KR100316109B1 - Plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel.

The present invention provides a rear substrate including a plurality of partition walls coated with a fluorescent layer in parallel, and a sustain electrode sealed to an upper side of the rear substrate and having a transparent electrode and a bus electrode for discharging at a predetermined interval and having a predetermined distance therebetween. In the plasma display panel including a front substrate arranged in a row, the bus electrode has an oblique shape in which one side end and the other end is symmetrical from the longitudinal center thereof in order to widen the transmission area of light with respect to the center portion of the transparent electrode. It is provided with.

Therefore, even when the voltage is gradually decreased as the voltage supplied through the bus electrodes arranged on the front substrate is supplied to the other end (or one end), the color purity and luminance of the plasma display panel are not lowered by the dropped voltage.

Description

Plasma display panel {Plasma display panel}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel. More particularly, the present invention relates to a plasma display panel in which a voltage drop occurs in which a voltage supplied through a bus electrode arranged on a front substrate of a plasma display panel drops. The present invention relates to a plasma display panel in which color purity and luminance of a display panel are not deteriorated, thereby maintaining high definition and high image quality.

Recently, the importance of the image display device (or the image display device) has become more important as the development of high-definition television is partially completed and the improvement plan for this is continuously studied. As such a type of image display device, as is known, a color cathode ray tube (CRT), a liquid crystal display (LCD), a fluorescent display (VFD), a plasma display panel (hereinafter referred to as PDP), etc. There is this.

Among the image display apparatuses, the plasma display panel is used to display an image by using a gas discharge phenomenon, has the most promising resolution and roughness ratio in this field, is fast in response, and suitable for displaying a large area image. Widely used in applications such as televisions, monitors, and indoor and outdoor advertising display panels.

1 and 2 illustrate an exploded perspective view showing a state in which a typical plasma display panel is separated and a cross-sectional view showing a combined state.

In other words, the rear substrate shown in FIG. 2 is rotated 90 ° with respect to the front substrate for better understanding.

That is, in the plasma display panel, the front substrate 10, which is the display surface on which an image is displayed, and the rear substrate 20 forming the rear surface are coupled in parallel with a predetermined distance therebetween.

Under the front substrate 10, a sustain electrode 11 for maintaining light emission of a cell by mutual discharge in one pixel, that is, a transparent electrode (or ITO electrode) 11a formed of a transparent ITO material and a metal material The sustain electrodes 11 provided as the manufactured bus electrodes 11b are installed in pairs. The sustain electrode 11 is covered by a dielectric layer 12 that limits a discharge current and insulates electrode pairs, and a protective layer 13 is formed on an upper surface thereof.

In the rear substrate 20, a plurality of discharge spaces, that is, stripe-type barrier ribs 21 for forming a cell, are arranged in parallel with each other, and an address discharge is performed at a portion that intersects with the sustain electrode 11 to perform vacuum ultraviolet rays. A plurality of address electrodes 22 are generated in parallel to the partition wall 21.

In addition, an upper surface of the rear substrate is coated with an R.G.B fluorescent layer 23 that emits visible light for image display during address discharge in a state in which only the top surface of the barrier 21 is removed.

The image display process of the cells in the PDP according to the prior art configured as described above is roughly described as follows.

First, when a voltage of 150 V to 300 V is supplied to the sustain electrode 11 and the address electrode 22 in an arbitrary discharge cell, writing is performed inside the cell located between the sustain electrode 11 and the address electrode 22. The discharge occurs to form wall charges on the inner surface of the discharge space.

After that, when the sustain discharge voltage is supplied to the sustain electrode 11, the sustain discharge occurs easily due to the wall charges formed during the address discharge between the address electrode 22 and the sustain electrode 11, and thus the light emission of the cell in which the write discharge occurs is fixed. Is maintained.

That is, an electric field is generated inside the cell by the discharge between the electrodes, and the trace electrons in the discharge gas are accelerated. Neutral particles are ionized into electrons and ions at a rapid rate due to other collisions, and the discharge gas becomes a plasma state and vacuum ultraviolet rays are generated.

When the generated ultraviolet rays excite the fluorescent layer 23 to generate visible light, and the generated visible light is emitted to the outside through the front substrate 10, external light emission, that is, image display may be recognized. Will be.

After that, when a discharge voltage of 150 V or more is supplied to the sustain electrode 11, a sustain discharge occurs between the sustain electrodes 11 in the discharge cell, so that light emission of the cell is maintained for a predetermined time.

However, the following problems occur in the sustain electrode of the plasma display panel as described above.

That is, as described above, the sustain electrode 11 provided as the transparent electrode 11a and the bus electrode 11b is installed while maintaining a predetermined distance over the entire length of the front substrate 10 in the longitudinal direction and over the full width. As the voltage supplied through the bus electrode 11b of the stage (or the other end) is supplied to the other side (or one end), a voltage drop phenomenon occurs in which the voltage drops gradually.

That is, since voltage is alternately supplied to both ends of the front substrate 10, which is the side to which the voltage is supplied, the highest voltage is supplied to the portion of the front substrate 10, and the luminance is high while the lowest voltage is supplied to the center portion in the longitudinal direction of the front substrate 10. Therefore, there was a problem that the brightness is lowered.

Therefore, there is a problem of degrading the uniform color purity and luminance of the plasma display panel, and thus, the product is directed to high definition and high quality, which are prior tasks to be pursued and solved by the product.

Accordingly, a technical problem to be solved by the present invention, that is, an object of the present invention is created to solve the problem of the sustain electrode of the conventional plasma display panel, the voltage supplied through the bus electrode arranged on the front substrate Even if a voltage drop occurs in which the voltage drops gradually as it is supplied to the other end (or one end), the color purity and luminance of the plasma display panel are not degraded by the dropped voltage, thereby maintaining high definition and high image quality. It is to provide a plasma display panel.

1 is an exploded perspective view for showing a general plasma display panel to which the present invention is applied.

2 is a cross-sectional view showing a coupling state of FIG.

3 is a plan view showing a state in which a sustain electrode is installed on a front substrate of a typical plasma display panel.

Figure 4 is a plan view showing a state in which the sustain electrode of the first embodiment is installed on the front substrate to which the present invention is applied.

5 is a plan view showing a state in which the sustain electrode of the second embodiment is installed on the front substrate to which the present invention is applied.

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

10,20; front and rear substrate 11; holding electrode

11a; transparent electrode 11b; bus electrode

12; dielectric layer 13; protective layer

21; partition 22; address electrode

23; fluorescent layer

In order to achieve the above object, a first embodiment of the present invention includes a rear substrate having a plurality of partition walls coated with a fluorescent layer in parallel, a transparent electrode and a bus sealed with respect to an upper side of the rear substrate. A plasma display panel comprising a front substrate arranged in a longitudinal direction with a sustain electrode having electrodes at predetermined intervals, wherein the bus electrode has one side end and the other end of the light transmitting area with respect to the center of the transparent electrode. The present invention provides a plasma display panel which is provided in an oblique diagonal shape symmetrically with respect to its longitudinal center in order to widen.

Preferably, the length (a) between one side end and the other end of the bus electrode according to the present invention and the inner end of the transparent electrode is the length (b) between the center inner end of the bus electrode and the center inner end of the transparent electrode. It is preferable to provide shorter than).

In addition, according to the second embodiment of the present invention, a rear substrate provided with a plurality of partition walls coated with a fluorescent layer in parallel, and a sustain electrode sealed with respect to an upper side of the rear substrate and having a transparent electrode and a bus electrode for discharge are predetermined. 13. A plasma display panel comprising a front substrate arranged in a longitudinal direction with a spacing therebetween, wherein the transparent electrodes with the bus electrodes arranged in parallel are symmetrical toward the longitudinal center to widen the transmission area of light with respect to the central portion thereof. It provides a plasma display panel, characterized in that installed in the diagonal direction.

Preferably, the length (a) of one side end and the other end of the transparent electrode is preferably provided shorter than the central length (b) of the transparent electrode.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention for achieving the above object will be described in detail.

In other words, for convenience of description, the same parts and members as in the prior art will be described with the same reference numerals as in the prior art.

1 is an exploded perspective view of a general plasma display panel to which the present invention is applied, and FIGS. 4 to 5 are plan views showing the first and second embodiments according to the present invention.

As shown in the drawing, the plasma display panel to which the present invention is applied has front and rear substrates 10 and 20 coupled in parallel with a constant interval therebetween.

Below the front substrate 10, a sustain electrode 11 provided as a transparent electrode 11a and a bus electrode 11b for maintaining light emission of a cell is arranged.

The sustain electrode 11 is covered by the dielectrically formed dielectric layer 12 and the protective layer 13, and the rear substrate 20 is installed below (or behind) the structure, which is generally described above in the related art. It is similar to the structure of the plasma display panel.

However, the dominant feature of the first embodiment according to the present invention is that the bus electrode 11b has its one end and the other end thereof extended in its longitudinal center to widen the light transmission area with respect to the center of the transparent electrode 11a. It is provided in a diagonal shape symmetrically from the starting point.

That is, the length a between the one end and the other end of the bus electrode 11b according to the first embodiment of the present invention and the inner end of the transparent electrode 11a is equal to the inner end of the center of the bus electrode 11b. It should be provided shorter than the length (b) between the inner end of the central portion of the transparent electrode (11a).

In addition, the feature of the second embodiment according to the present invention is that the transparent electrode 11a, in which the bus electrode 11b is disposed in parallel, has a diagonal direction symmetrical toward the longitudinal center in order to widen the transmission area of light with respect to the central portion thereof. Is installed.

Preferably, the length (a) of one end and the other end of the transparent electrode (11a) should be shorter than the central length (b) of the transparent electrode (11a).

The operation of the present invention configured as described above will be described.

First, when a voltage of 150 V to 300 V is supplied to the sustain electrode 11 and the address electrode 22 in an arbitrary discharge cell, writing is performed inside the cell located between the sustain electrode 11 and the address electrode 22. The discharge occurs to form wall charges on the inner surface of the discharge space.

After that, when the sustain discharge voltage is supplied to the sustain electrode 11, the sustain discharge occurs easily due to the wall charges formed during the address discharge between the address electrode 22 and the sustain electrode 11, and thus the light emission of the cell in which the write discharge occurs is fixed. Is maintained.

That is, an electric field is generated inside the cell by the discharge between the electrodes, and the trace electrons in the discharge gas are accelerated. Neutral particles are ionized into electrons and ions at a rapid rate due to other collisions, and the discharge gas becomes a plasma state and vacuum ultraviolet rays are generated.

When the generated ultraviolet rays excite the fluorescent layer 23 to generate visible light, and the generated visible light is emitted to the outside through the front substrate 10, external light emission, that is, image display may be recognized. Will be.

After that, when a discharge voltage of 150 V or more is supplied to the sustain electrode 11, a sustain discharge occurs between the sustain electrodes 11 in the corresponding discharge cell, and the light emission of the cell is maintained for a predetermined time. Same operation.

In addition, as described above, when the general plasma display panel is operated, the voltage decreases gradually as the voltage supplied through the bus electrode 11b at one end (or the other end) is supplied to the other end (or the one end). Voltage drop occurs, and thus, both ends of the front substrate 10, which is the side where the voltage is supplied, are supplied with the highest voltage, so that the luminance is high, while the center portion in the longitudinal direction of the front substrate 10 has the lowest voltage. The brightness is lowered, which is also pointed out as the same problem as the conventional problem.

However, at this time, the feature of the present invention, the bus electrode (11b) as shown in Figures 4 to 5 to widen the transmission area through which light is transmitted to the central portion of the transparent electrode (11a) that the voltage is most reduced to decrease the brightness and color purity It is possible to reduce the luminance and color purity attenuated by the voltage drop by widening the diagonally symmetrically or diagonally extending or extending the central portion of the transparent electrode 11a outward to widen the transmission area through which light is transmitted. Is to compensate.

More specifically, the shape of the bus electrode 11b and the transparent electrode 11b is deformed in the center portion of the front substrate 10 where the voltage supplied through the bus electrode 11b is the lowest and the brightness decreases, and accordingly the front surface is deformed. By widening the transmission area through which light is transmitted in the central portion of the substrate 10, the conventional problems of color purity degradation and luminance that have occurred in the central portion are solved.

Therefore, the color purity and luminance of the plasma display panel are kept uniform.

As described in detail above, according to the present invention, voltage drop gradually decreases as the voltage supplied through the bus electrodes arranged on the front substrate of the plasma display panel is supplied to the other end (or one end). Even if this occurs, the color purity and luminance of the plasma display panel are not lowered by the dropped voltage, thereby maintaining high definition and high image quality.

Until now illustrated and described with respect to the preferred embodiment according to the present invention, but not limited to this can be variously changed and used by those skilled in the art.

However, it is apparent that such modifications fall within the scope of the present invention.

Claims (4)

A rear substrate having a plurality of partition walls coated with a fluorescent layer in parallel, and a sustain electrode sealed to an upper side of the rear substrate and having a transparent electrode and a bus electrode for discharging at predetermined intervals are arranged in the longitudinal direction. A plasma display panel comprising a front substrate, The bus electrode is characterized in that the one end and the other end is provided in a diagonal shape symmetrical from the center in the longitudinal direction in order to widen the transmission area of light with respect to the central portion of the transparent electrode. The length (a) between one side end and the other end of the bus electrode and the inner end of the transparent electrode is a length (b) between the center inner end of the bus electrode and the center inner end of the transparent electrode. Plasma display panel, characterized in that provided shorter. A rear substrate having a plurality of partition walls coated with a fluorescent layer in parallel, and a sustain electrode sealed to an upper side of the rear substrate and having a transparent electrode and a bus electrode for discharging at predetermined intervals are arranged in the longitudinal direction. A plasma display panel comprising a front substrate, And the transparent electrodes, in which the bus electrodes are arranged in parallel, are installed in a diagonal direction symmetrically toward the center in the longitudinal direction in order to widen the transmissive area of light with respect to the center portion thereof. 4. The plasma display panel of claim 3, wherein the length (a) of one end and the other end of the transparent electrode is shorter than the length (b) of the center of the transparent electrode.