JP4819315B2 - Plasma display and driving method thereof - Google Patents

Description

  The present invention relates to a plasma display and a driving method thereof.

  The plasma display has a display panel composed of a plurality of cells arranged in a two-dimensional matrix, and excites phosphors to emit light by discharge in each cell. Each cell of the display panel corresponds to one pixel of the display image, and the plasma display can display a two-dimensional image.

  However, since a plasma display is a display device that displays an image using a discharge phenomenon, phosphor deterioration due to discharge or the like, exhaustion of a protective film (for example, magnesium oxide: MgO) in a cell, and the like. Arise. Therefore, in the plasma display, the physical properties (discharge characteristics, etc.) of the display panel change as the usage time (driving time) increases. Further, the discharge characteristics of the display panel are also affected by the temperature at the time of actual use such as the panel temperature and the actual use environment temperature. The change in the physical properties of the display panel causes a change in the operating voltage margin and the like, and is one of the causes for causing erroneous display in the plasma display.

  As a method for dealing with such a change in physical properties of the display panel, a method of controlling the driving method according to the usage time of the plasma display has been proposed. For example, a method for predicting and driving the optimum driving voltage of the display panel according to the usage time of the plasma display (see, for example, Patent Document 1), and a method for changing and controlling the driving voltage value of the display panel and its application timing (For example, refer to Patent Document 2).

JP-A-9-138668 JP 2003-15590 A

However, the above-described conventional method is not sufficient as a method for removing the cause of erroneous display, merely compensating for the voltage value applied to the display panel and its application timing in accordance with the change in physical properties of the display panel. .
The present invention has been made in view of such circumstances, and it is possible to more appropriately control a display panel driving method and avoid display problems according to changes in physical properties of a display panel in a plasma display. Objective.

In the plasma display according to the present invention, the plurality of first electrodes and the plurality of second electrodes are arranged in parallel to each other, and the plurality of third electrodes intersect the first and second electrodes. In accordance with the arranged display unit, the drive control unit that changes the drive pulse applied to each electrode of the display unit according to the use conditions, and each electrode of the display unit based on an instruction from the drive control unit A drive unit that applies a drive pulse, and the drive control unit is a subfield having a reset period, an address period, and a sustain discharge period in this order in accordance with data corresponding to the temperature of the display unit. after the end of the sustain discharge period, adding a driving pulse to be applied to additional reset period for applying the driving pulse having the same waveform as the drive pulse applied to the reset period is newly provided on the second electrode, walk Do not add the additional reset period, and controlling the driving unit to perform either.

  According to the present invention, by changing the driving pulse to a more appropriate driving pulse according to the usage condition of the plasma display and applying it to each electrode, it is possible to realize more appropriate driving according to the change in physical properties of the display panel. Display defects including display can be avoided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the following, an embodiment of the present invention will be described with reference to an example in which the present invention is applied to an AC drive type plasma display.

FIG. 1 is a diagram illustrating a configuration example of a plasma display according to an embodiment of the present invention.
As shown in FIG. 1, the plasma display in this embodiment is provided with scanning electrodes (display electrodes) Y1 to Yn and display electrodes X1 to Xn parallel to each other, and orthogonal to these electrodes Y1 to Yn and X1 to Xn. Address electrodes A1 to Aj are provided in such a direction (so as to intersect). The display electrodes X1 to Xn are provided in close proximity to the scanning electrodes Y1 to Yn.

  The display panel 1 includes a plurality of cells arranged in a matrix of m rows and n columns. Each cell Cij is formed by an intersection of the scan electrode Yi and the address electrode Aj and a display electrode Xi adjacent to the intersection. This cell Cij corresponds to one pixel of the display image, and the display panel 1 can display a two-dimensional image.

  The display panel 1 includes a display area 2 and a non-display area (hereinafter also referred to as “dummy display area”) 3 provided around the display area 2. The display area 2 is an area for displaying a display image based on the input data D. For the cells in the area 2, the electrodes X, Y, A are driven according to the input data D. On the other hand, the dummy display region 3 is a region that is always black regardless of the input data D, and the cells corresponding to the black image display are always driven for the electrodes X, Y, and A in the cells in the region 3. .

  The display electrodes X1 to Xn are connected to the output terminal of the X-side common driver 4 that supplies a predetermined voltage (drive pulse) to the display electrodes X1 to Xn according to the control of the driver control unit 10. The scan electrodes Y1 to Yn are connected to the output terminals of the Y-side scan driver 5 that supplies a predetermined voltage (drive pulse) to the scan electrodes Y1 to Yn according to the control of the driver control unit 10 and the Y-side common driver 6. It is connected. The address electrodes A1 to Aj are connected to the output terminal of the address driver 7 that applies a predetermined voltage (drive pulse) to the address electrodes A1 to Aj according to the control of the display data control unit 11 and the driver control unit 10. .

  The X-side common driver 4 is composed of a circuit that repeats discharge, and the address driver 6 is composed of a circuit that selects a column to be displayed. The Y-side circuit is composed of the Y-side scan driver 5 and the Y-side common driver, and the Y-side circuit includes a circuit that performs line sequential scanning and a circuit that repeats discharge. By determining the cell to be lit by the line sequential scanning circuit in the Y side circuit and the address driver 4, and repeating the discharge by the circuit repeating the discharge in the X side common driver 4 and the Y side circuit, the plasma display Perform display operation.

  The logic unit 8 includes a luminance / power control unit 9, a driver control unit 10, a display data control unit 11, and a detection unit 12. The logic unit 8 generates a control signal based on the external input data D, the dot clock CLK indicating the read timing of the input data D, the horizontal synchronization signal HS, and the vertical synchronization signal VS, and generates the control signal from the X side common driver 4. , Y side scan driver 5, Y side common driver 6, and address driver 7.

  Specifically, in the logic unit 8, the driver control unit 10 generates and outputs a control signal based on signals from the luminance / power control unit 9 and the display data control unit 11. At this time, the driver control unit 10 appropriately changes the drive pulse applied to each of the electrodes X, Y, and A from the drivers 4 to 7 in accordance with each data supplied from the detection unit 12. Generate.

  Here, the data supplied from the detection unit 12 to the driver control unit 10 includes data indicating a use time of the plasma display, a use temperature, and a current value when a drive pulse is applied to each electrode of the display panel 1. . That is, the detection unit 12 detects the use time, the use temperature, and the current value described above, and supplies data based on the detection result to the driver control unit 10.

  More specifically, the data indicating the usage time includes an accumulated time (power supply time) when power is supplied to the plasma display and an accumulated time (actual display time) when an image is actually displayed on the display panel 1. There is data to show each. The data indicating the use temperature includes data indicating the actual use environment temperature of the plasma display and the panel temperature of the display panel 1. The data indicating the current value includes data indicating the current value for the display area 2 in the display panel 1 and the current value for the dummy display area 3. Note that in the present embodiment, it is not necessary to apply all of the above-described data, and it may be arbitrarily selected from the plurality of data described above and applied.

FIG. 2 is a diagram illustrating a configuration example of the driver control unit 10 illustrated in FIG. 1.
In FIG. 2, the driver control unit 10 includes a ROM 21 and a processing unit (MPU) 22.

  The ROM 21 has a plurality of types of drive pulses A-1, B-1, C-1, A-2, B-2, C as drive pulse change patterns to be changed according to each data supplied from the detection unit 12. -2. I remember ... The ROM 21 may store a plurality of types of drive pulses with a field or subfield described later as one unit, or may store each drive pulse applied in the subfield. .

  The processing unit 22 includes a waveform change instruction unit 23 that instructs to change the drive pulse in accordance with each data supplied from the detection unit 12. The processing unit 22 analyzes each data supplied from the detection unit 12 with the waveform change instruction unit 23 and selects a driving pulse from a plurality of types of driving pulses stored in the ROM 21 based on the analysis result. Further, the processing unit 22 generates a control signal corresponding to the selected drive pulse and outputs it to the drivers 4 to 7.

  FIG. 3A is a diagram illustrating a cross-sectional configuration of the cell Cij in the i-th row and the j-th column which is one pixel. In FIG. 3A, the display electrode Xi and the scanning electrode Yi are formed on the front glass substrate 31. A dielectric layer 32 for insulating the discharge space 37 is deposited thereon, and a MgO (magnesium oxide) protective film 33 is further deposited thereon.

  On the other hand, the address electrode Aj is formed on a rear glass substrate 34 disposed opposite to the front glass substrate 31, and a dielectric layer 35 is deposited thereon, and a phosphor 38 is further deposited thereon. Has been. Ne + Xe Penning gas or the like is enclosed in the discharge space 37 between the MgO protective film 33 and the dielectric layer 35.

  FIG. 3B is a diagram for explaining the capacitance Cp of the plasma display. As shown in FIG. 3B, each cell of the plasma display includes a discharge space 37, a display electrode Xi, and a scan electrode Yi. And the front glass substrate 31 have capacitance components Ca, Cb, and Cc, respectively, and the sum of these components determines the capacitance Cpcell per cell (Cpcell = Ca + Cb + Cc). The sum of the capacities Cpcell of all cells is the panel capacity Cp.

  FIG. 3C is a diagram for explaining light emission of the plasma display. As shown in FIG. 3C, on the inner surface of the rib 36, red, blue and green phosphors 38 are arranged and applied in stripes for each color, and between the display electrodes Xi and the scanning electrodes Yi. The phosphor 38 is excited by discharge to emit light.

  FIG. 4 is a diagram showing a configuration of a driving circuit of the plasma display shown in FIG. The drive circuit shown in FIG. 4 corresponds to the X-side common driver 4, the Y-side scan driver 5, and the Y-side common driver 6 in FIG.

  In FIG. 4, a capacitive load (hereinafter referred to as “load”) 40 includes an arbitrary one of the display electrodes X1 to Xn described above and a plurality of scan electrodes Y1 to Yn. This is the total capacity of the cells formed between any one scan electrode Y. A common electrode X and a scan electrode Y are formed on the load 40.

The Y-side circuit for driving the scan electrode Y includes one capacitor CY1 and five switches SWY1 to SWY5.
The switches SWY1 and SWY2 are connected in series between a power supply line (power supply line) of a voltage Vs supplied from a power supply and a ground (GND) as a reference potential. One terminal of the capacitor CY1 is connected to the interconnection point of the two switches SWY1 and SWY2, and the switch SWY3 is connected between the other terminal of the capacitor CY1 and the ground. Note that a signal line connected to one terminal of the capacitor CY1 is a first signal line OUTAY, and a signal line connected to the other terminal is a second signal line OUTBY.

  The switches SWY4 and SWY5 are connected in series to both ends of the capacitor CY1 of the power supply circuit 22. That is, the switches SWY4 and SWY5 are connected in series between the first and second signal lines OUTAY and OUTBY. The interconnection point of the two switches SWY4 and SWY5 is connected to the scan electrode Y of the load 40 via the output line OUTCY.

  Further, the X-side circuit for driving the common electrode X is configured in the same manner as the Y-side circuit described above, and thus description thereof is omitted.

  On the Y side of the drive circuit shown in FIG. 4, the switches SWY1, SWY3, and SWY4 are turned on and the switches SWY2, SWY5 are turned off, whereby the charge corresponding to the voltage Vs applied to the capacitor CY1 by the switches SWY1, SWY3. Is stored, and the voltage Vs of the first signal line OUTAY is applied to the load 40 via the output line OUTCY.

  Further, in a state where charges according to the voltage Vs are accumulated in the capacitor CY1, the switches SWY2, SWY5 are turned on and the switches SWY1, SWY3, SWY4 are turned off, so that the voltage of the second signal line OUTBY becomes (− Vs), and the voltage (−Vs) is applied to the load 40 via the output line OUTCY.

  In this way, the positive voltage Vs and the negative voltage (−Vs) are alternately applied to the scan electrode Y of the load 40. Similarly, the positive voltage Vs and the negative voltage (−Vs) are alternately applied to the common electrode X of the load 40 by performing the same switching control. At this time, the voltages (± Vs) applied to the scanning electrode Y and the common electrode X are set to have phases opposite to each other. That is, when a positive voltage Vs is applied to the scan electrode Y, a negative voltage (−Vs) is applied to the common electrode X. As a result, a potential difference capable of discharging between the scanning electrode Y and the common electrode X can be generated.

  FIG. 5 is a configuration diagram of one frame FR of an image. The image is formed at 60 frames / second, for example. One frame FR is formed by a first subframe SF1, a second subframe SF2,..., An nth subframe SFn. This n is, for example, 10, and corresponds to the number of gradation bits. Each of the subframes SF1, SF2, etc., or their generic name is hereinafter referred to as “subframe SF”.

  Each subframe SF has a reset period Tr, an address period Ta, and a sustain period (sustain discharge period) Ts. In the reset period Tr, the display cell is initialized. In the address period Ta, lighting or non-lighting of each display cell can be selected by address designation. The selected cell emits light during the sustain period Ts. The number of times of light emission (time) is different in each subfield SF. Thereby, the gradation value can be determined.

  FIG. 6 is a waveform diagram showing the basic operation of the plasma display shown in FIG. FIG. 6 shows a waveform example of a drive pulse (voltage) applied to the common electrode X, the scan electrode Y, and the address electrode A in one subfield. As described above, one subfield is divided into a reset period including an entire writing period and an entire erasing period, an address period, and a sustain discharge period.

In the reset period, first, the voltage applied to the common electrode X is pulled down from the ground level as the reference potential to (−Vs). On the other hand, the voltage applied to the scan electrode Y gradually increases with time, and the write voltage Vw is finally applied to the scan electrode Y.
In this way, the reset pulse is applied to the common electrode X and the scanning electrode Y, and the potential difference between the electrodes becomes (Vs + Vw), and discharge is performed in all cells of all display lines regardless of the previous display state, and the wall Charge is formed (full-surface writing).

  Next, after the voltages of the common electrode X and the scan electrode Y are returned to the ground level, the voltage for the common electrode X is raised from the ground level to Vs, and the voltage applied to the scan electrode Y is lowered to (−Vs). As a result, the voltage of the wall charge itself exceeds the discharge start voltage in all cells, and the discharge starts, and the accumulated wall charge is erased (entire erasure).

  Next, in the address period, address discharge is performed line-sequentially in order to turn on / off each cell in accordance with input data. At this time, the voltage Vs is applied to the common electrode X. Further, when a voltage is applied to the scan electrode Y corresponding to a certain display line, the scan electrode Y selected in line sequential order has a (−Vs) level scan pulse, and the non-selected scan electrode Y has a ground level voltage. Is applied.

  At this time, the address pulse of the voltage Va is selectively applied to the address electrode Aj corresponding to the cell causing the sustain discharge in each of the address electrodes A1 to Am, that is, the cell to be lit. As a result, a discharge occurs between the address electrode Aj of the cell to be lit and the scanning electrode Y selected in a line sequential manner, and this is used as a priming (seeding) for the MgO protective film surface on the common electrode X and the scanning electrode Y. In addition, an amount of wall charges that can be sustained next is accumulated.

  Thereafter, during the sustain discharge period, voltages having different polarities (+ Vs, −Vs) are alternately applied to the common electrode X and the scan electrode Y of each display line to perform a sustain discharge and display an image of one subfield. To do. The operation of alternately applying voltages having different polarities is called a sustain operation, and the voltage (+ Vs, −Vs) pulse during the sustain operation is called a sustain pulse.

  In the sustain discharge period, the voltage (Vs + Vx) is applied only when the high voltage is first applied to the scan electrode Y. The voltage Vx is an additional voltage that generates a voltage necessary for the sustain discharge by adding to the wall charge voltage generated in the address period.

  As described above, in this embodiment, the driver control unit 10 in the logic unit 8 applies each of the electrodes X, Y, and A from the drivers 4 to 7 in accordance with each data supplied from the detection unit 12. The drive pulse is changed as appropriate. Here, the drive pulse is changed when the plasma display observer does not feel uncomfortable, for example, when the plasma display starts up or when the plasma display is powered but not displayed It is desirable to do this at the time of switching the input signal.

To change the drive pulse,
(1) Addition of drive pulse (2) Delete of drive pulse (3) Change of pulse shape of drive pulse (4) Change of pulse width and phase of drive pulse (5) Change of tilt of drive pulse (tilt wave)
(6) There is a change in the voltage value of the drive pulse.

Hereinafter, each will be described with reference to waveform diagrams.
(1) Addition of Drive Pulse FIG. 7 is a diagram illustrating an example of a waveform diagram when a drive pulse is added.
The waveform diagram shown in FIG. 7 is obtained when a sustain pulse of voltage (−Vs) is applied to the display electrode X and a sustain pulse of voltage (Vs + Vx) is applied to the scan electrode Y in the sustain discharge period in the waveform diagram shown in FIG. The drive pulse is added so that the drive pulse of the voltage Vax is applied to the address electrode A.

  As described above, when a high voltage is first applied to the scan electrode Y, the voltage Vx is added to generate a voltage necessary for the sustain discharge by adding to the wall charge voltage generated in the address period. However, since the voltage of the scan electrode Y becomes (Vs + Vx), the potential difference between the address electrode A and the scan electrode Y becomes large, and there is a risk of causing an erroneous discharge between the address electrode A and the scan electrode Y.

  Therefore, as shown in FIG. 7, when a voltage (Vs + Vx) is applied to the scan electrode Y, a drive pulse is added so as to apply a voltage Vax (for example, Vx corresponding to the added amount) to the address electrode A. The potential difference between the address electrode A and the scan electrode Y is reduced to prevent erroneous discharge. Thereby, the excessive lighting in the display panel 1 of a plasma display can be prevented, and a favorable image can be displayed.

FIG. 8 is a diagram illustrating another example of a waveform diagram when a drive pulse is added.
The waveform diagram shown in FIG. 8 is obtained by providing an additional reset period in which a drive pulse similar to the reset period is applied after the sustain discharge period in the waveform diagram shown in FIG. That is, when this additional reset period is provided, there are two consecutive reset periods in one subfield. By adding a drive pulse in this manner and providing an additional reset period after the end of the sustain discharge period, it is possible to reliably initialize the display cell and prevent excessive lighting and non-lighting in the subsequent sustain discharge period. And a good image can be displayed.
In FIG. 8, the case where one additional reset period is provided is shown as an example, but the number of additional reset periods is arbitrary.

(2) Deletion of Drive Pulse FIG. 9 is a diagram showing an example of a waveform diagram when the drive pulse is deleted.
The waveform diagram shown in FIG. 9 is obtained by deleting the sustain pulse of the high voltage (Vs + Vx) that is first applied to the scan electrode Y in the sustain discharge period in the waveform diagram shown in FIG.
As described above, the number of times of light emission differs for each subfield SF, but depending on the change in physical properties of the display panel 1, the luminance obtained by light emission for the specified number of times of light emission may be lowered or increased. Therefore, for example, when the luminance obtained by light emission for the specified number of times of light emission becomes high, by appropriately deleting the sustain pulse as shown in FIG. Is reduced so that a good image can be displayed.

(3) Change of Pulse Shape of Drive Pulse FIG. 10 is a diagram showing an example of a waveform diagram when the pulse shape of the drive pulse is changed.
In FIG. 10, the waveform indicated by the broken line is the waveform before the pulse shape change of the drive pulse, and the waveform indicated by the solid line is the waveform after the pulse shape change.
In this way, for example, by changing the waveform of the drive pulse from a square wave to a ramp wave that gradually changes over time, the probability of occurrence of discharge is reduced, or a weaker discharge is generated compared to a square wave. can do. Thereby, the excessive lighting etc. in the display panel 1 of a plasma display can be prevented.

(4) Change of Pulse Width and Phase of Drive Pulse FIG. 11A is a diagram showing an example of a waveform diagram when the pulse width and phase of the drive pulse are changed. In FIG. 11A, the broken line indicates the drive pulse before the change, and the solid line indicates the drive pulse after the change.
Generally, in the display panel 1 of a plasma display, as the usage time increases, the discharge between the electrodes hardly occurs. Therefore, according to the relationship shown in FIG. 11B, the probability of occurrence of discharge between the electrodes can be adjusted by adjusting the pulse width and phase of the drive pulse as shown in FIG. 11A. For example, by increasing the pulse width of the drive pulse, the probability of occurrence of discharge between the electrodes can be increased, and by reducing the pulse width, the probability of occurrence of discharge between the electrodes can be lowered. Note that in FIG. 11B, the horizontal axis represents the usage time, and the vertical axis represents the pulse width. In the figure, the hatched region is an ideal pulse width region, and the stepped solid line shown in the region indicates the pulse width that is actually changed.

(5) Drive pulse inclination change (inclination wave)
FIG. 12A is a diagram illustrating an example of a waveform diagram when the slope of the drive pulse is changed. In FIG. 12A, the broken line indicates the drive pulse before the change, and the solid line indicates the drive pulse after the change.
In this way, by adjusting the slope of the drive pulse as shown in FIG. 12A in accordance with the relationship shown in FIG. 12B, for example, the intensity of the weak discharge performed in the reset period is adjusted. Can do. In FIG. 12B, the horizontal axis represents the usage time, and the vertical axis represents the inclination. Also, in the figure, the hatched area is an inclination area showing ideal characteristics, and the stepped solid line shown in the area indicates the inclination that is actually changed.
In FIG. 11B and FIG. 12B described above, the pulse width and the slope that are actually changed are changed stepwise (discretely) according to the use time. You may make it change continuously (for example, linearly) with respect to time.

(6) Change of Voltage Value of Drive Pulse FIG. 13 is a diagram illustrating an example of a waveform diagram when the voltage value of the drive pulse is changed. In FIG. 13, the broken line shows the drive pulse before the change, and the solid line shows the drive pulse after the change.
As shown in FIG. 13, by changing the voltage value of the drive pulse, even if the operating voltage margin changes due to the change in physical properties of the display panel 1, the discharge in the display cell can be reliably performed. A good image can be displayed.

  FIG. 14 is a flowchart showing an example of the drive pulse changing operation in the plasma display according to the present embodiment. In FIG. 14, the driving pulse changing operation based on the usage time (driving time) supplied from the detection unit 12 and the data indicating the current value when the driving pulse is applied to the cells in the dummy display area 3. This is executed by the drive control unit 10 shown in FIG.

First, when power is supplied to the plasma display, the drive control unit 10 selects the drive waveform 1 stored in the ROM 21 in step S1.
In step S2, the drive control unit 10 determines whether the drive time is x1 (hour) or less or the current value is y1 (A) or less. In S3, the drive waveform 2 stored in the ROM 21 is selected.

Similarly, in step S4, the drive control unit 10 determines whether the drive time is equal to or less than x2 (time) or the current value is equal to or less than y2 (A), and if either condition is satisfied, In step S5, the drive waveform 3 stored in the ROM 21 is selected.
Hereinafter, similarly, the drive control unit 10 determines the drive time and the current value, and selects the drive waveform stored in the ROM 21 according to the determination result.
Then, the drive control unit 10 generates a control signal based on the selected drive waveform and supplies the control signal to the drive circuits 4 to 7.

  FIG. 15 is a flowchart showing another example of the drive pulse changing operation in the plasma display according to the present embodiment. FIG. 15 shows a drive pulse changing operation based on data indicating the panel temperature of the display panel 1 supplied from the detection unit 12, and is executed by the drive control unit 10 shown in FIG.

First, when power is supplied to the plasma display, the drive control unit 10 selects the drive waveform 1 stored in the ROM 21 in step S1.
In step S2, the drive control unit 10 determines which temperature range the panel temperature Tp belongs to.

  As a result of the above determination, when the panel temperature Tp is equal to or lower than the temperature Ta, the drive control unit 10 selects the drive waveform 1 stored in the ROM 21 (step S13), and the panel temperature Tp is higher than the temperature Ta and lower than the temperature Tb. In this case, the drive waveform 2 stored in the ROM 21 is selected (step S14). Similarly, when the panel temperature Tp is higher than the temperature Tb and lower than the temperature Tc, the drive waveform 3 stored in the ROM 21 is selected (step S15), and when the panel temperature Tp is higher than the temperature Tc, stored in the ROM 21. Drive waveform 4 is selected (step S16).

Then, the drive control unit 10 generates a control signal based on the selected drive waveform and supplies the control signal to the drive circuits 4 to 7 and returns to step S12 to determine again which temperature range the panel temperature Tp belongs to. to decide.
Thereafter, the above-described operation is repeated as needed to select a drive waveform according to the panel temperature Tp.

  In the above description, the case based on the driving time (usage time) and the current value (see FIG. 14) and the case based on the panel temperature (see FIG. 15) are described separately, but these are combined to drive. A pulse changing operation may be performed. In FIG. 14, since the current value for the dummy display area 3 is used, it is determined whether or not the determination condition regarding the current value is a certain value or less. When the current value is used, it may be determined whether or not the determination condition regarding the current value is a certain value or more.

  As described above, according to the present embodiment, the information related to the use condition is detected by the detection unit 12, and the drive control unit 10 changes the drive pulse according to the use condition that is the detection result. By applying the drive pulse to each electrode in the display panel 1, wall charges that cause erroneous display can be well adjusted according to changes in physical properties of the display panel 1, and more appropriate. Driving can be realized. Therefore, for example, it is possible to surely prevent discharge in a cell to be lit in the display panel 1 and further prevent discharge in a cell that should not be lit, thereby preventing erroneous display on the plasma display. The trouble can be avoided.

Hereinafter, effects obtained when the above-described various drive pulse changing processes are performed in the reset period, address period, and sustain period of the plasma display will be described.
(Reset period)
-By changing the slope of the inclined wave (blunt wave), the weak discharge intensity can be adjusted, and subsequent erroneous addressing can be prevented.
-The wall charge amount can be adjusted by changing the time of the inclined wave (blunt wave).
-The wall charge can be stably adjusted by changing the number of resets (for example, the above-described additional reset period) or adding, deleting, and adjusting the phase of the reset pulse in the upper, lower, left, and right adjacent lines (electrodes). .
(Address period)
By changing the pulse width of at least one of the scan pulse and the address pulse, erroneous addressing can be prevented.
-Error addressing can be prevented by adjusting the phase of the scan pulse and the address pulse.
The wall charges can be stably adjusted by adding, deleting, and adjusting the phase of address pulses in adjacent lines (electrodes) in the vertical and horizontal directions.
(Sustained discharge period)
-It is possible to prevent erroneous discharge and non-lighting by changing the pulse width of the sustain pulse.
-The sustain discharge can be adjusted by adjusting the slope and phase of the sustain pulse.
・ Stable adjustment of wall charge can be performed by adding and deleting sustain pulses.
(Other)
-Excessive lighting and non-lighting can be suppressed by adding and deleting drive pulses before or after the sustain discharge period.
The wall charge can be stably adjusted by adding, deleting, and adjusting the phase of the driving pulse in the adjacent lines (electrodes) in the vertical and horizontal directions before or after the sustain discharge period.

The above-described embodiments are merely examples of implementation in carrying out the present invention, and the technical scope of the present invention should not be construed as being limited thereto. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.
Various aspects of the present invention will be described below as supplementary notes.

(Appendix 1) A plurality of first electrodes and a plurality of second electrodes are arranged in parallel to each other, and a plurality of third electrodes are arranged so as to intersect with the first and second electrodes. A display unit;
A drive control unit that changes a drive pulse applied to each electrode of the display unit according to usage conditions;
A drive unit that applies a drive pulse to each electrode of the display unit based on an instruction from the drive control unit;
The plasma display according to claim 1, wherein the drive control unit performs at least one of addition and deletion of the drive pulse according to the use condition.
(Supplementary note 2) The plasma display according to supplementary note 1, wherein the drive control unit changes a pulse shape of the drive pulse in accordance with the use condition.
(Additional remark 3) The said drive control part changes at least one of the pulse width and phase of the said drive pulse according to the said use condition, The plasma display of Additional remark 1 characterized by the above-mentioned.
(Additional remark 4) The said drive control part changes the inclination of the said driving pulse according to the said use condition, when the said driving pulse is a gradient wave, The plasma display of Additional remark 1 characterized by the above-mentioned.
(Additional remark 5) The said drive control part changes the voltage value of the said drive pulse according to the said use condition, The plasma display of Additional remark 1 characterized by the above-mentioned.
(Supplementary Note 6) The use condition includes at least one of a use time, a use temperature, and a current value of a driving pulse applied to each electrode of the display unit or the non-display unit according to the plasma display. The plasma display according to appendix 1.
(Supplementary note 7) The plasma display according to supplementary note 1, wherein the use condition includes at least one of a power supply time to the plasma display and an actual display time in the display unit.
(Supplementary note 8) The plasma display according to supplementary note 1, wherein the use condition includes at least one of an actual use environment temperature of the plasma display and a panel temperature of the display unit.
(Supplementary note 9) The use conditions include: a current value of a drive pulse applied to each electrode of a display area for displaying a display image on the display section; and a non-display area different from the display area in the display section. The plasma display according to appendix 1, wherein the plasma display includes at least one of current values of drive pulses applied to the electrodes.
(Additional remark 10) The plasma display of Additional remark 1 characterized by further providing the detection part which detects the information which concerns on the said use condition in the said plasma display.
(Supplementary note 11) The plasma display according to supplementary note 1, wherein the drive control unit has a plurality of types of drive pulses as the change pattern of the drive pulse.
(Supplementary Note 12) The drive control unit includes a storage unit that stores a plurality of types of drive pulses;
The plasma display according to claim 1, further comprising a drive pulse instruction unit that selects a plurality of types of drive pulses stored in the storage unit according to the use conditions and instructs the drive unit.
(Supplementary note 13) The plasma display according to supplementary note 1, wherein the plasma display is an AC drive type plasma display.
(Supplementary Note 14) A plurality of first electrodes and a plurality of second electrodes are arranged in parallel to each other, and a plurality of third electrodes are arranged so as to intersect with the first and second electrodes. A driving method of a plasma display having a display unit,
A driving pulse changing step for changing a driving pulse applied to each electrode of the display unit according to the use conditions of the plasma display;
A driving step of applying a driving pulse to each electrode of the display unit based on the result of the driving pulse changing step;
In the driving pulse changing step, at least one of addition and deletion of the driving pulse is performed according to the use condition.
(Supplementary Note 15) In the drive pulse changing step, at least one of the pulse shape, pulse width, phase, drive pulse slope, and drive pulse voltage value of the drive pulse is changed according to the use conditions. 15. The method for driving a plasma display according to appendix 14, wherein:
(Supplementary Note 16) The supplementary note 14, wherein the use condition includes at least one of a use time, a use temperature, and a current value of a driving pulse applied to each electrode of the display unit, according to the plasma display. Driving method of plasma display.
(Supplementary note 17) The plasma display driving method according to supplementary note 14, wherein the plasma display is an AC drive type plasma display.

It is a figure which shows the structural example of the plasma display by embodiment of this invention. It is a figure which shows the structural example of the driver control part shown in FIG. It is a figure which shows the cross-sectional structure of the cell Cij of the i-th row | line | column j which is 1 pixel. It is a figure which shows the structure of the drive circuit of the plasma display shown in FIG. It is a block diagram of 1 frame FR of an image. It is a wave form diagram which shows the basic operation | movement of the plasma display shown in FIG. It is a figure which shows an example of the waveform diagram at the time of adding a drive pulse. It is a figure which shows the other example of the waveform diagram at the time of adding a drive pulse. It is a figure which shows an example of the waveform diagram at the time of deleting a drive pulse. It is a figure which shows an example of the waveform diagram at the time of changing the pulse shape of a drive pulse. It is a figure which shows an example of the waveform figure at the time of changing the pulse width and phase of a drive pulse. It is a figure which shows an example of the waveform figure at the time of changing the inclination of a drive pulse. It is a figure which shows an example of the waveform diagram at the time of changing the voltage value of a drive pulse. It is a flowchart which shows an example of the drive pulse change operation | movement with the plasma display in this embodiment. It is a flowchart which shows the other example of the change operation | movement of the drive pulse in the plasma display in this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display panel 2 Display area 3 Non-display area 4 X side common driver 5 Y side scan driver 6 Y side common driver 7 Address driver 8 Logic part 9 Luminance / power control part 10 Driver control part 11 Display data control part 12 Detection part

Claims (2)

A plurality of first electrodes and a plurality of second electrodes arranged in parallel with each other, and a plurality of third electrodes arranged so as to intersect with the first and second electrodes,
A drive control unit that changes a drive pulse applied to each electrode of the display unit according to usage conditions;
A drive unit that applies a drive pulse to each electrode of the display unit based on an instruction from the drive control unit;
The drive control unit according to the data corresponding to the temperature of the display unit, and a sustain discharge period and the reset period and the address period after the end of the sustain discharge period in one subfield having in this order, the reset period An additional reset period for applying a drive pulse having the same waveform as the drive pulse applied to is added to add the drive pulse to be applied to the second electrode, or no additional reset period is added. A plasma display characterized by controlling the drive unit as described above. The plurality of first electrodes and the plurality of second electrodes are arranged in parallel to each other, and the plurality of third electrodes have a display unit arranged to intersect the first and second electrodes. A plasma display driving method,
A driving pulse changing step for changing a driving pulse applied to each electrode of the display unit according to the use conditions of the plasma display;
A driving step of applying a driving pulse to each electrode of the display unit based on the result of the driving pulse changing step;
In the drive pulse changing step, after the end of the sustain discharge period in one subfield having the reset period, the address period, and the sustain discharge period in this order, according to the data corresponding to the temperature of the display unit , A drive pulse applied to the second electrode is changed by adding or not adding a new additional reset period for applying a drive pulse having the same waveform as the drive pulse applied during the reset period. A method for driving a plasma display.

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