EP1936591A1 - Plasmaanzeigevorrichtung und Ansteuerungsverfahren dafür - Google Patents

Plasmaanzeigevorrichtung und Ansteuerungsverfahren dafür Download PDF

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Publication number
EP1936591A1
EP1936591A1 EP06292000A EP06292000A EP1936591A1 EP 1936591 A1 EP1936591 A1 EP 1936591A1 EP 06292000 A EP06292000 A EP 06292000A EP 06292000 A EP06292000 A EP 06292000A EP 1936591 A1 EP1936591 A1 EP 1936591A1
Authority
EP
European Patent Office
Prior art keywords
sustain
electrode
electrodes
time
scan
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06292000A
Other languages
English (en)
French (fr)
Inventor
Dongki Paik
Jongrae Lim
Tae Heon Kim
Wootae Kim
Sung Chun Choi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Priority to EP06292000A priority Critical patent/EP1936591A1/de
Publication of EP1936591A1 publication Critical patent/EP1936591A1/de
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
    • G09G3/292—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for reset discharge, priming discharge or erase discharge occurring in a phase other than addressing
    • G09G3/2927—Details of initialising
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2211/00—Plasma display panels with alternate current induction of the discharge, e.g. AC-PDPs
    • H01J2211/20—Constructional details
    • H01J2211/22—Electrodes
    • H01J2211/32—Disposition of the electrodes
    • H01J2211/323—Mutual disposition of electrodes

Definitions

  • the present invention relates to plasma display apparatus and driving method thereof.
  • a plasma display panel generally comprises a front panel and a rear panel. Barrier ribs formed between the front panel and the rear panel form discharge cells. Each of the discharge cells is filled with an inert gas containing a main discharge gas such as neon (Ne), helium (He) or a Ne-He gas mixture and a small amount of xenon (Xe).
  • a discharge generated by a high frequency voltage causes the inert gas to emit vacuum ultra violet rays, which in turn excite a phosphor provided between barrier ribs, to thereby implement images. Since the plasma display panel can be manufactured to be thin and light, the plasma display panel has been considered as a next generation display apparatus.
  • FIG. 1 is a view illustrating a structure of a general plasma display panel.
  • the plasma display panel comprises a front panel 100 and a rear panel 110 which are coupled in parallel to be spaced from each other at a given distance therebetween.
  • the front panel 100 comprises a front glass 101 being a display surface on which images are displayed
  • the rear panel 110 comprises a rear glass 111 being a rear surface.
  • Scan electrodes 102 and sustain electrodes 103 are formed in pairs on the front glass 101 to form a plurality of maintenance electrode pairs.
  • a plurality of address electrodes 113 are arranged on the rear glass 111 to intersect the plurality of maintenance electrode pairs.
  • the front panel 100 comprises the scan electrode 102 and the sustain electrode 103, each comprising transparent electrodes (a) made of a transparent indium-tin-oxide (ITO) material and bus electrodes (b) made of a metal material.
  • the scan electrode 102 and the sustain electrode 103 generate a mutual discharge therebetween in one discharge cell and maintain light-emission of the cell.
  • the scan electrode 102 and the sustain electrode 103 are covered with one or more upper dielectric layers 104 for limiting a discharge current and providing insulation between the maintenance electrode pairs.
  • a protective layer 105 with a deposit of MgO is formed on an upper surface of the upper dielectric layer 104 to facilitate discharge conditions.
  • FIG. 2 is a view illustrating a combination of a plasma display panel and a driver.
  • the driver e.g. comprises a data driver 201, a scan driver 202, and a sustain driver 203. These drivers 201, 202, 203 are connected with the plasma display panel 200.
  • FIG. 3 A method of implementing image gray scale at this plasma display apparatus is shown in FIG. 3 .
  • FIG. 3 is a view illustrating a method of implementing image gray scale.
  • a method of implementing gray scale in a plasma display apparatus separates a frame into a number of sub-fields each of which has the different number of light emission, and again separates each sub-field into a reset period RPD for initializing all the cells, an address period APD for selecting the cell to be discharged, and a sustain period SPD for implementing gray scale according to the number of discharges.
  • a frame period (16.67ms) corresponding to 1/60 sec is divided into, e.g., 8 subfields SF1 to SF8 as shown in FIG. 3 , and each of the sub-fields SF1 to SF8 is again divided into a reset period, an address period and a sustain period.
  • each sub-field is the same with respect to each sub-field.
  • image gray scale is represented by adjusting the sustain period of each sub-field, i.e. the number of sustain discharges because sustain periods are varied at each sub-field.
  • Driving waveforms of a sub-field are shown at FIG. 4 in the method of driving a plasma display panel driven according to this image gray scale implementation method.
  • FIG. 4 is a view illustrating driving waveforms according to a driving method of a plasma display panel.
  • the plasma display panel is driven with a sub-field divided into a reset period for initializing all the cells, an address period for selecting cells where a sustain discharge occurs, a sustain period for maintaining the discharge of the selected cells, and an erase period for erasing wall charges within the discharged cells.
  • a falling ramp waveform Ramp-down which falls from a positive voltage being lower than the peak voltage of the rising ramp waveform to a specific voltage level below ground GND level voltage in the set down period after the rising ramp waveform was supplied, causes a weak erase discharge in the cells thereby to sufficiently erase wall charges excessively formed in the scan electrodes.
  • This set down discharge allows wall charges to be evenly distributed within the cells so that an address discharge can occur stably.
  • negative scan pulses are sequentially applied to the scan electrodes, and at the same time positive data pulses synchronized wih the scan pulses are applied to the address electrodes.
  • the voltage difference between the scan pulse and data pulse is added to the wall voltage generated in the reset period, thereby causing an address discharge to occur in the discharge cells applied with the data pulses.
  • the wall charges are generated in the cells selected by the address discharge as many as a discharge can occur when the sustain voltage Vs is applied.
  • a positive voltage Vz is supplied to the sustain electrodes so that unwanted discharges with the scan electrodes do not occur during at least one of the set down period or address period by decreasing the voltage difference between the sustain electrodes and the scan electrodes.
  • sustain pulses Sus are applied alternately to the scan electrodes and sustain electrodes.
  • the wall voltage at the cells selected by the address discharge are added to the sustain pulses, thereby causing sustain discharges.
  • a voltage of an erase ramp waveform Ramp-ers having small pulse width and voltage level is supplied to the sustain electrodes in the erase period after the sustain discharge was completed, thereby erasing the wall charges residing within the discharge cells of the entire screen.
  • positive ions are accumulated on the address electrodes X each having a relatively lower potential difference, as positive (+) sustain pulses sus are alternately applied to the scan electrodes Y and sustain electrodes Z during a sustain period in the plasma display apparatus described above.
  • the positive ions which have greater mass than electrons, make ion bombardments to the phosphors ('114' in FIG. 1 ) of the rear panel on which address electrodes X are provided, which has lessened the life span of the plasma display apparatus.
  • FIG. 5 A negative sustain driving method is illustrated in FIG. 5 , which has been recently developed to reduce the loss of phosphors.
  • FIG. 5 is a view illustrating driving waveforms according to a negative sustain driving method of a plasma display panel.
  • a sustain pulse applied to scan electrodes Y and sustain electrodes Z provided on a front panel 100 during a sustain period is set to have a positive voltage level -Vs, so that electrons are relatively accumulated on a rear panel 110 on which address electrodes X are provided. Accordingly, ion bombardments made to phosphors 114 on the rear panel 110 can be reduced to thereby increase the life span of the plasma display apparatus.
  • the amount of ion bombardments made to a MgO layer 105 deposed on the front panel 100 is increased while positive ions are accumulated on the front panel 100, thereby improving the generation rate of secondary electrons. That is, there has been an advantage in that the life span of the plasma display apparatus can be increased and a discharge firing voltage can be decreased by preventing the loss of phosphors 114 while increasing the amount of generation of secondary electrons.
  • a sustain pulse applied during a sustain period among driving waveforms is shown at FIG. 6 in more detail.
  • FIG. 6 is a view illustrating a negative sustain pulse applied during a sustain period among driving waveforms according to a negative sustain driving method of a plasma display panel.
  • negative sustain pulses are applied alternately to scan electrodes and sustain electrodes during a sustain period.
  • one sustain pulse covers an energy supply time ER UP-Time from the application of a reference voltage GND to the arrival of a sustain voltage -Vs and an energy recovery time ER Down-Time from the sustain voltage -Vs to the return to the reference voltage GND by the recovery of energy.
  • the sustain pulse has a prescribed slope during these energy supply time ER Up-Time and energy recovery time ER Down-Time.
  • the plasma display panel of more than 40 inches has employed the energy supply time ER Up-Time and energy recovery time ER Down-Time having the widths W1, W2, each of which is more than 300ns and less than 500ns.
  • FIG. 7 is a view illustrating discharge regions between electrodes of a plasma display panel.
  • the region where this discharge occurs can be separated into a negative glow zone and a positive column zone, the excitation process vigorously proceeds in the negative glow zone to thereby emit visible light and ultraviolet rays strongly.
  • the negative glow zone has a lower emission efficiency than the positive column zone because most of these visible light and ultraviolet rays generated at the negative glow zone are consumed as heat energy. Therefore, a long gap structure has been used in which a gap between electrodes is set to be distant to be capable of utilizing a positive column zone having high emission efficiency.
  • a discharge firing voltage for occurring a sustain discharge increase according to the long gap structure since the gap between electrodes is set to be distant and thus capacitance becomes small. Therefore, there has existed a problem that it is difficult to lead to a sustain discharge with the sustain pulse shown in FIG. 6 as an example of a sustain pulse.
  • a plasma display apparatus comprises a plasma display panel comprising a plurality of scan electrodes and sustain electrodes, a driver driving the plurality of scan electrodes and sustain electrodes, and a negative sustain pulse controller controlling the driver and adjusting each of an energy supply time ER Up-Time and an energy recovery time ER Down-Time of a negative sustain pulse supplied to one or more of the scan electrodes or sustain electrodes during a sustain period.
  • the energy supply time ER Up-Time and the energy recovery time ER Down-Time of the negative sustain pulse supplied to one or more of the scan electrodes or sustain electrodes each may be less than 300ns.
  • the energy supply time ER Up-Time and the energy recovery time ER Down-Time may be the same.
  • the energy recovery time ER Down-Time may be longer than the energy supply time ER Up-Time.
  • a gap between the scan electrode and the sustain electrode may be more than 100 ⁇ m.
  • the gap between the scan electrode and the sustain electrode may be more than 150 ⁇ m.
  • a driving method of a plasma display panel comprises a plurality of scan electrodes and sustain electrodes, wherein an energy supply time ER Up-Time and an energy recovery time ER Down-Time of a negative sustain pulse supplied to one or more of the scan electrodes or sustain electrodes during a sustain period of a plurality of sub-fields can be respectively adjusted.
  • the energy supply time ER Up-Time and the energy recovery time ER Down-Time of the negative sustain pulse supplied to one or more of the scan electrodes or sustain electrodes each may be less than 300ns.
  • the energy supply time ER Up-Time and the energy recovery time ER Down-Time may be the same.
  • a gap between the scan electrode and the sustain electrode may be more than 100 ⁇ m.
  • the gap between the scan electrode and the sustain electrode may be more than 150 ⁇ m.
  • a plasma display apparatus comprises a plasma display panel comprising a scan electrode, a sustain electrode, and a barrier rib, wherein the height of the barrier rib is less than a gap between the scan electrode and the sustain electrode, a driver driving the scan electrode and the sustain electrode, and a negative sustain pulse controller controlling the driver and adjusting each of an energy supply time and an energy recovery time of a negative sustain pulse supplied to one or more of the scan electrode or the sustain electrode during a sustain period.
  • the scan electrode and the sustain electrode each may include a transparent electrode, and the gap between the scan electrode and the sustain electrode may be substantially equal to a gap betwene the transparent electrode of the scan electrode and the transparent electrode of the sustain electrode.
  • a gap between the scan electrode and the sustain electrode may range from 100 ⁇ m to 400 ⁇ m.
  • a gap between the scan electrode and the sustain electrode may range from 150 ⁇ m to 350 ⁇ m.
  • FIG. 2 is a view illustrating a combination of a plasma display panel and a driver
  • FIG. 3 is a view illustrating a method of implementing image gray scale of a plasma display panel
  • FIG. 4 is a view illustrating driving waveforms according to a driving method of a plasma display panel
  • FIG. 8 is a view for illustrating a structure of a plasma display apparatus according to an embodiment of the present invention.
  • a voltage of an erase ramp waveform Ramp-ers having small pulse width and voltage level is supplied to the sustain electrodes in the erase period after the sustain discharge was completed, thereby erasing the wall charges residing within the discharge cells of the entire screen.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
EP06292000A 2006-12-20 2006-12-20 Plasmaanzeigevorrichtung und Ansteuerungsverfahren dafür Withdrawn EP1936591A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06292000A EP1936591A1 (de) 2006-12-20 2006-12-20 Plasmaanzeigevorrichtung und Ansteuerungsverfahren dafür

Applications Claiming Priority (1)

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EP06292000A EP1936591A1 (de) 2006-12-20 2006-12-20 Plasmaanzeigevorrichtung und Ansteuerungsverfahren dafür

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050219158A1 (en) * 2004-03-18 2005-10-06 Pioneer Plasma Display Corporation Plasma display and method for driving the same
EP1732056A1 (de) * 2005-06-07 2006-12-13 LG Electronic Inc. Plasmaanzeigevorrichtung und Verfahren zu ihrer Ansteuerung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050219158A1 (en) * 2004-03-18 2005-10-06 Pioneer Plasma Display Corporation Plasma display and method for driving the same
EP1732056A1 (de) * 2005-06-07 2006-12-13 LG Electronic Inc. Plasmaanzeigevorrichtung und Verfahren zu ihrer Ansteuerung

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