KR20030073172A - Plasma display panel - Google Patents

Abstract

PURPOSE: A plasma display panel is provided to achieve improved color purity and color temperature by permitting transparent electrodes to have different areas in each of discharge cells, while reducing an abnormal discharge. CONSTITUTION: A plasma display panel comprises a scan/sustaining electrode(44Y) and a common sustaining electrode(46Z) formed on an upper substrate(32); and an address electrode(50X) formed on a lower substrate(34). The scan/sustaining electrode and the common sustaining electrode have transparent electrodes(44A,46A) and bus electrodes(44B,46B). The transparent electrodes are made of a transparent electrode material having a high light transmittance, and have different areas in each of red, green and blue discharge cells.

Description

Plasma Display Panel

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel capable of improving image quality.

Plasma Display Panel (hereinafter referred to as "PDP") is a display device using visible light generated from a phosphor when ultraviolet light generated by gas discharge excites the phosphor. PDP is thinner and lighter than the cathode ray tube (CRT), which has been the mainstay of the display means, and has the advantage of being able to realize a high definition large screen. PDP is composed of a plurality of discharge cells arranged in a matrix form, one discharge cell constitutes a pixel of the screen.

Referring to FIG. 1, a discharge cell of a conventional three-electrode AC surface discharge type PDP is formed on the upper substrate 2 and the scan / hold electrode 14Y and the common sustain electrode 16Z, and on the lower substrate 4. The formed address electrode 20X is provided. Here, the sustain electrode pairs 14Y and 16Z are composed of the transparent electrodes 14A and 16A and the bus electrodes 14B and 16B.

The upper dielectric layer 12 and the passivation layer 10 are stacked on the upper substrate 16 having the scan / sustain electrode 14Y and the common sustain electrode 16Z side by side. Wall charges generated during plasma discharge are accumulated in the upper dielectric layer 12. The protective film 10 prevents damage to the upper dielectric layer 12 due to sputtering generated during plasma discharge, and increases discharge efficiency of secondary electrons. As the protective film 10, magnesium oxide (MgO) is usually used.

The lower dielectric layer 18 and the partition wall 8 are formed on the lower substrate 4 on which the address electrode 20X is formed, and the phosphor layer 6 is coated on the surfaces of the lower dielectric layer 18 and the partition wall 8. The address electrode 20X is formed in the direction crossing the scan / sustain electrode 14Y and the common sustain electrode 16Z.

The partition 8 is formed in parallel with the address electrode 20X to prevent the ultraviolet rays and the visible light generated by the discharge from leaking to the adjacent discharge cells. The phosphor layer 6 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red (R), green (G), and blue (B). Inert gas for gas discharge is injected into the discharge space provided between the upper substrate 2 / lower substrate 4 and the partition wall 8.

In the discharge cell of this structure, the vacuum ultraviolet rays generated by the sustain discharge between the sustain electrode pairs 14Y and 16Z after being selected by the address discharge between the address electrode 20X and the scan / sustain electrode 14Y are emitted from the phosphor 6 Excitation) to emit visible light causes the PDP to display the desired image.

In the conventional PDP, discharge cells having a constant width are formed with the partition wall 8 interposed therebetween. The discharge cells have different light emission characteristics of the phosphor layers 6 of red (R), green (G), and blue (B), so that the discharge cells can realize red (R), green (G), and blue (B). The luminance is different. In particular, the brightness of the discharge cells implementing green (G) is higher than the brightness of the discharge cells implementing red (R) and blue (B), and the brightness of the discharge cells implementing red (R) is blue (B). It has a higher characteristic than the brightness of the discharge cell to implement. That is, the luminance of the discharge cells implementing red (R), green (G), and blue (B) is 30%: 55%: 15%. In this case, due to the low luminance of the discharge cells implementing the blue (B), the overall color temperature of the discharge cells implementing the red, green, and blue colors is about 5000 to 6000K, which makes it difficult to achieve the white balance. Accordingly, there is a problem that the image quality is lowered.

In addition, undischarged charges are attracted toward the green (G) phosphor having a relatively low dielectric constant among the phosphors of red (R), green (G), and blue (B). There is a problem that an abnormal abnormal discharge occurs by such undischarged charges.

Accordingly, an object of the present invention is to provide a plasma display panel which can improve image quality and reduce abnormal abnormal discharge.

1 is a perspective view showing a surface discharge type plasma display panel of an AC driving method.

FIG. 2 is a plan view of the plasma display panel shown in FIG. 1; FIG.

3 is a perspective view illustrating a plasma display panel according to a first embodiment of the present invention.

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

5 is a plan view illustrating a plasma display panel according to a second exemplary embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

2,32: upper substrate 4,34: lower substrate

6,36 phosphor Phosphor 8,5 partition wall

10,40: protective film 12,18,42,48: dielectric layer

14Y, 44Y: Scanning / holding electrode 6Z, 46Z: Common holding electrode

20X, 50X: Address electrode

In order to achieve the above objects, the plasma display panel according to the present invention includes a sustain electrode pair for sustain discharge on a substrate, and the sustain electrode pair has an area of a transparent electrode corresponding to discharge cells implementing red, green, and blue. It is characterized in that it is formed differently.

The area of the transparent electrode is characterized in that the discharge cells to implement the blue, red, green in order of size.

The transparent electrode area ratios of the discharge cells implementing the blue, red, and green colors are 1.1 to 1.2: 0.9 to 1.1: 0.8 to 0.9.

The plasma display panel further includes a bus electrode formed on the transparent electrode, and the scan / hold electrode and the common sustain electrode are formed of the bus electrode and the transparent electrode.

The plasma display panel may include a dielectric layer formed to cover the upper substrate and the sustain electrode pair, and a protective layer formed to cover the dielectric layer.

The plasma display panel further includes a lower substrate formed to face the upper substrate, an address electrode formed on the lower substrate, and a partition wall formed between the upper substrate and the lower substrate.

The area of the transparent electrode is formed to be different for each discharge cell by removing a portion in a direction orthogonal to the partition wall.

The area of the transparent electrode is formed to be different for each discharge cell by removing a portion in a direction parallel to the partition wall.

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

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 3 to 5.

3 and 4, the plasma display panel according to the present invention is formed on the scan / sustain electrode 44Y and the common sustain electrode 46Z formed on the upper substrate 32, and on the lower substrate 34. Provided address electrode 50X.

The upper dielectric layer 42 and the passivation layer 40 are stacked on the upper substrate 32 on which the scan / sustain electrode 44Y and the common sustain electrode 46Z are arranged side by side. In the upper dielectric layer 42, wall charges generated during plasma discharge are accumulated.

The passivation layer 40 prevents damage to the upper dielectric layer 42 due to sputtering generated during plasma discharge and increases discharge efficiency of secondary electrons. As the protective film 40, magnesium oxide (MgO) is usually used.

The lower dielectric layer 48 and the partition wall 58 are formed on the lower substrate 34 on which the address electrode 50X is formed, and the phosphor layer 56 is coated on the surfaces of the lower dielectric layer 48 and the partition wall 58. The address electrode 50X is formed in the direction crossing the scan / sustain electrode 44Y and the common sustain electrode 46Z.

The partition wall 58 is formed in parallel with the address electrode 50X to prevent ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells.

The phosphor layer 56 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red (R), green (G), and blue (B).

Inert gas for gas discharge is injected into the discharge space provided between the upper substrate 32 / lower substrate 34 and the partition wall 58.

Each of the sustain electrode pairs 44Y and 46Z according to the present invention comprises transparent electrodes 44A and 46A and bus electrodes 44B and 46B.

The bus electrodes 44B and 46B are formed on the transparent electrodes 44A and 46A in the direction crossing the partition walls 56. The bus electrodes 44B and 46B are made of a conductive material, for example, silver (Ag) or copper (Cu) because the transparent electrodes 44A and 46A have a large resistance value and thus do not efficiently transmit power. Compensate for the resistive components of (44A, 46A).

The transparent electrodes 44A and 46A are made of a transparent electrode material (ITO) having a light transmittance of 90% or more, and are formed to have different areas for red (R), green (G), and blue (B) discharge cells. That is, since the areas of the transparent electrodes 44A and 46A are proportional to luminance, the transparent electrodes 44A and 46A are formed in the order of blue (B) discharge cells, red (R) discharge cells, and green (G) discharge cells. Preferably, the transparent electrode area of the red (R) discharge cell: the transparent electrode area of the green (G) discharge cell: the transparent electrode area of the blue (B) discharge cell = 0.9-1.1: 0.8-0.9: 1.1-1.2.

In order to change the area of the transparent electrodes 44A and 46A for each discharge cell, a part of the transparent electrode is removed in a direction parallel to the bus electrodes 44B and 46B for each discharge cell. Accordingly, the distance Db between the transparent electrodes 44A and 46A corresponding to the blue (B) discharge cells is relatively narrower than the distance Dr between the transparent electrodes 44A and 46A corresponding to the red (R) discharge cells. The distance Dr between the transparent electrodes 44A and 46A corresponding to the red (R) discharge cells is relatively narrower than the distance Dg between the transparent electrodes 44A and 46A corresponding to the green (G) discharge cells.

As such, the area of the transparent electrode of the blue (B) discharge cell having a relatively low luminance can be formed to increase the luminance, thereby improving color purity and color temperature. In addition, since the area of the transparent electrode of the green (G) discharge cell having high luminance can be narrowed, the luminance can be relatively lowered, thereby improving white color purity. As a result, the luminance ratio of the red (R), green (G), and blue (B) discharge cells is 25%: 53%: 22% by adjusting the areas of the transparent electrodes 44A, 46A. In this way, by adjusting the luminance ratio, the white color temperature is improved from 5000K to 9000K, thereby increasing the color purity of white and smoothly realizing the screen.

5 is a plan view illustrating a PDP according to a second embodiment of the present invention.

Referring to FIG. 5, the PDP according to the second embodiment of the present invention discharges by removing a portion of the sustain electrodes 44Y and 46Z into an area parallel to the partition wall 58, compared to the PDP shown in FIG. 4. The same components are provided except that the cells are formed differently.

Each of the sustain electrode pairs 44Y and 46Z according to the second embodiment of the present invention includes the transparent electrodes 44A and 46A and the bus electrodes 44B and 46B.

The bus electrodes 44B and 46B are formed on the transparent electrodes 44A and 46A in the direction crossing the partition walls 56. The bus electrodes 44B and 46B are made of a conductive material, for example, silver (Ag) or copper (Cu) because the transparent electrodes 44A and 46A have a large resistance value and thus do not efficiently transmit power. Compensate for the resistive components of (44A, 46A).

The transparent electrodes 44A and 46A are made of a transparent electrode material (ITO) having a light transmittance of 90% or more, and are formed to have different areas for red (R), green (G), and blue (B) discharge cells. That is, since the luminance varies depending on the areas of the transparent electrodes 44A and 46A, the blue (B) discharge cells, the red (R) discharge cells, and the green (G) discharge cells are widely formed in order. Preferably, the transparent electrode area of the red (R) discharge cell: the transparent electrode area of the green (G) discharge cell: the blue (B) discharge cell is the transparent electrode area = 0.9 to 1.1: 0.8 to 0.9: 1.1 to 1.2.

In order to change the areas of the transparent electrodes 44A and 46A for each discharge cell, some of the transparent electrodes 44A and 46A are removed in a direction parallel to the partition wall 58 for each discharge cell. Accordingly, the distance Db between the transparent electrodes 44A and 46A corresponding to the blue (B) discharge cells is relatively narrower than the distance Dr between the transparent electrodes 44A and 46A corresponding to the red (R) discharge cells. The distance Dr between the transparent electrodes 44A and 46A corresponding to the red (R) discharge cells is relatively narrower than the distance Dg between the transparent electrodes 44A and 46A corresponding to the green (G) discharge cells.

As such, the area of the transparent electrode of the blue (B) discharge cell having a relatively low luminance can be formed to increase the luminance, thereby improving color purity and color temperature. In addition, since the area of the transparent electrode of the green (G) discharge cell having high luminance can be narrowed, the luminance can be relatively lowered, thereby improving white color purity. As a result, the luminance ratio of the red (R), green (G), and blue (B) discharge cells is 25%: 53%: 22% by adjusting the area of the transparent electrode. In this way, by adjusting the luminance ratio, the white color temperature is improved from 5000K to 9000K, thereby increasing the color purity of white and smoothly realizing the screen.

As described above, the plasma display panel according to the present invention forms an area of the transparent electrode differently for each discharge cell. That is, the transparent electrode area of the blue discharge cell is formed relatively wide, and the transparent electrode area of the green discharge cell is formed relatively narrow. Accordingly, the luminance of the green discharge cells is lowered, and the luminance of the blue discharge cells is increased, thereby improving color purity and color temperature. Furthermore, the image quality can be improved.

In addition, the space discharge amount of the green discharge cell having the smallest area of the transparent electrode is relatively reduced. As a result, the amount of charges due to undischarged decreases, so that abnormal discharge can be reduced.

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 (8)

A sustain electrode pair for sustain discharge on the substrate, The sustain electrode pairs of the plasma display panel, characterized in that the area of the discharge cells and the transparent electrode corresponding to the red, green and blue are formed different. The method of claim 1, The area of the transparent electrode is a plasma display panel, characterized in that the larger the discharge cells to implement the blue, red, green. The method of claim 1, And a transparent electrode area ratio of the discharge cells implementing the blue, red, and green colors is 1.1 to 1.2: 0.9 to 1.1: 0.8 to 0.9. The method of claim 1, And the sustain electrode pair includes a bus electrode formed on the transparent electrode. The method of claim 1, A dielectric layer formed to cover the substrate and the sustain electrode pair; And a protective film formed to cover the dielectric layer. The method of claim 1, A second substrate formed to face the substrate; An address electrode formed on the second substrate; And a partition wall formed between the substrate and the second substrate. The method of claim 6, And the area of the transparent electrode is differently formed for each discharge cell by removing a portion in a direction orthogonal to the partition wall. The method of claim 6, And an area of the transparent electrode is formed to be different for each of the discharge cells by removing a part of the transparent electrode in a direction parallel to the partition wall.