KR19980035144A - Plasma display panel - Google Patents

Abstract

According to the present invention, in the fabrication of a color plasma display panel, after forming the top electrode (sustain electrode) during the manufacturing process of the top plate, a black matrix is formed of a black dielectric layer to improve contrast and prevent cross talk with adjacent sustain electrode pairs. It would be.

Description

Plasma display panel

1 is a cross-sectional view of a cell of a PDP.

2 is a front view of the panel.

3 is a front view of the top panel formed by the present invention.

4 is a discharge shape diagram between two sustain electrodes.

Explanation of symbols on the main parts of the drawings

50: pair of sustain electrodes 51: partition wall

52: phosphor layer

53: Black matrix made of black dielectric formed on the top plate.

The present invention is to prevent the contrast shape and crosstalk of the color plasma display.

One of the reasons for the rise of various flat panel devices as a new display device in the future is light, thin, and a small area, which occupies the whole area. Particularly, many research activities are being carried out for home use. : Hereinafter referred to as PDP). In particular, PDPs are in the spotlight in the large display element area (diagonal size: 40 inches to 55 inches).

As shown in FIG. 1, the basic unit of the PDP includes two insulating substrates: a front plate 1 on which an anode electrode 3 is formed, and a back plate 2 on which a cathode electrode 4 is formed. The partition is formed inside.

That is, to prevent crosstalk (color crosstalk) between the orthogonal cathode electrode group, the anode electrode group, and the electrodes, and to form a screen contrast, a black partition 7 is formed to enclose a gas therein. The intersections of the electrodes formed on the upper and lower substrates correspond to one pixel. A voltage of 100 volts or more is applied between the two electrodes, and the gas is glow discharged to display using light emission at that time.

These barrier ribs have a width of about 100 µm and a height of 100 µm or more. In the case of 20-inch color, products of 640 × 480 display cells are commercially available, and the number of partitions 7 forms 640 × 3 (RGB) partitions. It is supposed to be.

At present, the partition wall 7 is formed by mixing a ceramic powder with an organic binder, a solvent, and the like to form a paste using a thick film printing method, followed by drying and baking.

In forming the cathode electrode 4, the method of printing the paste which mixed the electrode powder, an organic binder, a solvent, etc. is used.

In addition, the front plate 1 and the back plate 2 is a structure of a state sealed by frit glass, the gas (GAS) is a pressure of 100 ~ 600 torr (TOrr) inside the sealed structure, so configured The panel unit combines with the driving unit to serve as a display element, and a unit (UNIT) composed of a combination of the panel unit and the driving unit is used for a television, a monitor, a display device for indoor and outdoor advertisements, and the like.

The PDP excites gaseous gas atoms at the time of discharge in the discharge space, generates ultraviolet rays when the excited atoms return to the ground state, and uses the ultraviolet rays to excite the phosphor to display color.

The lifetime of an atom in this excited state is about 0.01usec, and the specific one has a lifetime of about 1 to 10 mesec.

The latter diffuses slowly during discharge and impinges on structures such as bulkheads, where they recombine and disappear. Since atoms excited with a long lifetime are easily ionized by the collision of electrons and generate ion atoms, the more they exist in a space, the more likely they are to be ionized, stabilize the discharge, and reduce the discharge voltage.

Therefore, the larger the discharge space is, the more advantageous it is. Therefore, studies have been made to reduce the pixel area and widen the discharge space.

Currently, the gas used mainly uses helium (He) and gas (called penning gas) containing 2% of xenon (Xe).

Referring to the process of manufacturing the PDP,

(1) First, a cathode electrode is formed on the lower insulating substrate by a printing method. In this case, the insulating substrate is mainly a glass plate.

This glass plate should be light-transmitting and uniform in thickness, and usually uses float glass. In other words, the glass composition is SiO ₂ , Al ₂ O ₃ , MgO ₂ , Cao, Na ₂ O, K ₂ O, Pbo, B ₂ O _{3 It} is a glass consisting of a combination with the minor components.

As the electrode material used for the cathode, conductor metals such as Ni, Cu, Ag, Al, or Pd and alloys thereof are generally used.

Or the paste which mixed a small amount of glass with these metals is used.

(2) The cathode electrode is baked and a partition is formed.

As a material for forming the partition wall, an insulating paste which has black insulation and is calcined and densified at about 450 to 700 占 폚 is preferable.

For example, by weight% SiO ₂ 13-17%, Al ₂ O ₃ 18-22%, Fe ₂ O ₃ 8-12%, Cr ₂ O ₃ 2.5-3.5%, MnO 5-10%, CoO 1.5- 12.5%, there may be mentioned that the screen made of a PbO paste to the ceramic powder 30 to 40%, B ₂ O ₃ 5 to 10%.

(3) When the phosphor layer 8 is formed by the printing method on the electrode surface of the partition and the lower substrate, the lower substrate portion is completed.

(4) In the upper substrate, the anode is formed on the glass, which is mainly composed of ITO.

The electrode material used for the anode is preferably a transparent electrode (ITO electrode) on which indium oxide and tin oxide are deposited. (ITO stands for Indium-Tin Oxide.)

In order to form a large screen, when the size of the glass increases and the electrode becomes longer, the end of the voltage applied by the ITO electrode causes a voltage drop caused by the ITO electrode, resulting in poor display quality, such as not emitting part at a desired driving voltage. In order to prevent such a problem, a structure for improving the voltage drop by forming a three-layer electrode of Cr-Cu-Cr on the side of the anode is commercially available.

A dielectric layer 5 (Sio ₂ and PbO as main components) is formed in the upper substrate portion by the printing method. The purpose is to reduce the driving voltage by generating wall charges.

The protective layer 6 (MgO layer) is applied thereon, and its purpose is to prevent the dielectric layer from being damaged by the discharge phenomenon and reducing its life.

As the formation method, the method by the vapor deposition method is used, and the method by printing is being studied.

When the upper and lower substrates formed in this way are sealed by frittgrass, a sealed space is formed. The above-mentioned gas is enclosed in this space. In the previous step, a hole is drilled in the side of the upper glass, and the gas injection glass tube is bonded to this hole, and the bonding method uses fritgrass.

The degree of vacuum is usually about 10 ^-6 torr when the air in the panel is sealed and exhausted through this hole. The gas is injected by the gas injection device (input as described above), and the glass tube is sealed with heat to form a complete sealing space. do.

The driving circuit is coupled to the panel thus formed to complete one display element.

Major improvements in current PDPs include power consumption, brightness and lifetime.

Among them, the main problem of lifetime is to reduce lifetime due to deterioration of phosphor.

To solve this, a protective layer is used.

First, the electrode structure of the recent PDP is a structure in which the anode electrodes are arranged side by side in two rows on the upper substrate, the cathode electrode is formed on the lower substrate. Assuming that the anode electrodes are X1 and X2 for convenience, and the cathode electrode is Y, a simple process of discharging the PDP causes an initial discharge between X1 and Y, and at this time, priming occurs. Priming has the effect of reducing the total power consumption by lowering the discharge holding voltage lower than the initial discharge start voltage that causes continuous discharge by the initial discharge.

The display is then implemented by the discharge sustaining phenomenon between X1 and X2.

As far as is known, one of the major challenges of color plasma displays is that the contrast is not so clear compared to other displays (e.g. color water tubes) that the contrast of the contrast is not clear.

In order to improve the problems of the conventional invention, the present invention is to form a black matrix on the top plate to improve the contrast of the color plasma display.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of the color plasma display viewed from the front.

As shown in FIG. 2, the bottom plate is formed by vertically printing the desired pattern 10 times or by digging the desired pattern by sandblasting after front printing, and the red walls (R), The phosphor layer 52 of green (G) and blue (B) enters constantly by methods, such as printing and exposure. On the other hand, two rows of sustain electrodes 50 formed by a photo process or the like are repeatedly placed at regular intervals.

Referring to the operation of the plasma display, a discharge is applied by applying a voltage between two rows of sustain electrodes 50 to excite the phosphor 52 between the partition walls 51 to emit light with ultraviolet rays generated at this time.

In the present invention, the sustain electrode 50 is completed on the top plate, and then a black dielectric is added to the same top plate in the shape of the black matrix 53 by the printing method. In detail, a black dielectric is printed in a stripe shape between the portion (vertical) that forms the partition 52 and the sustain electrodes 50 formed at regular intervals (horizontally) to serve as a black matrix. It is. (Third degree)

4 shows the plasma formation between the two sustain electrodes 50. Phosphors excited by the plasma formed as shown in FIG. 4 are mostly between two sustain electrodes 50 or around two sustain electrodes 50 and there is almost no decrease in luminance due to the newly formed black matrix. .

In order to satisfy these conditions, the width of the black matrix is vertical, so the partition formed in the vertical is not visible, so the black is better, and the width of the black matrix is also affected by the width of the bulkhead. It should be the same or a little smaller. If it is too small, the top of the bulkhead is visible, so there is no meaning of black matrix formation. As a result of the experiment, the width of the vertical black matrix should be more than 90% of the width of the bulkhead. On the other hand, the horizontal case should be formed at the center between the pair of sustain electrodes 50 and the other pair of sustain electrodes 50 'is the most. All of the below are efficient and the width is 50um ~ 150um to improve the contrast and the experimental results are not greatly visible. In addition, the horizontal black matrix on the top plate serves to prevent crosstalk with adjacent cells, which may be caused by an insulating layer between adjacent sustain electrodes.

When presenting an embodiment of the present invention configured as described above and the effect is as follows.

Example 1 6 × 6 Cell Production

Cell Pitch 430 μm Pixel (R.G.B trio) Pitch 1260 μm

Vertical Black Matrix Width (㎛) Vertical Black Matrix Width (㎛)

Note) Contrast and luminance are relative values when vertical black matrix is equal to Rib width.

Example 2

Horizontal Black Matrix width (㎛) Horizontal Black Matrix width (㎛)

Note) Contrast and luminance are relative values of 100 when the horizontal black matrix is 100 µm.

Claims (7)

Between the upper plate (front plate) on which the anode electrode is formed and the lower plate (back plate) on which the cathode electrode is formed, there is a partition for color selection, and phosphors (red, green, blue) are formed therebetween. In a color plasma display in which a top plate and a bottom plate are encapsulated and a gas is formed therein to discharge a discharge between electrodes formed on upper and lower substrates to excite and emit phosphors. Color plasma display panel having a structure having a black matrix on the top plate (viewing surface). The method of claim 1, A color plasma display panel having a horizontal black matrix structure at the center of a distance between a pair of sustain electrodes and a pair of sustain poles adjacent to each other. The method of claim 2, The horizontal black matrix width 50 ~ 150㎛ color plasma display panel. The method of claim 1, Color plasma display panel with vertical black matrix formed perpendicular to the sustain electrode. The method of claim 4, wherein Black matrix width (w) is 0.9D≤W≤D when compared to the partition width (D) color plasma display panel. Between the upper plate (prote plate) on which an anode electrode is formed, and the lower plate (back plate) on which a cathode electrode is formed, there is a partition for color selection, and phosphors (red, green, blue) are formed therebetween. In a color plasma display in which an upper plate and a lower plate are encapsulated and a gas is formed therein to discharge a discharge between electrodes formed on upper and lower substrates to excite and emit phosphors. A color plasma display panel with a black matrix on the top plate. The method of claim 6, The length of the vertical black matrix is compared with the width of the bulkhead (D). 0.9D ≤ vertical black matrix width ≤ D and the horizontal black matrix is located at the midpoint of the distance between a pair of sustain electrodes and a pair of adjacent sustain electrodes, and the width is in the range of 50 to 150 µm. Color Plasma Display Panel.