JPH08179726A - Plasma display panel - Google Patents

Abstract

PURPOSE: To realize a bright screen by providing two display electrodes for each picture element, and reducing the number of the sub-fields arranged in series of one field by half. CONSTITUTION: In the red part of a picture element 1 constituting a plasma display panel, a red electrode 2 which is a red address electrode, an X1 display electrode 4 and a Y11 display electrode 5 which are a pair of display electrodes on a prescribed position of a first scanning line, and an X2 display electrode 6 and a Y12 display electrode 7 which are a pair of other display electrodes on the other position of the first scanning line are arranged in matrix.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display (PDP) used for a display of an information device or a personal computer, an image display of a television, etc., and particularly, an address / display separation type subfield driving method is used for display. Regarding PDP panel.

[0002]

2. Description of the Related Art A PDP panel is suitable for a large screen display because it has features such as a large screen, a quick response speed, and a wide viewing angle among flat displays. In particular, the AC type PDP panel is a panel having memory characteristics, high efficiency, and long life, and a display device that realizes full-color display with multiple gradations has already been commercialized.

FIG. 4 shows the structure of a conventional PDP panel.
According to the figure, one pixel consists of three RGB stripe cells. A pair of X and Y sustain (discharge sustaining) electrodes are formed on the glass substrate on the display surface side by a transparent electrode and an auxiliary electrode. A dielectric layer is provided on the sustain (discharge sustaining) electrodes, and barrier ribs are formed on the dielectric layer to separate the coupling between the cells. Furthermore, magnesium oxide (Mg
O) Deposit the film. On the other hand, address electrodes are formed on the opposing rear glass substrate. R (red), G (green), B
Stripe-shaped partition walls are provided between the (blue) address electrodes, and R, G, and
The phosphor of B is separately formed. Ne in the discharge space
And a mixed gas of Xe are enclosed.

The above-mentioned PDP panel controls display using a display driving method called an address / display separation type subfield method described below. An example of the driving sequence of the address / display separation type sub-field method of 256 gradation display is shown in FIG. 5 and described with reference to FIG. One frame has a relative luminance ratio of 1, 2, 4, 8, 16, 3
It consists of 8 subfields of 2, 64, and 128,
256 gradations are displayed by combining the brightness of 8 screens.
Each subfield is composed of an address period for writing refreshed data for one screen and a sustain period for determining the brightness level of the subfield.

In the address period, wall charges are initially formed in each pixel at the same time on the entire screen, and then a sustain pulse is applied to the entire screen for display. The brightness of the subfield is proportional to the number of sustain pulses and is set to a predetermined brightness.

Each subfield is composed of an address period and a sustain period, and each address period is 1.5.
It is milliseconds, and the total time of the address period of one frame is 1.5 milliseconds × 8, which is 12 milliseconds. The remaining 4.7 milliseconds of one frame period (about 16.7 milliseconds) is used for the sustain period. Brightness is proportional to the sustain cycle. For example, the subfield: SF1 has two sustain cycles, and the following subfield:
The number of sustain cycles in SF2 is 4 cycles, and the number of sustain cycles in the eighth subfield: SF8 is 25.
6 cycles.

The address method is performed in the following procedure. All screen erase, all screen lit (write discharge) All screen erase, line sequential write address (3 microsecond ×
(480 lines) and the above cycles are repeated.

FIG. 6 shows a drive waveform diagram. In the first full-screen erase, erase discharge of all cells is performed in order not to be affected by the lighting state in the sustain period of the previous subfield. The next full screen lighting (writing discharge) is performed between the X and Y electrodes. At this moment, since the address electrodes are maintained at 0V, some of the ions accumulate on the surface of the phosphor. Furthermore, in full screen deletion,
Unnecessary wall charges are erased at the next write address. In this erase pulse, the wall charges on the surface of the phosphor on the address electrode remain even after the discharge is completed. Finally, line-sequential selective writing is performed. The address discharge between the address electrodes as the Y electrodes is caused by the ions remaining on the surface of the phosphor and the M on the Y electrode side.
The electrons remaining on the gO surface effectively participate in the discharge in the form of being piled up with the externally applied voltage, so that the writing discharge at a very low address voltage becomes possible.

However, as described above, in the address period of the subfield, all the address scans from the first scanning line to the 480th scanning line are performed, and therefore the length of the address period takes 1.5 milliseconds. When the number of subfields is increased for multi-gradation display, the total address period is 1.
It increases from the relation of 5 ms × number of subfields. On the other hand, since the display period is the time obtained by subtracting the total time of the address period from one field (about 16.7 seconds), increasing the number of subfields shortens the sustain (discharge maintaining) period. Therefore, there is a problem that the panel screen becomes darker as the number of subfields is increased and the multi-gradation display is performed.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a plasma display panel having multiple gradations and a bright screen.

[0011]

In order to achieve the above object, a red electrode, a green electrode, and a blue electrode are provided for each of the three primary colors red, green, and blue that constitute each pixel in a direction perpendicular to the scanning line direction. Address electrodes composed of electrodes, first display electrodes composed of X1 electrodes and Y1 electrodes provided at respective positions corresponding to the scanning lines, and X2 electrodes provided at respective positions corresponding to the scanning lines and Y
The second display electrode is composed of two electrodes.

The first red electrode, the second red electrode, the first green electrode, and the first green electrode, which are provided for each of the three primary colors red, green, and blue that constitute each pixel perpendicularly to the scanning line direction, An address electrode composed of two green electrodes, a first blue electrode, and a second blue electrode, and an X1 electrode and a Y electrode provided at each position corresponding to the scanning line.
The first display electrode is composed of one electrode, and the second display electrode is composed of an X2 electrode and a Y2 electrode provided at each position corresponding to the scanning line.

[0013]

With the above-mentioned structure, 256 shown in FIG.
This will be described with reference to a driving sequence for gradation display. For example, when displaying the brightness of one field (screen) at the brightness level of "144", it is realized as follows.
The first display electrode provided for each scanning line is supplied with a required pulse to the address electrode, the X1 electrode, and the Yn1 electrode so that only the third subfield (SF3) in one field is lit. Controlled. In addition, the second display electrode is a fourth subfield (SF) in one field.
The address electrode, the X2 electrode, and the Yn2 electrode are controlled so that only 4) lights up. Therefore, in one field, only SF3 and SF4 are turned on,
The respective brightnesses "16" and "128" are added to realize the brightness "144". In the Yn1 electrode, n represents each Y1 electrode from scanning line number 1 to scanning line number 480.

[0014]

The plasma display panel according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a diagram showing an electrode structure of an embodiment of a plasma display panel according to the present invention. Reference numeral 1 is a pixel having a red, green, and blue stripe-shaped cell that constitutes a plasma display panel. Reference numeral 2 is a red address electrode which is a red address electrode. 4 and 5 are X1 display electrodes of the first display electrode and Y provided on the upper half side of the first scanning line, for example.
11 display electrodes. 6 and 7 are the first scanning lines, for example,
The X2 display electrode and the Y12 display electrode of the second display electrode provided on the lower half side. Although one pixel portion has been described, the same applies to other pixels. For example, in the pixel with the scanning line number n, the Y1 electrode and the Y2 electrode are represented by the Yn1 electrode and the Yn2 electrode, respectively.

The operation of the plasma display panel according to the present invention will be described with reference to FIGS. FIG. 2 is a diagram showing a driving sequence for displaying 256 gradations in the plasma display panel according to the present invention. The first display electrode and the second display electrode of FIG. 1 have subfields SF1, SF2,
It drives in order of SF3 and SF4. The sub-fields SF1 to SF4 displayed on the first display electrode have an even power of 2 and a brightness of 1 (= 2 to the power of 0), 4 (= 2 to the power of 2), 16
(= 2 to the 4th power) and 64 (= 2 to the 6th power) are displayed. On the other hand, the sub-fields SF1 to SF4 displayed by the second display electrode have a brightness of an odd power of 2 and 2 (= 1 of 2).
Power), 8 (= 2 power of 3), 32 (= 2 power of 5), 128
(= 2 to the 7th power) is displayed. The first display electrode and the second display electrode are controlled in parallel and independently. Therefore,
By controlling the lighting of the first display electrode and the second display electrode, it is possible to arbitrarily display the brightness of 1 to 256 in four subfields arranged in series.

For example, if the first display electrode and the second display electrode are all controlled to be turned on at the same time, the brightness of one field can be set to 256. Further, if all the first display electrodes are controlled to be lit, the brightness of one field is 85. If all the second display electrodes are controlled to be lit, the brightness of one field is 170. it can.

Therefore, as shown in FIG. 5, the conventional method of displaying 256 gradations in 8 subfields in series is executed in 4 subfields in series in the plasma display panel according to the present invention. it can. The total time of the address period is 1.5 ms × 4 = 6 ms. The display period is about 10.7 milliseconds in the remaining period of one field (about 16.7 milliseconds). Conventionally, the total time of the address period is 1.5 milliseconds × 8 = 12 milliseconds.
Since the display period is increased by 6 milliseconds, the effective pulse width of the sustain pulse can be increased accordingly. 2
The frequency of the sustain pulse of the second display electrode for controlling the lighting of the odd power of 2 is twice as high as the frequency of the sustain pulse of the display electrode 1.

FIG. 3 is a view showing an electrode structure of another embodiment of the plasma display panel according to the present invention. The same parts as those in the embodiment of FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. Reference numerals 12 and 13 are a first red electrode and a second red electrode which are red address electrodes. In this example, 2 for each color
By providing one address electrode, the address signal can be separately supplied to the first red electrode 12 and the second red electrode 13 at the time of addressing, so that the same pulse is supplied to the Y11 electrode 5 and the Y12 electrode 7, The red electrode and the second red electrode can be individually addressed. Therefore, the number of pulses supplied to the Y11 electrode 5 and the Y12 electrode 7 can be set to, for example, 480 for addressing scan lines 1 to 480, which is 1/1 of the case of one address electrode shown in FIG. Two
Can be

[0019]

As described above, the present invention provides a plasma display panel having multiple gradations and a bright screen. Therefore, for example, in the case of realizing a screen of 256 gradations, conventionally, it was executed in eight subfields and the display period was about 4.7 milliseconds. However, in the plasma display panel of the present invention, the display period is about 10.7 milliseconds,
There is a merit that you can get about twice the brightness.

[Brief description of drawings]

FIG. 1 is a diagram showing an electrode structure of an embodiment of a plasma display panel according to the present invention.

FIG. 2 is a diagram showing a driving sequence of 256 gradation display in the plasma display panel according to the present invention.

FIG. 3 is a view showing an electrode structure of another embodiment of the plasma display panel according to the present invention.

FIG. 4 shows a structure of a conventional PDP panel.

FIG. 5 is a diagram showing a driving sequence of 256 gradation display of a conventional address / display separation type subfield method.

FIG. 6 is a drive waveform diagram of the address / display separation type subfield method.

[Explanation of symbols]

 1 Pixel 2 Red Electrode 4 X1 Display Electrode 5 Y11 Display Electrode 6 X2 Display Electrode 7 Y12 Display Electrode 12 First Red Electrode 13 Second Red Electrode

Claims (5)

[Claims] 1. A red electrode provided for each of the three primary colors red, green, and blue constituting each pixel perpendicular to the scanning line direction, an address electrode composed of a green electrode and a blue electrode, and a scanning line. The first display electrode composed of the X1 electrode and the Y1 electrode provided at each position to be provided, and the X provided at each position corresponding to the scanning line.
A plasma display panel comprising a second display electrode composed of two electrodes and a Y2 electrode. 2. A first red electrode, a second red electrode, a first green electrode, and a first green electrode which are provided for each of the three primary colors red, green, and blue constituting each pixel perpendicularly to the scanning line direction. Two green electrodes,
An address electrode composed of the first blue electrode and the second blue electrode,
A first display electrode composed of an X1 electrode and a Y1 electrode provided at each position corresponding to the scanning line, and a second display electrode composed of an X2 electrode and a Y2 electrode provided at each position corresponding to the scanning line. Plasma display panel characterized by becoming. 3. The plasma display panel according to claim 1, wherein gradation display is performed in parallel with the first display electrode and the second display electrode. 4. The gradation display performed by the first display electrode is displayed with an even power of 2 for each subfield, and the gradation display performed by the second display electrode is displayed by an odd number of 2 for each subfield. 3. The plasma display panel according to claim 1, wherein the plasma display panel is displayed with a power of brightness. 5. The plasma display panel according to claim 1, wherein the frequency of the sustain pulse supplied to the first display electrode is different from the frequency of the sustain pulse supplied to the second display electrode.