JP4362349B2 - Lighting stabilization processing apparatus for plasma display panel and lighting circuit used therefor - Google Patents

Description

  The present invention relates to a plasma display panel (hereinafter abbreviated as “PDP” where appropriate) used in a display device such as a television and a lighting circuit used therefor, and in particular, by lighting a PDP over a predetermined period over the entire surface. The present invention relates to an aging technique for a PDP that performs lighting stabilization processing (hereinafter referred to as “aging” as appropriate).

  A plasma display panel (PDP) is formed by bonding a plurality of substrates. A gas discharge is generated by enclosing a gas in a gap between the bonded substrates and applying a voltage to the gap. The plasma discharge is used to turn on the PDP.

  Usually, a PDP is provided with a scanning electrode for generating a discharge and a data electrode (also referred to as an address electrode) for designating a PDP region (hereinafter referred to as “cell” as appropriate) and lighting the designated cell. Has been. In order to generate a plasma discharge by applying a voltage to the scan electrode, for example, a voltage of about 200V to 300V is required. The voltage required to generate plasma discharge varies depending on the cell. For example, some cells are discharged by lighting at about 200V and others are not discharged even when about 250V is reached. In particular, the above phenomenon is noticeable in a new PDP immediately after manufacture.

Thus, when the manufacturing process of the PDP is completed, aging is performed to stabilize the lighting of the PDP by connecting the lighting power supply to the scan electrodes at once and lighting the PDP over the entire surface for a predetermined period (for example, about 12 to 24 hours). Processing is performed. That is, in a new PDP immediately after manufacturing, if the voltage necessary for generating plasma discharge is continuously applied to the scan electrode for a certain period, the voltage converges to a predetermined voltage. If the PDP is turned on over the entire period using this phenomenon, the voltage varies from cell to cell immediately after lighting, but the voltage becomes uniform in all cells after a predetermined period. As a result, by performing the aging process, it is possible to stabilize the lighting of the PDP (see, for example, Patent Document 1).
Japanese Patent Laying-Open No. 2003-187702 (page 2-3, FIG. 7)

  However, when the PDP is replaced with a different type or size, the aging process cannot be performed under the previous aging condition. Examples of the aging condition include the value of the applied voltage applied to the scan electrode and the rise time and fall time of the applied voltage. These conditions depend on the capacity of the PDP and the like, and the characteristics of the aging condition change every time the PDP to be aged is changed. Therefore, the aging condition is optimized every time the PDP to be aged is changed.

  Normally, a driver that outputs an applied voltage without changing the waveform of the input signal (for example, the amplitude or frequency of the waveform) applied to the applied voltage, or without changing the waveform (input waveform) of the input signal The aging condition is optimized by sequentially changing the impedance (for example, inductance) of the circuit (lighting circuit). When the input waveform is changed as in the former case, the input waveform must be switched every time it is changed, which takes time and labor. When the value of the impedance of the driver circuit is changed as in the latter case, the value of the applied voltage that changes due to the change in the impedance becomes discontinuous, and it is difficult to obtain an optimum aging condition.

  The present invention has been made in view of such circumstances, and it is possible to easily determine an aging (stabilization of lighting) condition without changing the waveform of an input signal. It is another object of the present invention to provide a lighting circuit used therefor.

As a result of intensive studies to solve the above problems, the present inventor has obtained the following knowledge.
That is, the element that can be varied other than the impedance of the driver circuit was considered. The driver circuit is provided with a switching element for switching the waveform of the input signal (input waveform). As the switching element, for example, an insulated gate bipolar transistor (IGBT) or a field effect transistor (FET) is used. The inventor has paid attention to this switching element.

  When the value of the gate voltage of the switching element is changed, the result when the gate voltage Vg is applied to the scan electrode and the peak value of the scan current flowing through the scan electrode when applied to the scan electrode is taken is shown in FIG. As shown in FIG. As can be seen from the results of FIG. 7, when the value of the gate voltage is changed, the peak value of the scanning current (“peak current Ip” in FIG. 7) continuously changes.

The present inventor has conceived of changing the gate voltage from the result of FIG. The present invention based on such knowledge has the following configuration.
That is, the invention described in claim 1 is formed by bonding a plurality of substrates, enclosing gas in a gap between the bonded substrates, and applying a voltage to the gap to generate plasma discharge. For the plasma display panel to be lit, a lighting circuit is connected to the scan electrode that generates plasma discharge, and an application voltage output from the lighting circuit is applied to the scan electrode. The plasma display panel lighting stabilization processing device performs the plasma display panel lighting stabilization processing by turning on the light for a predetermined period of time, and the lighting circuit switches the input signal for the applied voltage. A switching element to perform, and a variable power source that varies the gate voltage of the switching element. That with changing the value of the applied voltage by the change of gate voltage, the applied voltage which is characterized in that changing the value of the scanning current flowing in scan electrodes by applying to the scanning electrodes with change in applied voltage It is.

[Operation / Effect] According to the invention described in claim 1, the lighting circuit includes a switching element for switching the input signal for the applied voltage, and a variable power source for varying the gate voltage of the switching element. I have. The value of the applied voltage is changed by changing the gate voltage by the variable power supply, and the value of the scanning current flowing through the scan electrode is changed by changing the applied voltage by applying the applied voltage to the scan electrode. At this time, if the value of the gate voltage is changed, the value of the scanning current is continuously changed. Therefore, the aging (stabilization of lighting) condition can be easily obtained without changing the waveform of the input signal.

  One example of the above-described invention is switched to a correlation storage means for storing a correlation between a gate voltage and a scanning current obtained in advance for each plasma display panel, and a plasma display to be subjected to a lighting stabilization process. And a command means for reading out a correlation according to the switched plasma display panel from the correlation storage means, and giving a command to output a gate voltage based on the correlation to the variable power supply (claim 2). Invention).

  By providing such means, the scanning current corresponding to each plasma display panel that is the subject of the lighting stabilization process can be optimally determined, and the lighting stabilization process can be automatically controlled.

  Furthermore, in the invention described in claim 2 described above, preferably, an identification means for identifying a plasma display that is a target of the lighting stabilization process is provided, and when switching to a plasma display that is a target of the lighting stabilization process, The identification means identifies the switched plasma display panel and gives the identification result to the command means, and the command means gives the above-mentioned command to the variable power source based on the identification result and the correlation described above. Invention described in 1.).

  By providing such identification means and associating with each means, the lighting stabilization process can be automatically controlled even when the plasma display is switched, and the control of the lighting stabilization process is further automated. Can be achieved.

According to a fourth aspect of the present invention, a plurality of substrates are bonded together, a gas is sealed in a gap between the bonded substrates, and a voltage is applied to the gap to generate plasma discharge. A lighting circuit used in a lighting stabilization processing apparatus for a plasma display panel that performs lighting stabilization processing of the plasma display panel by lighting the plasma display panel to be lit for a predetermined period of time, A lighting circuit is configured by being connected to a scan electrode that generates plasma discharge. By applying an application voltage output from the lighting circuit to the scan electrode, the entire surface of the plasma display panel is lit for a predetermined period. The lighting circuit includes a switching element for switching an input signal for an applied voltage, and a switch for the switching element. And a variable power supply for varying the gate voltage of the grayed elements, along with changing the value of the applied voltage by the change of the gate voltage by the variable power supply, the scanning current flowing in scan electrodes by applying an applied voltage to the scan electrode The value is changed by changing the applied voltage.

[Operation / Effect] According to the invention described in claim 4, the lighting circuit according to claim 2 is provided with a switching element for switching an input signal for an applied voltage, and a gate voltage of the switching element. And a variable power supply that can be varied. The value of the applied voltage is changed by changing the gate voltage by the variable power supply, and the value of the scanning current flowing through the scan electrode is changed by changing the applied voltage by applying the applied voltage to the scan electrode. At this time, if the value of the gate voltage is changed, the value of the scanning current is continuously changed. Therefore, the aging (stabilization of lighting) condition can be easily obtained without changing the waveform of the input signal.

  According to the lighting stabilization processing apparatus for a plasma display panel and the lighting circuit used therefor according to the present invention, the lighting circuit includes a switching element for switching an input signal for an applied voltage, and a gate of the switching element. Equipped with a variable power supply that varies the voltage, and the scanning current value changes continuously when the gate voltage value is changed, so the aging (stabilization of lighting) conditions can be simplified without changing the waveform of the input signal. Can be requested.

Hereinafter, an embodiment of a PDP lighting stabilization processing apparatus (aging processing apparatus) according to the present invention will be described with reference to the drawings.
FIG. 1 is a schematic perspective view showing the configuration of the apparatus of the present embodiment, FIG. 2 is a plan view schematically showing each electrode of the PDP of the apparatus of the present embodiment, and FIG. 3 shows a PDP and a driver circuit. FIG. 4 is a block diagram of the apparatus of the present embodiment, and FIG. 5 is a schematic circuit diagram relating to the driver circuit.

  As shown in FIGS. 1 to 4, the embodiment apparatus includes an aging tray 11, a scan electrode short bar 12, a data electrode short bar 13, an identification unit 14, a correlation memory 15, a control unit 16, The driver circuit 20 is provided. The tray 11 is a table on which the plasma display panel (PDP) 1 is placed.

  On the other hand, the PDP 1 is formed by bonding a front substrate 2 and a back substrate 3 as shown in FIG. The front substrate 2 is made of, for example, glass, and the back substrate 3 is made of the same material as the front substrate 2.

On the lower surface of the front substrate 2, a scanning electrode 4 including an X electrode 4 a and a Y electrode 4 b, a transparent dielectric layer (not shown), and a protective layer are stacked in order from the top. The scan electrode 4 is formed of, for example, an ITO film (alloy oxide film of isodium and tin) or SnO ₂ (tin oxide film), and is formed of a transparent dielectric layer, for example, a low-melting glass paste. Is formed of, for example, MgO (magnesium oxide). The protective layer is a layer for protecting the scan electrode 4 from being directly exposed to plasma.

On the upper surface of the back substrate 3, data electrodes 5 and partition walls called “ribs” (not shown) are stacked in order from the top. The data electrode 5 is stacked so as to be orthogonal to the scanning electrode 4. The grooves surrounded by the adjacent barrier ribs are stacked so as to be positioned immediately above the data electrodes 5. In the grooves described above, fluorescent layers (not shown) formed of phosphors are stacked along the partition walls. The data electrode 5 is formed of, for example, an Ag (silver) paste or Al, and the partition wall is formed of, for example, a RuO ₂ (lutesium oxide) paste or a mixture of a low-melting glass and a metal oxide such as alumina. Has been.

  When the PDP 1 is a color, the phosphor layer is regularly arranged with phosphors of three colors R (Red), G (Green), and B (Blue) for each partition wall. The phosphor described above is formed of a “matrix” and a “light emission center” (not shown), and the above-mentioned matrix is ionized by ultraviolet rays generated by plasma discharge, and the matrix collides with the light emission center. When the light emission center is excited by the collision of the matrix and the excited light emission center returns to the ground state, visible light is generated, and the visible light is transmitted through the surface of the PDP 1 and is lit from the surface of the PDP 1.

  Returning to the description of the embodiment apparatus, as shown in FIGS. 1 and 3, when the PDP 1 is supported, the scan electrode short bar 12 described above is electrically connected to the scan electrode 4, and the data electrode The short bar 13 is configured to be electrically connected to the data electrode 5. That is, as shown in FIG. 3, when the PDP 1 is supported, the short bar 12 for scanning electrode comes into contact with the lower surface of the front substrate 2 so that the short bar 12 is electrically connected to the scanning electrode 4. Further, when the PDP 1 is supported, the data electrode short bar 13 comes into contact with the upper surface of the back substrate 3, whereby the short bar 13 is electrically connected to the data electrode 5. Each of the short bars 12 and 13 is provided in two sets, and each set is opposed to each other. In particular, one set of the scanning electrode short bars 12 is electrically connected to the X electrode 4a, and the other set is electrically connected to the Y electrode 4b.

  In order to prevent the scanning electrode short bar 12 from coming into contact with the back substrate 3, as shown in FIG. 3, the front substrate 2 has a portion corresponding to the electrode connecting portion along the opposing direction of the short bar 12 from the back substrate 3. In addition, the back substrate 3 protrudes from the front substrate 2 along the opposing direction of the short bar 13 so that the data electrode short bar 13 does not come into contact with the front substrate 2. Yes. Each short bar 12, 13 is electrically connected to the driver circuit 20 described above.

  As shown in FIG. 5, the driver circuit 20 is roughly composed of a scan electrode driver circuit 20A and a data electrode driver circuit 20B. The driver circuit 20 corresponds to the lighting circuit in the present invention.

  The scanning electrode driver circuit 20A includes two stages of switching elements 21 and 22, an impedance circuit 23 for scanning electrodes, a variable power supply 24 that varies the gate voltage Vg of the switching element 21, and a gate voltage Vg of the switching element 22. And a variable power source 25 for varying the power. The switching elements 21 and 22 are connected in series by connecting the drain side of the switching element 21 and the source side of the switching element 22, and the input signal waveform (input waveform) is connected to the source side of the switching element 21. The input voltage Vs is connected so as to be applied. Further, the input side of the scanning electrode impedance circuit 23 is connected to the drain side of the switching element 21 and the source side of the switching element 22, and via the scanning electrode short bar 12 (see FIGS. 1 and 3). The output side is connected to the X electrode 4 a and the Y electrode 4 b of the scanning electrode 4. By connecting the output side of the impedance circuit 23 to the scan electrode 4, the application voltages Vx and Vy output from the driver circuit 20 are applied to the scan electrode 4. Here, the application voltage Vx is the voltage of the X electrode 4a, and the application voltage Vy is the voltage of the Y electrode 4b.

  The data electrode driver circuit 20B includes two-stage switching elements 26 and 27, a data electrode impedance circuit 28, a power supply 29 that applies a gate voltage Vg ′ of the switching element 26, and a gate voltage Vg of the switching element 27. And a power source 30 for applying '. The switching elements 26 and 27 have the same configuration as the switching elements 21 and 22 of the scan electrode driver circuit 20A, and the data electrode impedance circuit 28 and the impedance circuit 23 of the scan electrode driver circuit 20A. It is the same composition. The switching element 26 is connected to the source side so that an input voltage Va having an input waveform is applied. The output side of the data electrode impedance circuit 28 is connected to the data electrode 5 through the data electrode short bar 13 (see FIGS. 1 and 3). By connecting the output side of the impedance circuit 28 to the data electrode 5, the application voltage Vads output from the driver circuit 20 is applied to the data electrode 5. Here, the application voltage Vads is the voltage of the data electrode. The power supplies 29 and 30 are different from the variable power supplies 24 and 25 of the scanning electrode driver circuit 20A, and the gate voltage Vg ′ is applied in a fixed state.

  In this embodiment, insulated gate bipolar transistors (IGBTs) are used as the switching elements 21, 22, 26 and 27. The switching element is not limited to an IGBT, and may be any element that is normally used for a switching element such as a field effect transistor (FET).

  The identification part 14 mentioned above identifies PDP1 mounted in the tray 11 for aging as shown in FIG. That is, the identification unit 14 identifies the PDP 1 that is the target of the lighting stabilization process (aging process). When switching to the PDP 1 to be aged, the identification unit 14 identifies the switched PDP 1 and gives the identification result to the control unit 16 described later. As for the identification unit 14, a normally used identification unit as exemplified by a CCD camera for identifying the shape of the PDP 1 or a detection unit (such as an optical sensor or a contact-type sensor) arranged in accordance with each size. What is necessary is just to comprise. The identification unit 14 corresponds to identification means in the present invention.

  The correlation memory 15 described above is a memory that stores the correlation between the gate voltage Vg obtained in advance for each PDP 1 and the scanning current Ipanel. The correlation between the gate voltage Vg and the scanning current Ipanel is, for example, as shown in FIG. 7, a peak value of the scanning current Ipanel that flows through the scanning electrode 4 when the gate voltage Vg is applied to the scanning electrode 4 on the horizontal axis. The peak current Ip is obtained by sequentially measuring the peak current Ip when the gate voltage Vg of the switching elements 21 and 22 is varied by the variable power sources 24 and 25 (see FIG. 5) with the horizontal axis of the peak current Ip. These correlations are measured in advance and written and stored in the correlation memory 15. What is necessary is just to carry out according to the kind and size of PDP, when storing beforehand. The correlation memory 15 is composed of a storage medium represented by ROM (Read-Only Memory), RAM (Random-Access Memory), and the like. The correlation memory 15 corresponds to the correlation storage means in the present invention.

  The control unit 16 controls and controls each component of the embodiment apparatus, and includes a CPU (Central Processing Unit) and the like. Further, in this embodiment, when the control unit 16 switches to the PDP 1 that is the target of aging, the control unit 16 reads the correlation according to the switched PDP 1 from the correlation memory 15, and converts it into the above-described identification result and correlation. A function of giving a command to output a desired gate voltage Vg based on the variable power sources 24 and 25 is also provided. The control unit 16 corresponds to command means in the present invention.

  Next, the aging operation procedure will be described with reference to the flowchart of FIG.

(Step S <b> 1) Identifying PDP The identifying unit 14 identifies PDP 1 placed on the aging tray 11 for aging, and gives the identification result to the control unit 16.

(Step S2) Gate Voltage Output Command For example, if the correlation shown in FIG. 7 corresponds to the PDP 1 that is the target of aging at the present time, a desired result is obtained based on the identification result and the correlation in FIG. A command for outputting the gate voltage Vg is given to the variable power sources 24 and 25, and the variable power sources 24 and 25 change the gate voltage Vg to a desired value.

(Step S3) Start of Aging While the scanning electrode short bar 12 and the scanning electrode 4 are electrically connected, the data electrode short bar 13 and the data electrode 5 are electrically connected from the driver circuit 20. A voltage (for application) is applied to each short bar. Then, the scan current Ipanel flows through the scan electrode 4 when applied to the scan electrode 4, and the data current flows through the data electrode 5 when applied to the data electrode 5. If desired value, for example V ₁ of the gate voltage Vg, the scanning electrodes 4 peak current I ₁ corresponding to V ₁ of the on the graph of the correlation as shown in FIG. 7 is a peak value of the scanning current Ipanel Flowing into.

  Actually, when the voltages Vx and Vy are applied to the scan electrode 4, the potential of the data electrode 5 is displaced. Therefore, the voltage Vads is also applied to the data electrode 5 side so that the voltage becomes about half of the ground potential or the voltage Vads. So that it is forcibly controlled. In this embodiment, the voltage Vads applied to the data electrode 5 is about half of the voltages Vx and Vy applied to the scan electrode 4 (for example, the input voltage Vs of the driver circuit 20A for the scan electrode is 250V, and the data electrode 5 The input voltage Va of the driver circuit 20B is 125V).

(Step S4) Is there an aging target PDP?
Aging is performed by lighting the PDP 1 over the entire surface for a predetermined period, and it is confirmed whether there is another PDP 1 subject to aging after the aging is completed.

(Step S5) Switching PDP If PDP1 is present, PDP1 that has been terminated at this time is removed from tray 11, and then PDP1 to be aged is placed on tray 11 to switch PDP1. Then, the process returns to step S1. If there is no aging target PDP 1 in step S4, the series of operations is terminated.

According to the embodiment apparatus having the above-described configuration, the driver circuit 20 uses the switching elements 21 and 22 for switching the input signals for the applied voltages Vx and Vy and the gate voltage Vg of the switching elements 21 and 22. Variable power sources 24 and 25 are provided. The values of the application voltages Vx and Vy are changed by the change of the gate voltage Vg by the variable power sources 24 and 25, and the value of the scan current Ipanel flowing through the scan electrode 4 by applying the application voltages Vx and Vy to the scan electrode 4 Is changed by changing the applied voltages Vx and Vy. At this time, if the value of the gate voltage Vg is changed, the value of the scanning current Ipanel (the peak current Ip in FIG. 7) continuously changes as shown in FIG. 7, so that the aging condition is maintained without changing the waveform of the input signal. Can be easily obtained.

  In this embodiment, when switching is made to the correlation memory 15 for storing the correlation (see FIG. 7) between the gate voltage Vg and the scanning current Ipanel obtained in advance for each PDP1, and the PDP1 to be aged. The controller 16 reads the correlation according to the switched PDP 1 from the correlation memory 15 and gives a command to the variable power sources 24 and 25 to output the gate voltage Vg based on the correlation. By providing such a configuration, it is possible to optimally obtain the scanning current Ipanel corresponding to each PDP 1 to be aged and to automatically control the aging process.

  Furthermore, an identification unit 14 for identifying the PDP 1 to be aged is provided. When switching to the PDP 1 to be aged, the identification unit 14 identifies the switched PDP 1 and the identification result is sent to the control unit 16. The control unit 16 gives the above-described command to the variable power sources 24 and 25 based on the identification result and the above-described correlation. By providing such an identification unit 14 and associating each component (identification unit 14, correlation memory 15, control unit 16, variable power supply 24, 25, etc.), aging is also performed when switching to PDP 1 as in step S5. Can be automatically controlled, and the aging control can be further automated.

  Further, as described above, it was confirmed from FIG. 7 that the value of the scanning current Ipanel changes continuously when the value of the gate voltage Vg is changed. Further, it was confirmed from FIGS. 8 to 10 that when the value of the gate voltage Vg is changed, the values of the application voltages Vx and Vy are also changed.

  8 to 10 are graphs showing temporal changes in the voltage value and the scanning current value for each electrode when the value of the gate voltage Vg is changed. 8 to 10, the horizontal axis represents time, and the vertical axis represents voltage or current value. FIGS. 8A, 9A, and 10A show temporal changes in the voltage Vx of the X electrode 4a and temporal changes in the voltage Vads of the data electrode, respectively. FIGS. 8B, 9B, and 10B show temporal changes in the voltage Vy of the Y electrode 4b and temporal changes in the scanning current Ipanel, respectively. The frequency f of the input waveform is 40 kHz, the input voltage Vs applied to the voltages Vx and Vy is 250V, and the input voltage Va applied to the voltage Vads is 125V.

Aging in the while the voltage to one electrode of the scanning electrodes 4 is applied no voltage is applied to the other electrode. When one electrode falls, the other electrode rises so as to replace it. As shown in FIGS. 8 to 10, the voltage Vy is not applied to the Y electrode 4 b while the voltage Vx is applied to the X electrode 4 a of the scan electrode 4. When the voltage Vx falls, the voltage Vy rises in synchronization with it. When the voltage Vy rises, the scan current Ipanel falls to a negative value, and then rises to a positive value and attenuates between positive and negative. The time when the voltage falls to the first negative value is the lighting time. The most falling value is the peak current Ip.

  8 shows a case where the gate voltage Vg is 15.0 V, FIG. 9 shows a case where the gate voltage Vg is 9.0 V, and FIG. 10 shows a case where the gate voltage Vg is 8.0 V. Accordingly, it can also be seen from FIGS. 8 to 10 that the fall time of the voltage Vx and the fall time of the voltage Vy change, and the amplitude of the scanning current Ipanel also changes.

  Since the gate voltage Vg ′ in the data electrode driver circuit 20B is in a fixed state, the value of the voltage Vads does not change. However, as described above, when the voltages Vx and Vy are applied to the scan electrode 4, the potential of the data electrode 5 is actually displaced, so that the value of the voltage Vads applied to the data electrode 5 according to the change of the voltages Vx and Vy. Also changes somewhat. This change was confirmed from FIGS.

  The present invention is not limited to the above embodiment, and can be modified as follows.

  (1) In the above-described embodiment, the gate voltage Vg of both the switching elements 21 and 22 is variable, but only one of the switching elements 21 and 22 is variable, and the other of the switching elements 21 and 22 is variable. The gate voltage Vg may be fixed.

  (2) In the above-described embodiment, the switching element has a two-stage structure (switching elements 21, 22). However, there may be only one stage, or a plurality of stages including three or more stages.

  (3) In the above-described embodiment, the gate voltage Vg ′ in the data electrode driver circuit 20B is fixed, but the gate voltage Vg ′ may also be configured to be variable.

  (4) In the embodiment described above, the identification unit 14 for identifying the PDP 1 to be aged is provided in order to automatically control the aging even when switching to the PDP 1, but it is not automatically controlled. For example, the identification unit 14 is not always necessary.

  (5) In the embodiment described above, the identification unit 14, the correlation memory 15, and the control unit 16 are provided to automatically control the aging process. It is not always necessary.

  (6) The present invention may be applied to an AC (alternating current) type PDP or a DC (direct current) type PDP. In the case of an AC type PDP, the driver circuit 20 is connected to an AC power source, and in the case of a DC type PDP, the driver circuit 20 is connected to a DC power source.

  (7) The present invention may be applied to a surface discharge type PDP or may be applied to a counter discharge type PDP. In the case of the surface discharge type PDP, the X electrode 4a and the Y electrode 4b (see FIG. 2) are formed on the same front substrate 2 as in the above-described embodiment, and the discharge is generated in the same plane. In the case of the counter discharge type PDP, an X electrode is formed on the front substrate and a Y electrode is formed on the rear substrate, and a discharge is generated between the front substrate and the rear substrate.

  (8) The present invention may be applied to a reflective PDP or a transmissive PDP. In the case of the reflection type PDP, visible light generated by the plasma discharge is transmitted through the surface of the PDP, and lighting is confirmed from the surface (upper surface) of the PDP. In the case of the transmission type PDP, by the plasma discharge The generated visible light is transmitted as it is to the back surface of the PDP, and lighting is confirmed from the back surface (lower surface) of the PDP.

It is a schematic perspective view which shows the structure of a present Example apparatus. It is the top view which showed each electrode of the plasma display panel (PDP) typically. It is a circuit diagram which shows the electrical connection of PDP and a driver circuit. It is a block diagram of a present Example apparatus. It is a schematic circuit diagram regarding a driver circuit. It is a flowchart which shows a series of flows in the aging process of PDP. It is a graph which shows the change of the peak current which is the peak value of a scanning current when changing the value of the gate voltage of a switching element. (A), (b) is the graph which showed the time change of the value of the voltage regarding each electrode, and the value of a scanning current when changing the value of a gate voltage, respectively. (A), (b) is the graph which showed the time change of the value of the voltage regarding each electrode, and the value of a scanning current when changing the value of a gate voltage, respectively. (A), (b) is the graph which showed the time change of the value of the voltage regarding each electrode, and the value of a scanning current when changing the value of a gate voltage, respectively.

Explanation of symbols

1 ... Plasma display panel (PDP)
DESCRIPTION OF SYMBOLS 2 ... Front substrate 3 ... Back substrate 4 ... Scan electrode 20 ... Driver circuit 21, 22 ... Switching element 24, 25 ... Variable power supply Vg ... Gate voltage Vx, Vy ... Applied voltage Ipanel ... Scan current

Claims (4)

A plasma display panel is formed by laminating a plurality of substrates, sealing a gas into a gap between the laminated substrates, and applying a voltage to the gap to generate a plasma discharge to turn on the plasma display panel. By connecting a lighting circuit to a scan electrode that generates a discharge, applying an application voltage output from the lighting circuit to the scan electrode, and lighting the entire surface of the plasma display panel for a predetermined period of time, plasma A lighting stabilization processing apparatus for a plasma display panel that performs a lighting stabilization process for a display panel,
The lighting circuit
A switching element for switching the input signal for the applied voltage;
A variable power supply that varies the gate voltage of the switching element,
The value of the applied voltage is changed by changing the gate voltage by the variable power supply, and the value of the scanning current flowing through the scan electrode is changed by changing the applied voltage by applying the applied voltage to the scan electrode. Lighting stabilization processing equipment for plasma display panels. In the lighting stabilization processing apparatus of the plasma display panel according to claim 1,
Correlation storage means for storing a correlation between the gate voltage and the scanning current obtained in advance according to each plasma display panel;
When switching to the plasma display that is the target of the lighting stabilization process, the correlation according to the switched plasma display panel is read from the correlation storage means, and a command to output the gate voltage based on the correlation is issued. A lighting stabilization processing apparatus for a plasma display panel, comprising command means for giving to the variable power source. In the lighting stabilization processing apparatus of the plasma display panel according to claim 2,
Comprising an identification means for identifying a plasma display to be subjected to a lighting stabilization process,
When switching to the plasma display that is the target of the lighting stabilization process, the identification means identifies the switched plasma display panel, and gives the identification result to the command means,
The lighting stabilization processing apparatus for a plasma display panel, wherein the command means gives the command to the variable power source based on the identification result and the correlation. For a plasma display panel that is formed by bonding a plurality of substrates, gas is sealed in the gap between the bonded substrates, and a voltage is applied to the gap, thereby generating plasma discharge and lighting the plasma display panel. A lighting circuit used in a lighting stabilization processing device of a plasma display panel that performs lighting stabilization processing of a plasma display panel by lighting the entire surface for a predetermined period,
Connected to the scan electrode that generates plasma discharge, the lighting circuit is configured,
By applying the application voltage output from the lighting circuit to the scan electrode, the entire surface of the plasma display panel is lit for a predetermined period of time,
The lighting circuit
A switching element for switching the input signal for the applied voltage;
A variable power supply that varies the gate voltage of the switching element,
The value of the applied voltage is changed by changing the gate voltage by the variable power supply, and the value of the scanning current flowing through the scan electrode is changed by changing the applied voltage by applying the applied voltage to the scan electrode. The lighting circuit to do.

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