JPH11282417A - Driving method for plasma display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the driving method of a PDP device capable of surely preventing the useless display of images at the time of an initial operation when applying the power supply or the like. SOLUTION: In a step S5, the inactive data of 'L' are successively shifted and inputted to a shift register for a scanning driver and all scanning information is turned to 'L'. In the step S6, all image information for write stored in the shift register 3 for a write driver is set to the image information for indicating a gradation 0. In the step S7, the image information based on video signals SV are stored in a memory cell 6 synchronized with synchronizing signals SYNC after stable-input confirmation. When the processings of the steps S5-S7 are ended, shift to normal write and display operations are performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving method of a plasma display device, and more particularly to a driving method at the time of initialization.

[0002]

2. Description of the Related Art Plasma display panels (PDPs)
In a conventional PDP device having a configuration, at the time of initialization such as when power is turned on, a storage element for temporarily storing a video signal, a write driver shift register connected to a write driver, and a scan connected to a scan driver An appropriate initial operation has not been performed on a storage unit such as a driver shift register.

[0003]

For this reason, the conventional PD
In the P device, at the time of initialization such as when the power is turned on, the period from when the initialization is started to when an image for one screen based on an actually input video signal is displayed on the PDP is stored in the storage unit described above. There is a problem that the contents become unstable, and the indefinite contents in the storage unit are displayed on the PDP as meaningless images.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a method of driving a PDP device capable of reliably preventing meaningless images from being displayed during an initial operation such as when power is turned on. With the goal.

[0005]

According to a first aspect of the present invention, there is provided a method for driving a plasma display device during an initial operation such as turning on a power supply, and the plasma display device is stored in a plasma display panel during a display operation. A plasma display panel that performs display based on the image information, a temporary storage unit that receives a video signal and can store image information based on the video signal for at least one screen of the plasma display panel, and corresponds to each row of the plasma display panel. Scan information storage means for storing scan information instructing selection / non-selection, display row selection means for selecting a display row to be written based on the scan information in an active state, and the plasma display Stores one line of image information for writing to the panel And writing the image information storage means that,
In the active state, the display row selecting means comprises image information writing means for writing the write image information in each row of the plasma display panel selected, the driving method of the plasma display device, (a) the display row selecting means Inactive, and writing a plurality of pieces of information all instructing non-selection to the scan information storage means as the scan information; and (b) storing image information based on the video signal in the temporary storage means. When,
(c) After the steps (a) and (b), predetermined scan data is provided to the scan information storage means, and the image information stored in the temporary storage means is sequentially stored in the write image information storage in display row units. And activating the display row selecting means and the image information writing means to sequentially execute a normal erasing operation, a writing operation and a display operation.

According to a second aspect of the present invention, there is provided a driving method of a plasma display device, wherein (d) before the step (c), deactivate the image information writing means so as to instruct one line for indicating an image of gradation 0. The method further comprises the step of writing image information as the writing image information in the writing image information storage means.

The step (b) in the plasma display apparatus according to the third aspect includes: (b-1) a step of confirming a stable input of a synchronization signal of the video signal; and (b-2) the step (b-1). ), When the stable input of the synchronization signal is confirmed,
Storing the image information based on the video signal in the temporary storage means.

The plasma display device according to claim 4, wherein (e) prior to the step (c), the image information writing means and the display row selecting means during the erasing operation, the writing operation and the display operation, respectively. The method further comprises the step of setting a voltage setting condition of a high power supply voltage to be applied to the image information writing unit, wherein the step (c) sets a high power supply voltage based on the voltage setting condition set in the step (e). The erase operation, the write operation, and the display operation are performed by being applied to the display row selection unit.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS <PDP Device as Premise> FIG. 1 is a block diagram showing a configuration of a PDP device used in a driving method at the time of initialization of a PDP device according to an embodiment of the present invention.

As shown in FIG. 1, the PDP 1 performs display based on image information stored in a plurality of rows during a display operation.

A write driver 2 and a scan driver 4 are connected to the PDP 1. The write driver 2 is a high voltage power supply 7
A higher voltage is applied, controlled by the drive signal of the drive signal output unit 17 of the control circuit 10, and the write image information for one display row stored in the write driver shift register 3 is stored in the scan line of the scan driver 4. Write to the row of the active PDP1.

The scan driver 4 is supplied with a high voltage from the high voltage power supply 7, is controlled by a drive signal of a drive signal output unit 17 of the control circuit 10, and operates on the PDP 1 based on scan information stored in the scan driver shift register 5.
Are selectively activated in a plurality of scan lines provided corresponding to the display row of.

The control circuit 10 comprises a reset circuit 12, a synchronization signal control unit 13, an initial operation control unit 14, a clock oscillation unit 15, a sequence control unit 16, and a drive signal output unit 17, and is lower than the control low-voltage power supply 11. Voltage.

A low voltage is applied to the control circuit 10 upon power-on from the control low-voltage power supply 11. Reset circuit 12
Raises the control system reset CRST from "L" to "H" at a predetermined time constant when a low voltage is supplied from the control low-voltage power supply 11. Synchronization signal controller 13, initial operation controller 14
The sequence control unit 16 is activated when the control system reset CRST is “H”.

The clock oscillating unit 15 receives the synchronizing signal SYNC of the video signal SV, and synchronizes the control system clock CLK with the synchronizing signal SYNC to output the synchronizing signal control unit 13, the initial operation control unit 14, the sequence control unit 16, and the drive signal output. Part 17
Give to. Synchronization signal control unit 13, initial operation control unit 14,
The sequence control unit 16 and the drive signal output unit 17 execute a predetermined operation in synchronization with the control system clock CLK in the active state.

The synchronizing signal controller 13 receives the synchronizing signal SYNC, performs noise removal processing and invalidation processing (when an unnecessary synchronizing signal is input) of the synchronizing signal SYNC in the active state, and outputs the same to the sequence controller 16. .

The initial operation control unit 14 controls an initial operation by supplying a control signal to the sequence control unit 16 in the active state. For example, a control signal instructing an initial writing operation of the video signal SV to the storage element 6 based on the synchronization signal SYNC is supplied to the sequence control unit 16.

The initial operation control section 14 supplies a drive system reset DRST to the drive signal output section 17 to control the activation / inactivation of the drive signal output section 17.

The sequence controller 16 outputs a write clock WT, a gate signal BLK, scan data XD, and a scan clock XT in synchronization with a synchronization signal SYNC obtained via the synchronization signal controller 13. By outputting a control signal to the drive signal output unit 6 and a control signal to the drive signal output unit 17, the initial operation based on the control signal of the initial operation control unit 14 and the general general operation are controlled.

The sequence controller 16 sets voltage conditions for the high-voltage power supply 7 during the erasing, writing, and sustain periods (display periods) based on the control signal from the initial operation controller 14. Based on the initial operation end signal, a control signal instructing the start of the rise of the high voltage power supply 7 is output to the high voltage power supply 7 and a rise confirmation signal from the high voltage power supply 7 is received.

The drive signal output unit 17 is provided with a drive system reset D
Activation / inactivation is controlled by the RST, and the write driver 2 or the scan driver 4 is controlled based on a control signal from the sequence control unit 16 in the active state.

The storage element 6 converts the video signal SV into at least P
One frame of DP1 is temporarily stored, and the stored image information is output based on a control signal of the sequence control unit 16.

The AND gate G1 receives the image information from the storage element 6 and the gate signal BLK. When the gate signal BLK is "L", the image information of "0" (black, gradation 0) is
At the time of “H”, the image information obtained from the storage element 6 is output to the write driver shift register 3.

The write driver shift register 3 sequentially shift-inputs image information obtained from the output of the AND gate G1 in synchronization with the write clock WT, and stores the write image information.

The scan driver shift register 5 receives the scan data XD and the scan clock XT.
The scan data XD is stored as scan information corresponding to a plurality of display rows of the PDP 1 while being shifted and input by the scan clock XT.

<Driving Method> FIGS. 2 and 3 are a flowchart and a timing chart, respectively, showing a driving method at the time of initialization of the PDP device according to the embodiment of the present invention. Hereinafter, the driving method according to the embodiment will be described with reference to FIGS. In FIG. 3, for convenience, the synchronization signal SYNC pulse generation interval is illustrated differently between the initial operation and the normal operation. However, in actuality, the pulse generation of the synchronization signal SYNC between the initial operation and the normal operation is performed. The intervals are equal.

First, in step S1, the control low-voltage power supply 11
Is supplied, and the low power supply voltage is supplied to the control circuit 10.

Then, in step S2, the reset circuit 1
2 rises from "L" to "H" of the control system reset CRST (see FIG. 3), the reset state is released, and the synchronization signal control unit 13, the initial operation control unit 14, and the sequence control unit 16 are activated. Become.

Thereafter, in step S3, under the control of the sequence control unit 16 based on the control signal of the initial operation control unit 14, the voltage setting conditions and the PDP 1 in the erasing, writing, and sustaining periods of the high voltage from the high voltage power supply 7 operate. Various conditions such as the mode (frequency, etc.) to be performed, the number and order of subfields are set.

Then, in step S4, the synchronization signal SYN
When the confirmation process of C is performed and the synchronization signal SYNC has not been input or is unstable, the process does not proceed from step S4, and the process proceeds to step S5 and thereafter only after the stable input of the synchronization signal SYNC is confirmed. .

In step S5, the sequence control section 16 fixes the scan data XD to "L" and generates the scan clock XT a predetermined number of times, so that the scan driver shift register 5 stores the "L" inactive data. Are sequentially shifted and all the scan information is set to "L".

In step S6, the sequence control section 16 fixes the gate signal BLK at "L" and generates the write clock WT a predetermined number of times, so that the AND gate G1 outputs "L" (gray level 0) image information. Are sequentially input to the write driver shift register 3 so that all the write image information stored in the write driver shift register 3 is set to image information indicating the gradation 0.

In step S7, under the control of the sequence control section 16, at least the PDP stores image information based on the video signal SV in the storage element 6 in synchronization with the synchronization signal SYNC.
One frame is stored.

In step S7, in step S4, the synchronization signal S
This is executed after the stable input of YNC is confirmed. Therefore, by storing the image information based on the video signal SV in the storage element 6 at the time of stable input of the synchronization signal SYNC, accurate image information based on the video signal SV is stored. It can be stored in the element 6. In the example of FIG. 3, the storage element 6 stores image information based on the video signal SV for four frames.

The procedures of steps S5 to S7 are not the same, and can be executed in parallel.

When the processing of steps S5 to S7 is completed,
In step S8, the sequence control unit 16 outputs a control signal for instructing the startup of the high-voltage power supply 7 to the high-voltage power supply 7 by using the initialization end signal of the initial operation control unit 14 as a trigger. Check whether or not
When the rise is confirmed, the processing shifts to the processing after step S9.

In step S9, a normal sequence operation performed after the initial operation is started. First, the gate signal BLK becomes “H”, and image information can be shifted from the storage element 6 to the write driver shift register 3.

Next, at step S10, the drive signal output unit 1
7 completes the preparation of the output of the drive signal (setting of the output waveform, etc.) based on the control signal of the sequence control unit 16.

Then, in step S11, the initial operation control section 14 outputs a drive system reset DRST for instructing the active state to the drive signal output section 17 to make the drive signal output section 17 active. The drive signal output unit 17 in the active state
Supplies a drive signal to the write driver 2 and the scan driver 4 to drive the write driver 2 and the scan driver 4 to execute an erase operation and a subsequent write operation. At this time, based on the voltage setting conditions set in step S3, a high voltage is applied from the high voltage power supply 7 to the write driver 2, the scan driver 4, and the like, and the erase operation and the write operation are performed.

At this time, since all the scan information of the scan driver shift register 5 is set to the inactive data, the normal scan data XD of “H” during the normal sequence operation is shifted and input. Erroneous write processing is not performed by erroneously activating the scan line. Therefore, the following inconvenience does not occur.

At the time of writing after the erasing operation, once the image information in the light emitting state (not the non-light emitting state) is written into the PDP 1, a high voltage (about 300 V) called an erasing pulse is applied to the counter electrode at the next erasing operation. Unless a pulse is input to the switch, a non-light-emitting state does not occur. Therefore, if “H” is erroneously stored in any of the scan driver shift registers 5 before input of the normal scan data, the write driver 2 writes the write data written in the write driver shift register 3. The scan image information (fake image information) is written into a row corresponding to the scan line (error write line) that is erroneously set to “H” by the scan driver 4.
Thereafter, the display image corresponding to the error writing line is displayed based on the information obtained by combining the false image information and the normal image information as a result of writing the normal writing image information also in the line corresponding to the error writing line. This causes a problem that an image whose quality has been significantly deteriorated is displayed.

On the other hand, since all the write image information of the write driver shift register 3 is set to image information of gradation 0 during the initial operation, the write clock WT is set in advance in the normal operation after the initial operation. Even when only a predetermined number of pulse inputs or less are executed, writing to the PDP 1 with random image information is reliably avoided, and image information of gradation 0 is written to a part of the PDP 1.

In the above case, black vertical stripes are displayed on the PDP 1, but the required power is minimized as compared with the case where an image is displayed based on random image information, and a power supply and a driving circuit are not required. Unnecessary heat generation can be reliably prevented.

If the random image information indicates a very bright gradation and the entire screen is dark, there is a risk that unnecessary stress may be applied to the front panel (glass) of the PDP 1, but the danger is also ensured. Can be prevented.

Further, after the image information is completely stored in the PDP 1 in the storage element 6, the gate signal BLK is set to "H" to shift and input the image information from the storage element 6 to the write driver shift register 3. Therefore, the image information correctly stored in the storage element 6 is not PDP
Written to 1.

Then, in step S12, an image based on the image information stored in the storage element 6 is displayed on the PDP 1. At this time, based on the voltage setting conditions set in step S3, a high voltage is applied from the high voltage power supply 7 to the write driver 2, the scan driver 4, and the like.

In step S13, the synchronization signal SYNC is confirmed. If the synchronization signal SYNC has not been input, the process does not proceed from step S13. If the input of the synchronization signal SYNC is confirmed, the drive system reset DRST is deactivated. Then, the processing shifts to the processing after step S9.

Thereafter, the processing of steps S9 to S13 is repeated, and the normal sequence operation is continuously executed.

As described above, in the driving method of the plasma display device according to the embodiment, by performing the processing of steps S5 and S7 at the time of the initial operation, an image is displayed by the display operation of step S13, and the meaningless display is performed on the PDP 1. Is reliably avoided.

<Effect of Voltage Setting Condition> FIG.
FIG. 9 is an explanatory diagram showing an effect obtained by executing the high power supply voltage application performed in steps S11 and S12 based on the voltage setting condition set in FIG. As shown in the drawing, the output of the write driver 2 needs to be set to about 100 V during the erase period, and to about 50 V during the write period.
Further, the output of the scan driver 4 needs to be set to about -150 V during the writing period and to about 150 V during the sustaining period. Further, the output of the counter driver (not shown in FIG. 1) to the counter electrode facing the electrode receiving the output of the scan driver 4 needs to be set to about 300 V during the erase period and to about 150 V during the sustain period.

If the setting of the high voltage condition is neglected, for example, the following problems occur.

Light emission does not occur unless the output of the scan driver 4 and the output of the opposite driver are set to about 150 V during the sustain period.

During the writing period, the output of the write driver 2 is set to about 50 V, and the output of the scan driver 4 is set to about-
Unless it is set to 150 V, normal writing cannot be performed.

Unless the output of the writing driver 2 is set to about 100 V and the output of the opposing driver is set to about 300 V during the erasing period, previously written information cannot be accurately updated by the subsequent writing operation.

The output of the opposing driver during the erasing period is about 3
If the output of the write driver 2 is not set to about 100 V even though it is set to 00 V, the write driver 2 receives a high voltage exceeding its withstand voltage, and the write driver 2 is damaged.

In order to surely solve such a problem,
In step S3 at the time of the initial operation, the voltage conditions for the high-voltage power supply 7 are set.

[0057]

As described above, in the driving method of the plasma display device according to the first aspect of the present invention, in the step (a) performed prior to the step (c),
Since the display row selection unit is in an inactive state and a plurality of pieces of information all instructing non-selection are written as scan information in the scan information storage unit, in step (c),
Until the regular scan data instructing the selection is input to the scan information storage means, the writing process to the plasma display panel will not be erroneously performed.

In step (b) performed prior to step (c), image information based on the video signal is stored in the temporary storage means. Image information correctly stored in the storage means is written to the plasma display panel.

As a result, it is possible to reliably avoid meaningless display on the plasma display panel on which an image is displayed in a display operation after a normal writing operation.

According to a second aspect of the present invention, in the driving method of the plasma display device, in the step (d) performed prior to the step (c), the image information writing means is deactivated before the step (c); Since the image information for one line instructing the image of the gradation 0 is written in the writing image information storage means as the writing image information, step (c)
In this case, even if the writing image information in the writing image information storage means cannot be completely rewritten, the image information of gradation 0 is written to a part of the plasma display panel.

The image information of gradation 0 minimizes the power required for display, and there is a danger that stress will be applied to the surface glass of the plasma display panel no matter what screen is displayed on the plasma display panel. Therefore, the inconvenience when the rewriting of the writing image information in step (c) is incomplete can be minimized.

The step (b-2) in the method for driving a plasma display device according to the third aspect is the step (b-1).
When the stable input of the synchronization signal is confirmed in, the image information based on the video signal is stored in the temporary storage means. The signal can always be accurately stored in the temporary storage means.

The step (e) in the method for driving a plasma display device according to the fourth aspect is the step of setting a high voltage to be applied to the image information writing means and the display row selection means during the erasing operation, the writing operation and the display operation. Step (c), the erase operation by applying a high power supply voltage based on the voltage setting conditions set in step (e) to the image information writing means and the display row selection means, respectively,
Steps for performing write and display operations
The erase operation, the write operation, and the display operation in (c) can be executed accurately.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a PDP device used in a method of driving a PDP device according to an embodiment.

FIG. 2 is a flowchart illustrating a driving method of the PDP device according to the embodiment of the present invention.

FIG. 3 is a timing chart showing a driving method of the PDP device according to the embodiment of the present invention.

FIG. 4 is an explanatory diagram for describing effects of the embodiment.

[Explanation of symbols]

1 PDP, 2 write driver, 3 shift register for write driver, 4 scan driver, 5 shift register for scan driver, 6 storage element, 7 high voltage power supply,
10 control circuit, 11 low voltage power supply for control.

Claims (4)

[Claims] 1. A driving method of a plasma display device performed at an initial operation such as power-on, wherein the plasma display device receives a video signal and receives a video signal. Temporary storage means capable of storing image information based on at least one screen of the plasma display panel, and scan information storage means provided corresponding to each row of the plasma display panel and storing scan information for instructing selection / non-selection. A display row selecting means for selecting a row to be written based on the scan information in an active state; a write image information storage means for storing one row of write image information to be written to the plasma display panel; Sometimes, the writing is performed on the line selected by the display line selecting means. Image information writing means for writing image information for, (a) deactivating the display row selection means, all the information instructing non-selection to write the scan information as the scan information in the scan information storage means, (b) storing image information based on the video signal in the temporary storage means, and (c) after the steps (a) and (b), giving predetermined scan data to the scan information storage means, The image information stored in the temporary storage means is sequentially applied to the writing image information storage means in display row units, the display row selection means and the image information writing means are activated, and a normal erasing operation, writing operation and A driving method for a plasma display device, comprising the steps of: sequentially executing a display operation. 2. (d) Prior to the step (c), the image information writing means is deactivated, and one line of image information indicating an image of gradation 0 is written as the writing image information. 2. The driving method for a plasma display device according to claim 1, further comprising the step of writing the image information in a storage unit. 3. The step (b) comprises: (b-1) a step of confirming a stable input of a synchronization signal of the video signal; and (b-2) a step of: stabilizing the synchronization signal in the step (b-1). And storing the image information based on the video signal in the temporary storage unit when the input is confirmed.
Alternatively, the driving method of the plasma display device according to claim 2. 4. The voltage of a high power supply voltage applied to each of the image information writing means and the display row selection means during the erasing operation, the writing operation, and the display operation before the step (c). The method further comprises the step of setting a setting condition, wherein the step (c) provides a high power supply voltage based on the voltage setting condition set in the step (e) to the image information writing unit and the display row selection unit, respectively. 4. The method according to claim 1, wherein the erasing operation, the writing operation, and the display operation are performed by performing the erasing operation, the writing operation, and the display operation. 5.