KR20100060166A - Lamp, method for manufacturing the same and liquid crystal display device having the same - Google Patents

Abstract

The lamp includes a tube, an electrode body, and an emitter surface metal layer. The tube forms a light emitting space. The cup-shaped electrode body is disposed inside the tube. The emitter surface metal layer includes an alkali metal oxide or an alkali earth metal oxide covering the electrode body. The emitter surface metal layer is at least one selected from beryllium oxide (BeO), magnesium oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), barium oxide (BaO), cesium oxide (CsO), and radium oxide (RaO). It includes, and includes cesium (Cs). Therefore, the discharge tends to occur in accordance with the secondary electrons, so that the luminous efficiency increases and the dark starting characteristic can be improved.

Description

Lamp, manufacturing method thereof, and liquid crystal display having same {LAMP, METHOD FOR MANUFACTURING THE SAME AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME}

The present invention relates to a lamp, a manufacturing method thereof and a liquid crystal display device having the same. More particularly, the present invention relates to a lamp for reducing power consumption, a manufacturing method thereof, and a liquid crystal display device having the same.

The liquid crystal display device used in a liquid crystal display or a liquid crystal television of a computer has a backlight unit disposed on the back, and a cold cathode fluorescent lamp is generally used as a light source of the backlight unit. This cold cathode fluorescent lamp is generally used as a fluorescent lamp for general lighting. Compared to its smaller diameter, it consumes less power and at the same time has a high luminance and uniformity and a long life.

Electrons are emitted from electrodes at both ends of the cold cathode fluorescent lamp to excite mercury, and when the mercury is excited, ultraviolet rays are emitted, and the ultraviolet rays are converted into visible light by the phosphor.

Conventionally, cesium (Cs) was coated on the electrodes of a cold cathode fluorescent lamp to improve the dark starting characteristic. At this time, cesium (Cs) was coated on the electrodes of the fluorescent lamp in the form of an aqueous solution. However, the cesium (Cs) aqueous solution contained water molecules and could not additionally coat metals that could increase electron emission efficiency.

That is, since the coating of the cesium (Cs) with water molecules and metals that can increase the electron emission efficiency causes problems such as light flicker, additional coating is not possible, and thus, the luminous efficiency of the cold cathode fluorescent lamp is low. .

Therefore, the technical problem of the present invention was conceived in this respect, an object of the present invention is to provide a lamp that can reduce the power consumption by increasing the efficiency of the electrode.

Another object of the present invention is to provide a method of manufacturing the lamp.

Still another object of the present invention is to provide a liquid crystal display panel including the lamp.

In order to achieve the above object of the present invention, a lamp according to an embodiment includes a tube, an electrode body, an emitter surface metal layer. The tube forms a light emitting space. The cup-shaped electrode body is disposed inside the tube. The emitter surface metal layer includes an alkali metal oxide or an alkali earth metal oxide covering the electrode body.

In an embodiment of the present invention, the emitter surface metal layer is beryllium oxide (BeO), magnesium oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), barium oxide (BaO), cesium oxide (CsO), acid It may include one or more selected from radium (RaO), and may include cesium (Cs).

In an embodiment of the present disclosure, the emitter surface metal layer may include an emitter metal layer of a metal oxide material covering the electrode body and a surface metal layer of a metal material covering the emitter metal layer.

In an embodiment of the present invention, the emitter metal layer is beryllium oxide (BeO), magnesium oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), barium oxide (BaO), cesium oxide (CsO), radium oxide It may include one or more selected from (RaO). The surface metal layer may include cesium (Cs).

In an embodiment of the present invention, the emitter surface metal layer may include a surface metal layer of a metal material covering the electrode body and an emitter metal layer of a metal oxide material covering the surface metal layer.

In an embodiment of the present invention, the electrode body is at least one selected from nickel (Ni), molybdenum (Mo), niobium (Nb), tungsten (W), titanium (Ti), tantalum (Ta), iron (Fe). It may include.

In order to achieve the above object of the present invention, according to the lamp manufacturing method according to an embodiment, the phosphor is applied to the tube formed with the light emitting space. Subsequently, the electrode metal plate is processed to form an electrode body in the form of an electrode cup. Subsequently, a metal material including an alkali metal oxide or an alkali earth metal oxide is vaporized to form an emitter surface metal layer on the electrode body. Subsequently, the electrode body on which the emitter surface metal layer is formed is disposed on the tube.

In an embodiment of the present invention, the metal material may be vaporized and deposited in an electron beam evaporator.

In an embodiment of the present invention, the metal material may include cesium (Cs) and a metal oxide material including an oxide. The metal oxide material may be at least one selected from beryllium oxide (BeO), magnesium oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), barium oxide (BaO), cesium oxide (CsO), and radium oxide (RaO). It may include.

In an embodiment of the present invention, in the forming of the emitter surface metal layer, the metal oxide material and the cesium (Cs) may be simultaneously vaporized and deposited on the electrode body.

In an embodiment of the present invention, the forming of the emitter surface metal layer may include forming an emitter metal layer on the electrode body by vaporizing the metal oxide material and vaporizing the cesium (Cs) to surface the emitter metal layer. Forming a metal layer may be included.

In an embodiment of the present invention, the forming of the emitter surface metal layer may include forming a surface metal layer on the electrode body by vaporizing the cesium (Cs), and vaporizing the metal oxide material to emitter metal layer on the surface metal layer. It may include forming a.

In order to achieve the another object of the present invention described above, the liquid crystal display device according to the embodiment includes a liquid crystal display panel, a lamp and an inverter. The lamp includes a tube forming a light emitting space, an electrode body disposed inside the tube, and an emitter surface metal layer including an alkali metal oxide or an alkaline earth metal oxide covering the electrode body. To provide light. The inverter supplies power to the plurality of lamps.

In an embodiment of the present invention, the emitter surface metal layer is beryllium oxide (BeO), magnesium oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), barium oxide (BaO), cesium oxide (CsO), oxide One or more oxides selected from radium (RaO) and cesium (Cs) may be included.

In an embodiment of the present invention, the emitter surface metal layer may include the oxide, the emitter metal layer covering the electrode body and the cesium (Cs), and may include a surface metal layer covering the emitter metal layer. .

In an embodiment of the present invention, the emitter surface metal layer may include the cesium (Cs), the surface metal layer covering the electrode body and the oxide, and the emitter metal layer covering the emitter metal layer. .

In an embodiment of the present invention, the emitter surface metal layer may be a mixture of the oxide and the cesium (Cs).

According to such a lamp, a manufacturing method thereof, and a liquid crystal display device having the same, since the electrode of the lamp includes a metal having good electron emission efficiency, the temperature of the lamp electrode is reduced and the efficiency of the lamp is increased. Therefore, the power consumption of the lamp can be reduced and the power consumption of the liquid crystal display including the lamp can be reduced.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. Like reference numerals are used for like elements in describing each drawing. In the accompanying drawings, the dimensions of the structures are shown in an enlarged scale than actual for clarity of the invention. The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof. In addition, when a part of a layer, a film, an area, a plate, or the like is directly above another part, this includes not only being directly above another part but also having another part in the middle. Conversely, if a part of a layer, film, region, plate, etc. is under another part, this includes not only the part directly under another part but also another part in the middle.

Example 1

1 is an exploded perspective view schematically showing a liquid crystal display according to a first embodiment of the present invention.

Referring to FIG. 1, a liquid crystal display according to an exemplary embodiment of the present invention may include a liquid crystal display panel 100, a panel driver 200, a backlight assembly BL, a mold frame 660, a top chassis 700, and a bottom. And chassis 800.

The display panel 100 receives light from the backlight assembly BL to display an image. The display panel 100 includes a first substrate 110 and a second substrate 120 which are bonded to each other with a liquid crystal layer (not shown) for controlling the amount of light transmission therebetween.

The panel driver 200 drives the display panel 100 to display an image. To this end, the panel driver 200 is a driving integrated circuit 210 mounted on the signal transmission substrate 220 and a drive for supplying power and various signals to the display panel 100 through the signal transmission substrate 220. Circuit board 230.

The backlight assembly BL is positioned under the display panel 100 to supply light to the display panel 100. To this end, the backlight assembly BL includes a lamp 300, a lamp socket 610, a reflective member 630, an optical sheet 650, a mold frame 660 and a side mold 640.

The lamp 300 generates light for supplying the display panel 100.

The lamp socket 610 is disposed at both ends of the lamp 300 to fix the lamp 300, to apply power to the lamp 300, and to ground the lamp 300. The lamp socket 610 may be stored in the socket housing 620.

The reflective member 630 is formed under the lamp 300 to reflect the light emitted to the lower side of the lamp 300 to the upper side of the lamp 300 to reduce the light loss. To this end, the reflective member 630 is formed of a plate or sheet having a high light reflectance.

The optical sheet 650 is composed of a diffusion sheet 651, a prism sheet 652, a protective sheet 653, and the like. The diffusion sheet 651 diffuses the light emitted from the lamp 300 to be incident on the display panel 100 evenly. The prism sheet 652 condenses the light diffused by the diffusion sheet 651 perpendicularly to the display panel 100. The protective sheet 653 protects the prism sheet 652 so that scratches such as scratches do not occur in the prism sheet 652. 2 to 3 of the optical sheet 650 may be selectively used according to the characteristics of the display device.

The side mold 640 is formed with a lamp groove 645 surrounding the lamp 300 to fix the lamp 300. In addition, the side mold 640 is formed at a predetermined height to support the optical sheet 650, and spaced apart the lamp 300 from the optical sheet 650 by a predetermined interval. Here, the side mold 640 may be formed with a step portion for receiving the optical sheet 650.

The mold frame 660 accommodates the display panel 100 and externally impacts the display panel 100, the lamp 300, the lamp socket 610, the reflective member 630, and the optical sheet 650. Protect from To this end, the mold frame 660 is formed of a mold injection product such as plastic.

The top chassis 700 is disposed above the display panel 100, and protects the display panel 100 and the backlight assembly BL from external shock. The top chassis 700 is opened in the center to expose the display area of the display panel 100 to surround the outer edge of the display panel 100.

The bottom chassis 800 is disposed under the backlight assembly BL to accommodate the backlight assembly BL. The display device according to an exemplary embodiment of the present invention further includes an inverter 900 for supplying power to the lamp 300, and a protection cover 910 for protecting the inverter 900 and the lamp socket 610. Include. The inverter 900 is mounted on the bottom of the bottom chassis 800 and is connected to the lamp socket 610 to supply power. The protective cover 910 is fastened to the bottom of the bottom chassis 800 to protect the inverter 900 connected to the lamp socket 610 from external shock. For example, the protective cover 910 may be formed of a plastic material to electrically and physically protect the inverter 900.

FIG. 2 is a cross-sectional view illustrating a lamp 300 included in the liquid crystal display shown in FIG. 1.

1 and 2, the lamp 300 includes a tube 310, a first electrode P11, and a second electrode P21. Between the first electrode P11 and the second electrode P21 will be referred to as the center (M) of the lamp.

A predetermined amount of a mixed gas 380 of mercury, argon and neon is formed in the light emitting space 370 of the tube 310. A fluorescent material 360 is coated on the outer wall of the tube 310, and a small amount of alumina may be added to the fluorescent material 360 to improve initial startup. First and second electrodes P11 and P21 are formed at both ends of the tube 310.

When voltage is applied to the first and second electrodes P11 and P21, electron emission from the first and second electrodes P11 and P21 is caused by an electric field. Here, heat is not necessary because electron emission is made by an electric field rather than by heat. Electrons are emitted to excite mercury, and when the mercury is excited, ultraviolet rays are emitted, and the ultraviolet rays are converted into visible light.

Specifically, when a voltage is applied to the first and second electrodes P11 and P21 of the lamp 300, electrons in the tube 310 flow at high speed to the first and second electrodes P11 and P21. ) Is discharged by the secondary electrons generated by the collision of the accelerated electrons or cations on the surface of the first and second electrodes (P11, P21). Electrons emitted from the first and second electrodes P11 and P21 collide with mercury atoms, and ultraviolet rays are emitted due to the collision, and the ultraviolet rays convert the phosphor into visible light.

The first electrode P11 includes a first lamp lead 320a, a first electrode body 330a, a first emitter surface metal layer 340a, and a first bead glass 350a.

The first lamp lead 320a is connected to the lamp socket 610 to receive a voltage from the inverter 900.

The first electrode body 330a uses a metal material having good conductivity. The first electrode body 330a includes at least one selected from nickel (Ni), molybdenum (Mo), niobium (Nb), tungsten (W), titanium (Ti), tantalum (Ta), and iron (Fe). can do.

The first emitter surface metal layer 340a includes a first emitter metal layer 341a and a first surface metal layer 343a.

The first emitter metal layer 341a uses a metal material of an oxide having good electron emission efficiency. Here, the oxide may be an alkali metal oxide or an alkaline earth metal oxide. The first emitter metal layer 341a includes beryllium oxide (BeO), magnesium oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), barium oxide (BaO), cesium oxide (CsO), and radium oxide (RaO). It may include one or more selected from). Specifically, the first emitter metal layer 341a is made of an electron emitting material having a high secondary electron emission coefficient. Therefore, when a voltage is applied to the first electrode P11, secondary electrons are emitted from the first electrode P11 to actively discharge in the light emitting space. As a result, the discharge start voltage is lowered and the luminous efficiency is also increased. In addition, the heat generated during driving is reduced to increase the stability of the lamp 300.

The first surface metal layer 343a uses a metal material capable of improving the black-start characteristic of the lamp 300. The first surface metal layer 343a may include cesium (Cs). Specifically, cesium (Cs) is an electron radioactive material having a high secondary electron emission coefficient, and thus, dark starting characteristics can be improved because discharge is likely to occur according to secondary electrons emitted from cesium (Cs).

The first bead glass 350a is formed to surround the first lamp lead 320a. The first bead glass 350a protects the tube 310 from the impact that the tube 310 is subjected to by the expansion and contraction of the first lamp lead 320a.

The second electrode P21 includes a second lamp lead 320b, a second electrode body 330b, a second emitter surface metal layer 340b, and a second bead glass 350b.

The second lamp lead 320b is connected to the lamp socket 610 and grounded. The second lamp lead 320b may be connected to the inverter 900 to receive a voltage from the inverter 900.

The second electrode body 330b uses a metal material having good conductivity. The second electrode body 330b includes at least one selected from nickel (Ni), molybdenum (Mo), niobium (Nb), tungsten (W), titanium (Ti), tantalum (Ta), and iron (Fe). can do.

The second emitter surface metal layer 340b includes a second emitter metal layer 341b and a second surface metal layer 343b.

The second emitter metal layer 341b uses a metal material of an oxide having good electron emission efficiency. The second emitter metal layer 341b includes beryllium oxide (BeO), magnesium oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), barium oxide (BaO), cesium oxide (CsO), and radium oxide (RaO). It may include one or more selected from). Specifically, the second emitter metal layer 341b is usually made of an electron emitting material having a high secondary electron emission coefficient. Therefore, when voltage is applied to the second electrode P21, secondary electrons are emitted from the second electrode P21 to actively discharge in the light emitting space. As a result, the discharge start voltage is lowered and the luminous efficiency is also increased. In addition, the heat generated during driving is reduced to increase the stability of the lamp 300.

The second surface metal layer 343b uses a metal material capable of improving the black-start characteristic of the lamp 300. The first surface metal layer 343a may include cesium (Cs). Specifically, cesium (Cs) is an electron-radioactive material having a high secondary electron emission coefficient, and thus, dark starting characteristics can be improved because discharge tends to occur according to secondary electrons emitted from cesium (Cs).

The second bead glass 350b is formed to surround the second lamp lead 320b. The second bead glass 350b protects the tube 310 from an impact caused by the tube 310 being expanded and contracted by the second lamp lead 320b.

FIG. 3 is a graph for comparing lamp efficiency according to a current flowing through a lamp and a lamp efficiency according to a current flowing through a lamp illustrated in FIG. 2.

Table 1 below is a table for comparing the lamp efficiency according to the current flowing through the lamp and the lamp efficiency according to the amount of current flowing through the lamp shown in FIG.

TABLE 1

Referring to FIGS. 2, 3 and Table 1, after the general lamp (Std lamp) is turned on through the voltage value and the luminance value according to the current flowing through the general lamp (Std lamp) of the general lamp (Std lamp) The efficiency can be seen. Here, the starting voltage for lighting the general lamp (Std lamp) is 1554.25V.

In addition, according to the first embodiment of the present invention, through the voltage value and the luminance value according to the current flowing through the lamp 300 in which the first and second emitter surface metal layers 340a and 340b including an oxide are formed. The efficiency of the lamp can be seen. Here, for example, the first and second emitter surface metal layers 340a and 340b include magnesium oxide (MgO). In addition, the starting voltage for turning on the lamp 300 including the magnesium oxide (MgO) is 1474.5V.

Therefore, it can be seen that the starting voltage for lighting the general lamp (Std lamp) is greater than the starting voltage for lighting the lamp 300.

In addition to the starting voltages, the following example shows that the voltage applied to the general lamp Std lamp is greater than the voltage applied to the lamp 300.

For example, when a current of 6 mA flows through the common lamp, the voltage across the common lamp is 1358.5 V, and the power consumed by the ordinary lamp is 8.2 W. . In addition, the luminance value of the general lamp (Std lamp) is 11798.8nit.

On the other hand, when a current of 6 mA flows through the lamp 300, the voltage across the lamp 300 is 1280.5V, and the power consumed by the lamp 300 is 7.7W. In addition, the luminance value of the lamp 300 is 11789 nit. Accordingly, the efficiency of the lamp 300 is 1443 (nit / W).

Specifically, when the power consumed by the general lamp (Std lamp) and the luminance value of the general lamp (Std lamp) are converted to 100%, respectively, the power consumed by the lamp 300 and the lamp 300 The luminance value of may be converted into 94% and 100%, respectively. In addition, when the efficiency of the general lamp (Std lamp) is converted to 100%, the efficiency of the lamp 300 may be converted to 106%.

Accordingly, it can be seen that the general lamp (Std lamp) consumes more power than the lamp 300 to emit light having a similar luminance value. That is, it can be seen that the efficiency of the lamp 300 is increased than the efficiency of the general lamp (Std lamp).

When 8 mA of current flows through the common lamp, the voltage applied to both ends of the common lamp is 1360.4V, and the power consumed by the ordinary lamp is 10.8W. In addition, the luminance value of the general lamp (Std lamp) is 17366.2nit.

On the other hand, when 8 mA of current flows through the lamp 300, the voltage across the lamp 300 is 1250.167 V, and the power consumed by the lamp 300 is 10.0 W. In addition, the luminance value of the lamp 300 is 17357.33nit.

Specifically, when the power consumed by the general lamp (Std lamp) and the luminance value of the general lamp (Std lamp) are converted to 100%, respectively, the power consumed by the lamp 300 and the lamp 300 The luminance value may be converted to 93% and 100%, respectively. In addition, when the efficiency of the general lamp (Std lamp) is converted to 100%, the efficiency of the lamp 300 may be converted to 108%.

Accordingly, it can be seen that the general lamp (Std lamp) consumes more power than the lamp 300 to emit light having a similar luminance value. That is, it can be seen that the efficiency of the lamp 300 is increased than the efficiency of the general lamp (Std lamp).

When a current of 10 mA flows through the common lamp, the voltage across the common lamp is 1317.8V, and the power consumed by the conventional lamp is 13.2W. In addition, the luminance value of the general lamp (Std lamp) is 22790.8 nit.

On the other hand, when a current of 10 mA flows in the lamp 300, the voltage across the lamp 300 is 1215.341V, and the power consumed by the lamp 300 is 12.2W. In addition, the luminance value of the lamp 300 is 22693.17nit.

Specifically, when the power consumed by the general lamp (Std lamp) and the luminance value of the general lamp (Std lamp) are converted to 100%, respectively, the power consumed by the lamp 300 and the lamp 300 The luminance value can be converted into 92% and 100%, respectively. In addition, when the efficiency of the general lamp (Std lamp) is converted to 100%, the efficiency of the lamp 300 may be converted to 108%.

Accordingly, it can be seen that the general lamp (Std lamp) consumes more power than the lamp 300 to emit light having a similar luminance value. That is, it can be seen that the efficiency of the lamp 300 is increased than the efficiency of the general lamp (Std lamp).

When a current of 12 mA flows in the general lamp (Std lamp), the voltage applied to both ends of the general lamp (Std lamp) is 1276.4V, and the power consumed by the general lamp (Std lamp) is 15.3W. In addition, the luminance value of the general lamp (Std lamp) is 27467.8nit.

On the other hand, when a current of 12 mA flows through the lamp 300, the voltage across the lamp 300 is 1174.5 V, and the power consumed by the lamp 300 is 14.1W. In addition, the luminance value of the lamp 300 is 27252.67 nit.

Specifically, when the power consumed by the general lamp (Std lamp) and the luminance value of the general lamp (Std lamp) are converted to 100%, respectively, the power consumed by the lamp 300 and the lamp 300 The luminance value can be converted into 92% and 100%, respectively. In addition, when the efficiency of the general lamp (Std lamp) is converted to 100%, the efficiency of the lamp 300 may be converted to 108%.

Accordingly, it can be seen that the general lamp (Std lamp) consumes more power than the lamp 300 to emit light having a similar luminance value. That is, it can be seen that the efficiency of the lamp 300 is increased than the efficiency of the general lamp (Std lamp).

Referring back to Figure 3, it can be seen that the difference between the efficiency of the lamp 300 and the efficiency of the general lamp (Std lamp) is about 7% to 9%.

FIG. 4 is a graph illustrating temperature measured at the first electrode, the center of the lamp, and the second electrode of the lamp illustrated in FIG. 2.

2 to 4, it can be seen that the temperature of the first electrode P11 and the second electrode P21 of the lamp 300 is higher than the temperature of the center M of the lamp.

As described in the graph illustrated in FIG. 3, since the general lamp (Std lamp) consumes more power than the lamp (300) to emit light having a similar luminance value, the power of the general lamp (Std lamp) may be reduced. It can be seen that the temperature of the first electrode and the second electrode is 40 degrees Celsius or more higher than the temperature of the first electrode P11 and the second electrode P21 of the lamp 300, respectively.

Therefore, it is possible to increase the reliability and the like of the lamp by reducing the generation of heat that degrades the lamp performance.

FIG. 5 is a cross-sectional view of an electron beam evaporator usable for manufacturing the lamp shown in FIG. 2.

2 and 5, the electron beam evaporator 10 includes a vacuum chamber 11.

The vacuum chamber 11 is brought into a vacuum state by the vacuum pump 16. The vacuum chamber 11 is composed of a metal to be coated (ME), a pedestal 12 for fixing the metal (ME), and a target material (TA) disposed facing the metal (ME). . Here, the interval between the metal to be ME and the target material TA is fluid according to the area of the metal to be ME, the size and deposition rate of the vacuum chamber 11, and in advance according to the above matters. Set it.

The tungsten filament TF and the permanent magnet 13 are disposed to surround the target material TA. The tungsten filament TF is heated to emit electrons, and the emitted electrons are deflected in the magnetic field generated by the permanent magnet 13, and the deflected electrons EB are irradiated with the target material TA to The target material (TA) is heated to melt and evaporate.

Here, the target material (TA) is vaporized and does not contain water. Accordingly, since the vaporized target material TA is used, poor light flicker of the lamp generated by reacting with the target material TA of water molecules and metal oxides can be improved.

The target material TA vaporized in this way is coated on the metal to be metal ME.

In Example 1 of the present invention, the target material (TA) is a metal oxide beryllium oxide (BeO), magnesium oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), barium oxide (BaO), cesium oxide ( CsO), and may include one or more selected from radium oxide (RaO). In addition, the target material (TA) may include cesium (Cs).

Table 2 below is a table comparing the starting time of the lamp including the cesium (Cs) shown in FIG. 2 with improved dark starting characteristics compared to the starting time of the lamp containing no cesium (Cs).

TABLE 2

2 and Table 2, the lamp 300 containing cesium (Cs) was turned on after about 10ms to 25ms after starting the lighting. On the other hand, a cesium (Cs-less lamp) that does not contain cesium (Cs) was turned on after about 800ms to 3000ms after starting to turn on.

 That is, since cesium Cs is included in the first electrode P11 and the second electrode P21 of the lamp 300, it can be seen that the black-start characteristic is improved.

6A and 6B are flowcharts for describing a method of manufacturing the lamp of FIG. 2. 6C is a perspective view illustrating a method of manufacturing the lamp of FIG. 2.

2, 6A to 6C, the fluorescent material 360 is applied to an appropriate thickness on the tube 310 of the lamp 300, and heated and dried (step S110). Subsequently, the first and second electrode bodies 330a and 330b included in the first and second electrodes P11 and P21 are formed (step S120). The first and second electrode bodies 330a and 330b may be nickel (Ni), molybdenum (Mo), niobium (Nb), tungsten (W), titanium (Ti), or tantalum (metal) having good conductivity. One or more substrates O selected from Ta) and iron (Fe) may be manufactured by pressing into a cup shape.

After forming the cup-shaped first and second electrode bodies 330a and 330b, the first and second emitter surface metal layers included in the first and second electrodes P11 and P21 ( 340a and 340b are formed (step S130). Step S130 includes forming the first and second emitter metal layers 341a and 341b (step S131) and forming the first and second surface metal layers 343a and 343b (step S133). Include.

In step S131, the first and second emitter metal layers 341a and 341b are coated by the electron beam evaporator 10 shown in FIG. 5. The target material TA vaporized by the electron beam evaporator 10 is coated on the first and second electrode bodies 330a and 330b. Here, the target material (TA) is vaporized and does not contain water. In addition, the target material (TA) is beryllium oxide (BeO), magnesium oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), barium oxide (BaO), cesium oxide (CsO), radium oxide (RaO) It may be one or more selected from.

In step S132, the first and second surface metal layers 343a and 343b are coated by the electron beam evaporator 10. The target material TA vaporized by the electron beam evaporator 10 is coated on the first and second emitter metal layers 341a and 341b. Here, since the target material (TA) is vaporized, it does not contain water. In addition, the target material (TA) may be cesium (Cs).

The formed first and second electrode bodies 330a and 330b and the first and second emitter surface metal layers 340a and 340b are disposed in the tube 310 (S140). When the mixed gas 380 of mercury, argon and neon is injected, the tube 310 is sealed.

Accordingly, the first and second emitter metal layers 341a and 341b, which are oxide metal materials having high electron emission efficiency, and the first and second surface metal layers 343a and 343b, which are metal materials having improved dark starting characteristics. ) May be stacked together on the first and second electrode bodies 330a and 330b, thereby preventing a poor light shaking of the lamp generated by the water molecules.

Example 2

7 is an exploded perspective view schematically illustrating a liquid crystal display according to a second exemplary embodiment of the present invention. Here, since the liquid crystal display shown in FIG. 7 is substantially the same as the liquid crystal display shown in FIG. 1 except for the lamp 400, corresponding elements are denoted by corresponding reference numerals, and description thereof will not be repeated. .

FIG. 8 is a cross-sectional view illustrating a lamp included in the LCD shown in FIG. 7.

The lamp shown in FIG. 8 is substantially the same as the cross-sectional view of the lamp shown in FIG. 2 except for the first emitter surface metal layer 440a and the second emitter surface metal layer 440b, so that corresponding elements are referred to for corresponding elements. Use numbers and omit duplicate descriptions.

7 and 8, the liquid crystal display according to the second exemplary embodiment of the present invention includes a liquid crystal display panel 100, a panel driver 200, a backlight assembly BL, a mold frame 660, and a top chassis 700. ) And bottom chassis 800. The backlight assembly BL includes a lamp 400.

The lamp 400 includes a tube 310, a first electrode P12, and a second electrode P22.

A predetermined amount of a mixed gas 380 of mercury, argon and neon is formed in the light emitting space 370 of the tube 310. A fluorescent material 360 is coated on the outer wall of the tube 310, and a small amount of alumina may be added to the fluorescent material 360 to improve initial startup. First and second electrodes P12 and P22 are formed at both ends of the tube 310.

When a voltage is applied to the first and second electrodes P12 and P22 of the lamp 400, electron emission by an electric field occurs from the first and second electrodes P12 and P22. Here, heat is not necessary because electron emission is made by an electric field rather than by heat. Electrons are emitted to excite mercury, and when the mercury is excited, ultraviolet rays are emitted, and the ultraviolet rays are converted into visible light.

Specifically, when a voltage is applied to the first and second electrodes P12 and P22 of the lamp 400, electrons in the tube 310 flow at high speed to the first and second electrodes P12 and P22. ) Is discharged by the secondary electrons generated by the collision of the accelerated electrons or cations on the surface of the first and second electrodes (P12, P22). Electrons emitted from the first and second electrodes P12 and P22 collide with mercury atoms, and ultraviolet rays are emitted due to the collision, and the ultraviolet rays convert the phosphor into visible light.

The first electrode P12 includes a first lamp lead 320a, a first electrode body 330a, a first emitter surface metal layer 440a, and a first bead glass 350a.

The first lamp lead 320a is connected to the lamp socket 610 to receive a voltage from the inverter 900.

The first electrode body 330a uses a metal material having good conductivity. The first electrode body 330a includes at least one selected from nickel (Ni), molybdenum (Mo), niobium (Nb), tungsten (W), titanium (Ti), tantalum (Ta), and iron (Fe). can do.

The first emitter surface metal layer 440a includes a first surface metal layer 441a and a first emitter metal layer 443a.

The first surface metal layer 441a uses a metal material that can improve the black-start characteristic of the lamp 300. The first surface metal layer 441a may include cesium (Cs). Specifically, cesium (Cs) is an electron-radioactive material having a high secondary electron emission coefficient, and thus, dark starting characteristics can be improved because discharge tends to occur according to secondary electrons emitted from cesium (Cs).

The one emitter metal layer 443a uses a metal material of an oxide having good electron emission efficiency. Here, the oxide may be an alkali metal oxide or an alkaline earth metal oxide. The one emitter metal layer 443a includes beryllium oxide (BeO), magnesium oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), barium oxide (BaO), cesium oxide (CsO), and radium oxide (RaO). It may include one or more selected from. Specifically, the first emitter metal layer 443a is made of an electron radioactive material having a high secondary electron emission coefficient. Therefore, when a voltage is applied to the first electrode P12, secondary electrons are emitted from the first electrode P12 to actively discharge in the light emitting space. As a result, the discharge start voltage is lowered and the light emission efficiency is also increased. Is raised. In addition, the heat generated during driving is reduced to increase the stability of the lamp 300.

The second electrode P22 includes a second lamp lead 320b, a second electrode body 330b, a second emitter surface metal layer 440b, and a second bead glass 350b.

The second lamp lead 320b is connected to the lamp socket 610 and grounded. The second lamp lead 320b may be connected to the inverter 900 to receive a voltage from the inverter 900.

The second electrode body 330b uses a metal material having good conductivity. The second electrode body 330b includes at least one selected from nickel (Ni), molybdenum (Mo), niobium (Nb), tungsten (W), titanium (Ti), tantalum (Ta), and iron (Fe). can do.

The second emitter surface metal layer 440b includes a second surface metal layer 441b and a second emitter metal layer 443b.

The second surface metal layer 441b uses a metal material that can improve the black-start characteristic of the lamp 300. The second surface metal layer 441b may include cesium (Cs). Specifically, cesium (Cs) is an electron-radioactive material having a high secondary electron emission coefficient, and thus, dark starting characteristics can be improved because discharge tends to occur according to secondary electrons emitted from cesium (Cs).

The second emitter metal layer 443b uses an oxide metal material having good electron emission efficiency. The second emitter metal layer 443b includes beryllium oxide (BeO), magnesium oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), barium oxide (BaO), cesium oxide (CsO), and radium oxide (RaO). It may include one or more selected from). Specifically, the second emitter metal layer 443b is usually made of an electron radioactive material having a high secondary electron emission coefficient. Therefore, when a voltage is applied to the second electrode P22, secondary electrons are emitted from the second electrode P22 to actively discharge in the light emitting space. As a result, the discharge start voltage is lowered and the light emission efficiency is also increased. Is raised. In addition, the heat generated during driving is reduced to increase the stability of the lamp 300.

Since the lamp efficiency according to the amount of current flowing through the lamp shown in FIG. 8 is substantially the same as the lamp efficiency according to the amount of current flowing through the lamp shown in FIG.

The temperature measured at the first electrode of the lamp, the center of the lamp, and the second electrode of the lamp shown in FIG. 8 is the first electrode of the lamp shown in FIG. 2, the center of the lamp, and the second of the lamp as described in FIG. 4. It is the same as the temperature measured at the electrode, so it is omitted.

The cross sectional view of the electron beam evaporator usable for manufacturing the lamp shown in FIG. 8 is substantially the same as the cross sectional view of the electron beam evaporator shown in FIG.

9A and 9B are flowcharts for describing a method of manufacturing the lamp of FIG. 8. 9C is a perspective view illustrating a method of manufacturing the lamp of FIG. 8.

The method of manufacturing the lamp shown in FIG. 8 is except that the first and second emitter metal layers 443a and 443b are formed after the first and second surface metal layers 441a and 441b are formed. Substantially the same as the manufacturing method of the lamp of FIG. 2 shown in FIG. 6C, corresponding elements are referred to by the corresponding reference numerals, and redundant descriptions are omitted.

8 and 9A to 9C, the fluorescent material 360 is applied to an appropriate thickness on the tube 310 of the lamp 400, and heated and dried (step S110). Subsequently, the first and second electrode bodies 330a and 330b included in the first and second electrodes P12 and P22 are formed (step S120). The first and second electrode bodies 330a and 330b may be nickel (Ni), molybdenum (Mo), niobium (Nb), tungsten (W), titanium (Ti), or tantalum (metal) having good conductivity. One or more substrates O selected from Ta) and iron (Fe) may be manufactured by pressing into a cup shape.

After forming the cup-shaped first and second electrode bodies 330a and 330b, the first and second emitter surface metal layers included in the first and second electrodes P12 and P22 ( 440a and 440b) are formed (step S230). Step S230 is performed to form the first and second surface metal layers 441a and 441b (step S231) and to form the first and second emitter metal layers 443a and 443b (step S233). It includes more.

In step S231, the first and second surface metal layers 441a and 441b are coated by the electron beam evaporator 10 shown in FIG. The target material TA vaporized by the electron beam evaporator 10 is coated on the first and second electrode bodies 330a and 330b. Here, the target material (TA) is vaporized and does not contain water. In addition, the target material (TA) may be cesium (Cs).

In step S232, the first and second emitter metal layers 443a and 443b are coated by the electron beam evaporator 10. The target material TA vaporized by the electron beam evaporator 10 is coated on the first and second emitter metal layers 443a and 443b. Here, the target material (TA) is vaporized and does not contain water. In addition, the target material (TA) is beryllium oxide (BeO), magnesium oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), barium oxide (BaO), cesium oxide (CsO), radium oxide (RaO) It may be one or more selected from.

The formed first and second electrode bodies 330a and 330b and the first and second emitter surface metal layers 440a and 440b are disposed in the tube 310. When the mixed gas 380 of mercury, argon and neon is injected, the tube 310 is sealed.

Accordingly, the first and second surface metal layers 441a and 441b, which are metal materials having improved dark starting characteristics, and the first and second emitter metal layers 443a and 443b, which are metal materials of oxides having high electron emission efficiency. ) May be stacked together on the first and second electrode bodies 330a and 330b, thereby preventing a poor light shaking of the lamp generated by the water molecules.

Example 3

10 is an exploded perspective view schematically showing a liquid crystal display according to a third embodiment of the present invention. Here, since the liquid crystal display shown in FIG. 10 is substantially the same as the liquid crystal display shown in FIG. 1 except for the lamp 500, corresponding elements are denoted by corresponding reference numerals, and redundant descriptions thereof will be omitted. .

FIG. 11 is a cross-sectional view illustrating a lamp included in the liquid crystal display shown in FIG. 10.

The lamp shown in FIG. 11 is substantially the same as the cross-sectional view of the lamp shown in FIG. 2 except for the first emitter surface metal layer 540a and the second emitter surface metal layer 540b, so that corresponding elements are referred to for corresponding elements. Use numbers and omit duplicate descriptions.

10 and 11, the liquid crystal display according to the second exemplary embodiment of the present invention includes a liquid crystal display panel 100, a panel driver 200, a backlight assembly BL, a mold frame 660, and a top chassis 700. ) And bottom chassis 800. The backlight assembly BL includes a lamp 500.

The lamp 500 includes a tube 310, a first electrode P13, and a second electrode P23.

A predetermined amount of a mixed gas 380 of mercury, argon and neon is formed in the light emitting space 37 of the tube 310. A fluorescent material 360 is coated on the outer wall of the tube 310, and a small amount of alumina may be added to the fluorescent material 360 to improve initial startup. First and second electrodes P13 and P23 are formed at both ends of the tube 310.

When voltage is applied to the first and second electrodes P13 and P23 of the lamp 500, electron emission from the first and second electrodes P13 and P23 is caused by an electric field. Here, heat is not necessary because electron emission is made by an electric field rather than by heat. Electrons are emitted to excite mercury, and when the mercury is excited, ultraviolet rays are emitted, and the ultraviolet rays are converted into visible light.

Specifically, when a voltage is applied to the first and second electrodes P13 and P23 of the lamp 500, electrons in the tube 310 flow at high speed to the first and second electrodes P13 and P23. ) Is discharged by the secondary electrons generated by the collision of the accelerated electrons or cations on the surface of the first and second electrodes (P13, P23). Electrons emitted from the first and second electrodes P13 and P23 collide with mercury atoms, and ultraviolet rays are emitted due to the collision, and the ultraviolet rays convert the phosphor into visible light.

The first electrode P13 includes a first lamp lead 320a, a first electrode body 330a, a first emitter surface metal layer 540a, and a first bead glass 350a.

The first lamp lead 320a is connected to the lamp socket 610 to receive a voltage from the inverter 900.

The first electrode body 330a uses a metal material having good conductivity. The first electrode body 330a includes at least one selected from nickel (Ni), molybdenum (Mo), niobium (Nb), tungsten (W), titanium (Ti), tantalum (Ta), and iron (Fe). can do.

The first emitter surface metal layer 540a includes beryllium oxide (BeO), magnesium oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), and barium oxide (BaO), which are metal materials of an oxide having good electron emission efficiency. And cesium oxide (CsO), and may include cesium (Cs), which is a metal material including one or more selected from radium oxide (RaO) and may improve black-start characteristics. Here, the oxide may be an alkali metal oxide or an alkaline earth metal oxide.

Specifically, cesium (Cs) is an electron-radioactive material having a high secondary electron emission coefficient, and thus, dark starting characteristics can be improved because discharge tends to occur according to secondary electrons emitted from cesium (Cs).

In addition, when the voltage is applied to the first electrode P13, the metal material of the oxide having a high secondary electron emission coefficient emits secondary electrons from the first electrode P13 to actively discharge in the light emitting space. As a result, the discharge start voltage is lowered and the luminous efficiency is also increased. In addition, the heat generated during driving is reduced to increase the stability of the lamp 500.

The second electrode P23 includes a second lamp lead 320b, a second electrode body 330b, a second emitter surface metal layer 540b, and a second bead glass 350b.

The second lamp lead 320b is connected to the lamp socket 610 and grounded. The second lamp lead 320b may be connected to the inverter 900 to receive a voltage from the inverter 900.

The second electrode body 330b uses a metal material having good conductivity. The second electrode body 330b includes at least one selected from nickel (Ni), molybdenum (Mo), niobium (Nb), tungsten (W), titanium (Ti), tantalum (Ta), and iron (Fe). can do.

The second emitter surface metal layer 440b includes beryllium oxide (BeO), magnesium oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), and barium oxide (BaO), which are metal materials of an oxide having good electron emission efficiency. And cesium oxide (CsO), and may include cesium (Cs), which is a metal material including one or more selected from radium oxide (RaO) and may improve black-start characteristics.

Specifically, cesium (Cs) is an electron-radioactive material having a high secondary electron emission coefficient, and thus, dark starting characteristics can be improved because discharge tends to occur according to secondary electrons emitted from cesium (Cs).

In addition, when the voltage is applied to the first electrode P13, the metal material of the oxide having a high secondary electron emission coefficient emits secondary electrons from the first electrode P13 to actively discharge in the light emitting space. As a result, the discharge start voltage is lowered and the luminous efficiency is also increased. In addition, the heat generated during driving is reduced to increase the stability of the lamp 500.

The lamp efficiency according to the amount of current flowing through the lamp shown in FIG. 11 is substantially the same as the lamp efficiency according to the amount of current flowing through the lamp shown in FIG.

The temperature measured at the first electrode of the lamp, the center of the lamp, and the second electrode of the lamp shown in FIG. 11 is the first electrode of the lamp, the center of the lamp, and the second of the lamp as shown in FIG. It is the same as the temperature measured at the electrode, so it is omitted.

The cross sectional view of the electron beam evaporator usable for manufacturing the lamp shown in FIG. 11 is substantially the same as the cross sectional view of the electron beam evaporator shown in FIG.

12A and 12B are flowcharts for describing a method of manufacturing the lamp of FIG. 11. 12C is a perspective view illustrating a method of manufacturing the lamp of FIG. 11.

The manufacturing method of the lamp shown in FIG. 11 is the manufacturing of the lamp of FIG. 2 shown in FIGS. 6A-6C except that the first and second emitter surface metal layers 540a and 540b are formed in one layer. Since it is substantially the same as the method, the corresponding reference numerals are used for corresponding elements, and duplicate descriptions are omitted.

11, 12A and 12B, the fluorescent material 360 is applied to the tube 310 of the lamp 500 to an appropriate thickness, and dried by heating (step S110). Subsequently, the first and second electrode bodies 330a and 330b included in the first and second electrodes P13 and P23 are formed (step S120). The first and second electrode bodies 330a and 330b may be nickel (Ni), molybdenum (Mo), niobium (Nb), tungsten (W), titanium (Ti), or tantalum (metal) having good conductivity. One or more substrates O selected from Ta) and iron (Fe) may be manufactured by pressing into a cup shape.

After the cup-shaped first and second electrode bodies 330a and 330b are formed, the first and second emitter surface metal layers included in the first and second electrodes P13 and P23 ( 440a and 440b) are formed (step S330).

In step S330 the first and second emitter surface metal layers 540a and 540b are coated by the electron beam evaporator 10 shown in FIG. 5. The target material TA vaporized by the electron beam evaporator 10 is coated on the first and second electrode bodies 330a and 330b. Here, the target material (TA) is vaporized and does not contain water. In addition, the target material (TA) is beryllium oxide (BeO), magnesium oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), barium oxide (BaO), cesium oxide (CsO), radium oxide (RaO) It includes one selected from, and includes cesium (Cs).

The formed first and second electrode bodies 330a and 330b and the first and second metric surface metal layers 540a and 540b are disposed in the tube 310. When the mixed gas 380 of mercury, argon and neon is injected, the tube 310 is sealed.

Accordingly, the first and second emitter surface metal layers 540a and 540b including the metal material having improved dark starting characteristics and the metal material of oxide having high electron emission efficiency are simultaneously formed. Since it can be stacked on the 330a and 330b, it is possible to prevent the poor light shaking of the lamp generated by the water molecules.

According to embodiments of the present invention, since the electrode of the lamp includes a metal having good electron emission efficiency, the temperature of the lamp electrode is reduced, and the efficiency of the lamp is increased. Therefore, the power consumption of the lamp can be reduced, and the dark starting characteristic of the lamp can be improved.

Although described above with reference to the embodiments, those skilled in the art can be variously modified and changed within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below. I can understand.

1 is an exploded perspective view schematically showing a liquid crystal display according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a lamp included in the liquid crystal display shown in FIG. 1.

FIG. 3 is a graph for comparing lamp efficiency according to a current flowing through a lamp and a lamp efficiency according to a current flowing through a lamp illustrated in FIG. 2.

FIG. 4 is a graph illustrating temperature measured at the first electrode, the center of the lamp, and the second electrode of the lamp illustrated in FIG. 2.

FIG. 5 is a cross-sectional view of an electron beam evaporator usable for manufacturing the lamp shown in FIG. 2.

6A and 6B are flowcharts for describing a method of manufacturing the lamp of FIG. 2.

6C is a perspective view illustrating a method of manufacturing the lamp of FIG. 2.

7 is an exploded perspective view schematically illustrating a liquid crystal display according to a second exemplary embodiment of the present invention.

FIG. 8 is a cross-sectional view illustrating a lamp included in the LCD shown in FIG. 7.

9A and 9B are flowcharts for describing a method of manufacturing the lamp of FIG. 8.

10 is an exploded perspective view schematically showing a liquid crystal display according to a third embodiment of the present invention.

FIG. 11 is a cross-sectional view illustrating a lamp included in the liquid crystal display shown in FIG. 10.

12A and 12B are flowcharts for describing a method of manufacturing the lamp of FIG. 11.

<Description of the symbols for the main parts of the drawings>

300: lamp P11: first electrode

P21: second electrode M: center of lamp

310: tube

320a and 320b: first and second lamp leads

330a and 330b: first and second electrode bodies

340a and 340b: first and second emitter surface metal layers

341a and 341b: first and second emitter metal layers

343a and 343b: first and second surface metal layers

350a and 350b: first and second bead glasses

360: fluorescent material 370: light emitting space

380 mixed gas

Claims (21)

A tube forming a light emitting space; An electrode body disposed inside the tube; And A lamp comprising an alkali metal oxide or an alkali metal oxide, and comprising an emitter surface metal layer covering the electrode body. The method of claim 1, wherein the emitter surface metal layer is beryllium oxide (BeO), magnesium oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), barium oxide (BaO), cesium oxide (CsO), radium oxide And at least one selected from (RaO) and comprising cesium (Cs). The lamp of claim 1, wherein the emitter surface metal layer comprises an emitter metal layer of a metal oxide material covering the electrode body and a surface metal layer of a metal material covering the emitter metal layer. The method of claim 3, wherein the emitter metal layer is beryllium oxide (BeO), magnesium oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), barium oxide (BaO), cesium oxide (CsO), radium oxide ( And at least one selected from RaO). The lamp of claim 4, wherein the surface metal layer comprises cesium (Cs). The lamp of claim 1, wherein the emitter surface metal layer comprises a surface metal layer of a metal material covering the electrode body and an emitter metal layer of a metal oxide material covering the surface metal layer. The method of claim 6, wherein the emitter metal layer is beryllium oxide (BeO), magnesium oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), barium oxide (BaO), cesium oxide (CsO), radium oxide ( And at least one selected from RaO). The lamp of claim 7, wherein the surface metal layer comprises cesium (Cs). The method of claim 1, wherein the electrode body is at least one selected from nickel (Ni), molybdenum (Mo), niobium (Nb), tungsten (W), titanium (Ti), tantalum (Ta), iron (Fe). Lamp comprising a. Applying a phosphor to a tube in which a light emitting space is formed; Processing the electrode metal plate to form an electrode body; Vaporizing a metal material including an alkali metal oxide or an alkali metal oxide to form an emitter surface metal layer on the electrode body; And And placing the electrode body on which the emitter surface metal layer is formed on the tube. The method of claim 10, wherein the metal material is vaporized and deposited in an electron beam evaporator. The method of claim 11, wherein the metal material comprises a metal oxide material including an oxide and cesium (Cs). The method of claim 12, wherein the metal oxide material is beryllium oxide (BeO), magnesium oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), barium oxide (BaO), cesium oxide (CsO), radium oxide ( And at least one selected from RaO). The method of claim 13, wherein in the forming of the emitter surface metal layer, the metal oxide material and the cesium (Cs) are simultaneously vaporized and deposited on the electrode body. The method of claim 13, wherein the forming of the emitter surface metal layer comprises: Vaporizing the metal oxide material to form an emitter metal layer on the electrode body; And Evaporating the cesium (Cs) to form a surface metal layer on the emitter metal layer. The method of claim 13, wherein the forming of the emitter surface metal layer is Vaporizing the cesium (Cs) to form a surface metal layer on the electrode body; And Vaporizing the metal oxide material to form an emitter metal layer on the surface metal layer. A liquid crystal display panel; A light emitting space comprising: a tube forming a light emitting space; an electrode body disposed inside the tube; and an emitter surface metal layer including an alkali metal oxide or an alkali earth metal oxide covering the electrode body, and providing light to the liquid crystal display panel. Lamps; And And an inverter for supplying power to the plurality of lamps. The method of claim 17, wherein the emitter surface metal layer is beryllium oxide (BeO), magnesium oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), barium oxide (BaO), cesium oxide (CsO), radium oxide And at least one oxide selected from RaO and cesium (Cs). The method of claim 18, wherein the emitter surface metal layer, An emitter metal layer comprising the oxide and covering the electrode body; And And a surface metal layer including the cesium (Cs) and covering the emitter metal layer. The method of claim 18, wherein the emitter surface metal layer, A surface metal layer including the cesium (Cs) and covering the electrode body; And And an emitter metal layer including the oxide and covering the emitter metal layer. The liquid crystal display device according to claim 18, wherein the emitter surface metal layer is a mixture of the oxide and cesium (Cs).

Images