KR20000060506A - Plasma display panel using high frequency - Google Patents

Abstract

PURPOSE: A plasma display panel using a high frequency is provided to reduce a discharge power by reducing a discharge area, and enhance a light emitting efficiency by limiting a light emitting area to an orthogonal area. CONSTITUTION: A plasma display panel using a high frequency discharge includes first and second electrodes which are faced to each other, are right-angled positioned therebetween, and generates a high frequency discharge. A third electrode generates address discharge, and one between the first and second electrodes. A high frequency signal is provided to the first electrode. Either one of the first electrode and the second electrode and the third electrode are further included in the plasma display panel. A first substrate has a first electrode. A second substrate has the second and third electrodes. A barrier(44) is formed between the first and second substrates, and has a discharge space therein. Thereby, the plasma display panel using a high frequency reduces a discharge power by reducing a discharge area, and enhances a light emitting efficiency by limiting a light emitting area to an orthogonal area.

Description

Plasma Display Panel Using High Frequency

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display apparatus, and more particularly, to a plasma display panel having a structure capable of reducing a discharge power of a plasma display panel using high frequency.

Recently, research on plasma display panels (hereinafter referred to as PDPs), which are easy to manufacture panels as large-area flat panel displays, has been actively conducted according to the needs of large flat panel displays. The PDP generally uses a gas discharge phenomenon to display an image using visible light generated by vacuum ultraviolet rays generated during gas discharge to emit phosphors.

Referring to FIG. 1, a PDP structure of a three-electrode alternating current (AC) surface discharge method that is commonly used is illustrated.

The PDP shown in FIG. 1 includes a top plate composed of sustain electrode pairs 12 and 14, a dielectric layer 16, and a protective film 18 that are sequentially formed on the upper substrate 10, and the lower substrate 20. As shown in FIG. The lower plate which comprises the formed address electrode 22, the partition 24, and the phosphor layer 26 is provided. The upper substrate 10, which is the display surface of the image, is spaced apart in parallel by the partition wall 24. The PDP of FIG. 1 corresponds to one pixel cell, and one pixel cell includes three subcells for emitting visible light of red, green, and blue, respectively. Hereinafter, each of the subcells will be referred to as a discharge cell. On the upper substrate 10, a pair of sustain electrodes, that is, a scan / hold electrode 12 and a sustain electrode 14 are formed side by side, and the pair of sustain electrodes 12, 14 are formed of the transparent electrodes 12A, 14A and the bus electrode ( 12B, 14B). The dielectric layer 16 and the protective layer 18 are sequentially applied on the upper substrate 10 on which the sustain electrode pairs 12 and 14 are formed. The address electrode 22 is formed on the lower substrate 20 in a direction perpendicular to the sustain electrode pairs 12 and 14, and the partition wall 24 is formed parallel to the address electrode 22. On the lower substrate 20 where the barrier rib 24 and the address electrode 22 are formed, a fluorescent layer 26 for emitting visible light of any one of red, green, and blue is sequentially applied. Discharge gas is injected into the discharge space provided between the upper plate and the lower plate by the partition wall 24.

Each of the discharge cells configured in the form of a matrix in the PDP is selected by the address discharge between the address electrode 22 and the scan / hold electrode 12, and then the vacuum generated by the continuous sustain discharge between the sustain electrodes 12 and 14. The ultraviolet light emits the fluorescent material 26 to emit visible light. In this case, the PDP implements a step-by-step brightness (Gray Scale) necessary for displaying an image by adjusting the sustain discharge period, that is, the number of sustain discharges. Accordingly, the number of sustain discharges is an important factor in determining the brightness and discharge efficiency of the PDP. For this sustain discharge, a pulse having a duty ratio of 1, a pulse width of 10 to 20 Hz, and a frequency of usually 200 to 300 kHz is periodically applied to the sustain electrodes 12 and 14. In this case, the sustain discharge occurs only once at an extremely short instant per sustain pulse. The charged particles generated by the sustain discharge move the discharge paths formed between the sustain electrodes according to the polarities of the electrodes, so that wall charges are formed in the discharge space of the cell, and the discharge voltage in the discharge space decreases due to the wall charges. Will stop. As described above, the sustain discharge by the existing sustain pulse is generated only once at a short time per pulse, and most of the other time is consumed in the preparation of the wall charge and the next discharge, so that the discharge efficiency of the PDP is inevitably low.

Recently, in order to solve the low discharge efficiency problem of the PDP, a method of using a high frequency discharge using a high frequency signal as a display discharge has emerged. High frequency discharges are usually generated by high frequency signals in the range of tens of MHz to hundreds of MHz. The vibrating electric field causes electrons to vibrate and continuously ionize, excite and transition the discharge gas. Can cause a discharge. The high frequency discharge has a physical effect such as a positive column having a very high discharge efficiency when the distance between the electrodes is long in the glow discharge. Accordingly, there is an advantage that can significantly improve the discharge efficiency of the PDP when using a high frequency discharge.

2 and 3, a perspective view and a cross-sectional view of a PDP using a high frequency is shown.

2 and 3, the PDP using high frequency includes a high frequency electrode 32 formed on the upper substrate 30, an address electrode 36 and a scanning electrode 40 disposed on the lower substrate 34. The upper substrate 30 and the lower substrate 34 are spaced apart in parallel by the partition 44, and the upper substrate 30 is provided with a high frequency electrode 32 to which a high frequency voltage is applied. The first dielectric layer 48 is coated on the upper substrate 30 on which the high frequency electrode 32 is formed. The address electrode 36 and the scan electrode 40 are formed on the lower substrate 34 in a direction crossing each other. Here, the scan electrode 40 is formed in parallel with the high frequency electrode 32. A second dielectric layer 38 is formed between the address electrode 36 and the scan electrode 40, and the third dielectric layer 44 and the passivation layer 50 are sequentially formed on the second dielectric layer 38 having the scan electrode 40 formed thereon. Is formed. A partition wall 44 is formed on the passivation layer 50, and a phosphor layer 46 is coated on the surface of the partition wall 44. In this case, the partition wall 44 is set higher because the distance between the two electrodes, that is, the high frequency electrode 32 and the scan electrode 40 must be sufficiently secured for the high frequency discharge. Accordingly, in order to prevent crosstalk between the discharge cells, the partition walls 44 are formed in a lattice form to separate discharge spaces in units of discharge cells. Then, the discharge gas is filled in the discharge space therein.

Each discharge cell having a matrix form in the PDP generates an address discharge when a data signal is supplied to the address electrode 36 and a scan signal is supplied to the scan electrode 40. All particles are vibrated in a state in which ions do not move between the high frequency electrode 32 and the scan electrode 40 and only electrons are not attracted to the two electrodes 32 and 40 by the high frequency voltage supplied to the high frequency electrode 32. Will be In this way, the vibrating electrons ionize and excite the discharge gas continuously and emit visible light by emitting vacuum ultraviolet rays and emitting phosphors while the excited atoms and molecules transition to the ground state. Such high frequency discharge has a low discharge power and high luminance and high luminous efficiency compared to a direct current or low frequency AC discharge.

FIG. 3 is a plan view illustrating an electrode arrangement structure of the PDP shown in FIG. 2.

In FIG. 3, the high frequency electrode 32 and the scan electrode 40 are arranged side by side, and the address electrode 36 is disposed in the direction crossing the high frequency electrode 32 and the scan electrode 40. In an arbitrary discharge cell 52, an address discharge occurs between the address electrode 36 and the scan electrode 40, and a high frequency discharge is generated by a high frequency signal applied to the high frequency electrode 32. In this case, since the high frequency discharge is generated between the high frequency electrode 32 and the scanning electrode 40 which are arranged side by side, the light emitting area proportional to the area of the opposing electrode is diffused to near the partition 44 of both sides of the discharge cell. It is widely occupied. As described above, as the emission area is widened by the high frequency electrode 32 and the scan electrode 40 arranged side by side, a large amount of discharge power for high frequency discharge is consumed. In addition, when the light emitting area is diffused to the partition wall 44, since unnecessary energy is consumed by the electrons absorbed by the partition wall 44, a large amount of discharge power is consumed to compensate for energy loss in order to maintain high frequency discharge. have. Accordingly, as the discharge power, that is, the discharge current increases, the probability of the de-excitation of the exciton atoms of the discharge gas generating the vacuum ultraviolet rays in the PDP increases due to the collision with the electrons. do.

In addition, when the light emitting area A shown in FIG. 4 is large, the size of the light emitting area A is high and the discharge cell becomes small, so that the discharge power must be increased to produce the same brightness. .

Accordingly, an object of the present invention is to provide a PDP using a high frequency that can reduce the discharge power and increase the luminous efficiency by reducing the light emitting area.

Another object of the present invention is to provide a PDP using high frequency, which is advantageous for high resolution by reducing the light emitting area.

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

2 is a perspective view showing a conventional plasma display panel using a high frequency wave.

3 is a cross-sectional view of the plasma display panel shown in FIG.

4 is a plan view showing an electrode arrangement structure and a discharge area of the plasma display panel shown in FIG. 2;

5 is a perspective view showing a plasma display panel using a high frequency according to an embodiment of the present invention.

FIG. 6 is a sectional view of the plasma display panel shown in FIG. 5; FIG.

FIG. 7 is a plan view showing an electrode arrangement structure and a discharge area of the plasma display panel shown in FIG. 5; FIG.

8 is a perspective view of a plasma display panel using a high frequency according to another embodiment of the present invention.

FIG. 9 is a sectional view of the plasma display panel shown in FIG. 8; FIG.

FIG. 10 is a plan view showing an electrode arrangement structure and a discharge area of the plasma display panel shown in FIG. 8; FIG.

<Simple explanation of symbols for main parts of drawings>

10, 30: upper substrate 12: scanning / holding electrode

12A, 14A: transparent electrode 12B, 14B: bus electrode

14 sustain electrode 16, 38, 42, 48 dielectric layer

18, 48: protective film 20, 34: lower substrate

22, 36, 60: address electrode 24, 44: partition wall

26, 46: phosphor layer 32, 54: high frequency electrode

40, 58: scan electrodes 52, 56, 62: discharge cells

In order to achieve the above object, the PDP using the high frequency according to the present invention is disposed to be perpendicular to each other and is characterized in that it comprises a first and second electrodes for generating a high frequency discharge.

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

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 5 to 10.

5 and 6, a perspective view and a cross-sectional view of a PDP using a high frequency in accordance with an embodiment of the present invention is shown.

5 and 6, the PDP using the high frequency is formed to be perpendicular to the address electrode 36 and the scan electrode 40 formed on the lower substrate 34 and the scan electrode 40 on the upper substrate 30. A high frequency electrode 54 is provided. The upper substrate 30 and the lower substrate 34 are spaced apart in parallel by the partition wall 44, and the high frequency electrode 54 to which a high frequency voltage is applied is formed long in the upper substrate 30. The first dielectric layer 48 is coated on the upper substrate 30 on which the high frequency electrode 54 is formed. The address electrode 36 and the scan electrode 40 are formed on the lower substrate 34 in a direction crossing each other. Here, the scan electrode 40 is formed to be orthogonal to the high frequency electrode 40. A second dielectric layer 38 is formed between the address electrode 36 and the scan electrode 40, and the third dielectric layer 44 and the passivation layer 50 are sequentially formed on the second dielectric layer 38 having the scan electrode 40 formed thereon. Is formed. A partition wall 44 is formed on the passivation layer 50, and a phosphor layer 46 is coated on the surface of the partition wall 44. In this case, the partition wall 44 is set higher because the distance between the two electrodes, that is, the high frequency electrode 54 and the scan electrode 40 must be sufficiently secured for the high frequency discharge. Accordingly, in order to prevent crosstalk between the discharge cells, the partition walls 44 are formed in a lattice form to separate the discharge space into units of discharge cells. Then, the discharge gas is filled in the discharge space therein.

In the case of the PDP having such a structure, when the high frequency electrode 54 formed on the upper substrate 30, which is an image display surface, is formed in parallel with the address electrode 36, the aperture ratio of the discharge cell may be lowered. ) May be formed as a transparent electrode. Further, by forming a bus electrode on the transparent electrode, it is possible to prevent a decrease in conductivity caused by the transparent electrode.

FIG. 7 is a plan view illustrating an electrode arrangement structure of the PDP illustrated in FIG. 5.

In FIG. 7, the high frequency electrode 54 and the scan electrode 40 are arranged to be orthogonal to each other, and the address electrode 36 is disposed to be parallel to the high frequency electrode 54. In an arbitrary discharge cell 56, an address discharge occurs between the address electrode 36 and the scan electrode 40, and between the high frequency electrode 54 and the scan electrode 40 due to a high frequency signal applied to the high frequency electrode 54. When high frequency discharge occurs, the light emitting area B proportional to the area of the opposite electrode is limited to the orthogonal area of the high frequency electrode 54 and the scan electrode 40. As such, the high frequency electrode 54 and the scan electrode 40 generating high frequency discharges are orthogonal to each other, whereby the light emitting area B may be reduced. In addition, since it does not diffuse to the partition 44 of the light emitting area B, the loss of unnecessary energy by the partition 44 can also be prevented. As a result, as the light emitting area B decreases, the discharge power for high frequency discharge can be reduced, so that the light emitting efficiency can be improved.

8 and 9, a perspective view and a cross-sectional view of a PDP using a high frequency according to another embodiment of the present invention is shown.

8 and 9, the PDP using high frequency includes a high frequency electrode 32 formed on the upper substrate 30, a scan electrode 58 and an address electrode 60 disposed on the lower substrate 34. The upper substrate 30 and the lower substrate 34 are spaced apart in parallel by the partition 44, and the upper substrate 30 has a high frequency electrode 32 to which a high frequency voltage is applied in the horizontal direction. The first dielectric layer 48 is coated on the upper substrate 30 on which the high frequency electrode 32 is formed. Scan electrodes 58 and address electrodes 60 are sequentially formed on the lower substrate 34 in directions crossing each other. Here, the address electrode 60 is formed long in the direction orthogonal to the high frequency electrode 32. A second dielectric layer 38 is formed between the scan electrode 58 and the address electrode 60, and the third dielectric layer 44 and the passivation layer 50 are sequentially formed on the second dielectric layer 38 on which the address electrode 60 is formed. Is formed. A lattice partition 44 is formed on the passivation layer 50, and a phosphor layer 46 is coated on the surface of the partition 44. Then, the discharge gas is filled in the discharge space therein.

FIG. 10 is a plan view illustrating an electrode arrangement structure of the PDP shown in FIG. 8.

In FIG. 10, it can be seen that the high frequency electrode 32 and the address electrode 60 are arranged to be orthogonal, and the scan electrode 58 is arranged to be parallel to the high frequency electrode 32. In this case, in an arbitrary discharge cell 52, an address discharge occurs between the scan electrode 58 and the address electrode 60, and the high frequency electrode 32 and the address electrode 60 are caused by a high frequency signal applied to the high frequency electrode 32. A high frequency discharge occurs between). In this case, since the high frequency discharge is generated between the high frequency electrode 32 and the address electrode 60 at right angles to each other, the emission area C proportional to the area of the opposing electrode is the high frequency electrode 32 and the address electrode 60. This orthogonal area is limited and a reduction effect can be obtained. In addition, since the light emitting area C does not diffuse to the partition wall 44, the loss of unnecessary energy caused by the partition wall 44 can also be prevented. As a result, as the light emitting area C decreases, the discharge power for high frequency discharge can be reduced, so that the light emitting efficiency can be improved.

In addition, in order to generate high frequency discharge, the two electrodes are arranged to be orthogonal to limit the light emitting area to the orthogonal area of the two electrodes, which is advantageous for high definition for high resolution. In other words, when the light emitting area A is large, as shown in FIG. 4, when the light emitting area A is large and the discharge cell is small, the discharge power must be increased to give the same brightness, but as shown in FIGS. 7 and 10. If the light emitting area (B, C) is small, even if the discharge cell is small, it is not necessary to increase the discharge power significantly, which is advantageous for high resolution.

As described above, according to the PDP using the high frequency according to the present invention, it is possible to reduce the discharge power and improve the luminous efficiency by arranging two electrodes generating high frequency discharge orthogonally to limit the light emitting area to the orthogonal area. In addition, according to the PDP using the high frequency according to the present invention, it is advantageous to realize high resolution because the discharge power does not need to be greatly increased even when the discharge cell is reduced by reducing the light emitting area.

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 (6)

In a plasma display panel using a high frequency discharge, And a first electrode and a second electrode disposed to face each other at right angles to generate the high frequency discharge. The method of claim 1, And a third electrode configured to generate an address discharge with any one of the first and second electrodes. The method of claim 2, A high frequency signal is supplied to the first electrode, And one of a scan signal and a data signal is supplied to the second electrode, and a ground potential of the high frequency signal is supplied to the second electrode. The method of claim 2, A first substrate on which the first electrode is formed; A second substrate on which the second electrode and the third electrode are formed; And a partition wall formed between the first substrate and the second substrate to provide a discharge space into which the discharge gas is injected. The method of claim 4, wherein A dielectric layer formed between the second electrode and the third electrode; A phosphor layer coated on at least one of the barrier ribs, the first substrate, and the second substrate; And a protective film applied to at least one of the first substrate and the second substrate. The method of claim 2, An electrode formed on a substrate which is a display surface of an image among the first to third electrodes includes a transparent electrode and a bus electrode.