the scan IC switching circuit according to the first embodiment of the present invention
- FIG. 14 illustrates another example of the scan IC switching operation according to the first embodiment of the present invention. It is a timing chart for doing.
- the start signal ST is delayed in the FF 65 by the period of the clock signal CK1, and the start signal ST and the start signal ST delayed in the FF 65 by the period of the clock signal CK1 are logically processed in the AND gate 66.
- You may comprise so that product operation may be carried out.
- the clock signal CK in which the polarity of the clock signal CK is reversed using the logic inverter INV is input to the clock input terminal CKIN of the FF 65.
- a positive pulse that becomes Hi for the period of the clock signal CK is generated in the start signal ST
- a positive pulse that becomes Hi for the period of the clock signal CK1 is output from the AND gate 66.
- the Lo is output from the AND gate 66.
- the switching signal SR instead of the switching signal SR, if a positive pulse that becomes Hi for the period of the clock signal CK2 is generated in the start signal ST, the positive pulse output from the AND gate 66 is generated. Can be used as a substitute signal for the switching signal SR. That is, in this configuration, since the start signal ST can have the function as the original start signal ST and the function as the switching signal SR, the same operation as described above is performed while reducing the switching signal SR. be able to.
- the display area of panel 10 is divided into a plurality of areas, the partial lighting rate in each area is detected by partial lighting rate detection circuit 47, and the partial lighting rate is high.
- the writing operation is performed first. As a result, it is possible to prevent a scan pulse voltage (amplitude) necessary for generating a stable address discharge from increasing and to generate a stable address discharge.
- each region is set based on the scan electrode 22 connected to one scan IC.
- the present invention is not limited to this configuration, and other classifications are used.
- the configuration may be such that each area is set. For example, if the scanning order of the scanning electrodes 22 can be arbitrarily changed one by one, the partial lighting rate is detected for each scanning electrode 22 with one scanning electrode 22 as one region, and the detection result is Accordingly, the order of the write operation may be changed for each scan electrode 22.
- the present invention is not limited to this configuration. is not.
- the lighting rate in one pair of display electrodes 24 is detected for each display electrode pair 24 as the line lighting rate, and the highest line lighting rate is detected as the peak lighting rate for each region, and the peak lighting rate is high.
- a configuration may be adopted in which the write operation is performed first from the area.
- each signal shown when explaining the operation of the scan IC switching circuit 60 is merely an example, and may be a polarity opposite to the polarity shown in the description.
- the subfield in which the ratio of the luminance weight in one field is a predetermined ratio or more, or the subfield in which the number of sustain pulses generated in the sustain period is a predetermined number or more is described in the first embodiment.
- the scanning ICs are sequentially switched and operated so that the writing operation is performed first from the region where the partial lighting rate is high based on the detection result in the partial lighting rate detection circuit.
- scan electrode SC1 to scan electrode are arranged in a predetermined order.
- a scanning pulse voltage Va is applied to SCn to perform an address operation.
- the scan IC is operated so that the scan pulse voltage Va is sequentially applied from the scan electrode SC1 to the scan electrode SCn.
- the scan pulse voltage Va is sequentially applied from the scan electrode SC1 to the scan electrode SCn.
- scan electrodes SC1 to SC1 are scanned in a predetermined order. The reason why the scan operation is performed by applying the scan pulse voltage Va to the electrode SCn will be described.
- the luminance in each subfield is expressed by the following equation (in order to distinguish between the brightness generated by one discharge and the brightness obtained by repeating the discharge, hereinafter, the former is referred to as “light emission luminance”. The latter is called “luminance”).
- luminance of subfield (Luminance due to sustain discharge generated during sustain period of subfield) + (Luminance due to address discharge generated during address period of subfield)
- high subfield the brightness generated in the sustain period is written. It becomes sufficiently larger than the luminance generated during the period.
- the influence of the luminance generated during the writing period on the luminance of the subfield is substantially negligible. That is, the luminance in the high subfield can be expressed by the following equation.
- (Luminance of subfield) (Luminance due to sustain discharge generated in the sustain period of the subfield)
- the brightness generated in the sustain period is small. Therefore, the luminance generated during the writing period becomes relatively large. Therefore, for example, when the discharge intensity of the address discharge changes and the light emission luminance due to the address discharge changes, the luminance of the subfield may change due to the influence.
- the discharge intensity of the address discharge may change depending on the order of the address operation. This is because the wall charge decreases according to the elapsed time from the initialization operation.
- a discharge cell with a fast address operation has a relatively high discharge intensity and a relatively high light emission luminance due to the address discharge, but a discharge cell with a low address operation has a fast discharge operation. Compared to the above, the discharge intensity of the address discharge is weak, and the light emission luminance due to the address discharge is also low.
- FIG. 15 is a diagram schematically showing a light emission state in a low subfield (for example, the first SF) when a predetermined image is written and displayed in the order corresponding to the partial lighting rate.
- a portion indicated by black (hatched region) represents a non-lighted cell
- a portion indicated by white (region not hatched) represents a lighted cell.
- the region with the highest partial lighting rate is the region (1) (region connected to the scan IC (1)), and the next region with the highest partial lighting rate is the region (3) (scan IC). (Parts connected to (3)), and the partial lighting rates are as follows: region (5), region (7), region (9), region (11), region (2), region (4), region It is assumed that (6), region (8), region (10), and region (12) become smaller in this order.
- region (1), region (3), region (5), region (7), region (9), region (11), region (2) , Region (4), region (6), region (8), region (10), region (12) are written in this order.
- a region in which the order of write operations is late is sandwiched between regions in which the order of write operations is early.
- the region (2) in which the seventh write operation is performed is sandwiched between the region (1) in which the first write operation is performed and the region (3) in which the second write operation is performed.
- the region (4) in which the eighth write operation is performed is sandwiched between the region (3) in which the third write operation is performed and the region (5) in which the third write operation is performed.
- the luminance of each region in the low subfield gradually decreases in accordance with the order of the write operation, but the change in luminance is weak and difficult to perceive.
- FIG. 15 if a region with a slow write operation is sandwiched between regions with a fast write operation, a region where the luminance changes discontinuously occurs. Even if the luminance change is weak, if the change occurs discontinuously, the luminance change is easily perceived, and may be recognized as, for example, a band-like noise.
- the address operation is performed in a predetermined order in a subfield where the luminance generated in the sustain period is small and the change in the light emission luminance due to the address discharge is easily perceived.
- FIG. 16 an image similar to the display image shown in FIG. 15 is sequentially written from the scanning electrode 22 (scanning electrode SC1) at the upper end of the panel 10 toward the scanning electrode 22 (scanning electrode SCn) at the lower end of the panel 10. It is the figure which showed roughly the light emission state in the low subfield (for example, 1st SF) when it displayed.
- the luminance of the lighted cell becomes the panel. 10 gradually decreases from the upper end of panel 10 toward the lower end of panel 10. Therefore, a discontinuous luminance change does not occur on the image display surface of the panel 10, and the luminance change can be smoothed. Since the luminance change based on the address discharge is weak, if the address operation is performed in such an order that the luminance change becomes smooth, the luminance change can be made difficult to be perceived.
- the address operation is performed in a predetermined order in the subfield in which the luminance generated in the sustain period is small and the change in the light emission luminance due to the address discharge is easily perceived.
- the luminance change based on the address discharge on the image display surface of the panel 10 can be smoothed, and the image display quality can be further improved.
- the predetermined ratio described above can be set to 1%, for example.
- one field is composed of eight subfields (first SF, second SF,..., Eighth SF), and the luminance weight of each subfield is set to 1, 2, 4, 8, 16, 32, respectively.
- the writing operation is performed in a predetermined order, and the luminance weight occupying one field is In the third SF to the eighth SF, which are subfields having a ratio of 2% or more, the writing operation is performed first from the region where the partial lighting rate detected by the partial lighting rate detection circuit 47 is high.
- the predetermined number described above can be set to 6, for example.
- one field is composed of eight subfields (first SF, second SF,..., Eighth SF), and the luminance weight of each subfield is set to 1, 2, 4, 8, 16, 32, respectively.
- the luminance weight is set to 64 and 128 and the luminance weight is 4
- the number of sustain pulses generated in the sustain period of each subfield is four times the luminance weight, so the number of sustain pulses generated is less than 6.
- the write operation is performed in a predetermined order
- the second SF to the eighth SF in which the number of sustain pulses generated is 6 or more, the partial lighting rate detection circuit 47 detects the subfield.
- An address operation is performed first from an area where the partial lighting rate is high.
- FIG. 17 is a circuit block diagram of the plasma display device in accordance with the second exemplary embodiment of the present invention.
- the plasma display device 2 includes a panel 10, an image signal processing circuit 41, a data electrode drive circuit 42, a scan electrode drive circuit 43, a sustain electrode drive circuit 44, a timing generation circuit 46, a partial lighting rate detection circuit 47, and a lighting rate comparison circuit 48. And a power supply circuit (not shown) for supplying power necessary for each circuit block.
- a power supply circuit (not shown) for supplying power necessary for each circuit block.
- symbol is attached
- the timing generation circuit 46 generates various timing signals for controlling the operation of each circuit block based on the horizontal synchronization signal H, the vertical synchronization signal V, and the output from the lighting rate comparison circuit 48, and supplies them to the respective circuit blocks.
- the timing generation circuit 46 uses the number of sustain pulses generated in the subfield in which the current subfield has a luminance weight ratio in one field equal to or greater than a predetermined ratio (for example, 1%) or in the sustain period. Is a subfield of a predetermined number (for example, 6) or more.
- each timing signal is generated so that the writing operation is performed first from the region where the partial lighting rate is high.
- scan electrode SC1 to scan electrode are arranged in a predetermined order.
- Each timing signal is generated so that the scan pulse voltage Va is applied to SCn.
- the address operation is performed first from the region where the partial lighting rate is high.
- the subfield in which the luminance generated in the sustain period is small and the change in the light emission luminance due to the address discharge is easily perceived that is, the subfield in which the ratio of the luminance weight in one field is less than a predetermined ratio, or the sustain pulse in the sustain period
- the write operation is performed in a predetermined order.
- scanning electrode 22 at the upper end of panel 10 (scanning electrode SC1) to scanning electrode at the lower end of panel 10 are used.
- scanning electrode SCn the configuration in which the address operation is sequentially performed toward 22
- the present invention is not limited to this configuration.
- the writing operation is sequentially performed from the scanning electrode 22 (scanning electrode SCn) at the lower end of the panel 10 toward the scanning electrode 22 (scanning electrode SC1) at the upper end of the panel 10, or the display area is divided into two.
- a configuration in which an address operation is performed from each scanning electrode 22 (scanning electrode SC1, scanning electrode SCn) at the upper end and the lower end of panel 10 toward scanning electrode 22 (scanning electrode SCn / 2) at the center of panel 10 may be employed.
- the “writing operation performed in a predetermined order” in the present invention is any order of writing operation as long as it can smooth the luminance change based on the address discharge on the image display surface of the panel 10. It doesn't matter.
- a subfield in which the ratio of luminance weight in one field is a predetermined ratio or more, or a subfield in which the number of sustain pulses generated in the sustain period is a predetermined number or more” and “one field
- the configuration in which the writing operation is changed according to the subfield in which the ratio of the luminance weight occupied is less than the predetermined ratio or the subfield in which the number of sustain pulses generated in the sustain period is less than the predetermined number has been described.
- writing is performed with “a subfield in which the ratio of luminance weight in one field is equal to or greater than a predetermined ratio” and “subfield in which the ratio of luminance weight in one field is less than a predetermined ratio”.
- the “subfields where the number of sustain pulses generated during the sustain period is equal to or greater than the predetermined number” and the “subfields where the number of sustain pulses generated during the sustain period are less than the predetermined number” are used.
- the writing operation may be changed.
- it instead of the image display mode, it may be configured to switch between them based on the luminance magnification.
- a plasma display device configured to change the magnitude of the luminance magnification based on the average luminance level of the display image, it is possible to switch these adaptively based on the average luminance level of the display image. Become.
- the operation for determining the order of the write operation in each area based on the detected partial lighting rate is a drive that performs the initialization operation only in the initialization period (hereinafter referred to as “one-phase drive”).
- one-phase drive a drive that performs the initialization operation only in the initialization period
- the wall charge formed in the discharge cell by the initializing discharge during the initializing period gradually decreases with time. For this reason, the discharge cells with a slower order of address operation reduce the wall charge more, and accordingly, the scan pulse voltage (amplitude) necessary for generating a stable address discharge increases.
- the wall charge in the discharge cell in which the address operation is performed toward the end of the address period since the time spent for the address operation becomes longer due to the increase in the number of scan electrodes 22, the wall charge in the discharge cell in which the address operation is performed toward the end of the address period. The decrease in is likely to be greater.
- the second initialization operation in addition to the first initialization operation in the initialization period (hereinafter also referred to as “first initialization operation”), the second initialization operation (hereinafter referred to as “second initialization operation” in the middle of the writing period). And the second initialization operation after the first initialization operation and before the second initialization operation (hereinafter referred to as “first writing period”).
- first writing period By performing the writing operation (hereinafter referred to as “two-phase driving”) in two periods, the subsequent writing period (hereinafter referred to as “second writing period”), the wall charge is higher than that in the one-phase driving. Can be suppressed, and the write operation can be stabilized.
- the initialization operation is performed in the area where the write operation is last performed in the write period, that is, in the area where the write operation is performed latest after the initialization operation. This is because the elapsed time from writing to writing can be reduced to about half compared to the one-phase driving in which the initialization operation is performed only in the initialization period. Note that, in the same way as the one-phase driving, the two-phase driving is one in which an address operation is performed once in one subfield in each discharge cell, and the address operation is not performed twice in one discharge cell. .
- one field is composed of eight subfields (first SF, second SF,..., Eighth SF), and each subfield is 1, 2, 4, 8, 16, 32, Assume that the luminance weights are 64 and 128.
- the all-cell initialization operation is performed in the initialization period of the first SF
- the selective initialization operation is performed in the initialization period of the second SF to the eighth SF.
- the number of subfields and the luminance weight of each subfield are not limited to the above values, and the subfield configuration may be switched based on an image signal or the like.
- FIG. 18 is a drive voltage waveform diagram applied to each electrode of panel 10 according to the third exemplary embodiment of the present invention.
- the first writing period is provided after the first initialization operation in the initialization period, and the second initialization operation is performed after the first writing period is completed.
- a second writing period is provided after the initialization operation is completed.
- the order of performing the write operation in each region is determined so that the region from the initial operation to the write operation becomes shorter as the partial lighting rate is higher. For this reason, in the two-phase driving described in this embodiment, the order of performing the writing operation in each region is different from that in the case of performing the one-phase driving. This is because the second initialization operation is performed during the writing period.
- scan pulse voltage Va is applied sequentially from scan electrode SC1.
- FIG. 18 shows scan electrode SC1 that performs the address operation at the beginning of the first address period, and scan electrode SCn / that performs the address operation at the end of the first address period, that is, immediately before the second initialization operation.
- scan electrode SC540 for example, scan electrode SC540
- SCn / 2 + 1 for example, scan electrode SC541
- scan electrode SCn for example, scan electrode SC1080
- driving voltage waveforms of sustain electrode SU1 to sustain electrode SUn and data electrode D1 to data electrode Dm are shown.
- the first SF which is an all-cell initialization subfield, will be described.
- the operation in the first half of the initialization period of the first SF is the same as the operation in the first half of the initialization period of the first SF of the drive voltage waveform shown in FIG.
- initialization of waveform shapes different from each other in the discharge cell that performs only the first initialization operation and the discharge cell that performs the second initialization operation in addition to the first initialization operation Apply a waveform.
- the down-ramp voltage having the lowest voltage is different between the scan electrode 22 belonging to the discharge cell performing only the first initialization operation and the scan electrode 22 belonging to the discharge cell performing the first and second initialization operations. Is applied to each.
- the scan electrode 22 belonging to the discharge cell that performs only the first initialization operation includes the latter half of the initialization period of the first SF shown in FIG. The same down-ramp voltage L2 is applied. Thereby, initialization is performed between scan electrode SC1 through scan electrode SCn / 2 and sustain electrode SU1 through sustain electrode SUn / 2, and between scan electrode SC1 through scan electrode SCn / 2 and data electrode D1 through data electrode Dm.
- the negative wall voltage above scan electrode SC1 through scan electrode SCn / 2 and the positive wall voltage above sustain electrode SU1 through sustain electrode SUn / 2 are weakened, and the positive voltage above data electrode D1 through data electrode Dm is increased.
- the wall voltage is adjusted to a value suitable for the write operation.
- the scan electrode 22 (scan electrode SCn / 2 + 1 to scan electrode SCn in the example shown in FIG. 18) belonging to the discharge cell that performs the second initialization operation in addition to the first initialization operation is negatively applied from the voltage Vi3.
- a down-ramp voltage L5 that gently falls toward the voltage (Va + Vset5) is applied.
- the voltage Vset5 is set to a voltage (for example, 70 (V)) higher than the voltage Vset2 (for example, 6 (V)).
- the down-ramp voltage L2 drops to the voltage (Va + Vset2) in the scan electrode 22 belonging to the discharge cell that performs only the first initialization operation, whereas the first time.
- the down-ramp voltage L5 is lowered only to a voltage (Va + Vset5) higher than the voltage (Va + Vset2).
- the amount of charge that moves due to the initialization discharge is smaller than that in the discharge cell that generates the initialization discharge by the down-ramp voltage L2. Therefore, more wall charges remain in the discharge cell to which the down-ramp voltage L5 is applied than in the discharge cell to which the down-ramp voltage L2 is applied.
- the writing operation is performed in the first writing period and the second writing period.
- This address operation is sequentially performed on discharge cells that perform only the first initialization operation (in the example shown in FIG. 18, discharge cells having scan electrode SC1 to scan electrode Sn / 2).
- the address operation in the discharge cell that performs only the operation ends.
- the down-ramp voltage which is lower than the down-ramp voltage L5
- the scan electrode 22 belonging to the discharge cell that performs the second initialization operation (scan electrode SCn / 2 + 1 in the example shown in FIG. 18) is applied to the ramp-down voltage L6 that decreases from the voltage Vc toward the negative voltage (Va + Vset3).
- scan electrode SCn To scan electrode SCn).
- the down-ramp voltage L5 decreases only to a negative voltage (Va + Vset5). More wall charges remain in the applied discharge cell than in the discharge cell to which the down-ramp voltage L2 is applied. Therefore, the voltage Vset3 (for example, 8 (V)) is set to a voltage sufficiently lower than the voltage Vset5 (for example, 70 (V)), and the down-ramp voltage L6 is set to a potential sufficiently lower than the down-ramp voltage L5. By lowering, the second initializing discharge can be generated in the discharge cell to which the down-ramp voltage L5 is applied.
- Va + Vset5 a negative voltage
- the wall charge formed by the initialization discharge decreases with time.
- the wall charge can be adjusted in the middle of the address period in the discharge cell that performs the second initialization operation. Therefore, the elapsed time from the initialization operation to the address operation in the discharge cell that is addressed the latest after the initialization operation can be substantially reduced to about half of the one-phase drive. Thereby, it is possible to stably perform the address operation in the discharge cells in which the order of the address operations in the address period is slow.
- the down-ramp voltage L6 is applied to the scan electrode 22 (scan electrode SCn / 2 + 1 to scan electrode SCn in the example shown in FIG. 18) belonging to the discharge cell that performs the second initialization operation.
- scan electrodes 22 in the example shown in FIG. 18, scan electrodes SC1 to SCn / 2 belonging to the discharge cells that perform only the first initialization operation. It is described. Since the discharge cell that performs only the first initialization operation has already completed the address operation, it is not necessary to apply the down-ramp voltage L6.
- the scan electrode driving circuit when it is difficult to configure the scan electrode driving circuit so that the down-ramp voltage L6 can be selectively applied, only the first initialization operation is performed on the down-ramp voltage L6 as shown in FIG. It may be applied to the discharge cell. This is because a down-ramp voltage L6 that falls only to a voltage (Va + Vset3) higher than the lowest voltage (Va + Vset2) of the down-ramp voltage L2 is applied to the discharge cell that has generated the initializing discharge by applying the down-ramp voltage L2. This is because the initialization discharge does not occur again.
- the scan electrode 22 that has not been subjected to the address operation (scan electrode SCn / 2 + 1 to scan electrode SCn in the example shown in FIG. 18) is described above.
- the write operation is performed in the same procedure. All the above write operations are completed, and the write period in the first SF is completed.
- the operation in the subsequent sustain period is the same as the operation in the sustain period of the drive voltage waveform shown in FIG.
- the scan electrode 22 (scan electrode SC1 to scan electrode SCn / 2 in the example shown in FIG. 18) belonging to the discharge cell that performs only the first initialization operation includes the second SF of FIG.
- a down-ramp voltage L4 that decreases from a voltage (for example, 0 (V)) that is equal to or lower than the discharge start voltage to a negative voltage (Va + Vset4) is applied.
- the discharge cells in which no sustain discharge has occurred in the previous subfield are not discharged, and the wall charge state at the end of the initialization period of the previous subfield is maintained as it is.
- scan electrode 22 (scan electrode SCn / 2 + 1 to scan electrode SCn in the example shown in FIG. 18) belonging to the discharge cell that performs the second initialization operation in addition to the first initialization operation has a discharge start voltage or less.
- a down-ramp voltage L7 that falls from a voltage (for example, 0 (V)) to a negative voltage (Va + Vset5) is applied.
- the discharge that caused the sustain discharge in the sustain period of the previous subfield is performed as described above.
- a weak initializing discharge is generated only in the cell.
- the down-ramp voltage L7 falls only to a voltage (Va + Vset5) higher than the voltage (Va + Vset2), in the discharge cell to which the down-ramp voltage L7 is applied, the amount of charge that moves due to the initialization discharge is reduced.
- produces initialization discharge by L4. Therefore, more wall charges remain in the discharge cell to which the down-ramp voltage L7 is applied than in the discharge cell to which the down-ramp voltage L4 is applied.
- the same drive waveform as that in the first SF address period is applied to each electrode. That is, an address operation is performed on the discharge cell to which the down-ramp voltage L4 is applied, and then a second initialization operation is performed on the discharge cell to which the down-ramp voltage L7 is applied, using the down-ramp voltage L6. Subsequently, an address operation is performed on the discharge cells that have undergone the second initialization operation.
- the operation during the sustaining period of the second SF is the same as that during the sustaining period of the first SF, and the description thereof will be omitted.
- the second SF is different from the scan electrode SC1 through the scan electrode SCn, the sustain electrode SU1 through the sustain electrode SUn, and the data electrode D1 through the data electrode Dm except that the number of sustain pulses in the sustain period is different.
- a similar drive voltage waveform is applied.
- Vset2 at the down-ramp voltage L2 it is desirable to set the voltage Vset2 at the down-ramp voltage L2 to a voltage smaller than the voltage Vset4 (for example, 10 (V)) at the down-ramp voltage L4.
- Vset4 for example, 10 (V)
- the initializing discharge in the first SF that is, the first initializing discharge in one field period is surely generated by setting the voltage (Va + Vset2) to a voltage smaller than the voltage (Va + Vset4).
- FIG. 19 shows the relationship between the scan pulse voltage (amplitude) necessary for generating a stable address discharge and the order of address operations when performing two-phase driving in the third embodiment of the present invention, and scan electrodes SC1 to SC. It is a figure which shows schematically the drive voltage waveform applied to the electrode SCn.
- FIG. 19 is a characteristic diagram (shown on the upper side of FIG. 19) schematically showing the relationship between the scan pulse voltage (amplitude) necessary for generating a stable address discharge and the order of the address operation.
- a waveform diagram showing driving voltage waveforms applied to scan electrode SC1 through scan electrode SCn (shown on the lower side of FIG. 19) is shown in one drawing. This is for easy understanding of the timing relationship between the change in the drive voltage waveform and the scan pulse voltage (amplitude) necessary for generating a stable address discharge.
- the horizontal axis represents the scan electrodes SC1 to SC.
- the order of the address operation of the electrode SCn is represented, and the vertical axis represents the scan pulse voltage (amplitude) necessary for generating a stable address discharge in each discharge cell.
- scan electrode 22 (in the example shown in FIG. 19) performing the address operation at the beginning of the first address period.
- Scan electrode SC1 Scan electrode SC1
- scan electrode 22 performing the address operation at the beginning of the second address period (scan electrode SCn / 2 + 1 in the example shown in FIG. 19), and address operation at the end of the second address period.
- a drive voltage waveform applied to scan electrode 22 (scan electrode SCn in the example shown in FIG. 19) is shown.
- the address operation is sequentially performed from scan electrode SC1 to scan electrode SCn, and the second initialization operation is performed between the address operation of scan electrode SCn / 2 and the address operation of scan electrode SCn / 2 + 1.
- the experiment was conducted under the conditions, and the detection result was shown in a graph.
- the characteristic diagram of FIG. 19 is a graph showing the relationship between the scan pulse voltage (amplitude) necessary for generating a stable address discharge and the passage of time after the initialization operation.
- the scan pulse voltage Va is not changed for each scan electrode.
- the scanning pulse voltage (amplitude) necessary for generating a stable address discharge during the one-phase driving is indicated by a broken line.
- the down-ramp voltage L6 is applied to the discharge cell that has not yet been subjected to the address operation during the address period (in the waveform diagram of FIG. 19, just before the address operation of scan electrode SCn / 2 + 1 is performed).
- the scan pulse voltage (amplitude) required to generate a stable address discharge can be reduced in the discharge cell that performs the second initialization operation. It becomes.
- the scanning pulse voltage (amplitude) necessary for generating a stable address discharge in the discharge cell performing the address operation at the end of the address period was driven by one phase. It was confirmed that about 20 (V) can be reduced compared to the case.
- the order of performing the write operation in each region is determined so that the region from the initialization operation to the write operation becomes shorter as the partial lighting rate is higher. For this reason, the order in which the writing operation is performed in each region differs between when performing two-phase driving and when performing one-phase driving.
- FIG. 20 is a schematic diagram showing an example of the scanning order (an example of the order of the writing operation of the scanning IC) according to the partial lighting rate when displaying a predetermined image in the third embodiment of the present invention by two-phase driving. is there.
- a hatched area represents a region where non-lighted cells are distributed
- a white area without a hatched line represents a region where lighted cells are distributed.
- the boundaries between the regions are indicated by broken lines in order to show each region in an easy-to-understand manner.
- the region with the highest partial lighting rate is the region (1) connected to the scan IC (1).
- the partial lighting rates are the region (2), the region (3), and the region ( 4), region (5), region (6), region (7), region (8), region (9), region (10), region (11), and region (12) become smaller in this order.
- the writing operation is performed in the region (1) having the highest partial lighting rate, and then the partial lighting is performed. Every other region from the highest rate, that is, the third highest partial lighting rate region (3), the fifth highest partial lighting rate region (5), and the seventh highest partial lighting rate region (7).
- the address operation is performed in the order of the ninth region (9) having the highest partial lighting rate and the eleventh region (11) having the highest partial lighting rate.
- the remaining areas are sequentially ordered from the area with the highest partial lighting rate, that is, the area with the second highest partial lighting rate (2) and the area with the fourth highest partial lighting rate (4 ),
- the sixth region with the highest partial lighting rate (6), the eighth region with the highest partial lighting rate (8), the tenth region with the highest partial lighting rate (10), and the lowest partial lighting rate region (12). ) Write in order.
- the region (2) with the second highest partial lighting rate can also perform the write operation immediately after the initialization operation.
- the elapsed time from the initialization operation to the write operation in the region (12) with the lowest partial lighting rate and the region (11) with the second lowest partial lighting rate is substantially compared with that when performing one-phase driving. Can be halved.
- the second initialization operation is performed during the writing period. Therefore, for example, as shown in FIG. 20, after the first initialization operation, the write operation is performed in each region in the order of every other region from the region having the highest partial lighting rate, and after the second initialization operation, The remaining areas can be written in order from the area with the highest partial lighting rate.
- the order of the write operation in each area when performing the two-phase drive is not limited to the order shown in FIG.
- the address operation in the region with the largest partial lighting rate is performed immediately after the first initialization operation
- the address operation in the region with the second largest partial lighting rate is performed immediately after the second initialization operation.
- the configuration to be performed has been described.
- the writing operation of each region may be performed in such an order that the elapsed time from the initialization operation to the writing operation becomes shorter as the partial lighting rate is higher.
- the configuration may be such that the write operation is performed in the order of the region (5), the region (7), the region (9), and the region (11).
- the write operation is performed in the order of the region (1), the region (4), the region (5), the region (8), the region (9), and the region (12).
- the writing operation may be performed in the order of region (2), region (3), region (6), region (7), region (10), and region (11).
- the write operation is performed in the order of the region (2), the region (3), the region (6), the region (7), the region (10), and the region (11).
- the writing operation may be performed in the order of region (1), region (4), region (5), region (8), region (9), and region (12).
- the configuration in the present invention that is, the order of performing the write operation in each region is determined so that the region from which the partial lighting rate is higher has a shorter time from the initialization operation to the write operation.
- a configuration can be realized.
- the configuration may be such that all the subfields are driven in two phases, but in the two-phase driving, the driving time increases as the number of initialization operations increases compared to the one-phase driving. Therefore, when there is no allowance for driving time, for example, two-phase driving is performed only in a subfield having a large luminance weight, and one-phase driving is performed in a subfield having a small luminance weight. You may restrict. In that case, the order of the write operation may be determined optimally depending on whether it is one-phase driving or two-phase driving.
- the description has been given by taking as an example the two-phase driving in which the second initialization operation is performed in the writing period.
- the second and third initialization operations are performed in the writing period. It may be configured to perform phase driving or multiphase driving that performs initialization operation higher than that.
- the address operation in the region with the largest partial lighting rate is performed immediately after one initialization operation, and the address operation in the region with the second largest partial lighting rate is performed immediately after the other one initialization operation. It is assumed that the order of the address operation is set based on the same concept as described above, such that the address operation in the region where the partial lighting rate is the second largest is performed immediately after another initialization operation.
- FIG. 21 is a circuit diagram of scan electrode drive circuit 49 according to Embodiment 3 of the present invention.
- Scan electrode driving circuit 49 includes sustain pulse generating circuit 52 that generates a sustain pulse, initialization waveform generating circuit 51 that generates an initialization waveform, and scan pulse generating circuit 56 that generates a scan pulse. Each output is connected to each of scan electrode SC1 to scan electrode SCn of panel 10.
- FIG. 21 shows a circuit using sustain pulse generating circuit 52 and voltage Vr (for example, Miller integration circuit 53) when a circuit (for example, Miller integration circuit 54) using negative voltage Va is operated. ) Is a separation circuit using a switching element Q4 provided for electrical separation.
- Vr for example, Miller integration circuit 53
- Sustain pulse generation circuit 52 has the same configuration and operation as sustain pulse generation circuit 52 shown in the first embodiment, and includes a generally used power recovery circuit and clamp circuit (not shown), and generates timing. Based on the control signal output from the circuit 45, each switching element provided therein is switched to generate a sustain pulse. In addition, a Miller integration circuit (not shown) for generating a rising ramp voltage is provided, and an erase ramp voltage L3 is generated at the end of the sustain period.
- the initialization waveform generation circuit 51 has the same configuration and operation as the initialization waveform generation circuit 51 shown in the first embodiment, and includes a switching element Q1, a capacitor C1, and a resistor R1, and a reference for the scan pulse generation circuit 56.
- a Miller integrating circuit 53 that raises the potential A in a ramp shape
- a Miller integrating circuit 54 that has a switching element Q2, a capacitor C2, and a resistor R2 and lowers the reference potential A of the scanning pulse generating circuit 56 in a ramp shape.
- Miller integration circuit 53 generates a ramp voltage that increases during initialization operation
- Miller integration circuit 54 generates a ramp voltage that decreases during initialization operation.
- the input terminal of Miller integrating circuit 53 is shown as input terminal IN1
- the input terminal of Miller integrating circuit 54 is shown as input terminal IN2.
- the reference potential A is a potential in a path connected to the input terminal INa on the low voltage side of the scan IC 55 described later.
- the initialization waveform generating circuit 51 employs a Miller integrating circuit using a practical and relatively simple FET, but the present embodiment is not limited to this configuration. Any circuit that can raise or lower the reference potential A in a ramp shape may be used.
- Scan pulse generation circuit 56 includes a plurality of scan ICs 55 (in this embodiment, scan IC (1) to scan IC (12)) that output a scan pulse to each of scan electrode SC1 to scan electrode SCn, and an address period.
- a switching element Q5 for connecting the reference potential A to the negative voltage Va, a diode D31 and a capacitor for applying a voltage Vc in which the voltage Vscn is superimposed on the reference potential A to the high voltage side (input terminal INb) of the scan IC 55 C31, comparators CP1 and CP2 for comparing the magnitudes of the input signals input to the two input terminals, a switching element SW1 for applying a voltage (Va + Vset2) to one input terminal of the comparator CP1, A switching element SW2 for applying a voltage (Va + Vset3) to one input terminal of the comparator CP1, Switching element SW3 for applying voltage (Va + Vset4) to one input terminal of comparator CP1, and control for controlling scan IC 55 (in this embodiment, scan
- the other input terminal of the comparator CP1 is connected to the reference potential A.
- One input terminal of the comparator CP2 is connected to the voltage (Va + Vset5), and the other input terminal of the comparator CP2 is connected to the reference potential A.
- the same number of OR gates OR and AND gates AG as the scan ICs 55 (12 in the present embodiment) are provided.
- the scan IC 55 includes two input terminals, an input terminal INa that is an input terminal on the low voltage side and an input terminal INb that is an input terminal on the high voltage side, and a plurality of output terminals connected to each of the scan electrodes 22. One of the voltages input to the two input terminals is output from each output terminal based on the control signal.
- Each scan IC 55 (in this embodiment, scan IC (1) to scan IC (12)) has an AND gate AG (in this embodiment, AND gate AG (1) to Control signal OC1 ′ (in this embodiment, control signal OC1 ′ (1) to control signal OC1 ′ (12)) output from the AND gate AG (12)), control signal OC2 output from the comparator CP1, Scan start signal SID (in this embodiment, scan start signal SID (1) to scan start signal SID (12)) output from timing generation circuit 45 during the writing period is input.
- the control signal OC2 is a control signal that is commonly input to all the scan ICs 55.
- a clock signal CLK that is a synchronization signal for synchronizing the signal processing operation is input to all the scan ICs 55.
- the configuration of the scan pulse generation circuit 56 as shown in FIG. 21 can arbitrarily set the waveform shape of the initialization waveform applied to the scan IC 55. Next, the operation of the scan pulse generation circuit 56 will be described.
- Scan pulse generation circuit 56 is controlled by timing generation circuit 45 to output the voltage waveform of initialization waveform generation circuit 51 in the initialization period and to output the voltage waveform of sustain pulse generation circuit 52 in the sustain period. Shall be.
- FIG. 22 is a diagram for explaining a correspondence relationship between the control signals OC1 'and OC2 and the operation state of the scan IC 55 in the third embodiment of the present invention.
- the scan IC 55 is in the “All-Hi” state, that is, the output terminal of the scan IC 55. All are electrically connected to the input terminal INb on the high voltage side.
- the scan IC 55 When the control signal OC1 ′ is “Hi” and the control signal OC2 is at a low level (hereinafter referred to as “Lo”), the scan IC 55 is in the “All-Lo” state, that is, all the output terminals of the scan IC 55 are at a low voltage. It will be in the state electrically connected with the side input terminal INa.
- sustain pulse generating circuit 52 when sustain pulse generating circuit 52 is operated, switching element QH1 to switching element QHn are turned off and switching element QL1 to switching are performed by setting control signal OC1 ′ to “Hi” and control signal OC2 to “Lo”.
- Element QLn is turned on, and the sustain pulse output from sustain pulse generating circuit 52 can be applied to each of scan electrode SC1 through scan electrode SCn via switching element QL1 through switching element QLn.
- the scan IC 55 When the control signal OC1 ′ is “Lo” and the control signal OC2 is “Hi”, the scan IC 55 performs a series of operations determined in advance based on the “DATA” state, that is, the scan start signal SID input to the scan IC 55. It becomes a state.
- the scan start signal SID is input to the scan IC 55 (in this embodiment, when the scan start signal SID is set to “Lo” for a predetermined period), first, the first output terminal of the scan IC 55 Only the low voltage side input terminal INa is electrically connected, and all the remaining output terminals are electrically connected to the high voltage side input terminal INb. After the state continues for a predetermined time (for example, 1 ⁇ sec), only the second output terminal of the scan IC 55 is then electrically connected to the low voltage side input terminal INa, and all the remaining output terminals are high. It is electrically connected to the voltage side input terminal INb.
- a predetermined time for example, 1 ⁇ sec
- each output terminal of the scan IC 55 is electrically connected to the low voltage side input terminal INa in order for a predetermined time.
- the scan IC 55 is set in this operation state in the address period to sequentially generate the scan pulse voltage Va, and the address operation of the scan electrodes SC1 to SCn is performed.
- FIG. 23 is a timing chart for explaining an example of the operation of scan electrode driving circuit 49 in the third embodiment of the present invention.
- the voltage Vi1 and the voltage Vi3 are equal to the voltage Vs, and the voltage Vi2 is equal to the voltage Vr.
- the write operation is performed to the scan IC (1) immediately after the first initialization operation, that is, at the beginning of the write period.
- FIG. 23 shows the drive voltage waveform applied to the scan electrode SC1 that performs the address operation at the beginning of the first address period, and the address immediately after the second initialization operation, that is, at the beginning of the second address period.
- the drive voltage waveform applied to scan electrode SCn / 2 + 1 (for example, scan electrode SC541) that performs the operation, and signals necessary for control of scan IC (1) and scan IC (7), that is, control signal OC1, control Control signal of signal OC2, control signal OC1 ′ (1), control signal OC1 ′ (7), output signal CPO of comparator CP2, scanning start signal SID (1), scanning start signal SID (7), and input terminal
- the constant current supply state to IN1 and input terminal IN2 is shown.
- the scan IC 55 starts the write operation by setting the scan start signal to “Lo” for a predetermined period (for example, one cycle of the clock signal CLK) in the “DATA” state. Shall. In the first half of the initialization period (period in which the up-ramp voltage L1 is generated) and the sustain period, the switching element Q4 is turned on, and the second half of the initialization period (period in which the down-ramp voltage L2 is generated) and the address period Assume that the switching element Q4 is turned off.
- a predetermined period for example, one cycle of the clock signal CLK
- the control signal OC1 and the control signals SID (1) to SID (12) are set to “Hi”.
- the clamp circuit of the sustain pulse generating circuit 52 is operated to set the reference potential A to 0 (V). Since 0 (V) of the reference potential A is higher than any of the voltage (Va + Vset2), the voltage (Va + Vset3), and the voltage (Va + Vset4), the control signal OC2 output from the comparator CP1 becomes “Lo”. Since the control signal OC1 and the control signals SID (1) to SID (12) are all “Hi”, the control signal OC1 ′ (1) output from the AND gate AG (1) to the AND gate AG (12). ) To control signal OC1 ′ (12) also becomes “Hi”. As a result, all the scan ICs 55 are in the “All-Lo” state, and 0 (V) of the reference potential A becomes the output voltage of the scan IC 55.
- the power recovery circuit of sustain pulse generation circuit 52 is operated to raise the potential of reference potential A.
- the clamp circuit of sustain pulse generating circuit 52 is operated to set reference potential A to the voltage Vs (equal to voltage Vi1 in this embodiment).
- the input terminal IN1 of Miller integrating circuit 53 that generates upramp voltage L1 is set to “Hi”. Specifically, a predetermined constant current is input to the input terminal IN1. Then, a constant current flows from the resistor R1 toward the capacitor C1, the source voltage of the switching element Q1 rises in a ramp shape, and the output voltage of the initialization waveform generation circuit 51 also starts to rise in a ramp shape. This voltage increase continues while the input terminal IN1 is “Hi”.
- the input terminal IN1 When the output voltage rises to the voltage Vr (equal to the voltage Vi2 in this embodiment), the input terminal IN1 is set to “Lo” at the subsequent time t2. Specifically, for example, 0 (V) is applied to the input terminal IN1. When the input terminal IN1 is set to “Lo”, the potential of the reference potential A is decreased to the voltage Vs (equal to the voltage Vi3 in this embodiment).
- control signal OC1 and the control signals SID (1) to SID (12) are kept at “Hi”. Therefore, the control signals OC1 ′ (1) to OC1 ′ (12) output from the AND gate AG are also “Hi”.
- switching element SW2 and switching element SW3 are turned off and switching element SW1 is turned on to generate voltage (Va + Vset2).
- reference potential A that is, an initialization waveform generation circuit is generated. The drive voltage output from 51 and the voltage (Va + Vset2) are compared. Accordingly, during this period, the reference potential A is higher in potential than the voltage (Va + Vset2), so that the control signal OC2 output from the comparator CP1 is “Lo”.
- the control signal OC1 ′ (1) to the control signal OC1 ′ (12) are “Hi” and the control signal OC2 is “Lo”, all the scan ICs 55 are in the “All-Lo” state.
- the reference potential A that is, the drive voltage output from the initialization waveform generating circuit 51 is output as it is.
- the voltage Vs (equal to the voltage Vi1 in the present embodiment) that is equal to or lower than the discharge start voltage gradually decreases toward the voltage Vr (equal to the voltage Vi2 in the present embodiment) that exceeds the discharge start voltage. Is applied to scan electrode SC1 through scan electrode SCn.
- a predetermined constant current is input to the input terminal IN2 of the Miller integrating circuit 54 that generates the down-ramp voltage, and the input terminal IN2 is set to “Hi”. Then, a constant current flows from the resistor R2 toward the capacitor C2, the drain voltage of the switching element Q2 decreases in a ramp shape, the potential of the reference potential A decreases in a ramp shape, and the output voltage of the scan IC 55 also increases in a ramp shape. Start to descend.
- control signal SID for controlling the scan IC 55 for outputting the down-ramp voltage L2 is kept at “Hi”.
- the control signals SID (1) to SID (6) are kept at “Hi”.
- the control signals OC1 '(1) to OC1' (6) are kept in the "Hi" state.
- the voltage of the reference potential A that is, the down-ramp voltage is compared with the voltage (Va + Vset2), and the output signal from the comparator CP1, that is, the control signal OC2, has the down-ramp voltage at the reference potential A. From “Lo” to “Hi” at time t5 when the voltage is equal to or lower than the voltage (Va + Vset2).
- control signal OC1 ′ for example, the control signal OC1 ′ (1) to the control signal OC1 ′
- the scan IC 55 for example, the scan IC (1) to the scan IC (6)
- the control signal OC2 are both “Hi” at time t5
- the scan IC 55 to which the down-ramp voltage L2 is to be output can be set to the “All-Hi” state.
- the voltage output from the scan IC 55 for outputting the down-ramp voltage L2 is the voltage input to the input terminal INb at time t5, that is, the voltage Vc obtained by superimposing the voltage Vscn on the reference potential A.
- the voltage drop is switched to voltage rise at time t5.
- the down-ramp voltage L2 is output from the scan IC 55 for which the down-ramp voltage L2 is to be output, and, for example, the down-ramp voltage L2 having the lowest voltage (Va + Vset2) is applied to the scan electrodes SC1 to SCn / 2. be able to.
- the control signal SID for controlling the scanning IC 55 for outputting the down-ramp voltage L5 is changed from “Hi” to “Lo” before the time t3.
- the control signal SID (7) to the control signal SID (12) are changed from “Hi” to “Lo” before the time t3.
- the signal CPO output from the comparator CP2 is output from the OR gate OR (7) to OR gate OR (12), and from the AND gate AG (7) to AND gate AG (12).
- the signal CPO is output as the control signal OC1 ′ (7) to the control signal OC1 ′ (12).
- the comparator CP2 compares the reference potential A with the voltage (Va + Vset5), the signal CPO output from the comparator CP2 starts from “Hi” at time t4 when the reference potential A becomes equal to or lower than the voltage (Va + Vset5). Becomes “Lo”.
- control signal OC1 ′ (for example, the control signal OC1 ′ (7) to the control signal OC1 ′) for controlling the scan IC 55 (for example, the scan IC (7) to the scan IC (12)) to which the down-ramp voltage L5 is to be output. (12)) can be changed from “Hi” to “Lo” at time t4.
- the control signal OC1 ′ and the control signal OC2 for controlling the scan IC 55 for which the down-ramp voltage L5 is to be output are both “Lo” at time t4, and the scan IC 55 for which the down-ramp voltage L5 is to be output is set to the “HiZ” state. can do. Therefore, the output voltage of the scan IC 55 for outputting the down-ramp voltage L5 is a voltage in which the output voltage at the time t4 is held as it is. For example, the lowest voltage is applied to the scan electrode SCn / 2 + 1 to the scan electrode SCn (Va + Vset5). ) Down-ramp voltage L5 can be applied.
- time t6 when the initialization period ends for example, 0 (V) is applied to the input terminal IN2, and the input terminal IN2 is set to “Lo”.
- the scan electrode drive circuit 43 decreases from the voltage Vi3 to the voltage (Va + Vset2) from the scan IC 55 (for example, the scan IC (1) to the scan IC (6)) that is desired to output the down-ramp voltage L2.
- the down-ramp voltage L2 is output, and the down-ramp voltage is applied to the scan electrode 22 (for example, the scan electrode SC1 to the scan electrode SCn / 2) to be addressed between the first initialization operation and the second initialization operation. L2 is applied.
- the scan IC 55 (for example, the scan IC (7) to the scan IC (12)) to which the down ramp voltage L5 is to be output outputs the down ramp voltage L5 that decreases from the voltage Vi3 toward the voltage (Va + Vset5).
- Down-ramp voltage L5 is applied to scan electrode 22 (for example, scan electrode SCn / 2 + 1 to scan electrode SCn) to be subjected to an address operation after the initial initialization operation.
- the initialization period ends.
- control signal OC1 is set to “Lo” at time t6. Therefore, the control signal OC1 ′ (for example, the control signal OC1 ′ (1) to the control signal OC1 ′ (12)) output from the AND gate AG (for example, the AND gate AG (1) to the AND gate AG (12)) is also used. “Lo”. As a result, all the scan ICs 55 are in the “DATA” state, and the write operation is started by the scan start signal.
- first, scan electrodes 22 (for example, scan electrode SC1 to scan electrode SCn / 2) that perform an address operation from the first initialization operation to the second initialization operation are sequentially scanned. Apply a pulse.
- the scan IC (1), the scan IC (2), the scan IC (3), the scan IC (4), the scan IC (5), and the scan IC (6) are written in this order.
- the scanning start signal SID (1) is set to “Lo” for a predetermined period (for example, one cycle of the clock signal CLK) at time t7 immediately after the start of the first writing period.
- the scan IC (1) starts an address operation, and a scan pulse is sequentially applied to the scan electrodes 22 connected to the scan IC (1) (in this case, from the scan electrode SC1).
- the scanning start signal SID (2) is set to “Lo” for a predetermined period (for example, one cycle of the clock signal CLK) at the timing when the writing operation of all the scanning electrodes 22 connected to the scanning IC (1) is completed.
- the scan IC (2) starts the write operation.
- the scanning start signal SID (3) to the scanning start signal SID (6) are set to “Lo” for a predetermined period.
- the write operation is sequentially performed on scan IC (1) to scan IC (6), and the scan pulse is applied to scan electrode SC1 to scan electrode SCn / 2.
- the control signal OC1 is set to “Hi”. Since the scan start signal SID (for example, the scan start signal SID (1) to the scan start signal SID (12)) is maintained at “Hi”, the control signal OC1 ′ (for example, the control signal) output from the AND gate AG is maintained. OC1 ′ (1) to control signal OC1 ′ (12)) also become “Hi”. Although not shown, the switching element Q5 is turned off at time t8, and the clamp circuit of the sustain pulse generation circuit 52 is operated to set the reference potential A to 0 (V).
- the control signal OC2 output from the comparator CP1 becomes “Lo”. That is, the control signal OC1 ′ (for example, the control signal OC1 ′ (1) to the control signal OC1 ′ (12)) is “Hi”, the control signal OC2 is “Lo”, and all the scan ICs 55 are “All-Lo”.
- the reference potential A (0 (V) in this embodiment) is output from the output terminals of all the scan ICs 55.
- a predetermined constant current is input to the input terminal IN2 of the Miller integrating circuit 54 that generates the down-ramp voltage, and the input terminal IN2 is set to “Hi”.
- the drain voltage of the switching element Q2 decreases in a ramp shape
- the potential of the reference potential A decreases in a ramp shape
- the output voltage of the scan IC 55 also starts to decrease in a ramp shape.
- the comparator CP1 compares the down-ramp voltage at the reference potential A with the voltage (Va + Vset3), and the control signal OC2 output from the comparator CP1 has a down-ramp voltage at the reference potential A equal to or lower than the voltage (Va + Vset3).
- “Lo” is changed to “Hi”.
- the control signal OC1 ′ for example, the control signal OC1 ′ (1) to the control signal OC1 ′ (12)
- the control signal OC2 are both “Hi”, and all the scan ICs 55 are in the “All-Hi” state.
- the voltage input to the input terminal INb of the scan IC 55 that is, the voltage Vc obtained by superimposing the voltage Vscn on the reference potential A becomes the output voltage of the scan IC 55.
- the lowest ramp voltage applied to scan electrode SC1 through scan electrode SCn is the lower ramp voltage L6 having the voltage (Va + Vset3).
- the input terminal IN2 is set to “Lo”.
- scan electrode drive circuit 43 generates down-ramp voltage L6 and starts an address operation to scan electrode 22 (for example, scan electrode SCn / 2 + 1 to scan electrode SCn) that has not yet been addressed.
- a second initializing discharge is generated in the discharge cell to which the down-ramp voltage L5 is applied.
- the switching element Q5 is turned on to maintain the reference potential A at the negative voltage Va.
- switching element SW1 and switching element SW2 are turned off and switching element SW3 is turned on to generate voltage (Va + Vset4).
- comparator CP1 reference potential A, that is, negative voltage Va is compared with voltage (Va + Vset4). To be done. Accordingly, during this period, the reference potential A is lower in potential than the voltage (Va + Vset4), so that the control signal OC2 output from the comparator CP1 is “Hi”.
- the control signal OC1 is changed from “Hi” to “Lo”. Therefore, the control signal OC1 ′ (for example, the control signal OC1 ′ (1) to the control signal OC1 ′ (12)) output from the AND gate AG (for example, the AND gate AG (1) to the AND gate AG (12)) is also used. “Lo”. As a result, all the scan ICs 55 are in the “DATA” state, and the write operation is started by the scan start signal SID.
- scan pulses are sequentially applied to scan electrodes 22 (for example, scan electrode SCn / 2 + 1 to scan electrode SCn) that have not yet been addressed.
- scan electrodes 22 for example, scan electrode SCn / 2 + 1 to scan electrode SCn
- the scanning start signal SID (7) is set to “Lo” for a predetermined period (for example, one cycle of the clock signal CLK) at time t12 immediately after the start of the second writing period.
- the scan IC (7) starts an address operation, and scan pulses are sequentially applied to the scan electrodes 22 connected to the scan IC (7) (in this case, from the scan electrode SCn / 2 + 1).
- the scanning start signal SID (8) is set to “Lo” for a predetermined period (for example, one cycle of the clock signal CLK) at the timing when the writing operation of all the scanning electrodes 22 connected to the scanning IC (7) is completed.
- the scan IC (8) starts an address operation.
- the scanning start signal SID (9) to the scanning start signal SID (12) are set to “Lo” for a predetermined period. In this way, the write operation is sequentially performed on the scan IC (7) to the scan IC (12), and the scan pulse is applied to the scan electrode SCn / 2 + 1 to the scan electrode SCn.
- the control signal OC1 is set to “Hi” at time t13 after the write operation to all the scan electrodes 22 is finished and the write period is finished. Since the scan start signal SID (for example, the scan start signal SID (1) to the scan start signal SID (12)) is maintained at “Hi”, the control signal OC1 ′ (for example, the control signal) output from the AND gate AG is maintained. OC1 ′ (1) to control signal OC1 ′ (12)) also become “Hi”.
- the switching element Q5 is turned off at time t13, and the clamp circuit of the sustain pulse generating circuit 52 is operated to set the reference potential A to 0 (V).
- the control signal OC2 output from the comparator CP1 changes from “Hi” to “Lo” at time t13. That is, since the control signal OC1 ′ (for example, the control signal OC1 ′ (1) to the control signal OC1 ′ (12)) is “Hi” and the control signal OC2 is “Lo”, all the scan ICs 55 are in the “All-Lo” state. Thus, the reference potential A (0 (V) in this embodiment) is output from the output terminal of the scan IC 55.
- the power recovery circuit and the clamp circuit of the sustain pulse generating circuit 52 are alternately operated to generate a predetermined number of sustain pulses. Then, at the end of the sustain period, the erase ramp voltage L3 is generated. Thus, the maintenance period ends.
- the switching element SW3 is turned on to generate the voltage (Va + Vset4) while the switching element Q5 is kept off, and the reference potential A (this embodiment) is generated in the comparator CP1.
- the reference potential A In the embodiment, 0 (V)) and the voltage (Va + Vset4) are compared. Since the reference potential A has a higher potential than the voltage (Va + Vset4), the control signal OC2 output from the comparator CP1 remains “Lo” following the sustain period. Further, the control signal OC1 is also maintained at “Hi” after the sustain period.
- control signal OC1 ′ (for example, the control signal OC1 ′ (1) to the control signal OC1 ′ (12)) is “Hi” and the control signal OC2 is “Lo”, all the scan ICs 55 remain in the “All-Lo” state.
- the reference potential A that is, the drive voltage output from the initialization waveform generating circuit 51 is output from the output terminals of all the scan ICs 55 as it is.
- a predetermined constant current is input to the input terminal IN2 of the Miller integrating circuit 54 that generates the down-ramp voltage, and the input terminal IN2 is set to “Hi”.
- the drain voltage of the switching element Q2 decreases in a ramp shape
- the potential of the reference potential A decreases in a ramp shape
- the output voltage of the scan IC 55 also starts to decrease in a ramp shape.
- control signal SID for controlling the scan IC 55 for outputting the down-ramp voltage L4 is kept at “Hi” as in the case of generating the down-ramp voltage L2.
- the control signals SID (1) to SID (6) are kept at “Hi”.
- the control signals OC1 '(1) to OC1' (6) are kept in the "Hi” state.
- the voltage of the reference potential A that is, the down-ramp voltage is compared with the voltage (Va + Vset4), and the control signal OC2 output from the comparator CP1 has the down-ramp voltage at the reference potential A as the voltage. “Lo” is changed to “Hi” at time t16 which is equal to or less than (Va + Vset4).
- control signal OC1 ′ for example, the control signal OC1 ′ (1) to the control signal OC1 ′
- the scan IC 55 for example, the scan IC (1) to the scan IC (6)
- the control signal OC2 are both “Hi” at time t16, and the scan IC 55 to which the down-ramp voltage L4 is to be output can be set to the “All-Hi” state.
- the voltage output from the scan IC 55 for outputting the down-ramp voltage L4 is the voltage input to the input terminal INb at time t16, that is, the voltage Vc obtained by superimposing the voltage Vscn on the reference potential A.
- the voltage drop is switched to voltage rise at time t16.
- the down-ramp voltage L4 is output from the scan IC 55 for which the down-ramp voltage L4 is to be output, and, for example, the down-ramp voltage L4 having the lowest voltage (Va + Vset4) is applied to the scan electrodes SC1 to SCn / 2. be able to.
- control signal SID for controlling the scan IC 55 for outputting the down-ramp voltage L7 is changed from “Hi” to “Lo” before the time t14, as in the case of generating the down-ramp voltage L5.
- the control signal SID (7) to the control signal SID (12) are changed from “Hi” to “Lo” before the time t14.
- the signal CPO output from the comparator CP2 is output from the OR gate OR (7) to the OR gate OR (12), and from the AND gate AG (7) to the AND gate AG (12), The signal CPO is output as the control signal OC1 ′ (7) to the control signal OC1 ′ (12).
- the comparator CP2 compares the reference potential A with the voltage (Va + Vset5), the signal CPO output from the comparator CP2 starts from “Hi” at time t15 when the reference potential A becomes equal to or lower than the voltage (Va + Vset5). Becomes “Lo”.
- control signal OC1 ′ (for example, the control signal OC1 ′ (7) to the control signal OC1 ′) for controlling the scan IC 55 (for example, the scan IC (7) to the scan IC (12)) to which the down-ramp voltage L7 is to be output. (12)) can be changed from “Hi” to “Lo” at time t15.
- the control signal OC1 ′ and the control signal OC2 for controlling the scan IC 55 for which the down-ramp voltage L7 is to be output are both “Lo” at time t15, and the scan IC 55 for which the down-ramp voltage L7 is to be output is set to the “HiZ” state. can do. Therefore, the output voltage of the scan IC 55 for outputting the down-ramp voltage L7 is a voltage in which the output voltage at the time t15 is held as it is. For example, the lowest voltage is applied to the scan electrode SCn / 2 + 1 to the scan electrode SCn (Va + Vset5). ) Down-ramp voltage L7 can be applied.
- the scan electrode drive circuit 43 decreases from the voltage Vi3 to the voltage (Va + Vset4) from the scan IC 55 (for example, the scan IC (1) to the scan IC (6)) that is desired to output the down-ramp voltage L4.
- the down-ramp voltage L4 is output, and the down-ramp voltage is applied to the scan electrode 22 (for example, the scan electrode SC1 to the scan electrode SCn / 2) to be addressed between the first initialization operation and the second initialization operation. L4 is applied.
- the scan IC 55 (for example, the scan IC (7) to the scan IC (12)) to which the down ramp voltage L7 is to be output outputs the down ramp voltage L7 that decreases from the voltage Vi3 toward the voltage (Va + Vset5).
- Down-ramp voltage L7 is applied to scan electrode 22 (for example, scan electrode SCn / 2 + 1 to scan electrode SCn) to be subjected to an address operation after the initial initialization operation.
- the initialization period ends.
- the subsequent writing period, sustain period, and subsequent operations are the same as those described above.
- the timing chart described above is merely an example of operation.
- the down ramp voltage L2 (or the down ramp voltage L4) is changed according to the change.
- the scan IC 55 that outputs and the scan IC 55 that outputs the down-ramp voltage L5 (or down-ramp voltage L7) are changed.
- the scan IC (1), the scan IC (3), the scan IC (5), the scan IC (7), the scan IC (9), and the scan IC (11) have a down-ramp voltage L2 ( Alternatively, the down ramp voltage L4) is applied, and the scan IC (2), the scan IC (4), the scan IC (6), the scan IC (8), the scan IC (10), and the scan IC (12) are down ramped.
- a voltage L5 (or down-ramp voltage L7) is applied.
- the down ramp voltage applied to the scan IC (1), scan IC (3), scan IC (5), scan IC (7), scan IC (9), and scan IC (11) is the down ramp voltage L2 (or In order to obtain the ramp voltage L4), the scan start signal SID (1), the scan start signal SID (3), the scan start signal SID (5), the scan start signal SID (7), and the scan start are performed during the initialization period.
- the signal SID (9) and the scan start signal SID (11) are maintained at “Hi”, and the scan IC (2), the scan IC (4), the scan IC (6), the scan IC (8), and the scan IC (10).
- scanning is started before time t (3) (or before time t14).
- Signal SID (2), scan start signal SID (4), running Start signal SID (6), scan start signal SID (8), scan start signal SID (10), the scan start signal SID (12) may be from "Hi" to "Lo".
- each scan start signal SID is generated, and in the second address period after the second initialization operation, the scan IC (2), the scan IC (4), the scan IC (6), and the scan IC (8 ), The scan start signal SID may be generated so that the write operation is performed in the order of the scan IC (10) and the scan IC (12).
- the present embodiment by performing the initialization operation a plurality of times, it is possible to increase the area in which the elapsed time from the initialization operation to the write operation can be shortened, and partial lighting The higher the rate, the shorter the elapsed time from the initialization operation to the address operation, so that the address operation can be performed, so that stable address discharge can be generated even in panels with larger screens, higher brightness, and higher definition. Therefore, it is possible to prevent an increase in scan pulse voltage (amplitude) necessary for generating stable address discharge.
- the initial The write operation is performed a plurality of times, and the write operation is performed in each region in such an order that the elapsed time from the initialization operation to the write operation becomes shorter as the partial lighting rate is higher.
- the write operation is performed in the same order.
- the luminance change based on the address discharge on the image display surface of the panel 10 can be smoothed, and the image display quality can be further improved.
- the scan electrode 22 and the scan electrode 22 are adjacent to each other, and the sustain electrode 23 and the sustain electrode 23 are adjacent to each other. ... It is also effective in a panel having an electrode structure of “scan electrode 22, scan electrode 22, sustain electrode 23, sustain electrode 23, scan electrode 22, scan electrode 22,.
- the specific numerical values shown in the embodiment of the present invention are set based on the characteristics of the panel 10 having 50 inches and the number of display electrode pairs 24 of 1080 pairs, and are merely examples in the embodiments. It is just what was shown.
- the present invention is not limited to these numerical values, and each numerical value is desirably set optimally in accordance with the characteristics of the panel 10 and the specifications of the plasma display device 1. Each of these numerical values is allowed to vary within a range where the above-described effect can be obtained.
- the number of subfields and the luminance weight of each subfield are not limited to the values shown in the embodiment of the present invention, and the subfield configuration may be switched based on an image signal or the like. Good.
- the present invention generates a stable address discharge by preventing an increase in scan pulse voltage (amplitude) necessary for generating a stable address discharge even in a panel with a large screen and high definition, Since high image display quality can be realized, it is useful as a driving method of a plasma display device and a panel.
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Abstract
Description
図1は、本発明の実施の形態1におけるパネル10の構造を示す分解斜視図である。ガラス製の前面板21上には、走査電極22と維持電極23とからなる表示電極対24が複数形成されている。そして走査電極22と維持電極23とを覆うように誘電体層25が形成され、その誘電体層25上に保護層26が形成されている。
本実施の形態では、1フィールドに占める輝度重みの割合が所定の割合以上のサブフィールド、または維持期間における維持パルスの発生数が所定の数以上のサブフィールドにおいては、実施の形態1で説明したように、部分点灯率検出回路における検出結果にもとづき部分点灯率が高い領域から先に書込み動作が行われるように走査ICを順次切換えて動作させる。また、1フィールドに占める輝度重みの割合が所定の割合未満のサブフィールド、または維持期間における維持パルスの発生数が所定の数未満のサブフィールドにおいては、あらかじめ定めた順番で走査電極SC1~走査電極SCnに走査パルス電圧Vaを印加して書込み動作を行う。例えば、走査電極SC1から走査電極SCnまで順に走査パルス電圧Vaを印加するように走査ICを動作させる。これにより、書込み放電をさらに安定化し、画像表示品質をさらに向上させることを実現している。
(サブフィールドの輝度)=(そのサブフィールドの維持期間に発生する維持放電による輝度)+(そのサブフィールドの書込み期間に発生する書込み放電による輝度)
しかし、1フィールドに占める輝度重みの割合が高いサブフィールド、または維持期間における維持パルスの発生数が多いサブフィールド(以下、「高サブフィールド」とする)では、維持期間に発生する輝度が、書込み期間に発生する輝度よりも十分に大きくなる。そのため、書込み期間に発生する輝度がそのサブフィールドの輝度に与える影響は実質的に無視できる程度となる。すなわち、高サブフィールドにおける輝度は、次式で表すことができる。
(サブフィールドの輝度)=(そのサブフィールドの維持期間に発生する維持放電による輝度)
一方、1フィールドに占める輝度重みの割合が小さいサブフィールド、または維持期間における維持パルスの発生数が少ないサブフィールド(以下、「低サブフィールド」とする)では、維持期間に発生する輝度が小さくなるので、書込み期間に発生する輝度が相対的に大きくなる。そのため、例えば書込み放電の放電強度が変化して書込み放電による発光輝度が変化すると、その影響を受けて、サブフィールドの輝度が変化するおそれがある。
上述した実施の形態では、検出された部分点灯率にもとづき各領域の書込み動作の順番を決定する動作を、初期化期間にのみ初期化動作を行う駆動(以下、「1相駆動」と呼称する)において行う構成を説明したが、本発明は、何らその構成に限定されるものではない。
初期化期間では、まず、制御信号OC1および制御信号SID(1)~制御信号SID(12)を「Hi」にする。同時に、維持パルス発生回路52のクランプ回路を動作させ、基準電位Aの電位を0(V)にする。基準電位Aの0(V)は、電圧(Va+Vset2)、電圧(Va+Vset3)、電圧(Va+Vset4)のいずれの電圧よりも高いので、比較器CP1から出力される制御信号OC2は「Lo」になる。また、制御信号OC1および制御信号SID(1)~制御信号SID(12)はいずれも「Hi」なので、アンドゲートAG(1)~アンドゲートAG(12)から出力される制御信号OC1’(1)~制御信号OC1’(12)も「Hi」になる。これにより、全ての走査IC55が「All‐Lo」の状態になり、基準電位Aの0(V)が走査IC55の出力電圧となる。
書込み期間では、図示はしていないが、スイッチング素子Q5をオンにして、基準電位Aを負の電圧Vaに維持する。また、スイッチング素子SW1およびスイッチング素子SW3をオフにし、スイッチング素子SW2をオンにして電圧(Va+Vset3)を発生させ、比較器CP1において、基準電位A、すなわち負の電圧Vaと電圧(Va+Vset3)とが比較されるようにしておく。したがって、この間は基準電位Aの方が電圧(Va+Vset3)よりも電位が低いので、比較器CP1から出力される制御信号OC2は「Hi」となる。
そして、全ての走査電極22への書込み動作が終了して書込み期間が終了した後の時刻t13で、制御信号OC1を「Hi」にする。走査開始信号SID(例えば、走査開始信号SID(1)~走査開始信号SID(12))は「Hi」に維持されたままなので、アンドゲートAGから出力される制御信号OC1’(例えば、制御信号OC1’(1)~制御信号OC1’(12))も「Hi」になる。
続く初期化期間では、図示はしていないが、スイッチング素子Q5はオフに維持したまま、スイッチング素子SW3をオンにして電圧(Va+Vset4)を発生させ、比較器CP1において、基準電位A(本実施の形態では、0(V))と電圧(Va+Vset4)とが比較されるようにしておく。基準電位Aの方が電圧(Va+Vset4)よりも電位が高いので、比較器CP1から出力される制御信号OC2は、維持期間に引き続き「Lo」のままである。また、制御信号OC1も維持期間に引き続き「Hi」に維持したままにしておく。
10 パネル
21 前面板
22 走査電極
23 維持電極
24 表示電極対
25,33 誘電体層
26 保護層
31 背面板
32 データ電極
34 隔壁
35 蛍光体層
41 画像信号処理回路
42 データ電極駆動回路
43,49 走査電極駆動回路
44 維持電極駆動回路
45,46 タイミング発生回路
47 部分点灯率検出回路
48 点灯率比較回路
50,56 走査パルス発生回路
51 初期化波形発生回路
52 維持パルス発生回路
53,54 ミラー積分回路
55 走査IC
60 走査IC切換え回路
61 SID発生回路
62,65 FF(フリップフロップ回路)
63 遅延回路
64,66 アンドゲート
72 スイッチ
CP1,CP2 比較器
Q1,Q2,Q4,Q5,QH1~QHn,QL1~QLn,SW1,SW2,SW3 スイッチング素子
R1,R2 抵抗
C1,C2,C31 コンデンサ
D31 ダイオード
OR オアゲート
AG アンドゲート
Claims (6)
- 初期化期間と書込み期間と維持期間とを有するサブフィールドを1フィールド内に複数設け、サブフィールド毎に輝度重みを設定するとともに前記維持期間に輝度重みに応じた数の維持パルスを発生して階調表示するサブフィールド法で駆動し、走査電極と維持電極とからなる表示電極対を有する放電セルを複数備えたプラズマディスプレイパネルと、
前記書込み期間に、前記走査電極に走査パルスを印加して書込み動作を行う走査電極駆動回路と、
前記プラズマディスプレイパネルの表示領域を複数の領域に分け、前記領域毎に、全ての放電セル数に対する点灯させるべき放電セル数の割合を部分点灯率としてそれぞれのサブフィールド毎に検出する部分点灯率検出回路とを備え、
前記走査電極駆動回路は、
前記初期化期間に第1の初期化動作を行うとともに、前記書込み期間に第2の初期化動作を行い、
前記部分点灯率検出回路において検出された前記部分点灯率が最も大きい前記領域の前記書込み動作を前記第1の初期化動作の直後に行い、2番目に前記部分点灯率が大きい前記領域の前記書込み動作を前記第2の初期化動作の直後に行うことを特徴とするプラズマディスプレイ装置。 - 初期化期間と書込み期間と維持期間とを有するサブフィールドを1フィールド内に複数設け、サブフィールド毎に輝度重みを設定するとともに前記維持期間に輝度重みに応じた数の維持パルスを発生して階調表示するサブフィールド法で駆動し、走査電極と維持電極とからなる表示電極対を有する放電セルを複数備えたプラズマディスプレイパネルと、
前記書込み期間に、前記走査電極に走査パルスを印加して書込み動作を行う走査電極駆動回路と、
前記プラズマディスプレイパネルの表示領域を複数の領域に分け、前記領域毎に、全ての放電セル数に対する点灯させるべき放電セル数の割合を部分点灯率としてそれぞれのサブフィールド毎に検出する部分点灯率検出回路とを備え、
前記走査電極駆動回路は、
前記初期化期間に第1の初期化動作を行うとともに、前記書込み期間に第2の初期化動作を行い、
前記部分点灯率検出回路において検出された前記部分点灯率が最も大きい前記領域の前記書込み動作を前記第2の初期化動作の直後に行い、2番目に前記部分点灯率が大きい前記領域の前記書込み動作を前記第1の初期化動作の直後に行うことを特徴とするプラズマディスプレイ装置。 - 前記走査電極駆動回路は、
前記部分点灯率検出回路において検出された前記部分点灯率の大きさが3番目以降の前記領域は、前記部分点灯率が大きい領域ほど初期化動作から前記書込み動作までの経過時間が短くなるような順番で前記領域の前記書込み動作を行うことを特徴とする請求項1または請求項2に記載のプラズマディスプレイ装置。 - 前記走査電極駆動回路は、複数の前記走査電極に対して前記書込み動作を行うことができる走査ICを複数有し、
前記部分点灯率検出回路は、1つの前記走査ICに接続された複数の前記走査電極で構成される領域を1つの前記領域とすることを特徴とする請求項1または請求項2に記載のプラズマディスプレイ装置。 - 走査電極と維持電極とからなる表示電極対を有する放電セルを複数備えたプラズマディスプレイパネルを、初期化期間と書込み期間と維持期間とを有するサブフィールドを1フィールド内に複数設け、サブフィールド毎に輝度重みを設けるとともに、前記書込み期間においては前記走査電極に走査パルスを印加して書込み動作を行い、前記維持期間においては輝度重みに応じた数の維持パルスを発生して階調表示するサブフィールド法で駆動するプラズマディスプレイパネルの駆動方法であって、
前記初期化期間に第1の初期化動作を行うとともに、前記書込み期間に第2の初期化動作を行い、
前記プラズマディスプレイパネルの表示領域を複数の領域に分け、前記領域毎に、全ての放電セル数に対する点灯させるべき放電セル数の割合を部分点灯率としてそれぞれのサブフィールド毎に検出し、
検出された前記部分点灯率が最も大きい前記領域の前記書込み動作を前記第1の初期化動作の直後に行い、2番目に前記部分点灯率が大きい前記領域の前記書込み動作を前記第2の初期化動作の直後に行うことを特徴とするプラズマディスプレイパネルの駆動方法。 - 走査電極と維持電極とからなる表示電極対を有する放電セルを複数備えたプラズマディスプレイパネルを、初期化期間と書込み期間と維持期間とを有するサブフィールドを1フィールド内に複数設け、サブフィールド毎に輝度重みを設けるとともに、前記書込み期間においては前記走査電極に走査パルスを印加して書込み動作を行い、前記維持期間においては輝度重みに応じた数の維持パルスを発生して階調表示するサブフィールド法で駆動するプラズマディスプレイパネルの駆動方法であって、
前記初期化期間に第1の初期化動作を行うとともに、前記書込み期間に第2の初期化動作を行い、
前記プラズマディスプレイパネルの表示領域を複数の領域に分け、前記領域毎に、全ての放電セル数に対する点灯させるべき放電セル数の割合を部分点灯率としてそれぞれのサブフィールド毎に検出し、
検出された前記部分点灯率が最も大きい前記領域の前記書込み動作を前記第2の初期化動作の直後に行い、2番目に前記部分点灯率が大きい前記領域の前記書込み動作を前記第1の初期化動作の直後に行うことを特徴とするプラズマディスプレイパネルの駆動方法。
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