WO2011151957A1 - プラズマディスプレイパネル及び表示装置 - Google Patents
プラズマディスプレイパネル及び表示装置 Download PDFInfo
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- WO2011151957A1 WO2011151957A1 PCT/JP2011/001564 JP2011001564W WO2011151957A1 WO 2011151957 A1 WO2011151957 A1 WO 2011151957A1 JP 2011001564 W JP2011001564 W JP 2011001564W WO 2011151957 A1 WO2011151957 A1 WO 2011151957A1
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
- H01J11/10—AC-PDPs with at least one main electrode being out of contact with the plasma
- H01J11/12—AC-PDPs with at least one main electrode being out of contact with the plasma with main electrodes provided on both sides of the discharge space
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
- H01J11/20—Constructional details
- H01J11/34—Vessels, containers or parts thereof, e.g. substrates
- H01J11/36—Spacers, barriers, ribs, partitions or the like
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
- H01J11/20—Constructional details
- H01J11/50—Filling, e.g. selection of gas mixture
Definitions
- the present invention relates to a plasma display panel and a display device using the same, and particularly to a high-definition plasma display panel.
- the most commonly used method for generating discharge plasma inside a cell is a method called a surface discharge AC type.
- a general structure of the surface discharge AC type PDP is that a gap called a rib is provided between two glass substrates (a front plate and a back plate) to secure a gap of a certain distance, and the gap and the two pieces are provided.
- the discharge space surrounded by the glass substrate is filled with a discharge gas, and parallel electrode pairs called scan electrodes and sustain electrodes are formed in stripes on the surface of the front plate in contact with the discharge space, and an insulating layer is formed thereon. Is formed.
- a data electrode is arranged on the back plate in a form orthogonal to the electrode group of the front plate, and an insulating layer is coated thereon.
- the discharge gas in the discharge cell is broken down to generate discharge plasma.
- the insulating layer is formed on the scan electrode and the sustain electrode, the electric charge generated by the discharge accumulates on the surface of the insulating layer and cancels the potential of each electrode.
- discharge is generated in a pulsed manner when voltage is applied and wall charges are accumulated.
- the applied voltage is reversed, it is superimposed on the same polarity as the reversed applied voltage, so that the application necessary for maintaining the discharge is applied. The voltage is reduced. Further, by controlling this wall charge, it is possible to select ON / OFF of discharge in each discharge cell, and to display an image.
- Patent Document 1 the partial pressure of xenon in the discharge gas is increased and the total pressure of the discharge gas is increased.
- This uses not a resonant radiation (wavelength 147 nm) from an excited xenon atom but a broadband light emission centered at 172 nm from an excited dimer (excimer; hereinafter referred to as excimer) as an ultraviolet light source. Is intended.
- An excimer is a three-body reaction between an excited xenon atom and an atom in the ground state, such as Xe * + Xe + Xe ⁇ Xe 2 * + Xe (Formula 1)
- the formation probability increases rapidly as the xenon partial pressure increases.
- the ground state since the ground state has a repulsive potential, it rapidly dissociates into single atoms, so self-absorption does not occur, and high luminous efficiency can be obtained even at high gas pressure.
- the PDP it is effective to set the partial pressure of xenon high in order to increase the light emission efficiency.
- the discharge electrode is covered with the dielectric layer and the protective film on the surface thereof, and the supply of the discharge current depends on the secondary electron emission process by the ion rush into the surface of the protective film. And since xenon has a lower ionization voltage than neon, its secondary electron emission coefficient is low.
- the cathode fall voltage increases because more xenon ions need to be accelerated toward the protective film to supply secondary electrons, and as a result, the discharge voltage increases.
- An increase in the discharge voltage is not preferable because it increases the burden on the drive circuit components and causes a cost increase such as the use of high-voltage components.
- the upper limit of the partial pressure of xenon in the discharge gas is about 25%.
- the present invention has been made in view of the above-described problems, and an object of the present invention is to improve luminous efficiency while maintaining life characteristics while suppressing discharge voltage in a PDP having minute cells corresponding to ultra-high definition.
- the present invention provides a pair of substrates opposed to each other with a gap, and the gap is partitioned by a rib to form a plurality of discharge cells.
- the minimum width of the discharge space defined by the rib immediately below the discharge electrode pair is 65 ⁇ m or more and 100 ⁇ m or less.
- the discharge gas is composed mainly of xenon, neon, and helium, the xenon partial pressure ratio is 15% to 25%, the helium partial pressure ratio is 20% to 50%, and the total pressure is 60 kPa to 70 kPa.
- minimum width of the discharge space defined by the ribs directly under the discharge electrode pair refers to the minimum value of the width along the substrate surface on which the discharge electrode pair is provided in the discharge space.
- a display device includes the PDP and a drive circuit that drives the PDP.
- the drive circuit divides a plurality of discharge electrode pairs into a plurality of display electrode pair groups, and maintains an address period for generating an address discharge in the discharge cells and a sustain discharge in the discharge cells for each display electrode pair group.
- N is an integer of 2 or more
- Tw driving is performed such that the time of the sustain period of each subfield of each display electrode pair group is set to Tw ⁇ (N ⁇ 1) / N or less.
- the main components of the discharge gas are xenon, neon, and helium, and the xenon partial pressure is set to 25% or less. So life characteristics can be kept. Further, since the partial pressure ratio of helium is set to 20% or more and 50% or less and the total pressure is set to 60 kPa or more and 70 kPa or less, it is possible to obtain high luminous efficiency while suppressing an increase in discharge voltage.
- the display device can obtain high emission luminance even in a high-definition PDP by driving the PDP with the above-described method, so that the display device has high definition, high emission efficiency, and high luminance. Images can be displayed.
- the width of the discharge cell varies depending on the measurement location.
- the “minimum width of the discharge space defined by the ribs directly under the discharge electrode pair” is defined as the discharge cell. This is because, among the widths, it is considered that the minimum width when measured at a position close to the discharge electrode pair has a great influence on the light emission efficiency.
- FIG. 1 is an exploded perspective view showing a configuration of a PDP according to a first exemplary embodiment. It is a figure which shows the schematic cross section of the said PDP.
- FIG. 5 is a characteristic diagram showing the relationship between discharge gas total pressure and luminous efficiency in an experimental PDP.
- FIG. 6 is a characteristic diagram showing a relationship between a helium partial pressure ratio and luminous efficiency in an experimental PDP.
- FIG. 6 is a characteristic diagram showing the relationship between the discharge gas total pressure and the discharge sustaining voltage in the experimental PDP.
- FIG. 6 is a characteristic diagram showing the relationship between the total pressure of the discharge gas and the relative efficiency for each helium partial pressure ratio and discharge space width in the experimental PDP.
- FIG. 6 is a circuit block diagram of a display device according to a second embodiment. It is a circuit diagram of a scan electrode driving circuit in the PDP device. It is a circuit diagram of the sustain electrode drive circuit in the PDP device.
- FIG. 10 is an electrode array diagram of a panel of another PDP device according to the second exemplary embodiment; It is a circuit diagram of a scan electrode driving circuit in the PDP device.
- FIG. 10 is an electrode array diagram of a panel of another PDP device according to the second exemplary embodiment; It is a circuit diagram of a scan electrode drive circuit according to the PDP device. It is a circuit diagram of the sustain electrode drive circuit concerning the said PDP apparatus.
- FIG. 1 is a schematic diagram illustrating a structure of an AC type PDP 100 according to the first embodiment.
- this PDP 100 is a cross-shaped rib 3 formed by molding and sintering a low-melting glass paste between a front plate 1 and a back plate 2 which are flat substrates made of soda lime glass. Are arranged, and the space defined by the ribs 3 is maintained between the front plate 1 and the back plate 2, and each of the substantially rectangular parallelepiped spaces surrounded by the rib 3, the front plate 1, and the back plate 2 is a discharge cell. 11
- the pitch L of the ribs 3 extending in the vertical direction is 95 ⁇ m
- the pitch of the ribs 3 extending in the horizontal direction is 275 ⁇ m.
- This size is intended to satisfy the next generation high-definition standard (4k2k) of 4096 ⁇ 2060 pixels with a screen size of 50 inches diagonal.
- the front plate 1 and the back plate 2 can also use other translucent materials, for example, high melting point glass such as borosilicate glass. Further, by using a photosensitive paste material as the material of the rib 3, it is possible to improve the accuracy of the shape.
- a plurality of pairs of discharge electrodes 4 each consisting of a laterally extending electrode Sus and an electrode Scn are formed so as to face each discharge cell 11.
- the electrode Sus and the electrode Scn are made of a transparent conductive material such as ITO in consideration of light extraction, and have a structure in which silver is partially laminated to ensure electrical conductivity.
- a surface of the front plate 1 on the discharge cell 11 side is formed with a dielectric layer 5 made of silicon oxide (SiO 2 ) on the entire surface so as to cover the sustain electrode Sus and the scan electrode Scn, and is a protective film that is a deposited film of magnesium oxide 6 is covered.
- the dielectric layer 5 acts as a charge barrier against the discharge current, and the protective film 6 protects the dielectric layer 5 from sputtering due to charge bombardment from the discharge plasma, and discharges by supplying secondary electrons during discharge. Contributes to voltage reduction.
- the discharge electrode pair 4 has a structure in which silver is laminated on the ITO layer as described above, but ITO is omitted from the viewpoint of cost, or other transparent conductive materials such as ZnO-based and SnO are used. Two- system materials can also be used.
- striped data electrodes 7 are formed in a vertical direction perpendicular to the discharge electrode pairs 4 so as to correspond to the respective discharge cells 11. All the discharge cells 11 are present at the intersection of the discharge electrode pair 4 on the front plate 1 side and the data electrode 7 on the back plate 2 side.
- the back plate 2 and the data electrode 7 are also covered with the base dielectric layer 8 in the same manner as the front plate 1.
- a phosphor layer 9 is formed that emits visible light when excited by ultraviolet rays emitted by discharge from xenon or the like.
- the discharge cell 11 has a red discharge cell 11R, a green discharge cell 11G, and a blue discharge cell which are the three primary colors of light depending on the emission color of the phosphor layer 9 formed on the inner surface thereof.
- One pixel is formed by combining three of 11B.
- the discharge space partitioned by the rib 3 between the front plate 1 and the back plate 2 is filled with a discharge gas.
- a discharge gas consists of xenon, neon and helium.
- PDP discharge operation In the method of driving the PDP 100, one field is composed of a plurality of subfields, and in each subfield, writing is performed by applying a voltage to the scan electrode Scn and the data electrode 7 and writing to the discharge cells of the entire panel. Is performed, a predetermined AC rectangular wave pulse voltage is applied between all the sustain electrodes Sus and the scan electrodes Scn.
- wall charges having a polarity opposite to the electrode potential are accumulated on the surface of the protective film 6 covering each discharge electrode pair 4. Since the electric field generated by the accumulated wall charges cancels out the electric field generated by the voltage applied to the electrodes, the electric field contributing to the discharge does not exist effectively in the discharge cell 11 and the discharge stops.
- the sustain electrode Sus becomes the instantaneous anode and the scan electrode Scn becomes the instantaneous cathode after half a cycle.
- the electric field created by the wall charges accumulated in the previous discharge has the same polarity as the potential of the electrode, and is therefore superimposed on the applied voltage. That is, during voltage reversal, a voltage corresponding to (applied voltage + voltage due to wall charges) is applied to the inside of the discharge cell 11.
- the voltage applied to the discharge cell 11 can be lower than the voltage actually required for sustaining the discharge, and the pixel selection operation by the address discharge using the data electrode 7 is performed to turn on / off with a small number of signals. Can be controlled.
- FIG. 2 is a view showing a cross section of the PDP 100 shown in FIG. 1 cut in the horizontal direction, and shows one cell equivalent.
- the lateral width D (the gap between the inner walls of the ribs 3 adjacent in the lateral direction) immediately below the discharge electrode pair 4 is set in the range of 65 ⁇ m to 100 ⁇ m.
- the shape of the discharge space in each discharge cell is smaller in width than the length in the vertical direction as shown in FIG. That is, since the depth of the discharge cell is about 100 ⁇ m, the horizontal width is smaller than the vertical width of the discharge space, and the horizontal width D of the discharge space is the minimum width of the discharge space.
- the influence of the width D on the discharge voltage is great. That is, in general, in a surface discharge method such as PDP 100, the discharge path in the discharge cell 11 is biased toward the front plate 1 and is spread in a direction parallel to the discharge electrode pair 4 (that is, in the width D direction). For this reason, the influence of the dimension in the depth direction on the discharge voltage is relatively small compared to the influence of the dimension of the width D on the discharge voltage.
- the width d of the top portion of each rib 3 extending in the vertical direction is 20 ⁇ m, and the pitch is 95 ⁇ m.
- the gap width D between the ribs 3 adjacent in the lateral direction is 75 ⁇ m.
- the partial pressure ratio of xenon is set within a range of 15% to 25%, and the partial pressure ratio of helium is set within a range of 20% to 50%.
- the total pressure is preferably set to 60 kPa or more and 70 kPa or less.
- the discharge gas has a partial pressure ratio of 20% xenon, 40% helium, and 40% neon, and the total pressure of the discharge gas is 60 kPa.
- High luminous efficiency can be obtained by setting the composition and pressure of the discharge gas as described above.
- the discharge cell 11 corresponds to one pixel of the screen (exactly one color is displayed), the discharge light emitter is very small. For this reason, the interval between the electrodes that cause discharge (sustain electrode Sus and scan electrode Scn) is very narrow, and the well-known relationship between the electrode distance of discharge, the product of gas pressure, and the discharge start voltage (Paschen's law) In order to keep the discharge voltage low, the gas pressure must be high, and is generally on the order of 10 2 kPa. In such a pressure region, the excited atom of xenon undergoes a three-body collision process with another atom.
- M is an atom in the ground state of the same xenon, or an atom in the ground state of other gas such as neon or argon contained during discharge.
- the excimer Xe 2 * thus formed emits broadband ultraviolet light having a peak near 172 nm with high efficiency. Further, the lower level Xe 2 radiating ultraviolet rays is unstable because it has a repulsive potential, and quickly dissociates into two xenon atoms. Therefore, the loss of ultraviolet rays due to self-absorption as seen in the resonance emission line does not occur.
- the xenon partial pressure ratio is set to 15% to 25%
- the helium partial pressure ratio is set to 20% to 50%
- the discharge is performed. It has been found that the total pressure of the gas is set to 60 kPa or more and 70 kPa or less, and thereby, light emission display can be performed with higher efficiency.
- Experiment 1 (Experiment on composition and pressure of discharge gas): As a discharge gas, a mixed gas in which helium is added to a xenon + neon mixed gas is prepared. Here, in each discharge gas component, the xenon partial pressure ratio is kept constant at 20%, and the He partial pressure ratio is changed in the range of 0 to 50%.
- Test panel by filling the prepared discharge gas into the panel, but change the total pressure to fill the discharge gas within the range of 30-70kPa.
- the luminance measured by a luminance meter placed vertically above each panel was integrated with the light emission area and all solid angles of the test panel to obtain the total luminous flux.
- the power consumption in the lighting state of the test panel was obtained from the sustain voltage and the panel discharge current, and the luminous efficiency (lm / W) was obtained by dividing the total luminous flux by this power consumption.
- the panel discharge current is obtained by subtracting the charge current to the capacitive component such as the discharge electrode pair 4 in the non-lighting state from the total current flowing during lighting.
- FIG. 3 to 5 are graphs showing the measurement results, and FIG. 3 plots the total pressure of the mixed gas on the horizontal axis and the luminous efficiency on the vertical axis.
- FIG. 3 shows that the efficiency increases as the total pressure increases at any helium partial pressure ratio. In the case of no helium, the increase in efficiency tended to peak in a high total pressure region of 50 kPa or more. This is the same as the data disclosed in FIG.
- FIG. 4 is a plot of helium partial pressure on the horizontal axis and luminous efficiency on the vertical axis for each of the total pressures of 50 kPa, 60 kPa, and 70 kPa.
- the efficiency is rather lowered by adding helium at a total pressure of 50 kPa.
- efficiency is improved by adding 20% to 50% helium.
- efficiency peaks are observed when the helium partial pressure is in the range of 30% to 40%.
- the partial pressure ratio of helium is in the range of 20% to 50%.
- the partial pressure ratio of helium is in the range of 30% to 40%.
- FIG. 5 is a plot of total pressure on the horizontal axis and discharge sustaining voltage on the vertical axis for each helium partial pressure.
- the former dimensions generally correspond to the cell size of 42-inch full high-definition panels that are already marketed by various companies and are becoming mainstream in home digital television.
- the latter dimensions are 37-inch full high-definition panels. Is equivalent to the cell size.
- the efficiency was examined.
- FIG. 6 is a characteristic diagram showing the result, showing the relationship between the total pressure and the luminous efficiency. Note that the luminous efficiency is shown as a relative efficiency, assuming that no helium is added in each cell size.
- the efficiency is higher when helium is not added on the low total pressure side with the total pressure around 50 kPa as the boundary, and the efficiency is increased when helium is added on the high total pressure side.
- the tendency to increase is clear.
- FIG. 7 is a characteristic diagram showing the relationship between the discharge space width and the luminous efficiency for a PDP with 30% helium added and a PDP with 50% helium added.
- the luminous efficiency is plotted as relative efficiency with the luminous efficiency when no helium is added in each discharge space width being 1.
- the luminous efficiency is improved by 3% or more in the range where the discharge space width D is 100 ⁇ m or less regardless of whether the helium partial pressure is 30% or 50%. Therefore, it can be seen that when the discharge space width D is 100 ⁇ m or less, the luminous efficiency is improved by adding helium. On the other hand, it can be seen from the results of FIG. 7 that if the discharge space width D exceeds 100 ⁇ m, the effect of improving the luminous efficiency cannot be expected much even if helium is added.
- the effect of improving the light emission efficiency by adding helium to the discharge gas as described above is an effect that can be obtained specifically in a PDP having a small cell size with a discharge space width D of 100 ⁇ m or less. Recognize.
- the discharge gas has a xenon partial pressure of about 10% and Ne and He are also added.
- the minimum width D of the cell size is small. When it becomes smaller than 100 ⁇ m, the luminous efficiency is essentially lowered. Therefore, it is difficult to obtain a practical luminance as a television with the setting of the discharge gas disclosed in this document.
- a xenon atom is ionized when energy of 12.13 eV is obtained from an electron by collision with the electron, and becomes a xenon ion.
- Direct (impact) ionization process Xe + e ⁇ Xe + + 2e (Formula 3) It is a reaction represented by
- the excitation level group (first excitation level) having the lowest energy of the xenon atom emits 147 nm ultraviolet photons called resonance lines, or emits light with high efficiency centering on 172 nm as an excimer. Because it is especially important.
- the discharge mechanism in the PDP is called a dielectric barrier discharge.
- a dielectric layer 5 and a protective film 6 are arranged between the discharge electrode pair 4 and the discharge space, and act as a current barrier. To do. The progress of the discharge proceeds in the following steps.
- helium has a very high ionization voltage of 24.6 V, it can be expected that the secondary electron emission coefficient is high when ions collide with the protective film. Further, since the mass number is small and the mobility is high, it can be easily accelerated in the cathode descending region and reach the protective film. That is, a large number of secondary electrons can be obtained with a smaller ion current.
- the ion current is inhibited by the charge exchange reaction caused by the same kind of atom-ion collision, but when helium is added to the xenon + neon gas, the partial pressure of neon is relatively lowered. Since the charge exchange reaction is suppressed, neon ions can be accelerated easily. This also suppresses the ion current and leads to an increase in secondary electron emission efficiency.
- the power consumption in the discharge can be considered to be substantially the product of the voltage in the cathode drop region and the ionic current. It leads to reduction of power consumption.
- helium is difficult to ionize because of its high ionization voltage. Therefore, when the helium partial pressure is increased, it is necessary to increase the applied voltage in order to produce helium ions.
- the plasma density decreases and the conductivity decreases, the electric field strength inside the plasma increases and the electron temperature increases. As a result, the excitation efficiency of xenon is increased and the light emission efficiency is improved.
- the discharge sustaining voltage also rises in the actual PDP when the discharge space width is set to be small as in the above experimental results.
- a PDP with a discharge space width of 120 ⁇ m has been put into practical use as a 42-inch full high-definition television.
- the discharge sustaining voltage is expected to increase by about 20V. .
- the minimum width of the discharge space is set to 75 ⁇ m or more.
- a higher effect can be expected in principle with a smaller discharge space width.
- the discharge space width in the case of the minimum cell pitch that can stably form the discharge space is about 65 ⁇ m.
- the change in the sustaining voltage due to the cell size and the change in behavior due to the discharge gas can be quantitatively grasped only after actually making a PDP prototype and conducting an experiment.
- the inventors of the present application are the first in the world to manufacture a very high-definition panel capable of realizing 4k2k resolution with a 50-inch screen size, and by conducting an experiment, a discharge space having a very small size with a discharge space width of 100 ⁇ m or less. It was found that there is a condition that can achieve both high efficiency and life characteristics.
- components other than xenon, neon, and helium may be contained at an impurity level (approximately 10 ppm or less). However, mixing of other gas components at a level higher than this may cause an increase in the discharge voltage. This is not preferable because it leads to a decrease in luminous efficiency.
- the reason is mainly as follows.
- molecular gases such as oxygen, nitrogen, and carbon dioxide may be mixed in a normal exhaust / gas filling process. If these molecular gases are present in the discharge gas, plasma is generated. Among them, excitation of vibration / rotation levels easily occurs. As a result, the electron temperature is extremely lowered and the xenon excitation efficiency is lowered.
- rare gases argon, krypton
- argon, krypton monoatomic molecules have lower ionization voltage than neon and helium, so when these rare gases are mixed, the ionization probability of neon and helium decreases.
- the secondary electron emission coefficient decreases, and the effect of improving the discharge efficiency by helium ions decreases, leading to an increase in the discharge sustaining voltage and a decrease in the light emission efficiency.
- the structure of the PDP is the same as that of the PDP described in the first embodiment, but the method for driving the PDP is the pure wave driving method.
- FIG. 9 is an exploded perspective view showing a schematic configuration of the PDP 10 according to the present embodiment.
- a plurality of display electrode pairs 24 each composed of a scan electrode 22 and a sustain electrode 23 are formed on a transparent insulating front substrate 21.
- a dielectric layer 25 is formed so as to cover the display electrode pair 24, and a protective layer 26 is formed on the dielectric layer 25.
- the scan electrode 22 has a transparent electrode 22a
- the sustain electrode 23 also has a transparent electrode 23a.
- Bus electrodes 22b and 23b are stacked on the transparent electrodes 22a and 23a.
- a plurality of data electrodes 32 are formed on an insulating back substrate 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 red, green, and blue light is provided on the side surface of the partition wall 34 and on the dielectric layer 33.
- the front substrate 21 and the rear substrate 31 are arranged to face each other so that the display electrode pair 24 and the data electrode 32 intersect each other with a minute discharge space interposed therebetween, and the outer periphery thereof is sealed with a sealing material such as glass frit. Has been.
- a discharge gas a mixed gas consisting mainly of xenon, neon and helium, a xenon partial pressure ratio of 15% to 25%, and a helium partial pressure ratio of 20% to 50% is sealed.
- the total pressure of the discharge gas is 60 kPa to 70 kPa.
- the discharge space is divided into a plurality of sections by the partition wall 34, and a discharge cell is formed at each position where the display electrode pair 24 and the data electrode 32 intersect.
- these discharge cells discharge and emit light, an image is displayed on the PDP 10.
- the structure of the PDP 10 is not limited to that described above, and may be a structure having striped partition walls, for example.
- FIG. 10 is an electrode array diagram of the PDP 10.
- the data electrodes D1 to Dm data electrodes 32 in FIG. 9) are arranged.
- M ⁇ n are formed in the space.
- the 2160 display electrode pairs including the scan electrodes SC1 to SC2160 and the sustain electrodes SU1 to SU2160 are divided into a plurality of display electrode pair groups. Although how to divide the display electrode pair groups will be described later, in this embodiment, the PDP is divided into two display electrode pair groups by dividing the PDP into two vertically. As shown in FIG. 10, a display electrode pair located in the upper half of the panel is a first display electrode pair group, and a display electrode pair located in the lower half of the panel is a second display electrode pair group.
- 1080 scan electrodes SC1 to SC1080 and 1080 sustain electrodes SU1 to SU1080 belong to the first display electrode pair group
- 1080 scan electrodes SC1081 to SC2160 and 1080 sustain electrodes SU1081 to SU2160 are the second display electrodes. It belongs to the display electrode pair group.
- the timing of the scan pulse and the address pulse is set so that the address operation is continuously performed except for the initialization period.
- FIG. 11 is a diagram for explaining a subfield configuration setting method in the plasma display apparatus according to the second embodiment.
- the vertical axis represents scan electrodes SC1 to SC2160
- the horizontal axis represents time.
- the timing for performing the write operation is indicated by a solid line
- the timing of the sustain period and the erase period described later is indicated by hatching.
- the time for one field period is 16.7 ms.
- an initializing period for generating initializing discharges simultaneously in all the discharge cells is provided.
- the time required for the initialization period is 500 ⁇ s.
- the time Tw required for sequentially applying the scan pulses to the scan electrodes SC1 to SC2160 is estimated. At this time, it is desirable to apply the scan pulse as short as possible and continuously as much as possible so that the writing operation is continuously performed.
- the time required for the write operation per scan electrode is 0.7 ⁇ s
- the number of display electrode pair groups is determined based on the required number of sustain pulses.
- the sustain pulse period is 10 ⁇ s
- the number N of display electrode pair groups is obtained based on the following formula using the time Tw required to perform the write operation once for all the scan electrodes and the maximum time Ts for applying the sustain pulse.
- N N ⁇ Tw / (Tw ⁇ Ts)
- the display electrode pairs arranged on the entire panel are divided into two display electrode pair groups. Then, as shown in FIG. 11D, for each display electrode pair group, writing is performed on the scan electrodes belonging to the group, and a sustain period for applying a sustain pulse is provided immediately after the write period.
- the maximum time Ts required to apply the sustain pulse is important in determining the driving method of the PDP 10 and the number of display electrode pair groups.
- Ts ⁇ Tw ⁇ (N ⁇ 1) / N This indicates that the time length of the sustain period of each subfield in each display electrode pair should be set to be equal to or less than time Ts.
- the driving method for driving the PDP 10 and the number of display electrode pair groups can be determined.
- both the sustain period and the erase period are indicated by hatching from the upper right to the lower left.
- the erasing period is ignored, but it is desirable to set so that no writing operation is performed when any of the display electrode pair groups is in the erasing period. This is not only for erasing the wall voltage in the erasing period, but also for adjusting the wall voltage on the data electrode in preparation for the writing operation in the next writing period, so the voltage of the data electrode is fixed in the erasing period. It is desirable to keep it.
- FIG. 12 is a diagram illustrating an example of a driving voltage waveform applied to each electrode of the PDP 10.
- an initializing period for generating an initializing discharge in each discharge cell is provided at the beginning of one field. Further, after the sustain period of each subfield of each display electrode pair group, there is provided an erase period for generating an erase discharge for the discharge cells discharged in the sustain period.
- FIG. 12 shows the initialization period, the writing periods of SF1 to SF2 and SF3 for the first display electrode pair group, and SF1 to SF2 for the second display electrode pair group.
- Initialization period In the initialization period, voltage 0 (V) is applied to data electrodes D1 to Dm and sustain electrodes SU1 to SU2160, respectively, and scan waveform SC1 to SC2160 has a ramp waveform voltage that gradually increases from voltage Vi1 to voltage Vi2. Apply. While this ramp waveform voltage rises, a weak initializing discharge is generated between scan electrodes SC1 to SC2160, sustain electrodes SU1 to SU2160, and data electrodes D1 to Dm. Negative wall voltage is accumulated on scan electrodes SC1 to SC2160, and positive wall voltage is accumulated on data electrodes D1 to Dm and sustain electrodes SU1 to SU2160.
- the wall voltage on the electrode represents a voltage generated by wall charges accumulated on the dielectric layer covering the electrode, the protective layer, the phosphor layer, and the like. Note that a positive voltage Vd may be applied to the data electrodes D1 to Dm during this period.
- a positive constant voltage Ve1 is applied to sustain electrodes SU1 to SU2160, and a ramp waveform voltage that gently decreases from voltage Vi3 to voltage Vi4 is applied to scan electrodes SC1 to SC2160.
- a weak initializing discharge is generated between scan electrodes SC1 to SC2160, sustain electrodes SU1 to SU2160, and data electrodes D1 to Dm.
- the negative wall voltage on scan electrodes SC1 to SC2160 and the positive wall voltage on sustain electrodes SU1 to SU2160 are weakened, and the positive wall voltage on data electrodes D1 to Dm is adjusted to a value suitable for the write operation.
- voltage Vc is applied to scan electrodes SC1 to SC2160.
- SF1 writing period An address period of SF1 for the first display electrode pair group will be described.
- the positive constant voltage Ve2 is applied to the sustain electrodes SU1 to SU1080.
- a scan pulse having a negative voltage Va is applied to the scan electrode SC1
- the voltage difference at the intersection between the data electrode Dk and the scan electrode SC1 is obtained by adding the wall voltage on the data electrode Dk and the wall voltage on the scan electrode SC1 to the difference between the externally applied voltages (Vd ⁇ Va).
- the discharge start voltage is exceeded.
- a discharge starts between data electrode Dk and scan electrode SC1 progresses to a discharge between sustain electrode SU1 and scan electrode SC1, and an address discharge is generated.
- a positive wall voltage is accumulated on scan electrode SC1
- a negative wall voltage is accumulated on sustain electrode SU1
- a negative wall voltage is also accumulated on data electrode Dk.
- an address operation is performed in which an address discharge is generated in the discharge cells to be lit in the first row and the wall voltage is accumulated on each electrode.
- the voltage at the intersection of the data electrodes D1 to Dm to which the address pulse is not applied and the scan electrode SC1 does not exceed the discharge start voltage, so the address discharge does not occur.
- a scan pulse is applied to the scan electrode SC2 in the second row, and an address pulse is applied to the data electrode Dk corresponding to the discharge cell to emit light in the second row. Then, an address discharge occurs in the discharge cells in the second row to which the scan pulse and the address pulse are simultaneously applied, and an address operation is performed.
- the second display electrode pair group is in an idle period of SF1, and the voltage Vi1 is applied to the scan electrodes SC1081 to SC2160 belonging to the second display electrode pair group, and the sustain electrodes SU1081 to SU2160 are applied to the sustain electrodes SU1081 to SU2160.
- the scan electrodes SC1081 to SC2160 are held as high as possible within a range where no discharge occurs, so that the wall charge can be suppressed from decreasing, and a stable address operation can be performed in the subsequent address period. Can do.
- the voltage applied to each electrode belonging to the second display electrode pair group is not limited to the above, and another voltage in a range where no discharge is generated may be applied.
- the positive constant voltage Ve2 is continuously applied to the sustain electrodes SU1081 to SU2160 in the same manner as the address for the first display electrode pair group. Then, a scan pulse is applied to scan electrode SC1081, and an address pulse is applied to data electrode Dk corresponding to the discharge cell to emit light.
- the above address operation is repeated until reaching the discharge cell in the 2160th row, and an address discharge is selectively generated in the discharge cells to be lit to form wall charges.
- Maintenance period of SF1 During this time, the sustain period of SF1 is applied to the first display electrode pair group, and “60” sustain pulses are alternately applied to scan electrodes SC1 to SC1080 and sustain electrodes SU1 to SU1080 belonging to the first display electrode pair group. This is applied to cause the discharge cell that has performed the address discharge to emit light.
- the sustain pulses applied alternately to the display electrode pairs are sustain pulses having a timing at which the scan electrodes SC1 to SC1080 and the sustain electrodes SU1 to SU1080 are simultaneously at a high potential. That is, when positive voltage Vs is applied to scan electrodes SC1 to SC1080 and voltage 0 (V) is applied to sustain electrodes SU1 to SU1080, the voltage of scan electrodes SC1 to SC1080 is first changed from voltage 0 (V) to voltage. The voltage is increased toward Vs, and then the voltage of sustain electrodes SU1 to SU1080 is decreased from voltage Vs toward voltage 0 (V).
- the sustain pulse so that the scan electrodes SC1 to SC1080 and the sustain electrodes SU1 to SU1080 have a high potential at the same time, the scan electrodes can be stabilized without being affected by the write pulse applied to the data electrodes.
- the sustained discharge can be continued. The reason will be described below.
- the display electrode pair can be applied even if the write pulse is applied to the data electrode. There is no risk of a prior discharge occurring between one of the electrodes and the data electrode. Therefore, the sustain discharge can be stably continued regardless of the presence or absence of the address pulse.
- Erasure period suspension period: After the sustain period, two erase periods and a rest period are provided.
- a ramp waveform voltage rising toward the voltage Vr is applied to the scan electrodes SC1 to SC1080, and the positive wall voltage on the data electrode Dk is left, and the walls on the scan electrode SCi and the sustain electrode SUi.
- the voltage is being erased.
- the erasing period is not only for erasing the wall voltage but also for adjusting the wall voltage on the data electrode in preparation for the writing operation in the next writing period, so it is desirable to fix the voltage of the data electrode. Therefore, in the drive voltage waveform in the present embodiment, the write operation of the second display electrode pair group is stopped in the erase period of the first display electrode pair group.
- the first display electrode pair group is in the second half of the erase period, and after applying a constant voltage Ve1 to the sustain electrodes SU1 to SU1080, a ramp waveform voltage that decreases toward the voltage Vi4 is applied to the scan electrodes SC1 to SC1080.
- the wall voltage on the data electrode is adjusted in preparation for an address operation in the next address period.
- the address period starts immediately and the address operation is started from scan electrode SC1.
- the constant voltage Ve2 is continuously applied to the sustain electrodes SU1 to SU1080. Then, scan pulses are sequentially applied to scan electrodes SC1 to SC1080 in the same manner as the address period of SF1, and an address pulse is applied to data electrode Dk to perform an address operation in the discharge cells in the first to 1080th rows.
- the second display electrode pair group is in the sustain period of SF1. That is, sustain pulses of “60” are alternately applied to scan electrodes SC1081 to SC2160 and sustain electrodes SU1081 to SU2160 to cause the discharge cells that have performed address discharge to emit light. Then, after the sustain period, there are an erasure period and a suspension period.
- the SF2 address period for the second display electrode pair group the SF3 address period for the first display electrode pair group,..., The SF10 address period for the second display electrode pair group, and so on.
- one field ends after the sustain period and erase period of SF10 for the second display electrode pair group.
- the timing of the scan pulse and the address pulse is set so that the address operation is continuously performed in any one of the display electrode pair groups after the initialization period.
- ten subfields can be set within one field period.
- the number of subfields is the maximum number that can be set within one field period in the present embodiment.
- the driving time can be shortened by arranging the subfield having the smallest luminance weight in the last subfield.
- the voltage Vi1 is 150 (V), the voltage Vi2 is 400 (V), the voltage Vi3 is 200 (V), the voltage Vi4 is ⁇ 150 (V), and the voltage Vc is ⁇ 10 (V).
- the voltage Vb is 150 (V), the voltage Va is -160 (V), the voltage Vs is 200 (V), the voltage Vr is 200 (V), the voltage Ve1 is 140 (V), the voltage Ve2 is 150 (V), the voltage Vd is 60 (V).
- the gradient of the upward ramp waveform voltage applied to scan electrodes SC1 to SC2160 is 10 (V / ⁇ s), and the gradient of the downward ramp waveform voltage is ⁇ 2 (V / ⁇ s).
- these voltage values and gradients are not limited to the values described above, and are desirably set optimally based on the discharge characteristics of the panel and the specifications of the plasma display device.
- FIG. 13 is a circuit block diagram of the plasma display device 40.
- the plasma display device 40 includes a PDP 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, and a power supply circuit that supplies power necessary for each circuit block ( (Not shown).
- the image signal processing circuit 41 converts the image signal into image data indicating light emission / non-light emission for each subfield.
- the data electrode drive circuit 42 includes m switches for applying a voltage Vd or a voltage 0 (V) to each of the m data electrodes D1 to Dm.
- the image data output from the image signal processing circuit 41 is converted into address pulses corresponding to the data electrodes D1 to Dm and applied to the data electrodes D1 to Dm.
- the timing generation circuit 45 generates various timing signals for controlling the operation of each circuit based on the horizontal synchronization signal and the vertical synchronization signal, and supplies them to each circuit.
- Scan electrode driving circuit 43 drives scan electrodes SC1 to SC1080 belonging to the first display electrode pair group and scan electrodes SC1081 to SC2160 belonging to the second display electrode pair group based on the timing signal.
- sustain electrode drive circuit 44 drives sustain electrodes SU1 to SU1080 belonging to the first display electrode pair group and sustain electrodes SU1081 to SU2160 belonging to the second display electrode pair group based on the timing signal.
- FIG. 14 is a circuit diagram of the scan electrode driving circuit 43 in the plasma display device 40.
- Scan electrode driving circuit 43 includes scan electrode side sustain pulse generating circuit 50 (hereinafter simply referred to as “sustain pulse generating circuit 50”), ramp waveform generating circuit 60, scan pulse generating circuit 70a, scan pulse generating circuit 70b, scanning An electrode side switch circuit 75a (hereinafter simply referred to as “switch circuit 75a”) and a scan electrode side switch circuit 75b (hereinafter simply referred to as “switch circuit 75b”) are provided.
- Sustain pulse generation circuit 50 includes power recovery unit 51 and voltage clamp unit 55, and scan electrodes SC1 to SC1080 belonging to the first display electrode pair group or scan electrodes SC1081 to SC2160 belonging to the second display electrode pair group. A sustain pulse to be applied to is generated.
- the power recovery unit 51 includes a power recovery capacitor C51, switching elements Q51 and Q52, backflow prevention diodes D51 and D52, and resonance inductors L51 and L52.
- the interelectrode capacitance between the display electrode pair and the inductor L51 Alternatively, the sustain pulse rises and falls by causing LC resonance with the inductor L52.
- the sustain pulse rises the charge stored in the power recovery capacitor C51 is transferred to the interelectrode capacitance via the switching element Q51, the diode D51, and the inductor L51.
- the sustain pulse falls, the charge stored in the interelectrode capacitance is returned to the power recovery capacitor C51 via the inductor L52, the diode D52, and the switching element Q52.
- the power recovery capacitor C51 has a sufficiently large capacity compared to the interelectrode capacity, and is charged to about Vs / 2, which is half the voltage Vs, so as to serve as a power source for the power recovery unit 51.
- the voltage clamp part 55 has switching elements Q55 and Q56. Then, by turning on switching element Q55, the output voltage of sustain pulse generating circuit 50 (the voltage at node C in FIG. 14) is clamped to voltage Vs. Further, by turning on switching element Q56, the output voltage of sustain pulse generating circuit 50 is clamped to voltage 0 (V). Therefore, the impedance at the time of voltage application by the voltage clamp part 55 is small, and a large discharge current due to the sustain discharge can be flowed stably.
- sustain pulse generating circuit 50 generates sustain pulses by controlling switching elements Q51, Q52, Q55, and Q56.
- these switching elements can be configured using generally known elements such as MOSFETs and IGBTs, but the circuit configuration shown in FIG. 14 is a circuit configuration in the case where IGBTs are used as switching elements.
- IGBT IGBT
- a diode D55 is connected in parallel to the switching element Q55.
- the diode D56 is connected in parallel with the switching element Q56.
- a diode may be connected in parallel to each of the switching element Q51 and the switching element Q52 in order to protect the IGBT.
- the switching element Q59 is a separation switch, and when the voltage at the node C rises above Vs like Vi2 during the initialization period, the current flows from the ramp waveform generation circuit 60 described later to the voltage Vs via the diode D55. Prevent backflow.
- the gradient waveform generating circuit 60 includes two Miller integrating circuits 61 and 62.
- Miller integrating circuit 61 gently increases the output voltage of ramp waveform generating circuit 60 (the voltage at node C in FIG. 13) toward voltage Vt.
- Miller integrating circuit 62 gradually increases the output voltage of ramp waveform generating circuit 60 toward voltage Vr.
- Scan pulse generation circuit 70a includes power supply E71a of voltage Vp, Miller integration circuit 71a, switching elements Q71H1 to Q71H1080, and switching elements Q71L1 to Q71L1080.
- Miller integrating circuit 71a gently lowers the voltage on the low voltage side of power supply E71a (the voltage at node A in FIG. 14) toward voltage Va. Further, the voltage on the low voltage side of the power supply E71a is clamped to the voltage Va.
- Each of switching elements Q71L1 to Q71L1080 applies a low-voltage side voltage of power supply E71a to the corresponding scan electrode, and each of switching elements Q71H1 to Q71H1080 applies a high-voltage side voltage of power supply E71a to the corresponding scan electrode.
- Scan pulse generation circuit 70b has the same configuration as scan pulse generation circuit 70a, and includes power supply E71b of voltage Vp, Miller integration circuit 71b, switching elements Q71H1081 to Q71H2160, and switching elements Q71L1081 to Q71L2160. Then, the high voltage side voltage or the low voltage side voltage of the power supply E71b is applied to each of the scan electrodes SC1081 to SC2160 belonging to the second display electrode pair group.
- Switch circuit 75a has switching element Q76a, and electrically connects or disconnects sustain pulse generation circuit 50, ramp waveform generation circuit 60 and scan pulse generation circuit 70a.
- Switch circuit 75b has switching element Q76b, and electrically connects or disconnects sustain pulse generating circuit 50, ramp waveform generating circuit 60, and scan pulse generating circuit 70b.
- the drive waveforms shown in FIG. 12 are applied to the scan electrodes SC1 to SC1080 as the first display electrode pair group and the scan electrodes SC1081 to SC2160 as the second display electrode pair group. Can be applied.
- the switching elements Q76a and Q76b of the switch circuits 75a and 75b are turned on, the switching elements Q71H1 to Q71H2160 of the scan pulse generation circuits 70a and 70b are turned on, and the Q71L1 to Q71L2160 are turned off, thereby generating a ramp waveform.
- a voltage obtained by adding the voltage Vp to the output from the circuit 60 is applied simultaneously to the scan electrodes SC1 to SC2160.
- the switching elements Q76a and Q76b of the switch circuits 75a and 75b are turned off, the switching elements Q71H1 to Q71H2160 of the scan pulse generation circuits 70a and 70b are turned off, and the Q71L1 to Q71L2160 are turned on, and then the Miller integrating circuits 71a and 71b are turned on.
- a downward ramp voltage up to voltage Vi4 is applied simultaneously to scan electrodes SC1 to SC2160.
- Q71L1 to Q71L2160 are turned off and switching elements Q71H1 to Q71H2160 are turned on to apply voltage Vc to scan electrodes SC1 to SC2160 all at once.
- the switching elements Q71Hn and Q71Ln are turned on / off while the switching element Q76a of the switch circuit 75a is turned off and the Miller integrating circuit 71a is turned on.
- a scan pulse is applied to.
- the scan pulse is applied to the corresponding scan electrode SCn in the same manner.
- the switching element Q76a of the switch circuit 75a is turned on, the switching elements Q71H1 to Q71H1080 of the scan pulse generation circuit 70a are turned off, and the switching elements Q71L1 to Q71L1080 are turned on.
- the output of the generation circuit 50 is applied to the first display electrode pair groups SC1 to SC1080.
- the switching element Q76b of the switch circuit 75b is turned off, and the output of the sustain pulse generating circuit 50 is the scan electrode SC1081 belonging to the second display electrode pair group. No effect on SC2160.
- the above-described address operation can be performed on scan electrodes SC1081 to SC2160 belonging to the second display electrode pair group without depending on the output of sustain pulse generating circuit 50.
- the switching element Q76a of the switch circuit 75a is turned off. There is no effect on scan electrodes SC1 to SC1080 belonging to one display electrode pair group.
- the switching element Q76a of the switch circuit 75a is turned on, the switching elements Q71H1 to Q71H1080 of the scan pulse generation circuit 70a are turned off, and the switching elements Q71L1 to Q71L1080 are turned on.
- the output from the ramp waveform generating circuit 60 is applied to the scan electrodes SC1 to SC1080.
- the second display electrode pair group is in an address period (more precisely, an address operation is interrupted), and the switching element Q76b of the switch circuit 75b is turned off.
- the voltage has no effect on the scan electrodes SC1081 to SC2160 belonging to the second display electrode pair group.
- the subsequent idle period and the latter erasing period Since the switching element Q76b is turned off, the output voltage of the ramp waveform generation circuit 60 is not applied to the scan electrodes SC1081 to SC2160 belonging to the second display electrode pair group. It does not affect.
- the switch circuits 75a and 75b are turned off in the period in which the downward ramp voltage is applied and the address period, whereby one display electrode pair group is compared with the other display electrode pair group.
- a desired voltage can be applied without being affected by the applied voltage.
- FIG. 15 is a circuit diagram of the sustain electrode drive circuit 44 in the plasma display device 40.
- Sustain electrode drive circuit 44 includes sustain electrode side sustain pulse generation circuit 80 (hereinafter simply referred to as “sustain pulse generation circuit 80”), constant voltage generation circuit 90a, constant voltage generation circuit 90b, and sustain electrode side switch circuit 100a ( The storage electrode side switch circuit 100b (hereinafter simply referred to as “switch circuit 100b”) is provided.
- Sustain pulse generation circuit 80 includes power recovery unit 81 and voltage clamp unit 85, and sustain electrodes SU1 to SU1080 belonging to the first display electrode pair group or sustain electrodes SU1081 to SU2160 belonging to the second display electrode pair group. A sustain pulse to be applied to is generated.
- the power recovery unit 81 includes a power recovery capacitor C81, switching elements Q81 and Q82, backflow prevention diodes D81 and D82, and resonance inductors L81 and L82. Similarly to the power recovery unit 51, the display electrode The interelectrode capacitance and the inductor L81 or the inductor L82 are LC-resonated to rise and fall the sustain pulse.
- the voltage clamp unit 85 includes switching elements Q85 and Q86, and similarly to the voltage clamp unit 55, the output voltage of the sustain pulse generation circuit 80 (the voltage at the node D in FIG. 14) is set to the voltage Vs or the voltage 0 (V). Clamp to
- the constant voltage generation circuit 90a includes switching elements Q91a, Q92a, Q93a, and Q94a.
- Switching element Q93a and switching element Q94a form a bidirectional switch connected in series so that the directions of currents to be controlled are opposite to each other.
- a constant voltage Ve1 is applied to sustain electrodes SU1 to SU1080 belonging to the first display electrode pair group via switching elements Q91a, Q93a, and Q94a, and constant voltages are applied to sustain electrodes SU1 to SU1080 via switching elements Q92a, Q93a, and Q94a.
- a voltage Ve2 is applied.
- the constant voltage generation circuit 90b has the same configuration as the constant voltage generation circuit 90a, and includes switching elements Q91b, Q92b, Q93b, and Q94b. Then, the constant voltage Ve1 or the constant voltage Ve2 is applied to the sustain electrodes SU1081 to SU2160 belonging to the second display electrode pair group.
- FIG. 15 shows a circuit configuration using MOSFETs and IGBTs. That is, IGBTs are used for the switching elements Q94a and Q94b, and a diode D94a is connected in parallel to the switching element Q94a in order to secure a current path in a direction opposite to the direction of the current to be controlled, and in parallel to the switching element Q94b. A diode D94b is connected.
- Switching element Q94a is provided to allow current to flow from sustain electrodes SU1 to SU1080 toward the power sources of voltages Ve1 and Ve2. However, switching element Q94a supplies current only from the power sources of voltages Ve1 and Ve2 to sustain electrodes SU1 to SU1080. When flowing, switching element Q94a may be omitted. The same applies to switching element Q94b.
- a capacitor C93a is connected between the gate and drain of the switching element Q93a
- a capacitor C93b is connected between the gate and drain of the switching element Q93b.
- These capacitors C93a and C93b are provided in order to moderate the rise when the voltages Ve1 and Ve2 are applied, but are not necessarily required. In particular, when the voltage Ve1 and the voltage Ve2 are changed stepwise, these capacitors C93a and C93b are unnecessary.
- the switch circuit 100a includes switching elements Q101a and Q102a, and the switching element Q101a and the switching element Q102a form a bidirectional switch connected in series so that the directions of currents to be controlled are opposite to each other. Then, sustain pulse generating circuit 80 and sustain electrodes SU1 to SU1080 belonging to the first display electrode pair group are electrically connected or separated.
- the switch circuit 100b has switching elements Q101b and Q102b, and the switching elements Q101b and Q102b also form a bidirectional switch connected in series so that the directions of currents to be controlled are opposite to each other. Then, sustain pulse generating circuit 80 and sustain electrodes SU1081 to SU2160 belonging to the second display electrode pair group are electrically connected or separated.
- the sustain electrode drive circuit 44 By using the sustain electrode drive circuit 44, the drive waveforms shown in FIG. 12 are applied to the sustain electrodes SU1 to SU1080 as the first display electrode pair group and the scan electrodes SU1081 to SU2160 as the second display electrode pair group. Can be applied.
- the switching elements Q101a, Q101b, Q102a, and Q102b of the switch circuits 100a and 100b are turned on and the output of the sustain pulse generating circuit 80 is set to 0 (V) during the period in which the upward ramp waveform is applied to the scan electrodes SC1 to SC2160. ), 0 (V) is applied simultaneously to the sustain electrodes SU1 to SU2160.
- 0 (V) is applied simultaneously to the sustain electrodes SU1 to SU2160.
- switching elements Q101a, Q101b, Q102a, Q102b of switch circuits 100a, 100b are turned off, and constant voltage generation circuits 90a, 90b are turned off.
- voltage Ve1 is applied to sustain electrodes SU1 to SU2160 all at once.
- the voltage Ve2 is output by turning off the switching elements Q91a and Q91b and turning on Q92a and Q92b.
- the switching elements Q101a and Q102a of the switch circuit 100a are turned on, the switching elements Q93a and Q94a of the constant voltage generation circuit 90a are turned off, and the sustain pulse generation circuit 80 outputs A pulse is applied to sustain electrodes SU1 to SU1080.
- the second display electrode pair group is in an address period, but the switching elements Q101b and Q102b of the switch circuit 100b are turned off, so that the voltage output from the sustain pulse generating circuit 80 does not affect the sustain electrodes SU1081 to SU2160. do not do.
- the second display electrode pair group is the sustain period and the first display electrode pair group is the address period.
- switching elements Q101b and Q102b of switch circuit 100b are turned on, switching elements Q93b and Q94b of constant voltage generation circuit 90b are turned off, and a sustain pulse output from sustain pulse generation circuit 80 is applied to sustain electrodes SU1081 to SU2160.
- the first display electrode pair group is in the address period, but since the switching elements Q101a and Q102a of the switch circuit 100a are turned off, the voltage output from the sustain pulse generating circuit 80 does not affect the sustain electrodes SU1 to SU1080. do not do.
- the sustain electrodes SU1 to SU1080 belonging to the subsequent first display electrode pair group output the potential 0 (V) from the sustain pulse generating circuit 80 during the erasing period, and during the rest period, the switching elements Q101a, By turning off Q102a and turning on switching elements Q91a, Q93a, Q94a of constant voltage generating circuit 90a, voltage Ve1 is applied to sustain electrodes SU1-SU1080. In the subsequent erasing period, voltage Ve2 is applied to sustain electrodes SU1 to SU1080 by turning off switching element Q91a of constant voltage generation circuit 90a and turning on Q92a.
- the sustain electrodes SU1081 to SU2160 belonging to the second display electrode pair group are not affected even in the first erase period, the rest period, and the second erase period. Similarly, when the sustain electrodes SU1081 to SU2160 belonging to the second display electrode pair group are in the erasing period and the rest period, and the sustain electrodes SU1 to SU1080 belonging to the first display electrode pair group are in the address period, the sustain electrode SU1081 is similarly applied. The voltage applied to SU2160 has no effect on sustain electrodes SU1 to SU1080.
- the sustain electrode drive circuit 44 is not affected by the applied voltage of the other display electrode pair group with respect to one display electrode pair group, because the switch circuits 100a and 100b are turned off in the address period. A desired voltage can be applied.
- the PDP 10 is high-definition and the cell pitch is narrow.
- the composition and partial pressure of the discharge gas are set, and Can display light with high efficiency.
- the time required for writing in each subfield becomes longer. Therefore, as in the first embodiment, after writing in all the discharge cells in each subfield, all the discharge cells are maintained at the same time.
- a driving method for discharging it is difficult to secure a sufficient discharge sustaining period.
- the discharge delay discharge statistical delay time ts, discharge formation delay time tf
- the writing period tends to increase. Therefore, it is difficult to ensure a long discharge maintenance time, and it becomes difficult to obtain the light emission luminance.
- the discharge maintaining period that can be secured in one field can be further extended, and the emission luminance can be obtained.
- the disadvantage that the emission luminance is likely to decrease in the high-definition PDP can be compensated by the luminance improvement effect by the driving method.
- the display device can be realized.
- the subfield configuration in which the subfield phases of the first display electrode pair group and the second display electrode pair group are shifted in all subfields has been described as an example.
- the subfield configuration is not limited to such a subfield configuration.
- a subfield configuration including several subfields of an address / sustain separation system in which the phases of the sustain periods are aligned with respect to all discharge cells may be used.
- circuit configurations such as the sustain pulse generation circuit and the ramp waveform generation circuit are merely examples, and other circuit configurations may be used as long as similar drive voltage waveforms can be generated.
- the power recovery unit 51 shown in FIG. 14 moves the charge of the capacitor C51 to the interelectrode capacitance via the switching element Q51, the diode D51, the inductor L51, and the switching element Q59 when the sustain pulse rises, and the sustain pulse falls
- the circuit configuration returns the inter-electrode capacitance to the capacitor C51 via the inductor L52, the diode D52 and the switching element Q52, but the connection of one terminal of the inductor L51 is changed from the source of the switching element Q59 to the node C.
- a circuit configuration may be employed in which the charge of the capacitor C51 is moved to the interelectrode capacitance via the switching element Q51, the diode D51, and the inductor L51 when the sustain pulse rises. Further, a circuit configuration in which the inductor L51 and the inductor L52 are shared by one inductor may be employed.
- the ramp waveform generation circuit 60 shown in FIG. 14 has a circuit configuration including two Miller integration circuits 61 and 62, and has a circuit configuration including one voltage switching circuit and one Miller integration circuit. Also good.
- the capacitor C51 of the power recovery unit 51 shown in FIG. 14 is deleted, all of the power recovery unit 81 shown in FIG. 15 is deleted, and the connection point between the node D of FIG. 15 and the switching elements Q51 and Q52 of FIG. It is also possible to have a circuit configuration in which and are connected. Alternatively, all of the power recovery unit 51 shown in FIG. 14 is deleted, the capacitor C81 of the power recovery unit 81 shown in FIG. 15 is deleted, and the connection point and the node C of the switching elements Q81 and Q82 of FIG. A circuit configuration may be adopted.
- FIG. 10 illustrates an example in which there are 2160 display electrode pairs and two display electrode pair groups.
- the PDP 101 shown in FIG. 16 there are 4320 display electrode pairs and data electrodes D1 to Dm. Intersects scan electrodes SC1 to SC2160 and sustain electrodes SU1 to SU2160, and another data electrode Dm + 1 to D2m intersects scan electrodes SC2161 to SC4320 and sustain electrodes SU2161 to SU4320.
- This PDP can also be operated in the same manner as described above by using dual scanning together.
- 4320 display electrode pairs arranged in the PDP 101 are divided into an upper half and a lower half.
- scan electrodes SC1 to SC1080 and sustain electrodes SU1 to SU1080 form a first display electrode pair group
- scan electrodes SC1081 to SC2160 and sustain electrodes SU1081 to SU2160 form a second display electrode pair group.
- the data electrodes D1 to Dm are crossed with the first and second display electrode pair groups.
- scan electrodes SC2161 to SC3240 and sustain electrodes SU2161 to SU3240 form a first display electrode pair group
- scan electrodes SC3241 to SC4320 and sustain electrodes SU3241 to SU4320 form a second display electrode pair group.
- the data electrodes Dm + 1 to D2m are crossed with the first and second display electrode pair groups.
- the scan electrodes SC2161 to SC4320 and the sustain electrodes SU2161 to SU4320 perform any operation. There is no influence even if it goes.
- the data electrodes Dm + 1 to D2m intersect only the lower display electrode pair group, they are not affected by the upper scan electrodes SC1 to SC2160 and the sustain electrodes SU1 to SU2160.
- the number of display electrode pairs is twice that shown in FIG. 10, but since the independent operation can be performed in each of the upper and lower regions, the operation described above is possible. Similar operations can be performed in parallel.
- FIG. 17 is a circuit diagram of scan electrode drive circuit 431 for driving the scan electrodes of the panel shown in FIG.
- the difference from scan electrode drive circuit 43 shown in FIG. 14 is that switching elements Q71H2161 to Q71H3240 and Q71L2161 for driving scan electrodes SC2161 to SC3240 in scan pulse generation circuit 70e are different from scan pulse generation circuit 70a.
- switching elements Q71H3241 to Q71H4320 and Q71L3241 to Q71L4320 for driving scan electrodes SC3241 to SC4320 are added to scan pulse generating circuit 70f as compared to scan pulse generating circuit 70b. It is a point.
- the scan pulse generation circuit 50 and the ramp waveform generation circuit 60 are the same.
- an address pulse can be applied to SC 2161 simultaneously with an address pulse applied to scan electrode SC1 in the address period of the first display electrode pair group.
- the sustain electrode drive circuit may be configured similarly. That is, if sustain electrodes SU2161 to SU3240 are additionally connected to sustain electrode drive circuits connected to sustain electrodes SU1 to SU1080, and sustain electrodes SU3241 to SU4320 are additionally connected to circuits connected to sustain electrodes SU1081 to SU2160. Good.
- FIG. 18 is an electrode array diagram of the PDP 102.
- the number of display electrode pairs is 4320 pairs, which are divided into four display electrode pair groups.
- the number m of data electrodes is arranged so as to intersect all the display electrode pairs.
- the number of sustain pulses applied to the display electrode pair during the sustain period can be increased, and the light emission luminance of the panel can be increased.
- FIG. 19 is a circuit diagram of the scan electrode drive circuit 432 that drives the PDP 102. Since the PDP 102 has four display electrode pair groups, the scan electrode drive circuit 432 includes switch circuits 75a, 75b, 75c, and 75d, and includes scan pulse generation circuits 70a, 70b, 70c, and 70d.
- Scan pulse generation circuit 70a is connected to scan electrodes SC1 to SC1080 belonging to the first display electrode pair group, and scan pulse generation circuit 70b is connected to scan electrodes SC1081 to SC2160 belonging to the second display electrode pair group.
- the pulse generation circuit 70c is connected to the scan electrodes SC2161 to SC3240 belonging to the third display electrode pair group, and the scan pulse generation circuit 70d is connected to the scan electrodes SC3241 to SC4320 belonging to the fourth display electrode pair group.
- the operation is performed by shifting the sustain period for each display electrode pair group. That is, for each of the four display electrode pair groups, writing is performed on the scan electrodes belonging to the group, and a sustain period for applying a sustain pulse is set immediately after the write period.
- FIG. 20 is a circuit diagram of the sustain electrode drive circuit 442 for driving the panel shown in FIG.
- the sustain electrode driving circuit 442 includes four switch circuits 100a, 100b, 100c, and 100d, and constant voltage generation circuits 90a, 90b, 90c, and 90d.
- the constant voltage generation circuit 90a is connected to the sustain electrodes SU1 to SU1080 belonging to the first display electrode pair group, and performs the same operation as described above.
- the constant voltage generation circuit 90b is connected to the sustain electrodes SU1081 to SU2160 belonging to the second display electrode pair group, and the constant voltage generation circuit 90c is connected to the sustain electrodes SC2161 to SU3240 belonging to the third display electrode pair group.
- the generation circuit 90d is connected to the sustain electrodes SU3241 to SU4320 belonging to the fourth display electrode pair group, and these also perform the same operation as described above.
- switch circuits 75a to 75n and scan pulse generating circuits 70a to 70n are added to the circuit shown in FIG.
- the circuits 100a to 100n and the constant voltage generation circuits 90a to 90n it is possible to drive the display electrode pairs belonging to all the display electrode pair groups.
- the present invention may be applied to a PDP having a resolution of SD, HD, or FHD. Well, the same effect can be obtained.
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Abstract
Description
Xe*+Xe+Xe→Xe2 *+Xe …(式1)
によって形成されるため、キセノン分圧が高くなるほど形成確率は急速に高くなる。また基底状態が反発ポテンシャルを持つので、速やかに単原子に解離するため自己吸収がおこらず、高ガス圧でも高い発光効率が得られる。
(PDPの構成)
図1は、実施の形態1にかかるAC型PDP100の構造を示す模式図である。
上記PDP100を駆動する方式は、1フィールドが、複数のサブフィールドから構成され、各サブフィールドにおいて、走査電極Scnとデータ電極7とに電圧を印加して書き込みを行い、パネル全体の放電セルに書き込みを行った後、すべての維持電極Susと走査電極Scnとの間に所定の交流矩形波パルス電圧を印加する方式である。
図2は、図1に示すPDP100を横方向に切断した断面を示す図であって、1セル相当を示している。
AC型PDPでは放電セル11が画面の1画素(正確にはそのうちの1色を表示)に相当するため、放電発光体としては非常に微小である。このため放電を惹起する電極(維持電極Susと走査電極Scn)の間隔が非常に狭く、よく知られた放電の電極間距離とガス圧の積と放電開始電圧との関係(Paschenの法則)から、放電電圧を低く抑えるにはガス圧が高くならざるを得ず、一般に102kPaのオーダーとなる。こうした圧力域では、キセノンの励起原子は他の原子との三体衝突過程
Xe*+Xe+M → Xe2 *+M …(式2)
によってエキシマとなる可能性が高い。ここでMは同じキセノンの基底状態の原子や、あるいは放電中にふくまれる他のガス、例えばネオンやアルゴンの基底状態の原子である。
以下、実験結果に基づいてその内容を説明する。
放電ガスとして、キセノン+ネオン系の混合ガスに対して、ヘリウムを添加した混合ガスを準備する。ここで、各放電ガス成分において、キセノンの分圧比は20%一定とし、He分圧比は0~50%の範囲で変化させる。
キセノン+ネオン系放電ガスにヘリウムを添加することによって発光効率に与える効果が、放電空間幅によって異なることを確認するために、新たに、セルピッチ150μm(放電空間幅D=120μm)およびセルピッチ120μm(放電空間幅D=100μm)の試験パネルを試作し、上記の実験1と同様の実験を行った。なお、放電セルの深さはいずれも100μm程度である。
セルサイズが小さく放電空間幅が狭いPDPでは、上記のようにキセノン+ネオン系の放電ガスにヘリウムを添加することで発光効率が上昇するが、その理由について以下に考察する。
Xe + e → Xe+ + 2e …(式3)
で表される反応である。またキセノン原子の最もエネルギーの低い励起準位群(第一励起準位)は、共鳴線といわれる147nmの紫外光子を放射したり、またエキシマとなって172nmを中心とした高効率の発光をするため、とりわけ重要である。これは直接(衝突)励起過程
Xe + e → Xe*+ e …(式4)
によって励起される。ところでキセノン原子は電離エネルギーが12.13eV、また第一励起準位の励起エネルギーが約8.4eVと、たとえば一般照明用蛍光ランプでよく使用される水銀(電離エネルギー10.38eV)と比べて高い。したがって効率よくプラズマを維持するためにはエネルギーの高い電子群が必要である。
以上の過程において、PDPの効率を高める上でのポイントとして、以下のことが重要と考えられる。
上記実験は、キセノンの分圧比を20%として行ったが、キセノンの分圧比を15%から25%の程度の範囲内で変えて実験した場合も、特性に大きな変化をきたすことはなく、同様の結果が得られた。
放電ガスにおいて、キセノン、ネオン、ヘリウム以外の成分が不純物程度のレベル(概ね10ppm以下)で含有してもよいが、これ以上のレベルで他のガス成分が混入することは、放電電圧の上昇や発光効率の低下につながるので好ましくない。
本実施形態では、PDPの構造は、実施の形態1で説明したPDPと同様であるが、PDPを駆動する方式がピュアウェ-ブ駆動方式である。
本実施の形態においては、Tw=1512μs、Ts=600μsであるので、1512/(1512-600)=1.66となる。従って、表示電極対グループの数N=2となる。
次に、駆動電圧波形の詳細とPDPの動作について説明する。
初期化期間では、データ電極D1~Dm、維持電極SU1~SU2160にそれぞれ電圧0(V)を印加し、走査電極SC1~SC2160には電圧Vi1から電圧Vi2に向かって緩やかに上昇する傾斜波形電圧を印加する。この傾斜波形電圧が上昇する間に、走査電極SC1~SC2160と維持電極SU1~SU2160、データ電極D1~Dmとの間でそれぞれ微弱な初期化放電が発生する。そして、走査電極SC1~SC2160上に負の壁電圧が蓄積されるとともに、データ電極D1~Dm上および維持電極SU1~SU2160上には正の壁電圧が蓄積される。ここで、電極上の壁電圧とは電極を覆う誘電体層上、保護層上、蛍光体層上等に蓄積された壁電荷により生じる電圧を表す。なお、この期間にデータ電極D1~Dmに正の電圧Vdを印加してもよい。
第1の表示電極対グループに対するSF1の書込み期間について説明する。
この間、第1の表示電極対グループに対してはSF1の維持期間であり、第1の表示電極対グループに属する走査電極SC1~SC1080および維持電極SU1~SU1080に「60」の維持パルスを交互に印加して、書込み放電を行った放電セルを発光させる。
維持期間の後には2つの消去期間と休止期間が設けられている。前半の消去期間では、走査電極SC1~SC1080に電圧Vrに向かって上昇する傾斜波形電圧を印加し、データ電極Dk上の正の壁電圧を残したまま、走査電極SCiおよび維持電極SUi上の壁電圧を消去している。このように消去動作を行うためにはある程度の時間が必要である。そして消去期間は壁電圧を消去するだけでなく、次の書込み期間の書込み動作に備えてデータ電極上の壁電圧を調整する期間でもあるため、データ電極の電圧を固定しておくことが望ましい。そのため、本実施の形態における駆動電圧波形では、第1の表示電極対グループの消去期間において第2の表示電極対グループの書込み動作を停止している。
次に第1の表示電極対グループに対するSF2の書込み期間について説明する。
上記駆動波形を実現するプラズマディスプレイ装置の駆動回路の一例を説明する。
図14は、上記プラズマディスプレイ装置40における走査電極駆動回路43の回路図である。走査電極駆動回路43は、走査電極側維持パルス発生回路50(以下、単に「維持パルス発生回路50」と略称する)、傾斜波形発生回路60、走査パルス発生回路70a、走査パルス発生回路70b、走査電極側スイッチ回路75a(以下、単に「スイッチ回路75a」と略称する)、走査電極側スイッチ回路75b(以下、単に「スイッチ回路75b」と略称する)を備えている。
図15は、プラズマディスプレイ装置40における維持電極駆動回路44の回路図である。維持電極駆動回路44は、維持電極側維持パルス発生回路80(以下、単に「維持パルス発生回路80」と略称する)、一定電圧発生回路90a、一定電圧発生回路90b、維持電極側スイッチ回路100a(以下、単に「スイッチ回路100a」と略称する)、維持電極側スイッチ回路100b(以下、単に「スイッチ回路100b」と略称する)を備えている。
以上説明した本実施形態にかかる表示装置においては、PDP10が、高精細であって、そのセルピッチは狭いが、実施の形態1で説明したように、放電ガスの組成及び分圧が設定され、それによって高効率で発光表示することができる。
上記図11に示した駆動方法では、すべてのサブフィールドにおいて第1の表示電極対グループと第2の表示電極対グループとのサブフィールドの位相をずらしたサブフィールド構成を例に説明したが、このようなサブフィールド構成に限定されるものではなく、例えば、すべての放電セルに対して維持期間の位相を揃えた書込み・維持分離方式のサブフィールドをいくつか含むサブフィールド構成であってもよい。
上記図10においては表示電極対が2160対あって、表示電極対グループを2グループとした例を説明したが、図16に示すPDP101では、表示電極対が4320対存在し、データ電極D1~Dmが走査電極SC1~SC2160および維持電極SU1~SU2160と交差し、別のデータ電極Dm+1~D2mが走査電極SC2161~SC4320および維持電極SU2161~SU4320と交差している。このPDPにおいても、デュアルスキャンを併用して、上で説明したのと同様の方式で動作させることが可能である。
以上、表示電極対グループ数Nが2の場合について説明したが、表示電極対グループ数Nをもっと大きく設定することもできる。
上記実施の形態2においては、PDPに表示電極対が2160対以上設けられている場合について説明したが、このライン数以下の場合、いわゆる、SD、HD、FHDといった解像度のPDPに適用してもよく、同様の効果を得ることができる。
2 背面板
3 リブ
4 放電電極対
5 誘電体層
6 保護膜
7 データ電極
8 下地誘電体層
9 蛍光体層
11 放電セル
10 PDP
21 前面基板
24 表示電極対
25 誘電体層
26 保護層
31 背面基板
32 データ電極
33 誘電体層
34 隔壁
35 蛍光体層
100 PDP
Claims (3)
前記放電電極対の直下において前記リブで規定される前記放電空間の最小幅が、65μm以上100μm以下であり、
前記放電ガスは、
主成分がキセノンとネオンとヘリウムとからなり、
キセノンの分圧比が15%以上25%以下、ヘリウムの分圧比が20%以上50%以下であり、全圧が60kPa以上70kPa以下であるプラズマディスプレイパネル。
ヘリウムの分圧比は30%以上40%以下である請求項1記載のプラズマディスプレイパネル。
前記プラズマディスプレイパネルは、放電電極対を複数対備え、
前記駆動回路は、
前記複数の放電電極対を複数の表示電極対グループに分け、
前記表示電極対グループ毎に、放電セルで書込み放電を発生させる書込み期間と前記放電セルで維持放電を発生させる維持期間とを有する複数のサブフィールドを用いて1フィールド期間を分割し、
前記表示電極対グループの数をN(Nは2以上の整数)、パネル全体の放電セルで1回の書込み動作を行うために必要な時間をTwとするとき、
各表示電極対グループの各サブフィールドの維持期間の時間が、
Tw×(N-1)/N以下に設定された駆動を行う表示装置。
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JPH09244578A (ja) * | 1996-03-13 | 1997-09-19 | Fujitsu Ltd | プラズマ表示装置及びその駆動方法 |
JP2001265281A (ja) * | 2000-03-17 | 2001-09-28 | Matsushita Electric Ind Co Ltd | 表示装置およびその駆動方法 |
JP2003346660A (ja) * | 2002-05-27 | 2003-12-05 | Hitachi Ltd | プラズマディスプレイパネル及びそれを用いた画像表示装置 |
JP2007249227A (ja) * | 2007-05-14 | 2007-09-27 | Hitachi Ltd | プラズマディスプレイパネル及びそれを用いた画像表示装置 |
JP2007294360A (ja) * | 2006-04-27 | 2007-11-08 | Matsushita Electric Ind Co Ltd | プラズマディスプレイパネルおよびプラズマディスプレイパネル装置 |
JP2009277492A (ja) * | 2008-05-14 | 2009-11-26 | Panasonic Corp | プラズマディスプレイパネル |
Family Cites Families (3)
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---|---|---|---|---|
JP3384390B2 (ja) | 2000-01-12 | 2003-03-10 | ソニー株式会社 | 交流駆動型プラズマ表示装置 |
EP1280179A3 (en) * | 2001-07-23 | 2003-09-03 | Asahi Glass Company Ltd. | Flat display panel |
FR2845199A1 (fr) * | 2002-09-27 | 2004-04-02 | Thomson Plasma | Panneau de visualisation a plasma a electrodes coplanaires de largeur constante |
-
2011
- 2011-03-16 CN CN2011800047962A patent/CN102668011A/zh active Pending
- 2011-03-16 WO PCT/JP2011/001564 patent/WO2011151957A1/ja active Application Filing
- 2011-03-16 KR KR1020127012834A patent/KR20120076373A/ko not_active Application Discontinuation
- 2011-03-16 US US13/505,266 patent/US8305522B2/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09244578A (ja) * | 1996-03-13 | 1997-09-19 | Fujitsu Ltd | プラズマ表示装置及びその駆動方法 |
JP2001265281A (ja) * | 2000-03-17 | 2001-09-28 | Matsushita Electric Ind Co Ltd | 表示装置およびその駆動方法 |
JP2003346660A (ja) * | 2002-05-27 | 2003-12-05 | Hitachi Ltd | プラズマディスプレイパネル及びそれを用いた画像表示装置 |
JP2007294360A (ja) * | 2006-04-27 | 2007-11-08 | Matsushita Electric Ind Co Ltd | プラズマディスプレイパネルおよびプラズマディスプレイパネル装置 |
JP2007249227A (ja) * | 2007-05-14 | 2007-09-27 | Hitachi Ltd | プラズマディスプレイパネル及びそれを用いた画像表示装置 |
JP2009277492A (ja) * | 2008-05-14 | 2009-11-26 | Panasonic Corp | プラズマディスプレイパネル |
Also Published As
Publication number | Publication date |
---|---|
US8305522B2 (en) | 2012-11-06 |
CN102668011A (zh) | 2012-09-12 |
KR20120076373A (ko) | 2012-07-09 |
US20120212464A1 (en) | 2012-08-23 |
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