KR20090095272A - Light emission device and display device using the light emission device as light source - Google Patents

Abstract

A light emission device and display device using the light emission device as light source are provided to improve the luminous efficiency by using the first fluorescent layer and the second fluorescent layer. The first substrate(12) is separated from the second substrate(14) by a vacuum region. The electron emission unit(24) is located in the first substrate. The sealing member(16) is formed in the edge of the first and the second substrate. The vacuum-panel(18) is formed by the first and the second substrate and sealing member. The electron emission unit(20) is formed in the effective region of the inner surface of the first substrate. The electron emission unit comprises driving electrodes for controlling the amount of emission current of the electron emission unit and electron emission units. The luminous unit(22) comprises the metal reflection coating layer(38) covering the first fluorescent layer and the second fluorescent layer and the first fluorescent layer(34) and the second fluorescent layer(36) disposed at the one side of the anode electrode(32).

Description

Light emitting device and display device using the light emitting device as a light source {LIGHT EMISSION DEVICE AND DISPLAY DEVICE USING THE LIGHT EMISSION DEVICE AS LIGHT SOURCE}

The present invention relates to a light emitting device and a display device using the light emitting device as a light source, and more particularly, to a light emitting unit provided in the light emitting device to emit visible light.

When all devices capable of recognizing that light is emitted from the outside are light emitting devices, a light emitting device having a fluorescent layer and an anode electrode on a front substrate and an electron emission part and a driving electrode on a rear substrate is known. have. The front substrate and the rear substrate are integrally bonded to the edge by the sealing member and the internal space is exhausted to form a vacuum panel together with the sealing member.

The driving electrode may be composed of cathode electrodes and gate electrodes arranged to be orthogonal to each other. In this case, the electron emission portion is disposed on the cathode electrode at each intersection region of the cathode electrode and the gate electrode. On the other hand, the driving electrode may be composed of cathode electrodes and gate electrodes that have a comb-tooth shape and are alternately disposed. In this case, the electron emission portion is located on the side of the cathode electrode facing the gate electrode.

The light emitting device forms a plurality of pixels by using a combination of cathode electrodes and gate electrodes. In addition, a predetermined driving voltage is applied to the cathode electrodes and the gate electrodes to control the emission current of the electron emission units for each pixel, thereby controlling the luminance of the phosphor layer for each pixel. Such a light emitting device can be used as a light source in a display device having a non-light emitting display panel such as a liquid crystal display panel.

However, in the conventional light emitting device, the fluorescent layer is provided with a strong electron beam in the pixel area facing the electron emission parts along the thickness direction of the light emitting device to emit visible light of high luminance, while between the pixel areas not facing the electron emission parts. Since the region is not provided with electrons or is provided with a very small amount of electrons emitted from the pixel area, it displays black or emits visible light having an extremely low luminance.

Since the light emission uniformity of the fluorescent layer is low as described above, the conventional light emitting device improves the light emission uniformity of the light emitting device by disposing a plurality of diffusion plates in front of the vacuum panel, that is, between the vacuum panel and the display panel. However, since the light loss occurs due to the plurality of diffusion plates, the amount of light reaching the final display panel is lowered, thereby lowering the efficiency (luminance / power consumption) of the light emitting device.

An object of the present invention is to provide a light emitting device capable of increasing the luminous efficiency and uniformity of light emission of a fluorescent layer and minimizing a decrease in light transmittance due to a diffuser plate and improving the efficiency, and a display device using the light emitting device as a light source.

A light emitting device according to an embodiment of the present invention includes a first substrate and a second substrate that are disposed to face each other with a vacuum region therebetween, electron emission parts positioned on an inner surface of the first substrate, and an inner surface of the first substrate. Driving pixels for controlling the amount of emission currents of the electron emission parts for each pixel, an anode disposed on an inner surface of the second substrate, and a first fluorescent light formed at a distance corresponding to the pixel regions on one surface of the anode electrode; Layers and a second fluorescent layer disposed between the first fluorescent layers on one surface of the anode electrode. The first fluorescent layers are excited by electrons and emit light, and the second fluorescent layer is excited by ultraviolet rays and emit light.

The first fluorescent layer may be formed of a white phosphor mixed with a red phosphor, a green phosphor, and a blue phosphor. The red phosphor is any one selected from the group consisting of Y ₂ O ₃ : Eu, Y ₂ O ₂ S: Eu, SrTiO ₃ : Pr, and a combination thereof, and the green phosphor is Y ₂ SiO ₅ : Tb, Gd ₂ O ₂ S: Tb, ZnS: (Cu, Al), ZnSiO ₄ : Mn, Zn (Ga, Al) ₂ O ₄ : Mn, SrGa ₂ S ₄ : Eu, and any combination thereof The blue phosphor may be any one selected from the group consisting of ZnS: (Ag, Al), Y ₂ SiO ₅ : Ce, BaMgAl ₁₀ O ₁₇ : Eu, and combinations thereof. The first fluorescent layer may include 15 to 30 parts by weight of the red phosphor, 30 to 60 parts by weight of the green phosphor, and 24 to 45 parts by weight of the blue phosphor.

The second fluorescent layer may be a phosphor that emits light by ultraviolet rays in the 380 to 490 nm region, and may be formed of a white phosphor in which a red phosphor, a green phosphor, and a blue phosphor are mixed. The red phosphor is (Y, Gd) BO ₃ : Eu, the green phosphor is Zn ₂ SiO ₄ : Mn, and the blue phosphor is BaMgAl ₁₀ O ₁₇ : Eu, CaMgSi ₂ O ₈ : Eu, BaMgAl ₁₀ O ₁₇ : Eu, CaMgSi _It may be any one selected from the group consisting of ₂ O ₈ : Eu, and combinations thereof. The second fluorescent layer may include 15 to 30 parts by weight of the red phosphor, 30 to 60 parts by weight of the green phosphor, and 24 to 45 parts by weight of the blue phosphor.

The driving electrodes may include cathode electrodes and gate electrodes that are orthogonal to each other with the insulating layer interposed therebetween, and one or more crossing regions in which the cathode electrodes and the gate electrodes overlap each other may correspond to the pixel region.

On the other hand, the driving electrodes may include cathode electrodes and gate electrodes positioned parallel to the cathode electrode between the cathode electrodes, and the cathode and gate electrodes are respectively connected to the first connection part and the second connection part for each pixel area. It can be electrically connected by.

The display device according to an exemplary embodiment of the present invention includes the above-described light emitting device and a display panel positioned in front of the light emitting device. When the display panel forms the first pixels, the light emitting device forms a smaller number of second pixels than the display panel, and each of the second pixels may independently emit light corresponding to the gray levels of the first pixels corresponding to the display panel. have. The display panel may be a liquid crystal display panel.

The light emitting device according to the present invention includes a first fluorescent layer that emits light by an electron beam and a second fluorescent layer that emits light by ultraviolet rays, thereby improving luminous efficiency and improving luminous uniformity. Accordingly, the display device according to the present invention does not have a diffusion plate disposed between the light emitting device and the display panel, or a smaller number of diffusion plates may be disposed than in the related art, thereby realizing a high brightness screen by minimizing light loss caused by the diffusion plate.

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 partial cross-sectional view of a light emitting device according to a first embodiment of the present invention, and FIG. 2 is an exploded perspective view showing the inside of an effective area of the light emitting device shown in FIG. 1.

1 and 2, the light emitting device 100 according to the present exemplary embodiment includes a first substrate 12 and a second substrate 14 disposed to face each other at a predetermined distance. At the edge of the first substrate 12 and the second substrate 14, a sealing member 16 for joining the substrates 12 and 14 is positioned, and the internal space is evacuated with a vacuum of approximately 10 ^-6 Torr. The first substrate 12, the second substrate 14, and the sealing member 16 constitute the vacuum panel 18.

The region located inside the sealing member 16 among the first substrate 12 and the second substrate 14 may be divided into an effective region contributing to the actual visible light emission and an ineffective region surrounding the effective region. The electron emission unit 20 for emitting electrons is positioned in the effective region of the inner surface of the first substrate 12, and the light emitting unit 22 for emitting visible light is positioned in the effective region of the inner surface of the second substrate 14.

The electron emission unit 20 includes an electron emission unit 24 and drive electrodes for controlling the amount of emission current of the electron emission unit 24. The driving electrodes may include cathode electrodes 26 formed in a stripe pattern along one direction (y-axis direction of the drawing) of the first substrate 12 and the cathode electrodes 26 with an insulating layer 28 therebetween. The gate electrodes 30 may be formed in a stripe pattern along a direction crossing the cathode electrodes 26 (the x-axis direction of the drawing).

Openings 301 and 281 are formed in the gate electrode 30 and the insulating layer 28 at each intersection region of the cathode electrodes 26 and the gate electrode 30 to expose a portion of the surface of the cathode electrode 26 and insulate the insulating layer 26. An electron emission part 24 is positioned on the cathode electrode 26 inside the layer opening 281. The electron emission part 24 is a material selected from the group consisting of materials emitting electrons when an electric field is applied in a vacuum, such as carbon nanotubes, graphite, graphite nanofibers, diamond-like carbon, fullerenes, silicon nanowires, and combinations thereof. It may include.

In the above-described structure, one intersection region of the cathode electrode 26 and the gate electrode 30 may correspond to one pixel region of the light emitting device 100, or two or more intersection regions may correspond to one pixel region of the light emitting device 100. Can be.

The light emitting unit 22 includes an anode electrode 32, a first fluorescent layer 34 and a second fluorescent layer 36 located on one surface of the anode electrode 32, a first fluorescent layer 34, and a second fluorescent layer 34. And a metal reflective film 38 covering the fluorescent layer 36. The anode electrode 32 is applied with a high voltage (anode voltage) of 5 kV or more to maintain the first fluorescent layer 34 and the second fluorescent layer 36 in a high potential state, and the first fluorescent layer 34 and the second It is formed of a transparent conductive material such as indium tin oxide (ITO) so as to transmit visible light emitted from the fluorescent layer 36.

The metal reflective film 38 may be an aluminum thin film having a thin thickness of several thousand ohms, and forms fine holes for electron beam passage. The metal reflective film 38 reflects the visible light emitted toward the first substrate 12 among the visible light emitted from the first fluorescent layer 34 and the second fluorescent layer 36 toward the second substrate 14 to provide a light emitting surface. Increase the brightness On the other hand, the anode electrode 32 is omitted, the metal reflective film 38 may be applied as an anode voltage to function as an anode electrode.

In the present exemplary embodiment, the first fluorescent layer 34 is positioned corresponding to the pixel region, and is excited by electrons emitted from the electron emission unit 24 as a cathode luminescence (CL) fluorescent layer to emit visible light. .

The first fluorescent layer 34 may be formed of a white phosphor mixed with a red phosphor, a green phosphor, and a blue phosphor. The red phosphor may be any one selected from the group consisting of Y ₂ O ₃ : Eu, Y ₂ O ₂ S: Eu, SrTiO ₃ : Pr, and a combination thereof. Green phosphors are Y ₂ SiO ₅ : Tb, Gd ₂ O ₂ S: Tb, ZnS: (Cu, Al), ZnSiO ₄ : Mn, Zn (Ga, Al) ₂ O ₄ : Mn, SrGa ₂ S ₄ : Eu, And combinations thereof may be any one selected from the group consisting of. The blue phosphor may be any one selected from the group consisting of ZnS: (Ag, Al), Y ₂ SiO ₅ : Ce, BaMgAl ₁₀ O ₁₇ : Eu, and combinations thereof.

The first fluorescent layer 34 may include 15 to 30 parts by weight of the red phosphor, 30 to 60 parts by weight of the green phosphor, and 24 to 45 parts by weight of the blue phosphor. When the first fluorescent layer 34 includes the red phosphor, the green phosphor, and the blue phosphor in the content range, when the first phosphor layer 34 is used in the light emitting device 100, the light emitting device 100 emits light of the display device described below. When used to provide white light to the display panel, the light emitted from the light emitting device 100 is excellent in luminance even after passing through the display panel, and an appropriate color coordinate can be obtained.

The second fluorescent layer 36 is positioned between the pixel regions, that is, between the first fluorescent layers 34, and is excited by ultraviolet rays as a photo luminescence (PL) fluorescent layer to emit visible light.

3 is a graph showing an emission spectrum of a light emitting device measured under a condition that a fluorescent layer is not provided on a second substrate. Referring to FIG. 3, it can be seen that ultraviolet rays in the wavelength range of about 380 to 490 nm are emitted in an experiment in which electrons are emitted toward the anode electrode by driving a light emitting device in which no fluorescent layer is formed on the second substrate. In the light emitting device used in the experiment, the anode voltage was 7 kV, and the emission current amount of the electron emitting portion was about 4 mA / mm ² .

Accordingly, the second fluorescent layer 36 is formed of a PL phosphor that emits light by ultraviolet rays generated in the light emitting device 100 by electron beam emission, particularly ultraviolet rays in the region of 380 to 490 nm.

The second phosphor layer 36 may be formed of a white phosphor mixed with a red phosphor, a green phosphor, and a blue phosphor. The red phosphor may use (Y, Gd) BO ₃ : Eu, but is not limited thereto. The green phosphor may use Zn ₂ SiO ₄ : Mn, but is not limited thereto. The blue phosphor may be any one selected from the group consisting of BaMgAl ₁₀ O ₁₇ : Eu, CaMgSi ₂ O ₈ : Eu, BaMgAl ₁₀ O ₁₇ : Eu, CaMgSi ₂ O ₈ : Eu, and combinations thereof, but is not limited thereto. It is not. As the blue phosphor, it is more preferable to use a mixture of CaMgSi ₂ O ₈ : Eu or BaMgAl ₁₀ O ₁₇ : Eu and CaMgSi ₂ O ₈ : Eu.

The second fluorescent layer 36 may include 15 to 30 parts by weight of the red phosphor, 30 to 60 parts by weight of the green phosphor, and 24 to 45 parts by weight of the blue phosphor. When the second fluorescent layer 36 includes the red phosphor, the green phosphor, and the blue phosphor in the content range, when the second phosphor layer 36 is used in the light emitting device 100, the light emitting device 100 is used as a light source of the display device to display the light. When the white light is provided to the panel, the light emitted from the light emitting device 100 passes through the display panel, and thus the luminance is excellent and appropriate color coordinates can be obtained.

4 is a plan view of the first fluorescent layer and the second fluorescent layer, wherein the first fluorescent layer 34 is formed in a quadrangular shape according to the pixel shape of the light emitting device, and the second fluorescent layer 36 is formed of the first fluorescent layers ( It may be formed in a grid shape having a predetermined width between the 34). 1 and 2 illustrate, for example, a case in which the first fluorescent layer 34 is positioned corresponding to each of the crossing regions of the cathode electrode 26 and the gate electrode 30.

When the horizontal and vertical widths of the first fluorescent layer 34 are 10 mm, the second fluorescent layer 36 may be formed to have a width of approximately 0.1 mm, and about 3 to 5 of the effective area area of the light emitting device 100. May take%.

The light emitting device 100 having the above-described structure applies a scan driving voltage to one of the cathode electrodes 26 and the gate electrodes 30, applies a data driving voltage to the other electrodes, and an anode electrode. It is driven by applying an anode voltage of 5 kV or more to (32).

Then, an electric field is formed around the electron emission part 24 in pixels where the voltage difference between the cathode electrode 26 and the gate electrode 30 is greater than or equal to the threshold value, and electrons are emitted therefrom. 1 impinges on the fluorescent layer 34 to emit light. The second fluorescent layer 36 emits light by ultraviolet rays generated in the light emitting device 100.

Accordingly, the light emitting device 100 according to the present exemplary embodiment may increase luminous efficiency and improve luminous uniformity by simultaneously emitting the first fluorescent layer 34 and the second fluorescent layer 36. As a result, since the diffusion plate may not be disposed on the front surface of the vacuum panel 18 or a smaller number of diffusion plates may be disposed than before, light loss caused by the diffusion plate may be minimized.

FIG. 5 is a partial plan view of the electron emission unit of the light emitting device according to the second embodiment of the present invention, and FIG. 6 is a perspective view of the electron emission element shown in FIG.

5 and 6, the light emitting device of this embodiment has the same configuration as the light emitting device of the first embodiment described above except for the structure of the electron emitting unit described below.

In the present embodiment, the electron emission unit 201 includes electron emission elements 40 positioned one by one for each pixel. Each electron-emitting device 40 includes cathode electrodes 261, gate electrodes 302 positioned parallel to the cathode electrode 261 between the cathode electrodes 261, and a cathode facing the gate electrode 302. Electron emission portions 241 positioned on the side of the electrode 261.

The cathode electrodes 261 are electrically connected at one end by the first connection part 42, and the gate electrodes 302 are electrically connected at the opposite end by the second connection part 44.

The first wiring part 46 and the second wiring part 48 are positioned between the electron emission devices 40. The first wiring portion 46 connects the first connecting portions 42 of the electron emission elements 40 positioned along the y-axis direction of the drawing, and the second wiring portion 48 connects the x-axis direction of the drawing. The second connections 44 of the electron emission devices 40 positioned along the same are connected to each other. An insulating film 50 is positioned between the first wiring portion 46 and the second wiring portion 48 to prevent the two wiring portions 46 and 48 from shorting.

One of the first wiring part 46 and the second wiring part 48 receives the scan driving voltage, and the other wiring part receives the data driving voltage. Therefore, in the pixels where the voltage difference between the cathode electrode 261 and the gate electrode 302 is greater than or equal to the threshold, an electric field is formed around the electron emission part 241 to emit electrons therefrom.

In the above, the case where the cathode electrodes and the gate electrodes are arranged to be orthogonal to each other and the case where the electrodes are disposed side by side at a distance from each other are described. . Further, the electron emission unit may be formed of any one of the surface-conducting emission type, the metal-insulation layer-metal type, and the metal-insulation layer-semiconductor type in addition to the above-described field emission array type.

7 is an exploded perspective view of a display device according to an exemplary embodiment.

Referring to FIG. 7, the display device 200 according to the present exemplary embodiment includes a light emitting device 100 and a display panel 60 positioned in front of the light emitting device 100. As the light emitting device 100 includes the first fluorescent layer and the second fluorescent layer to realize improved luminance uniformity, the light emitting device 100 does not have a diffusion plate between the light emitting device 100 and the display panel 60 or has a reduced size than before. A number of diffuser plates can be provided. In FIG. 7, a diffusion plate 52 is positioned between the light emitting device 100 and the display panel 60.

The display panel 60 is made of a liquid crystal display panel or other non-self-emitting display panel. The case where the display panel 60 is a liquid crystal display panel is described below.

FIG. 8 is a partial cross-sectional view of the display panel illustrated in FIG. 7.

Referring to FIG. 8, the display panel 60 includes a lower substrate 64 on which a plurality of TFTs 62 are formed, an upper substrate 68 on which a color filter layer 66 is formed, and the substrates 64. And a liquid crystal layer 70 injected between them. Polarizers 72 and 74 are attached to the upper surface of the upper substrate 68 and the lower surface of the lower substrate 64 to polarize light passing through the display panel 60.

Transparent pixel electrodes 76 controlled by TFTs 62 for each subpixel are positioned on the inner surface of the lower substrate 64, and transparent common electrodes 78 are positioned on the inner surface of the upper substrate 68. The color filter layer 66 includes a red filter layer 66R, a green filter layer 66G, and a blue filter layer 66B positioned one by one for each subpixel.

When the TFT 62 of a specific subpixel is turned on, an electric field is formed between the pixel electrode 76 and the common electrode 78, and the alignment angle of the liquid crystal molecules is changed by the electric field, and light is changed according to the changed arrangement angle. Permeability changes. The display panel 60 may control the luminance and the emission color of each pixel through this process.

In FIG. 7, reference numeral 80 denotes a gate circuit board assembly for transmitting a gate driving signal to the gate electrode of each TFT, and reference numeral 82 denotes a data circuit board assembly for transmitting a data driving signal to the source electrode of each TFT.

Referring to FIG. 7 again, the light emitting device 100 forms fewer pixels than the display panel 60 so that one pixel of the light emitting device 100 corresponds to two or more pixels of the display panel 60. Each pixel of the light emitting device 100 may emit light corresponding to the highest gray level among the grays of the plurality of pixels of the display panel 60 corresponding thereto, and represent gray levels of 2 to 8 bits.

For convenience, a pixel of the display panel 60 is called a first pixel, a pixel of the light emitting device 100 is called a second pixel, and first pixels corresponding to one second pixel are referred to as a first pixel group.

In the driving process of the light emitting device 100, a signal controller (not shown) that controls the display panel 60 detects the highest gray level among the gray levels of the first pixels constituting the first pixel group, and detects the second gray level. Calculate the gradation necessary for light emission of the second pixel according to the generated gradation, convert it to digital data, generate driving signals of the light emitting device 100 using digital data, and generate the generated driving signal to the light emitting device 100 It may include the step of applying to the drive electrode of).

The driving signal of the light emitting device 100 includes a scan driving signal and a data driving signal. One of the above-described cathode electrode and the gate electrode, for example, the gate electrode receives the scan driving signal, and the other electrode, for example the cathode electrode receives the data driving signal.

The scan circuit board assembly and the data circuit board assembly for driving the light emitting device 100 may be located on the rear surface of the light emitting device 100. In FIG. 7, reference numeral 84 denotes a first connection member connecting the cathode electrode and the data circuit board assembly, and reference numeral 86 designates a second connection member connecting the gate electrode and the scanning circuit board assembly. Reference numeral 88 denotes a third connecting member for applying an anode voltage to the anode electrode.

As described above, when the image is displayed in the corresponding first pixel group, the second pixel of the light emitting device 100 emits light with a predetermined gray level in synchronization with the first pixel group. That is, the light emitting device 100 provides light of high brightness in a bright area and light of low brightness in a dark area of a screen implemented by the display panel 60. Therefore, the display device 200 according to the present exemplary embodiment may increase the contrast ratio of the screen and implement more clear image 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.

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

FIG. 2 is an exploded perspective view illustrating the inside of an effective area of the light emitting device illustrated in FIG. 1.

3 is a graph showing an emission spectrum of a light emitting device measured under a condition that a fluorescent layer is not provided on a second substrate.

4 is a partial plan view illustrating a first fluorescent layer and a second fluorescent layer in the light emitting device of FIG. 1.

5 is a partial plan view of an electron emission unit of a light emitting device according to a second embodiment of the present invention.

FIG. 6 is a perspective view of the electron emission device illustrated in FIG. 5.

7 is an exploded perspective view of a display device according to an exemplary embodiment.

FIG. 8 is a partial cross-sectional view of the display panel illustrated in FIG. 7.

Claims (13)

A first substrate and a second substrate facing each other with the vacuum region interposed therebetween; Electron emission parts disposed on an inner surface of the first substrate; Drive electrodes positioned on an inner surface of the first substrate to control emission amounts of the electron emission units for each pixel; An anode located on an inner surface of the second substrate; First fluorescent layers formed on one surface of the anode at a distance from each other to correspond to the pixel regions, and are excited by electrons to emit light; And A second fluorescent layer disposed between the first fluorescent layers on one surface of the anode and excited by ultraviolet rays to emit light Light emitting device comprising a. The method of claim 1, Wherein the first fluorescent layer is a white phosphor mixed with a red phosphor, a green phosphor, and a blue phosphor. The method of claim 2, The red phosphor is any one selected from the group consisting of Y ₂ O ₃ : Eu, Y ₂ O ₂ S: Eu, SrTiO ₃ : Pr, and a combination thereof, and the green phosphor is Y ₂ SiO ₅ : Tb, Gd ₂ O ₂ S: Tb, ZnS: (Cu, Al), ZnSiO ₄ : Mn, Zn (Ga, Al) ₂ O ₄ : Mn, SrGa ₂ S ₄ : Eu, and combinations thereof The light emitting device of any one of the above, wherein the blue phosphor is any one selected from the group consisting of ZnS: (Ag, Al), Y ₂ SiO ₅ : Ce, BaMgAl ₁₀ O ₁₇ : Eu, and a combination thereof. The method of claim 3, Wherein the first fluorescent layer comprises 15 to 30 parts by weight of the red phosphor, 30 to 60 parts by weight of the green phosphor, and 24 to 45 parts by weight of the blue phosphor. The method of claim 1, The light emitting device of claim 2, wherein the second fluorescent layer is a phosphor that emits light by ultraviolet rays in a region of 380 to 490 nm. The method of claim 1, And the second fluorescent layer is a white phosphor in which a red phosphor, a green phosphor, and a blue phosphor are mixed. The method of claim 6, The red phosphor is (Y, Gd) BO ₃ : Eu, the green phosphor is Zn ₂ SiO ₄ : Mn, and the blue phosphor is BaMgAl ₁₀ O ₁₇ : Eu, CaMgSi ₂ O ₈ : Eu, BaMgAl ₁₀ O ₁₇ : The light emitting device of any one selected from the group consisting of Eu, CaMgSi ₂ O ₈ : Eu, and combinations thereof. The method of claim 7, wherein Wherein the second fluorescent layer comprises 15 to 30 parts by weight of the red phosphor, 30 to 60 parts by weight of the green phosphor, and 24 to 45 parts by weight of the blue phosphor. The method of claim 1, The light emitting device of claim 1, wherein the driving electrodes include cathode electrodes and gate electrodes that are orthogonal to each other with an insulating layer interposed therebetween, and at least one crossing area where the cathode electrodes and the gate electrodes overlap each other corresponds to the pixel area. The method of claim 1, The driving electrodes may include cathode electrodes and gate electrodes positioned to be parallel to the cathode electrode between the cathode electrodes, wherein the cathode and gate electrodes are respectively connected to the first connection part and the second connection part for each pixel area. A light emitting device electrically connected by. The light emitting device according to any one of claims 1 to 10; And Display panel located in front of the light emitting device Display device comprising a. The method of claim 11, The display panel forms first pixels, the light emitting device forms a smaller number of second pixels than the display panel, and each second pixel independently corresponds to a gray level of the first pixels corresponding to the display panel. Light emitting display device. The method of claim 11, A display device wherein the display panel is a liquid crystal display panel.

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