Plasma display panel

Abstract

A plasma display panel is disclosed, which prevents luminance from being reduced, prevents error discharge from occurring due to crosstalk, and improves exhaust ability. Auxiliary barriers or projections are formed in a boundary portion between respective cells in a stripe type barrier structure. Alternatively, a predetermined groove is formed in a predetermined position of a dielectric layer in a lattice shaped barrier structure. In addition to these barriers, second barriers are formed at a greater width or at constant intervals. Thus, exhaust ability can be improved, and error discharge due to crosstalk can be prevented from occurring. Also, luminance in corner portions of the cell can be improved, and contrast can be improved even if a black matrix is not formed.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel which improves emitting luminance, emitting efficiency, and exhaust ability.

2. Discussion of the Related Art

Generally, a plasma display panel which is a gas discharge display device is divided into a DC type, an AC type, and a hybrid type depending on its electrode structure. The DC type and the AC type are determined depending on exposure of the electrode to a discharge plasma. Namely, in the DC type, the electrode is directly exposed to the discharge plasma. In the AC type, the electrode is indirectly combined with the plasma through a dielectric. This difference is generated by a difference of discharge phenomenon between the DC type and the AC type. In case of the AC type, charge particles formed by discharge are staked on a dielectric layer. That is, electrons are stacked on the dielectric layer on an electrode to which positive(+) potential is applied while ions are stacked on the dielectric layer on an electrode to which negative(−) potential is applied.

A related art AC type plasma display panel of three-electrode area discharge type will be described with reference to FIG. 1.

As shown in FIG. 1, the related art plasma display panel of three-electrode area discharge type includes a first substrate 1 and a second substrate 1a. X electrode 4, Y electrode 2, and Z electrode 3 are formed in a matrix arrangement. Namely, the Y electrode 2 and the Z electrode 3 are formed on the first substrate 1 in a row direction, and the X electrode 4 is formed on the second substrate 1a to cross the Y electrode 2 and the Z electrode 3.

A cell 5 is formed in a point where the respective electrodes cross one another. The Y electrode 2 is a scan electrode and is used for scanning of a screen. The Z electrode 3 is a sustain electrode and is used to sustain discharge. The X electrode 4 is an address electrode and is used for data input.

The X electrode 4 formed in each cell is connected to an X electrode driving circuit and receives an address pulse. The Y electrode 2 is connected to a Y electrode driving circuit and receives a scan pulse. The Z electrode 3 is connected to a Z electrode driving circuit and receives a sustain pulse.

A stripe type barrier and a well type barrier of the related art plasma display panel will be described with reference to the accompanying drawings.

FIG. 2a is a layout showing a stripe type barrier structure of the related art plasma display panel.

First, in the stripe type barrier structure, as shown in FIG. 2a, a plurality of first substrate electrode pairs consisting of Y electrode 11 and Z electrode 12 are formed in a row direction at constant intervals. Stripe type barriers 13 are formed across the first substrate electrode pairs at constant intervals. An X electrode(not shown) is formed in a central portion between the respective barriers. A reference numeral 21 which is not described denotes a discharge region and a reference numeral 22 denotes a main discharge region.

FIG. 2b is a sectional view taken along line I-I′ of FIG. 2a, in which the first substrate is rotated by 90°. Referring to FIG. 2b, the first substrate electrode pairs consisting of Y electrode 11 and Z electrode 12 are formed on a first substrate 10. A first dielectric layer 15 is formed on the first substrate 10 including the first substrate electrode pairs. An X electrode 14 is formed on a second substrate 10a to cross the first substrate electrode pairs. The first substrate 10 and the second substrate 10a oppose each other. A second dielectric layer 16 is formed on the second substrate 10a including the X electrode 14. To avoid leakage between adjacent X electrodes, barriers 13 are formed at both sides of the X electrodes at a constant distance from the X electrodes. A phosphor layer 17 is formed on the barriers 13 and the second dielectric layer 16.

As described above, in the stripe type barrier structure, lower sides of the barriers 13 are located at a distance away from the main discharge region 22. Thus, the distance between the main discharge region 22 and the phosphor layer 18 below the barriers 13 is farther than the distance between the main discharge region 22 and the phosphor layer 18 above the X electrode 11. For this reason, loss occurs while ultraviolet rays generated by discharge reach a portion below the barriers.

FIG. 3 is a layout showing a well type barrier structure of the related art plasma display panel.

In the well type barrier structure, arrangement of electrodes are similar to that of FIG. 2a. In FIG. 2a, the barriers are formed only to cross the first substrate electrode pairs. However, in FIG. 3, barriers are formed to cross the first substrate electrode pairs and at the same time horizontal barriers 13a are also formed in a direction where the first substrate electrode pairs are formed.

For reference, the barriers formed to cross the first substrate electrode pairs are called vertical barriers 13 and the barriers formed in the same direction as the first substrate electrode pairs are called horizontal barriers 13a. However, as known from FIG. 3, four corner portions of the discharge region 21 are located at a distance away from the main discharge region 22, even though the well type barriers are formed.

The well type barriers are formed to prevent loss generated when ultraviolet rays by discharge reach a boundary portion of the cell from occurring in the stripe type barriers.

However, the stripe type barrier structure and the well type barrier structure of the related art plasma display panel have following problems.

First, in the stripe type barriers, although exhaust is easy, ultraviolet rays and visible rays may move toward the adjacent cell in vertical direction. In this case, error discharge and crosstalk may occur. Also, since the corner portions of the discharge region are away from the main discharge region, luminance is reduced.

Furthermore, in the well type barriers, although crosstalk between the adjacent cells can be avoided, exhaust is poor. For this reason, error discharge due to remaining gas may occur. Also, in the same manner as the stripe type barriers, since the corner portions of the discharge region are away from the main discharge region, luminance is reduced.

SUMMARY OF THE INVENTION

Accordingly, the present invention is directed to a plasma display panel that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.

An object of the present invention is to provide a plasma display panel which prevents luminance from being reduced in corner portions of a discharge region and improves exhaust ability.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the scheme particularly pointed out in the written description and claims hereof as well as the appended drawings.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, a plasma display panel according to the first embodiment of the present invention includes a first substrate; a plurality of first substrate electrode pairs formed on the first substrate at constant intervals in one direction; a first dielectric layer formed on the first substrate including the first substrate electrode pairs; a second substrate; a plurality of second substrate electrodes formed on the second substrate at constant intervals to cross the first substrate electrode pairs; a second dielectric layer formed on the second substrate including the second substrate electrodes; first barriers formed on the second dielectric layer with the second substrate electrodes interposed therebetween; auxiliary barriers formed at both sides of the first barriers; a phosphor layer formed on the second dielectric layer including the first barriers; and second barriers formed in a boundary portion of upper and lower discharge cells on the second substrate to have a width which increases toward the first barriers from a central portion and to be separated from the first barriers.

A plasma display panel according to the second embodiment of the present invention includes: a first substrate; a plurality of first substrate electrode pairs formed on the first substrate at constant intervals in one direction; a first dielectric layer formed on the first substrate including the first substrate electrode pairs; a second substrate; a plurality of second substrate electrodes formed on the second substrate at constant intervals to cross the first substrate electrode pairs; a second dielectric layer formed on the second substrate including the second substrate electrodes; barriers formed on the second dielectric layer with the second substrate electrodes interposed therebetween; a phosphor layer formed on the second dielectric layer including the barriers; and a plurality of projections formed on the phosphor layer between the respective barriers at constant intervals in the same direction as the barriers.

A plasma display panel according to the third embodiment of the present invention includes: a first substrate; a plurality of first substrate electrode pairs formed on the first substrate; a second substrate; second substrate electrodes formed on the second substrate to cross the first substrate electrode pairs; a first dielectric layer formed on the second substrate including the second substrate electrodes; barriers formed on the first dielectric layer in first and second directions; and a second dielectric layer formed on the first substrate including the first substrate electrode pairs at a predetermined height, having a groove of a predetermined width and depth in the first and second directions on a surface region.

A plasma display panel according to the fourth embodiment of the present invention includes: a first substrate; a plurality of first substrate electrode pairs formed on the first substrate at constant intervals in one direction; a second substrate; a plurality of second substrate electrodes formed on the second substrate at constant intervals to cross the first substrate electrode pairs; first barriers formed on the second substrate with the second substrate electrodes interposed therebetween; and at least two or more second barriers formed in a boundary portion of upper and lower discharge cells on the second substrate to be separated from the first barriers and to maintain predetermined intervals among one another.

A plasma display panel according to the fourth embodiment of the present invention includes: a first substrate; a plurality of first substrate electrode pairs formed on the first substrate at constant intervals in one direction; a second substrate; a plurality of second substrate electrodes formed on the second substrate at constant intervals to cross the first substrate electrode pairs; first barriers formed on the second substrate with the second substrate electrodes interposed therebetween; and second barriers formed in a boundary portion of upper and lower discharge cells on the second substrate to be separated from the first barriers and to have a width of a surface opposite to the first barriers, which increases at a constant ratio or more than a width of the first barriers.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described in detail with reference to the following drawings in which like reference numerals refer to like elements wherein:

FIG. 1 is a layout of a general AC type plasma display panel of three-electrode area discharge type;

FIG. 2a is a layout of a related plasma display panel having a stripe type barrier structure;

FIG. 2b is a sectional view taken along line I-I′ of FIG. 2a;

FIG. 3 is a layout of a related art plasma display panel having a well type barrier structure;

FIG. 4a is a layout of a plasma display panel according to the first embodiment of the present invention;

FIG. 4b is a perspective view showing a barrier structure of FIG. 4a;

FIG. 5 is a sectional view taken along line I-I′ of FIG. 4a;

FIG. 6 shows another embodiment of auxiliary barriers according to the present invention;

FIGS. 7a to 7c show another embodiment of second barriers according to the present invention;

FIG. 8 is an exploded perspective view showing a plasma display panel according to the second embodiment of the present invention;

FIG. 9 is a sectional view showing an assembly state of FIG. 8;

FIG. 10 is an exploded perspective view showing another projection shape of FIG. 8;

FIGS. 11 to 14 are sectional views showing a plasma display panel according to the third embodiment of the present invention; and

FIGS. 15 to as shown in FIG. 16, at least two or more the second barriers 344a are formed to be separated at a constant distance in the same direction as the first barriers 344.

Accordingly, the first barriers 344 are separated from the second barriers 344a to form an exhaust path. The second barriers 344a can prevent crosstalk that may occur between adjacent cells due to charge particles from occurring.

Meanwhile, in FIGS. 17 and 18 16 and 17, the barriers are formed in a boundary portion between the cells to have a greater width than those of FIGS. 15 and 16 FIG. 15, so that contrast can be improved and at the same time an exhaust path can be obtained. In a typical plasma display panel, a black matrix is formed to improve contrast. The barriers may be applied to a plasma display panel having no black matrix.

Namely, as shown in FIG. 17 16, the first barriers 344 are formed to cross the first substrate electrode pairs 341 and 342, and at the same time the second barriers 344a are formed in a boundary portion between upper and lower cells between the first barriers 344 to have a width increased by a predetermined ratio(about two times) as compared with the first barriers 344. Thus, exhaust ability and contrast can be improved.

Furthermore, as shown in FIG. 18 17, a portion of the second barriers 344a opposite to the cell has a first width, and its central portion having a second width of H shape smaller than the first width. At this time, the first width is two times or more of the second width. Consequently, if the barriers are formed as shown in FIG. 17 16, contrast is more effective. If the barriers are formed as shown in FIG. 18 17, exhaust ability is more effective.

The plasma display panel according to the fourth embodiment of the present invention has the following advantages.

Since a plurality of the horizontal barriers having an exhaust path are formed, exhaust ability can be improved, and crosstalk and error discharge can be prevented from occurring. Furthermore, since the horizontal barriers have a greater width, contrast can be improved in the plasma display panel having no black matrix layer as well as the plasma display panel having a black matrix layer.

The foregoing embodiments are merely exemplary and are not to be construed as limiting the present invention. The present teachings can be readily applied to other types of apparatuses. The description of the present invention is intended to be illustrative, and not to limit the scope of the claims. Many alternatives, modifications, and variations will be apparent to those skilled in the art.

Claims

1. A plasma display panel comprising:

a first substrate;

a plurality of first substrate electrode pairs formed on the first substrate at constant intervals in one direction;

a first dielectric layer formed on the first substrate including the first substrate electrode pairs;

a second substrate;

a plurality of second substrate electrodes formed on the second substrate at constant intervals to cross the first substrate electrode pairs;

a second dielectric layer formed on the second substrate including the second substrate electrodes;

first barriers formed on the second dielectric layer with the second substrate electrodes interposed therebetween;

auxiliary barriers formed at both sides of the first barriers;

a phosphor layer formed on the second dielectric layer including the first barriers; and

second barriers formed in a boundary portion of upper and lower discharge cells on the second substrate to have a width which increases toward the first barriers from a central portion and to be separated from the first barriers.

2. A plasma display panel of claim 1, wherein the auxiliary barriers have a greater lower area than an upper area at both sides of the first barriers.

3. A plasma display panel of claim 2, wherein the auxiliary barriers are formed at both sides of the first barriers in a round shape.

4. A plasma display panel of claim 1, wherein the auxiliary barriers are layered on a lower portion of both sides of the first barriers at a predetermined height and width.

5. A plasma display panel of claim 1, wherein the second barriers have a greater width toward a lower portion.

6. A plasma display panel of claim 1, wherein the second barriers have a round shape at a surface opposite to the first substrate electrode pairs.

7. A plasma display panel of claim 1, wherein the second barriers are separated at their central portion by X axis, Y axis, or X and Y axes.

8. A plasma display panel comprising:

a first substrate;

a plurality of first substrate electrode pairs formed on the first substrate at constant intervals in one direction;

a second substrate;

a plurality of second substrate electrodes formed on the second substrate at constant intervals to cross the first substrate electrode pairs;

first barriers formed on the second substrate with the second substrate electrodes interposed therebetween; and

at least two or more second barriers formed in a boundary portion of upper and lower discharge cells on the second substrate to be separated from the first barriers and to maintain predetermined intervals among one another.

9. A plasma display panel of claim 8, wherein the second barriers are formed in the same direction as the first substrate electrode pairs.

10. A plasma display panel of claim 8, wherein the second barriers are formed in the same direction as the first barriers.

11. A plasma display panel of claim 8, wherein the second barriers have either a horizontal width or a vertical width equivalent to the first barriers.

12. A plasma display panel comprising:

a first substrate;

a plurality of first substrate electrode pairs formed on the first substrate at constant intervals in one direction;

a second substrate;

a plurality of second substrate electrodes formed on the second substrate at constant intervals to cross the first substrate electrode pairs;

first barriers formed on the second substrate with the second substrate electrodes interposed therebetween; and

second barriers formed in a boundary portion of upper and lower discharge cells on the second substrate to be separated from the first barriers and to have a width of a surface opposite to the first barriers, which increases at a constant ratio or more than a width of the first barriers.

13. A plasma display panel of claim 12, wherein the second barriers have concave and convex portions on a surface opposite to the first barriers.

14. A plasma display panel (PDP), comprising:

a substrate;

at least one electrode arranged on the substrate;

at least one first barrier formed on the substrate parallel to the at least one electrode;

at least one second barrier formed on the substrate perpendicular to the at least one electrode;

a phosphor layer formed over the at least one electrode, wherein at least one side of the first barrier, and at least one side of the second barrier are configured to perform light emission, wherein a thickness of a top portion of the first barrier is less than a thickness of a bottom portion of the first barrier, and wherein a thickness of at least one of longitudinal end portions of the second barrier adjacent to the at least one first barrier is greater than a thickness of a middle portion of the second barrier.

15. The plasma display panel of claim 14, wherein at least one portion of the side of the first barrier is sloped such that an effective light-emitting surface area of the phosphor layer that receives ultraviolet rays is increased.

16. The plasma display panel of claim 15, wherein at least one of top and bottom portions of the side of the first barrier is sloped.

17. The plasma display panel of claim 15, wherein an entire portion of the side of the first barrier is sloped.

18. The plasma display panel of claim 14, wherein at least one portion of the side of the first barrier is faced toward ultraviolet rays such that an effective light-emitting surface area of the phosphor layer that receives the ultraviolet rays is increased.

19. The plasma display panel of claim 18, wherein at least one of top and bottom portions of the side of the first barrier is faced toward the ultraviolet rays.

20. The plasma display panel of claim 18, wherein an entire portion of the side of the first barrier is faced toward the ultraviolet rays.

21. A plasma display panel (PDP), comprising:

a substrate;

at least one electrode arranged on the substrate;

at least one first barrier formed on the substrate;

at least one second barrier formed on the substrate; and

a phosphor layer formed over the at least one electrode, wherein at least one side of the first barrier, and at least one side of the second barrier are configured to perform light emission, wherein a thickness of a top portion of the first barrier is less than a thickness of a bottom portion of the first barrier, and wherein a thickness of at least one of longitudinal end portions of the second barrier adjacent to the at least one first barrier is greater than a thickness of a middle portion of the second barrier.

22. The plasma display panel of claim 21, wherein at least one portion of the side of the first barrier is sloped such that an effective light-emitting surface area of the phosphor layer that receives ultraviolet rays is increased.

23. The plasma display panel of claim 22, wherein at least one of top and bottom portions of the side of the first barrier is sloped.

24. The plasma display panel of claim 22, wherein an entire portion of the side of the first barrier is sloped.

25. The plasma display panel of claim 21, wherein at least one portion of the side of the first barrier is faced toward ultraviolet rays such that an effective light-emitting surface area of the phosphor layer that receives the ultraviolet rays is increased.

26. The plasma display panel of claim 25, wherein at least one of top and bottom portions of the side of the first barrier is faced toward the ultraviolet rays.

27. The plasma display panel of claim 25, wherein an entire portion of the side of the first barrier is faced toward the ultraviolet rays.

28. The plasma display panel of claim 21, wherein the at least one first barrier is substantially parallel to the at least one electrode.

29. The plasma display panel of claim 21, wherein the at least one second barrier is substantially perpendicular to the at least one electrode.

30. The plasma display panel of claim 21, wherein the at least one first barrier is substantially perpendicular to the at least one second barrier.

31. A plasma display panel (PDP), comprising:

a substrate;

at least one electrode arranged on the substrate;

at least one first barrier formed on the substrate substantially perpendicular to the at least one electrode;

at least one second barrier formed on the substrate substantially parallel to the at least one electrode; and

a phosphor layer formed over the at least one electrode, wherein at least one side of the first barrier, and at least one side of the second barrier are configured to perform light emission, wherein a thickness of a top portion of the first barrier is less than a thickness of a bottom portion of the first barrier, and wherein a thickness of at least one of longitudinal end portions of the second barrier adjacent to the at least one first barrier is greater than a thickness of a middle portion of the second barrier.

32. The plasma display panel of claim 31, wherein at least one portion of the side of the first barrier is sloped such that an effective light-emitting surface area of the phosphor layer that receives ultraviolet rays is increased.

33. The plasma display panel of claim 32, wherein at least one of top and bottom portions of the side of the first barrier is sloped.

34. The plasma display panel of claim 32, wherein an entire portion of the side of the first barrier is sloped.

35. The plasma display panel of claim 31, wherein at least one portion of the side of the first barrier is faced toward ultraviolet rays such that an effective light-emitting surface area of the phosphor layer that receives the ultraviolet rays is increased.

36. The plasma display panel of claim 35, wherein at least one of top and bottom portions of the side of the first barrier is faced toward the ultraviolet rays.

37. The plasma display panel of claim 35, wherein an entire portion of the side of the first barrier is faced toward the ultraviolet rays.

38. An AC-type plasma display panel (PDP), comprising:

a first substrate;

at least one pair of scan and sustain electrodes arranged on the first substrate;

a first dielectric layer formed over the at least one pair of scan and sustain electrodes;

a second substrate;

at least one address electrode arranged on the second substrate substantially perpendicular to the at least one pair of scan and sustain electrodes;

a second dielectric layer formed over the at least one address electrode;

at least one first barrier formed on the second substrate;

at least one second barrier formed on the second substrate; and

a phosphor layer formed over an exposed portion of the second dielectric layer, at least one side of the first barrier, and at least one side of the second barrier in order to perform light emission, wherein a thickness of a top portion of the first barrier is less than a thickness of a bottom portion of the first barrier, and wherein a thickness of at least one of left and right end portions of the second barrier adjacent to the at least one first barrier is greater than a thickness of a middle portion of the second barrier.

39. The AC-type plasma display panel of claim 38, wherein at least one portion of the side of the first barrier is sloped such that an effective light-emitting surface area of the phosphor layer that receives ultraviolet rays is increased.

40. The AC-type plasma display panel of claim 39, wherein at least one of top and bottom portions of the side of the first barrier is sloped.

41. The AC-type plasma display panel of claim 39, wherein an entire portion of the side of the first barrier is sloped.

42. The AC-type plasma display panel of claim 38, wherein at least one portion of the side of the first barrier is faced toward ultraviolet rays such that an effective light-emitting surface area of the phosphor layer that receives the ultraviolet rays is increased.

43. The AC-type plasma display panel of claim 42, wherein at least one of top and bottom portions of the side of the first barrier is faced toward the ultraviolet rays.

44. The AC-type plasma display panel of claim 42, wherein an entire portion of the side of the first barrier is faced toward the ultraviolet rays.

45. The AC-type plasma display panel of claim 38, wherein the at least one first barrier is substantially parallel to the at least one address electrode.

46. The AC-type plasma display panel of claim 38, wherein the at least one second barrier is substantially perpendicular to the at least one address electrode.

47. The AC-type plasma display panel of claim 38, wherein the at least one first barrier is substantially perpendicular to the at least one second barrier.