KR100533417B1 - Plasma Display Panel - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode structure of a plasma display panel, and more particularly to a bus electrode structure for improving brightness, efficiency, and discharge stability by changing the position of a bus electrode on a front substrate. To this end, the present invention is the front substrate electrode structure of the plasma display panel having a transparent electrode formed on the front substrate and the bus electrode formed on the transparent electrode, characterized in that the bus electrode is located in a predetermined distance range from the discharge region. It is done.

According to an aspect of the present invention, the distance from the center between the pair of discharge sustain electrodes to the center of the bus electrode is d, and the distance between both ends of the pair of discharge sustain electrodes is h. d is positioned to satisfy h / 8 <d <h / 4.

Description

Plasma Display Panel

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface discharge AC plasma display panel (hereinafter referred to as a plasma display panel), and more particularly, to an electrode structure of a PDP for improving luminance, efficiency, and discharge stability by changing a position of a bus electrode of a front substrate. It is about.

The PDP is a display device that displays characters or graphics by using light emitted from plasma generated during gas discharge. PDP is currently being actively researched, liquid crystal display (LCD), field emission display (FED), and electroluminesc (ELD).

Among flat panel displays in various fields such as -ence display, it has the most suitable advantage for large size.

PDP can be enlarged to 40 ″ or more, and CRT level colorization is possible because of the use of photoluminescence mechanism that emits visible light by stimulating the fluorescent film with ultraviolet rays formed in the discharge. As a self-emissive display, it has many unique advantages not found in other flat devices such as a wide viewing angle of more than 160 °. It is a large display device for multimedia that combines the functions of next-generation high-definition wall TV, TV, and PC. Recently, interest in this has been increasing.

PDP adopts a method of applying a suitable electrode and phosphor on each substrate using two glass substrates having a thickness of about 3 mm, and forming a plasma in the space therebetween while maintaining an interval of about 0.1 mm to 0.2 mm. As a result, it can be enlarged as a flat plate. In addition, in the PDP, the gas discharge has a strong nonlinearity in which discharge does not occur even when a voltage is applied between electrodes, and a super large panel having a memory function which is an essential function for driving a large display. Even in this case, a high quality image can be expressed without deteriorating the luminance.

PDP is a direct current (DC type) in which the electrode for generating plasma is directly exposed to the plasma so that the conduction current flows directly through the electrode, and the electrode is covered with a dielectric material so that the displacement current is not directly exposed. It is divided into alternating current type (AC type).

Each of the DC Plasma Display Panel (hereinafter referred to as DC PDP) and AC Plasma Display Panel (hereinafter referred to as AC PDP) consists of a front substrate, a back substrate, and two glass substrates. A cathode is formed on the front substrate of the DC PDP, and an anode, a phosphor, a resistor, and a partition wall are formed on the rear substrate, a discharge sustaining electrode, a bus electrode, a dielectric layer, and a protective layer are formed on the front substrate of the AC PDP, and an address is formed on the rear substrate. Electrodes, dielectric layers, barrier ribs, and fluorescent layers are formed.

Hereinafter, a conventional surface discharge AC PDP and a driving method thereof will be described with reference to the drawings. 1 is a block diagram showing the structure of a conventional AC PDP.

The AC PDP shown in FIG. 1 includes, for example, a front substrate 122 and a back substrate 124 made of transparent glass facing each other in parallel with an interval of 100 to 200 μm. The discharge space 128 is defined by the partition walls 126 and 126 which are parallel to each other on the front substrate 122 and the rear substrate 124.

The front substrate 122 becomes a display surface, and a plurality of row electrodes Xi, Yi (i = 1, 2, ..., n) are formed on the surface of the front substrate 122 that faces the rear substrate 124. It is formed as a sustain electrode. The sustain electrodes extend in parallel to each other at a thickness of approximately several hundred nm by, for example, evaporation of ITO, tin oxide (SnO), or the like. In each row electrode Xi and Yi, metal bus electrodes alpha i and beta i narrower than the widths of the row electrodes Xi and Yi are formed in close contact with the row electrodes Xi and Yi. These bus electrodes alpha i and beta i are for increasing the conductivity of the row electrodes Xi and Yi as auxiliary electrodes. In addition, two row electrodes Xi and Yi adjacent to each other form a pair to form a row electrode pair Xi and Yi. Next, the dielectric layer 130 is formed to a thickness of about 20-30 μm so as to cover the row electrodes Xi and Yi. In contact with the dielectric layer 130, an MgO layer 132 made of magnesium oxide (MgO) is laminated to a thickness of approximately several hundred nm.

On the other hand, in the back substrate 124, the partition wall 126 is formed in order to maintain the space | interval with the front substrate 122. FIG. The partition walls 126 are formed in parallel with each other such that the longitudinal direction extends in a direction orthogonal to the row electrodes Xi and Yi, for example, 50 μm wide, and 400 μm apart, for example, using a thick film printing technique. In addition, the space | interval of the partition 126 is not restricted to 400 micrometers, but can be changed to an appropriate value according to the size of the PDP used as a display surface, and the number of pixels.

In addition, column electrodes Dj (j = 1, 2, ..., m) made of, for example, aluminum (Al) or an aluminum alloy are formed between the adjacent partition walls 126 and 126 as address electrodes. . The column electrodes Dj are formed to have a thickness of approximately 100 nm in a direction orthogonal to the longitudinal directions of the row electrodes Xi and Yi. The column electrode Dj is not limited to Al and Al alloys, but can be made of a suitable metal or alloy such as Cu and Au having high reflectance.

In addition, while covering each column electrode Dj, the phosphor film 136 is formed as a light emitting layer with a thickness of 10-30 micrometers, for example. Each of the electrodes Xi, Yi, Dj, the front substrate 122 and the back substrate 124 on which the dielectric layer 130 and the light emitting layer 136 are formed is sealed, the discharge space 128 is exhausted, and then the MgO layer by baking. Moisture on the surface of 132 is removed. Subsequently, 400-600 torr of inert mixed gas containing 3 to 7% of Ne and Xe gas is injected into the discharge space 128, for example.

By doing in this way, the unit light emitting area centered on the intersection of the paired row electrodes Xi, Yi and the column electrodes Dj intersecting these row electrodes is defined as one pixel cell Pi, j. The pixel cells Pi and j emit phosphors by being excited by discharges between the electrodes Xi, Yi and Dj. That is, in each pixel cell Pi, j, light emission is controlled by selecting, holding and erasing the light emission discharge of pixel cell Pi, j by application of the voltage between electrodes Xi, Yi, Dj.

FIG. 2 is a cross-sectional view of the front substrate of the conventional PDP shown in FIG. 1. As shown in FIG. 2, a discharge region is formed in a space between two transparent electrodes Xi and Yi.

As shown in Fig. 2, in the conventional PDP, the bus electrodes are positioned outward from the center on the transparent electrodes Xi and Yi around the discharge region. In the case of such a conventional AC PDP, the efficiency is approximately 1 to 1-. It is 1.5 [lm / W], and in some test models, the efficiency is about 2.5 [lm / W].

Various attempts have been made to improve the efficiency of AC PDP. Among these, the most widely studied approach focuses on the composition ratio of discharge gas used rather than structural improvement. That is, by increasing the content of Xe in the discharge gas (for example, by increasing the content to 10% to 20%), the effect of improving the efficiency to some extent was seen.

However, the increase of the Xe content has the side effect of raising the discharge start voltage and the discharge sustain voltage between the front substrate electrode. In addition, as the Xe content increases, the discharge instability increases, such as an increase in the discharge delay time.

However, there is one disclosed in Korean Patent Laid-Open Publication No. 10-2001-0026986 published on April 6, 2001, in which the position of the bus electrode of the front substrate is improved to improve the wall charge effect. As disclosed in Korean Patent Application Laid-Open No. 10-2001-0026986, it is described that the wall charge effect can be varied by placing the bus electrodes as shown in FIGS. 3 and 4.

However, Korean Laid-Open Patent Publication No. 10-2001-0026986 does not intend to solve the problem of a technique of improving efficiency by increasing the Xe content proposed in the prior art, and merely locates the bus electrode to obtain a different wall charge effect. It only suggests that you can change. Therefore, even with the matters disclosed in Korean Patent Laid-Open No. 10-2001-0026986, the problems of the prior art could not be solved.

In addition, Korean Patent Publication No. 10-2001-0026986 discloses no quantitative reference to the specific arrangement position of the bus electrode. As a result, even if the Korean Patent Application Publication No. 10-2001-0026986 No. It is too obvious that the problem of increasing the Xe content to improve the conventional efficiency is not easily solved.

An object of the present invention is to solve the conventional problems as described above, to provide an electrode structure of the PDP that can increase the brightness, efficiency without increasing the content of the use gas Xe.

It is still another object of the present invention to provide an electrode structure of a PDP capable of reducing power consumption by reducing the discharge start voltage and the discharge sustain voltage of the PDP.

It is still another object of the present invention to provide an electrode structure of a PDP capable of improving the discharge stability by reducing the discharge delay time of the PDP.

In order to achieve the object of the present invention, the present invention includes a front substrate and a rear substrate facing each other, a pair of discharge sustaining electrode formed on the opposite surface of the front substrate, a bus electrode formed on each of the discharge sustaining electrode, the A dielectric layer covering a discharge sustain electrode and a bus electrode, a protective film coated on the dielectric layer, an address electrode formed on an opposite surface of the rear substrate, a dielectric layer covering the address electrode, a partition formed on the dielectric layer, and a region partitioned by the partition wall. In the plasma display panel including the applied fluorescent layer, the position of the bus electrode on the discharge sustaining electrode is d, the pair of distances from the center between the pair of discharge sustaining electrodes to the center of the bus electrode; When the distance between both ends of the discharge sustaining electrode of h is h, the distance d is equal to h / 8 <d <h / 4. It is characterized by being satisfied.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

First we define a variable that will be used herein to describe the relative position of the bus electrode relative to the transparent electrode. FIG. 5 is a plan view illustrating a front substrate electrode structure of a surface discharge type PDP for explaining definition of a variable to be used in the present specification.

In the following description, h is defined as the distance between both ends of two adjacent transparent electrode pairs. The distance from the center of the discharge area to the center of the bus electrode is defined as d. In addition, as shown in FIG. 5, the area | region partitioned by a pair of discharge sustaining electrode and the partition which is not shown is called one cell. The area where discharge occurs by a pair of discharge sustaining electrodes inside the cell is called a discharge space.

6 is a plan view illustrating a front substrate electrode structure of a surface discharge plasma display panel according to an embodiment of the present invention.

As shown in FIG. 6, in the PDP according to the embodiment of the present invention, in the surface discharge type PDP structure, the position of the bus electrode 620 located on the transparent electrode 610 of the front substrate is centered when viewed from the front surface. It is located outward by a distance less than h / 4 from.

That is, according to an embodiment of the present invention, when the center of the discharge region is located at the center of the cell when the length of the cell is h as viewed from the front surface of the PDP, from the center of the discharge region to the center of the bus electrode 620 The distance d of satisfies the following condition.

Equation 1 d <h / 4

That is, the distance d from the center of the discharge region to the center of the bus electrode 620 should be smaller than h / 4, which is the distance from the center of the discharge region.

According to the above embodiment, the bus electrode 620 present in the proposed position strengthens the electric field in the center of the cell where the discharge starts. The enhanced electric field increases the brightness and decreases the discharge delay time and the discharge start voltage. Thus, ultimately, the efficiency is improved. 7 illustrates a case where the position of the bus electrode in the prior art is h / 4 <d (hereinafter, referred to as a conventional case) and when h / 8 <d <h / 4 (hereinafter, referred to as the present invention). It is a graph comparing efficiency. It can be seen that the present invention improves the efficiency by 40% -50% compared to the prior art.

According to another embodiment of the present invention, the distance d from the center of the discharge region to the center of the bus electrode 620 further satisfies the following condition together with the condition of Equation 1 above.

2 h / 8 <d

That is, the distance d from the center of the discharge region to the center of the bus electrode 620 should be larger than h / 8, which is the distance from the center of the discharge region.

According to the above embodiment, the case of h / 8 <d <h / 4 shows a higher efficiency since the visible light blocking by the bus electrode is smaller than that of d <h / 8, whereas the difference in discharge delay time is different. There will be no. 8 shows the efficiency of the case where the position of the bus electrode is d <h / 8 (hereinafter referred to as (a)) and when h / 8 <d <h / 4 (hereinafter referred to as (b)). Is a graph. It can be seen that the case of (b) shows higher efficiency than the case of (a). 9 shows the discharge delay time when the positions of the bus electrodes are (A) and (B). For each case, the discharge delay time shows no significant difference.

As a result, preferably, the distance d from the center of the discharge region to the bus electrode satisfies the following condition.

Expression 3 h / 8 <d <h / 4

Therefore, when the bus electrode is positioned so as to satisfy h / 8 < h < h / 4, which is the case of (b), luminance, efficiency and discharge stability can be improved as compared with the conventional case.

According to the present invention, by placing the bus electrode close to the discharge region, the brightness can be increased by the enhanced electric field, and the power consumption can be increased by reducing the power discharge voltage and the discharge sustain voltage of the PDP, thereby increasing the efficiency of the PDP. In addition, it is possible to improve the discharge stability by reducing the discharge delay time of the PDP.

1 is a perspective view showing an electrode structure of a typical plasma display.

Figure 2 is a cross-sectional view showing the position of a conventional conventional front substrate bus electrode.

Figure 3 is a cross-sectional view showing the position of the improved front substrate bus electrode.

Figure 4 is another cross-sectional view showing the position of the improved conventional front substrate bus electrode.

5 is a front substrate plan view for the definition of variables to be used herein.

6 is a plan view showing a modified front substrate electrode position of the present invention.

7 is a graph comparing the efficiency of the electrode structure and the conventional electrode structure of the present invention.

8 is a graph comparing the efficiency according to the position of the modified bus electrode.

9 is a table comparing the discharge delay time according to the position of the modified bus electrode.

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

120: plasma display panel 122: front substrate

124: back substrate 126: partition wall

128: discharge space 130: dielectric layer

132: magnesium oxide layer 136: phosphor layer

510: transparent electrode 520: bus electrode

610: transparent electrode 620: bus electrode

Claims (2)

A pair of discharge sustaining electrodes formed on opposite surfaces of said front substrate, bus electrodes formed on each of said discharge sustaining electrodes, dielectric layers covering said discharge sustaining electrodes and bus electrodes, said dielectric material A plasma display panel comprising a protective film coated on a layer, an address electrode formed on an opposite surface of the rear substrate, a dielectric layer covering the address electrode, a partition formed on the dielectric layer, and a fluorescent layer applied in a region partitioned by the partition wall. , The position of the bus electrode on the discharge sustaining electrode is a distance from the center of the discharge region between the pair of discharge sustaining electrodes to the center of the bus electrode d, and the distance between both ends of the pair of discharge sustaining electrodes. When h is h / 8 <d <h / 4 Plasma display panel that satisfies. delete