KR20080012494A - Light emitting device and liquid crystal display with the light emitting device as back light unit - Google Patents

Abstract

A light emitting device and a liquid crystal display device using the same are provided to improve a dynamic contrast of the LCD(Liquid Crystal Display) by independently controlling respective areas on a screen. A light emitting device includes a vacuum container, an electron emission unit(14), and a light emitting unit. The vacuum container includes first and second substrates(10,12) and a sealing member. The electron emission unit includes plural electron emitters, which are formed on the first substrate. Electron emission amounts of the electron emitters are controlled independently from one another. The light emitting unit is formed on the second substrate. The electron emitter(20) includes first electrodes, second electrodes, and first electron emitter portions. The first electrodes are formed along a cross direction of the first substrate. The second electrodes are arranged to be parallel to the first electrodes. The first electron portions are electrically connected to the first electrodes.

Description

LIGHT EMITTING DEVICE AND LIQUID CRYSTAL DISPLAY WITH THE LIGHT EMITTING DEVICE AS BACK LIGHT UNIT}

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

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

3 is an enlarged perspective view of the electron emission unit illustrated in FIG. 1.

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

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

6 is a partially enlarged cross-sectional view of a light emitting device according to a second embodiment of the present invention.

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

8 is a cross-sectional view taken along line II of FIG. 7.

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

10 is a cross-sectional view taken along the line II-II of FIG. 9.

11 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a light emitting device that emits light using an electron emission characteristic by an electric field, and a liquid crystal display device using the light emitting device as a backlight unit.

Recently, a liquid crystal display, which is one type of flat panel display, has been widely used in place of the cathode ray tube. The liquid crystal display has a feature of changing the amount of light transmission for each pixel by using dielectric anisotropy of a liquid crystal whose twist angle changes according to an applied voltage.

The liquid crystal display basically includes a liquid crystal panel assembly and a backlight unit that provides light to the liquid crystal panel assembly, and the liquid crystal panel assembly receives light emitted from the backlight unit and transmits or blocks the light by the action of the liquid crystal layer. The predetermined image is implemented.

The backlight unit may be classified according to the type of light source, and one of them is a cold cathode fluorescent lamp (CCFL). Since the CCFL is a linear light source, the light generated by the CCFL is evenly distributed toward the liquid crystal panel assembly through the optical members such as the diffusion sheet and the diffusion plate and the prism sheet.

However, in the CCFL method, since the light generated by the CCFL passes through the optical member, considerable light loss occurs, and power consumption is high because the light must be emitted at a high intensity from the CCFL in consideration of the light loss. In addition, the CCFL method is difficult to apply to a large display device of 30 inches or more because it is difficult to large area structure.

As a conventional backlight unit, a light emitting diode (LED) method is known. A plurality of LEDs are usually provided as a point light source, and are combined with optical members such as a reflective sheet, a light guide plate, a diffusion sheet, a diffusion plate, and a prism sheet to constitute a backlight unit. This LED method has the advantages of fast response speed and excellent color reproducibility, but has a disadvantage of high price and large thickness.

Accordingly, recently, a field emission type backlight unit that emits light using an electron emission characteristic by an electric field has been proposed as a backlight unit to replace the CCFL method and the LED method. The field emission type backlight unit is a surface light source, has the advantage of low power consumption, large size, and does not require a complicated optical member.

However, the conventional backlight units including the field emission backlight unit have a problem that it is difficult to meet the image quality improvement required for the liquid crystal display because the entire screen is always turned on at a constant brightness when driving the liquid crystal display.

For example, when the liquid crystal panel assembly displays an arbitrary screen including a high brightness portion and a low brightness portion according to an image signal, the backlight unit provides light of different intensities to the high brightness portion and the low brightness portion. If so, it is possible to realize a screen having excellent dynamic contrast.

However, the above-described backlight unit cannot implement the above functions, and thus the conventional liquid crystal display has a limitation in increasing the dynamic contrast ratio of the screen.

Accordingly, an object of the present invention is to solve the above problems, and an object of the present invention is to divide a screen into a plurality of areas and to independently control the light emission intensity for each divided area, and using the light emitting device as a backlight unit. An object of the present invention is to provide a liquid crystal display device capable of increasing the dynamic contrast ratio of a screen.

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

An electron emitting unit comprising a vacuum container including a first substrate, a second substrate, and a sealing member, and a plurality of electron emitting elements provided on opposite surfaces of the first substrate with a second substrate, the electron emission amount being independently controlled And a light emitting unit positioned on an opposite surface of the second substrate to the first substrate, wherein each electron emission device is formed along one direction of the first substrate, and between the first electrodes. A light emitting device includes second electrodes positioned to be parallel to a first electrode, and first electron emission parts electrically connected to the first electrodes.

The electron emission device may further include second electron emission parts electrically connected to the second electrodes. The first electron emitters may be positioned at the side of the first electrode along the length direction of the first electrode, and the second electron emitters may be positioned at the side of the second electrode along the length direction of the second electrode. .

The first electrodes may be connected to the first connection part at one end of each of the electron emission devices, and the second electrodes may be connected to the second connection part at one end of the opposite electron.

The electron emitting device includes a first wiring part drawn out from the first connection part to the edge of the first substrate, and a second wiring part drawn out from the second connection part to the edge of the first substrate. The first wiring portions may be drawn out to one side edge of the first substrate in one direction of the first substrate, and the second wiring portions may be drawn out to one side edge opposite to the first substrate in the one direction.

An insulating layer may be formed between the first substrate and the electron emission devices to cover the first wiring portions and the second wiring portions. At this time, the insulating layer forms a pair of via holes exposing a part of the first wiring part and the second wiring part for each electron emission element, and fills the via hole, between the first wiring part and the first connection part, and the second wiring part. A conductive layer may be formed between the second connection portion and the second connection portion.

On the other hand, the electron emitting device includes a first wiring portion for connecting with first connecting portions of the electron emitting devices arranged along one direction of the first substrate, and an electron emitting device arranged along a direction orthogonal to the one direction It may include a second wiring portion for connecting with the second connection portions of the. An anti-conduction film may be formed between the first wiring part and the second wiring part in an area where the first wiring part and the second wiring part cross each other.

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

A liquid crystal display device including a light emitting device having the above-described structure and a liquid crystal panel assembly positioned in front of the light emitting device to receive light emitted from the light emitting device to display an image.

The liquid crystal panel assembly forms a plurality of pixels along the row direction and the column direction, and the light emitting device forms a smaller number of pixels than the liquid crystal panel assembly along the row direction and the column direction. The number of pixels of the light emitting device in the row direction and the number of pixels of the light emitting device in the column direction may be defined as any one of 2 to 99.

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 partially exploded perspective view of a light emitting device according to a first embodiment of the present invention, and FIG. 2 is a partial plan view of an electron emission unit in the light emitting device according to the first embodiment of the present invention.

1 and 2, the light emitting device of the present embodiment includes a first substrate 10 and a second substrate 12 that are disposed to face each other in parallel at a predetermined interval. Sealing members (not shown) are disposed at the edges of the first substrate 10 and the second substrate 12 to bond the two substrates, and the internal space is evacuated with a vacuum of approximately 10 ⁻⁶ Torr to form the first substrate 10. ), The second substrate 12 and the sealing member constitute a vacuum container.

The first substrate 10 and the second substrate 12 may be divided into an effective region contributing to the actual visible light emission and an ineffective region surrounding the effective region. An electron emission unit 14 for emitting electrons using an electric field is provided in the effective area of the first substrate 10, and the light emitting unit 16 for emitting visible light by the electron in the effective area of the second substrate 12. This is provided.

In the present embodiment, the electron emission unit 14 is composed of a plurality of electron emission elements 20, and each electron emission element 20 is independently controlled in the amount of electron emission.

3 is an enlarged perspective view of the electron emission unit illustrated in FIG. 1, and FIG. 4 is a partially enlarged cross-sectional view of the light emitting device according to the first embodiment of the present invention.

3 and 4, the electron emission device 20 may include first electrodes 22 formed in a stripe pattern along one direction (the x-axis direction of the drawing) of the first substrate 10, and each of the first and second electrodes 22 may be formed in a stripe pattern. The first electrode 22 includes second electrodes 24 positioned parallel to the first electrode 22, and electron emission parts 26 electrically connected to the first electrode 22.

The first electrode 22 functions as a cathode electrode for supplying current to the electron emission section 26, and the second electrode 24 forms an electric field around the electron emission section 26 due to the voltage difference from the cathode electrode. Function as a gate electrode to induce electron emission.

The first electrodes 22 and the second electrodes 24 are alternately arranged one by one on the same plane, and opposite ends of the first electrodes 22 and the second electrodes 24 are connected to the respective connection parts to receive the corresponding driving voltages. Referring to FIG. 3, the first electrodes 22 have, for example, a left end thereof connected to the first connection part 28, and the second electrodes 24 have an opposite one end, that is, a second right end thereof. It is connected to the connection part 30.

The first electrodes 22 and the second electrodes 24 may be formed of a transparent electrode such as indium tin oxide (ITO), or may have a structure in which a transparent electrode and a metal auxiliary electrode are stacked. In both cases, since the first electrodes 22 and the second electrodes 24 are positioned at the same height, the two electrodes may be simultaneously formed in one patterning process, thereby simplifying the manufacturing process.

The electron emission part 26 is provided at both edges of the first electrode 22 along the length direction of the first electrodes 22, and is spaced apart from the second electrode 24 at a predetermined distance so that a short circuit does not occur. do. The electron emission part 26 may be formed to contact the side surface of the first electrode 22, or may be positioned to cover the entire side surface and a portion of the upper surface of the first electrode 22. In the figure, the first case is illustrated.

The electron emission unit 26 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 (nm) size material. The electron emission unit 26 may include, for example, a material selected from the group consisting of carbon nanotubes, graphite, graphite nanofibers, diamonds, diamond-like carbons, fullerenes (C ₆₀ ), silicon nanowires, and combinations thereof. Screen printing, direct growth, chemical vapor deposition or sputtering may be applied to the preparation method.

Referring again to FIGS. 1 and 2, the electron emission devices 20 having the above-described configuration are positioned side by side at an arbitrary distance from each other in the effective area of the first substrate 10. In addition, wiring portions for applying a driving voltage to the first connection portion 28 and the second connection portion 30 of each electron emission element 20 are positioned between the electron emission elements 20.

Each electron emission element 20 includes a first wiring portion 32 connected to the first connection portion 28 and a second wiring portion 34 connected to the second connection portion 30. In the present embodiment, the first wiring portions 32 and the second wiring portions 34 are located along the same direction, but are drawn to the opposite edges of the first substrate 10 and corresponding driving circuit portions (not shown) at the edges thereof. Is electrically connected to the

In FIG. 2, the first wiring portions 32 are drawn to the lower edge of the first substrate 10 along the y-axis direction of the drawing at an arbitrary distance from each other, and the second wiring portions 34 are separated from each other. The configuration of drawing out the upper edge of the first substrate 10 along the y-axis direction of the drawing at a distance is illustrated.

1 and 4, the light emitting unit 16 includes a fluorescent layer 36 and an anode electrode 38 positioned on one surface of the fluorescent layer 36. The fluorescent layer 36 may be formed of a white fluorescent layer or a combination of red, green, and blue fluorescent layers. In the drawing, a white fluorescent layer is positioned in the entire effective region of the second substrate 12.

The anode electrode 38 may be formed of a metal film such as aluminum (Al) covering the surface of the fluorescent layer 36. The anode 38 is an acceleration electrode that attracts an electron beam to maintain the fluorescent layer 36 in a high potential state by applying a high voltage, and is radiated toward the first substrate 10 of the visible light emitted from the fluorescent layer 36. The visible light is reflected toward the second substrate 12 to increase the brightness of the screen.

In addition, spacers (not shown) are disposed between the first substrate 10 and the second substrate 12 to support the compressive force applied to the vacuum container and to keep the distance between the two substrates constant.

The light emitting device having the above-described configuration is driven by supplying a predetermined voltage to the first wiring portions 32, the second wiring portions 34, and the anode electrode 38 from outside the vacuum container. In this case, the anode electrode 38 is applied with a DC voltage of a quantity of several thousand volts, and the driving voltage is selectively applied to the first wiring portions 32 and the second wiring portions 34 to be turned on / off for each electron emission element 20. Independently control the amount of off and electron emission.

For example, when voltages having different magnitudes are applied to the first wiring part 32 and the second wiring part 34 with respect to any one of the electron emission devices 20, the first electrode 22 and the second electrode 24 are applied. An electric field is formed around the electron emission section 26 by the voltage difference of the electrons, and electrons (denoted by e ⁻ in FIG. 4) are emitted therefrom, and the emitted electrons are attracted to the anode voltage to correspond to the corresponding fluorescent layer 36. It strikes the site and emits light.

In this process, the cathode voltage applied to the first electrode 22 may be set in the range of 0V or several to several tens of volts, and the gate voltage applied to the second electrode 24 may be in the range of several to several tens of volts greater than the cathode voltage. Can be set. Meanwhile, the electron emitters 26 belonging to one electron emitter 20 emit electrons at the same time. However, in FIG. 4, the electron emitters 26 of the electron emitter 26 are shown for convenience.

As described above, the light emitting device of the present exemplary embodiment may divide the light emitting surface into a plurality of regions according to the number of the electron emission elements 20 by the above-described structure and driving method, and emit visible light having different intensities for each divided region. Therefore, the light emitting device of this embodiment effectively contributes to increasing the dynamic contrast ratio of the liquid crystal display when functioning as a backlight unit in the liquid crystal display described below.

5 is a plan view of an electron emission unit of a light emitting device according to a second embodiment of the present invention, and FIG. 6 is a partially enlarged cross-sectional view of the light emitting device according to the second embodiment of the present invention.

5 and 6, in the present exemplary embodiment, the electron emission devices 20 ′ may include first electrodes 22 formed in a stripe pattern along one direction (the x-axis direction of the drawing) of the first substrate 10. ), Second electrodes 24 positioned in parallel with the first electrode 22 between each first electrode 22, and first electron emission parts electrically connected to the first electrodes 22. 26, and second electron emission parts 40 electrically connected to the second electrode 24.

One end of the first electrodes 22 is connected to the first connector 28, and the other end of the second electrodes 24 is connected to the second connector 30. The first electrode 22 and the second electrode 24 function as one of the cathode electrode and the gate electrode according to the applied voltage. In addition, a driving method of repeatedly inputting a cathode voltage and a gate voltage to the first electrode 22 and the second electrode 24 may be applied.

That is, a cathode voltage is applied to the first electrodes 22 and a gate voltage is applied to the second electrodes 24 for a time t1. Thereafter, a gate voltage is applied to the first electrodes 22 and a cathode voltage is applied to the second electrodes 24 for a time t2. Then, in the t1 section, the first electron emission units 26 provided to the first electrode 22 emit electrons (denoted by e ⁻ (1) in FIG. 6) to emit the fluorescent layer 36. The second electron emitting portions 40 provided to the second electrode 24 emit electrons (denoted by e ⁻ 2 in FIG. 6) to emit the fluorescent layer 36.

By repeatedly driving the above-described t1 section and t2 section, electrons may be alternately drawn from the first electron emitter 26 and the second electron emitter 40. In this driving method, since the load applied to the first electron emission unit 26 and the second electron emission unit 40 is reduced, the life characteristics of the first and second electron emission units 26 and 40 may be improved.

7 is a partial plan view of an electron emission unit of a light emitting device according to a third exemplary embodiment of the present invention, and FIG. 8 is a cross-sectional view taken along line II of FIG. 7.

7 and 8, the electron emission unit 14 ′ of the present embodiment has an insulating layer between the first substrate 10 and the electron emission elements 20 based on the configuration of the first embodiment described above. 42) provides a structure in which to locate. The insulating layer 42 covers the first and second wiring portions 32 and 34 in the effective region of the first substrate 10 so that the wiring portions 32 and 34 are not exposed toward the second substrate.

More specifically, the first wiring portions 32 and the second wiring portions 34 are positioned at an arbitrary distance from each other on the first substrate 10, and the insulating layer 42 is formed of the first and second wiring portions ( 32 and 34 are formed on the first substrate 10. On the insulating layer 42, the electron emission units 20 are located side by side at a distance from each other.

In the insulating layer 42, a via hole 421 is formed in each electron emission element 20 near the first connection part 28 to expose the first wiring part 32, and the conductive layer 44 is a via hole. The first wiring part 32 and the first connection part 28 are electrically connected to each other by contacting the first connection part 28 while filling the 421. In the same manner, the second connection part 30 is also electrically connected to the corresponding second wiring part 34 through the via hole 421 and the conductive layer 44.

9 is a partial plan view of an electron emission unit of a light emitting device according to a fourth exemplary embodiment of the present invention, and FIG. 10 is a cross-sectional view taken along the line II-II of FIG. 9.

9 and 10, the electron emission unit 14 "of this embodiment has the structure of the 1st embodiment mentioned above, and the 1st wiring part 32 'and the 2nd wiring part 34' mutually differ from each other. Provided is a structure located in orthogonal directions.

More specifically, the first wiring parts 32 ′ are formed along one direction (y-axis direction of the drawing) of the first substrate 10 and are first connecting parts of the electron emission device 20 positioned along this direction. Connect (28). The second wiring parts 34 ′ are formed along a direction orthogonal to the one direction (the x-axis direction of the drawing) and connect the second connecting parts 30 of the electron emission device 20 positioned along this direction. Let's do it.

In the region where the first wiring portion 32 'and the second wiring portion 34' intersect, the first and second wiring portions 32 are interposed between the first wiring portion 32 'and the second wiring portion 34'. An anti-conduction film 46 having a width greater than ', 34' is formed so that the first wiring part 32 'and the second wiring part 34' are not short-circuited. In the drawings, an example in which the anti-conducting film 46 and the second wiring part 34 'are positioned on the first wiring part 32' is vice versa.

In the above-described structure, the first and second wiring parts common to each line of the electron emission device 20 are not formed separately from the first wiring part 32 ′ and the second wiring part 34 ′ for each of the electron emission devices 20. By forming (32 ', 34'), there is an advantage of simplifying the structure of the first and second wiring portions 32 ', 32' while reducing the effective area between the electron emission elements 20.

In the above-described third and fourth embodiments, the electron emission devices 20 may be replaced with the electron emission device 20 'structure of the second embodiment.

11 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention using the light emitting device having the above-described configuration as a backlight unit.

Referring to FIG. 11, the liquid crystal display device 50 according to the present exemplary embodiment includes a liquid crystal panel assembly 52 forming a plurality of pixels in a row direction and a column direction, and is positioned behind the liquid crystal panel assembly 52 to be positioned behind the liquid crystal panel assembly. Light-emitting device 54 that provides light to 52. Hereinafter, for convenience, the light emitting device 54 will be referred to as a backlight unit.

Any known liquid crystal panel assembly may be applied to the liquid crystal panel assembly 52, and the backlight unit 54 is formed of any one of the light emitting devices of the first to fourth embodiments described above. An optical member (not shown) such as a diffusion plate or a diffusion sheet may be disposed between the liquid crystal panel assembly 52 and the backlight unit 54 as necessary.

The row direction may be defined as one direction of the liquid crystal display 50, for example, a horizontal direction (x-axis direction of the drawing) of the screen implemented by the liquid crystal panel assembly 52, and the column direction may be defined as the liquid crystal display 50. ) May be defined as a vertical direction (y-axis direction of the drawing) of the screen implemented by the liquid crystal panel assembly 52.

In the present exemplary embodiment, the backlight unit 54 forms a smaller number of pixels than the liquid crystal panel assembly 52 along the row direction and the column direction so that one pixel of the backlight unit 54 includes a plurality of pixels of the liquid crystal panel assembly 52. To respond. Here, the pixel of the backlight unit 54 refers to an area corresponding to one electron emission device.

If the number of pixels of the liquid crystal panel assembly 52 in the row direction and the number of pixels of the liquid crystal panel assembly 52 in the column direction are M and N, respectively, M and N may be defined as an integer of 240 or more. If the number of pixels of the backlight unit 54 in the row direction and the number of pixels of the backlight unit 54 in the column direction are M 'and N', respectively, M 'and N' are any integer of 2 to 99. Can be defined as

The backlight unit 54 is a kind of self-luminous display panel having a resolution of M '× N', and the light emission intensity is independently controlled for each pixel to provide light of predetermined luminance to the pixels of the liquid crystal panel assembly 52 corresponding to each pixel. to provide.

In this case, 2, which is the minimum value of M 'and N', is the minimum basic condition under which the backlight unit 54 of the present embodiment may be a display panel. In addition, if the resolution of the backlight unit 54 exceeds 99 × 99, the driving of the backlight unit 54 may be complicated and a cost increase for manufacturing a driving circuit may be caused. Therefore, 99, which is the maximum value of M 'and N', is a backlight unit. The numerical value in consideration of the functionality (54) and the ease of manufacture of (54).

The backlight unit 54 having the above-described configuration emits light of an appropriate intensity according to the luminance of the pixels of the liquid crystal panel assembly 52 corresponding to each pixel (hereinafter, referred to as 'pixel group' for convenience).

In the driving process of the backlight unit 54, a backlight unit controller (not shown) generates luminance information for each pixel of the backlight unit 54 from an image signal of one frame of the liquid crystal panel assembly 52, and generates the luminance information. And a driving signal of the electron emitting device, wherein the electron emitting device emits a predetermined amount of electrons in accordance with the corresponding driving signal so that the fluorescent layer emits visible light having an intensity corresponding to the electron emission amount. At this time, it is preferable to drive each pixel of the backlight unit 54 so that a gray level representation of 2 to 8 bits can be expressed.

Therefore, the liquid crystal display device 50 according to the present exemplary embodiment may improve dynamic contrast of the screen and realize more sharp 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.

The light emitting device according to the present invention can divide the screen of the light emitting device into a plurality of areas and control the light emission intensity independently for each divided area, thereby increasing the dynamic contrast ratio of the liquid crystal display device and providing a clearer picture quality. Can be. In addition, the liquid crystal display according to the present invention using the above-described light emitting device as a backlight unit can reduce the power consumption of the backlight unit to lower the overall power consumption, and can be easily manufactured with a large display device of 30 inches or more.

Claims (17)

A vacuum container including a first substrate, a second substrate, and a sealing member; An electron emission unit comprising a plurality of electron emission elements provided on an opposing surface of the first substrate with the second substrate and whose electron emission amount is independently controlled; And The light emitting unit is located on the surface facing the first substrate of the second substrate Including, Each of the electron-emitting devices, First electrodes formed along one direction of the first substrate; Second electrodes positioned to be parallel to the first electrode between the first electrodes; And First electron emitters electrically connected to the first electrodes Light emitting device comprising a. The method of claim 1, The light emitting device of claim 2, wherein the electron emission device further comprises second electron emission parts electrically connected to the second electrodes. The method of claim 2, And the first electron emitters and the second electron emitters include at least one of a carbonaceous material and a nanometer sized material. The method of claim 2, The first electron emission parts are positioned at the side of the first electrode along the length direction of the first electrode, The light emitting device of claim 2, wherein the second electron emission parts are positioned at a side surface of the second electrode along a length direction of the second electrode. The method of claim 2, And the first electrodes and the second electrodes alternately perform a function of a cathode electrode and a gate electrode. The method of claim 1, The light emitting device of claim 1, wherein the first electrodes are connected to the first connection part at one end of each of the electron emission devices, and the second electrodes are connected to the second connection part at one end of the opposite electrode. The method of claim 6, Each of the electron-emitting devices, A first wiring portion drawn out from the first connection portion to an edge of the first substrate; And a second wiring portion drawn out from the second connection portion to an edge of the first substrate. The method of claim 7, wherein The plurality of first wiring parts are led to one side edge of the first substrate in one direction of the first substrate, The light emitting device of claim 2, wherein the plurality of second wiring parts are led to one side edge opposite to the first substrate along the one direction. The method of claim 8, And an insulating layer formed between the first substrate and the electron emission devices to cover the first wiring portions and the second wiring portions. The method of claim 9, The insulating layer forms a pair of via holes exposing a part of the first wiring part and the second wiring part for each of the electron emission devices; And a conductive layer formed between the first wiring part and the first connection part and between the second wiring part and the second connection part while filling the via hole. The method of claim 6, The electron emitting device, A first wiring portion for connecting with first connection portions of the electron emission elements arranged along one direction of the first substrate; And a second wiring portion for connecting with second connection portions of the electron emission elements arranged along a direction orthogonal to the one direction. The method of claim 11, And an anti-conduction film positioned between the first wiring part and the second wiring part in a region where the first wiring part and the second wiring part intersect. The method of claim 1, The light emitting unit, A fluorescent layer formed on one surface of the second substrate; And A light emitting device comprising an anode of a metal formed on the surface of the fluorescent layer. The light emitting device according to any one of claims 1 to 13; And A liquid crystal panel assembly positioned in front of the light emitting device to receive light emitted from the light emitting device to display an image Liquid crystal display comprising a. The method of claim 14, The liquid crystal panel assembly forms a plurality of pixels in a row direction and a column direction, And the light emitting device forms a smaller number of pixels than the liquid crystal panel assembly along the row direction and the column direction. The method of claim 15, And a pixel number of the liquid crystal panel assembly in the row direction and a pixel number of the liquid crystal panel assembly in the column direction is an integer of 240 or more. The method of claim 16, And a number of pixels of the light emitting device in the row direction and a number of pixels of the light emitting device in the column direction is any one of 2 to 99.

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