KR20080034729A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to effectively improve a dark/bright contrast by arranging a bus electrode on non-discharge cells between double barrier rib structures. A plasma display panel includes a front and rear substrates(110,210), a barrier rib(240), bus electrodes(140), transparent electrodes(130), and a front dielectric layer(150). The barrier rib defines plural discharge cells between the front and rear substrates. The barrier rib is formed in two layers to form non-discharge cells in a cross direction and colored to decrease an external ray reflection. The bus electrodes are formed to traverse the front panel on the front substrate over the non-discharge cells. The transparent electrodes are electrically connected to the bus electrodes and generate discharges in the discharge cells. The front dielectric layer buries the bus and transparent electrodes on the front panel and is colored to decrease the external ray reflection.

Description

Plasma display panel {Plasma display panel}

1 is an exploded perspective view showing a part of a typical AC plasma display panel in order to illustrate the problem to be solved by the present invention.

2A and 2B are plan views illustrating a part of a plasma display panel having an out-bus structure of a double partition and an in-bus structure of a double partition to illustrate the problem to be solved by the present invention.

3 is a partially cutaway perspective view of a plasma display panel according to an embodiment of the present invention.

4 is a plan view illustrating an electrode structure of the plasma display panel of FIG. 3.

<Description of Symbols for Main Parts of Drawings>

110: front substrate 130: transparent electrode

140: bus electrode 150: front dielectric layer

160: protective layer 210: back substrate

220: address electrode 230: back dielectric layer

240: partition 250: discharge cell

260: phosphor layer 270: non-discharge cell

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel capable of improving efficiency and bright room contrast.

A plasma display panel (PDP) is a flat panel display panel that emits visible light by exciting phosphors by ultraviolet rays generated by gas discharge. Plasma display panels can be made thinner and have large screens with high resolution, making them popular as next-generation thin flat panel display panels.

1 is an exploded perspective view showing a part of a typical AC plasma display panel in order to illustrate the problem to be solved by the present invention. Accordingly, the applicant discloses that the plasma display panel shown in FIG. 1 is not recognized as a known technique. Typically, the plasma display panel includes a front substrate 11 disposed on the user side and a rear substrate 21 disposed on the chassis side. The front substrate 11 includes a transparent electrode 13, a bus electrode 14, a front dielectric layer 15, and a protective layer 16. The rear substrate 21 has an address electrode 22 and a back dielectric layer 23. There is a partition 24. The plurality of electrodes 13, 14, 22, and the partition wall 24 define discharge cells 25, and phosphors having red, green, and blue colors are coated on the discharge cells 25, respectively. 26) is formed. In addition, after the two substrates 11 and 21 are sealed, a discharge gas such as neon or xenon is filled. When a predetermined voltage is applied to the discharge electrode to drive the plasma display panel, discharge occurs. When the discharge occurs, vacuum ultraviolet rays are generated from the discharge gas, and the vacuum ultraviolet rays are applied to the phosphor layer 25 applied to the discharge cells 25. Excitation to emit visible light.

In such a plasma display panel, a double partition wall may be used to increase efficiency. The double barrier rib structure forms one of the barrier ribs in a matrix to have a non-discharge cell between the barrier ribs. Since the size of the discharge cell is reduced due to the presence of the non-discharge cells, the double barrier rib structure can be discharged with a smaller power consumption than the single barrier rib structure, thereby increasing efficiency. On the other hand, the non-discharge cell may provide a passage for discharging the impurity gas in the process of encapsulating the discharge gas and vacuum evacuation.

The double barrier rib structure may be an out-bus structure in which the bus electrode of the front substrate is positioned on the barrier rib, or an in-bus structure in which the bus electrode is located in the non-discharge cell. 2A and 2B are plan views illustrating a part of a plasma display panel having an out-bus structure of a double partition and an in-bus structure of a double partition to illustrate the problem to be solved by the present invention. Accordingly, Applicant also reveals that the plasma display panel shown in FIGS. 2A and 2B is not a recognized technique. In the discharge cell structures of FIGS. 2A and 2B, non-discharge cells 27 are formed below and above the discharge cells 25 of R, G, and B. In the discharge cell structure of FIGS. 2A and 2B, the transparent electrode 13 is the same, but in FIG. 2A, the X and Y bus electrodes 14 are disposed on the partition 24 between the discharge cell 25 and the non-discharge cell 27. FIG. 1B shows an in-bus structure in which the X and Y bus electrodes 14 run inside the discharge cell 25.

On the other hand, in the plasma display panel, efforts have been made to reduce the reflected luminance caused by the external light in order to increase the contrast. Complementary color application methods are used in which the barrier ribs of the rear substrate and the dielectric layers of the front substrate are complementary to each other, thereby preventing the visible light generated in the discharge cells from being absorbed and reducing the luminance while reducing the reflected luminance due to external light.

In the case of adopting the double partition structure in terms of discharge efficiency and applying complementary color relation to the panel configuration in order to increase the contrast intensity, the in-bus structure increases the proportion of the black portion as the black bus electrode enters the discharge cell. It improves but the efficiency decreases because the discharge space is reduced. In the out-bus structure, the efficiency is higher than that of the in-bus structure, but even if the black bus electrode is located on the partition wall, since the complementary color of the partition wall and the dielectric layer is already applied, the clear room contrast is not improved further.

The technical problem to be solved by the present invention is to provide a plasma display panel with further improved efficiency and clear room contrast.

The present invention is the front substrate and the rear substrate spaced apart facing each other; The space between the front substrate and the rear substrate is limited to a plurality of discharge cells, and the discharge cells are defined in a matrix and formed in a double direction in one direction to define non-discharge cells, and coloring to reduce external light reflection. Partition wall; A plurality of bus electrodes formed on the front substrate to cross the front substrate and pass over the non-discharge cell; A plurality of transparent electrodes electrically connected to the bus electrode and causing discharge in the discharge cell; And embedding the bus electrodes and the transparent electrodes on the front substrate and including a colored front dielectric layer to reduce external light reflection.

The plasma display panel may further include a back dielectric layer filling the address electrode on the back substrate.

In this case, the plasma display panel may further include a protective layer on the front dielectric layer.

Meanwhile, the bus electrode may include an X bus electrode and a Y bus electrode that extend in parallel to face each other, and the transparent electrode may include an X transparent electrode and a Y transparent electrode which face each other and cause a discharge. Here, at least a portion of each end of the X transparent electrode and the Y transparent electrode facing each other may be formed in a concave shape to form a long gap.

In addition, only the upper surface of the partition wall may be colored.

Hereinafter, with reference to the embodiments of the present invention shown in the accompanying drawings will be described in detail the present invention. On the other hand, the black portion mentioned below means the ratio of the black portion in the region other than the discharge cell. High black fraction may help to reduce external light reflection, and bus electrodes or black colored partition walls may contribute to higher black fraction.

3 is a partially cutaway perspective view of a plasma display panel according to an exemplary embodiment of the present invention, and FIG. 4 is a plan view illustrating an electrode structure of the plasma display panel of FIG. 3.

The plasma display panel illustrated in FIGS. 3 and 4 includes a front substrate 110 and a rear substrate 210 disposed to face the front substrate 110. The address electrode 220 is formed on the back substrate 210, and the back dielectric layer 230 covers the address electrode 220. A barrier rib 240 in a matrix form defining a discharge cell 250 is formed on the rear dielectric layer 230. Here, the partition wall 240 is configured in a double direction in one direction, for example, a horizontal direction, and the non-discharge cells 270 in which discharge does not occur are formed between the double partition walls 240. Since the partition wall 240 is dual, the size of the discharge cell 250 is reduced, so that the discharge can be performed at a smaller power consumption, thereby increasing the discharge efficiency.

The transparent substrate 130 and the bus electrode 140 are formed on the front substrate 110, and the front dielectric layer 150 filling the transparent electrode 130 and the bus electrode 140 is formed. The passivation layer 160 is formed on the front dielectric layer 150. Here, the partition wall 240 and the front dielectric layer 150 of the front substrate 110 are colored to form a complementary color relationship. For example, by employing the blue front dielectric layer 150 and the brown partition wall 240, the external light entering the front substrate 110 is reduced by the mixed color of blue and brown in complementary color relationship. On the other hand, each color of the partition wall 240 and the front dielectric layer 150 has a high ratio of reflecting or transmitting the light generated by the discharge cell 250, so that the external light can be effectively reduced without lowering the luminance of the emitted light. . At this time, the partition wall 240 may be colored only the upper surface of the partition wall 240 or the entire partition wall 240.

As described above, the bus electrode 140 passes through the non-discharge cell 270 of the front substrate 110 in the panel employing the double barrier rib and the complementary color relationship. As the bus electrode 140 leaves the discharge cell 250 and passes over the non-discharge cell 270, the decrease in the emission intensity in the discharge cell 250 due to the presence of the non-discharge cell 270 may be compensated to some extent. have. In addition, when the bus electrode 140 is located in the discharge cell 250, it is possible to reduce external light reflection by increasing the black portion, but lowering the luminance by lowering the aperture ratio, and when the bus electrode 140 is located on the partition wall 240, Due to the application of the complementary color relationship between the partition wall 240 and the front dielectric layer 150, the effect of black fraction cannot be expected. However, the reflection of external light due to the complementary color relationship is reduced by placing the bus electrode 140 on the non-discharge cell 270. It is possible to simultaneously reduce the reflection of external light by the black fraction and increase the bright room contrast more effectively.

On the other hand, the transparent electrode 130 may be made of a transparent material such as indium tin oxide (ITO), and by forming a concave portion in the middle portion of the X, Y transparent electrode 130 facing each other to have a long gap and a short gap discharge The efficiency can be improved.

According to the present invention, by reducing the external light reflection without lowering the aperture ratio, a bus electrode capable of increasing the black portion in the panel having the complementary color relationship between the front dielectric layer and the partition wall and the double partition wall can be positioned above the non-discharge cell between the double partition walls. As a result, the brightness and contrast can be improved more effectively.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (7)

A front substrate and a rear substrate spaced apart from each other while facing each other; The space between the front substrate and the rear substrate is limited to a plurality of discharge cells, and the discharge cells are defined in a matrix and formed in a double direction in one direction to define non-discharge cells, and coloring to reduce external light reflection. Partition wall; A plurality of bus electrodes formed on the front substrate to cross the front substrate and pass over the non-discharge cell; A plurality of transparent electrodes electrically connected to the bus electrode and causing discharge in the discharge cell; And And embedding the bus electrodes and the transparent electrodes on the front substrate and including a colored front dielectric layer to reduce external light reflection. The plasma display panel of claim 1, further comprising a rear dielectric layer filling the address electrode on the rear substrate. The plasma display panel of claim 1, further comprising a protective layer on the front dielectric layer. The plasma display panel of claim 1, wherein the bus electrodes include an X bus electrode and a Y bus electrode that extend in parallel to each other. The plasma display panel of claim 1, wherein the transparent electrodes include an X transparent electrode and a Y transparent electrode facing each other to cause a discharge. 6. The plasma display panel of claim 5, wherein at least a portion of each end of the X transparent electrode and the Y transparent electrode facing each other is concave to form a long gap. The plasma display panel of claim 1, wherein an upper surface of the partition wall is colored.

Images