KR19990074400A - Cell structure of plasma display panel - Google Patents

Abstract

The present invention relates to a cell structure of a plasma display panel (PDP) in which at least one barrier rib is provided between a sustain electrode and a common electrode in a cell to increase a coating area of a phosphor and a discharge distance between electrodes, thereby improving luminance characteristics. will be.

One embodiment of the present invention, the front substrate (1) that is the display surface of the image, the back substrate (2) positioned in parallel with a predetermined distance between the front substrate 1 and the front substrate (1) And a partition wall 3 formed between the rear substrate 2 and a rear surface 2 of the front substrate 1 to form a discharge space in which a rare gas according to luminescence characteristics is to be enclosed, and the rear substrate 2 of the front substrate 1. Discharge current at the time of discharging formed under the opposing surface of the first and second sustain electrodes 4 and 5 alternately arranged so as to be orthogonal to the partition walls 3 and the rear substrate 2 of the front substrate 1. The first and second sustains are formed in parallel with the barrier ribs 3 on the opposite surface of the dielectric layer 6 and the barrier ribs 3 between the barrier ribs 3 and the front substrate 1 between the barrier ribs 3. And formed under the dielectric layer 6 between the address electrode 7 causing the discharge together with the electrodes 4,5 and the first and second sustain electrodes 4,5. The inner partition 111 extending the discharge distance between the first and second sustain electrodes 4 and 5, and formed on the inner surface of the discharge space, the red, green, blue (R, G, B) of The fluorescent layer 112 emits visible light, respectively.

Description

Cell structure of plasma display panel

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cell structure of a plasma display panel (hereinafter referred to as "PDP"). In particular, at least one barrier rib is provided between a sustain electrode and a common electrode in a cell, and the coating area of the phosphor and the discharge distance between the electrodes. The present invention relates to a cell structure of a PDP in which the luminance characteristic is increased to improve the luminance characteristic.

As shown in FIG. 1, the cell structure of the conventional PDP includes a front substrate 1 that is a display surface of an image, a rear substrate 2 that is disposed in parallel with a predetermined distance from the front substrate 1, and A partition wall 3 formed between the front substrate 1 and the rear substrate 2 to form a discharge space in which the rare gas according to the light emission characteristics is to be enclosed, and a rear substrate 2 of the front substrate 1; A sustain electrode 4 and a common electrode 5 (hereinafter referred to as " first and second sustain electrodes ") formed alternately arranged on the opposite surface to the partition 3, and the front substrate ( 1) a dielectric layer 6 formed under an opposing surface of the rear substrate 2 to limit discharge current during discharge, and facing the front substrate 1 of the rear substrates 2 between the partition walls 3; An address electrode 7 formed on a surface of the discharge space in parallel with the barrier rib 3 and causing discharge together with the first and second sustain electrodes 4 and 5; Is formed on the surface has been configured to discharge when red, green, and blue (R, G, B) fluorescent layer 8 to emit visible light of each of the individual cells.

The PDP configured as described above excites a phosphor to ultraviolet rays generated during discharge between electrodes to generate visible light. This driving principle will be described with reference to FIGS. 1 to 3.

First, the barrier ribs 3, which allow the front substrate 1 and the rear substrate 2 to maintain a predetermined interval, are made of an insulator to prevent crosstalk between pixels. The method of manufacturing the barrier ribs 3 is known in the art. It is produced by printing technique, sand blasting technique, dry film register technique, etc.

Thereafter, when the peripheral portion of the partition 3 is sealed with a sealing liquid, a flat space, that is, a discharge space is formed between the front substrate 1 and the rear substrate 2.

In addition, a desired gas is sealed in the discharge space according to the light emission characteristics. In general, a helium-xenon gas is used for the direct current plasma, and a neon-xenon gas is used for the alternating current plasma.

In the case of the direct cell type, the fluorescent layer 8 is formed by applying a phosphor to the entire surface of the direct cell type, and the fluorescent layer 8 is formed by applying the fluorescent material to the left, right and lower surfaces of the reflective type. .

On the other hand, the driving of the cell manufactured as described above is injected into the discharge space when voltage is applied to the first and second sustain electrodes 4 and 5 provided on the front substrate 1 and the address electrode 7 provided on the back substrate 2. After the excited rare gas is excited, it transitions back to the ground state and vacuum ultraviolet rays are generated.

Then, the fluorescent layer 8 formed inside the cell is excited by the vacuum ultraviolet rays to generate visible light, and the visible light is used to display a desired image on the screen. Is implemented.

That is, one pixel is composed of three discharge cells of R, G, and B. For example, in the case of 256 gray levels, if the number of discharges of each discharge cell is divided by 0 to 255 times every frame, the brightness varies depending on the number of discharges. Is implemented.

At this time, the types of discharges selectively generated inside each cell include an address discharge for the first discharge, a sustain discharge for holding the discharge of the discharge cell, and an erase discharge for stopping the holding of the discharge cell.

Here, the first and second wall charges in the discharge space are not discharged due to the address discharge between the address electrode 7 of the rear substrate 2 and the first and second sustain electrodes 4 and 5 of the front substrate 1. It is formed in the dielectric layer 6 near the two sustain electrodes 4 and 5 and maintained by the sustain discharge between the first and second sustain electrodes 4 and 5 of the front substrate 1.

For example, when the driving waveform shown in FIG. 2 is applied to each of the electrodes 4, 5, and 7, the progress of the wall charge at the points (a) to (a) is shown in (a) to (ah). Indicates the status.

In detail, before the (a) state, there is no wall charge in the discharge cell. If address discharge occurs between the address electrode 7 and the first sustain electrode 4 at the point (A), wall charges are formed inside the cell after the address discharge at the point (B).

At this time, most of the wall charges are formed in the first and second sustain electrodes 4 and 5. The write pulse applied to the address electrode 7 has a width of 2 s or more, which is time for forming wall charges.

Then, sustain discharge occurs between the first and second sustain electrodes 4 and 5 at the point (C), and wall charges appearing at the point (B) are reversed after the sustain discharge at the point (D).

At this time, the sustain voltage difference of each of the electrodes 4, 5, and 7 may use a voltage lower than the difference of the writing voltage between the address electrode 7 and the first sustain electrode 4. This is due to the wall charges formed in the dielectric layer 6. This is a memory effect, and sustain discharge does not occur in cells in which wall charges are not formed.

Subsequently, point (e) and point (b) indicate sustain discharge by the sustain pulse, and the wall charge is opposite to the point (d).

Thus, one sustain period is from point (C) to point (B), and the number of discharges is twice during one sustain period.

In addition, the erase discharge occurs at the point (4), the erase discharge has a pulse width of 1 m or less, and the pulse height is lower than the sustain voltage. This pulse causes the discharge between the first and second sustain electrodes 4 and 5, but there is no time to form wall charges. Thus, the cell is free of wall charges at the point (A). The discharge does not occur even when a pulse is applied.

However, such PDPs have significantly lower luminance characteristics than CRTs. For this reason, the use of the negative glow region as a discharge region results in a strong UV generation intensity, but a small generation width. It emits vacuum ultraviolet rays.

Therefore, a method of increasing the driving voltage to increase the emission of vacuum ultraviolet rays may be considered as a method for improving the luminance characteristics. In this case, however, the cost increases in implementing the peripheral circuit and causes a sudden decrease in the lifetime of the PDP. There was a problem.

Therefore, the development of the cell structure of the PDP to increase the discharge distance during the discharge of each cell or to increase the coating area of the phosphor that emits visible light in the discharge space to improve the luminance characteristics has been an urgent research problem.

Therefore, the present invention has been proposed to solve the above-mentioned problems and research problems, and at least one partition wall is provided between two sustain electrodes in the cell to increase the coating area of the phosphor and the discharge distance between the electrodes, thereby improving luminance characteristics. It is an object of the present invention to provide a cell structure of a PDP that is improved.

The technical means of the present invention for achieving this object is a pair of two substrates that are coupled in parallel to each other, a partition wall arranged between the substrates to form a discharge space, and a pair so as to intersect the partition wall on one of the substrates A plurality of sustain electrodes arranged in a row, a dielectric layer formed on one substrate to limit discharge current during discharge, an address electrode formed in parallel with a partition on the other substrate of the substrate to generate a discharge together with the plurality of sustain electrodes; At least one of the plurality of sustain electrode pairs in the discharge space is formed to extend the discharge distance between the sustain electrodes and a fluorescent layer formed on the inner surface of the discharge space to emit visible light when the cell is discharged. do.

1 is a cell structure diagram of a conventional plasma display panel.

FIG. 2 is an exemplary view of a drive waveform applied to each electrode shown in FIG. 1. FIG.

3 is a wall charge progress diagram of a corresponding cell according to the driving waveform shown in FIG. 2.

4 is a cell structure diagram of a plasma display panel according to a first embodiment of the present invention;

5 is a cell structure diagram of a plasma display panel according to a second embodiment of the present invention;

*** Explanation of symbols for the main parts of the drawing ***

1: Front board 2: Back board

3: bulkhead 4: sustain electrode (first sustain electrode)

5 common electrode (second sustain electrode) 6 dielectric layer

7: address electrode 8,112,122: fluorescent layer

111,121a, 121b, 121c: Internal bulkhead

Hereinafter, the present invention will be described with reference to the accompanying drawings.

4 shows a cell structure diagram of a PDP according to a first embodiment of the present invention, in which a front substrate 1, which is a display surface of an image, and a rear substrate positioned in parallel with a predetermined distance from the front substrate 1 are shown. (2), a partition wall (3) which is arranged between the front substrate (1) and the rear substrate (2) to form a discharge space in which a rare gas according to the light emission characteristics is to be enclosed, and the front substrate (1). And first and second sustain electrodes 4 and 5 alternately arranged on the opposite surface of the rear substrate 2 so as to be orthogonal to the partition wall 3, and the rear substrate 2 of the front substrate 1. A dielectric layer 6 formed under an opposing surface of the diaphragm to limit a discharge current during discharge, and on the opposing surface of the rear substrate 2 between the barrier ribs 3 and the front substrate 1; An address electrode 7 formed in parallel to cause discharge together with the first and second sustain electrodes 4 and 5 and the first and second sustain electrodes 4 and 5. An internal partition 111 formed below the dielectric layer 6 to extend the discharge distance between the first and second sustain electrodes 4 and 5, and formed on an inner surface of the discharge space to generate a discharge time of each cell; The fluorescent layer 112 emits visible light of green and blue (R, G, B), respectively.

Referring to Figure 4 attached to the operation and effect of the PDP cell according to the first embodiment of the present invention configured as described above are as follows.

First, as in the prior art, the barrier rib 3 for maintaining the predetermined distance between the front substrate 1 and the rear substrate 2 uses an insulator to prevent crosstalk between pixels. The method is manufactured by the known printing technique, sand blasting technique, dry film register technique, or the like.

The first and second sustain electrodes 4 and 5 are disposed between the first and second sustain electrodes 4 and 5 under the dielectric layer 6 formed under the opposite surface of the front substrate 1 to the rear substrate 2. The inner partition 111 is formed to extend the discharge distance between the shells, but the same method as the method of manufacturing the partition 3 is used, and the predetermined distance is separated from the rear substrate 2.

Thereafter, the peripheral portion of the partition wall 3 is sealed with a sealing liquid to form a flat space, that is, a discharge space between the front substrate 1 and the rear substrate 2.

In addition, a rare gas is enclosed in the discharge space according to the light emission characteristics. The direct current plasma uses helium-xenon gas, and the alternating plasma uses neon-xenon gas.

In the case of a direct cell type, the fluorescent layer 112 is formed by applying a phosphor on the entire surface of the direct cell type. In the reflective type, the opposite surface of the rear substrate 2 and the address electrode of the front substrate 1 are formed. (7) The fluorescent layer 112 is formed by applying a phosphor on the upper side and the inner surface of the partition 3 and the surface of the inner partition 111.

On the other hand, the driving of the cell fabricated as described above is similar to the above-described conventional technique, in which the voltage is applied to the first and second sustain electrodes 4 and 5 provided on the front substrate 1 and the address electrodes 7 provided on the back substrate 2. When is applied, vacuum ultraviolet rays are generated while the rare gas injected into the discharge space is excited and then transitions back to the ground state, and the fluorescent layer 8 formed inside the cell is excited by the vacuum ultraviolet rays to generate visible light.

Then, a desired image is displayed on the screen by using the visible light. Since the discharge principle and the gray scale implementation method are the same as those of the related art described with reference to FIGS. 2 and 3, a detailed description thereof will be omitted.

However, compared to the conventional cell structure shown in FIG. 1, the cell structure of the PDP according to the first embodiment of the present invention shown in FIG. 4 has the first and second sustain electrodes 4 due to the internal partition 111. It can be seen that the discharge distance between and 5) and the area of the fluorescent layer 112 to which the phosphor is applied are increased.

Therefore, due to the increase in the discharge distance, the discharge region is used not only in the negative glow region but also in the positive light region, thereby increasing the amount of vacuum ultraviolet rays generated in the discharge space.

Therefore, the intensity of light generated in the unit cell is increased due to an overlap effect in which the amount of vacuum ultraviolet rays generated is increased and the coating area of the fluorescent layer 112 is increased, thereby improving luminance characteristics.

FIG. 5 shows a cell structure diagram of a PDP according to a second embodiment of the present invention. The manufacturing method and driving method are the same as those of the first embodiment shown in FIG. 4, but the first and second sustain electrodes 4 and 5 are the same. A plurality of internal partitions 121a, 121b and 121c are alternately formed on the bottom surface of the dielectric layer 6 and on the opposite side of the front substrate 1 from the rear substrate 2, and the front or rear substrate inside the discharge space. The fluorescent layer 122 is formed on (2), the partition 3, the address electrode 7, and on the surfaces of the inner partitions 121a, 121b, 121c.

Therefore, the discharge distance and the phosphor between the first and second sustain electrodes 4 and 5, as well as the cell structure according to the first embodiment of the present invention shown in FIG. 4 as well as the conventional cell structure shown in FIG. It can be seen that the area of the fluorescent layer 122 is coated is increased.

Therefore, the same superposition effect as that of the first embodiment, that is, as the amount of vacuum ultraviolet rays generated is increased and the coating area of the fluorescent layer 122 is increased, the intensity of light generated in the unit cell is increased, thereby improving luminance characteristics. .

As described above, the technical gist of the present invention is to increase the discharge distance and the coating area of the fluorescent layer by providing at least one internal partition in the cell, and is limited to the first and second embodiments shown in the drawings. Rather, all other embodiments derived from forming at least one or more, that is, one to a plurality of internal partitions between the plurality of sustain electrodes in the discharge space and applying a phosphor to the inner partition surface are included in the technical scope.

As described above, the present invention has the effect of improving the luminance characteristics by providing at least one barrier rib between two sustain electrodes in the cell to increase the coating area of the phosphor and the discharge distance between the electrodes.

Claims (6)

Two substrates coupled in parallel to each other, Barrier ribs arranged between the substrates to form discharge spaces; A plurality of sustain electrodes arranged in pairs to intersect the barrier ribs on one of the substrates; A dielectric layer formed on the one side substrate to limit discharge current during discharge; An address electrode formed on the other side of the substrate in parallel with the partition wall to cause discharge together with the plurality of sustain electrodes; At least one internal partition formed between the plurality of sustain electrode pairs in the discharge space to extend the discharge distance between the sustain electrodes; And a fluorescent layer formed on an inner surface of the discharge space to emit visible light when the cell is discharged. The method of claim 1, And the inner partition wall is formed on the dielectric layer between the plurality of sustain electrodes in a single cell structure. The method of claim 1, And a plurality of inner partition walls are alternately formed between the plurality of sustain electrodes on the bottom surface of the dielectric layer and on the opposite surface of the rear substrate to the front substrate. The method according to any one of claims 1 to 3, And the fluorescent layer is formed on the other substrate, the partition wall and the address electrode in the discharge space. The method according to any one of claims 1 to 3, And the fluorescent layer is formed on the other substrate, the partition wall and the address electrode in the discharge space, and on the surface of the inner partition wall. The method according to any one of claims 1 to 3, And the fluorescent layer is formed on the entire surface of the discharge space.