KR100347933B1 - A flexible base plate for plasma display panel - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel (hereinafter referred to as a PDP) constituting an information display unit of a plasma display device as a flat panel display device using a penning gas for a discharge phenomenon.

A base substrate composed of a surface substrate and a rear substrate having a predetermined space therebetween and having the same thermal expansion coefficient, and a discharge gas being injected into a discharge space between the surface substrate and the rear substrate, In the flexible base substrate of the plasma display panel made of a sealing material for bonding the substrate and the back substrate to each other; The surface substrate is formed in a planar shape, and the rear substrate has a central curvature R protruding at a predetermined curvature R from both ends thereof to maintain a constant discharge distance due to deformation due to thermal expansion during bonding, and the rear substrate and the surface substrate. In addition to using the same material as the coefficient of thermal expansion of the back substrate is thinner than the conventional thickness can be curvature adjustment to provide the effect of reducing the raw material cost.

Description

Flexible base plate for plasma display panel

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel (hereinafter referred to as a PDP) constituting an information display portion of a plasma display device as a flat panel display device using penning gas for a discharge phenomenon. The present invention relates to a flexible base substrate of a plasma display panel, which is formed to protrude so that the protruding center portion becomes almost straight due to thermal deformation when the rear substrate and the surface substrate are bonded to each other.

In the 21st century, information and electronics technology will be further accelerated and developed by ultra high-speed information and communication technology and computers, and the core element technology supporting this is high value-added semiconductor and display technology.

Until now, the concept of display has been focused on the limited area of CRT (cathode-ray tube) univariate.However, with the development of the information society, the amount of information that humans can access is enormous and various types of information carriers. The concept of multimedia is emerging as an integrated concept. In this multimedia era, the importance of display is that most information is delivered through human visual functions and the use environment of the device is diversified.

For example, in the case of a device used in an environment where mobility is emphasized, such as a personal portable device, an automobile, an aircraft, and the like, light and small and low power consumption may be important factors. Display characteristics of a large screen are required. Representative items such as flat panel displays include liquid crystal displays (LCDs), plasma display panels (PDPs), field emission displays (FEDs), etc. Among these, CRTs have CRTs due to low cost and large size using thick film technology. Next generation display to replace the most in the spotlight.

The PDP has an advantage of being easier to manufacture due to the characteristics of the manufacturing process than other display elements in implementing high definition television (HDTV) of 40 Hz or more, and is widely used in wall-mounted TVs, home theater displays, and various monitors. Is being applied.

In general, a PDP is a flat panel display device using a penning gas for a discharge phenomenon, and constitutes an information display unit of a plasma display device. The PDP is divided into an AC type and a DC type according to a discharge method.

A typical AC PDP is composed of a surface substrate 1 and a rear substrate 5 positioned opposite to each other with a predetermined space therebetween as shown in FIGS. 1A and 1B.

The display electrode 2 is formed on one surface of the surface substrate 1 so as to be arranged in parallel with each other, and the display electrode 2 is disposed on an opposite surface of the rear substrate 5 to the surface substrate 1. The address electrodes 6 are arranged in parallel with each other so as to be orthogonal to each other. In this case, the display electrode 2 and the address electrode 6 are formed on a stripe.

In addition, a dielectric layer 3 having a uniform thickness is formed on the display electrode 2 to limit the discharge current during discharge and facilitate the generation of wall charges, and sputtering occurs during discharge on the dielectric layer 3. A magnesium oxide protective film 4 is deposited to protect the display electrode 2 and the dielectric layer 3.

In addition, partition walls 7 are formed between the surface substrate 1 and the rear substrate 5 to separate the address electrodes 6 into a plurality of discharge cells to prevent color mixing between cells and to secure a discharge space. On the address electrode 6, phosphors 8 divided into red, green and blue are coated.

In addition, a discharge gas such as neon (Ne), helium (He), xenon (Xe), or the like is injected into the discharge space between the surface substrate 1 and the rear substrate 5, and the surface substrate 1 and the rear substrate. 5 is frit-sealed using the hardened sealing material 9.

A sustain pulse voltage (or sustain voltage) is applied to the display electrode 2 and the address electrode 6 of the PDP configured as described above, and a discharge start voltage is applied between the display electrode 2 and the address electrode 6. When an overwriting voltage is applied, discharge starts in the discharge cell. That is, the discharge occurs on the surface of the dielectric layer 3 and the protective layer 4 in the discharge cell to generate ultraviolet rays. The fluorescent material applied to the back substrate 5 is excited by such ultraviolet rays and is converted into visible light corresponding to red, green, and blue colors, respectively, thereby generating a screen on the surface substrate 1.

By the way, the surface substrate 1 and the back substrate 5 bonded by the frit sealing are required to be calcined in order to complete the PDP. In this case, due to the difference in the coefficient of thermal expansion (CTE) of the two, Due to the thermal stress generated, the surface substrate 1 and the rear substrate 5 formed of glass may have a plastic defect such as distortion or cracking, and the raw material cost is expensive.

In addition, as shown in FIG. 2, due to the adhesive force of the sealing material 9, the rear substrate 5 has a curvature in which its center portion is concave toward the ground, which causes a height deviation of the partition wall 7. Therefore, there is a problem in that the discharge distance cannot be kept constant because the discharge distance in the discharge space is not constant.

The present invention has been made to solve the above problems of the prior art, the object is that the rear substrate is formed to have a certain curvature, the discharge distance may be constant by deformation due to thermal deformation when bonding, In addition to using a material having the same thermal expansion coefficient as the surface substrate, the back substrate has a thinner thickness than the conventional one, so that curvature can be adjusted, thereby providing a flexible base substrate of a plasma display panel which can reduce raw material costs.

1A is a block diagram illustrating a structure of a general plasma display panel (hereinafter referred to as a PDP).

1B is a partial cross-sectional view of FIG. 1A,

2 is a view showing a bending state of the back substrate generated when PDP bonding;

3 is a view illustrating a bonding process of a surface substrate and a rear substrate by a flexible base substrate of a plasma display panel according to the present invention.

<Explanation of symbols on main parts of the drawings>

10: surface substrate 11: display electrode

12 dielectric layer 13 protective film

20: back substrate 21: address electrode

22: partition 23: phosphor

30: sealing material

According to a first aspect of a plasma display panel flexible base substrate according to the present invention for solving the above problems, a base made of a surface substrate and a rear substrate which are positioned to face each other with a predetermined space therebetween and have the same thermal expansion coefficient. (base) a substrate and a sealing material for bonding the surface substrate and the rear substrate to each other after the discharge gas is injected into the discharge space between the surface substrate and the rear substrate;

The base substrate has the surface substrate formed in a planar shape, and the rear substrate has a central portion protruding at a predetermined curvature R relative to both ends thereof, so that the discharge distance is kept constant by deformation due to thermal expansion during bonding.

Further, according to the second aspect of the present invention, the back substrate of the base substrate is formed such that the curvature R resulting from the elastic modulus (E) cross-sectional coefficient (I) / bending moment (M) is 200,000 or more. .

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

3 is a view illustrating a bonding process of a surface substrate and a rear substrate by a flexible base substrate of a plasma display panel according to the present invention. Referring to the present invention, a display electrode is formed on one surface of the surface substrate 10 similarly to the related art. 11 is formed, and the address electrode 21 is formed on the back substrate 20 so as to be orthogonal to the display electrode 11.

In addition, a dielectric layer 12 and a magnesium oxide protective layer 13 are sequentially formed on the display electrode 11, and inter-cell mixing is prevented between the surface substrate 10 and the rear substrate 20 to secure a discharge space. The barrier ribs 22 are formed to be arranged so that the phosphors 23 divided into red, green, and blue are coated on the address electrodes 21.

In addition, discharge gas such as neon (Ne), helium (He), and xenon (Xe) is injected into the discharge space between the surface substrate 10 and the back substrate 20, and the surface substrate 10 and the rear substrate are injected. 20 is bonded using the cured sealing material 30.

However, the part of the present invention is different from the prior art, both the base substrate consisting of the back substrate 20 and the surface substrate 10 is formed by using a Ti sheet (sheet) having the same thermal expansion coefficient, the back substrate 20 is Considering the deformation due to thermal expansion during bonding using the sealing material 30, the center portion thereof is projected by a certain curvature R relative to both ends.

At this time, the curvature (R) to determine the degree of bending of the back substrate 20 is to obtain an appropriate value using the bending moment (M), the elastic modulus (E), the cross-sectional coefficient (I) Equation 1 to obtain the curvature Is as follows.

Here, the M = 1㎏ / ㎟, E = 10800㎏ / ㎟, I = 900 × 0.5 3/6 , and usually R≥200,000.

After obtaining the curvature R using the above Equation 1, if the back substrate 20 is formed to be bent as shown in FIG. 4, the surface substrate 10 and the back substrate 20 are the back substrate 20. The back substrate 20 is deformed by thermal expansion while being bonded to each other by the sealing material 30 positioned at both ends of the back panel.

At this time, the rear substrate 20 has a central portion which protrudes toward the surface substrate 10 to protrude to the opposite side due to thermal deformation and becomes almost straight, so that the distance between the partition wall 22 and the surface substrate 10 is kept constant. Therefore, the discharge distance is constant so that the discharge amount can be kept constant.

The flexible base substrate of the plasma display panel of the present invention configured as described above is formed such that the rear substrate has a predetermined curvature, so that the discharge distance may be constant due to deformation due to thermal deformation during bonding, and thermal expansion of the rear substrate and the surface substrate is performed. In addition to using the same material as the coefficient, the back substrate has a thinner thickness than the conventional one, and thus curvature adjustment can reduce raw material costs.

Claims (2)

A base substrate composed of a surface substrate and a rear substrate having a predetermined space therebetween and having the same thermal expansion coefficient, and a discharge gas being injected into a discharge space between the surface substrate and the rear substrate, It consists of a sealing material for bonding the substrate and the back substrate with each other; The base substrate has the surface substrate formed in a planar shape, and the rear substrate has a central portion protruding at a predetermined curvature R from both ends thereof, so that the discharge distance is kept constant by deformation due to thermal expansion during bonding. Flexible base substrate of a plasma display panel. The method of claim 1, And said back substrate is formed such that the curvature R resulting from (elastic coefficient (E) x section coefficient (I)) / bending moment (M) is 200,000 or more.