KR101023140B1 - Flat Panel Display - Google Patents

Abstract

A first substrate and a second substrate disposed at predetermined intervals and having sealing grooves formed at corresponding positions along the edges so as to keep the cell gap constant and to prevent the occurrence of vacuum leakage; The present invention provides a flat panel display device including a glass rod installed along an edge of a substrate and having a thickness corresponding to a cell gap, and a frit filled in the sealing groove and sealing the glass rod, the first substrate, and the second substrate to each other.

Flat Panel Display, Frit, Glass Bar, Sidebar, Substrate, Encapsulation, Vacuum Leak, Cell Gap

Description

Flat Panel Display {Flat Panel Display}

1 is a partially enlarged perspective view illustrating an embodiment of a flat panel display device according to the present invention.

FIG. 2 is a partially enlarged exploded perspective view illustrating a state in which a glass rod and both substrates are sealed in an embodiment of a flat panel display device according to the present invention.

3 is a partially enlarged cross-sectional view illustrating a state in which a glass rod and both substrates are sealed in an embodiment of a flat panel display according to the present invention.

4 is a partially enlarged exploded perspective view for explaining another embodiment of a sealing groove in an embodiment of a flat panel display device according to the present invention.

5 is a partially enlarged exploded perspective view for explaining another embodiment of a sealing groove in an embodiment of a flat panel display device according to the present invention.

6 is a partially enlarged perspective view illustrating another embodiment of a flat panel display according to the present invention.

FIG. 7 is a partially enlarged exploded perspective view for explaining a state in which a glass rod and both substrates are sealed in another embodiment of the flat panel display according to the present invention.

8 is a flowchart illustrating a method of manufacturing a flat panel display device according to an exemplary embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display and a method of manufacturing the same, and more particularly, to a flat panel display capable of maintaining a constant cell gap between opposing substrates and preventing spreading of frits, generation of vacuum leaks, and the like. It relates to a manufacturing method.

In general, a flat panel display (FPD) manufactures an airtight container having a predetermined internal space by installing a glass rod at a corner portion between both substrates of a front substrate and a rear substrate, and each pixel inside the container. Is a display device that implements a predetermined image by providing a structure that emits light of a predetermined color, and includes a liquid crystal display (LCD), a plasma display panel (PDP), a field emission display (FED), a fluorescent display tube (VFD), and the like. This flat panel display is widely known.

In the conventional flat panel display device, the glass rod is made of frit glass having a low firing temperature, and the cell gap between both substrates is set by the height of the frit glass.

Sealing of the two substrates in the above is made of a method of pasting the frit glass to apply or print on both substrates to seal and a method of sealing using a glass rod formed of frit glass.                         

By the way, in the method of apply | coating or printing and sealing the said glass paste on both board | substrates, it is very difficult to precisely control the cell gap between both board | substrates, and it is impossible to apply when the cell gap which is a gap between both board | substrates is large.

In the sealing method using the glass rod, the glass rod and the two substrates are sealed by a thin frit, so that a vacuum leak is likely to occur, and the cell gap may change depending on the amount of frit.

And according to the sealing method between both board | substrates which used the conventional frit glass, there exists a possibility that a frit glass may melt and spread out of a predetermined area | region.

SUMMARY OF THE INVENTION An object of the present invention is to provide a flat panel display device capable of maintaining a constant cell gap by forming a sealing groove into which frits are inserted into an inner surface of a substrate.

In addition, another object of the present invention is to form a sealing groove on the inner surface of the substrate to use a sufficient amount of frit necessary for the sealing of the glass rod to prevent the occurrence of vacuum leak and to prevent the frit from spreading to the outside of the glass rod. It is to provide a display device.

Still another object of the present invention is to provide a flat panel display manufacturing method in which a cell gap is kept constant and vacuum leakage does not occur by forming a sealing groove on an inner surface of a substrate and applying a frit to a glass rod to perform sealing. .

The flat panel display proposed by the present invention is disposed along the edges of the first substrate and the second substrate, the sealing substrate is formed at a predetermined interval and corresponding positions along the edge, and is installed along the edge of the first substrate and the second substrate And a glass rod having a thickness corresponding to the cell gap, and a frit filling the sealing groove and sealing the glass rod, the first substrate, and the second substrate to each other.

It is also possible to form a sealing groove in the glass rod at a position corresponding to the sealing groove of the first substrate and / or the second substrate.

The sealing groove may be formed to have various cross-sectional shapes such as triangle, square, semi-circle, semi-elliptic, trapezoidal shape, and the shape of the sealing groove of the first substrate and the sealing groove of the second substrate are the same or different. It is possible to.

The sealing grooves may be formed in one row, or may be formed in two or more rows.

In the method of manufacturing the flat panel display of the present invention, sealing grooves are formed at corresponding positions along edges of the first and second substrates, and frits are coated on both sides of the glass rod, and the frit coated with the glass rods is sealed. Placing and assembling between the first substrate and the second substrate so as to be located in the substrate, and baking the frit at a predetermined temperature such that the glass rod, the first substrate, and the second substrate are sealed to each other while the frit melts and fills the sealing groove. It is made, including.

Next, a preferred embodiment of the flat panel display according to the present invention will be described in detail with reference to the drawings.                     

1 shows an embodiment in which the flat panel display device according to the present invention is applied to a field emission display device.

First, as shown in FIGS. 1 to 3, an embodiment of the flat panel display device according to the present invention may include a first groove in which sealing grooves 11 and 13 are formed at positions corresponding to corners, respectively. A glass rod 14 provided along the edges of the substrate 10 and the second substrate 12 and the first substrate 10 and the second substrate 12 and having a thickness (height) corresponding to the cell gap d. And a frit 16 filled in the sealing grooves 11 and 13 and sealing the glass rod 14 and the first substrate 10 and the second substrate 12 to each other.

The sealing grooves 11 and 13 of the first substrate 10 and the second substrate 12 may be formed to have a triangular cross-sectional shape, as shown in FIGS. As shown in FIG. 5, the cross section may have a semi-circular cross section as shown in FIG. 5.

In addition, the sealing grooves 11 and 13 of the first substrate 10 and the second substrate 12 may be formed in different sizes and / or different shapes, respectively, and are formed in the same shape and the same size. It is also possible.

In addition, the sealing grooves 11 and 13 of the first substrate 10 and the second substrate 12 may be formed to have various cross-sectional shapes such as a semi-elliptic or trapezoidal shape.

The sealing grooves 11 and 13 of the first substrate 10 and the second substrate 12 may be formed in one row as shown in FIGS. 2 and 5, and as shown in FIG. 4 as necessary. Similarly, it is possible to form two rows, or to form three rows or more.                     

The depth and / or width of the sealing grooves 11, 13 is preferably set according to the amount of frit 16 to be applied, and the frit 16 is filled in the sealing grooves 11, 13 and The volume of the sealing grooves 11 and 13 is set to be larger than the amount of the frit 16 so as not to overflow and remain between the glass rod 14 and the first substrate 10 and the second substrate 12. desirable.

The amount of frit 16 to be applied is determined by the width of the glass rod 14, the magnitude of the vacuum pressure, the magnitude of the sealing force, and the like.

For example, when the width of the glass rod 14 is set to 3mm, the sealing grooves 11 and 13 are formed to have a width of about 2mm. However, as the contact area between the frit 16 and the glass rod 14 filled in the sealing grooves 11 and 13 increases, the sealing force increases, so that the width of the sealing grooves 11 and 13 is as much as possible. It is preferable to set the width close to the width of the rod 14, and set the width as wide as possible in the range that the sealing grooves 11 and 13 are not exposed to the outside of the glass rod 14 in consideration of the error during assembly. do.

It is preferable to set the depth of the sealing grooves 11 and 13 so that the frit 16 height of the degree which does not have a concern of a vacuum leak is ensured. In general, when the height of the frit glass part is 50 μm or more, it is known that there is no fear of vacuum leakage. Therefore, the depth of the sealing grooves 11 and 13 is preferably formed to be 50 μm or more. It is preferable to set the strength of the first substrate 10 and the second substrate 12 within a range of a depth that allows mechanical processing.

A plurality of cathode electrodes 20 are formed on the first substrate 10 at predetermined intervals, and a plurality of electron emission sources 24 are formed on the cathode electrode 20.

In addition, a plurality of gate electrodes 22 formed in a pattern that intersects the insulating layer 21 therebetween is formed on the cathode electrode 20.

The gate electrode 22 and the insulating layer 21 are formed by arranging a gate hole 23, which is a space for forming the electron emission source 24 and a space for electric field emission, in a predetermined pattern.

The gate electrode 22 and the cathode electrode 20 are formed in a stripe pattern and arranged in a direction perpendicular to each other.

The electron emission source 24 is formed to be electrically connected to the cathode electrode 20 at each intersection of the gate electrode 22 and the cathode electrode 20.

The electron emission source 24 is formed using a carbon-based material that emits electrons well under low voltage driving conditions of about 10 to 100V. The carbon-based material forming the electron emission source 24 is selected from graphite, diamond, diamond like carbon (DLC), carbon nanotube (CNT), and C ₆₀ (fulleren). It can be used individually or in combination of 2 or more types. In particular, carbon nanotubes are known to be ideal electron emission sources because the radius of curvature of the ends is extremely fine, such as several to several tens of nm, and emits electrons well even at low electric fields of about 1 to 10 V / µm.

The electron emission source 24 may be formed in various shapes, such as a cylindrical shape, a cone shape, a wedge shape, and a thin film edge type.

In addition, red, green, and blue fluorescent layers 26 may be formed at random intervals on one surface of the second substrate 12, and a black matrix may be further formed between the fluorescent layers to improve contrast of the screen. An anode electrode 28 made of a metal thin film (typically an aluminium thin film) is formed on the fluorescent layer 26 and the black matrix, and the anode electrode 28 made of metal foil has a high voltage necessary for accelerating the electron beam from the outside. In addition to the authorized functions, it helps to secure the withstand voltage of the display device and to improve luminance.

On the other hand, a transparent electrode such as indium tin oxide (ITO) may be formed on the bottom surface of the fluorescent layer and the black matrix, that is, one surface of the second substrate facing the vacuum container. The transparent electrode may be formed while covering the entire surface of the second substrate or may be formed in a stripe pattern. In this case, the above-described metal thin film may be omitted, and the transparent electrode becomes an anode to receive a voltage required for electron beam acceleration.

Although not shown in the drawings, spacers are arranged at predetermined intervals between the first substrate and the second substrate in order to maintain a constant cell gap d, which is a gap between the first substrate 10 and the second substrate 12. The first substrate 10 and the second substrate 12 may be installed to increase the focusing performance of the electron beam emitted from the electron emission source 24 and the electric field of the anode electrode 28 may be a gate electrode. It is also possible to provide a focusing electrode or a mesh-shaped grid plate in which a plurality of beam through holes are formed in order to prevent the influence on the side 22 and the cathode electrode 21.

Another embodiment of the flat panel display according to the present invention, as shown in Figs. 6 and 7, respectively, on both sides of the glass rod 14 in contact with the first substrate 10 and the second substrate 12, respectively. The sealing groove 15 is formed.

The sealing groove 15 may be selectively formed on any one surface of the first substrate 10 or the second substrate 12 in contact with the sealing groove 15.

The sealing groove 15 may be formed to have the same size as the sealing grooves 11 and 13 of the first and second substrates 10 and 12, and the sealing grooves 11 and 13 It is also possible to form larger or smaller than).

In the above-described other embodiments, the shape and configuration of the sealing groove 15 may be implemented in the same manner as the shape and configuration of the sealing grooves 11 and 13 of the above-described embodiment, and thus detailed description thereof will be omitted.

If the sealing groove 15 is also formed in the glass rod 14 as described above, since the contact area with the frit 16 is increased, the sealing force is greatly improved compared to the above-described embodiment.

In the above, the width and / or depth of the sealing groove 15 is set within the range allowed by the strength and mechanical processing of the glass rod 14.

When the sealing groove 15 is also formed in the glass rod 14 as described above, the amount of frit 16 to be applied is set in consideration of this.

In the above, the application of the flat panel display device according to the present invention to the field emission display device (FED) has been described as an example. However, the present invention is not limited thereto, and the plasma display panel (PDP), the fluorescent display tube (VFD), It can also be applied to a liquid crystal display (LCD) or the like.

In an embodiment of the method of manufacturing a flat panel display according to the present invention, as shown in FIG. 8, the sealing grooves 11 and (A) are formed at corresponding positions along the edges of the first and second substrates 10 and 12. 13 is formed (P10), the frit 16 is applied to both sides of the glass rod 14 (P20), and the frit 16 coated with the glass rod 14 is a sealing groove 11, ( 13 is disposed between the first substrate 10 and the second substrate 12 so as to be positioned (P30), and the frit 16 is melted and filled in the sealing grooves 11 and 13 so as to be located in the glass. It includes a process of firing (P40) at a predetermined temperature so that the rod 14, the first substrate 10 and the second substrate 12 is sealed to each other.

In the step of applying the frit 16 (P20), the frit 16 is applied to the glass rod 14, but the frit 16 is applied to the first substrate 10 and the second substrate 12. It is also possible to apply to the sealing grooves 11 and 13.

In the case where the frit 16 is applied to the sealing grooves 11 and 13, the width of the applied frit 16 is not greater than the width of the sealing grooves 11 and 13, and the first substrate ( 10) and it is preferable to apply so as to protrude slightly than the surface of the second substrate 12. That is, it is preferable to adjust the amount of the applied frit 16 so that the applied frit 16 is melted in the firing step P40 and filled only in the sealing grooves 11 and 13, and the melted frit 16 ) Is preferably applied so as to project more than the sealing grooves 11 and 13 so as to sufficiently contact the glass rod 14.                     

When the frit 16 is applied as described above and fired at a predetermined temperature, the applied frit 16 melts to fill the sealing grooves 11 and 13, and the glass rod 14 and the first substrate ( 10) and sealing between the second substrate 12 is made. Therefore, the frit 16 is located only in the sealing grooves 11 and 13, and does not flow out to the contact surface between the glass rod 14 and the first substrate 10 and the second substrate 12. .

In the above description of the preferred embodiment of the flat panel display device and the manufacturing method thereof according to the present invention, the present invention is not limited thereto, and various modifications are made within the scope of the claims and the detailed description of the invention and the accompanying drawings. It is possible to implement, and this also belongs to the scope of the present invention.

According to the flat panel display and the manufacturing method according to the present invention made as described above, since the frit is filled in the sealing groove and does not spread out of the sealing groove, there is no change in height due to the frit, and only by the height (thickness) of the glass rod. The cell gap is maintained and it is possible to precisely set the cell gap and to maintain a constant quality.

In addition, according to the flat panel display device according to the present invention, since a sufficient amount of frit is used to fill the sealing groove, it is possible to ensure a thick thickness of the frit used for sealing, and the risk of generating a vacuum leak is greatly reduced.

In addition, according to the flat panel display and the manufacturing method thereof according to the present invention, since the cell gap is maintained by the glass rod and both substrates are supported, it is possible to apply even when the cell gap is large, and the assembly process and alignment are very easy and simple. It is done.

Claims (6)

A first substrate and a second substrate disposed at predetermined intervals and having sealing grooves respectively formed at positions corresponding to edges thereof; A glass rod having a thickness corresponding to a cell gap and disposed along edges of the first and second substrates between the first and second substrates; And A frit filling the sealing groove of the first substrate and the sealing groove of the second substrate, respectively, and sealing the glass rod, the first substrate, and the second substrate to each other. Flat display device comprising a. The method according to claim 1, And a sealing groove corresponding to the sealing groove of the first substrate or the sealing groove of the second substrate is formed on at least one surface of the glass rod in contact with the first substrate and the second substrate. The method according to claim 1 or 2, The sealing groove of the first substrate and the sealing groove of the second substrate are formed to have a cross-sectional shape of any one of a triangle, a quadrangle, a semicircle, a semi-ellipse, and a trapezoidal shape. The method according to claim 1 or 2, And the sealing groove of the first substrate and the sealing groove of the second substrate are formed in one row or two rows or more. delete delete

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