KR20050118871A - Plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel that removes a luminance step between a main screen and a PIP screen when the PIP screen is implemented.

A plasma display panel according to the present invention includes: a first substrate and a second substrate disposed to face each other; Barrier ribs disposed in a space between the first substrate and the second substrate to partition a plurality of discharge cells; Phosphor layers formed in the respective discharge cells; Address electrodes formed on one of the first substrate and the second substrate; And display electrodes extending in a direction crossing the address electrodes on the first substrate, wherein the display electrodes include a first display electrode group and a second display electrode group separated on both sides with respect to the extending direction thereof. .

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

The present invention relates to a plasma display panel (PDP, hereinafter referred to as PDP) for implementing a PIP screen on a main screen.

In general, PDP excites phosphors by vacuum ultra-violet (VUV) emitted from plasma obtained through gas discharge, and the visible light of red (R), green (G), and blue (B) generated at this time is excited. It is a display device for implementing an image using. This PDP is capable of realizing a 60-inch or larger screen with a thickness of less than 10 cm. Since it is a self-luminous display device such as a CRT, it has no characteristic of distortion due to color reproduction and viewing angle. It is gaining attention as a TV and industrial flat panel display that have strengths in terms of productivity and cost.

The AC PDP includes a back substrate and a front substrate, wherein address electrodes are formed in one direction on the back substrate, and a dielectric layer is formed on the front surface of the back substrate while covering the address electrodes, and disposed between each address electrode on the dielectric layer. Stripe-shaped partition walls are formed, and red, green, and blue (B) phosphor layers are formed between the partition walls, and one surface of the front substrate facing the rear substrate is formed. In the intersecting direction with the address electrodes, display electrodes including a pair of transparent electrodes and bus electrodes are formed, and a dielectric layer and an MgO protective film are sequentially formed on the entire front substrate while covering the display electrodes. A discharge cell is formed at a point where the address electrodes on the rear substrate and the pair of display electrodes on the front substrate cross each other. More than millions of unit discharge cells are arranged in a matrix in the PDP. The discharge cells of the AC PDP arranged in a matrix form are driven using memory characteristics.

In more detail, in order to generate a discharge between the X electrode and the Y electrode constituting the pair of display electrodes, a potential difference of a specific voltage or more is required, and the voltage at the boundary is called a firing voltage (Vf). At this time, when the scan pulse and the address voltage Va are applied to the Y electrode and the address electrode, the discharge is started between the two electrodes to form a plasma in the selected discharge cell, and the electrons and ions in the plasma have opposite polarities. The current flows toward the electrode having a current.

On the other hand, a dielectric layer is applied to each electrode of the AC PDP so that most of the transferred space charges are accumulated on the dielectric layer having the opposite polarity, so that the net space potential between the Y electrode and the address electrode is changed from the originally applied address voltage ( Smaller than Va), the discharge becomes weak and the address discharge disappears. At this time, a relatively small amount of electrons are accumulated in the X electrode, and a relatively large amount of ions are accumulated in the Y electrode, and charges accumulated on the dielectric layers covering the X electrode and the Y electrode are wall charged (Qw). The space voltage formed between the XY electrodes by these wall charges is referred to as wall voltage (Vw).

Subsequently, when a constant voltage (Vs: discharge holding voltage) is applied between the X electrode and the Y electrode, the value (Vs + Vw) of the sum of the magnitudes of the discharge holding voltage Vs and the wall voltage Vw starts discharge. When the voltage is higher than the voltage Vf, discharge occurs in the discharge cell, and the vacuum ultraviolet light VUV generated at this time excites the corresponding phosphor and emits visible light through the transparent front substrate.

However, when there is no address discharge between the Y electrode and the address electrode (that is, when no address voltage Va is applied), there is no wall charge accumulated between the XY electrodes, and as a result, there is no wall voltage between the XY electrodes. . At this time, only the discharge holding voltage Vs applied between the X-Y electrodes is formed in the discharge cell, which is lower than the discharge start voltage Vf, so that the gas space between the X-Y electrodes is not discharged.

The PDP driven as described above implements another screen in the main screen, that is, a picture in picture (PIP) or POP screen (hereinafter, referred to as a 'PIP screen') in order to meet various demands of consumers. However, since the PDP is formed by extending the X electrode and the Y electrode from one side to the other side between the front substrate and the rear substrate, when the PIP screen is turned on, the discharge voltage applied to the X electrode and the Y electrode is applied. In the main screen and the PIP screen, the difference between the main screen and the PIP screen, causing the flashing on the main screen by the brightness of the PIP screen, and also affects the brightness has a disadvantage of generating a luminance step between the main screen and the PIP screen . Therefore, high resolution PDP has a disadvantage in that it is difficult to implement a PIP screen.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a plasma display panel that eliminates luminance steps between a main screen and a PIP screen when a PIP screen is implemented.

Plasma display panel according to the present invention,

A first substrate and a second substrate disposed to face each other;

Barrier ribs disposed in a space between the first substrate and the second substrate to partition a plurality of discharge cells;

Phosphor layers formed in the respective discharge cells;

Address electrodes formed on one of the first substrate and the second substrate; And

Display electrodes extending in a direction crossing the address electrodes on the first substrate,

The display electrodes include a first display electrode group and a second display electrode group that are separated on both sides with respect to the extending direction thereof.

The display electrode is separated into a first display electrode group and a second display electrode group from the center portion to both sides with respect to the extending direction thereof.

The first display electrode group and the second display electrode group are separated from each other by the same length. In this case, the separated ends of the first display electrode group and the second display electrode group are disposed in a straight line along the extending direction of the address electrode.

In the first display electrode group and the second display electrode group, the length of the first display electrode group is longer than the length of the second display electrode group, and the length of the second display electrode group is greater than the length of the first display electrode group. Alternately form long batches. In this case, the distal ends of the first display electrode group and the second display electrode group are arranged in a zigzag state along the extending direction of the address electrode.

Separate front ends of the first display electrode group and the second display electrode group are disposed corresponding to the partition wall. At this time, it is preferable that the interval between the separated tip is narrower than the width of the partition wall.

A resistor is interposed between the separated ends of the first display electrode group and the second display electrode group. The resistor has an electrical resistance higher than that of the first display electrode group and the second display electrode group.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a partially exploded perspective view schematically showing a plasma display panel according to the present invention.

Referring to the PDP, the PDP according to the present embodiment has a surface facing seal between the first substrate (1, hereinafter referred to as "front substrate") and the second substrate (hereinafter, referred to as "back substrate"). It is formed into a structure. In the space between the front substrate 1 and the back substrate 3, a plurality of partition walls 5 are arranged to form a plurality of discharge cells 7R, 7G, and 7B which can cause plasma discharge. The discharge cells 7R, 7G, and 7B are filled with a mixed discharge gas of Ne-Xe, and the phosphors are formed by phosphors of red (R), green (G), and blue (B) colors printed on the inner wall thereof. Layers 9R, 9G and 9B are formed.

The address electrodes 11 extend along the y-axis direction of the drawing on the back substrate 3, and the address electrodes 11 adjacent to each other are spaced apart from each other in the x-axis direction corresponding to the discharge cells 7R, 7G, and 7B. Is placed. In the present exemplary embodiment, the address electrode 11 is provided on the rear substrate 3, but the present invention is not limited thereto, and the address electrode 11 may be appropriately provided on the front substrate 3, the partition 5, and the like. The display electrodes 13 and 15 extend on the front substrate 1 in a direction intersecting the address electrodes 11, that is, in the x-axis direction of the drawing, and adjacent display electrodes 13 and 15 are formed on the front substrate 1. It is arranged at intervals corresponding to the discharge cells 7R, 7G, 7B in the y axis direction.

The barrier ribs 5 provided in the space between the front substrate 1 and the rear substrate 3 have a first barrier member 5a and a second barrier rib which form discharge cells 7R, 7G, and 7B in a closed form. And a member 5b. The first partition member 5a extends in the y-axis direction and is disposed in parallel with the other first partition member 5a adjacent to each other, and the second partition member 5b is the first partition member 5a. It extends in the x-axis direction so as to intersect with and is disposed in parallel with other neighboring second partition wall members 5b, so that the discharge cells 7R, 7G, and 7B necessary for plasma discharge are partitioned.

The present embodiment exemplifies a closed barrier rib structure in which discharge cells 7R, 7G, and 7B are formed by first and second barrier rib members 5a and 5b extending in the y-axis direction and the x-axis direction and intersecting with each other. However, the present invention can also be applied to a stripe-type partition wall structure formed by the first partition wall member 5a. In addition, even when the first and second partition members 5a and 5b are used, the discharge cells 7R, 7G, and 7B may be formed in various shapes such as an octagonal shape or a hexagonal shape depending on the shape of the first partition member 5a. .

The address electrodes 11 are covered with the first dielectric layer 17 to form wall charges in the discharge cells 7R, 7G, and 7B to cause address discharge. The first dielectric layer 17 is preferably formed of a white dielectric so as to secure reflectance of visible light.

The display electrodes 13 and 15 intersected with the address electrodes 11 cause an address discharge with the address electrode 11, and then discharge cells to cause sustain discharge in the discharge cells 7R, 7G, and 7B. It consists of the X electrode 13 and the Y electrode 15 arrange | positioned in mutually opposing state centering on (7R, 7G, 7B), and are covered by the dielectric layer 19 and MgO protective film 21. As shown in FIG.

The X electrode 13 and the Y electrode 15 are protruding electrodes 13a and 15a which protrude toward the center of the discharge cells 7R, 7G and 7B, and supply current to the protruding electrodes 13a and 15a. It consists of bus electrodes 13b and 15b. The bus electrodes 13b and 15b are formed to correspond to each of the discharge cells 7R, 7G, and 7B while extending along a direction (x axis direction) intersecting with the longitudinal direction of the address electrode 11. The protruding electrodes 13a and 15a protrude from the bus electrodes 13b and 15b toward the center of each of the discharge cells 7R, 7G and 7B, respectively. In addition, the protruding electrodes 13a and 15a may protrude one from each of the discharge cells 7R, 7G, and 7B as shown in the drawing, but may be formed in a stripe type continuously connected to several discharge cells 7R, 7G, and 7B. have.

In this case, the protruding electrodes 13a and 15a play a role of causing plasma discharge in the discharge cells 7R, 7G, and 7B, and are formed of a transparent electrode made of transparent indium tin oxide (ITO) to secure luminance. desirable. In addition, the bus electrodes 13b and 15b may be made of a metal such as aluminum (Al) to compensate for the high electrical resistance of the protruding electrodes 13a and 15a to ensure current conduction.

FIG. 2 is a schematic conceptual diagram of a plasma display apparatus including the plasma display panel of FIG. 1.

Referring to the drawings, the display electrodes 13 and 15 (shown as X1, X2, ..., Xn, Y1, Y2, ..., Yn in FIG. 2) will be described. They are formed of the first display electrode group G1 and the second display electrode group G2 which are separated on both sides (left and right in the drawing) with respect to the extension direction (x-axis direction), respectively. Since the first display electrode group G1 and the second display electrode group G2 are independently controlled by separate driving units, one display electrode group (for example, the first display electrode group) when the PIP screen is implemented on the main screen. The discharge sustain voltage applied to the second display electrode group (eg, the second display electrode group) is applied to remove the luminance step that may occur between the main screen and the PIP screen.

To this end, the plasma display apparatus for driving the PDP includes a PDP configured as described above, a first display electrode driver 23 controlling the first display electrode group G1 of the PDP, and a second display electrode group separately from the PDP. A second display electrode driver 25 for controlling G2 and an address electrode driver 27 for controlling the address electrode 11 (shown as A1, A2, ..., An in FIG. 2) are provided. That is, the first display electrode group G1 interacts with the corresponding address electrode 11 to drive one side (left side in the drawing) of the PDP, and the second display electrode group G2 corresponds to the address electrode 11 corresponding thereto. ) To drive the other side of the PDP (right side of the drawing). The display electrodes 13 and 15 are separated into a first display electrode group G1 and a second display electrode group G2, and the electrode groups G1 and G2 are respectively formed with the first display electrode driver 23. By controlling the second display electrode driver 25, the control logic of the Y electrode 15 of the controller for controlling the first and second display electrode drivers 23 and 25 can be simplified.

Of course, the first display electrode driver 23, the second display electrode driver 25, and the address electrode driver 27 are controlled by a controller (not shown) that receives an image signal. In addition, the first display electrode driver 23 may be separately formed or integrally formed with the X electrode driver 23a and the Y electrode driver 23b. As such, the second display electrode driver 25 may be separately formed or integrally formed with the X electrode driver 25a and the Y electrode driver 25b.

The first display electrode group G1 and the second display electrode group G2 are separated from both sides of the PDP in the longitudinal direction (x-axis direction) of the display electrodes 13 and 15. Accordingly, the main screen is displayed by the X and Y electrodes 13 and 15 of the first and second display electrode groups G1 and G2 and the address electrodes 11 corresponding thereto. In this state, the PIP screen is turned on. ), The PIP screen is displayed by the X and Y electrodes 13 and 15 of the second display electrode group G1 and the address electrodes 11 corresponding thereto. In this case, since the first and second display electrode groups G1 and G2 are separated and separately formed, the first display electrode group G2 irrelevant to displaying the PIP screen acts only to display the main screen. The luminance step is not generated between the PIP screen and the PIP screen.

The first display electrode group G1 and the second display electrode group G2 acting as described above may be separated and formed in various structures. As illustrated in FIG. 2, the first display electrode group G1 and the second display electrode group G2 may be separated and formed to have the same length. As a result, the separated ends of the first display electrode group G1 and the second display electrode group G2 are disposed in a straight line along the extension direction (y axis direction) of the address electrode 11.

3 is a partial plan view of a plasma display panel according to a first embodiment of the present invention.

Referring to the drawings, the first and second display electrode groups G1 and G2 will be described. The separated tips of the first and second display electrode groups G1 and G2 are partition walls 5, and more specifically, It is arrange | positioned correspondingly on the 1st partition member 5a. As the distal ends of the first and second display electrode groups G1 and G2 are provided on the first partition member 5a which is a non-discharge region, the first and second display electrode groups G1 and G2 are separated. It is possible to form sustain discharge of all the discharge cells 7R, 7G, and 7B while eliminating the luminance step, thereby preventing the reduction of the luminance.

In addition, the resistor 29 may be interposed between the distal ends of the first and second display electrode groups G1 and G2. The resistor 29 separates the first display electrode group G1 and the second display electrode group G1 to the extent that the sustain discharge voltage is interrupted, while the first display electrode group G1 and the second display electrode group G1 are separated. By grounding to the opposite side to prevent unnecessary mis-discharge, that is, cross talk (Cross Talk) occurs between them. To this end, the resistor 29 preferably has a higher electrical resistance than that of the first display electrode group G1 and the second display electrode group G2.

4 is a schematic conceptual diagram of a plasma display apparatus including a plasma display panel according to a second embodiment of the present invention.

The second embodiment will be described with reference to the drawings. Since the overall configuration is similar to that of the first embodiment, a detailed description of the same parts will be omitted here and different parts will be described in detail.

In the second embodiment, the first display electrode group G1 and the second display electrode group G2 are formed to have different lengths, unlike in the first embodiment in which the first and second display electrode groups G2 have the same length. The first display electrode group G1 and the second display electrode group G2 are alternately formed long and short. That is, the length of the first display electrode group G1 is longer than the length of the second display electrode group G2, and the length of the second display electrode group G2 is longer than the length of the first display electrode group G1. The arrangement is alternately formed in the address electrode 11 extension direction (y axis direction). For example, the Y1 electrode of the first display electrode group G1 is formed long and the Y1 electrode of the second display electrode group G2 separated from the first electrode group G2 is formed short, so that the separated ends are disposed to the right. The X1 electrode of the display electrode group G1 is shortly formed, and the X1 electrode of the second display electrode group G2 separated from the second electrode is formed to be long, and the separated tips are disposed to the left. As the distal ends of the first and second display electrode groups G1 and G2 are repeatedly arranged alternately to the right and left sides, the distal ends of the address electrodes 11 extend in the y direction. Zigzag) along the axial direction).

Such a zigzag arrangement reduces the dark phenomenon by dispersing it on the PDP without concentrating the dark effect positions formed between the separated first and second display electrode groups G1 and G2. do.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

As described above, according to the present invention, the display electrodes are separated into the first display electrode group and the second display electrode group, so that the luminance step between the main screen and the PIP screen is eliminated when the PIP screen is implemented. In addition, the distal end of the first display electrode group and the second display electrode group may be disposed in a zigzag state at the center of the display electrode in the extending direction to remove dark effects.

1 is a partially exploded perspective view schematically showing a plasma display panel according to the present invention.

FIG. 2 is a schematic conceptual diagram of a plasma display apparatus including the plasma display panel of FIG. 1.

3 is a partial plan view of a plasma display panel according to a first embodiment of the present invention.

4 is a schematic conceptual diagram of a plasma display apparatus including a plasma display panel according to a second embodiment of the present invention.

Claims (9)

A first substrate and a second substrate disposed to face each other; Barrier ribs disposed in a space between the first substrate and the second substrate to partition a plurality of discharge cells; Phosphor layers formed in the respective discharge cells; Address electrodes formed on one of the first substrate and the second substrate; And Display electrodes extending in a direction crossing the address electrodes on the first substrate, The display electrodes include a first display electrode group and a second display electrode group separated on both sides with respect to the extending direction thereof. The method of claim 1, And the display electrode is separated into a first display electrode group and a second display electrode group from the center portion to both sides with respect to the extending direction thereof. The method of claim 1, And the first display electrode group and the second display electrode group are separated and formed in the same length. The method of claim 1, The separated front ends of the first display electrode group and the second display electrode group are disposed in a straight line along the extending direction of the address electrode. The method of claim 1, In the first display electrode group and the second display electrode group, the length of the first display electrode group is longer than the length of the second display electrode group, and the length of the second display electrode group is greater than the length of the first display electrode group. A plasma display panel which alternately forms a long arrangement. The method of claim 1, The separated front ends of the first display electrode group and the second display electrode group are disposed in a zigzag state along the extending direction of the address electrode. The method of claim 1, The separated front ends of the first display electrode group and the second display electrode group are disposed to correspond to the partition wall. The method of claim 1, And a resistor interposed between the first ends of the first display electrode group and the second display electrode group. The method of claim 8, And the resistor has an electrical resistance higher than that of the first display electrode group and the second display electrode group.