KR20080036762A - Electron emission display - Google Patents

Abstract

An electron emission display is provided to effectively radiate the heats of active portions without blocking lights by implementing heat radiation members executed patterning on a substrate. An electron emission display includes a first and second substrates(10,12), an electron emission unit(100), an illumination unit(110), and heat radiation members(32,32'). The first and second substrates, which are formed opposite to each other, form a vacuum vessel. The electron emission unit is provided at an inner surface of the first substrate. The illumination unit is provided at an inner surface of the second substrate. The heat radiation members are formed at the other surface of at least one of the first and second substrates.

Description

Electron emission display

1 is a schematic view showing the configuration of a vacuum container for an electron emission display according to an embodiment of the present invention.

2 is a partially exploded perspective view of an electron emission display according to an embodiment of the present invention.

3 is a cross-sectional view taken along line III-III of FIG. 2.

4 and 5 are top plan views illustrating the heat radiation member of the electron emission display according to the exemplary embodiment of the present invention.

TECHNICAL FIELD The present invention relates to an electron emission display, and more particularly, to an electron emission display capable of effectively dissipating heat generated from a panel during a driving process.

In general, an electron emission element may be classified according to a type of electron source by using a hot cathode and a cold cathode.

The electron emission device using the cold cathode may include a field emission array (FEA) type, a surface conduction emission type (SCE) type, a metal insulating layer, a metal insulating layer, and a metal insulating layer. Metal (MIM) type and Metal-Insulator-Semiconductor (MIS) type are known.

Although the detailed structure and the principle of electron emission differ depending on the type, the electron emission devices basically include an electron emission unit and a driving electrode for controlling the electron emission amount of the electron emission unit. The electron emission elements are arranged in an array on the first substrate to constitute the electron emission unit, and the light emitting unit consisting of the fluorescent layer and the anode electrode is disposed on the second substrate to constitute the electron emission display.

At this time, the edges of the first substrate and the second substrate are integrally bonded by the sealing member, and then the inner space is evacuated to a vacuum degree of approximately 10 ^-6 Torr to constitute a vacuum container.

The electron emitting display emits an intended amount of electrons toward the second substrate in units of pixels through the action of the electron emitting unit and the driving electrodes, and excites the fluorescent layer with the electrons to perform a predetermined light emission or display function. In this process, the anode electrode is applied with a high-voltage DC voltage to maintain the fluorescent layer in a high potential state to accelerate the electrons emitted from the electron emission portion to the fluorescent layer.

However, heat is generated during the driving process of the above-described electron emission display, and this heat causes the panel to generate heat, thereby degrading display quality.

Therefore, in the conventional electron emission display, a method of installing a separate cooling fan is used to cool the panel generated by the heat generated during the driving process. However, this approach has limitations such as an increase in the volume of the electron emission display as a whole, noise generation during cooling fan operation, and power consumption increase.

Accordingly, an object of the present invention is to provide an electron emitting display capable of effectively dissipating heat generated in the driving process of an electron emitting display.

According to an aspect of the present invention, there is provided an electron emission display including: a first substrate and a second substrate disposed opposite to each other at a predetermined interval and constituting a vacuum container, and an electron emission unit provided on an inner surface of the first substrate; And a light emitting unit provided on an inner surface of the second substrate, and a heat radiating member formed on the other surface of at least one of the first substrate and the second substrate.

The heat dissipation member is formed on the other surface of the second substrate.

An effective region and an invalid region are formed in the second substrate, a heat radiating member is selectively formed in the effective region, and a heat radiating member is entirely formed in the invalid region.

The heat dissipation member is formed corresponding to the pattern and position of the black layer constituting the light emitting unit.

The heat dissipation member includes at least one material selected from the group consisting of metals such as gold (Au), silver (Ag), copper (Cu), and aluminum (Al).

In addition, the heat dissipation member includes a conductive carbon-based material.

The heat dissipation member has a ductile metal sheet shape.

The end portion of the heat dissipation member extends outside the vacuum vessel and is exposed to the atmosphere. That is, a heat dissipation sheet is attached to at least one end of the heat dissipation member and extends outside the vacuum chamber.

The heat dissipation sheet is made of a flexible material.

The heat dissipation member is formed through a vacuum deposition method or a printing method.

The electron emission unit may be formed on a first electrode on a first substrate, a first electrode formed along one direction of the first substrate, a second electrode formed along a direction crossing the first electrode with an insulating layer therebetween, and a first electrode formed on the first electrode. And an electron emission unit electrically connected to the first electrode.

And a focusing electrode disposed on the first electrode and the second electrode while maintaining insulation from the first electrode and the second electrode.

The electron emission unit is made of at least one material selected from the group consisting of carbon nanotubes, graphite, graphite nanofibers, diamonds, diamond phase carbons, fullerenes (C ₆₀ ), and silicon nanowires.

The light emitting unit includes a fluorescent layer formed on the second substrate and an anode electrode formed on the second substrate while being connected to the fluorescent layer.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

1 is a schematic view showing the configuration of a vacuum container for an electron emission display according to an embodiment of the present invention.

Referring to FIG. 1, an electron emission display includes a first substrate 10 and a second substrate 12 that are disposed to face each other in parallel at predetermined intervals. Sealing members 36 are disposed at the edges of the first substrate 10 and the second substrate 12 to bond the two substrates, and the inner space is evacuated with a vacuum of approximately 10 ⁻⁶ Torr so that the first substrate 10 The second substrate 12 and the sealing member 36 constitute a vacuum container.

  2 is an exploded perspective view of an electron emission display according to an exemplary embodiment of the present invention, and FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2.

2 and 3, an electron emission unit 100 is provided on an inner surface of the first substrate 10 and a light emitting unit 110 is provided on an inner surface of the second substrate 12. In addition, a spacer 34 is disposed between the electron emission unit 100 and the light emitting unit 110 to maintain a gap between the first substrate 10 and the second substrate 12.

In this embodiment, the outer surface of the first substrate 10 and the second substrate 12 on the heat dissipation member 32 for discharging the heat of the electron emitting unit 100 and the light emitting unit 110 to the outside to the outside of the vacuum container during driving , 32 ') are formed respectively. These heat dissipation members 32 and 32 'are formed entirely on the outer surface of the first substrate 10, and are selectively formed on the outer surface of the second substrate 12.

The second substrate 12 may be divided into an effective area where light is actually emitted and an invalid area located outside the effective area, and the heat dissipation member 32 may form a predetermined pattern in the effective area of the second substrate 12. Is formed with. In addition, the heat dissipation member 32 is formed in the non-effective region of the second substrate 12 as a whole.

Here, the heat dissipation member 32 may include a black layer between the fluorescent layers 26 in the effective region of the second substrate 12 so that light emitted from the light emitting unit 110 may pass through and display an image. 28 is formed in a matrix pattern, and is formed as a whole in other regions.

In addition, the heat dissipation members 32 and 32 ′ may be made of a material having a high thermal conductivity so that the heat generated from the light emitting unit 110 and the electron emission unit 100 may be efficiently discharged to the outside of the vacuum container. For example, it may be made of a conductive carbon-based material such as graphite, or may be made of a metal such as aluminum (Al), silver (Ag), copper (Cu), gold (Au), or platinum (Pt), or a combination thereof. .

The heat dissipation members 32 and 32 'are formed on the first substrate 10 and the second substrate 12 through a vacuum deposition method such as sputtering or a printing method using a printing paste. In consideration of heat dissipation efficiency, the heat dissipation members 32 and 32 'preferably have a thickness of 0.1 μm to 1.0 μm when formed into a thin film of sputtering method, and 1.0 μm to 1.0 μm when formed into a thick film of printing method. It is preferable that it is 10.0 micrometers.

In addition, the heat dissipation members 32 and 32 ′ may have a metal film shape made of the above materials, but the present invention is not limited thereto. For example, the heat dissipation member may be in the form of a flexible metal sheet.

On the other hand, as shown in FIG. 1, the heat dissipation members 32 and 32 ′ are exposed to the outside of the vacuum container so that heat generated by the electron emission unit and the light emitting unit during driving is rapidly released into the atmosphere. That is, a heat dissipation sheet 321 is attached to one end of the heat dissipation members 32 and 32 ′, and the heat dissipation sheet 321 is exposed to the outside of the vacuum container.

4 and 5 are partial plan views illustrating a pattern of a heat dissipation member according to an exemplary embodiment of the present invention.

4 and 5, the heat dissipation member 32 may be formed in a mesh shape in which a plurality of heat dissipation members 32 are arranged in the direction crossing each other, or may be formed in a linear shape formed side by side in one direction of the substrate. At this time, the heat dissipation member 32 is preferably patterned so as not to disturb the area formed by the unit pixels of the electron emission unit (see dotted lines in FIGS. 4 and 5).

On the other hand, in the embodiment of the present invention, the pattern of the heat dissipation member is not limited to the above-described example, and various modifications may be made in the shape of the heat dissipation member.

In the above configuration, the electron emission unit is any one of the field emission array (FEA) type, the surface conduction emission (SCE) type, the metal-insulating layer-metal (MIM) type, and the metal-insulating layer-semiconductor (MIS) type. Consisting of electron-emitting devices.

The electron emission display according to the embodiment of the present invention includes, for example, an electron emission unit consisting of a field emission array type electron emission element.

Referring again to FIGS. 2 and 3, the electron emission unit 100 includes cathode electrodes 14 formed in a stripe pattern along one direction (y-axis direction in FIG. 1) of the first substrate 10, and an insulating layer. Gate electrodes 18 formed in a stripe pattern along a direction orthogonal to the cathode electrode 14 (the x-axis direction in FIG. 1) with the interposed therebetween and electron emission electrically connected to the cathode electrodes 14. And parts 20.

When the cross region of the cathode electrodes 14 and the gate electrodes 18 is defined as a pixel region, electron emission portions 20 are formed in each pixel region on the cathode electrodes 14, and the first insulating layer 16 is formed. Openings 161 and 181 corresponding to the electron emission units 20 are formed in the gate electrodes 18 to expose the electron emission units 20 on the first substrate 10.

The electron emission unit 20 may be formed of materials that emit electrons when an electric field is applied in a vacuum, such as a carbon crab material or a nanometer (nm) size material. That is, the electron emission unit 20 is composed of carbon nanotubes, graphite, graphite nanofibers, diamond, diamond phase carbon, fullerene (C ₆₀ ), silicon nanowires, and combinations thereof. On the other hand, the electron emission portion may be formed of a tip structure having a pointed tip mainly made of molybdenum (Mo) or silicon (Si).

The second insulating layer 22 and the focusing electrode 24 are sequentially formed on the gate electrodes 18. A second insulating layer 22 is positioned below the focusing electrode 24 to insulate the gate electrodes 18 and the focusing electrode 24, and passes the electron beam through the second insulating layer 22 and the focusing electrode 24. Openings 221 and 241 are provided respectively.

The focusing electrode 24 forms an opening corresponding to each electron emission part to individually focus electrons emitted from each electron emission part, or a plurality of electrons disposed in one unit pixel by forming one opening per unit pixel. The electrons emitted from the emitters 20 are collectively focused. The second case is shown in the figure.

Next, the light emitting unit 110 includes a fluorescent layer 26, for example, red, green, and blue fluorescent layers 26R and 26G on one surface of the second substrate 12 facing the first substrate 10. , 26B) are formed at random intervals from each other. A black layer 28 is formed between the fluorescent layers 26 to improve contrast of the screen. The fluorescent layer 26 is disposed so that the fluorescent layer of one color corresponds to the unit pixel set on the first substrate 10.

An anode electrode 30 made of a metal film such as aluminum is formed on the fluorescent layer 26 and the black layer 28. The anode electrode 30 receives the high voltage necessary for accelerating the electron beam from the outside to maintain the fluorescent layer 26 in a high potential state, and visible light emitted toward the first substrate 10 of the visible light emitted from the fluorescent layer 26. Is reflected toward the second substrate 12 to increase the brightness of the screen.

Meanwhile, in another embodiment of the present invention, the anode electrode may be made of a transparent conductive film such as ITO, in which case the anode electrode is positioned between the second substrate and the fluorescent layer. Furthermore, in another embodiment of the present invention, a structure in which a metal film is further formed thereon is also possible using the above-mentioned transparent conductive film as the anode electrode.

In addition, spacers 34 are disposed between the first substrate 10 and the second substrate 12 to maintain a constant gap between the two substrates 10 and 12 against the atmospheric pressure applied to the vacuum container. The spacers 34 are positioned corresponding to the black layer 28 so as not to invade the fluorescent layer 26.

Next, the driving process of the above-described electron emission display will be described.

The electron emission display is driven by supplying predetermined voltages to the cathode electrode 14, the gate electrode 18, the focusing electrode 24, and the anode electrode 30, respectively.

For example, any one of the cathode electrodes 14 and the gate electrodes 18 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 24 receives a voltage required for electron beam focusing, for example, a negative DC voltage of 0 volts (V) or several to collection volts (V), and the anode electrode 30 is a voltage required for electron beam acceleration. A positive DC voltage of several hundred to thousands of volts (V) is applied.

As a result, an electric field is formed around the electron emission unit 20 in the unit pixels in which the voltage difference between the cathode electrode 14 and the gate electrode 18 is greater than or equal to the threshold, thereby emitting electrons from the electron emission unit 20. The emitted electrons are focused through the opening 241 of the focusing electrode 24 to the center of the electron beam bundle, and are attracted to the fluorescent layer 26 of the corresponding unit pixel by being attracted by the high voltage applied to the anode electrode 30. The light is emitted to implement an arbitrary image.

In the above-described driving process, the heat dissipation members 32 and 32 'are formed on the first substrate 10 and the second substrate 12, respectively, in the electron emission display of the present embodiment. And heat generated from the light emitting unit 110 to the outside through the heat dissipation members 32 and 32 'contacting the outside air. Therefore, the heat accumulated in the electron emission display can be removed.

In addition, the heat dissipation members 32 and 32 ′ formed inside the vacuum chamber are connected to the heat dissipation sheet 321 outside the vacuum chamber, thereby rapidly dissipating heat to the outside of the vacuum vessel, thereby improving the heat dissipation effect.

Although the field emission array type electron emission display has been described above, the present invention is not limited to such a field emission array type, but the present invention is not limited to the surface conduction emission type, the metal-insulation layer-metal type, or the metal-insulation layer-semiconductor type electron emission display. Application is possible.

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.

In the electron emission display according to the exemplary embodiment of the present invention, a heat dissipation member may be formed on an outer surface of the substrate to release heat generated in the driving process into the atmosphere. In particular, by forming a patterned heat dissipation member on the substrate provided with the light emitting unit, it is possible to effectively radiate heat to the outside of the effective region without blocking light.

Therefore, it is possible to reduce the heat generation amount of each substrate to suppress damage to the internal structure due to heat generation, and to prevent abnormal light emission of the spacer due to heat generation.

In addition, since it is not necessary to provide a separate cooling device, power loss can be reduced, and thus the life characteristics of the electron emission display can be improved.

Claims (19)

A first substrate and a second substrate which are disposed to face each other at a predetermined interval and constitute a vacuum container; An electron emission unit provided on an inner surface of the first substrate; A light emitting unit provided on an inner surface of the second substrate; And Heat dissipation member formed on the other surface of at least one of the first substrate and the second substrate Electronic emission display comprising a. The method of claim 1, And the heat dissipation member is formed on the other surface of the second substrate. The method of claim 2, An effective area and an invalid area are formed in the second substrate, the heat radiating member is selectively formed in the effective area, and the heat radiating member is formed in the non-effective area as a whole. The method of claim 2, The heat dissipation member is formed in accordance with the pattern and position of the black layer constituting the light emitting unit. The method of claim 1, An electron emission display in which the heat dissipation member is formed of a metal. The method of claim 5, The heat dissipation member includes at least one material selected from the group consisting of graphite, gold, au, silver, copper, and aluminum. The method of claim 1, The heat dissipation member includes an electroconductive carbonaceous material. The method of claim 1, And the heat dissipation member is a flexible metal sheet. The method of claim 1, And the heat dissipation member has an end portion extended out of the vacuum container and exposed to the atmosphere. The method of claim 9, And a heat dissipation sheet attached to at least one end of the heat dissipation member to extend outside the vacuum container. The method of claim 10, The heat dissipation sheet, the electron emission display made of a flexible material. The method of claim 1, The heat dissipation member is an electron emission display formed through a vacuum deposition method. The method of claim 12, The heat radiation member has a thickness of 0.1 to 1.0㎛ electron emission display. The method of claim 1, The heat dissipation member is an electron emission display formed through a printing method. The method of claim 14, The thickness of the heat dissipation member is 1.0 to 10.0㎛ electron emission display. The method of claim 1, The electron emission unit, A first electrode formed on the first substrate along one direction of the first substrate; A second electrode formed along the direction crossing the first electrode with an insulating layer interposed therebetween; And An electron emission unit formed on the first electrode and electrically connected to the first electrode Electronic emission display comprising a. The method of claim 16, And a focusing electrode disposed on the first electrode and the second electrode, the insulation electrode being insulated from the first electrode and the second electrode. The method of claim 16, The electron emission unit is at least one selected from the group consisting of carbon nanotubes, graphite, graphite nanofibers, diamonds, diamond phase carbon, fullerene (C ₆₀ ) and silicon nanowires. The method of claim 1, The light emitting unit, A fluorescent layer formed on the second substrate; And An anode electrode formed on the second substrate while being connected to the fluorescent layer Electronic emission display comprising a.

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