KR100583321B1 - Plasma display panel - Google Patents

Abstract

The present invention relates to a structure of a plasma display panel.

In the plasma display panel according to the present invention, the discharge space is surrounded by partition walls having short sides and long sides, and at least one surface of the short sides of the partition walls forms protrusions to form irregularities.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}             

1 is a perspective view of a conventional three-electrode plasma display panel.

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

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

4A to 4F are views showing the manufacturing process of the partition wall according to the present invention.

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

4Y, 4Z: transparent electrode 6Y, 6Z: bus electrode

10,11: upper substrate 12,32,62: lower substrate

14,16,34,36,66: dielectric 18,38: protective film

20,40: bulkhead 50,60,90: bulkhead protrusion

74: mask 80: sand blasting injection device

70a, 70b: bulkhead paste

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a plasma display panel, and more particularly to a plasma display panel for improving discharge efficiency.

Plasma Display Panel (hereinafter referred to as "PDP") is used to excite and emit phosphors by using ultraviolet rays generated when an inert mixed gas such as He + Xe, Ne + Xe, He + Xe + Ne is discharged. Will be displayed. Such PDPs are not only thin and large in size, but also have improved in image quality due to recent technology development.

Referring to FIG. 1, a discharge cell of a three-electrode AC surface discharge type PDP includes a scan electrode 8Y and a sustain electrode 8Z formed on the upper substrate 10, and an address electrode formed on the lower substrate 12. 2) is provided.

Each of the scan electrode 8Y and the sustain electrode 8Z has a line width smaller than that of the transparent electrodes 4Y and 4Z and the transparent electrodes 4Y and 4Z, and is formed on one edge of the transparent electrodes 4Y and 4Z. Bus electrodes 6Y and 6Z. The transparent electrodes 4Y and 4Z are usually formed on the upper substrate 10 using indium tin oxide (ITO) as a material. The metal bus electrodes 6Y and 6Z are formed of a metal such as chromium (Cr) on the transparent electrodes 4Y and 4Z, thereby reducing the voltage drop caused by the transparent electrodes 4Y and 4Z having high resistance. The upper dielectric layer 14 and the passivation layer 18 are stacked on the upper substrate 10 on which the scan electrode 4Y and the sustain electrode 4Z are formed. The upper dielectric layer 14 accumulates wall charges generated during plasma discharge. The protective film 18 protects the upper dielectric layer 14 from sputtering generated during plasma discharge and increases the emission efficiency of secondary electrons. As the protective film 18, magnesium oxide (MgO) is usually used.

The address electrode 2 is formed on the lower substrate 12 in a direction crossing the scan electrode 8Y and the sustain electrode 8Z. The lower dielectric layer 16 and the partition wall 20 are formed on the lower substrate 12 on which the address electrode 2 is formed. The phosphor layer 22 is formed on the surfaces of the lower dielectric layer 16 and the partition wall 20. The partition wall 20 is formed parallel to the address electrode 2 to structurally distinguish the discharge cells, and prevents ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells. The phosphor layer 22 is excited and emitted by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. An inert mixed gas such as He + Xe, Ne + Xe or He + Ne + Xe for discharging is injected into the discharge space of the discharge cells provided between the upper and lower substrates 10 and 12 and the partition wall 20.

The discharge principle of the PDP is as follows. When voltage is applied between the electrodes, electrons in the gas are accelerated toward the positive electrode. High-speed electrons collide with the neutral gas, and the neutral gas, which is energized by the collision, undergoes an ionization process that separates positive ions and electrons, or moves the outermost electrons of the neutral gas to a high energy level. Here's what happens. Among these, the neutral gas in which the excitation process takes place returns to the ground state of low energy, and the energy corresponding to the difference is emitted in the form of ultraviolet light having a specific wavelength. The phosphor absorbs the ultraviolet rays generated at this time, is excited to a high energy state, and then returns to the ground state to emit light energy and visible light.

The luminous flux of visible light emitted through this process is as follows.

F = Kβηｈγψ

Where F is the luminous flux of the visible light, K is the phosphor coating area in the discharge beam, β is the discharge cell escape efficiency of the phosphor emission visible light, η is the quantum efficiency of the phosphor, ｈ is the energy of visible light, γ is the visibility, ψ is the discharge It means the ultraviolet light flux reaching the cell unit area. This equation shows that one of the displacement factors that determine the luminous flux of visible light is the coating area of the phosphor, and the luminous flux of the visible light increases in proportion to the coating area of the phosphor. The large luminous flux of visible light means that the discharge efficiency of the PDP is good.

Considering that the overall efficiency of the PDP is less than 1%, various ways to improve the efficiency of the PDP are being studied, and one of them is improving the luminous efficiency of the phosphor in the discharge space.

Accordingly, an object of the present invention is to provide a structure of a PDP that can increase the discharge efficiency.

In order to achieve the above object, a PDP according to the present invention includes a closed partition having short sides and long sides, and at least one protrusion projecting from at least one of short and long sides of the closed partition walls. panel.

The protrusions are several or more.

The protrusion does not involve the center of the discharge space in which the main discharge occurs.

The spacing between the protrusions is 30 μm or more.

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

Hereinafter, the PDP according to the present invention will be described in detail with reference to FIGS. 2 to 4F.

2 is a perspective view illustrating a PDP according to a first embodiment of the present invention.

Referring to FIG. 2, the discharge cell of the PDP according to the present invention has a structure in which discharge spaces separated by partition walls 40 are formed between the upper substrate 30 and the lower substrate 32. The upper substrate 30 includes a scan electrode 28Y to which a discharge cell is mainly applied to scan a discharge cell and cause a sustain discharge, and a sustain electrode 28Z to which a voltage to mainly generate a sustain discharge is applied, and a scan electrode 28Y and sustain. An upper dielectric layer 34 and a protective film 38 that are sequentially stacked on the electrode 28Z are formed. The lower substrate 32 includes an address electrode 22 to which a voltage for addressing a discharge cell is applied, a partition wall 40 and a partition wall 40 which structurally distinguish the lower dielectric layer 36 and the discharge cell stacked on the address electrode. The phosphor layer 32 coated on the lower dielectric layer 36 is formed.

Each of the scan electrode 28Y and the sustain electrode 28Z has a line width smaller than the line widths of the transparent electrodes 24Y and 24Z and the transparent electrodes 24Y and 24Z, and the metal bus electrodes 26Y and 26 are formed at one edge of the transparent electrode. 26Z). The transparent electrodes 24Y and 24Z are usually formed on the upper substrate 30 using indium tin oxide (ITO) as a material. The metal bus electrodes 26Y and 26Z are usually formed of metals such as chromium (Cr) and formed on the transparent electrodes 24Y and 24Z to reduce the voltage drop caused by the transparent electrodes 24Y and 24Z having high resistance. The upper dielectric layer 34 is formed on the upper substrate 30 so that polarization occurs when a voltage is applied and accumulates wall charges during plasma discharge. The protective film 38 protects the upper dielectric layer 34 from sputtering generated during plasma discharge and increases the emission efficiency of secondary electrons. As the protective film 38, magnesium oxide (MgO) is usually used.

The address electrode 22 is formed on the lower substrate 32 in a direction crossing the scan electrode 28Y and the sustain electrode 28Z. The lower dielectric layer 36 and the partition wall 40 are formed on the lower substrate 32 on which the address electrode 22 is formed. The partition wall 40 is formed in parallel with the address electrode 22 to structurally distinguish the discharge cells, and prevents ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells. An inert mixed gas such as He + Xe, Ne + Xe or He + Ne + Xe is injected into the discharge space of the discharge cell provided between the upper and lower substrates 30 and 32 and the partition 40 to discharge ultraviolet rays during discharge. do. The phosphor layer 42 is coated on the lower dielectric layer 36 and the partition 40. The phosphor layer 42 is excited and emitted by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue.

The partition wall 40 of the PDP according to the present invention is characterized in that the protrusion 50 is formed on the short side. In the PDP, since the red, green, and blue subpixels form one pixel to implement color, one subpixel has a rectangular structure having short sides and long sides as shown in the drawing. In addition, since the sustain discharge during discharge of the PDP occurs between the scan electrode 28Y and the sustain electrode 28Z, it occurs in the form of a circle having the short side of the discharge cell as the diameter as shown in the figure. Spaces other than the discharge region of the discharge space do not directly affect the discharge. In the PDP according to the present invention, the partition wall 40 is formed into an uneven shape in order to enlarge the application area of the phosphor in such a space. Therefore, as shown in Equation 1, the application area of the phosphor can be increased to increase the luminous flux of visible light, thereby increasing the efficiency of the PDP.

3 is a perspective view illustrating a PDP according to a second embodiment of the present invention.

Referring to FIG. 3, a discharge cell of a PDP according to the present invention has a structure in which a discharge space divided by a partition wall 40 is formed between an upper substrate 30 and a lower substrate 32. The upper substrate 30 includes a scan electrode 28Y to which a discharge cell is mainly applied to scan a discharge cell and cause a sustain discharge, and a sustain electrode 28Z to which a voltage to mainly generate a sustain discharge is applied, and a scan electrode 28Y and sustain. An upper dielectric layer 34 and a protective film 38 that are sequentially stacked on the electrode 28Z are formed. The lower substrate 32 includes an address electrode 22 to which a voltage for addressing a discharge cell is applied, a partition wall 40 and a partition wall 40 which structurally distinguish the lower dielectric layer 36 and the discharge cell stacked on the address electrode. The phosphor layer 32 coated on the lower dielectric layer 36 is formed.

In FIG. 3, the same reference numerals are used for the substantially same components as in the above-described embodiment, and detailed description thereof will be omitted.

The partition wall 40 of the PDP according to this embodiment is characterized in that formed in the concave-convex shape by forming a plurality of protrusions 60 on the short side. In the figure, a partition wall 40 having two protrusions 60 is shown. The distance between the plurality of protrusions 60 is 30 μm or more. This is because the thickness of the applied phosphor is 10 μm or more, so that the phosphor is applied efficiently, and the distance between the protrusions 60 should be 30 μm or more in order to substantially increase the phosphor application area.

Meanwhile, according to the exemplary embodiments of the present invention described with reference to FIGS. 2 and 3, the length of one or more protrusions 50 and 60 formed on the partition wall 40 included in each discharge cell is 10 to 100 μm, and each protrusion 50 , 60) has a width of 25 to 80 µm. Here, if the lengths of the protrusions 50 and 60 are 10 μm or less, there is almost no effect of widening the coating area of the phosphor, and when 100 μm or more, the space for discharging the electric discharge is too narrow, so that the discharge is less likely to occur. . In addition, when the width of the protrusions 50 and 60 is 25 μm or less, the protrusions 50 and 60 may be depressed or severely deformed when the protrusions 50 and 60 are fired. It functions as a partition wall that partitions the discharge cells, resulting in a narrowing of the discharge space and a decrease in the phosphor coating area.

Therefore, one or more protrusions 50 and 60 according to an embodiment of the present invention may be formed, and the length of the protrusions 50 and 60 is 10 to 100 μm, the width is 25 to 80 μm, and two successive protrusions are provided. The spacing of must satisfy the condition of 30㎛ or more. For example, the number of the protrusions 50 and 60 according to the embodiment of the present invention may be one or more and six or less.

The PDP according to the present invention may increase the coating area of the phosphor by forming protrusions on the long sides of the barrier ribs as well as forming protrusions on the short sides of the barrier ribs as shown in the above-described embodiments. When the protrusions are formed on the long side of the partition wall, the length and width of the protrusions may be different from those when the protrusions are formed on the long side, but the distance between two successive protrusions must satisfy a condition of 30 μm or more.

The partition wall of the PDP according to the present invention may be any known technique, such as a screen printing method, an additive method, a photosensitive paste method, a LTCCM (Lovw Temperature Corature Ceramic on Metal) method, and a sand blasting method. Can be used.

A method of manufacturing a partition wall according to the present invention using the sand blasting method will be described with reference to FIGS. 4A and 4G as follows.

Referring to FIG. 4A, a dielectric 66 is formed on a lower substrate 62 including an address electrode (not shown), and barrier pastes 70a and 70b having predetermined heights are formed on the dielectric 66. Is formed. The partition pastes 70a and 70b are formed by a printing method or a coating method, and are configured such that the white layer paste 70a and the black layer paste 70b are sequentially stacked.

Referring to FIG. 4B, dry film resins (hereinafter, referred to as DFRs) are formed on the barrier pastes 70a and 70b. The DFR 72 is bonded to the partition black paste layer 70b through a laminating process. The laminating process is a process of bonding the DFR 72 by applying a predetermined temperature of heat and a uniform pressure.

Referring to FIG. 4C, the mask 74 is aligned on the DFR 72 and light is irradiated. The mask 74 has a protrusion 90 which is a feature according to the invention so that it is aligned so that the rib-shaped partition wall shape comes out. After the process, light is blocked in the area covered with the mask, and the shape of the partition remains.

Referring to FIG. 4D, the developing step of the DFR 72 is performed following the exposure step. By the developing process, the DFR 72 of the region not exposed to light remains on the black layer partition paste 70b, while the DFR 72 of the region exposed to the light is etched and removed.

Referring to FIG. 4E, the sand blasting apparatus 80 is driven to spray sand particles onto the partition paste. At this time, the partition pastes 70a and 70b are shaved due to the sputtering of the sand particles, while the pastes 70a and 70b corresponding to the partition walls are protected by the DFR 72 pattern. Eventually the partition formed after the sandblasting process appears.

Referring to FIG. 4F, a separation process is performed on the partition wall formed after the sand blasting process. By this peeling process, the DFR 72 is peeled off. Subsequently, the barrier pastes 70a and 70b are fired. As a result, a partition is formed, and a protrusion is formed at a short side of the partition to form an uneven shape.

 As described above, the plasma display panel according to the present invention can increase the discharge area by increasing the light emitting area of the phosphor.

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)

A pair of parallel scan electrodes and sustain electrodes formed on one side of the upper substrate are disposed, and a plurality of address electrodes are disposed on the lower substrate in a direction crossing the scan electrodes and the sustain electrodes, and the discharge space is divided on the lower substrate. And a three-electrode surface discharge plasma display panel in which a prescribed partition is formed, and a phosphor is formed between the partitions. A closed bulkhead composed of short sides and long sides; And at least one protrusion protruding from at least one of the short side and the long side. The method of claim 1, The length of each of the protrusions is a plasma display panel, characterized in that 10 ~ 100㎛. The method of claim 1, The width of each of the protrusions is 25 ~ 80㎛ plasma display panel, characterized in that. The method of claim 1, And a spacing between two successive protrusions is 30 μm or more. The method of claim 1, Wherein the protrusions protrude from two short sides or two long sides, and each of the protrusions protruding from the two short sides or the two long sides is formed on the same straight line to face each other. The method of claim 1, Wherein the number of protrusions is one or more and six or less.

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