KR20070053872A - Image display device - Google Patents

Abstract

The present invention relates to an image display apparatus which forms a stable vacuum container without embedding a spacer and has a structure that is advantageous for explosion protection. An image display apparatus according to the present invention forms a first region together with a first substrate and a first substrate, and forms a second region together with the first substrate and a second region positioned in front of the first substrate. And a vacuum container including a reinforcing member positioned rearward, an electron emission unit provided on one surface of the first substrate, and a light emitting unit provided on one surface of the second substrate. The first substrate forms at least one through hole for communicating the first region and the second region with each other in the vacuum chamber, and the reinforcing member is substantially flat, forming recesses and sidewalls on opposite surfaces of the first substrate. It is formed to have an appearance.

Electron emission unit, fluorescent layer, display device, vacuum structure, reinforcing board, sealing member, frit

Description

Image display {IMAGE DISPLAY DEVICE}

1 is a partially exploded perspective view of an image display device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an image display device according to an exemplary embodiment of the present invention, which shows a cross section taken along the line I-I of FIG. 1.

3 is a cross-sectional view of an image display device showing a modification of the second substrate.

4 is a plan view of the reinforcing member shown in FIG. 1.

5 is a perspective view showing a modification of the reinforcing member.

FIG. 6 is a cross-sectional view taken along the line II-II of FIG. 5.

FIG. 7 is a partially exploded perspective view illustrating a first substrate and a second substrate when the image display device according to an exemplary embodiment is applied to a field emission array type electron emission display device.

8 is a partial cross-sectional view of a first substrate and a second substrate showing a case where an image display device according to an embodiment of the present invention is applied to a field emission array type electron emission display device.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device, and more particularly, to an image display device having a vacuum container capable of maintaining an area where an electron emission portion is located at a uniform interval without embedding a spacer.

An image display apparatus using electrons for emitting a fluorescent layer typically has a basic configuration of a vacuum container having an electron emitting portion and a fluorescent layer therein, and excites a fluorescent layer with electrons emitted from the electron emitting portion to emit a predetermined light. Or it acts as a marker.

Such image display apparatuses may be classified into a method using a hot cathode and a cold cathode according to the type of electron source. Depending on the shape of the vacuum vessel, a bulb-type vessel such as a cathode ray tube (CRT) is used, and a front substrate and a rear side such as a fluorescent display tube (VFD) and a field emitter array (FEA) type electron emission display apparatus. It can be classified in such a manner as to use a flat container made of a substrate and a sealing member.

In the image display apparatus using the flat plate container, as the screen size increases and the internal vacuum degree increases, the compressive force applied to the vacuum container increases. Therefore, a structure that suppresses deformation and breakage of the vacuum container by providing a plurality of spacers inside the vacuum container has been proposed and used. In this case, the spacers are positioned corresponding to the black layers between the fluorescent layers so as not to invade the fluorescent layers.

In recent years, as the image display device becomes higher resolution, the width of the black layer on which the spacer is to be located becomes narrower. Accordingly, a spacer having a fine size and a high aspect ratio is required. However, spacers satisfying this condition are not only easy to manufacture, but also have difficulty in attaching thousands of micro spacers onto a front substrate or a rear substrate.

In addition, the conventional image display apparatus may not increase the initial vacuum degree due to the spacers, and a bad mounting of the spacer may occur in the exhaust process. If the image display device cannot initially secure a high vacuum, the vacuum degree gradually decreases due to the outgassing of the members provided inside the vacuum container, and thus the display characteristics are degraded, and the poorly mounted spacers block the electron beam path and degrade the screen quality. Let's do it.

Furthermore, a spacer made of a dielectric such as glass or ceramic may have the surface charged to a positive or negative potential as electrons strike the surface when the display device is acting. The charged spacer distorts the electron beam path, such as by drawing or pushing out electrons passing through the surrounding, thereby degrading display quality.

As described above, the spacer is an effective member for securing the stability of the flat plate type vacuum container, but reduces the productivity of the image display device and acts as a deterrent to improving the screen quality.

Accordingly, an object of the present invention is to solve the above problems, and an object of the present invention is to provide an image display apparatus which can form a stable vacuum container without a built-in spacer and increase the initial vacuum degree to compensate for the deterioration of vacuum degree due to outgassing. It is.

In order to achieve the above object, the present invention,

A first substrate, a second substrate forming a first region together with the first substrate and positioned in front of the first substrate, and a reinforcing member forming a second region together with the first substrate and positioned behind the first substrate. A vacuum container, an electron emission unit provided on one surface of the first substrate, and a light emitting unit provided on one surface of the second substrate, wherein the first substrate communicates with the first region and the second region within the vacuum container. To provide at least one through hole, and the reinforcing member to form a concave portion and a side wall on an opposite surface with the first substrate, and to have a substantially flat appearance.

The side wall may be formed to occupy approximately 50 to 90% of the area of the facing surface of the reinforcing member with the first substrate.

The side wall may have a variable width along the edge of the reinforcing member. For example, the side wall may have a maximum width at the center of the long side and the short side of the reinforcing member, and may have a minimum width at the diagonal corner of the reinforcing member.

The through hole of the first substrate may be positioned to correspond to the side wall of the reinforcing member, and the communication hole extends from the point corresponding to the through hole to the recess.

The side wall may form a dividing groove for dividing the side wall into two or more portions along a direction away from the central portion of the reinforcing member. Also, the outermost sidewall portion among the sidewall portions divided by the dividing groove has a closed curve shape along the edge of the reinforcing member.

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

1 is an exploded perspective view of an image display device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the image display device according to an embodiment of the present invention showing a cross section taken along line I-I of FIG. 1.

1 and 2, the image display device includes a first substrate 10 and a second substrate 12 disposed opposite to each other with the first region 100 interposed therebetween, and behind the first substrate 10. And a vacuum container 2 made of a reinforcing member 14 attached to form a second region 200 with the first substrate 10. The first region 100 and the second region 200 mean an area divided by the first substrate 10 in the vacuum container 2, and the first substrate 10 may be formed of the first region 100 and the first region 100. Through-holes 16 are formed to allow the second region 200 to communicate with each other.

More specifically, an electron emission unit 18 for emitting electrons toward the second substrate 12 is provided on the opposite surface of the first substrate 10 to the second substrate 12, and the second substrate 12 is provided. The light emitting unit 20 that emits visible light by electrons is provided on an opposite surface of the first substrate 10. As a result, the first substrate 10 functions as a cathode substrate together with the electron emission unit 18, and the second substrate 12 functions as an anode substrate together with the light emitting unit 20.

At the edges of the first substrate 10 and the second substrate 12, a support frame 24 for maintaining a constant distance between the two substrates is positioned. Among the support frames 24, the first substrate 10 and the second substrate ( The first adhesive layer 26 is positioned on the side opposite to the 12, and the first substrate 10, the support frame 24, and the second substrate 12 are integrally bonded to each other.

As a result, a first region 100 surrounded by the first substrate 10, the second substrate 12, and the support frame 24 is formed, and according to the height of the support frame 24, the first substrate 10 and the second substrate 100 are formed. The spacing of the substrates 12 is determined. In this case, the support frame 24 may be made of the same material as the first substrate 10 and the second substrate 12 or may be made of a material having a thermal expansion coefficient similar to that of the two substrates.

On the other hand, as shown in FIG. 3, the second substrate 12 ′ may integrally form sidewalls 28 extending toward the first substrate 10 along its edge. That is, the second substrate 12 ′ may be formed of a flat plate portion 30 positioned in parallel with the first substrate 10 and a side wall 28 positioned at an edge of the flat plate portion 30. A first adhesive layer 26 is provided between the side wall 28 and the first substrate 10 to bond the first substrate 10 and the second substrate 12 'to each other.

Here, the flat plate portion 30 of the second substrate 12 or the second substrate 12 'is preferably formed to a sufficient thickness to withstand the vacuum compression force, for example, a thickness of 10 mm or more. On the other hand, since the vacuum compressive force is not applied to the first substrate 10 positioned across the inside of the vacuum container 2, the first substrate 10 is formed to have a thickness smaller than that of the second substrate 12, for example, 5 mm or less. It may be.

The first substrate 10 is a substrate in which various electrodes for controlling on / off of electron emission, electron emission amount, and electron beam path are provided together with an electron emission part, and an insulating layer for insulating between the electron emission part and the electrodes and the electrodes. In the process of forming a plurality of high temperature heat treatment process is performed. At this time, the first substrate 10 having a thickness of 5 mm or less as described above has a small thermal stress in spite of a sudden temperature change, thereby preventing cracking, and advantageously increasing the film forming characteristics of the electron emission unit 18. Works.

The reinforcing member 14, which forms the outer shape of the vacuum container 2 in place of the first substrate 10, forms a concave portion 32 on the opposite surface to the first substrate 10 to form the first substrate 10. A second area 200 surrounded by the reinforcing member 14 is provided. When the portion of the reinforcing member 14 that faces the first substrate 10 except for the concave portion 32 is referred to as the side wall 34, the entire surface of the side wall 34 facing the first substrate 10 may be formed. Alternatively, a portion of the second adhesive layer 36 is provided to bond the first substrate 10 and the reinforcing member 14 to each other.

The reinforcing member 14 may be formed to have a thickness greater than that of the first substrate 10 in consideration of the vacuum compression force, and may be, for example, the same thickness as that of the second substrate 12. The reinforcing member 14 includes an exhaust port 38 and an exhaust pipe 40 used to exhaust the inside of the container, and a getter (not shown) for adsorbing residual gas after exhaust to increase the degree of vacuum. The exhaust port 38 and the exhaust pipe 40 may be located at the center of the reinforcing member 14, for example.

More specifically, the side wall 34 has a width larger than that of the support frame 24 positioned between the first substrate 10 and the second substrate 12, and the first substrate 10 of the reinforcing members 14 may be formed. Assuming the opposite surface area of is 100, the side wall 34 may be formed to occupy approximately 50 to 90% of the opposite surface area. And the depth of the recessed part 32 is formed so that the reinforcement member 14 can maintain thickness larger than the 1st board | substrate 10. FIG.

In addition, the side wall 34 has a maximum width in the center of the long side and the short side of which the relatively large stress is applied in consideration of the stress distribution applied to the reinforcing member 14, and at the diagonal corner portion of which the relatively small stress is applied. It is formed to have a minimum width. For this reason, the application area of the second adhesive layer 36 may be changed along the edge of the reinforcing member 14 to reduce the stress difference for each position of the reinforcing member 14.

In particular, the side wall 34 has a width that gradually decreases toward the diagonal corner at the center of the long side and the short side of the reinforcing member 14. Such a gentle width change serves to suppress a sudden change in strength along the edges of the first substrate 10 and the reinforcing member 14 to make the stress distribution of the first substrate 10 and the reinforcing member 14 uniform. .

FIG. 4 is a plan view of the reinforcing member shown in FIG. 1. Referring to FIG. 4, the width W1 of the sidewall 34 measured at the center of the short side of the reinforcing member 14 is defined as the length of the long side of the reinforcing member 14. It may be approximately 0.2 to 0.4 times L1, and the width W2 of the side wall 34 measured at the center of the long side of the reinforcing member 14 is also about 0.2 to 0.4 of the length of the short side of the reinforcing member 14. It can be done by ship.

When the side wall 34 satisfies the area ratio of the reinforcing member 14 on the opposite surface of the reinforcing member 14 to the first substrate 10 and the above-described width condition, while ensuring the volume of the second region 200 required for the spacer removal. The bonding area between the first substrate 10 can be enlarged, and the bonding force between the first substrate 10 and the reinforcing member 14 can be maintained excellent.

On the other hand, the through hole 16 is located in the first substrate 10 outside the electron emission unit 18, for example, at the diagonal corner of the first substrate 10, and the through holes 16 are the reinforcement described above. The shape of the sidewalls 34 of the member 14 is positioned corresponding to the sidewalls 34 rather than the recesses 32. In the present embodiment, the side wall 34 of the reinforcing member 14 forms a communication groove 42 extending from the point corresponding to the through hole 16 toward the recess 32, and communicates with the through hole 16. The first region 100 and the second region 200 communicate with each other through the groove 42.

As described above, the vacuum chamber 2 according to the present exemplary embodiment forms the second region 200 communicating with the first region 100 behind the first substrate 10 to enlarge the internal volume. The gap between the first substrate 10 and the second substrate 12 may be maintained at a constant level without providing a spacer in the 100, thereby ensuring a stable structure. In addition, the vacuum vessel 2 may increase the initial vacuum degree by the enlarged internal volume, and compensate for the decrease in the vacuum degree due to the outgassing, thereby ensuring excellent product characteristics.

In addition, in this embodiment, the reinforcing member 14 basically maintains the shape of the flat plate, thereby minimizing the phenomenon that the glass fragments are blown out of the vacuum container 2 when an external impact is applied to the vacuum container 2 and breakage occurs. This can reduce user damage due to glass fragments. In addition, the thickness of the vacuum container 2 is reduced, which is advantageous in thinning, and the bonding force between the first substrate 10 and the reinforcing member 14 can be increased.

In this case, the second region 200 may be formed in a smaller volume than the first region 100, and the second region 200 may be larger than the first region 100 by adjusting the width and depth of the recess 32. It can also form by volume.

5 is a perspective view showing a modification of the reinforcing member, and FIG. 6 is a cross-sectional view taken along the line II-II of FIG. 5.

Referring to the drawings, the side wall 34 'of the reinforcing member 14', along with the aforementioned communication groove 42 on the opposite surface to the first substrate 10, faces away from the center of the reinforcing member 14 '. Accordingly, the dividing groove 44 for dividing the side wall 34 'into two or more portions is formed.

As an example, as shown in the figure, a pair of split grooves 44 are formed in the long side portion of the reinforcing member 14 in parallel with the long side portion to divide the side wall 34 'positioned at the long side portion into three parts. Also, a pair of dividing grooves 44 may be formed at the short side of the reinforcing member 14 'in parallel with the short side to divide the side wall 34' positioned at the short side into three parts. have.

At this time, the first side wall 46, the second side wall 48, and the third side wall are sequentially disposed from the portion of the side wall 34 'divided by the dividing groove 44 from the portion located at the outermost portion of the reinforcing member 14'. Named 50, each frit layer 36 is positioned on the upper surfaces of the first to third sidewalls 46, 48, and 50, that is, on the opposite side to the first substrate 10, and the first sidewalls 46 are formed. ) Is formed to have a continuous closed curve shape along the edge of the reinforcing member 14 'to prevent vacuum leakage.

The dividing grooves 44 facilitate the discharge of the gas discharged from the second adhesive layer 36 during plastic sealing using the second adhesive layer 36, thereby effectively contributing to ensuring a high vacuum in the vacuum container. In the above configuration, the second sidewall 48 and the third sidewall 50 may be formed at a height lower than that of the first sidewall 46 as shown in FIG. 6. In this case, the first sidewall 46 may be tightly coupled to the first substrate 10 without a gap to more effectively prevent vacuum leakage.

The above-described vacuum vessel is an image display device using a cold cathode as an electron source, for example, a field emitter array (FEA) type or a surface-conduction emission (SCE) type electron. Suitable for emission display devices. A case where the above-described image display device is applied to an FEA type electron emission display device will be briefly described with reference to FIGS. 7 and 8.

Referring to FIGS. 7 and 8, the electron emission unit 52 provided on the first substrate 10 may include cathode electrodes 54 and gate electrodes 56, which are driving electrodes, and cathode electrodes 54. A first insulating layer 58 positioned between the gate electrodes 56 to insulate the two electrodes, electron emission portions 60 electrically connected to the cathode electrodes 54, and upper portions of the gate electrodes 56. And a second insulating layer 64 positioned between the gate electrodes 56 and the focusing electrode 62 to insulate the two electrodes.

The first insulating layer 58 and the gate electrodes 56 form openings 581 and 561 corresponding to the electron emission portions 60 and expose the openings 581 and 561, and the second insulating layer 64 and the focusing electrode 62. ) May form one opening 641 and 621 at each intersection region of the cathode electrode 54 and the gate electrode 56.

The electron emission unit 60 may be made of materials that emit electrons when an electric field is applied in a vacuum, such as a carbon-based material or a nanometer-sized material. The electron emission unit 60 may include, for example, carbon nanotubes, graphite, graphite nanofibers, diamonds, diamond-like carbons, C ₆₀ , silicon nanowires, and combinations thereof. On the other hand, the electron emission unit may be formed of a tip structure having a pointed tip mainly made of molybdenum (Mo) or silicon (Si).

The light emitting unit 66 provided on the second substrate 12 is positioned between the red, green, and blue fluorescent layers 68R, 68G, and 68B, and each of the fluorescent layers 68 to increase the contrast of the screen. A layer 70 and an anode electrode 72 formed on the fluorescent layer 68 and the black layer 70 are included. The anode electrode 72 may be formed of a metal film, such as aluminum, and reflects the visible light emitted toward the first substrate 10 among the visible light emitted from the fluorescent layer 68 to the second substrate 12 to display the brightness of the screen. Increase

The image display device having the above-described configuration is driven by supplying a predetermined voltage to the cathode electrodes 54, the gate electrodes 56, the focusing electrode 62, and the anode electrode 72 from the outside.

For example, any one of the cathode electrodes 54 and the gate electrodes 56 receives a scan driving voltage to serve as scan electrodes, and the other electrodes receive a data driving voltage to serve as data electrodes. The focusing electrode 62 receives a voltage required for electron beam focusing, for example, 0 V or a negative DC voltage of several to several tens of volts, and the anode electrode 72 is required for accelerating the electron beam, for example, several hundred to several thousand volts. DC voltage of is applied.

As a result, an electric field is formed around the electron emission unit 60 in the pixels in which the voltage difference between the cathode electrode 54 and the gate electrode 56 is greater than or equal to the threshold, and electrons are emitted therefrom. The emitted electrons are focused to the center of the electron beam bundle while passing through the opening 621 of the focusing electrode 62, and are attracted by the high voltage applied to the anode electrode 72 to impinge on the fluorescent layer 68 of the corresponding pixel to emit light. Let's do it.

In the above, the field emission array (FEA) type electron emission display device has been described as an example of the image display device. However, the present invention is not limited to the FEA type electron emission display device. It is also easily applicable to the device.

In addition, although the preferred embodiment of the present invention has been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it is within the scope of the present invention.

As described above, the image display apparatus according to the present invention can reduce the vacuum stress by strengthening the bonding force between the first substrate and the reinforcing member by the above-described reinforcing member shape, and can effectively reduce the weight of the reinforcing member and the overall length of the vacuum container. In addition, the image display device according to the present invention has a structure that is advantageous in explosion prevention by reducing the internal volume of the vacuum container.

Claims (13)

A first substrate, a second substrate forming a first region together with the first substrate, and positioned in front of the first substrate; and a reinforcing member disposed behind the first substrate, forming a second region together with the first substrate. A vacuum container comprising a; An electron emission unit provided on one surface of the first substrate; And A light emitting unit provided on one surface of the second substrate, The first substrate forms at least one through hole in the vacuum container to communicate the first region and the second region with each other, And the reinforcing member has a substantially flat appearance while forming recesses and sidewalls on the opposing surface of the first substrate. The method of claim 1, And the side wall is formed so as to occupy approximately 50 to 90% of the area of the facing surface of the reinforcing member with the first substrate. The method of claim 1, And a sidewall having a width varying along an edge of the reinforcing member. The method of claim 3, And the side wall has a maximum width at the center of the long side and short side of the reinforcing member, and has a minimum width at the diagonal corners of the reinforcing member. The method of claim 4, wherein And a width of the side wall measured at the center of the short side and the long side of the reinforcing member is 0.2 to 0.4 times the length of the long side and the short side of the reinforcing member, respectively. The method of claim 1, The through hole of the first substrate is located corresponding to the side wall of the reinforcing member, And a communication groove extending from the point corresponding to the through hole toward the recess. The method of claim 1, And a dividing groove for dividing the sidewall into two or more portions in a direction away from the central portion of the reinforcing member. The method of claim 7, wherein And the division grooves are located in parallel with the long side and the short side at the long side and the short side of the reinforcing member, respectively. The method of claim 7, wherein And an outermost sidewall portion of the sidewall portions divided by the division grooves having a closed curve along an edge of the reinforcing member. The method of claim 9, And the remaining sidewall portions except for the outermost sidewall portion have a lower height than the outermost sidewall portion. The method of claim 1, And a support frame positioned between the first substrate and the second substrate, wherein the sidewall of the reinforcing member has a width larger than that of the support frame. The method of claim 1, And the second substrate and the reinforcing member have a thickness greater than that of the first substrate. The method of claim 1, And the electron emission unit includes electron emission portions made of a cold cathode electron source.

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