WO2007013139A1 - プラズマディスプレイ装置 - Google Patents
プラズマディスプレイ装置 Download PDFInfo
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- WO2007013139A1 WO2007013139A1 PCT/JP2005/013624 JP2005013624W WO2007013139A1 WO 2007013139 A1 WO2007013139 A1 WO 2007013139A1 JP 2005013624 W JP2005013624 W JP 2005013624W WO 2007013139 A1 WO2007013139 A1 WO 2007013139A1
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- electrode
- load factor
- plasma display
- display device
- display load
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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
- G09G3/298—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 using surface discharge panels
- G09G3/2983—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 using surface discharge panels using non-standard pixel electrode arrangements
- G09G3/2986—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 using surface discharge panels using non-standard pixel electrode arrangements with more than 3 electrodes involved in the operation
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
- G09G3/294—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge
- G09G3/2942—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge with special waveforms to increase luminous efficiency
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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
Definitions
- the present invention relates to the technology of a plasma display panel (abbreviated as PDP) and a display device, and in particular, first, second, and third electrodes (represented by symbols X, ⁇ , and Z, respectively) and A four-electrode structure PDP having a fourth electrode (denoted by symbol A) that serves as an address electrode that intersects the PDP, a method for driving and controlling the PDP, and a drive circuit (driver) etc. in the PDP.
- PDP plasma display panel
- a four-electrode structure PDP having a fourth electrode (denoted by symbol A) that serves as an address electrode that intersects the PDP, a method for driving and controlling the PDP, and a drive circuit (driver) etc.
- This is related to technologies such as plasma display devices that are configured with PDP modules and chassis.
- a PDP having a four-electrode structure has been proposed as a PDP realizing high luminous efficiency.
- a four-electrode PDP has a structure in which a Z electrode is provided between the X and Y electrodes on the first substrate in addition to the substantially parallel X and Y electrodes. Sustain discharge is performed using these electrodes.
- the Z electrode driving method and method include a method of applying a fixed potential (referred to as a first method and a fixed potential method) and a method of applying a narrow and wide pulse (abbreviated as a narrow pulse) (second method). And a narrow pulse system). These two methods are known techniques.
- the driver side force By applying a pulse with a suitable timing condition to the Z electrode of the PDP as a narrow pulse method, the driver side force also has a lower sustain discharge voltage (Vs) than that of the fixed potential method, that is, the electron temperature. Therefore, multi-stage sustain discharge can be generated so as to be low.
- Vs is a voltage used in sustain discharge driving for X, ⁇ , and Z. Therefore, even with the same long gap discharge between XY of the cell, it is possible to realize a discharge with higher luminous efficiency with less loss of the excitation energy of the narrow pulse method.
- Patent Document 1 The technique of PDP having a four-electrode structure is described in Patent Document 1, for example.
- Patent Document 1 Japanese Patent Laid-Open No. 2002-110047
- the narrow pulse method that is, when a sustain pulse is generated by applying a narrow pulse to the Z electrode
- Discharge energy efficiency that is, brightness and panel light emission efficiency are improved.
- reactive power increases according to the number of pulses (referred to as Z drive pulses) applied to the Z electrode.
- the number of sustain discharge drive pulses abbreviated as the sustain number
- the reactive power accounts for most of the power consumption of the sustain discharge system. Occupy.
- the increase in the number of sustains is due to a power control operation (described later).
- the reactive power is power consumed by the circuit itself other than discharge power (that is, power used for discharge itself) in the sustain discharge system.
- the present invention has been made in view of the above-described problems, and an object thereof is to solve the above-described problems and to drive a PDP having a four-electrode structure, particularly to a Z electrode in sustain discharge driving.
- driving it is intended to provide technology that can comprehensively improve PDP brightness and reduce power consumption.
- the present invention provides a first electrode and a second electrode (X, Y) disposed substantially in parallel in a first direction, a third electrode (Z) disposed between the XY, And a four-electrode PDP having a fourth electrode (A) which is arranged to cross the X, ⁇ and Z in the second direction and serves as an address electrode, and a drive circuit (driver) for driving the electrode group of the PDP
- a technology of a plasma display device including a circuit such as a control circuit (controller) for controlling the drive circuit, characterized by comprising the following technical means.
- This device has means for switching and using a plurality of types of sustain discharge drive waveforms having different characteristics in accordance with the display load factor during drive control for the circuit force PDP.
- Main package In the driving of the PDP electrode group from the controller and driver, in particular, when controlling the sustain discharge drive, the sustain discharge by the drive method (the second method) in which a narrow pulse is applied to the Z electrode at an appropriate timing.
- This measure is realized mainly by the sustain / discharge drive control for the electrode group of the PDP based on the judgment of the display load factor by the controller and driver, and the corresponding one-dore mounting configuration.
- the narrow pulse method for the Z electrode is selectively used based on the determination of the display load factor of the PDP screen by the controller or driver.
- Display drive Further, in this apparatus, in order to reduce power consumption, display driving is performed by selectively using a fixed potential method for the Z electrode based on the display load factor.
- the first and second methods are used in display drive control by utilizing the fact that the minimum value of the sustain discharge voltage (Vs) decreases as the display load factor decreases! Switch and select as shown in (1) and (2) below.
- Vs sustain discharge voltage
- at least two display load factor areas (ranges) are set for this switching and selection control.
- the narrow pulse method which is the second method, is used in a region where the display load factor is large (high).
- this method sustain discharge is possible at a low Vs compared to the fixed potential method, and the luminous efficiency of the discharge is high, so high brightness can be obtained.
- the fixed potential method which is the first method
- the display load factor is small (low). In this area, the display load factor is small! ⁇ Sustain discharge is possible at Vs.
- this method can be driven with less reactive power than the narrow pulse method, so a large number of sustains (eg 60 kHz) can be input, and high brightness can be obtained.
- a plurality of regions are set in the entire display load factor (0 to 100%) so as to correspond to the switching of the method in driving and the control of selection. For example, two low load areas (for example, 0 to 20%) and high load areas (for example, 20 to 100%) are set according to the characteristics of each method.
- the display load factor is detected or calculated by the controller or driver based on the input video data, and the two methods are switched by the controller or driver according to the comparison judgment with the display load factor area setting. Or choose.
- the driver performs driving according to the switching or selected method for the electrode group including the Z electrode of the PDP.
- the voltage clamp after the application of the resonance pulse in the LC resonance circuit Delay the switch timing.
- the apparatus detects or calculates a display load factor of a subfield in the display image in the circuit, and sustains a drive discharge drive waveform of the Z electrode for each subfield according to the display load factor of the subfield.
- the display load factor is detected or calculated by a controller or the like, and a control signal including switching or selection of the method is given to the driver accordingly, and a pulse corresponding to the method is given from the driver to the electrode group of the PDP. .
- FIG.l (a) and (b) are explanatory diagrams for comparing the PDPs of the four-electrode structure and the three-electrode structure, and (a) is the four-electrode structure of the embodiment and the base technology of the present invention. (B) shows the PDP cell structure of the three-electrode structure of the base technology.
- FIG. 2 is an exploded perspective view showing a partial structure of a PDP cell unit of a four-electrode structure in a PDP module according to an embodiment of the present invention and a base technology.
- FIG. 3 is a diagram showing a configuration of a PDP module in the embodiment of the present invention.
- FIG. 4 is an explanatory diagram showing a subfield division configuration in the PDP module according to the embodiment of the present invention.
- FIG. 5 is a diagram showing the driving waveform of one subfield in the PDP module according to the embodiment of the present invention, particularly when the narrow pulse method is used.
- FIG. 6 is an explanatory diagram showing display load factor area setting and drive system switching control in the PDP module according to the embodiment of the present invention.
- FIG. 7 are graphs showing the prediction (simulation) of the characteristics of each drive system and the corresponding display load in the PDP module with the four-electrode structure of this embodiment and the prerequisite technology.
- (A) shows the sustain number and luminance characteristics for the display load factor in each method
- (b) shows the sustain discharge system for the display load factor in each method. The power consumption characteristics are shown.
- FIG. 8 is an explanatory diagram showing other display load factor area setting and control in the PDP module according to the embodiment of the present invention.
- FIG. 9 are explanatory diagrams showing a fixed potential method and a narrow pulse method in sustain discharge driving in a PDP having a four-electrode structure according to an embodiment of the present invention and a prerequisite technology.
- A shows the case of the fixed potential method
- B shows the case of the narrow pulse method
- (c) is a table summarizing the characteristics of the above two methods.
- each PDP having a three-electrode structure and a four-electrode structure which is a prerequisite technology configuration, will be described below.
- Figures 1 (a) and 1 (b) compare the four-electrode structure and the three-electrode structure in the PDP. A partial area corresponding to the cell unit is shown on the substrate surface.
- Figure 1 (a) shows an example of a four-electrode PDP.
- the PDP of this embodiment also has such a structure.
- Figure 1 (b) shows an example of a three-electrode PDP.
- the front substrate has X and Y electrodes for sustaining discharge in parallel, and the back substrate is provided with the address electrodes 4 so as to intersect with each other.
- the PDP with a three-electrode structure shown in Fig. 1 (b) A structure with a Z electrode can be mentioned.
- FIG. 2 is an exploded perspective view showing a part of a cell unit of a PDP having a four-electrode structure. This structure is the same for the PDP with a three-electrode structure except for the Z electrode. The PDP in this embodiment also has this structure.
- a plurality of X electrodes and Y electrodes are arranged substantially in parallel in the lateral direction.
- a plurality of address electrodes 4 are arranged so as to intersect the X and Y electrodes in the vertical direction.
- a plurality of ribs 5 are provided between the first and second substrates in a vertical stripe shape that separates cells in the horizontal direction.
- a lattice-like form in which ribs are provided so as to partition cells in the vertical direction is also possible.
- Each region divided by the rib 5 is coated with a phosphor layer, and cells of each color of R, G, and B are configured as subpixels, and a pixel is configured by the set of subpixels.
- the X electrode is composed of an X metal electrode (also referred to as a bus electrode) la and an X transparent electrode (also referred to as a discharge electrode) lb connected so as to overlap therewith.
- the Y electrode is the same as the X electrode. 2a and Y transparent electrode 2b.
- the Y electrode functions as a scanning electrode.
- As an address operation data memory on the display screen is performed by counter discharge between the address electrode 4 and the Y electrode.
- As a sustain operation light is emitted by discharge in the lighting target cell on the display screen by surface discharge between XY.
- the X metal electrode la and the Y metal electrode 2a are made of copper or the like.
- the X transparent electrode lb and the Y transparent electrode 2b are composed of an ITO (indium tin oxide) layer film or the like.
- Each transparent electrode (lb, 2b) takes a T-shaped (or I-shaped) shape as shown as an example. Between XY, each transparent electrode (lb, 2b) is shaped so that the edge force facing each other electrode also the line force of each metal electrode (la, 2a) protrudes in the cell direction.
- transparent electrodes (lb, 2b) are also applied only between Y and X (reverse slits) in the form (normal method) provided only between the X and Y electrodes (forward slit).
- ALIS system So-called ALIS system
- gO is an interval (gap) for discharge between XY, and is a distance between edges of transparent electrodes lb and 2b of X and Y.
- the shorter the gap XY between XY the lower the sustain discharge voltage and the better the power efficiency, but the lower the cell emission efficiency.
- the longer the gO the better the cell emission efficiency, but the higher Vs and the lower the power efficiency.
- a plurality of X and Y electrodes are arranged substantially in parallel in the lateral direction. Furthermore, there is a Z electrode (Z) between each X and Y electrode (X—Y). Further, on the rear substrate of the PDP, the plurality of address electrodes 4 are arranged in the vertical direction so as to intersect with the respective electrodes (X, ⁇ , Z).
- a plurality of ribs 5 are provided between the first and second substrates, as in FIG. 1 (b), and each region divided by the ribs 5 has a phosphor as shown in FIG. Layer 6 is applied, cells of each color of R, G, and B are configured as subpixels, and a pixel is configured by a set of these subpixels.
- the X electrode is composed of an X metal electrode la and an X transparent electrode lb connected thereto.
- the Y electrode is composed of a Y metal electrode 2a and a Y transparent electrode 2b.
- the Z electrode disposed between XY consists of a Z metal electrode 3a and a Z transparent electrode 3b connected thereto.
- the Z transparent electrode 3b is similar to the X and Y transparent electrodes lb and 2b and has a protruding portion to the adjacent electrode.
- the edge of the transparent electrode 3b is opposed to the edge of the X bright electrode la and the Y transparent electrode 2a in parallel.
- the protruding portion of the Z transparent electrode 3b in the cell has, for example, a rectangular shape.
- an address operation is performed.
- a trigger discharge is performed in a narrow gap between XZ or YZ, and then between XY. This mechanism shifts to main discharge with a long gap.
- a gap gl between XY is secured widely, and a Z electrode is provided to improve the power efficiency by the trigger discharge.
- the Z metal electrode 3a is made of copper or the like.
- the Z transparent electrode 3b is composed of an ITO layer film or the like.
- Each of the X and Y transparent electrodes (lb, 2b) has a T-shape as an example, and the Z transparent electrode 3b has a rectangular shape as illustrated.
- each transparent electrode (lb, 2b) of X and Y has a structure in which the edge protrudes toward the Z transparent electrode 3b inside the cell.
- the Z transparent electrode 3b has a structure in which the edge protrudes from the line of the Z metal electrode 3a toward the cell outer side, that is, toward the X and Y electrodes. The opposing edges of the X, Y, and Z transparent electrodes are parallel.
- a transparent electrode (lb, 2b) is similarly provided between Y and X (reverse slit), and a Z electrode is further provided.
- a form corresponding to the so-called ALIS system provided is also possible.
- gl is a long gap between XY, and is a distance between edges of transparent electrodes (lb, 2b) of X and Y.
- G2 is the narrow gap between XZ and the distance between the edges of each transparent electrode (lb, 3b) of X and Z.
- G3 is the narrow gap between YZ and ⁇ and Z transparent electrodes (2b, 3b
- the configuration in FIG. 2 shows the configuration before bonding of the front substrate side and the rear substrate side of the PDP 10 in the present embodiment, and corresponds to the configuration in FIG.
- the X, Z, Y electrodes, and the dielectric layer 13 and the protective layer 14 covering the electrodes are formed.
- X transparent electrode lb and X metal electrode la constituting the X electrode, Y transparent electrode 2b and Y metal electrode 2a constituting the Y electrode, and Z transparent constituting the Z electrode Electrode 3b and Z metal electrode 3a are three-dimensionally formed in the same layer It should be noted that the layer on which the Z electrode is mounted on the first substrate may be other layers besides the same layer as the X and Y electrodes, for example.
- a plurality of address electrodes 4 and a dielectric layer 15 covering the address electrodes 4 are mounted on the back substrate 12. Further, a plurality of ribs 5 are formed between the front substrate 11 and the rear substrate 12 above the rear substrate 12 to divide the panel surface lateral direction of the PDP 10 corresponding to the cells. For example, phosphor layers 6a, 6b, and 6c of each color corresponding to sub-pixels of each color of R, G, and B are applied to the space divided by each rib 5.
- the front substrate 11 and the rear substrate 12 are pasted so as to face each other, and exhaust and discharge gases are sealed and sealed in the space, whereby the PDP 10 is configured.
- a plasma display device is configured by connecting the PDP 10 to a driver module including a flexible wiring board on which an IC chip to be a control circuit and a drive circuit is mounted, a chassis, and the like.
- the mechanism of sustain discharge in the form of PDP having the four-electrode structure is as follows. As a trigger discharge in sustain discharge, a voltage is applied between the Z electrode and the X electrode (or Y electrode) to generate a gas ionization process and to increase the charge density in the cell space. By this ionization process, the next long gap discharge between XY can be generated stably at low voltage (Vs).
- the long gap discharge between XY can be generated at a low voltage (that is, the electron temperature is low)
- the light emission in the positive column region can be utilized, and the light emission efficiency with a small loss of excitation energy can be obtained. improves.
- the point of high luminous efficiency by the four-electrode PDP is to generate the long gap discharge at a low voltage.
- Figure 9 shows these two systems as prerequisite technologies.
- Figure 9 (a) shows the narrow pulse system and
- Figure 9 (b) shows the fixed potential system.
- the PDP module of this embodiment uses these methods. Each method will be described below.
- Figures 9 (a) and 9 (b) show the drive waveform and discharge emission for one period of sustain discharge drive.
- Figure 9 (c) summarizes the characteristics of these two methods.
- a sustain pulse that is, an alternating pulse for sustain discharge driving
- a trigger discharge starts at a narrow gap between XZ (or YZ) and develops into a long gap discharge between XY. Therefore, it is possible to generate a long gap discharge at a lower voltage (Vs) than in a PDP having a long gap three-electrode structure without a Z electrode.
- the address electrode (A) 4 has a fixed potential because it is driven in the address period.
- sustain pulses having opposite phases are applied.
- the Z electrode is at a fixed potential.
- the discharge emission indicated by P occurs by driving each electrode.
- the narrow pulse method shown in Fig. 9 (b) has a narrow pulse, that is, the time width at the time of Hi voltage is short! ) Can generate a long gap discharge. Furthermore, in this narrow pulse discharge, a multi-stage discharge process is performed in response to the voltage change at the rise Z fall of the pulse applied to the Z electrode and the rise of the sustain pulse between XY. As shown by P, since long-gap discharge is included and discharge is sustained in multiple stages with low Vs and low instantaneous discharge current, the narrow pulse method is more effective than the fixed potential method for the same long gap discharge. Discharge with high energy utilization efficiency can be realized. However, in the narrow pulse method, since the noise is applied to the Z electrode, the reactive power for driving increases by that amount compared to the fixed potential method.
- the display load factor in the display image of the PDP screen is large.
- APC automatic power control
- the gas discharge power depends on the display load factor.
- the reactive power is power that is used by the circuit when applying a noise, and is proportional to the number of sustains.
- the sustain number is the sustain period of the field or subfield.
- the APC will be briefly described. Basically, the power increases as the display load factor increases, but it is a problem if the power becomes too high due to the high display load factor. Therefore, in APC, the power consumption is set so that the power increases in the area up to a certain display load factor that is set to a certain limit. Is controlling.
- the fixed potential method has a feature that the reactive power is small and the discharge power is large.
- the narrow pulse system has the characteristics that the reactive power is large and the discharge power is small.
- Figure 7 (b) shows the prediction of the characteristics of the power (lighting power of the sustain discharge system) according to the display load factor in the above two methods.
- the upper limit of the sustain count was set to 1500 cycles
- the upper limit of the sustain power (Ps) was set to 240W.
- the solid line shows the fixed potential method
- the broken line shows the narrow pulse method. In the case of the narrow pulse method, the power is substantially constant over the entire display load factor region.
- the sustain discharge power (Ps) [W] increases proportionally in the region (rl) where the display load factor is approximately 10%, but in the region (r2) beyond this, It shows that power control by APC is performed so that the power (Ps) power limit becomes approximately 240 W or less, which is almost constant.
- FIG. 7 (a) shows the prediction of the number of sustains and the luminance characteristics according to the display load factor in the two methods.
- the solid line shows the fixed potential method, and the broken line shows the narrow pulse method. Also for the fixed potential method! Narrow!
- the solid line indicates the sustain number ([cycle]), and the thick solid line indicates the luminance ([cd / m 2 ]).
- the brightness was assumed to be 1 cd / m 2 per sustain cycle, and the number of sustains and brightness were indicated by one broken line in the graph.
- the sustain number is constant in the region (the r 1) where the display load factor is up to a certain level (for example, 10%). A certain area (for example, 10%) or more (r2) Then, the sustain number and the brightness are decreased.
- the number of sustains and the brightness decrease according to the display load factor.
- the entire display load factor area (0 to 100%) can be broadly divided into two areas (corresponding to Fig. 6 described later). As a characteristic, it can be said that in one region where the display load ratio is relatively low (R1), the discharge power (sustained discharge system power) is large with the reactive power being large. Conversely, in the other region (R2) where the display load factor is relatively high, it can be said that the reactive power is small and the discharge power is large.
- FIG. 7 (a) when the display load factor is about 20%, the magnitude of each luminance in the fixed potential method and the narrow pulse method is reversed. That is, it can be seen that the effective method is different in terms of luminance (light emission efficiency) between the region (R1) of about 20% or less and the region (R2). Therefore, in the present embodiment, the display load factor area is divided and set based on this display load factor (20%).
- the controller controls the driver by switching or selecting the two methods according to the display load factor and the display load factor area setting.
- a pulse corresponding to the above method is applied from the dryno to the PDP electrode group.
- FIG. 3 is a diagram showing, in particular, the configuration of the electrode, driver, and controller of PDP 10 as the configuration of the PDP module having the four-electrode structure in the present embodiment.
- This PDP module is configured to include a logic circuit 100 including a PDP 10, a drive circuit for each electrode (17, 18, 19, 21), a controller 20, and the like.
- the detailed configuration of the PDP 10 is shown in FIG.
- the front substrate 11 has electrodes ⁇ Xl to Xm ⁇ and electrodes ⁇ Yl to Ym ⁇ .
- the back substrate 12 has address electrodes (A) 4.
- the number of electrodes m is 1024, for example.
- Zo electrodes ⁇ Zl to Zm ⁇ are provided on the positive slit side.
- a form in which a Ze electrode is similarly provided on the reverse slit side is also possible.
- Each drive circuit has an X drive circuit 17, a Y drive circuit 18, and an address drive circuit 19 for driving the X electrode, the Y electrode, and the address electrode 4 in the PDP 10, respectively.
- Z A Z drive circuit 21 is provided for operation.
- the logic circuit 100 controls the drive by sending a control signal to these drive circuits (17, 18, 19, 21), with the controller 20 controlling the entire display as a center.
- the logic circuit 100 includes a controller 20, a data conversion circuit 72, and a display rate detection circuit 73.
- the controller 20 includes, for example, an IC for driving and controlling the X, ⁇ , and Z electrodes and an IC for driving and controlling the address electrodes 4.
- the data conversion circuit 72 performs necessary data conversion processing based on video data (D) input from the outside to create display data.
- the display rate detection circuit 73 detects and calculates the display load factor based on video data input from the outside or display data from the data conversion circuit 72.
- a display load factor area is set in advance.
- the controller 20 determines the display load factor region, and the sustain number and the Z drive pulse width are determined. Based on this, control signals are sent to each drive circuit (17, 18, 19, 21) to control the display drive for the PDP10. In particular, the controller 20 sends a switching control signal (s2) of a method according to the display load factor to the Z drive circuit 21. Accordingly, the driving method for the Z electrode of the PDP 10 from the Z driving circuit 21 is switched between the fixed potential method and the narrow pulse method.
- the Z drive circuit 21 has a circuit configuration capable of driving the Z electrode of the PDP 10 by either of the two methods.
- Zo odd electrode
- the Y electrode functions as a scanning electrode.
- a scan pulse is sequentially applied from the Y drive circuit 18 to the Y electrode, and a data signal is applied from the address drive circuit 19 to the address electrode (A) 4 in synchronization therewith.
- FIGS 4 and 5 show examples of drive waveforms for the PDP 10 in the PDP module of the present embodiment.
- Figure 4 shows the subfield division configuration.
- Figure 5 shows an example of the driving waveform for one subfield (in the case of the narrow pulse method).
- Each SF consists of a reset period Tr, an address period Ta, and a sustain period Ts.
- the address period Ta the entire SF is charged for the data memory. That is, the display target cell is activated.
- sustain period Ts sustain discharge is performed by applying a sustain pulse to the X, ⁇ , and Z electrodes, and light is emitted from the active cell.
- the reset period Tr the display of the entire SF is reset by a predetermined pulse.
- the sustain period Ts in each SF varies depending on the gradation control.
- the drive waveform shown in FIG. 5 is an example of display drive when using the narrow pulse method described above.
- this PDP module for the X, Y electrode and address electrode (A) 4, a drive waveform conforming to the conventional three-electrode PDP is applied, and for the Z electrode, for the reset period Tr and address period Ta, A drive waveform similar to that of the X electrode (in phase) can be applied, and the drive can be driven with a narrow pulse applied during the sustain period Ts.
- the fixed potential method is used, it is changed to a fixed potential in the sustain period Ts of the Z electrode drive waveform.
- the display rate detection circuit 73 of the logic circuit 100 detects the display load factor (si) of each subfield in the field. Then, the controller 20 determines the area classification (Rl, R2) of the detected display load factor (si), and switches between the two methods corresponding to the corresponding area (Rl, R2). In order to perform the sustain discharge drive by either of the two methods, the controller 20 gives a switching control signal (s2) corresponding to the selected method to the Z drive circuit 21. Then, in the sustain discharge driving for the Z electrode of the PDP 10 from the Z driving circuit 21, the pulse corresponding to the switching control signal (s2) is switched and driven.
- the characteristics of luminance and power consumption with respect to the display load factor are different between the fixed potential method and the narrow pulse method. Therefore, in the example shown in FIG. 7, in the region where the display load factor is less than 20% (R1), the sustain discharge driving of the Z electrode fixed potential method can obtain higher brightness, and the region where the display load factor is 20% or more (R2). ), The Z electrode narrow pulse system sustain discharge drive has a higher brightness. Therefore, if control is performed so that the two methods are switched according to the region (Rl, R2), high brightness is obtained in the entire display load factor region, and power consumption is also reduced.
- a display load factor in sub-field units and a display load factor in field units can be considered.
- the display load factor in units of subfields is the rate of lighted cells in one subfield.
- ⁇ X be the display load factor of subfield SFx.
- the number of subfields per field is ⁇ .
- the display load factor (APL) for each field reflects the difference in the sustain period Ts for each subfield, and is calculated as follows.
- the number of sustains is sx
- the luminance weight is wx
- the display load factor for each subfield is Let ⁇ ⁇ .
- ⁇ takes 1 to ⁇ .
- the luminance weight w, wl + ... + wn 1.
- the luminance weight wx of the subfield SFx is calculated by the following (Equation 1).
- the display load factor (APL) for each field is calculated by (Equation 2) below.
- APL a l -wl + «2-w2 + whil + ⁇ ⁇ -wn ⁇ ⁇ ⁇ ⁇ (Formula 2)
- FIG. 6 shows the method switching control and display load factor region setting in the PDP module of the present embodiment.
- two display load factor areas R1 and R2 are set.
- the fixed potential method is selected, and when it is determined that the display load factor is within the region R2, it is narrow.
- Select the pulse method The characteristics when using each method are shown in Figure 7 above.
- FIG. 8 shows a setting and control method different from the control and setting shown in FIG. FIG. 6 shows a case where the load is simply divided into a low load region (R1) and a high load region (R2). Not limited to this, a plurality of areas may be set and controlled step by step.
- R3 that overlaps two regions (Rl, R2) is provided. Or you may provide the intermediate
- an area (R1) where the display load factor is 0 to 50%, an area (R2) where the display load factor is 50 to 100%, and an area (R3) where the display load factor is 20 to 50% are set.
- a control example is as follows. It is assumed that the narrow pulse method is used in the region R2, and the display load factor gradually decreases from 50% to 20% according to the time display. At this stage, the narrow pulse method continues to be used in region R3. The Then, when the display load factor falls to the region R1 of 20% or less, the fixed potential method is switched. Furthermore, when the display load factor shows a tendency to increase from 20% to 50%, the fixed potential method is still used in the region R3. Then, when the display load factor rises to the region R2 where the display load factor is 50% or more, the narrow pulse system is switched.
- Embodiment 2 will be described as another embodiment of the present invention.
- the narrow pulse method described above applies a narrow pulse to the Z electrode for each discharge.
- the Z electrode driving pulse hereinafter referred to as the narrow pulse method when using the narrow pulse method for the Z electrode
- the number of sustains is determined so that Z pulses are thinned out step by step according to the display load factor.
- the Z pulse is stepped in response to a decrease in the display load factor, such as applying a Z pulse every second discharge and applying a Z pulse every second discharge. Determine the sustain number so that it is thinned out.
- the intermediate region region such as R3 shown in Fig. 8 between the two regions (Rl, R2) in the entire display load factor region, and to improve the luminance.
- Embodiment 3 of the present invention will be described.
- the Z pulse is thinned out step by step in response to a decrease in the display load factor, and the sustain number is input.
- the display load is the same as in the second embodiment.
- the amplitude voltage, not the number of Z pulses applied is changed stepwise.
- the drive waveform is determined and driven from the Z drive circuit 21 so as to decrease the amplitude voltage of the Z pulse stepwise as the display load factor decreases.
- the reactive power in the circuit is reduced and the number of sustains is input, that is, more sustain pulses are printed.
- the reason for the large reactive power of the Z pulse is the Lo voltage clamp.
- a clamp is a forced fall.
- the narrower the width the better the light emission efficiency.
- a clamping operation that forcibly falls to the Lo voltage in the middle of one pulse is performed.
- power consumption increases due to the execution of clamping to this Lo voltage.
- Embodiment 4 in the control when using the narrow pulse method for the Z electrode, the timing of clamping to the Lo voltage is gradually delayed in accordance with the decrease in the display load factor. To control. As a result, by reducing the reactive power, it is possible to increase the number of sustains and improve the luminance at low load.
- a fifth embodiment of the present invention will be described.
- a method for sustain discharge driving of a four-electrode structure PDP there is also a method in which the same sustain pulse as the X electrode (or Y electrode) is applied to the Z electrode (referred to as the X-Z in-phase method).
- the sustain discharge behavior appears to move as a potential between the Z electrode and the X electrode, that is, between the Z electrode and the Y electrode (YZ A sustaining discharge occurs in the gap g3).
- This is not a high-efficiency long-gap discharge (a discharge at the gap XY between gl), but since it is a narrow gap, discharge can be generated at a lower Vs than the fixed potential method.
- the interelectrode capacitance between the Z electrode and the X electrode is not visible, reactive power will not increase like the narrow pulse method! / ,.
- the X—Z common mode is obtained in the low load region (R1) as shown in FIG.
- switching control is performed so that the narrow pulse method for the Z electrode is used in the high load region (R2).
- the X-Z in-phase method and the narrow pulse method for the Z electrode can be driven at a lower Vs than the fixed potential method. Therefore, according to the combination of methods in the fifth embodiment, Vs can be set lower than that in the first embodiment, and the light emission efficiency of the narrow pulse method for the Z electrode can be further improved.
- the display load factor region is controlled by controlling the driving of the PDP 10 in the PDP module to the electrode group, particularly the switching of the sustain discharge driving method for the Z electrode.
- the overall brightness of the PDP can be improved and the power consumption can be reduced.
- a long gap discharge with high luminous efficiency can be generated a sufficient number of times in the entire display load factor region, and the luminance can be improved.
- the present invention can be used for a display device having a panel with a four-electrode structure.
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- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
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Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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CNA2005800498035A CN101180670A (zh) | 2005-07-26 | 2005-07-26 | 等离子体显示装置 |
PCT/JP2005/013624 WO2007013139A1 (ja) | 2005-07-26 | 2005-07-26 | プラズマディスプレイ装置 |
JP2007526766A JP4313412B2 (ja) | 2005-07-26 | 2005-07-26 | プラズマディスプレイ装置 |
US11/919,995 US7990341B2 (en) | 2005-07-26 | 2005-07-26 | Plasma display device |
Applications Claiming Priority (1)
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PCT/JP2005/013624 WO2007013139A1 (ja) | 2005-07-26 | 2005-07-26 | プラズマディスプレイ装置 |
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WO2007013139A1 true WO2007013139A1 (ja) | 2007-02-01 |
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PCT/JP2005/013624 WO2007013139A1 (ja) | 2005-07-26 | 2005-07-26 | プラズマディスプレイ装置 |
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US (1) | US7990341B2 (ja) |
JP (1) | JP4313412B2 (ja) |
CN (1) | CN101180670A (ja) |
WO (1) | WO2007013139A1 (ja) |
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US20090225007A1 (en) * | 2006-02-01 | 2009-09-10 | Junichi Kumagai | Driving method of plasma display panel and plasma display apparatus |
Citations (8)
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JPH0744127A (ja) * | 1993-08-02 | 1995-02-14 | Fujitsu Ltd | プラズマ・ディスプレイパネル |
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WO2000005740A1 (fr) * | 1998-07-21 | 2000-02-03 | Hitachi, Ltd. | Tube a decharge pour afficheur et procede de commande d'un tel tube |
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KR100319095B1 (ko) * | 1999-03-02 | 2002-01-04 | 김순택 | 보조 전극을 갖는 플라즈마 표시 패널의 구동 방법 |
JP2002110047A (ja) | 2000-09-29 | 2002-04-12 | Fujitsu Hitachi Plasma Display Ltd | プラズマディスプレイ装置 |
KR100426186B1 (ko) * | 2000-12-28 | 2004-04-06 | 엘지전자 주식회사 | 플라즈마 디스플레이 패널 및 그 구동방법 |
JP4669633B2 (ja) * | 2001-06-28 | 2011-04-13 | パナソニック株式会社 | ディスプレイパネルの駆動方法及びディスプレイパネルの駆動装置 |
KR100441523B1 (ko) * | 2001-09-28 | 2004-07-23 | 삼성에스디아이 주식회사 | 플라즈마 표시 패널의 소비 전력을 제어하는 방법 및 장치 |
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TW200421233A (en) | 2002-11-29 | 2004-10-16 | Matsushita Electric Ind Co Ltd | Plasma display panel device and related drive method |
JP2004212645A (ja) * | 2002-12-27 | 2004-07-29 | Fujitsu Hitachi Plasma Display Ltd | プラズマディスプレイパネルの駆動方法およびプラズマ表示装置 |
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JP4647220B2 (ja) * | 2004-03-24 | 2011-03-09 | 日立プラズマディスプレイ株式会社 | プラズマディスプレイ装置の駆動方法 |
JP4180034B2 (ja) * | 2004-09-21 | 2008-11-12 | パイオニア株式会社 | プラズマ表示装置及びプラズマ表示装置に用いられる駆動方法 |
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2005
- 2005-07-26 WO PCT/JP2005/013624 patent/WO2007013139A1/ja active Application Filing
- 2005-07-26 CN CNA2005800498035A patent/CN101180670A/zh active Pending
- 2005-07-26 JP JP2007526766A patent/JP4313412B2/ja not_active Expired - Fee Related
- 2005-07-26 US US11/919,995 patent/US7990341B2/en not_active Expired - Fee Related
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JPH0744127A (ja) * | 1993-08-02 | 1995-02-14 | Fujitsu Ltd | プラズマ・ディスプレイパネル |
JPH08306318A (ja) * | 1995-05-02 | 1996-11-22 | Nec Corp | プラズマディスプレイパネル及びその駆動方法 |
WO2000005740A1 (fr) * | 1998-07-21 | 2000-02-03 | Hitachi, Ltd. | Tube a decharge pour afficheur et procede de commande d'un tel tube |
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US20090096717A1 (en) | 2009-04-16 |
JP4313412B2 (ja) | 2009-08-12 |
JPWO2007013139A1 (ja) | 2009-02-05 |
CN101180670A (zh) | 2008-05-14 |
US7990341B2 (en) | 2011-08-02 |
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