KR20020057618A - The FED equipped jutted black matrix and the manufacturing method - Google Patents

Abstract

PURPOSE: A field emission display device having a projected black matrix and a manufacturing method thereof are provided to decrease the arcing problem by forming the projected black matrix every a sub-pixel and a pixel of a fluorescent material. CONSTITUTION: A black matrix(102) isolates different colored fluorescent materials(101) on an anode substrate(100). A projected black matrix(104) surrounds the fluorescent materials(101) and is project-formed on the black matrix(102). A metal back(103) is formed on the projected black matrix(104). The projected black matrix(104) is formed on a place higher than that of the fluorescent materials(101). Spacers(120) are formed every interval of the projected black matrix(104). The projected black matrix(104) is separately formed on every sub-pixel of the fluorescent material(101).

Description

Field emission-type display device with protruding black matrix and its manufacturing method {The FED equipped jutted black matrix and the manufacturing method}

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to the field of black matrices of field emission display devices, and in particular, to solve the arcing problem by forming a protruding black matrix separated by a sub-pixel and a pixel of a phosphor using a plating process on a black matrix layer on a screen. The present invention relates to a field emission display device having a protruding black matrix which can be used as a gripper for attaching spacers of various shapes and to reduce the problem of film lift-up against thermal stress caused by a thick film process.

A field emission display device is a display device in which electrons are emitted by a tunneling effect by an electric field applied to an emitter end, and light is generated when the electrons collide with a phosphor on a screen.

The top plate of the field emission display device includes a black matrix (BM) for improving contrast, a phosphor of red, green, and blue, and a metal back for reflecting light scattered backwards to increase brightness. In addition, spacers for preventing damage to the panel due to atmospheric pressure while maintaining a constant distance between the anode substrate and the cathode substrate support the two substrates. In this case, the spacer may be formed by fusing the frit glass at a high temperature to bond the spacer, bonding the spacer using electrostatic bonding, and sandwiching the spacer between the upper and lower plates.

Among the elements constituting the anode substrate, the black matrix is a non-luminescent absorbing material employed between the phosphors in order to cope with color bleeding caused by the emission of electrons emitted from the electron gun in the cathode ray tube due to the failure of accurate arrival to the corresponding phosphor. It is a layer with a rectangular cross section made of phosphorus graphite.

In Korean Patent Publication 95-3647, the arrival margin of this type of black matrix collides with the inclined surface to excite the fluorescent film to improve the luminance of light emitted. However, such a planar black matrix has a disadvantage in that it is difficult to completely block other color emission caused by backscattered electrons or secondary electrons.

In order to solve this problem, U.S. Patent No. 5,477,105 proposed a structure of a light emitting device having a black matrix, which is used for an optical device such as a planar cathode ray tube. In order to increase contrast and color purity, an area that does not emit light even by collision of electrons to the plasma display device is proposed. The barrier rib used was formed around the light emitting unit, and metal, ceramic, semiconductor, carbon compound, etc. were proposed as the light absorbing material.

U.S. Patent 5,725,787 proposes four methods for forming the top plate.

First, frit glass and a photoresist, which is a photosensitive material, are applied, and only the light emitting part is exposed and etched to form a phosphor. Second, after the metal is deposited, the barrier rib is formed only on the necessary portion by plating, and then phosphor is coated. Third, after masking with a sand blast mask, the light emitting region is scraped off by sand blasting to form a partition wall, and then phosphor is coated.

Fourth, phosphors are coated after the metal and photoresist are formed by sandblasting using a sandblast mask.

U.S. Patent 5,818,162 proposes a multilayer conductive black matrix.

Conventional conductive graphite-based black matrices are low in height, making it difficult to prevent arcing in sub-pixel areas, and high-height polyamide-based black matrices are electrically insulating and do not prevent backscattering of electrons. A matrix was formed to effectively separate neighboring sub-pixels, reducing arcing between emitters and sub-pixels.

In the multilayer conductive black matrix structure, a photoresist is applied to the upper plate, a protrusion structure is formed through exposure and development processes, and then a dag is sprayed on the conductive material to apply a conductive material, and then the photoresist is removed to remove the protrusion black matrix structure. Will form. In this structure, the row spacing is smaller than the spacing so that the injected conductive material has a higher height due to capillary action.

US Pat. No. 5,858,619 forms a conductive black matrix with sufficient height to effectively separate adjacent sub-pixels to reduce arcing.

After applying a photo-imageable material to the front surface and developing in the heat direction, the empty ball is filled with a conductive material to form a column in the heat direction. The black matrix fabricated by etching the remaining photo-imageable material on the substrate and then applying the photo-imageable material on the front surface and etching in the row direction to form an empty space, and filling the conductive material there to form a column in the row direction again. Proposed structure.

U.S. Patent 5,542,683 proposes a front substrate of a field emission display device having a wall-gripper structure.

That is, in the field emission display device employing the spacer, a structure is proposed in which the spacer is positioned in the black matrix layer so that the spacer is not visible and the misalignment does not occur even in a high temperature bonding or sealing process.

The black matrix lattice is formed in the transverse and longitudinal directions on the front substrate, respectively, and at least one wall-gripper is formed on the transverse and longitudinal black matrix layers to form a trench supporting the spacer. In addition, an alignment mark for optically arranging was formed on the front substrate so that the array could be optically arranged without an additional device.

U.S. Patent 5,912,056 proposed a black matrix with a conductive coating. After forming a polyamide-based insulating black matrix having a height of 20 to 40 µm, a photoresist, a photosensitive material, was coated on the front surface and UV light was emitted from the rear surface. After irradiating and developing the photoresist on the black matrix side, a conductive material such as aluminum (Al) is applied to the entire surface. Subsequently, the photoresist on the sub-pixel side may be etched to form a structure in which the conductive material is applied only to the black matrix.

WO 97/19460 proposes a flat panel display device having reduced electron scattering effect, in which accelerated electrons excite the surrounding phosphors to reduce color purity, and backscattered electrons also collide with surrounding phosphors or accumulate in spacers. Since the anti-scatter film protrudes in the black matrix area of the top plate, the scattered electrons are prevented from going out of the phosphor sub-pixel. To this end, the anti-scattering film 20 ~ 200㎛ higher than the thickness of the phosphor used for this material includes polyamide, glass, ceramic, metal and the like.

WO98 / 49708 proposes a top plate manufacturing method using a sacrificial layer and backside exposure. In order to produce a black matrix to increase the image contrast, a black matrix layer having a high height is fabricated using the back exposure method to increase the probability of scattered electrons from the phosphor colliding with the black matrix, thereby preventing collision with neighboring phosphors. The black matrix layer in the matrix direction was increased and the mounting stability of the spacer was improved by preventing the side movement when the spacer was mounted on the black matrix part.

When the black matrix is formed by front exposure, the exposure depth is changed due to the nonuniformity of the polyimide coating thickness, thereby decreasing the bonding strength between the polyamide and the substrate, making it difficult to manufacture the protruding black matrix and the gripping characteristics of the spacer wall. As this becomes worse, the mounting stability of the protruding black matrix and the spacer is achieved by using a combination of technologies such as polyamide with negative photosensitive properties, back exposure, using a sacrificial layer mask, double polyimide layer, and forming a black matrix by thermal coloring of polyamide. Raised.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, by using a plating process on the black matrix layer on the screen to form a protruding black matrix separated by sub-pixels and pixels of the phosphor to solve the arcing problem and thick film process It is an object of the present invention to provide a field emission display device having a protruding black matrix which can be used as a gripper for attaching spacers of various shapes and to reduce the problem of film liftup due to thermal stress.

1 is a view showing a field emission display device having a protruding black matrix according to the present invention.

2 is a plan view of an anode substrate of a field emission display device having a protruding black matrix according to the present invention.

3 is a view showing an embodiment in which the protruding black matrix of the anode substrate grips the spacer in the field emission display device having the protruding black matrix according to the present invention.

4 is a view showing an embodiment in which a spacer is gripped by forming a protruding black matrix of an anode substrate in a U-shaped or U-shaped in a field emission display device having a protruding black matrix according to the present invention.

5 is a diagram showing a protruding black matrix with legs formed in a field emission display device having a protruding black matrix according to the present invention.

6 shows a three-dimensional form of the projecting black matrix in the field emission display device having the projecting black matrix according to the present invention.

7 is a view showing a method of manufacturing a field emission display device having a protruding black matrix according to the present invention.

Explanation of symbols on the main parts of the drawings

100: anode substrate 101: phosphor

102: Black matrix 103: Metal back

104: protruding black matrix 110: cathode substrate

111: emitter 120: spacer

In order to achieve the above object, a field emission display device having a protruding black matrix and a method of manufacturing the same according to the present invention include: a black matrix for isolating phosphors of different colors on an anode substrate; It surrounds the phosphor, characterized in that it comprises a protruding black matrix formed to protrude on the black matrix.

In this case, a metal back is formed on the protruding black matrix, and the protruding black matrix is formed higher than the phosphor, and a spacer is formed therebetween.

In addition, the protruding black matrix is formed by being separated from each pixel or each pixel of the phosphor and connected to each other.

In addition, in order to achieve the above object, a method of manufacturing a field emission display device having a protruding black matrix according to the present invention includes the steps of: patterning a black matrix on an anode substrate;

Forming a metal seed layer over the patterned black matrix;

Forming a plating template between the black matrices on which the metal seed layer is formed;

Plating a metal on the black matrix on which the metal seed layer is formed to form a protruding black matrix;

Removing the metal seed layer and plating mold;

Forming a phosphor between the black matrix lower than the protruding black matrix;

It characterized in that it comprises a step of forming a metal back on the phosphor and the protruding black matrix.

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

1 is a view showing a field emission display device having a protruding black matrix according to the present invention.

Referring to FIG. 1, the field emission display device having the protruding black matrix according to the present invention is an anode substrate on which a phosphor 101, a black matrix 102, a metal back 103, and a protruding black matrix 104 are formed. 100; A cathode substrate 110 on which an emitter 111 is formed; It consists of a spacer 120 for supporting between the two substrates in order to support the atmospheric pressure outside the two substrates.

When the electric field is formed on the emitter 111 of the cathode substrate and electrons are emitted to excite the phosphor 101, the remaining electrons and secondary electrons in the phosphor are prevented from backscattering by the protruding black matrix 104. .

The protruding black matrix 104 may have a thickness of 5-10 μm or more from the phosphor 101 to exhibit sufficient anti-scattering effect.

2 is a plan view of an anode substrate of a field emission display device having a protruding black matrix according to the present invention.

Referring to FIG. 2, the protruding black matrix 210 is composed of a thick film of 10 μm or more. In the case of the protruding black matrix fabricated in the same form as the lower black matrix 220, the protruding black matrix 210 is weak in the thermal process, so that the lifting phenomenon due to thermal stress is generated. Easy to occur

Therefore, as shown in (a) of FIG. 2, the protruding black matrix 210 is separated and formed for each color (subpixel) of the phosphor 200 or for each pixel as shown in (b) of FIG. The phenomenon can be reduced.

3 is a view showing an embodiment in which the protruding black matrix of the anode substrate grips the spacer in the field emission display device having the protruding black matrix according to the present invention.

Referring to FIG. 3, there is a phosphor 330 between the black matrices 340 and a protruding black matrix 350 surrounds each of the phosphors.

The protruding black matrix grips and fixes the rib type 300, the cross type 310, and the lip type 320 having the cross support.

The spacer is a rib type 300, the cross shape 310, the lip shape 320 having a cross support, etc. are used the most, and various spacers can be attached according to the shape of the protruding black matrix.

FIG. 4 is a view illustrating an embodiment in which a spacer is gripped by forming a protruding black matrix of an anode substrate in a U-shaped or U-shape in a field emission display device having a protruding black matrix according to the present invention.

Referring to Fig. 4, in order to secure the spacer at the attachment position of the spacer 410, it is necessary to widen the pixel phosphor 420 in order to increase the width of the spacer or increase the aperture ratio of the screen, so that there is enough space to form the protruding black matrix. When this is not secured, the protruding black matrix of the U-shaped 421 and the U-shaped 422 may be used instead of the K-shaped.

No matter what type of black matrix is used, the spacer is designed to be sandwiched between the protruding black matrices and tarring invasion in the phosphor by backscattering is prevented by the spacer or the protruding black matrix.

5 is a diagram illustrating a protruding black matrix having legs formed in the field emission display device having the protruding black matrix according to the present invention.

Referring to FIG. 5, there is a phosphor 520 between the black matrices 530, cross-shaped spacers 510 are formed between the phosphors, and a protruding black matrix 540 formed with legs surrounds the phosphor. At the same time, the cross spacers are fixed.

In order for the voltage of the anode substrate to be equally applied to the entire surface of the anode substrate, the voltage drop due to the electrical resistance should be minimized. When voltage is applied through the metal back, but the thick film of the protruding black matrix is used together with the metal back, the electrical reliability is further increased.

6 is a view showing a three-dimensional shape of the projecting black matrix in the field emission display device having the projecting black matrix according to the present invention.

Referring to FIG. 6, it can be seen that the phosphor 620 is formed between the black matrices 610, and the protruding black matrix 630 is surrounded by the square shape around the phosphor.

7 is a view showing a method of manufacturing a field emission display device having a protruding black matrix according to the present invention.

Referring to FIG. 7, first, the black matrix 710 is patterned using a photolithography process on the anode substrate glass 700 as shown in FIG. 7A. In this case, the black matrix material uses a graphite film, which is a non-luminescent absorbing material, or an oxide film colored to increase contrast.

Next, a metal seed layer 720 for forming a plating layer is formed on the patterned black matrix 710 as shown in FIG. As the metal seed layer 720, a material having high electrical conductivity such as copper, aluminum, nickel, or the like may be used.

Next, as shown in FIG. 7C, a plating mold 730 is formed between the black matrices 710, wherein the plating mold 730 is a photoresist for thick film and SU. Etc. can be used.

Next, as shown in FIG. 7D, a protruding black matrix 740 is formed by plating a metal such as nickel.

Next, as shown in FIGS. 7E and 7F, the plating mold 730 and the metal seed layer 720 are removed, and then the phosphor 750 is interposed between the black matrix 710 as shown in FIG. 7G. After patterning by back exposure or general exposure, the metal back 760 is formed as shown in FIG. 7 (h) to complete the anode substrate of the field emission display device having the protruding black matrix.

As described above, the field emission display device having the protruding black matrix according to the present invention, and a method of manufacturing the same, use the plating process on the black matrix layer on the anode substrate to separate the protruding black matrix per sub-pixel and pixel by pixel. By forming a higher than the phosphor to solve the arcing problem, to reduce the problem of the film lifting for the thermal stress by the thick film process can be used as a gripper for attaching the spacer of various shapes.

In addition, since the spacer is formed on the underlayer of the protruding black matrix, the spacer may be formed so as not to appear on the screen, and the electrical resistance may be reduced by forming a bridge so that a uniform anode high voltage is applied to the entire anode substrate.

Claims (8)

A black matrix for isolating phosphors of different colors on the anode substrate, respectively; And a protruding black matrix formed around the phosphor and protruding from the black matrix. 2. The field emission display device of claim 1, wherein a metal back is formed on the protruding black matrix. The field emission display device of claim 1, wherein the protruding black matrix is formed higher than the phosphor. The field emission display device of claim 1, wherein a spacer is formed between the protruding black matrices. The field emission display device of claim 1, wherein the protruding black matrix is formed separately for each subpixel of the phosphor. The field emission display device of claim 1, wherein the protruding black matrix is formed separately for each pixel of the phosphor. 5. The field emission display device of claim 4, wherein the protruding black matrix is connected to each other. Patterning the black matrix on the anode substrate; Forming a metal seed layer over the patterned black matrix; Forming a plating template between the black matrices on which the metal seed layer is formed; Plating a metal on the black matrix on which the metal seed layer is formed to form a protruding black matrix; Removing the metal seed layer and plating mold; Forming a phosphor between the black matrix lower than the protruding black matrix; And forming a metal back on the phosphor and the protruding black matrix.