KR19990054288A - Plasma display panel - Google Patents

Abstract

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 having improved luminous efficiency and luminance of phosphors. Plasma display panel according to the present invention is to manufacture the back and front substrate through an independent process, respectively, the cathode is formed on the back substrate, the anode is formed on the front substrate. In addition, a light emitting reflective fluorescent substance is coated on the partition wall formed on the rear substrate, and a low energy electron collision fluorescent substance is coated on the surface of the anode formed on the front substrate. The plasma display panel of the present invention having such a structure not only emits visible light from the phosphor coated on the partition wall during gas discharge, but also emits visible light from the phosphor coated on the anode surface, thereby improving the luminous efficiency and luminance of the phosphor. Can be improved.

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 having improved luminous efficiency and luminance of phosphors.

Plasma Display Panel (PDP), which is one of the flat panel display devices, is a display device that uses gas discharge, and can be manufactured with a relatively thin thickness. In addition, the present invention has emerged as a next-generation display device because of the advantage of being able to reduce the size and at the same time produce a large display device.

1 is a cross-sectional view showing a direct current type PDP according to the prior art. As shown in the drawing, a PDP includes an electrode having a pair of glass substrates, that is, a back substrate 1 and a front substrate 7 formed on their surfaces, respectively. The arrangement surfaces of the two face each other and at the same time are sealed so that the electrodes are orthogonal, and the positive electrode 2 to which a predetermined voltage is applied is applied on the rear substrate 1 to define an independent discharge cell and adjacent to each other. The partition 3 which prevents crosstalk between discharge cells is formed, and the phosphor 4 is widely applied on the partition surface to realize colorization along the surface. Then, a cathode 6 for causing a discharge is formed on the front substrate 7.

In the above, the phosphor 4 is a photo-luminescence type reflective phosphor, and red, blue, and green phosphors are repeatedly applied to each discharge cell. In the discharge cell defined by the partition wall 3, a discharge gas 5 such as helium (He), neon (Ne), or xenon (Xe) is encapsulated.

In the DC-type PDP having the above structure, gas discharge occurs due to a potential difference between them according to voltages applied to the anode and the cathode, respectively, in which ultraviolet rays having a short wavelength of 200 nm or less generated during gas discharge are applied to the partition walls. By exciting the phosphors, visible light is generated from the excited phosphors to emit predetermined color light for each discharge cell.

However, the PDP according to the related art has a problem of low luminance and luminous efficiency because phosphors are widely applied along partition walls.

In addition, the cathode formed on the front substrate is usually formed of indium tin oxide (ITO) and a transparent metal. Since the transparent electrode has a light transmittance of 90%, visible light generated during gas discharge is transferred to the entire front substrate. Since most of the visible light passes through only the space between the cathode and the partition wall, the display area is reduced.

Accordingly, an object of the present invention is to provide a PDP capable of increasing the display area while improving the luminous efficiency of the phosphor and the luminance of the PDP.

1 is a cross-sectional view of a plasma display panel according to the prior art.

2 is a sectional view of a plasma display panel according to the present invention;

(Explanation of symbols for the main parts of the drawing)

10 back substrate 11: cathode

12: bulkhead 13: light emitting reflective phosphor

15: discharge gas 20: front substrate

21: anode 22: low energy electron collision type phosphor

In order to achieve the above object, the present invention is to manufacture the back and front substrate through an independent process, respectively, to form a cathode on the back substrate, to form an anode on the front substrate. In addition, a light emitting reflective fluorescent substance is applied to the partition surface formed on the rear substrate as in the prior art, and a low energy electron collision fluorescent substance is applied to the surface of the anode formed on the front substrate.

According to the present invention, visible light is obtained from the light emitting reflective phosphor coated on the partition wall during gas discharge, and also visible light is obtained from the low energy electron collision type fluorescent material coated on the anode, thereby improving luminous efficiency and luminance. You can.

Hereinafter, a preferred embodiment of the present invention will be described in more detail with reference to FIG. 2.

FIG. 2 is a cross-sectional view illustrating a PDP according to the present invention. As shown in the drawing, negative electrodes 11 are formed on the back substrate 10 as electrodes for causing a discharge, and between the negative electrodes 11. A partition 12 is formed in the discharge cell to limit unit discharge cells and prevent crosstalk between adjacent discharge cells. The partition surface is coated with a light emitting reflective phosphor 13 as in the prior art, and a front substrate ( An anode 21 is formed on the 20 as an electrode for causing a discharge. The back substrate 10 and the front substrate 20 have electrodes 11 at the same time as the arrangement surfaces of the electrodes 11 and 21 face each other. , 21 are sealed to be orthogonal, and discharge gas 15 such as helium, neon or xenon is enclosed in the discharge cells.

In addition, a low energy electron collision type phosphor 22 is applied to the surface of the anode 21 formed on the front substrate 20 so as to obtain visible light even when the electrons and the phosphor collide with each other.

Looking at the driving of the PDP according to an embodiment of the present invention having the above structure as follows.

When a predetermined voltage is applied to each of the cathode 11 formed on the rear substrate 10 and the anode formed on the front substrate 20 to start discharging due to a potential difference, the discharge gas 15 enclosed in the discharge cell is plasma As it is converted to a state, it generates ultraviolet rays of short wavelength. In this case, the light-emitting reflective phosphor 13 coated on the partition wall is excited by ultraviolet rays to generate visible light, and the visible light passes through the space between the anode 21 and the partition 12 of the front substrate 20. Comes out of the cell.

In addition, an electric field is generated between the anode 21 and the cathode 11 according to the potential difference therebetween. The electrons moved from the cathode 11 to the anode 21 are accelerated by the electric field to the surface of the anode 21. By colliding with the applied low energy electron collision type phosphor 22, the phosphor 22 is excited. As a result, visible light is generated from the excited low-energy electron-impacting phosphor 22, and unlike the light-emitting reflective phosphor 13, the visible light passes through the entire front substrate 20 and comes out of the cell.

Therefore, the PDP according to the present invention improves the luminous efficiency and luminance of the phosphor compared to the conventional, and also increases the display area because visible light generated from the low-energy electron collision type phosphor goes out of the cell through the anode.

As described above, the PDP according to the present invention forms a cathode on the rear substrate, an anode on the front substrate, as well as a light emitting type reflective phosphor on the partition surface as in the prior art, and low energy electrons on the surface of the anode. By applying the impingement phosphor, the luminous efficiency of the phosphor and the brightness of the PDP can be increased, and the visible area generated from the low-energy electron impinging phosphor is also emitted to the outside of the cell through the anode formed on the front substrate. Can be increased.

Meanwhile, although specific embodiments of the present invention have been described and illustrated, modifications and variations can be made by those skilled in the art. Accordingly, the following claims are to be understood as including all modifications and variations as long as they fall within the true spirit and scope of the present invention.

Claims (1)

A stripe-shaped anode is formed on the upper part at equal intervals, and partition walls are formed on the anode to define independent discharge cells and to prevent crosstalk between adjacent discharge cells. The back substrate to which the phosphor is applied, the stripe-shaped cathode are formed on the upper side at equal intervals, and the surface of the cathode is filled in the discharge cell defined by the low energy electron collision type phosphor, and the partition wall. And a discharge gas, wherein the back and front substrates are sealed such that the electrodes are orthogonal to each other at the same time as the arrangement surfaces of the electrodes formed on each of them are facing each other.