JPH0535206A - Display device driving method and device thereof - Google Patents

Abstract

(57) [Abstract] [Object] A driving method of a display device for driving and controlling a display device such as a plasma display, and more particularly, a driving method of a display device driven and controlled by a batch writing method. It is an object to propose a driving method of a display device having an erasing characteristic. According to the present invention, a plurality of display cells are divided into a plurality of display areas, and an erase pulse is applied to another display area while a write pulse is applied to one display area. The period from the application of the write pulse applied to each of the plurality of display regions to the application of the erase pulse sequentially applied is shortened, the erase characteristic is made uniform as much as possible, and the rewrite speed is increased. Further, since the write pulse is applied at different timings for each of the plurality of divided display areas, noise generation is suppressed and the peak current value is suppressed to reduce the capacity of the power supply.

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 display device for driving and controlling a display device such as a plasma display,
In particular, the present invention relates to a driving method of a display device that is drive-controlled by a batch writing method.

[0002]

2. Description of the Related Art Conventionally, there are a line-sequential scanning method and a collective writing method as a driving method of a display device of this type. In the line-sequential scanning method, a plurality of scan electrodes connected to a plurality of display cells are line-sequentially scanned one by one on the basis of display data transferred from the outside, and writing / erasing operations are performed line-sequentially. This is a driving method for selectively displaying. Since this line-sequential scanning method scans a plurality of scanning electrodes line-sequentially, there is a limit in the screen rewriting speed per screen and also in the high speed rewriting.

In the batch writing method, a write pulse is once applied to the entire screen, and after batch writing, selective display is performed by an erase pulse and an erase cancel pulse. That is, a simultaneous write pulse is applied to all the horizontal electrodes of a display panel in which a plurality of display cells are arranged in a matrix, and after batch writing, erase pulses are sequentially and continuously applied to all the horizontal electrodes. To do. Further, by applying an erase cancel pulse to the vertical electrode to which the display cell to be displayed is connected among the vertical electrodes of the display panel to bring it into a selective write state, and then applying a sustain pulse, a predetermined display emission brightness is obtained. obtain.

[0004]

Since the conventional driving method of the display device is configured as described above, the line-sequential scanning method cannot perform high-speed rewriting and the batch writing method. Has the following problems.

First, the period from the application of the write pulse applied collectively to each horizontal electrode to the application of the erase pulse sequentially applied to each horizontal electrode is the position of the horizontal electrode (display cell). Therefore, uniform erase characteristics cannot be obtained for the display cells of the entire screen. This will be explained with reference to FIG. 6. Since the application timing of the erase pulse is different, the periods T ₁ , T ₂ , T ₃ from the application of the write pulse to the application of the erase pulse are different. Since the wall charges are gradually attenuated during the different periods T ₁ , T ₂ , and T ₃ , the residual wall charges when the erase pulse is applied are different depending on the position of the display cell. Thus, as a result of the erase conditions change, in a sustain time, Y _b -X _i, horizontal Y _c -X _i - and it can not be performed is uniform erase operation display cell specified by the electrodes of the vertical Become. Wherein at the Y _b display cell specified by -X _i is possible substantially erasing operation, and shows a state that is not be erased at all the display cells specified by Y _c -X _i.

Secondly, when a write pulse is applied all at once, an excessive current flows and noise easily occurs, and a large power supply capable of supplying a peak current is required. Thirdly, a method of dividing a plurality of display cells into a plurality of areas and performing full writing and continuous erasing in each area is conceivable, but the number of write operations due to the area division increases and the rewriting speed decreases.

The present invention has been made to solve the above problems, and an object of the present invention is to propose a method of driving a display device having a uniform rewriting characteristic with a high rewriting speed.

[0008]

According to a method of driving a display device of the present invention, a write pulse, an erase pulse, and an erase cancel pulse are applied to a plurality of display cells arranged in a matrix and specified by the erase cancel pulse. In a method of driving a display device in which any display cell is selected and driven and displayed by the write pulse, the plurality of display cells are divided into a plurality of arbitrary display areas, and the entire one divided display area is displayed. The erase pulse is applied to the entire other display area while the write pulse is being applied.

[0009]

In the present invention, the plurality of display cells are divided into a plurality of display areas, and while the write pulse is applied to one display area, the erase pulse is applied to the other display area. The period from the application of the write pulse applied to each of the plurality of display regions to the application of the erase pulse sequentially applied is shortened, the erase characteristic is made uniform as much as possible, and the rewrite speed is increased. Further, since the write pulse is applied at different timings for each of the plurality of divided display areas, noise generation is suppressed and the peak current value is suppressed to reduce the capacity of the power supply.

[0010]

【Example】

a) First Embodiment of the Present Invention A first embodiment of the present invention will be described below with reference to FIGS. 1 (A) and 1 (B).

The driving method of the display device according to this embodiment is horizontal.
Scan electrode Y_a, Y_bThis horizontal scanning electrode is divided into regions
Y_aThe erase pulse is applied to the
Pole Y _bSustain pulse and write
Apply loose. Further, the vertical signal electrode X_aIs 0V (G
ND) level signalless state is maintained and X_bTo
Applies an erase cancel pulse.

[0012] The application of the respective signals, combined drive waveform Y _a -X _a applied to the display cell C1 has a waveform including a sustain pulse and the erase pulse, the display cell C1 emission is eliminated. Composite drive waveform Y applied to display cell C2
_a− X _b has a waveform including a sustain pulse and a signal in which the erase pulse is canceled by the erase cancel pulse,
The display cell C2 maintains the previous state and remains emitting light or not emitting light. Composite drive waveform Y _b applied to the display cell C3
-Xa has _a waveform including the sustain pulse and the write pulse (including the sustain pulse), and the display cell C3 performs the write operation. The combined drive waveform Y _b -X _b is applied to the display cell C4, the write operation is performed.
That is, the write operation can be performed on the display cells C3 and C4 at the same time as the erase / maintain operation of the display cells C1 and C2.

B) Second Embodiment of the Invention A second embodiment method will be described with reference to FIGS. 2 and 3. The driving method of the display device according to the second embodiment is such that the plurality of horizontal scanning electrodes Y _{a1 to} Y _bn of the plasma display 1 are divided into two and divided into two display cell groups A and B, and the display cells are While the erase pulse is being applied to the plurality of horizontal scan electrodes Y _{a1 to} Y _an of the group A (or B), the writing pulse is applied to the plurality of horizontal scan electrodes Y _{b1 to} Y _bn of the other electrode group B (or A). And the vertical signal electrodes X _a and X of the display cell groups A and B, respectively.
By selectively applying an erase cancel pulse to _b ..., The display cells C1, C2 to Cn are selectively light-emitted and drive-controlled.

Next, the method of this embodiment will be described in detail with reference to the operation timing chart shown in FIG. An erase pulse is sequentially applied to the horizontal scan electrodes Y _{a1 to} Y _bn of the display cell group A, and at the same time, a common sustain pulse is applied to the horizontal scan electrodes Y _{b1 to} Y _{bn of} the display cell group B followed by a write pulse at the same timing. Apply with. At this time, the vertical signal electrodes X _a of the display cell groups A and B maintain the GND state, and the vertical signal electrodes X a
_An erase cancel pulse is continuously applied to _b . Wherein a column示波form on behalf on each display cell C _aa1 -C _BBN each signal is applied _{Y a -X a, Y a -X} b, Y b -X a,
Composite waveform such as Y _b -X _b is to be applied.

[0015] Of the combined drive waveforms each display cell C _aa1 -C _BBN applied, for display cell C _aa1 -C _abn in the display cell group A, display cells are connected to the vertical signal electrode X _a C _aa1 since the -C _aan driving waveform of the Y _a -X _a are applied erased continuously, the display cell C _ab1 -C _abn connected to the vertical signal electrodes X _b Y _a -X
_Since the drive waveform of _b is applied, the current state (written state or erased state) is maintained without being erased.

The display cell C in the display cell group B
_ba1 -C For _bbn, Y _a -X _a or Y _a -X _b
Since the drive waveform is applied, the write state can be set irrespective of the vertical signal electrodes _Xa and _Xb .

Further, after the above operation is completed, the display cell group A
To the plasma by continuously applying the sustain pulse and the write pulse from the horizontal scan electrodes Y _{a1 to} Y _an and applying the erase pulse to the display cell group B from the horizontal scan electrodes Y _{b1 to} Y _bn. complete rewrite operation to the entire screen of the display 1, so that the light emission to the predetermined luminance required to display each display cell C _aa1 -C _BBN by continuous application of sustain pulses thereafter.

[0018] As described above, the more cells C _aa1 -C _BBN to the plasma display and bisected on the basis of the horizontal scan electrodes, application of the erase pulse from the time of application of the write pulse applied to each horizontal scanning electrodes Time period T is half
Becomes Accordingly, it is possible to be wall charge accumulated in all the display cells C _aa1 -C _BBN is attenuated in a short period T became 1/2, homogenization of the erase operation by minimizing the attenuation of the wall charges can be achieved . In addition, the write pulse is applied to each display cell group A, B.
Therefore, since the application timing is different, the peak current value can be suppressed.

C) Third Embodiment of the Invention A third embodiment method will be described with reference to FIG. In the figure, the driving method of the display device according to the third embodiment is such that all the display cells of the plasma display 1 are divided into three display cell groups A, B,
The display cell group B is divided into regions, a write pulse is applied to the display cell group B while the erase pulse is applied to the display cell group A, and a display pulse is displayed while the erase pulse is applied to the display cell B. Drive control is performed so that a write pulse is applied to the cell group C.

By the drive control according to the method of this embodiment,
For each display cell group B, C (or C), the write pulse is sequentially applied at predetermined intervals without being applied at the same time as the write pulse applied to the display cell group A (or A, B) that is previously scanned. Applied to each display cell group A,
Periods T _A (T _AS , T _AL ) and T _B (T _BS , from application of each write pulse of B and C to application of each erase pulse)
T _BL ) and T _C (T _CS , T _CL ) become shorter. That is, the periods T _A , T _B , and T _C are the periods in the conventional technique (see FIG. 6).
(See the period T ₃ in the middle), it is shortened to one-third, and the attenuation of wall charges accumulated in each display cell can be minimized. Therefore, a uniform erase characteristic can be obtained.

A sustain (sustain) pulse is continuously applied to each of the display cell groups A, B, and C after the write scanning period in which the write pulse and the erase pulse are applied. When the sustain period in which the sustain pulse is applied ends, the one-screen rewriting time is completed.

D) Another embodiment of the present invention Another embodiment of the present invention will be described with reference to FIG. Same figure
In the driving device of the display device according to the present embodiment is a plasma
Horizontal scanning electrodes of display 1 are divided into areas and connected to each other
Multiple Y drivers 2₁, ~, 2_nAnd the Plas
X-Dry to which the vertical signal electrodes of the display 1 are connected
B 3 and each of the Y and X drivers 2₁, ~, 2_nThree
And an operation control circuit 4 for suppressing each of the Y control signals.
Driver 2 ₁, ~, 2_nOne of the Y drivers 2₁(Or 2
₂, ~, 2_n) Are divided into areas and the horizontal scanning electrode display cell
Group 1_A(Or 1_B~ 1_N) And write pulse
While another Y driver 2₂~ 2_nIs one of the areas
Display cell group 1 of horizontal scanning electrodes_B(Or 1_A1
_C~ 1_N) Is applied to the erase pulse.

The operation of the driving device based on the above construction is similar to that of the plasma display 1 divided into a plurality of regions in the embodiment of the present invention. e) Other Embodiments of Each Invention Although the display device is configured as a plasma display in each of the above-mentioned embodiments, a display element such as electroluminescence (EL), light emitting diode (LED), liquid crystal (LCD), etc. It can also be composed of elements.

The area of the display device can be divided into any number, and in particular, the number of write operations by division is minimized on the assumption that uniform erase characteristics can be obtained for the display cells of the entire screen. It is desirable to use a numerical value that is divided into

In each of the above-described embodiments, the sustain period for applying the sustain pulse is collectively applied at the end of one screen rewriting time. However, writing is applied dividedly to each display cell group divided into regions. It is also possible to adopt a configuration in which after applying the pulse, it is applied by being dispersed every several cycles.

The driving method of the erasing operation has been described in the above embodiment in which the selected cell is erased by the combination of the erasing pulse and the erasing cancel pulse. It is also possible to directly apply erase by applying a pulse of polarity and applying an erase pulse combined to the intersecting selected cells.

[0027]

As described above, according to the present invention, a plurality of display cells are divided into a plurality of display areas, and while a write pulse is applied to one display area, an erase pulse is applied to another display area. Since the voltage is applied, the period from the application of the write pulse applied to each of the plurality of display regions to the application of the erase pulse sequentially applied is shortened, the erase characteristic is made uniform as much as possible, and the rewrite speed is improved. Speed up. Also,
Since the write pulse is applied to each of the plurality of divided display areas at different timings, it is possible to suppress noise generation and suppress the peak current value to reduce the capacity of the power supply.

[Brief description of drawings]

FIG. 1 is a diagram showing how a write pulse and an erase pulse are applied to explain a first embodiment of the present invention.

FIG. 2 is a circuit diagram of a plasma display circuit for explaining a second embodiment of the present invention.

3A and 3B are various signal waveform diagrams and timing charts thereof for explaining the operation of the embodiment described in FIG.

FIG. 4 is an operation timing chart for explaining the third embodiment of the present invention.

FIG. 5 is a block circuit configuration diagram for explaining another embodiment of the present invention.

FIG. 6 is an operation timing chart for explaining a problem of a conventional display device driving method.

[Explanation of symbols]

1 ... plasma display _{2 1, ~, 2 n ...} X driver 3 ... Y driver 4 ... operation control circuit X _a, X _b ... vertical signal electrodes _{Y a, Y b, Y a1} , Y a2 ~Y an, Y b1, Y _b2 to Y _bn ... horizontal scanning electrodes C1, C2, C3, C4, C aa1 ~C bbn ... display cell

Claims (3)

[Claims] 1. A driving method of a display device, wherein a plurality of display cells arranged in a matrix form are driven and displayed by selecting an arbitrary display cell specified by a driving pulse including a writing pulse and an erasing pulse. Driving a display device characterized in that a display cell is divided into a plurality of arbitrary display areas, and an erase pulse is applied to another display area while applying a write pulse to the divided one display area. Method. 2. The display device driving method according to claim 1, wherein a sustain pulse for maintaining driving display is applied to the plurality of display regions after selective driving by driving pulses including a writing pulse and an erasing pulse. One drive cycle,
A method of driving a display device, wherein the driving cycle is periodically repeated. 3. A display panel section (1) having a plurality of display cells formed at intersections of a plurality of scanning electrodes and signal electrodes arranged in a matrix, and the display panel section (1). The plurality of scan electrodes 1) are formed to have a plurality of scan drive units (2 ₁ , to 2 _n ) which are divided into one or a plurality of scan electrodes and are connected to the plurality of scan electrodes, and the plurality of scan drive units (2 ₁ , ~ 2 _n ), one of the scan driving units applies a write pulse to the scan electrodes, while the other scan driving unit applies an erase pulse to the scan electrodes. A signal driving unit that is connected to one or more signal electrodes of the display panel unit (1) and selectively applies a selection pulse such as an erase cancel pulse for canceling the erase pulse or an erase pulse of reverse polarity to the signal electrode ( 3) and a drive device for a display device, characterized in that .