KR20020017334A - Plasma display panel - Google Patents

Abstract

PURPOSE: A plasma display panel is provided to enlarge a deposition area of fluorescent material in an image pixel and extend a discharge path between electrodes by forming an address electrode, separator and fluorescent material in a pectination shape. CONSTITUTION: A PDP comprises a pair of sustain electrodes(13) patterned on an upper glass substrate with a horizontal stripe shape, an address electrode(16) patterned on a lower glass substrate in a pectination shape and a separator(18) formed between the upper and the lower substrates in a pectination shape along to the address electrode. Discharge gas like He+Xe is injected into the discharge space located among the upper and the lower substrates and the separator. A metal bus electrode(13a) is formed on the upper substrate to reduce a voltage drop of the pair of the sustain electrodes and a dielectric substance and a protection film are laminated on the metal bus electrode. A dielectric substance is laminated on the address electrode and the separator(18) is formed in a pectination shape at the lower substrate. A fluorescent material is deposited on the surface of the separator and the dielectric substance. Therefore, the fluorescent material is patterned in a pectination shape along to the separator.

Description

Plasma Display Panel

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 for enhancing brightness and efficiency.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes. Such flat panel displays include liquid crystal displays (LCDs), field emission displays (FEDs), plasma displays (hereinafter referred to as "PDPs"), and plasma address liquid crystal displays. (Plasma Address Liquid Crystal: PALC). Among them, PDP is advantageous to be larger than 40 inches and has a wide viewing angle.

1 and 2, the three-electrode alternating surface discharge PDP includes an upper glass substrate 1 on which a sustain electrode pair 3 is formed, and a lower glass substrate 2 on which an address electrode 6 is formed. On the lower glass substrate 1, a partition 8 is formed vertically with the address electrode 6 interposed therebetween. Discharge gas such as He + Xe is injected into the discharge space provided between the upper glass substrate 1, the lower glass substrate 2, and the partition wall 8. In the upper glass substrate 1, the sustain electrode pairs 3 are patterned with a transparent conductive material that can transmit visible light, for example, indium tin oxide (ITO). The sustain electrode 3 is in contact with the metal bus electrode 3a. The metal bus electrode 3a serves to reduce the voltage drop of the transparent conductive material with high resistivity. The dielectric 4 is entirely formed on the rear surface of the upper glass substrate 1 so that the sustain electrode 3 and the metal bus electrode 3a are covered. The dielectric 4 serves to lower the voltage required for discharge by accumulating wall charges during discharge. On the dielectric 4, a protective film 5 deposited entirely with magnesium oxide (MgO) is formed. The protective film 5 protects the sustain electrode pair 3 and the dielectric 4 from discharge and also increases secondary electron emission efficiency. In the lower glass substrate 2, the dielectric 7 is formed entirely on the lower glass substrate 2 so as to cover the address electrode 6, and the partition 8 is formed thereon. The address electrodes 6 and the partitions 8 are formed in a stripe shape in a direction orthogonal to the sustain electrode pairs 3. Phosphor 9 is applied to partition 8 and dielectric 7.

The sustain electrode pair 3 and the address electrode 6 intersect in a direction orthogonal to each other as shown in FIG. 3, and the discharge space at the intersection thereof is red (R), green (G), and blue (B) according to the phosphor 9. ) Are each sub-pixel cell. The red (R), green (G), and blue (B) sub pixel cells are gathered to form the pixel cells 10 represented by one dotted line.

Such a three-electrode AC surface discharge type PDP displays an image by a so-called ADS (Addressing and Display Seperated) method in which the addressing period and the display period are time-divided. That is, in the addressing period, the address discharge is caused by the voltage difference between the address electrode 6 to which the data voltage is applied and the sustain electrode 3 to which the scan voltage is applied. By this address discharge, a pixel cell to be displayed or a sub pixel cell for displaying each of red (R), green (G), and blue (B) is selected. In the sustain period, sustain discharge occurs in the pixel cell or sub pixel cell selected by the surface discharge between the sustain electrode pairs 3 to which the alternating current sustain voltage is applied. Ultraviolet rays are generated by the plasma discharge, and the ultraviolet rays excite the phosphor 9 to cause the phosphor 9 to generate visible light.

The conventional three-electrode AC surface discharge type PDP has a luminance of about 350 cd / m ² and an efficiency of about 1 lm / W. It is true that the brightness and efficiency of these PDPs are lower than those of CRTs. Accordingly, there is a demand for a method capable of high luminance and low power of the PDP.

Accordingly, an object of the present invention is to provide a PDP capable of increasing brightness and efficiency.

1 is a perspective view showing a conventional three-electrode AC surface discharge plasma display panel.

FIG. 2 is a longitudinal sectional view showing one cell of the plasma display panel shown in FIG.

3 is a plan view of the plasma display shown in FIG.

4 is a plan view of a plasma display panel according to an embodiment of the present invention;

FIG. 5 is a view illustrating the pixel cells shown in FIGS. 3 and 4 in contrast to each other; FIG.

FIG. 6 is a view illustrating the phosphor coating area on the partitions illustrated in FIGS. 3 and 4 in contrast. FIG.

FIG. 7 is a view showing discharge paths between the metal bus electrode pairs shown in FIG. 4; FIG.

<Description of the symbols for the main parts of the drawings>

1: upper glass substrate 2: lower glass substrate

3,13: sustain electrode 3a, 13a: metal bus electrode

4,7 dielectric 5: protective film

6,16: address electrodes 8,18; septum

9,19: phosphor 10,20: pixel cell

In order to achieve the above object, the PDP according to the present invention includes a sustain electrode pair formed in parallel on the upper glass substrate, and an address electrode formed in the shape of a comb on the lower glass substrate so as to be inclined with the sustain electrode pair by a predetermined inclination angle. .

Other objects and advantages of the present invention in addition to the above object will be apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 4 to 7.

Referring to FIG. 4, the PDP according to the present invention has a pair of sustain electrodes 13 patterned on the upper glass substrate in the form of a stripe in the horizontal direction, and patterned on the lower glass substrate in the form of a comb with different inclination directions at the horizontal line period. And the partition 18 formed between the upper glass substrate and the lower glass substrate in the form of a comb along the address electrode 16. Discharge gas such as He + Xe is injected into the discharge space provided between the upper glass substrate, the lower glass substrate, and the partition wall 18. A metal bus electrode 13a is formed on the upper glass substrate to reduce the voltage drop of the sustain electrode pair 13, and a dielectric and a protective film are stacked thereon. In the lower glass substrate, a dielectric is covered on the comb-shaped address electrode 16, and the partition wall 18 is formed on the comb-shape. Phosphors are applied to the surfaces of the comb-shaped partition wall 18 and the lower dielectric. Thus, the phosphor is patterned in the form of combs along the partition wall 18. The inclined direction of the address electrode 16, the partition wall 18, and the phosphor is refracted in the opposite direction every one horizontal line.

The comb-shaped partition wall 18 may be formed by a screen print, a sand blast, an additive method, a photo-sensitive glass (PSG) patterning method, or the like according to a manufacturing method thereof. have. In such a partition manufacturing method, when the screen or mask is patterned in the form of a comb, it may be formed in the form of a comb according to the pattern shape.

Since the lower plate structure of the PDP according to the present invention is substantially the same as that shown in FIG. 1, detailed description thereof will be omitted.

As can be seen in FIG. 5, the pixel cell 20 of the PDP according to the present invention has the same base area as that of the conventional pixel cell 10. However, as shown in FIG. 6, the partition wall 18 having a comb-tooth shape increases the partition area in the pixel cell 20 than the conventional pixel cell 10. Therefore, the effective area of the phosphor in the pixel cell 20 is increased because the area of the phosphor applied in the pixel cell 20 is increased by an increase in the partition area. Since the phosphor coating area is increased, the number of phosphors excited by ultraviolet rays generated during plasma discharge increases, so the amount of visible light generated from the phosphors increases. In other words, as compared with the related art, the luminance generated from the pixel cells 20 having the same area at the same power is increased.

In addition, since the discharge path L between the metal bus electrodes 13a in the pixel cell of the PDP according to the present invention becomes a path inclined at a predetermined inclination angle rather than vertically, the discharge path L becomes longer than the conventional method. Therefore, as the discharge path L becomes longer during plasma discharge, the electron movement distance becomes longer, and thus more discharge gas atoms are excited to increase the ultraviolet emission efficiency. When the ultraviolet emission efficiency is increased, the visible light generated from the phosphors increases.

As described above, the PDP according to the present invention forms the address electrode, the partition wall, and the phosphor in the form of a comb to enlarge the application area of the phosphor in the pixel cell and to extend the discharge path between the electrodes. As a result, the PDP according to the present invention has high luminance and efficiency.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (4)

In a plasma display panel in which a partition wall is formed between an upper glass substrate and a lower glass substrate, and discharges between electrodes formed on the glass substrates. A pair of sustain electrodes formed in parallel on the upper glass substrate; And an address electrode formed in the shape of a comb on the lower glass substrate so as to be inclined with the sustain electrode pair by a predetermined inclination angle. The method of claim 1, And a partition wall disposed between the upper glass substrate and the lower glass substrate and having the same shape as the address electrode with the address electrode therebetween. The method of claim 2, And the address electrode and the partition wall are formed in opposite directions in a horizontal line cycle. The method of claim 2, And a phosphor which is excited by ultraviolet rays to generate visible light on the partition wall.