KR19980085029A - Multi data electrode plasma display panel - Google Patents

Abstract

The present invention relates to a multiple data electrode plasma display panel having a plurality of data electrodes per discharge cell constituting a pixel, and a driving method thereof. The multi data electrode plasma display panel according to the present invention and a driving method thereof may be configured to construct a panel by using two or more data electrodes corresponding to each discharge cell and to generate charged particles for displaying an image. By performing data addressing with two or more data electrodes as compared with the conventional SD-PDP (surface discharge plasma display), the display real time is increased by two times or more, and the luminance is two times or more.

Description

Multi data electrode plasma display panel

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel and a driving method thereof, and more particularly, to a multi data electrode plasma display panel having a plurality of data electrodes per discharge cell constituting a pixel and a driving method thereof.

1 and 2 show an arrangement of an alternating-current plasma display panel (AC PDP). FIG. 1 is an exploded perspective view of an AC PDP, and FIG. 2 is a unit discharge cell in which electrodes of an AC PDP and an M x N pixel point, that is, an point where an X electrode, a Y electrode, and a data electrode meet each other are separated by a partition wall. Show the cell.

In Fig. 1, reference numeral 1 denotes a front glass substrate, 2 a rear glass substrate, 3 a data (address) electrode, 4 a partition, 5 a fluorescent material (phosphor) deposited between the partitions, 6 a dielectric layer, 7 and 8 are the X and Y electrodes respectively serving as sustain electrodes. The discharge (maintenance discharge) is mainly made between the X electrodes 7 (first sustain discharge electrodes) and the Y electrodes 8 (second sustain discharge electrodes). In order to select pixels (cells) according to the display data, the address electrodes 3 corresponding to the cells to be selected are selected to discharge (address discharge) with respect to one of the Y electrodes corresponding to the cells. The dielectric layer 6 serves as an insulating layer and is formed on the sustain discharge electrodes 7 and 8. An MgO protective film is formed over the dielectric layer 6. Opposite these layers, the windshield substrate 1 has address electrodes 3 and phosphors 5.

The partition 4 is formed on one or two glass substrates 1, 2 to define a discharge space. Each discharge space defines a cell (pixel) that causes a discharge. When a discharge occurs, ultraviolet light is generated so that the phosphor 5 emits light. 2 shows an MxN matrix forming a display screen. Reference numerals A1 to AM denote address electrodes 3, and Y1 to YN denote Y electrodes 8. The X electrodes 7 are connected to each other.

3 is a timing chart illustrating a PDP driving method described in U.S. Patent No. 5,436,634. In the drawing, one frame is divided into a first field F1 and a second field F2. Other subfields that produce intensity levels (gradation levels) are assigned to odd and even display lines, respectively. That is, this embodiment sequentially forms wall charges in accordance with the display data during the address period in the interlace mode and performs sustain discharge in accordance with the display data during the sustain discharge period.

For odd display lines as shown in FIG. 3, the first field F1 includes the address period A8 of the subfields SF1 to SF7 and the subfield SF8 of the second field F2. These S81 to S87 periods for the odd display lines are the same as the sustain discharge periods S1 to S7 in the subfields SF1 to SF7 for the even display lines. Nothing is performed on the even display lines while the odd display lines are addressed in the address periods A1 to A8 of the subfields SF1 to SF8.

Similarly, for even display lines, the second field F2 includes the subfields SF1 to SF7 and the address period A8 of the subfield SF8 of the first field F1 'of the next frame, wherein the first field F1' is merely a subfield SF8. Sustain discharge periods S81 to S87. These S81 to S87 periods for even display lines are the same as sustain discharge periods S1 to S7 in subfields SF1 to SF7 for odd display lines. The subfield SF8 includes not only the rest periods N1 to N7 but also the sustain discharge periods S81 to S87.

The sustain discharge periods S1 through S7 and S81 through S87 of the subfields SF1 through SF8 include different numbers of sustain discharge cycles, each sustain discharge cycle generating one discharge pulse between the X and Y electrodes. The number of sustain discharge cycles in the subfields SF1 to SF8 is 4, 8, 16, 32, 64, 128, 256 and 508, respectively. That is, the ratio is 1: 2: 4: 8: 16: 32: 64: 127. The 508 sustain discharge cycles in the subfield SF8 are divided into 4, 8, 16, 32, 64, 128, and 256 of the sustain discharge periods S81 through S87, respectively. That is, sustain discharge periods S81 through S87 of the subfield SF8 for odd (even) display lines are the same length as sustain discharge periods S1 through S7 of the subfields SF1 through SF7 for even (odd) display lines, Phase and number of cycles. In the subfield SF8, the overwrite operation is not performed during the idle periods N1 to N8, and thus the sustain discharge operation in the periods S81 to S87 is executed according to the display data selectively written in the address period A8.

This method provides 255 different luminance, 255 intensity levels. Since the sustain discharge is performed in the same phase in odd and even display lines, it is not necessary to have separate driving circuits. This method can thus be achieved on existing drive circuits.

4 illustrates an example of a PDP driving waveform according to the PDP driving method of FIG. 3. When the address period in each subfield starts, the total write / erase operation is executed by creating a uniform condition (atmosphere) in all cells. This total write / erase operation is performed on odd display lines in the first field and even display lines in the second field. Therefore, the selective write operation is executed sequentially on the odd display lines in the first field and on the even display lines in the second field to form wall charges in the selected cells. After the address period, the sustain discharge period follows.

In FIG. 4, the Y _N electrode driving waveform is sequentially applied to odd display lines in the first field and even display lines in the second field. Unwritten display lines receive the Y _{N + 1} electrode drive waveform.

During the sustain discharge period, the cells re-written in the address period are sustain discharged according to the newly written data. Cells not used again are sustained and discharged according to the display state in the previous subfield to maintain the previous state. For example, for even display lines, sustain discharge in the second field is executed in accordance with the display data written in the last address period in the first field, that is, in the address period of the subfield SF8 having the highest luminance.

The amount of display data used to rewrite the odd display lines in the address periods A1 to A8 in the first field is half the amount required by the previous method. That is, the storage capacity can be achieved with a frame memory that is half of the previous memory.

FIG. 3 shows the addressing, maintenance, and suspension periods of each of the driving waveforms of FIG. 4 with time on the horizontal axis. According to the PDP driving method of this embodiment, eight subfields are prepared to display 255 intensity levels (gradations). Here, the number N _{(GRAY SCALE)} of the intensity levels is expressed as follows.

N _{(GRAY SCALE)} = 2 ^N -1 ........................ (1)

Where N is the number of subfields.

According to the standard intensity level display method of dividing one frame into subfields, the number of intensity levels N _{(GRAY SCALE} ) is expressed as follows.

N _{(GRAY SCALE)} = 2 ^N ......... (2)

Where N is the number of subfields.

If there are 8 fields, 256 intensity levels are provided. However, this embodiment lacks one intensity level because the number of sustain discharge pulses in the first field is equal to the number of sustain discharge pulses in the second field.

In order to provide 256 intensity levels as indicated by equation (2), the number of sustain discharge operations in the first field must be different from the number of sustain discharge operations in the second field. To achieve this, the subfields SF1 and SF2 have the same number of sustain discharge pulses, and an erase pulse is inserted within the sustain discharge period in the subfield SF1 to pause the sustain discharge. This example is described in detail in US Pat. No. 5,346,634. This is briefly described as follows.

For example, to display 256 gradations, add the holding pulse numbers of the subfields S1 to S7 to make them equal to the holding pulse numbers of S8. Make the pulse number of S1 equal to S2 and use the Y electrode to display the subfield SF1. When the pulse (Erase Pulse) is displayed and the subfield SF8 is displayed, the erase pulse is not given so that the pulse number of S8 is twice the pulse number of S7.

As described above, the surface discharge plasma display panel applies a voltage equal to or greater than the discharge start voltage between the data electrode and the scan electrode (Y electrode) to form priming particles necessary for discharge and to form an X electrode. The discharge sustain voltage is applied between the and Y electrodes to discharge the image, thereby displaying an image. As shown in FIG. 2, the points where the X electrode (Sustain electrode), the Y electrode (scanning electrode) and the data electrode meet are separated by a partition wall to form one discharge cell. In Fig. 4, the addressing period is a time for supplying charged particles to sustain discharge. One frame screen, which is provided 60 times per second, consists of eight subscreens. The image data in the analog format is converted into 8-bit digital data, and the first bit to the eighth bit are collected separately to form eight sub-screens. Each sub picture displays 256 gray levels by using the number of sustain pulses 1: 2: 4: 8: 16: 32: 64: 128 in duplicate. Light emission is caused to all cells in the scanning line to be addressed through pulses applied to the X and Y electrodes in front of the addressing period. An erase pulse is applied to the Y electrode to erase the wall charge formed by the discharge a short time ago and to make a space charge. The role of space charge is to lower the discharge voltage and reduce the probability of mis-discharge during address discharge.

However, the problem is that the NTSC video signal requires a very fast driving signal to address 500 lines, 8 subfields, and 30 screens of data per second.

The present invention has been made to solve the above problems, and an object thereof is to provide a multiple data electrode plasma display panel multiplexed with data electrodes corresponding to respective discharge cells and a driving method thereof.

1 is an exploded perspective view of a conventional surface discharge plasma display panel;

2 is a layout view of electrodes of the surface discharge plasma display panel of FIG.

3 is a timing chart illustrating a conventional PDP driving method;

4 is a waveform diagram of an electrode driving signal of a surface discharge plasma display panel according to the driving method shown in FIG. 3;

5 is an exploded perspective view of a surface discharge plasma display panel according to the present invention;

6 is a layout view of electrodes of the surface discharge plasma display panel of FIG. 5;

7 is a waveform diagram of an electrode driving signal according to an electrode arrangement of a surface discharge plasma display as shown in FIG. 6.

Explanation of symbols for main parts of the drawings

1. Front glass substrate 2. Back glass substrate

3. Data (address) electrode 4. Bulkhead

5. Fluorescent material (phosphor) 6. Dielectric layer

7. X electrodes (first sustain discharge electrodes) 8. Y electrodes (second sustain discharge electrodes)

11. Front glass substrate 12. Back glass substrate

13a. First data (address) electrode 13b. Second data (address) electrode

14. Bulkhead 15. Fluorescent material (phosphor)

16. Dielectric layer 17. X electrodes (first sustain discharge electrodes)

18. Y electrodes (second sustain discharge electrodes)

In order to achieve the above object, the multi-data electrode plasma display panel according to the present invention includes: a front substrate and a rear substrate facing each other at regular intervals; A discharge sustain electrode and a scan electrode formed side by side on the stripe to correspond to the discharge cells on the opposite surface of the one substrate; A dielectric layer stacked on the opposite surface of the one substrate and on the discharge sustain electrode and the scan electrode; A data electrode formed on the opposite surface of the other substrate so as to have a stripe shape in a direction crossing the discharge sustain electrode and the scan electrode so as to correspond to the discharge cell; A dielectric layer stacked on opposite sides of the data electrode and the other substrate; Barrier ribs stacked on a stripe to form the discharge cells on a dielectric layer of the other substrate; And a phosphor coated on a side surface of the partition wall forming a discharge space of the discharge cell and on a dielectric layer of the other substrate, wherein at least two data electrodes respectively corresponding to the discharge cells are provided. It is characterized by being formed of more than one.

In the present invention, it is preferable that two or three data electrodes respectively corresponding to the discharge cells.

In addition, in order to achieve the above object, the driving method of the multiple data electrode plasma display panel according to the present invention is a driving method of the multiple data electrode plasma display panel in which data electrodes corresponding to each discharge cell are formed in multiple numbers, respectively. In the combination of one pair of data electrodes and one pair of scan electrodes, pulse voltages having opposite potentials are applied to each pair of data and scan electrodes so as to selectively discharge only the pair of data and scan electrodes. And applying it using a Paschen rule so that no mis-discharge occurs between the pairs.

Hereinafter, a multi-data electrode plasma display panel and a driving method thereof according to the present invention will be described with reference to the drawings.

5 and 6 illustrate an internal structure of an alternating-current plasma display panel (AC PDP). FIG. 6 is an exploded perspective view of the surface discharge AC PDP, and FIG. 6 is isolated by partition walls between electrodes of the surface discharge AC PDP and M x N pixel points, that is, points at which the X electrode, the Y electrode, and the data electrode cross each other. Each unit discharge cell is shown.

In Fig. 5, reference numeral 11 denotes a front glass substrate, 12 a rear glass substrate, 13 a data (address) electrode, 14 a partition, 15 a fluorescent material (phosphor) deposited between the partitions, 16 a dielectric layer, 17 and 18 are X and Y electrodes respectively serving as discharge sustain electrodes. The discharge (maintenance discharge) is mainly made between the X electrodes 17 (first sustain discharge electrodes) and the Y electrodes 18 (second sustain discharge electrodes). In order to select pixels (cells) according to the display data, the data (address) electrodes 13 corresponding to the cells to be selected are selected to discharge (address discharge) with respect to one of the Y electrodes corresponding to the cells. . The dielectric layer 16 serves as an insulating layer and is formed on the sustain discharge electrodes 17 and 18. An MgO protective film is formed over the dielectric layer 16. The data electrodes 13 and the fluorescent material 15 are formed on the opposite surface opposite these layers.

The partition 14 is formed on one or two glass substrates 11 and 12 to define a discharge space. Each discharge space defines a cell (pixel) that causes a discharge. When a discharge occurs, ultraviolet light is generated so that the fluorescent material 15 emits light. 6 shows an MxN matrix forming a display screen. Reference numerals A ₁ to A _m represent the first data electrodes 13a, AA ₁ to AA _m represent the second data electrodes 13b, and Y ₁ to Y _n represent the Y electrodes 18. The X electrodes 17 are connected to each other.

As described above, the surface discharge plasma display panel according to the present invention is characterized in that the data electrodes are formed in multiple (double).

Next, a driving method of the multiple data electrode plasma display according to the present invention will be described with reference to FIG. 7.

7 is a waveform diagram of an electrode driving signal according to an electrode arrangement. As shown, the driving method of the multiple data electrode SD-PDP according to the present invention is to drive the data electrode formed of multiple (dual) at high speed by applying an electrode driving waveform as shown in FIG.

When one field is composed of eight surf fields to display 256 gray scale images, the subfields SF1 to SF8 are driven as in the conventional driving method. That is, as shown in Fig. 3, each subfield SF1-SF8 is composed of an addressing period A1-A8 and a maintenance period S1-S7 and S81-S87. The line addressing at one time is the maximum number of lines that the charged particles do not naturally extinguish during the addressing period. The number of maintenance pulses is determined by the ratio S1: S2: S3: S4: S5: S6: S7: S8 (S81-S87) = 1: 2: 4: 8: 16: 32: 64: 128 . The first data electrode A ₁ -A _m and the second data electrode AA ₁ -AA _m electrodes apply voltages opposite to each other as shown in FIG. 7, but the first data electrode A _{1 -m} and the second data electrode The voltage applied is determined so that the discharge does not occur between (AA _1-m ). The Y electrode corresponding to the first data electrode A does not discharge with the second data electrode AA, and the Y electrode corresponding to the second data electrode AA determines the applied voltage so that no discharge occurs with the first data electrode A. do. Prevention of false discharges uses Paschen's law. Since data writing (addressing) is performed using the first data electrode A and the second data electrode AA, data can be written twice as fast. Therefore, since the conventional writing of 64 data lines can be performed by writing 128 data lines at a time, the duty cycle is doubled.

As described above, the multi-data electrode plasma display panel and the driving method thereof according to the present invention comprise charged particles for constructing a panel and displaying an image by using two or more data electrodes corresponding to each discharge cell. When generating particles, data addressing is performed with two or more data electrodes compared to conventional SD-PDPs (surface discharge plasma displays) such as Fujitsu, NEC, Plasmaco, and Thomson. It is more than twice as high. In addition, since the display real-time (duty cycle) is more than doubled, the luminance can be more than doubled by the discharge sustaining pulses of the same speed (short cycle), and the discharge sustaining pulse of slow speed (long cycle) can be obtained for stable driving. Even when used, there is an advantage that can achieve the same brightness as in the prior art.

Claims (3)

A front substrate and a rear substrate facing each other at regular intervals; A discharge sustain electrode and a scan electrode formed side by side on the stripe to correspond to the discharge cells on the opposite surface of the one substrate; A dielectric layer stacked on the opposite surface of the one substrate and on the discharge sustain electrode and the scan electrode; A data electrode formed on the opposite surface of the other substrate so as to have a stripe shape in a direction crossing the discharge sustain electrode and the scan electrode so as to correspond to the discharge cell; A dielectric layer stacked on opposite sides of the data electrode and the other substrate; Barrier ribs stacked on a stripe to form the discharge cells on a dielectric layer of the other substrate; A multi-tatter electrode plasma display panel comprising: a phosphor coated on a side surface of the barrier rib and a dielectric layer of the other substrate, which forms a discharge space of the discharge cell; And at least two or more data electrodes corresponding to each of the discharge cells. The method of claim 1, And two or three data electrodes respectively corresponding to the discharge cells. A driving method of a multiple data electrode plasma display panel in which multiple data electrodes corresponding to each discharge cell are formed, In a combination of electrodes each consisting of a pair of data electrodes and a scan electrode, pulse voltages having opposite potentials are applied to the pair of data electrodes and the scan electrodes so that discharge occurs selectively only at each pair of data and scan electrodes. However, applying using a Passen rule so that no mis-discharge occurs between each pair; And a driving method of the multiple data electrode plasma display panel.