KR19980045923A - Plasma display panel using pupil cathode and manufacturing method thereof - Google Patents

Abstract

According to the present invention, there is provided a plasma display panel having a common pupil cathode in order to improve the brightness of a displayed image, the common pupil cathode being formed by an electroforming method to serve as a partition wall, and a manufacturing method thereof. do. The plasma display panel of the present invention comprises a back glass substrate in a scan electrode of a plurality of bands having a common pupil cathode plate formed in a lattice shape, and a front glass plate having a plurality of bands of transparent signal electrode lines. Each pixel is formed in an area where the scan electrode line and the signal electrode line intersect with the discharge space interposed therebetween. The plasma display panel according to the present invention greatly improves the brightness of an image displayed according to the pupil cathode effect, and the pupil cathodes of all the pixels are commonly connected to form a pupil cathode plate made of metal by an electroforming method. Since it is possible to manufacture a plasma display panel has the advantage.

Description

Plasma display panel using pupil cathode and manufacturing method thereof

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure and a manufacturing method of a plasma flat panel display device. The use of a pupil cathode significantly improves the brightness of a plasma display panel, and facilitates the formation of a common pupil cathode plate made of metal by an electroforming method. The present invention relates to a plasma display panel and a method of manufacturing the same.

Typical flat panel displays that have been studied as display devices for televisions, computer monitors, billboards, etc. are typically liquid crystal displays (LCDs) and electro-luminescent displays (ELDs). A plasma display panel (PDP), a vacuum fluorescent display (VFD), a field emission display (FED), and the like. However, among these flat panel displays, liquid crystal displays have technical difficulties in manufacturing large panels, and electro-luminescent displays (ELD) and vacuum fluorescent displays (VFD) have high brightness and high power consumption. There is a problem in making a practical large screen. In addition, an electroluminescent display (FED) is a display device that is currently in a development stage, and has to have a high degree of vacuum for the operation of the device, the life of the advanced electrode, which is the display electrode, is short, and foreign matter is attached to the electrode end. Many technical problems must be solved for practical use, such as deterioration of image quality. Therefore, a plasma display panel that is more easily used as a large flat panel display device is used, and is widely used as a 40-inch or larger wall-mounted display device, a large advertisement board, a large television screen, or the like.

The plasma display panel can be classified into a DC-PDP and an AC-PDP according to a driving method. In a typical plasma display panel structure, a voltage is applied to a large number of discharge spaces (pixel regions) separated by partitions and filled with a reaction gas. By causing the glow discharge (Glow Discharge), the display operation in each pixel is performed.

Such a plasma display panel has an advantage that it is easy to manufacture a large screen, but has a problem that it is not possible to provide a high quality screen due to low brightness and clarity.

Accordingly, attempts have been made to improve the brightness and clarity of the plasma display panel by developing a reaction gas having higher brightness and clarity in a glow discharge state, or developing a high-efficiency fluorescent material applied around a pixel. As compared with the plasma display panel, the luminance could not be improved much.

In addition, according to the general structure of the conventional plasma display panel, the partition wall separating each pixel area is made of an insulator. Conventional methods used to form such insulator barrier ribs include Screen Printing and Sand Blasting.

Screen printing method is to cover the mask according to the pattern of the insulator partition wall on the substrate of the plasma display panel so that only the partition area is exposed, and then repeatedly print the insulator material to the desired height and form the partition wall by high temperature process. Way. However, according to the screen printing method, since a high temperature process must be performed to form a partition, there is a problem that it is difficult to maintain uniformity of the partition due to warpage of the partition in a high temperature state.

The sand blasting method is to apply an insulator material on a substrate to a desired height, and then cover a mask according to a partition pattern so that portions other than the partition wall area are exposed, and fine particles are ejected to apply to areas other than the partition wall. A method of removing insulator material. Even in the case of the sand blasting method, since the partition pattern must be subjected to a high temperature process, there is a problem that it is difficult to maintain uniformity of the partition due to warpage of the partition in a high temperature state.

According to the conventional method of forming an insulator partition wall, it is difficult to maintain the uniformity of the partition wall, and it is difficult to reliably reproduce each pixel area, and thus there is a problem in that the rate of occurrence of errors in pixel operation is very high.

The present invention solves such a conventional problem, and an object of the present invention is to provide a plasma display panel in which brightness and clarity are greatly improved by a simple configuration.

Another object of the present invention is to provide a plasma display panel having a hollow cathode structure exhibiting a pupil cathode effect.

Still another object of the present invention is to provide a plasma display panel having a partition having improved uniformity.

It is still another object of the present invention to provide a method of manufacturing a plasma display panel having a partition wall of an improved structure.

1 is a conceptual diagram of a plasma display panel of the present invention.

2 is a cross-sectional view of the plasma display panel of the present invention.

3 is a view illustrating a process of manufacturing a front substrate portion of a plasma display panel of the present invention.

4 is a view illustrating a process of manufacturing a back substrate of the plasma display panel of the present invention.

5 is a view showing a process of manufacturing a common pupil cathode of the plasma display panel of the present invention.

Explanation of symbols on the main parts of the drawings

100: plasma display panel 102: front glass plate

104: auxiliary electrode line, signal electrode line 106: transparent insulating film

108: transparent electrode, signal electrode 110: phosphor

112 back glass substrate 114 anode wire (scanning electrode wire)

116 insulating film 118 resistor

120 anode (scan electrode) 122 insulating film

124: pupil cathode 130: front substrate portion

140: back substrate portion 210: discharge space

According to the principles of the present invention, a first substrate, an anode disposed at regular intervals from the first substrate, a transparent second substrate facing the first substrate and adjacent to the anode, is injected into the space between the first substrate and the second substrate And a plurality of reaction gases excited and glow discharged in a plasma state in response to an applied voltage, and disposed between a cathode, an anode, and a cathode disposed adjacent to the first substrate, and disposed along a plane direction of the first substrate. Pixel areas, sealing means for sealing the circumference of the plasma display panel to prevent unwanted leakage of the reaction gas, a voltage applying circuit connected to each of the anode and the cathode and applying a predetermined voltage between the anode and the cathode, and And control means for controlling the voltage so that the discharge of the reactive gas occurs only in the pixel region corresponding to the desired phase. A plasma display panel is provided, wherein an end portion of the first substrate side is blocked in an area corresponding to each of the pixel regions, and an opposite end portion thereof is formed of an open pupil.

According to another principle of the present invention, a first substrate, an anode disposed at regular intervals from the first substrate, a transparent second substrate opposed to and adjacent to the first substrate, injected into a space between the first substrate and the second substrate A reaction gas which is excited and glow discharged in a plasma state in response to an applied voltage, a cathode disposed adjacent to the first substrate, an anode and a cathode, and disposed along a plane direction of the first substrate. A plurality of pixel regions, formed by electroforming methods, partition walls for separating each pixel region, sealing means for sealing the periphery of the plasma display panel to prevent unwanted leakage of the reaction gas, each of A voltage application circuit connected to the anode and the cathode to apply a predetermined voltage, and the reaction gas only in the pixel region corresponding to the desired phase; It is up provided a plasma display panel including a control means for controlling the voltage to.

According to another principle of the present invention, a first substrate, an anode disposed at regular intervals from the first substrate, a transparent second substrate facing the first substrate and adjacent to the anode, a cathode disposed adjacent to the first substrate, the anode And a plurality of pixel regions located between the cathodes and disposed along the planar direction of the first substrate, partition walls for separating each pixel region, voltage application circuits connected to the respective anodes and cathodes, and corresponding phases, respectively. A method of manufacturing a plasma display panel including a control means for controlling a voltage so that discharge of a reactive gas occurs only in a pixel region, wherein the partition wall is formed by an electroforming method. A method for producing is provided.

The hollow cathode effect exhibited by the pupil cathode structure of the present invention refers to a phenomenon in which the current density during the glow discharge is remarkably increased when the cathode used to generate the glow discharge is in the pupil form, and the current density is increased. As a result, the luminance of the plasma display panel also increases significantly.

In addition, the electroforming method used to form the common pupil cathode of the present invention is to expose the metal layer by etching the insulator on the metal layer according to a desired pattern in order to form a protruding metal surface, It refers to a method of precisely obtaining a desired metal pattern by removing an insulator pattern after electrically laminating a metal having a sufficient thickness.

The cathode of the plasma display panel according to the present invention is composed of a hollow cathode, and greatly improves the brightness of the plasma display panel according to the hollow cathode effect. In addition, the pupil cathode according to the present invention serves as a partition between the pixel regions as a common cathode, and is formed by an electroforming method, thereby making it possible to form a uniform partition unlike a conventional insulator partition and significantly reducing errors in pixel operation. Let's go.

Other objects, features and advantages of the present invention will become more apparent from the following detailed description with reference to the drawings. Like reference numerals refer to like elements in the drawings.

1 is a conceptual diagram of a plasma display panel of the present invention. The plasma display panel 100 according to the present invention includes a rear substrate portion having a plurality of stripe scan electrodes with a common pupil cathode plate formed in a lattice shape, and a front substrate portion having a plurality of stripe transparent signal electrode lines. Each pixel is positioned in an area where the scan electrode line and the signal electrode line intersect with the discharge space formed of the pupil cathode interposed therebetween. The plasma display panel according to the preferred embodiment of the present invention has a double substrate structure. The front substrate 130 includes a glass substrate 102, a plurality of strip-shaped transparent auxiliary electrode lines 104 formed on the glass substrate 102, an insulating film 106 formed so that the transparent electrode 108 is exposed in a square shape, It consists of a phosphor 110 coated on the insulating film 106, the back substrate portion 140 is a glass substrate 112, a strip-shaped anode line 114, the anode line 114 on the glass substrate 112 is slit-shaped The insulating film 116 formed so as to be exposed to each other, the band-shaped resistor 118 formed in parallel with the anode line 114 on the insulating film 116, and the anode 120 and the square shape of each pixel having a square shape formed on the resistor 118. Is composed of an insulating film 122 formed to expose the anode 120, and a grid-shaped pupil cathode plate 124 formed on the insulating film 122.

Discharge gas is injected into the space between the front substrate 130 and the rear substrate 140, and the edges of the front substrate 130 and the rear substrate 140 are sealed to form a plasma display panel. As the discharge gas, a mixed gas of neon (Ne) and xenon (Xe) is mainly used, and a pressure of several torr to tens of torr is maintained in a sealed state. The strip-shaped transparent auxiliary electrode line 104 on the front glass substrate 102 and the strip-shaped anode line 114 on the rear glass substrate 112 are orthogonal to each other with the discharge space formed in the pupil region of the pupil cathode 124 interposed therebetween. The anode line 114 and the anode 120 are connected through a resistor 118, and the anode line 114 and the resistor 118 are connected through slits formed in the insulating film 116.

The transparent electrode 108 serves as a data electrode as a column electrode, and the anode 120 serves as a scanning electrode as a row electrode. Control of whether each pixel is displayed is performed by controlling the individual signal electrode lines 104 and the scan electrode lines 114, which are performed by a driving circuit (not shown) connected to the plasma display panel. In the driving of the plasma flat panel according to the present invention, while applying a scan voltage pulse to the selected scan electrode line 114, a signal voltage pulse is applied to the pixels to be turned on among the pixels placed on the scanned electrode line through the signal electrode line 104. The sum of the signal voltage and the scan voltage is made larger than the discharge starting voltage (Firing Voltage). The brightness of each pixel is adjusted to the time that each pixel is turned on. In order to turn on the pixels that are turned on for a predetermined time, a discharge sustain voltage is applied to the scan electrode line 114. The brightness of each pixel is controlled by turning off the pixels that are turned on. The common pupil cathode 124 is grounded and the signal voltage applies a positive polarity pulse between the signal electrode 108 and the pupil cathode 124, and the scan voltage is polarized between the scan electrode 120 and the pupil cathode 124. This negative pulse is applied, and a discharge sustain voltage having a positive polarity is applied between the scan electrode 120 and the pupil cathode 124 to turn on the pixel for a predetermined time.

2 is a cross-sectional view of the plasma display panel 100 shown in FIG. Referring to FIG. 2, it can be seen that the reaction gas is mainly filled in the pupil region where the front substrate portion 130, the rear substrate portion 140, and the pupil cathode 124 are formed to form the discharge space 210.

3 is a view illustrating a process of manufacturing the front substrate 130 of the plasma display panel of the present invention. The front substrate 130 deposits ITO (Indium Tin Oxide) on the glass substrate 102 in a plurality of strips or etches ITO deposited on the glass substrate 102 in a plurality of strips to form a transparent auxiliary electrode line. 3 (a), a transparent insulator film 106 is formed so that the square transparent electrode 108 is exposed, and FIG. 3 (b), red, green, and blue phosphors It is completed by applying 110 to the corresponding pixel (Fig. 3 (c)).

4 is a view illustrating a process of manufacturing the back substrate 140 of the plasma display panel of the present invention. The rear substrate 140 is formed of a plurality of strip-shaped anode wires 114 on the glass substrate 112 by the screen printing method [Fig. 4 (a)], and the anode wires 114 corresponding to the pixels or the boundary of the pixels. After coating with the insulator film 116 so as to expose the slit [FIG. 4 (b)], the resistor 118 is formed in a band shape by the screen printing method on the insulator film 116 in parallel with the anode line 114. Then, a square anode 120 is formed on the strip-shaped resistor 118 by the screen printing method to complete the lower portion of the rear substrate [Fig. 4 (c)].

5 is a view illustrating a process of manufacturing a common pupil cathode of the plasma display panel of the present invention. The common pupil cathode is coated with an insulator film 122 on the back substrate portion 140 completed by the process of FIG. 4 except for the square anode 120 [FIG. 5 (a)], and has a lattice-shaped pupil. In order to make the cathode, a nickel lattice line 126 is formed in a lattice shape on the boundary of each pixel by screen printing to prepare a base portion for electric poles (Fig. 5 (b)). The photosensitive film 128 is adhered on the prepared base portion as described above, and the photosensitive film is exposed, developed, and peeled so as to expose the lattice-shaped nickel lattice lines (Fig. 5 (c)). In order for the effect of the cathode to be good, the depth of the pupil must be higher than the width of the discharge space formed by the pupil cathode. do. When electroforming is performed, the nickel lattice is grown from the lattice-shaped nickel lattice lines to form the pupil cathode 124. Finally, when the remaining photosensitive film is removed, the back substrate having the lattice-shaped pupil cathode according to the present invention is formed. The addition is completed (Fig. 5 (d)). Thereafter, the edge is sealed by pasting the front substrate portion and the rear substrate portion, and a discharge gas is injected between the front substrate portion and the rear substrate portion to complete the plasma display panel.

According to the configuration of the present invention described above, the following effects can be obtained.

(1) According to the pupil-cathode structure of the present invention, since the current density during the glow discharge of the plasma display panel is greatly increased, the brightness and the clarity of the display image are greatly improved by a simple configuration.

(2) In the pupil structure having a depth greater than the width of the pupil, there is an advantage that the pupil cathode effect is more remarkable.

(3) The common pupil cathode structure of the present invention is formed by an electroforming method and serves as a partition between each pixel region, thereby providing a partition having a uniform structure as compared with a conventional insulator partition, and thus, during operation of the plasma display panel. This shows that the error in each pixel area is greatly reduced.

(4) The common pupil cathode structure of the present invention enables operation of the plasma display panel by one common cathode without forming each cathode ray, thereby enabling reliable image display by a simpler configuration.

(5) The pupil-cathode structure formed in the lattice shape according to the present invention not only has a larger holding area of the reaction gas but also facilitates pattern formation, thus enabling mass production of a reliable plasma display panel.

Although the present invention has been described above through specific examples, the scope of the present invention is not limited thereto, and various modifications are possible within the principles of the present invention. Therefore, the scope of the present invention is not limited to the above detailed description, but only by the matter described in the claims of the present invention.

Claims (7)

In the plasma display panel, A first substrate; An anode disposed at a predetermined distance from the first substrate; A transparent second substrate facing the first substrate and adjacent to the anode; A reaction gas injected into a space between the first substrate and the second substrate and excited in a plasma state to glow glow in response to an applied voltage; A cathode disposed adjacent the first substrate; A plurality of pixel regions disposed between the anode and the cathode and disposed along a plane direction of the first substrate; Sealing means for sealing the circumference of the plasma display panel to prevent unwanted leakage of the reaction gas; A voltage application circuit connected to each of the anode and the cathode and applying a predetermined voltage between the anode and the cathode; And Control means for controlling a voltage applied to cause the discharge of the reaction gas to occur only in a pixel region corresponding to a desired image of the plurality of pixel regions; Including, And the cathode is formed of a cavity in which an end portion of the first substrate side is blocked in an area corresponding to each pixel region, and an opposite end portion thereof is opened. The plasma display panel of claim 1, wherein the pupil is formed in a lattice shape. The plasma display panel of claim 1, wherein a depth of the pupil is greater than a width of the pupil. The plasma display panel of claim 1, wherein the cathode is a common cathode connected to each pixel area in common. The plasma display panel of claim 1, wherein the cathode is formed by an electroforming method, and serves as a partition wall between the pixel areas. In the plasma display panel, A first substrate; An anode disposed at a predetermined distance from the first substrate; A transparent second substrate facing the first substrate and adjacent to the anode; A reaction gas injected into a space between the first substrate and the second substrate and excited in a plasma state to glow glow in response to an applied voltage; A cathode disposed adjacent the first substrate; A plurality of pixel regions disposed between the anode and the cathode and disposed along a plane direction of the first substrate; A partition wall formed by an electroforming method, for separating the pixel areas; Sealing means for sealing the circumference of the plasma display panel to prevent unwanted leakage of the reaction gas; A voltage application circuit connected to each of the anode and the cathode and applying a predetermined voltage between the anode and the cathode; And Control means for controlling a voltage applied to cause the discharge of the reactive gas to occur only in a pixel region corresponding to a desired image of the plurality of pixel regions; Plasma display panel comprising a. A first substrate, an anode disposed at regular intervals from the first substrate, a transparent second substrate facing the first substrate and adjacent to the anode, a cathode disposed adjacent to the first substrate, between the anode and the cathode A plurality of pixel regions located in the planar direction of the first substrate, partitions for separating the pixel regions, voltage application circuits connected to the respective anodes and cathodes, and pixel regions corresponding to a desired phase. In the manufacturing method of the plasma display panel comprising a control means for controlling the voltage to cause the discharge of the reaction gas only in And the partition wall is formed by an electroforming method.