WO2010029620A1 - 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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- WO2010029620A1 WO2010029620A1 PCT/JP2008/066359 JP2008066359W WO2010029620A1 WO 2010029620 A1 WO2010029620 A1 WO 2010029620A1 JP 2008066359 W JP2008066359 W JP 2008066359W WO 2010029620 A1 WO2010029620 A1 WO 2010029620A1
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- address
- switch
- plasma display
- power recovery
- inductor
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/296—Driving circuits for producing the waveforms applied to the driving electrodes
- G09G3/2965—Driving circuits for producing the waveforms applied to the driving electrodes using inductors for energy recovery
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
- G09G3/293—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for address discharge
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/06—Details of flat display driving waveforms
- G09G2310/066—Waveforms comprising a gently increasing or decreasing portion, e.g. ramp
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/028—Generation of voltages supplied to electrode drivers in a matrix display other than LCD
Definitions
- the present invention relates to a plasma display device, and more particularly to a plasma display device having an address driver for driving an address electrode.
- a display device for displaying a display panel by driving an address electrode having a capacitive load for each line based on display data, a plurality of power lines for supplying a plurality of voltage levels, and an input video
- a control circuit that creates display data from signals and an address drive circuit that applies a plurality of voltage levels to address electrodes based on the display data.
- the address drive circuit selects a plurality of voltage levels for a plurality of address electrodes.
- a charge distribution period is provided between the address drive period of one line of the address electrode and the next address drive period, and the plurality of address electrodes are separated from the power line during the charge distribution period.
- FIG. 16 is a diagram showing an example of a conventional address driver.
- the address electrode A1, the address electrode A2, and the address electrode A3 each constitute a capacitive load cell Cp, and an address driver is connected to each of the address electrodes A1 to A3.
- the address driver includes a high-level supply switch SW8 and a low-level supply switch SW9 as output stages for each bit so that a high-level potential or low-level electricity can be supplied to the capacitive load Cp.
- the charge share switch SW7 is connected to the capacitive load Cp of each bit, and the switches SW7 are all connected in parallel to the charge share terminal CS.
- the switches SW8 and SW9 in the output stage are set in total.
- the charge sharing switch SW7 is turned on after the switch is turned off, the charge remaining in the address electrodes A1 to A3 can be supplied to all the address electrodes A1 to A3 by averaging, and the potential at that time Can be used as the starting point to output the next address driver.
- FIG. 17 is a diagram showing an example of display data in the address period.
- FIG. 17A is a diagram showing a staggered display pattern in which lighting (indicated by ⁇ in FIG. 17) and non-lighting (indicated by x in FIG. 17) exist equally in each line.
- the address electrodes A1 and A3 are at a high level potential
- the address electrode A2 is at a low level potential, all of which are short-circuited by the switch SW7, and then the address display pattern at time t2.
- the charges stored in the address electrodes A1 and A3 at the time t1 are averaged and supplied to the address electrodes A1 to A3 before the time t2, and the address electrode A2 is clamped to a high level potential from the potential after the charge is supplied. Then, the address electrodes A1 and A3 are clamped to a low level potential. Therefore, from time t1 to time t2, charges are supplied from the address electrodes A1 and A3 to the address electrode A2, and the charge sharing operation contributes to reduction of power consumption. This operation is similarly performed when the display pattern is switched from time t2 to time t3. Thus, when the balance between lighting and non-lighting is good, the charge sharing operation is performed appropriately.
- FIG. 17B is a diagram showing an example of display data having a striped pattern.
- all the address electrodes A1 to A3 are lit at time t1, and all the address electrodes A1 to A3 are not lit at time t2.
- the address electrodes A1 to A3 remain at a high level potential, and then all are unlit at time t2.
- the charges remaining in the address charges A1 to A3 all flow to the ground.
- all the address charges A1 to A3 are all lit display patterns, so that the output stage switches from the low level potential to the high level potential at this time. The operation of discarding all the charges stored at t1 and then supplying the potential from the beginning must be performed.
- the charge sharing can be efficiently performed and the power can be effectively used.
- the lighting balance is poor, there is a problem that power consumption cannot be effectively reduced.
- an object of the present invention is to provide a plasma display device that can reliably perform charge sharing and reduce power consumption even in the case of a display pattern with a poor balance between lighting and non-lighting.
- a plasma display device includes a plurality of scan electrodes extending in the first direction and a plurality of addresses extending in the second direction so as to intersect the scan electrodes.
- a plasma display panel including electrodes; An address driver for driving the address electrodes; A power recovery circuit including an inductor and a capacitor; A switch provided in the address driver and configured to switch connection and non-connection between the address electrode and the power recovery circuit.
- the address electrode can be connected to the power recovery circuit, and when the balance between lighting and non-lighting of the display pattern is poor, LC resonance can be generated and power can be recovered by the capacitor. it can.
- the 2nd invention is the plasma display apparatus which concerns on 1st invention
- the address driver includes a plurality of the switches corresponding to the address electrodes
- the power recovery circuit is provided outside the address driver, A plurality of the switches are connected in parallel to the power recovery circuit.
- a large capacity element can be used in the power recovery circuit, and the address driver can be made up of small elements, and a space-saving and high power recovery efficiency plasma display device can be obtained.
- a third invention is the plasma display device according to the second invention, wherein
- the address driver includes an address driver output stage for supplying a high-level or low-level potential to the address electrode, Control means for controlling an on-time of the switch according to a switching ratio between the high-level potential and the low-level potential of the address driver output stage is provided.
- a fourth invention is the plasma display device according to the third invention, wherein The control means shortens the ON time when the switching ratio between the high-level potential and the low-level potential of the address driver output stage is small, and lengthens the ON time when the switching ratio is large. .
- connection time with the power recovery circuit in accordance with the switching ratio between lighting and non-lighting. Therefore, when there is a large amount of charge to be recovered or the amount of power recovered, the connection time with the power recovery circuit Therefore, it is possible to perform control such that the power consumption becomes longer, and appropriate power recovery and effective use of the recovered power can be performed.
- a fifth invention is the plasma display device according to the fourth invention, wherein: The power recovery circuit is provided corresponding to each address driver.
- 6th invention is the plasma display apparatus which concerns on 4th invention,
- the power recovery circuit is provided in common for the plurality of address drivers.
- the 7th invention is the plasma display apparatus which concerns on 1st invention
- the switch has a first switch and a second switch connected in parallel to one of the address electrodes
- the power recovery circuit includes a first inductor, a second inductor, and a capacitor connected in parallel, The first switch and the first inductor, and the second switch and the second inductor are electrically connected to each other.
- An eighth invention is the plasma display device according to the seventh invention, wherein
- the address driver has a first branch path including the first switch and a second branch path including the second switch; A first diode inserted and connected in the first branch path so that the address electrode side is a cathode and the first inductor side is an anode, and in the second branch path, the address electrode side is And a second diode inserted and connected at the anode so that the second inductor side becomes a cathode.
- a ninth invention is the plasma display device according to the eighth invention,
- the address driver includes an address driver output stage for supplying a high-level or low-level potential to the address electrode,
- the first switch is turned on before the address driver output stage switches the output to the address electrode from the low level to the high level potential.
- the second switch is turned on before the address driver output stage switches the output to the address electrode from the high level to the low level.
- the tenth invention is the plasma display device according to the ninth invention,
- the timing at which the first switch is turned on is different from the timing at which the second switch is turned on.
- An eleventh invention is the plasma display device according to the tenth invention, wherein
- the address driver includes a plurality of sets of the first branch path and the second branch path corresponding to the address electrodes,
- the power recovery circuit is provided outside the address driver,
- the plurality of first branch paths are connected in parallel to the first inductor of the power recovery circuit, and the plurality of second branch paths are connected in parallel to the second inductor of the power recovery circuit. It is characterized by being.
- a twelfth invention is the plasma display apparatus according to the eleventh invention,
- the power recovery circuit is provided corresponding to each address driver.
- a thirteenth invention is the plasma display apparatus according to the eleventh invention,
- the power recovery circuit is provided in common to the plurality of address drivers.
- a plasma display device is a plasma display panel including a plurality of scan electrodes extending in a first direction and a plurality of address electrodes extending in the second direction so as to intersect the scan electrodes.
- An address driver for driving by applying an address pulse to the address electrode;
- a charge share switch provided in the address driver, for applying a voltage obtained by averaging charges remaining in each of the plurality of address electrodes, one end connected to the address electrode and the other end connected in common
- a power recovery circuit connected to the other end of the switch connected in common and recovering the charge by LC resonance when the averaged voltage is different from a voltage approximately half of the address pulse. It is characterized by that.
- the power recovery circuit can recover power and use recovered power, and the balance between lighting and non-lighting can be achieved. Even in a bad case, it is possible to reliably save power.
- a fifteenth invention is the plasma display device according to the fourteenth invention, wherein
- the switch has a first switch and a second switch connected in parallel to the address electrode,
- the power recovery circuit includes a first inductor, a second inductor, and a capacitor connected in parallel to a capacitor; The first switch and the first inductor, and the second switch and the second inductor are electrically connected to each other.
- a sixteenth aspect of the invention is the plasma display device according to the fifteenth aspect of the invention,
- the address driver has a first branch path including the first switch and a second branch path including the first switch; In the first branch path, a first diode having an anode on the first inductor side and a cathode on the address electrode side is inserted and connected, In the second branch path, a second diode having a cathode on the second inductor side and an anode on the address electrode side is inserted and connected.
- FIG. 1 is an overall configuration diagram of a plasma display device according to Embodiment 1.
- FIG. 1 is an exploded perspective view of an example of a plasma display panel 10.
- FIG. It is the figure which showed the drive voltage waveform applied to each electrode of 1 subfield.
- FIG. 3A shows a drive waveform of the sustain electrode Xi.
- FIG. 3B is a diagram showing a drive waveform of the scan electrode Yi.
- FIG. 3C shows a driving waveform of the address electrode Aj.
- FIG. 3 is a diagram illustrating an example of a configuration diagram of an address driving circuit 20 according to the first embodiment.
- 3 is a diagram illustrating an example of an address pulse output circuit 22 and a power recovery circuit 25.
- FIG. It is the figure which showed an example of the waveform of an address pulse.
- FIG. 1 is an exploded perspective view of an example of a plasma display panel 10.
- FIG. It is the figure which showed the drive voltage waveform applied to each electrode of 1 subfield.
- FIG. 6A is a diagram showing an example of a voltage waveform at the time of rising and falling of the address pulse.
- FIG. 6B is a diagram showing an example of a voltage waveform when the address pulse falls.
- FIG. 3 is a diagram illustrating an example of a configuration of an address driver 21 according to the first embodiment.
- 4 is a diagram illustrating an example of switching timing of an address driver 21.
- FIG. 5 is a diagram illustrating an example of a method for installing a power recovery circuit 25.
- FIG. It is the figure which showed an example of the installation method of the electric power recovery circuit 25 different from FIG. It is the figure which showed the example of the installation method of the electric power collection
- FIG. 2 is a diagram showing an example of a voltage waveform at the time of rising and falling of the address pulse.
- FIG. 6B is a diagram showing an example of a voltage waveform when the address pulse falls.
- FIG. 5 is a diagram showing an example in which a plurality of 1-bit address pulse output circuits 22a are provided in an address driver IC 22a.
- FIG. 6 is a diagram illustrating an example of a voltage waveform of an address pulse according to the second embodiment.
- FIG. 15A is a diagram showing an example of a voltage waveform having the same phase of rising and falling.
- FIG. 15B is a diagram illustrating an example of voltage waveforms having different phases at the time of rising and at the time of falling. It is the figure which showed an example of the conventional address driver. It is the figure which showed the example of the display data in an address period.
- FIG. 17A shows an example of a staggered display pattern.
- FIG. 17B shows an example of striped display data.
- FIG. 1 is an overall configuration diagram of a plasma display device according to a first embodiment to which the present invention is applied.
- the plasma display apparatus according to the present embodiment includes a plasma display panel 10, an address driving circuit 20, a sustain driving circuit 30, a scan driving circuit 40, and a drive control circuit 50.
- the plasma display panel 10 is a display panel for displaying an image.
- the plasma display panel 10 includes a plurality of sustain electrodes X1, X2, X3,... And a plurality of scan electrodes Y1, Y2, Y3,.
- each of the sustain electrodes X1, X2, X3,... Or their generic name is referred to as a sustain electrode Xi, and each of the scan electrodes Y1, Y2, Y3,. It is called Yi. i means a subscript.
- the plasma display panel 10 includes a plurality of address electrodes A1, A2, A3,... Extending in the vertical direction.
- discharge cells Cij are formed at positions where the sustain electrodes Xi, the scan electrodes Yi, and the address electrodes Aj intersect.
- the discharge cells Cij constitute pixels, and the plasma display panel 10 can display a two-dimensional image.
- the sustain electrode Xi and the scan electrode Yi in the discharge cell Cij have a space between them and constitute a capacitive load.
- the scan electrode Yi and the address electrode Aj in the discharge cell Cij also constitute a capacitive load.
- the address drive circuit 20 is a circuit for driving the address electrode Aj, and supplies an address pulse having a predetermined voltage value to the address electrode Aj in the address period Ta to generate an address discharge.
- the address drive circuit 20 includes a plurality of address drivers 21. For example, in the plasma display panel 10 having horizontal 1920 ⁇ vertical 1080 pixels, there are 1920 pixels in the horizontal (horizontal) direction, which are divided and driven by a plurality of address drivers 21.
- Each address driver 21 may be configured, for example, as an IC (Integrated Circuit).
- the scan drive circuit 40 is a circuit for driving the scan electrode Yi, and includes a scan circuit 41, a sustain circuit 42, and a reset circuit 43.
- the scan circuit 41 supplies a scan pulse having a predetermined voltage value to the scan electrode Yi in accordance with the control of the drive control circuit 50 and the sustain circuit 42 to generate an address discharge.
- the sustain circuit 42 supplies the sustain pulses having the same voltage to the scan electrodes Yi, and generates a sustain discharge.
- the reset circuit 43 supplies a reset pulse having a predetermined voltage value to the scan electrode Yi according to the control of the drive control circuit 50, generates a reset discharge, and initializes and arranges the wall charge of the discharge cell Cij.
- the sustain drive circuit 30 is a circuit for driving the sustain electrode Xi, and supplies a sustain pulse having the same voltage to the sustain electrode Xi to generate a sustain discharge.
- Each sustain electrode Xi is interconnected and has the same voltage level.
- the drive control circuit 50 is a circuit that drives and controls the address drive circuit 20, the sustain drive circuit 30, and the scan drive circuit 40.
- the drive control circuit 50 includes a subfield conversion circuit 51, an address data generation circuit 52, a scan data generation circuit 53, an on time control circuit 54, and a maintenance data generation circuit 55.
- the subfield conversion circuit 51 subdivides one frame or one field image into a plurality of subfields. Perform conversion. Based on the converted subfield, the address data generation circuit 52 and the scan data generation circuit 53 generate address data and scan data necessary for driving the address drive circuit 20 and the scan circuit 41 of the scan drive circuit 40. The sustain data generation circuit 55 generates sustain data necessary for driving the sustain drive circuit 30 and the sustain circuit 42 of the scan drive circuit 40.
- the on-time control circuit 54 controls the connection time between the address electrode Aj and the power recovery circuit (not shown in FIG. 1) when performing power recovery of the address driver 21 in the address drive circuit 20 in address discharge. It is a circuit to do.
- the connection between the address electrode Aj and the power recovery circuit is performed by a switch (not shown in FIG. 1), but the on-time control circuit 54 turns on the switch to connect the address electrode Aj and the power recovery circuit. Control the time.
- the on-time control circuit 54 detects the lighting / non-lighting state of the address electrode Aj from the address data generating circuit 52 for the line being scanned and the line to be scanned next, and addresses according to the lighting / non-lighting switching ratio. An appropriate time is calculated as the connection time between the electrode Aj and the power recovery circuit, and the ON time of the switch is controlled.
- the specific contents of the control and details of the specific configuration in the address drive circuit 20 will be described later.
- FIG. 2 is a diagram showing an example of an exploded perspective view of the plasma display panel 10.
- the plasma display panel 10 has a front substrate 11 and a back substrate 15 and is configured by bonding them facing each other.
- the front substrate 11 includes a front glass substrate 12, and a plurality of sustain electrodes Xi and scan electrodes Yi extend on the inner surface of the front substrate 11 in the horizontal direction of the screen and are alternately arranged in the vertical direction.
- the front substrate 11 is configured by covering the sustain electrode Xi and the scan electrode Yi with the dielectric layer 13 and the protective film 14.
- the back substrate 15 has a back glass substrate 16 on the outside, and a plurality of address electrodes Aj are formed on the surface of the back glass substrate 16 so as to extend in the vertical direction of the screen, and the dielectric layer 17 is formed thereon. Covered.
- a raised partition wall (rib) 18 is formed on the dielectric layer 17.
- a partition 18 forms a partition on the opposing surface of the front substrate 11 and the back substrate 15, thereby forming a plurality of discharge cells Cij.
- a region in the barrier rib at a position where the sustain electrode Xi and the scan electrode Yi of the front substrate 11 intersect with the address electrode Aj forms one discharge cell Cij.
- a phosphor 19 is formed on the surface of the discharge cell Cij, that is, between the adjacent barrier ribs 18. There are three types of phosphor 19, red phosphor 19R, green phosphor 19G, and blue phosphor 19B, and these three colors constitute one pixel.
- the discharge space between the front substrate 11 and the back substrate 15 is filled with a discharge gas such as Ne—Xe, and excites the red phosphor 19R, the green phosphor 19G, and the blue phosphor 19B by ultraviolet rays generated by the discharge. Each color emits light.
- a discharge gas such as Ne—Xe
- a scan pulse is sequentially applied from Y1 to Yi to the line of the scan electrode Yi for performing address selection, and an address discharge is applied to the discharge cell Cij to which the on signal is applied according to the on / off signal of the address electrode Aj.
- the address discharge is not generated in the discharge cell Cij to which the off signal is applied.
- the period for generating the address discharge and selecting the discharge cell Cij to emit light is called an address period.
- a sustain pulse is applied to each of the sustain electrodes Xi and the scan electrodes Yi, and the discharge cells Cij that have undergone address discharge store sufficient wall charges, so that sustain discharge occurs and light is emitted.
- the discharge cell Cij that has not occurred does not emit sustain discharge and does not emit light. Note that a period during which the sustain discharge occurs is called a sustain period.
- the plasma display panel 10 having the configuration shown in FIG. 2 may be applied to the plasma display device according to the first embodiment. Since the plasma display apparatus according to the present embodiment can be applied to various plasma display panels 10 that perform address discharge, in addition to the plasma display panel 10 of the form shown in FIG. 2, a plasma display that performs address discharge. If it is the panel 10, the plasma display panel 10 of a various aspect is applicable.
- FIG. 3 is a diagram showing drive voltage waveforms applied to each of the sustain electrode Xi, the scan electrode Yi, and the address electrode Aj in one subfield.
- 3A is a diagram showing a drive waveform of the sustain electrode Xi
- FIG. 3B is a diagram showing a drive waveform of the scan electrode Yi
- FIG. 3C is a diagram showing the address electrode Aj. It is the figure which showed these drive waveforms.
- the X erase slope wave 60 and the Y erase voltage 70 are applied to the sustain electrode Xi and the scan electrode Yi, respectively.
- a Y write slope wave 71 and an X negative voltage 61 are applied to the scan electrode Yi and the sustain electrode Xi.
- the Y compensation slope wave 72 and the X positive voltage 62 are applied to the scan electrode Yi and the sustain electrode Xi in order to erase the charge formed in the discharge cell Cij while leaving a necessary amount.
- a reset state in which charges are appropriately formed in the discharge cells Cij is obtained.
- address discharge is performed in order to select and determine the discharge cell Cij that emits light.
- a scan pulse 73 for determining the scan electrode Yi in the row direction and an address pulse 83 having a high level potential for determining the address electrode Aj to be displayed in the column direction are simultaneously applied to the scan electrode Yi and the address electrode Aj, respectively. Is done.
- the scanning pulse 73 is sequentially applied as Y1, Y2,... Yi with the timing shifted for each row, and the high-level potential address pulse 83 is matched with the application timing of the scanning pulse 73 applied for each row.
- the voltage is applied at the timing of generating a discharge in the discharge cell Cij to be displayed located at the intersection of the scan electrode Yi and the address electrode Aj.
- the light emitting cell is selected according to the output signal of the address pulse 83.
- a negative voltage is applied to the scanning pulse 73, and a positive voltage is applied to the address pulse 83.
- an X positive voltage 62 is applied to the sustain electrode Xi as shown in FIG.
- wall charges are appropriately formed on the sustain electrode Xi and the scan electrode Yi which are display electrodes.
- the first sustain pulses 65 and 75 are applied to the sustain electrodes Xi and the scan electrodes Yi, and then the sustain pulses 66, 67, 68, 76, 77, and 78 are repeatedly applied to the sustain electrodes Xi and the scan electrodes Yi.
- the discharge cell Cij that is applied and selected by the address discharge, the sustain discharge continues and an image is displayed on the plasma display panel 10.
- one subfield includes a reset period Tr, an address period Ta, and a sustain period Ts.
- the plasma display device according to the present embodiment is configured to reduce power during the address period Ta, and performs control for realizing such power reduction during the address period Ta.
- FIG. 4 is a diagram illustrating the configuration of the address driving circuit 20 of the plasma display apparatus according to the first embodiment.
- the address drive circuit 20 of the plasma display device according to the present embodiment includes an address driver 21 and a power recovery circuit 25.
- the address drive circuit 20 of the plasma display apparatus according to the present embodiment includes a plurality of address drivers 21, and one address driver 21 is shown in FIG. 4.
- the address driver 21 includes an address pulse output circuit 22 for each of the address electrodes A1, A2,... Aj, Aj + 1.
- the address pulse output circuit 22 may have the same configuration unless otherwise specified. For example, in the case of the plasma display panel 10 having 1920 pixels in the horizontal direction, one pixel is formed by cells of three colors of red, green, and blue, so that a total of 5760 address pulse output circuits 22 are provided. This is divided by a plurality of address drivers 21 and provided to each address driver 21. For example, several hundreds of address pulse output circuits 22 are accommodated in one integrated circuit (IC), and a plurality of address pulse output circuits 22 are provided in the address drive circuit 20 as address drivers 21. For example, when the address driver 21 having 192 outputs is used for the 1920 pixel plasma display panel 10, the entire address drive circuit 20 is configured by 30 address drivers 21.
- the address driver 21 includes a power supply voltage supply terminal VDH, a charge share terminal CS, and individual output terminals OUTj corresponding to the address electrodes Aj.
- the power supply voltage supply terminal VDH and the charge share terminal CS are provided in common one by one for each address driver 21, and a plurality of output terminals OUTj are provided for each address electrode Aj. It is done.
- Each output terminal OUTj is connected with a corresponding address electrode Aj, and constitutes a capacitive load Cp.
- the address pulse output circuit 22 is a charge share switch SW1, a high voltage clamping switching element SW2 for supplying a high level potential to the address electrode Aj, and a low level potential for supplying to the address electrode Aj. It has a low voltage clamp switching element SW3, a clamp switching element level shift circuit 23, and a charge share switch level shift circuit 24.
- the charge sharing switch SW1 is a switch for averaging and sharing the charge remaining in the address electrode Aj with respect to each address pulse output circuit 22 in the address driver 21.
- the individual charge share switches SW1 in the individual address pulse output circuits 22 are all connected in parallel to the charge share terminal CS.
- the charge share switch SW1 operates to be used for charging the address pulse generation for the next (i + 1) -th scan electrode Yi + 1. .
- the ratio of the light emitting cell Cij to the non-light emitting cell Cij is substantially 1: 1 and close to the same, when address discharge is performed on the scan electrode Yi in the i-th row, the address electrodes A1, A2,.
- Aj and Aj + 1 are states in which the address electrode Aj that outputs the address pulse and the address electrode Aj that does not output the address pulse are mixed, and the average of the entire address electrode Aj is about 1 ⁇ 2 of the total capacitance. It is considered to have a charge. Therefore, at the timing when the address pulse applied voltage is discharged after the address discharge is performed on the i-th scan electrode Yi, the charge share switch SW1 is connected and short-circuited, and the next (i + 1) -th row is short-circuited. If it is used for the charge for generating the address pulse for the scan electrode Yi + 1, the voltage rise to about half of the address voltage Va can be performed by the charge share charge, and the charge generated by the previous address pulse generation is effectively utilized. can do.
- the power recovery circuit is connected to the charge share terminal CS in order to reduce power consumption even when the ratio of the light emitting cells to the non-light emitting cells is biased. 25 is connected.
- the power recovery circuit 25 includes an inductor L and a capacitor Cr, and includes an LC series circuit in which these are connected in series.
- the voltage of the capacitor Cr is maintained at Va / 2, which is substantially half of the voltage Va of the address pulse, and power recovery is performed or not performed due to a potential difference between this voltage and the charge share terminal CS.
- Va / 2 which is substantially half of the voltage Va of the address pulse
- power recovery is performed or not performed due to a potential difference between this voltage and the charge share terminal CS.
- an LC series circuit composed of an inductor L and a capacitor Cr connected in series is configured, and the power recovery circuit 25 including this is connected to the charge share terminal CS, and the power recovery circuit 25 is connected by the charge share switch SW1.
- the power recovery circuit 25 is provided outside the address driver 21, but may be configured inside the address driver 21.
- the address driver 21 is configured to save space, and the power recovery circuit 25 is provided with the address driver 21 so that a large capacity element can be applied to the inductor L and the capacitor Cr of the power recovery circuit 25.
- the power recovery circuit 25 may be configured in the address driver 21 according to the application.
- the charge sharing switch SW1 may be a semiconductor switching element such as a MOS (metal Oxide Semiconductor) transistor, a bipolar transistor, or an IGBT (Insulated Gate Bipolar Transistor), or another switching element such as a relay. May be.
- MOS metal Oxide Semiconductor
- bipolar transistor a bipolar transistor
- IGBT Insulated Gate Bipolar Transistor
- the high-voltage clamping switching element SW2 is a switching means for clamping the address electrode Aj to the power supply voltage Va supplied from the power supply terminal VDH and supplying a high-level potential to the address electrode Aj.
- the low voltage clamp switching element SW3 is a switching means for connecting the address electrode Aj to the circuit ground and clamping it to the ground voltage 0 [V], and supplying a low level potential to the address electrode Aj.
- the high voltage clamping switching element SW2 and the low voltage clamping switching element SW3 constitute an output stage of the address driver 21.
- the high voltage clamping switching element SW2 and the low voltage clamping switching element SW3 are shown as bipolar transistors in FIG. 4, but may be other semiconductor switching elements such as MOS transistors and IGBTs. Other types of switching means such as a relay may be used.
- the level shift circuit 23 for the clamp switching element is an adjustment circuit for supplying a voltage or a current to the gate or the base in order to properly operate the high voltage clamp switching element SW2 and the low voltage clamp switching element SW3. Since the plasma display device is operated at a high voltage of around 100 [V] or higher, high voltage elements are also used as the high voltage clamping switching element SW2 and the low voltage clamping switching element SW3. Since these high voltage elements have a high driving voltage, the clamp switching element level shift circuit 23 is provided to adjust the gate operation and the like.
- the charge share switch level shift circuit 24 is a circuit provided for adjustment to appropriately operate the charge share switch SW1, and has a function similar to that of the clamp switching element level shift circuit 23.
- FIG. 5 is a diagram obtained by simplifying FIG. 4 and extracting the address pulse output circuit 22 and the power recovery circuit 25 for one bit.
- the high-voltage clamping switching element SW2 and the low-voltage clamping switching element SW3 are also simply shown as switches SW2 and SW3 by switch symbols.
- the designation is simplified, and the high voltage clamping switching element SW2 is referred to as a switch SW2, and the low voltage clamping switching element SW3 is referred to as a switch SW3.
- the level shift circuits 23 and 24 are omitted in FIG.
- the on-time control circuit in the control drive circuit 50 is shown in FIG.
- FIG. 6 is a diagram showing an example of the waveform of the address pulse applied to the address electrode Aj.
- FIG. 6A is a diagram showing an example of a voltage waveform showing the rising and falling states of the address pulse.
- FIG. 6B is a diagram showing an example of a voltage waveform when the address pulse falls.
- the address electrode Aj is connected to the power recovery circuit 25.
- the switch SW2 is turned off and the charge sharing switch SW1 is turned on
- the address electrode Aj is connected to the power recovery circuit 25.
- the operation of charge sharing and power recovery starts at time t1, and the voltage applied to the address electrode Aj decreases due to LC resonance.
- FIG. 6 shows a case where the switch SW1 is turned off at time t2 and a case where the switch SW1 is turned off at time t3, corresponding to two LC resonance waveforms.
- the ON time during which the switch SW1 is turned on and the address electrode Aj and the power recovery circuit 25 are connected can be made variable according to the LC resonance waveform.
- the on-time of the charge sharing switch SW1 may be set by, for example, the on-time control circuit 54 provided in the drive control circuit 50.
- the on-time control circuit 54 is control means for controlling the time during which the switch SW1 is kept on.
- the on-time control means 54 compares the display data of the scan electrode that has been scanned with the scan electrode that is to be scanned next, and the high level potential and the low level potential of the output stage are switched. When the ratio is large, control is performed so that the ON time of the switch SW1 is lengthened, and when the ratio of switching is small, control is performed so that the ON time of the switch SW1 is shortened. That is, according to the amount of charge movement, the switch SW1 is controlled to be long when the amount of charge movement is large, and is controlled to be short when the amount of charge movement is small.
- FIG. 6B is a diagram showing an example of the voltage waveform of the fall due to the LC resonance of the address pulse.
- the ON time of the switch SW1 is set to be long, after the LC resonance starts to oscillate and reaches the minimum voltage V1, the voltage rises and becomes the voltage V3.
- the voltage V3 slightly increased from the minimum voltage V1 is clamped to a low level potential. Doing so reduces efficiency.
- the time for turning off the switch SW1 is preferably the timing at which the LC resonance becomes the minimum voltage V1.
- the on-time control circuit 54 changes so that the on-time of the switch SW1 is optimized in accordance with the switching switching ratio of the supply potential of the address pulse so as not to be in the broken line state shown in FIG. To control.
- the switch SW1 After the switch SW1 is turned off at time t2 or t3, the switch SW3 is turned on, and a low level potential is supplied to the address electrode Aj to clamp the address electrode Aj to the low level potential.
- the low level potential may be, for example, the ground potential 0 [V]. Even if the ratio of lighting and non-lighting of the display data is not uniform and biased to either one, the power recovery circuit 25 recovers the power until the potential of the address electrode Aj drops from Va to the intermediate potential V1. Done and then clamped to a low level, so power consumption can be reduced.
- the switch SW1 when switching the address pulse to a high level potential, the switch SW1 is first switched from OFF to ON. As a result, the power stored in the capacitor Cr of the power recovery circuit 25 is applied to the address electrode Aj. At this time, the charge moves to the address electrode Aj by LC resonance between the inductor L of the power recovery circuit 25 and the capacitive load Cp of the address electrode Aj. In FIG. 6, the switch SW1 is turned on from time t4 to t5, and the potential of the address electrode Aj rises due to LC resonance.
- the switch SW1 is turned off, then the switch SW2 is turned on, and a high level potential is supplied from the output stage to the address electrode Aj, thereby clamping the address electrode Aj to the high level voltage Va.
- the switch SW1 is turned off at the timing when the increase in the potential of the address electrode Aj due to LC resonance reaches the maximum potential V2, and the recovered power is the most. It is preferable to perform control that allows efficient use.
- the specific control contents of the on-time control circuit 54 are the same as the description contents in FIG.
- FIG. 7 is a diagram illustrating an example of the configuration of the address driver 21 of the plasma display apparatus according to the first embodiment.
- FIG. 7 shows an address driver 21 having an address pulse output circuit 22 corresponding to 3 bits corresponding to the address electrodes A1 to A3.
- the address driver 21 includes a larger number of address pulse output circuits 22. In FIG. 7, only the address pulse output circuit 22 for 3 bits is shown as an example.
- the address driver 21 includes switches SW2 and SW3 constituting an output stage and a charge sharing switch SW1.
- the switches SW2 and SW3 at the output stage of the address driver 21 are composed of MOS transistors.
- the switch SW1 may be composed of a MOS transistor, or may be composed of other switch means.
- a power recovery circuit 25 is connected to the charge share terminal CS of the address driver.
- an on-time control circuit 54 for controlling the on-time of the switch SW1 is provided outside the address driver 21.
- the switch SW1 is turned off, and the address electrode Aj and the power recovery circuit 25 are disconnected.
- the on-time length of the switch SW1, that is, the timing at which the switch SW1 is turned off may be controlled by the on-time control circuit 54, and as described above, switching between the high level and low level potentials of the output stage. Control may be performed according to the switching ratio. In this case, since the three output stages are all switched on and off, the on-time may be set longer.
- the on-time of the switch SW1 may be controlled by the on-time control circuit 54.
- FIG. 8 is a diagram showing an example of switching timing of the address driver 21 shown in FIG.
- the switch SW1 When switching the potential of the address electrodes Aj from the high level to the low level, when to turn on the switch SW1 is first in time t1, it begins to flow current I L of the inductor L at time t2 a little later. Before the as possible electric current I L flowing through the inductor L, switching off the switch SW1 at time t3, then when turned on immediately switch SW2, to turn on the switch SW2 at a timing completely flowed current I L Therefore, switching can be performed at the timing at which the power can be reduced most.
- the on-time control circuit 54 controls the on-time of the switch SW1 so as to have such timing.
- the power recovery circuit 25 can be used to increase the power efficiency.
- the power recovery circuit 25 is not substantially used, and the power recovery circuit 25 can be used according to the balance between light emission and non-light emission. For any display pattern, Power efficiency can be increased.
- the on-time control circuit 54 has been described by way of an example provided in the drive control circuit 50, but may be provided in a logic circuit provided in the address driver 21, for example.
- the logic circuit in the address driver 21 receives the R, G, B pixel data of the three primary colors of light converted by the image signal processing LSI as serial data, converts it into parallel data, and returns it to the image data. Display data may be detected at this stage.
- FIG. 9 is a diagram illustrating an example in which the power recovery circuit 25 is arranged corresponding to each address driver 21.
- each address driver 21 drives a multi-bit address electrode Aj.
- a plurality of address electrodes Aj are collectively shown as one address electrode group AG as address electrode groups AG1, AG2, AG3.
- a power recovery circuit 25 is installed in a one-to-one correspondence.
- the power recovery circuits 25 and the address drivers 21 are connected in parallel.
- one power recovery circuit 25 may be provided corresponding to each address driver 21 and connected in parallel.
- the effect of power recovery can be reliably exhibited at a position near each address driver 21 and the uniformity of the entire address drive circuit 20 can be provided.
- FIG. 10 is a diagram showing an example of an installation method of the power recovery circuit 25 different from FIG. 10, the power recovery circuit 25 is the same as the installation method according to FIG. 9 in that the power recovery circuit 25 is provided on a one-to-one basis corresponding to each address driver 21, but in FIG. 25 is not connected.
- power recovery corresponding to each address driver 21 can be performed completely, and the capability of each power recovery circuit 25 can be effectively exhibited without the influence of connection resistance or the like, and power loss during power recovery can be achieved. Can also be reduced.
- the power recovery circuit 25 may be installed so as to completely correspond to each address driver 21 including the electrical connection.
- FIG. 11 is a diagram showing an example of an installation method of the power recovery circuit 25 different from FIGS. 9 and 10.
- the charge sharing terminals CS of each address driver 21 are connected in parallel, and one power recovery circuit 25 is installed in the plurality of address drivers 21.
- one power recovery circuit 25 may be provided for a plurality of address drivers 21 instead of individually. If the power recovery circuit 25 has a sufficiently large capacity, such a configuration may be adopted. Thus, charges can be distributed by charge sharing for a large number of address electrodes Aj, and a wide range of display pattern imbalances can be dealt with.
- the power recovery circuit 25 may be provided with one power recovery circuit 25 in common for the entire horizontal direction of the address driver 21.
- the address recovery circuit 21 is divided into about 2 to 20 small groups, One power recovery circuit 25 may be provided for each group.
- the number of installed power recovery circuits 25 can be various in relation to the address driver 21. Further, the power recovery circuit 25 is preferably provided in the address drive circuit 20, but is not limited to this, and the power recovery circuit 25 is provided at any position as long as the wiring with the address driver 21 can be appropriately performed. Also good.
- FIG. 12 is a diagram showing a schematic configuration of the plasma display device according to the second embodiment to which the present invention is applied.
- the plasma display device according to the second embodiment is the same as the plasma display device according to the first embodiment except that the on-time control circuit 54 is not required from the plasma display device according to the first embodiment shown in FIG. It is the same.
- the panel configuration is also the same as that of the plasma display panel 10 according to FIG. Further, the configuration of one subfield is the same as the subfield configuration according to FIG. 3 of the first embodiment, and thus the description of these points is omitted.
- the plasma display device according to the second embodiment is different from the plasma display device according to the first embodiment in that two switches SW11 and SW12 for charge sharing of the address pulse output circuit 22a are provided, and the power recovery circuit 25a
- the difference is that two inductors L1 and L2 are provided, and that diodes D1 and D2 are inserted and connected between the switch SW11 and the inductor L1 and between the switch SW12 and the inductor L2.
- the point that the on-time control circuit 54 is eliminated is different from the plasma display device according to FIG. 5 of the first embodiment.
- an address pulse output circuit 22a provided in the address driver 21a is provided for each bit corresponding to the address electrode Aj.
- the output stage in the address pulse output circuit 22a includes a switch SW2 for supplying a high level potential to the address electrode Aj and a switch SW3 for supplying a low level potential to the address electrode Aj. This is the same as the address pulse output circuit 22.
- one end of the first switch SW11 and one end of the second switch SW12 are connected in parallel to the address electrode Aj.
- the first switch SW11 is provided in the first branch path B1 in the address driver 21a
- the second switch SW12 is provided in the second branch path B2 in the address driver 21a.
- the other end of the first switch SW11 is connected to the cathode side of the first diode D1.
- the anode side of the first diode is connected to the first inductor L1.
- the first inductor L1 is connected to a power recovery capacitor Cr.
- the other end of the second switch SW12 connected to the address electrode Aj is connected to the anode side of the second diode D2, and the cathode side of the second diode S2 is connected to the second inductor.
- the second inductor L2 is connected to a power recovery capacitor Cr.
- the first inductor L1 and the second inductor L2 are connected in parallel to the capacitor Cr.
- the first branch path B1 including the first switch SW11 and the second branch path B2 including the second switch SW12 are provided in the address driver 21a.
- the path of the rising and falling currents at the time of address pulse output is different. That is, at the rising edge of the address pulse, a voltage is supplied by LC resonance from the power recovery capacitor Cr to the address electrode Aj via the first inductor L1, the first diode D1, and the first switch SW11. Similarly, when the address pulse falls, the charge remaining in the address electrode Aj is recovered in the capacitor Cr via the second switch SW12, the second diode D2, and the second inductor L2.
- the path between the power recovery circuit 25a and the address electrode Aj is divided into the first branch path B1 and the second branch path B2 to prevent backflow.
- the first diode D1 and the second diode D2 in the first branch path B1 and the second branch path B2, respectively, it is possible to prevent the occurrence of vibration due to LC resonance.
- the on-time of the charge share switch SW1 is appropriately set according to the switching switching ratio between the high level potential and the low level potential.
- the second switch SW12 is turned off, the switch SW3 on the low level potential supply side of the output stage is turned on, and the address electrode Aj is clamped to the ground potential of the low level voltage.
- the timing at which the second switch SW12 is turned off may be matched with the maximum load time.
- FIG. 13 is a diagram for explaining a method of setting the ON time of the second switch SW12.
- FIG. 13 shows an example of a voltage waveform when the address pulse falls.
- the ON time of the second switch SW12 is set to a length of time that can be handled in the case of the maximum load, the voltage waveform without vibration shown by the solid line in FIG. 13 is obtained in all display patterns. be able to.
- the on-time control described in the first embodiment can be eliminated, and the power can be reduced while the plasma display device is simply configured.
- the timing for turning off the first switch SW11 at this time may be set by setting the on-time of the first switch SW11 in accordance with the maximum load. In particular, it is not necessary to perform control to change the on-time according to the display pattern. This is because the current can be prevented from flowing from the address electrode Aj side toward the first inductor L1 due to the vibration of the LC resonance by the first diode D1 for preventing backflow even at the rising edge of the address pulse.
- the switch SW2 is turned on to supply the high level voltage Va to the address electrode Aj, whereby the potential of the address electrode Aj is clamped to the high level voltage Va. Thereafter, the address discharge can be performed by the same process while improving the power efficiency.
- the first inductor L1 and the second inductor L2 of the power recovery circuit 25a may use inductors L1 and L2 having the same characteristics, or inductors L1 and L2 having different characteristics. Also good. For example, there are cases where it is desired to shorten the rise time of the address pulse and increase the rise time. That is, if the address pulse has a short fall time and a steep waveform, the application of the address pulse may change the scan pulse or the like when the next address pulse is applied. In such a case, the inductance of the second inductor L2 connected to the second path B2 for falling is increased so that the falling time of the address pulse becomes long, and the first path for rising is increased.
- the inductance of the first inductor L1 connected to B1 may be set to a normal magnitude.
- the rise time and the fall characteristic of the LC resonance may be made different to prevent backflow.
- the first switch SW11 and the first inductor L1 and the second switch SW12 and the second diode D2 are not provided.
- the inductors L2 may be directly connected to each other.
- a first diode D1 is inserted and connected between the first switch SW11 and the first inductor L1, and a second switch is connected between the second switch SW12 and the second inductor L2.
- the diode D2 is inserted and connected has been described, the positions of the first switch SW11 and the first diode D1 and the positions of the second switch SW12 and the second diode SW12 may be reversed. Good.
- one each of the first diode D1 and the second diode D2 is provided in the 1-bit address pulse output circuit 22a, but this is provided in one address pulse output circuit 22a. You may make it provide in common. Thereby, space saving and cost reduction of the address driver 21a can be achieved.
- FIG. 14 is a diagram showing an example in which a plurality of 1-bit address pulse output circuits 22a shown in FIG. 12 are provided in the address driver 22a.
- an address pulse output circuit 22a for driving the address electrodes A1 to A3 is provided for 3 bits in the address driver 21a.
- the actual address driver 21a is provided with several hundred address pulse output circuits 22a.
- FIG. 14 shows an address pulse output circuit 22a for 3 bits.
- Each address pulse output circuit 22a includes an output stage including a switch SW2 and a switch SW3, and includes a first branch path B1 and a second branch path B2 connected in parallel to the address electrode Aj.
- the first branch path B1 includes a first switch SW11 for switching connection / disconnection between the address electrode Aj and the power recovery circuit 25a, and a first diode D1 having a cathode on the address electrode Aj side.
- the second branch B2 is provided with a second switch SW11 for switching connection / disconnection between the address electrode Aj and the power recovery circuit 25a, and a first diode whose anode is on the address electrode Aj side. ing.
- the anode of the first diode D1 of each address pulse output circuit 22a is connected in parallel to the charge share rising terminal CSU.
- the cathode of the second diode D2 of each address pulse output circuit 22a is connected in parallel to the charge share falling terminal CSD.
- the first inductor L1 is connected to the charge share rising terminal CSU
- the second inductor L2 is connected to the charge share falling terminal CSD
- the first inductor L1 and the second inductor L2 are connected.
- the inductor L2 is commonly connected in parallel to the power recovery capacitor Cr.
- the address pulse output circuit 22a provided for each bit in the address driver 21a is transferred to the power recovery circuit 25a provided outside the address driver 21a through the path for rising and falling of the address pulse.
- the on-time control circuit 54 it is not necessary to control the complicated on-time of the first switch SW11 and the second switch SW12, and the power efficiency is simplified while simplifying the design. Can be achieved.
- the diodes D1 and D2 are provided in the address pulse output circuit 22a for each bit.
- the diodes D1 and D2 are connected to the charge share rising terminal CSU and the charge share.
- a configuration may be adopted in which one piece is provided in common in the vicinity of the falling terminal CSD. Since the number of diodes D1 and D2 can be greatly reduced, cost reduction can be achieved.
- the diodes D1 and D2 may be provided outside the address driver 21a and configured as a part of the power recovery circuit 25a. Further, the point that the power recovery circuit 25a can be incorporated in the address driver 21a is the same as the description in the first embodiment, and the switches in the first branch path B1 and the second branch path B2 are the same.
- the arrangement of SW11, SW12 and diodes D1, D2 can be changed as described with reference to FIG.
- FIG. 15 is a diagram illustrating an example of a voltage waveform of an address pulse of the plasma display device according to the second embodiment.
- FIG. 15A is a diagram showing an example of a voltage waveform when the rising edge and the falling edge of the address pulse have the same phase.
- FIG. 15A an example of the voltage waveform of the address pulse applied to the address electrodes Aj and Aj + 1 of adjacent bits is shown with both falling and rising waveforms superimposed.
- the address electrode Aj that applies the rising waveform and the address electrode Aj that applies the falling waveform at the rising and falling times. are connected simultaneously and charge sharing is performed for twice the capacity.
- FIG. 15B is a diagram showing a voltage waveform when the phase at the rising edge and the falling edge of the address pulse is made different.
- FIG. 15B by shifting the phase at the time of rising and falling of the address pulse, it is possible to separately connect the address electrode Aj at the timing of rising and the timing of falling to the power recovery circuit 25a. It becomes.
- the charge sharing is performed separately for the address electrode Aj to which the rising pulse is applied and the address electrode Aj to which the falling pulse is applied, and the capacity of the address electrode Aj that is the charge sharing target can be reduced. The power efficiency can be further improved.
- each address driver 21a is provided with two terminals, that is, a charge share rising terminal CSU and a charge share falling terminal CSD, and each includes a first inductor L1 and a second inductor L2 of the power recovery circuit 25a. As the number of power recovery circuits 25a increases, the first inductor L1 and the second inductor L2 of the power recovery circuit 25a may be connected for each line.
- Example 1 The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. It is also possible to combine Example 1 and Example 2.
- the present invention is applicable to a plasma display device that displays an image on a plasma display panel.
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Abstract
Description
前記アドレス電極を駆動するアドレスドライバと、
インダクタとコンデンサを含む電力回収回路と、
前記アドレスドライバ内に備えられ、前記アドレス電極と前記電力回収回路との接続と非接続を切り換えるスイッチと、を有することを特徴とする。
前記アドレスドライバは、前記スイッチを前記アドレス電極に対応して複数備え、
前記電力回収回路は、前記アドレスドライバの外部に設けられ、
前記電力回収回路に複数の前記スイッチが並列接続されていることを特徴とする。
前記アドレスドライバは、ハイレベル又はローレベルの電位を前記アドレス電極に供給するアドレスドライバ出力段を含み、
該アドレスドライバ出力段の前記ハイレベルの電位と前記ローレベルの電位の切換比率に応じて、前記スイッチのオン時間を制御する制御手段を備えたことを特徴とする。
前記制御手段は、前記オン時間を、前記アドレスドライバ出力段の前記ハイレベルの電位と前記ローレベルの電位の前記切換比率が小さいときには短くし、前記切換比率が大きいときには長くすることを特徴とする。
前記電力回収回路は、前記アドレスドライバ毎に対応して設けられたことを特徴とする。
前記電力回収回路は、複数の前記アドレスドライバに共通して設けられたことを特徴とする。
前記スイッチは、1つの前記アドレス電極に並列に接続された第1のスイッチと第2のスイッチとを有し、
前記電力回収回路は、並列に接続された第1のインダクタと第2のインダクタとコンデンサとを有し、
前記第1のスイッチと前記第1のインダクタ同士及び前記第2のスイッチと前記第2のインダクタ同士が電気的に接続されたことを特徴とする。
前記アドレスドライバは、前記第1のスイッチを含む第1の分岐路と、前記第2のスイッチを含む第2の分岐路とを有し、
前記第1の分岐路内に、前記アドレス電極側がカソードで、前記第1のインダクタ側がアノードとなるように挿入接続された第1のダイオードと、前記第2の分岐路内に、前記アドレス電極側がアノードで、前記第2のインダクタ側がカソードとなるように挿入接続された第2のダイオードと、を有することを特徴とする。
前記アドレスドライバは、ハイレベル又はローレベルの電位を前記アドレス電極に供給するアドレスドライバ出力段を含み、
前記第1のスイッチは、前記アドレスドライバ出力段が前記アドレス電極への出力を前記ローレベルから前記ハイレベルの電位に切り換える前にオンとされ、
前記第2のスイッチは、前記アドレスドライバ出力段が前記アドレス電極への出力を前記ハイレベルから前記ローレベルに切り換える前にオンとされることを特徴とする。
前記第1のスイッチがオンとされるタイミングと、前記第2のスイッチがオンとされるタイミングは異なることを特徴とする。
前記アドレスドライバは、前記第1の分岐路と前記第2の分岐路の組を前記アドレス電極に対応して複数備え、
前記電力回収回路は、前記アドレスドライバの外部に設けられ、
複数の前記第1の分岐路は、前記電力回収回路の前記第1のインダクタに並列接続され、複数の前記第2の分岐路は、前記電力回収回路の前記第2のインダクタに並列接続されていることを特徴とする。
前記電力回収回路は、前記アドレスドライバ毎に対応して設けられていることを特徴とする。
前記電力回収回路は、複数の前記アドレスドライバに共通して設けられたことを特徴とする。
前記アドレス電極にアドレスパルスを印加して駆動するアドレスドライバと、
該アドレスドライバに備えられ、前記複数のアドレス電極の各々に残存する電荷を平均化した電圧を印加するための、一端が前記アドレス電極に接続され、他端が共通接続されたチャージシェア用のスイッチと、
前記スイッチの共通接続された前記他端に接続され、前記平均化した電圧が前記アドレスパルスの略半分の電圧と差がある場合に、前記電荷をLC共振により回収する電力回収回路と、を有することを特徴とする。
前記スイッチは、前記アドレス電極に並列に接続された第1のスイッチと第2のスイッチとを有し、
前記電力回収回路は、コンデンサに並列に接続された第1のインダクタと第2のインダクタとコンデンサとを有し、
前記第1のスイッチと前記第1のインダクタ同士及び前記第2のスイッチと前記第2のインダクタ同士が電気的に接続されたことを特徴とする。
前記アドレスドライバは、前記第1のスイッチを含む第1の分岐路と、前記第のスイッチを含む第2の分岐路とを有し、
前記第1の分岐路内には、アノードが前記第1のインダクタ側であり、カソードが前記アドレス電極側である第1のダイオードが挿入接続され、
前記第2の分岐路内には、カソードが前記第2のインダクタ側であり、アノードが前記アドレス電極側である第2のダイオードが挿入接続されていることを特徴とする。
11 前面基板
12 前面ガラス基板
13、17 誘電体層
14 保護膜
15 背面基板
16 背面ガラス基板
18 隔壁
19、19R、19G、19B 蛍光体
20 アドレス駆動回路
21、21a アドレスドライバ
22、22a アドレスパルス出力回路
23、24 レベルシフト回路
25、25a 電力回収回路
30 維持駆動回路
40 走査駆動回路
41 スキャン回路
42 サステイン回路
43 リセット回路
50 駆動制御回路
51 サブフィールド変換回路
52 アドレスデータ発生回路
53 スキャンデータ発生回路
54 オン時間制御回路
SW1、SW11、SW12、SW2、SW3 スイッチ
Aj アドレス電極
Claims (16)
- 第1の方向に延在する複数の走査電極と、該走査電極に交わるように第2の方向に延在する複数のアドレス電極とを含むプラズマディスプレイパネルと、
前記アドレス電極を駆動するアドレスドライバと、
インダクタとコンデンサを含む電力回収回路と、
前記アドレスドライバ内に備えられ、前記アドレス電極と前記電力回収回路との接続と非接続を切り換えるスイッチと、を有することを特徴とするプラズマディスプレイ装置。 - 前記アドレスドライバは、前記スイッチを前記アドレス電極に対応して複数備え、
前記電力回収回路は、前記アドレスドライバの外部に設けられ、
前記電力回収回路に複数の前記スイッチが並列接続されていることを特徴とする請求項1に記載のプラズマディスレプレイ装置。 - 前記アドレスドライバは、ハイレベル又はローレベルの電位を前記アドレス電極に供給するアドレスドライバ出力段を含み、
該アドレスドライバ出力段の前記ハイレベルの電位と前記ローレベルの電位の切換比率に応じて、前記スイッチのオン時間を制御する制御手段を備えたことを特徴とする請求項2に記載のプラズマディスプレイ装置。 - 前記制御手段は、前記オン時間を、前記アドレスドライバ出力段の前記ハイレベルの電位と前記ローレベルの電位の前記切換比率が小さいときには短くし、前記切換比率が大きいときには長くすることを特徴とする請求項3に記載のプラズマディスプレイ装置。
- 前記電力回収回路は、前記アドレスドライバ毎に対応して設けられたことを特徴とする請求項4に記載のプラズマディスレプレイ装置。
- 前記電力回収回路は、複数の前記アドレスドライバに共通して設けられたことを特徴とする請求項4に記載のプラズマディスプレイ装置。
- 前記スイッチは、1つの前記アドレス電極に並列に接続された第1のスイッチと第2のスイッチとを有し、
前記電力回収回路は、並列に接続された第1のインダクタと第2のインダクタとコンデンサとを有し、
前記第1のスイッチと前記第1のインダクタ同士及び前記第2のスイッチと前記第2のインダクタ同士が電気的に接続されたことを特徴とする請求項1に記載のプラズマディスプレイ装置。 - 前記アドレスドライバは、前記第1のスイッチを含む第1の分岐路と、前記第2のスイッチを含む第2の分岐路とを有し、
前記第1の分岐路内に、前記アドレス電極側がカソードで、前記第1のインダクタ側がアノードとなるように挿入接続された第1のダイオードと、前記第2の分岐路内に、前記アドレス電極側がアノードで、前記第2のインダクタ側がカソードとなるように挿入接続された第2のダイオードと、を有することを特徴とする請求項7に記載のプラズマディスプレイ装置。 - 前記アドレスドライバは、ハイレベル又はローレベルの電位を前記アドレス電極に供給するアドレスドライバ出力段を含み、
前記第1のスイッチは、前記アドレスドライバ出力段が前記アドレス電極への出力を前記ローレベルから前記ハイレベルの電位に切り換える前にオンとされ、
前記第2のスイッチは、前記アドレスドライバ出力段が前記アドレス電極への出力を前記ハイレベルから前記ローレベルに切り換える前にオンとされることを特徴とする請求項8に記載のプラズマディスプレイ装置。 - 前記第1のスイッチがオンとされるタイミングと、前記第2のスイッチがオンとされるタイミングは異なることを特徴とする請求項9に記載のプラズマディスプレイ装置。
- 前記アドレスドライバは、前記第1の分岐路と前記第2の分岐路の組を前記アドレス電極に対応して複数備え、
前記電力回収回路は、前記アドレスドライバの外部に設けられ、
複数の前記第1の分岐路は、前記電力回収回路の前記第1のインダクタに並列接続され、複数の前記第2の分岐路は、前記電力回収回路の前記第2のインダクタに並列接続されていることを特徴とする請求項10に記載のプラズマディスレプレイ装置。 - 前記電力回収回路は、前記アドレスドライバ毎に対応して設けられていることを特徴とする請求項11に記載のプラズマディスレプレイ装置。
- 前記電力回収回路は、複数の前記アドレスドライバに共通して設けられたことを特徴とする請求項11に記載のプラズマディスプレイ装置。
- 第1の方向に延在する複数の走査電極と、該走査電極に交わるように第2の方向に延在する複数のアドレス電極とを含むプラズマディスプレイパネルと、
前記アドレス電極にアドレスパルスを印加して駆動するアドレスドライバと、
該アドレスドライバに備えられ、前記複数のアドレス電極の各々に残存する電荷を平均化した電圧を印加するための、一端が前記アドレス電極に接続され、他端が共通接続されたチャージシェア用のスイッチと、
前記スイッチの共通接続された前記他端に接続され、前記平均化した電圧が前記アドレスパルスの略半分の電圧と差がある場合に、前記電荷をLC共振により回収する電力回収回路と、を有することを特徴とするプラズマディスプレイ装置。 - 前記スイッチは、前記アドレス電極に並列に接続された第1のスイッチと第2のスイッチとを有し、
前記電力回収回路は、並列に接続された第1のインダクタと第2のインダクタとコンデンサとを有し、
前記第1のスイッチと前記第1のインダクタ同士及び前記第2のスイッチと前記第2のインダクタ同士が電気的に接続されたことを特徴とする請求項14に記載のプラズマディスプレイ装置。 - 前記アドレスドライバは、前記第1のスイッチを含む第1の分岐路と、前記第のスイッチを含む第2の分岐路とを有し、
前記第1のスイッチを含む第1の分岐路内には、アノードが前記第1のインダクタ側であり、カソードが前記アドレス電極側である第1のダイオードが挿入接続され、
前記第2のスイッチを含む第2の分岐路内には、カソードが前記第2のインダクタ側であり、アノードが前記アドレス電極側である第2のダイオードが挿入接続されていることを特徴とする請求項15に記載のプラズマディスプレイ装置。
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KR100751314B1 (ko) * | 2003-10-14 | 2007-08-22 | 삼성에스디아이 주식회사 | 어드레싱 전력을 최소화한 방전 디스플레이 장치 및 그구동 방법 |
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