KR20080087480A - Light emission device and display device using the same - Google Patents

Abstract

A light emitting device and a display device using the same are provided to prevent breakdown of a sealing member and deterioration of a degree of vacuum by enhancing coupling force of sealing members. First and second substrates(10,12) face each other. A sealing member(14) is between the first and second substrates, and couples the first substrate with the second substrate. The sealing member includes plural connection pieces(36) having a protrusion unit(136) and a recess unit(236) which are disposed to face each other. The connection pieces are connected by engagement coupling between the protrusion unit and the recess unit.

Description

Light emitting device and display device using the same {LIGHT EMISSION DEVICE AND DISPLAY DEVICE USING THE SAME}

1 is an exploded perspective view of a vacuum container for a light emitting device according to a first embodiment of the present invention.

FIG. 2 is a partially joined cross-sectional view of the vacuum vessel of FIG. 1 taken along line II. FIG.

3 is a partially exploded perspective view of a light emitting device according to a first embodiment of the present invention.

4 is a partial cross-sectional view of a light emitting device according to a first embodiment of the present invention.

5 is a perspective view of a connecting piece of the light emitting device according to the first embodiment of the present invention.

6 is a partial cross-sectional view of the light emitting device shown in order to explain a modification of the sealing member of the light emitting device according to the first embodiment of the present invention.

7 is a partially exploded perspective view of a light emitting device according to a second embodiment of the present invention.

8 is an exploded perspective view of a display device according to a first embodiment of the present invention using the light emitting device of the second embodiment as a light source.

The present invention relates to a light emitting device, and more particularly, to a sealing member interposed between a first substrate and a second substrate of the light emitting device. The present invention also relates to a display device using the light emitting device.

BACKGROUND ART A light emitting device including an electron emitting portion and a driving electrode on a first substrate, a fluorescent layer and an anode electrode on a second substrate, and emitting a visible light by exciting a fluorescent layer with electrons emitted from the electron emitting portion is known. . At this time, the first substrate and the second substrate are integrally bonded by the sealing member and the internal space is exhausted to form a vacuum container.

The structure of the glass bar which is fixed to the 1st board | substrate and the 2nd board | substrate by the adhesive layer as a sealing member is known. The glass bars are provided and arranged in plural along the edges of the first substrate and the second substrate, and the adhesive layer is provided between the one side of the glass bar facing the first substrate and the other side of the glass bar facing the second substrate and the glass bars. Thus, the first substrate and the second substrate can be bonded to each other.

However, in the structure of the sealing member as described above, since the adhesive layer between the glass bars is lower than the glass bar, it may be easily broken by external impact or vacuum pressure. As a result, problems such as damage to the inside of the vacuum container due to adhesive layer debris generated from the damaged adhesive layer or lowering the vacuum degree of the vacuum container due to the damaged adhesive layer occur.

Accordingly, the present invention is to solve the above problems, the present invention is to provide a plurality of sealing members provided between the substrates when bonding the substrates, the light emitting device that can enhance the rigidity of the sealing members and displays using the same To provide a device.

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

A first member and a second substrate disposed to face each other, and a sealing member disposed between the first substrate and the second substrate to join the first substrate and the second substrate, wherein the protrusion and the recessed portion of the sealing member are disposed to face each other. It provides a light emitting device comprising a plurality of connection pieces having a connection, the connection pieces are connected by a custom coupling of the projection and the depression.

The sealing member may be formed along edges of the first substrate and the second substrate.

The connecting pieces can be fixed by an adhesive layer interposed therebetween, and the adhesive layer can be further provided between the first substrate and the sealing member and between the second substrate and the sealing member.

The connecting piece may be formed of glass.

The protrusion and the recess may be located in pairs in the diagonal direction of the connecting piece.

In addition, the length of the depression along the thickness direction of the light emitting device may be formed to be equal to or greater than the length of the protrusion along the thickness direction of the light emitting device.

Other depressions may be disposed opposite each other with the projections interposed therebetween, and other projections may be disposed opposite each other with the depressions therebetween.

The protrusion and the recess may be disposed at the center of the connecting piece.

The light emitting device includes an electron emission unit formed on the first substrate and a light emission unit formed on the second substrate, the electron emission unit having a field emission array (FEA) type, a surface conduction emission (SCE) type, a metal-insulating layer-metal (MIM) type, metal-insulating layer-semiconductor (MIS) type of any one of the electron emitting element.

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

And a light emitting device and a display panel for displaying an image, wherein the light emitting device is disposed between the first and second substrates facing each other, and is disposed between the first and second substrates to join the first and second substrates. It provides a display device comprising a sealing member, wherein the sealing member comprises a plurality of connecting pieces having opposing protrusions and depressions, the connection pieces are connected by a custom coupling of the protrusion and the depression.

The display panel may be a liquid crystal display panel.

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.

In the following description, parts unnecessary for description are not shown in the drawings, and the same or similar components in each embodiment are given the same reference numerals for convenience.

In addition, the light emitting device mentioned in the embodiment of the present invention includes all devices capable of recognizing that light is emitted when viewed from the outside. Therefore, all display apparatuses that display information by displaying symbols, letters, numbers, and images, are also included in the light emitting apparatus. Such a light emitting device may be used as a light source for providing light to the light receiving display panel.

1 is an exploded perspective view of a vacuum container for a light emitting device according to a first exemplary embodiment of the present invention, and FIG. 2 is a partially joined cross-sectional view of the vacuum container of FIG. 1 taken along line II.

Referring to FIGS. 1 and 2, the vacuum container forming the exterior of the light emitting device includes a first substrate 10 and a second substrate 12 disposed to face each other in parallel with each other at predetermined intervals. The 1st board | substrate 10 and the 2nd board | substrate 12 are comprised by the container whose edge is joined to each other by the sealing member 14, and has an internal space. This container is evacuated in the manufacturing process of the light emitting device, and the inside thereof is evacuated to a vacuum of approximately 10 ⁻⁶ Torr to form a vacuum container.

One surface of the first substrate 10 facing the second substrate 12 is provided with an electron emission unit made of electron emission elements, and one surface of the second substrate 12 facing the first substrate 10 is provided with electrons. Provided is a light emitting unit that emits visible light.

Such an electron emitting unit and a light emitting unit together with the vacuum container described above constitute a light emitting device.

The electron emission unit may be any one of a field emission array (FEA) type, a surface conduction emission type (SCE) type, a metal-insulating layer-metal (MIM) type, and a metal-insulating layer-semiconductor (MIS) type. And emit electrons toward the light emitting unit. The light emitting unit includes a fluorescent layer and an anode electrode for accelerating electrons emitted from the electron emitting unit to the fluorescent layer.

3 and 4 are partial exploded perspective views and partial cross-sectional views of the light emitting device according to the first embodiment of the present invention, respectively, and show, for example, a field emission array type electron emission unit. The light emitting devices shown in Figs. 3 and 4 are for illustrating the present invention, but the present invention is not limited thereto.

First, the electron emission unit 100 has the first electrodes 18 and the second electrodes formed on the first substrate 10 having a stripe pattern along a direction crossing each other with the first insulating layer 16 therebetween. Electrodes 20 and electron emitters 22 electrically connected to any one of the first electrodes 18 and the second electrodes 20.

When the electron emission portion is formed in the first electrode, the first electrode becomes a cathode electrode for supplying current to the electron emission portion, and the second electrode forms an electric field around the electron emission portion by the voltage difference with the cathode electrode, It becomes a gate electrode which induces emission. On the contrary, when the electron emission portion is formed in the second electrode, the second electrode becomes a cathode electrode and the first electrode becomes a gate electrode.

In the drawing, openings 161 and 201 are formed in the first insulating layer 16 and the second electrode 20 in the intersecting area of the first electrode 18 and the second electrode 20, that is, in each pixel area. A case in which a part of the surface of the electrode 18 is exposed and the electron emission part 22 is positioned on the first electrode 18 inside the openings 161 and 201 is illustrated.

The electron emission unit 22 may be formed of materials emitting electrons when a electric field is applied in a vacuum, such as a carbon-based material or a nanometer-sized material. The electron emitter 22 may include, for example, 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. .

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).

A third electrode 24 that functions as a focusing electrode may be formed on the first insulating layer 16 and the second electrode 20. A second insulating layer 26 is disposed under the third electrode 24 to insulate the second electrode 20 and the third electrode 24, and the third electrode 24 and the second insulating layer 26. Openings 241 and 261 are also provided for electron beam passage.

The opening of the third electrode 24 may be formed as an opening corresponding to each of the electron emission parts 22 so as to focus electrons emitted from each of the electron emission parts 22 on a one-to-one basis, or a plurality of electron emission parts. One opening may be formed with respect to 22 to comprehensively focus electrons emitted from the electron emission section 22. In FIG. 1, the opening 241 of the third electrode 24 is provided in the second case.

Next, the light emitting unit 110 will be described. On one surface of the second substrate 12, the fluorescent layer 28, for example, the red, green, and blue fluorescent layers 28R, 28G, and 28B may be disposed on each other. It is formed at intervals, and a black layer 30 is formed between the fluorescent layers 28 to improve the contrast of the screen. The fluorescent layer 28 may be disposed such that one color of the fluorescent layers 28R, 28G, and 28B correspond to one pixel area.

An anode electrode 32 formed of a metal film such as aluminum (Al) is formed on the fluorescent layer 28 and the black layer 30. The anode electrode 32 receives the high voltage required for electron beam acceleration from the outside of the vacuum container to maintain the fluorescent layer 28 in a high potential state, and toward the first substrate 10 of the visible light emitted from the fluorescent layer 28. The luminance of the screen is increased by reflecting the emitted visible light toward the second substrate 12.

On the other hand, the anode electrode may be made of a transparent conductive film such as indium tin oxide (ITO). In this case, the anode is positioned on one surface of the fluorescent layer 28 and the black layer 30 facing the second substrate 12. In addition, the above-described metal film and the transparent conductive film may be simultaneously formed as the anode electrode, or only the transparent conductive film may be formed. Here, when the transparent conductive film is prepared as an anode electrode, the metal film may be provided as a metal back.

And between the first substrate 10 and the second substrate 12 spacers for maintaining a constant distance between the first substrate 10 and the second substrate 12 against the external pressure applied to the vacuum vessel ( 34) can be arranged. The spacers 34 are positioned corresponding to the black layer 30 so as not to invade the fluorescent layer 28.

Referring again to FIGS. 1 and 2, in the first embodiment, the sealing member 14 may include a plurality of connection pieces 36 for maintaining a constant distance between the first substrate 10 and the second substrate 12. Include. Each connecting piece 36 forms a protrusion 136 and a depression 236 and is connected to each other by a custom coupling of the protrusion 136 and the depression 236.

5 is a perspective view of a connecting piece 36 of the light emitting device according to the first embodiment of the present invention.

Referring to FIG. 5, the connecting piece 36 has opposing protrusions 136 and depressions 236. The protrusion 136 and the recess 236 may be formed in a pair in a diagonal direction (the x-axis direction of FIG. 5) of the connection piece 36, and may have shapes corresponding to each other.

When the sealing member 14 is disposed between the first substrate 10 and the second substrate 12, the protrusion 136 of the connecting piece 36 and the connecting piece adjacent to the connecting piece 36 ( Recess 236 of 36 is disposed by fit engagement. In this case, an adhesive layer 38 is provided between the first substrate 10 and the connection piece 36, between the second substrate 12 and the connection piece 36, and between the connection pieces 36 to provide a first layer. The substrate 10 and the second substrate 12 are bonded to each other. The adhesive layer 38 increases the airtightness of the vacuum container by blocking micro gaps that may occur at a contact portion between the first substrate 10, the second substrate 12, and the connection pieces 36.

Referring to FIG. 2, a predetermined gap is formed between the protrusion 136 and the depression 236 to insert the adhesive layer 38. That is, the length L2 of the depression 236 in the thickness direction of the light emitting device is greater than the length L1 of the protrusion 136 in the thickness direction of the light emitting device (L1 <L2). Here, the thickness direction of the light emitting device means a direction perpendicular to the plane of the first substrate 10 and the plane of the second substrate 12 (the z-axis direction in FIG. 2).

The connection piece 36 may be made of glass, and may be provided as a known frit bar to bond the first substrate 10 and the second substrate 12 without an adhesive layer. When the connecting piece is formed of a frit bar, the length of the depression and the protrusion may be the same.

The light emitting device having the above-described configuration is driven by supplying a predetermined voltage to the first electrode 18, the second electrode 20, the third electrode 24, and the anode electrode 32 from the outside.

For example, any one of the first electrodes 18 and the second electrodes 20 functions as scan electrodes by receiving a scan driving voltage, and the other electrodes function as data electrodes by receiving a data driving voltage. do.

The third electrode 24 receives a voltage required for electron beam focusing, for example, a negative DC voltage of 0 volts (V) or several to several tens of volts (V), and the anode electrode 32 is a voltage required for electron beam acceleration. In one example, a positive DC voltage of several hundred to several thousand volts (V) is applied.

Then, an electric field is formed around the electron emission part 22 in the pixel areas in which the voltage difference between the first electrode 18 and the second electrode 20 is greater than or equal to the threshold, and electrons are emitted therefrom. The emitted electrons form an electron beam and focus while passing through the opening 241 of the third electrode 24, and are attracted to the fluorescent layer 28 of the corresponding pixel region by being attracted by the high voltage applied to the anode electrode 32. It emits light.

As described above, the sealing member 14 according to the first exemplary embodiment of the present invention has the protrusion 136 and the recessed portion 236 mechanically coupled to each other, thereby increasing the bonding force between the sealing members 14, and the protrusion at the engagement portion. As the fields 136 overlap, the vacuum pressure of the first substrate 10 and the second substrate 12 may be efficiently supported.

Therefore, the light emitting device according to the first embodiment of the present invention has an effect of preventing damage to the internal structure of the vacuum container and lowering the degree of vacuum due to damage of the adhesive layer 38.

6 is a partial cross-sectional view of the light emitting device shown in order to explain a modification of the sealing member of the light emitting device according to the first embodiment of the present invention.

Referring to FIG. 6, the protrusions 136 may be disposed to face each other with the other recess 236 interposed therebetween, and the recesses 236 may be disposed to face each other with the other protrusion 136 interposed therebetween.

One surface of the connecting piece 36 facing the first substrate 10 (hereinafter, referred to as 'first surface') and the other surface of the connecting piece 36 facing the second substrate (hereinafter referred to as the 'second surface' Are spaced apart from each other at predetermined intervals.

Since the connecting piece 36 of this shape is joined to the recessed portion 236 of the adjacent connecting piece 36, both surfaces of the protrusion 136 facing the first substrate 10 and the second substrate 12 are joined to each other. Coupling force between the (36) can be increased.

Therefore, the sealing member 14 of the present modification improves the bonding force of the connecting pieces 36 by the mechanical coupling between the connecting pieces 36, thereby ensuring an excellent degree of vacuum of the vacuum container.

On the other hand, the connecting piece may be disposed in the center of the connecting piece and the recessed portion, such that the protrusion can be inserted completely into the recessed portion.

Although the above-described light emitting device has a function of a display by itself, the light emitting device of the present embodiment may be used as a surface light source of a light receiving display device.

7 is a partially exploded perspective view of a light emitting device according to a second embodiment of the present invention. This light emitting device is used as a surface light source of the light receiving display device.

Referring to Fig. 7, the light emitting device 40 of the second embodiment has the same basic configuration as the above-described light emitting device. However, the size of the unit pixel formed by the intersection area between the first electrode 18 'and the second electrode 20', the number of electron emission units 22 'formed for each unit pixel, and the configuration of the light emitting unit 110' Will be different from the above-described embodiment, it will be described.

In the electron emission unit 100 ′ of the present exemplary embodiment, one intersection region of the first electrode 18 ′ and the second electrode 20 ′ corresponds to one pixel region of the light emitting device 40, or two or more intersection regions are formed. It may correspond to one pixel area of the light emitting device 40. In the second case, two or more first electrodes 18 ′ and / or two or more second electrodes 20 ′ corresponding to one pixel area are electrically connected to each other to receive the same driving voltage.

The light emitting unit 110 ′ includes a fluorescent layer 28 ′ positioned on one surface of the second substrate 12 ′ and an anode electrode 32 ′.

The fluorescent layer 28 'may be formed of a white fluorescent layer emitting white light. The fluorescent layer may be formed in the entire effective area of the second substrate 12 ′, or may be divided and disposed in a predetermined pattern so that one white fluorescent layer is positioned in each pixel area.

On the other hand, the fluorescent layer may be composed of a combination of red, green and blue fluorescent layers, these fluorescent layers may be divided into a predetermined pattern in one pixel area.

In FIG. 7, one white fluorescent layer is positioned in each pixel area.

The anode electrode 32 'may be made of a metal film such as aluminum to cover the surface of the fluorescent layer 28'. The anode electrode 32 ′ is an acceleration electrode for attracting an electron beam to maintain the fluorescent layer 28 ′ at a high potential by applying a high voltage, and the first substrate 10 ′ of visible light emitted from the fluorescent layer 28 ′. The visible light emitted toward the second substrate 12 'is reflected to increase the luminance.

When the first electrodes 18 ′ and the second electrodes 20 ′ receive a predetermined driving voltage, the electron emission units 22 ′ in the pixels in which the voltage difference between the two electrodes 18 ′ and 20 ′ is greater than or equal to the threshold. An electric field is formed around and electrons are emitted from it. The emitted electrons are attracted by the high voltage applied to the anode electrode 32 'and impinge on the corresponding fluorescent layer 28' site. This collision causes the fluorescent layer 28 'to emit light, and the emission intensity of the fluorescent layer 28' for each pixel corresponds to the electron beam emission amount of the corresponding pixel.

In this case, the first substrate 10 'and the second substrate 12' may be positioned at a greater distance than the light emitting device of the first embodiment.

8 is an exploded perspective view of a display device according to a first embodiment of the present invention using the light emitting device of the second embodiment as a light source. The display device shown in FIG. 8 is for illustrating the present invention, but the present invention is not limited thereto.

Referring to FIG. 8, the display device 200 includes a light emitting device 40 and a display panel 42 positioned in front of the light emitting device 40. A diffusion plate 44 may be disposed between the light emitting device 40 and the display panel 42 to uniformly diffuse the light emitted from the light emitting device 40 to provide the display panel 42. The light emitting device 40 is spaced apart by a predetermined distance. A top chassis 46 and a bottom chassis 48 are positioned in front of the display panel 42 and behind the light emitting device 40, respectively.

The display panel 42 is formed of a liquid crystal display panel or another light receiving display panel. Below, the case where the display panel 42 is a liquid crystal display panel is demonstrated as an example.

The display panel 42 includes a TFT substrate 50 composed of a plurality of thin film transistors (TFTs), a color filter substrate 52 positioned on the TFT substrate 50, and these substrates 50, 52. ), And a liquid crystal layer (not shown) injected between them. Polarizers (not shown) are attached to the upper portion of the color filter substrate 52 and the lower portion of the TFT substrate 50 to polarize light passing through the display panel 42.

A data line is connected to a source terminal of each TFT, a gate line is connected to a gate terminal, and a pixel electrode made of a transparent conductive film is connected to a drain terminal. When electrical signals are input from the printed circuit boards 54 and 56 to the gate lines and the data lines, respectively, electrical signals are input to the gate terminal and the source terminal of the TFT, and the TFT is turned on or off depending on the signal input. The electrical signal required for pixel formation is then output to the drain terminal.

The color filter substrate 52 forms an RGB pixel which is a color pixel in which a predetermined color is expressed while light passes, and a common electrode made of a transparent conductive film is formed on the entire surface. When power is applied to the gate terminal and the source terminal of the TFT and the TFT is turned on, an electric field is formed between the pixel electrode and the common electrode. The array angle of the liquid crystal injected between the TFT substrate 50 and the color filter substrate 52 is changed by this electric field, and the light transmittance is changed for each pixel according to the changed array angle.

The printed circuit boards 54 and 56 of the display panel 42 are connected to the respective driving IC packages 154 and 156. In order to drive the display panel 42, the gate printed circuit board 54 transmits a gate driving signal, and the data printed circuit board 56 transmits a data driving signal.

The light emitting device 40 forms fewer pixels than the display panel 42 so that one pixel of the light emitting device 40 corresponds to two or more pixels of the display panel 42. Each pixel of the light emitting device 40 may emit light corresponding to the highest gray level among the pixels of the display panel 42 corresponding thereto, and the light emitting device 40 may express a gray level of 2 to 8 bits for each pixel. have.

For convenience, a pixel of the display panel 42 is called a first pixel, a pixel of the light emitting device 40 is called a second pixel, and a plurality of first pixels corresponding to one second pixel is called a first pixel group. .

In the driving process of the light emitting device 40, a signal controller (not shown) that controls the display panel 42 detects the highest gray level among the first pixels of the first pixel group, and according to the detected gray level, the second pixel. The method may include calculating a grayscale required for light emission, converting the grayscale to digital data, and generating a driving signal of the light emitting device 40 using the digital data. The driving signal of the light emitting device 40 includes a scan driving signal and a data driving signal.

A printed circuit board (not shown) of the light emitting device 40, that is, a scan printed circuit board and a data printed circuit board, is connected to each of the driving IC packages 158 and 160, respectively. In order to drive the light emitting device 40, the scan printed circuit board transmits a scan drive signal, and the data printed circuit board transmits a data drive signal. One of the above-described first electrode 18 'and the second electrode 20' receives the scan driving signal, and the other electrode receives the data driving signal.

The second pixel of the light emitting device 40 emits light with a predetermined gray level in synchronization with the first pixel group when an image is displayed in the corresponding first pixel group. As such, the light emitting device 40 independently controls the light emission intensity of each pixel to provide light of appropriate intensity to the pixels of the display panel 42 corresponding to each pixel. Therefore, the display device 200 according to the present exemplary embodiment may increase the dynamic contrast of the screen, and implement a clearer picture quality.

Although the preferred embodiments of the present invention have 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 belongs to the range of.

As described above, the light emitting device according to the present invention may increase the bonding force of the sealing members to prevent breakage of the sealing member and consequent decrease in vacuum. In addition, the display device according to the present invention can improve display quality by increasing the dynamic contrast ratio of the screen by driving the pixel for each pixel.

Claims (10)

A first substrate and a second substrate disposed to face each other; And A sealing member disposed between the first substrate and the second substrate to bond the first substrate and the second substrate; Including; The sealing member includes a plurality of connecting pieces having oppositely arranged protrusions and depressions, and the connection pieces are connected by custom coupling of the protrusions and the depressions. The method of claim 1, And the sealing member is formed along edges of the first substrate and the second substrate. The method of claim 1, And the connecting pieces are fixed by an adhesive layer interposed therebetween. The method of claim 3, And the adhesive layer is further provided between the first substrate and the sealing member and between the second substrate and the sealing member. The method of claim 1, The light emitting device of claim 2, wherein the protrusion and the depression are located in pairs in a diagonal direction of the connection piece. The method of claim 1, And a length of the depression along the thickness direction of the light emitting device is equal to or greater than a length of the protrusion along the thickness direction of the light emitting device. The method of claim 1, A light emitting device in which another recess is disposed to face each other with the protrusion interposed therebetween, and another protrusion is disposed to face the recess and the other recess. The method of claim 7, wherein And the protrusion and the recessed portion are disposed at the center of the connection piece. The method of claim 1, An electron emission unit formed on the first substrate; And Light emitting unit formed on the second substrate Including, The electron emission unit may be any one of a field emission array (FEA) type, a surface conduction emission (SCE) type, a metal-insulating layer-metal (MIM) type, and a metal-insulating layer-semiconductor (MIS) type. Light emitting device consisting of. The light emitting device according to any one of claims 1 to 9; And Display panel which displays image Display device comprising a.

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