KR20070018415A - Flat fluorescent lamp, backlight assembly and liquid crystal display apparatus having the same - Google Patents

Abstract

Disclosed are a flat panel fluorescent lamp capable of improving luminance and a liquid crystal display having the same. The flat fluorescent lamp includes a lower substrate, an upper substrate, and a reflective film. The upper substrate is combined with the lower substrate to form a plurality of discharge spaces. The reflective film is formed on the outer surface of the lower substrate. The reflecting film is made of at least one of silver or aluminum. The flat fluorescent lamp may further include a protective film coated on the reflective film. In addition, the flat fluorescent lamp may further include a fluorescent film formed on the inner surface of the lower substrate and the inner surface of the upper substrate. Therefore, the luminance of light emitted from the flat fluorescent lamp can be improved, and discoloration of light can be prevented.

Description

FLAT FLUORESCENT LAMP, BACKLIGHT ASSEMBLY AND LIQUID CRYSTAL DISPLAY APPARATUS HAVING THE SAME}

1 is a perspective view showing a flat fluorescent lamp according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line II ′ of FIG. 1.

3 is a cross-sectional view taken along the line II-II 'of FIG. 1.

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

FIG. 5 is a combined cross-sectional view of the backlight assembly shown in FIG. 4.

6 is a cross-sectional view illustrating a backlight assembly according to another exemplary embodiment of the present invention.

7 is a cross-sectional view illustrating a backlight assembly according to another embodiment of the present invention.

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

100: flat fluorescent lamp 110: lamp body

120: first fluorescent layer 130: lower substrate

140: upper substrate 160: reflective layer

170: second fluorescent film 180: electrode

200: liquid crystal display 210: top chassis

300: backlight assembly 310: storage container

320: flat fluorescent lamp 330: fluorescent layer

340: diffusion plate 350: optical sheet

360: Inverter 400: Display Unit

410: liquid crystal display panel 420: driving circuit

The present invention relates to a flat panel fluorescent lamp, a backlight assembly, and a liquid crystal display device having the same. More particularly, the present invention relates to a flat panel fluorescent lamp, a backlight assembly, and a liquid crystal display device having the same, which can improve the reliability of a product by removing a pinhole phenomenon. will be.

In general, a liquid crystal display (LCD) is a display device that displays an image using a liquid crystal having optical and electrical characteristics such as anisotropic refractive index and anisotropic dielectric constant. Such liquid crystal displays are thinner and lighter than other display devices such as CRTs and PDPs, and have low driving voltages and low power consumption, and thus are widely used throughout the industry.

Such a liquid crystal display device requires a backlight assembly for supplying light to the liquid crystal display panel because the liquid crystal display panel for displaying an image is a non-light emitting device that does not emit light by itself.

In the conventional backlight assembly, an elongated cylindrical Cold Cathode Fluorescent Lamp (CCFL) is mainly used as a light source. However, as the size of the liquid crystal display increases, the number of cold cathode fluorescent lamps required increases, resulting in an increase in manufacturing cost and inferior optical characteristics such as luminance uniformity.

In order to solve this problem, recently, a flat fluorescent lamp that directly emits light in the form of a plane has been developed. The flat fluorescent lamp has a structure divided into a plurality of discharge spaces for uniform light emission over a large area, and has a structure coated with a fluorescent material as a whole.

The flat fluorescent lamp generates plasma discharge in each discharge space in response to the discharge voltage applied from the inverter. At this time, the fluorescent material formed inside the flat fluorescent lamp is excited by the ultraviolet rays generated by the plasma discharge to generate visible light.

However, when a high voltage is applied to emit light of a flat fluorescent lamp, a region in which a strong electric field is applied is formed inside the flat fluorescent lamp, and in such a region, a pin hole is caused by deterioration of a fluorescent material under the influence of dielectric breakdown. ) Is a problem that occurs.

Accordingly, the present invention has been made in view of such a problem, and the present invention provides a flat fluorescent lamp that can prevent a pinhole phenomenon.

In addition, the present invention provides a backlight assembly that can prevent the pinhole phenomenon.

In addition, the present invention provides a liquid crystal display device having the above-described backlight assembly.

The flat fluorescent lamp according to an aspect of the present invention described above includes a lamp body and a first fluorescent layer. The lamp body forms discharge spaces therein by combining the lower substrate and the upper substrate, and generates invisible light in response to a driving power input from the outside. The first fluorescent layer is formed on an outer surface of the upper substrate, and generates visible light in response to the invisible light.

According to an aspect of the present invention, there is provided a backlight assembly including an accommodating container, a flat plate fluorescent lamp accommodated in the storage container, a fluorescent layer formed on the outside of the flat plate fluorescent lamp, a diffusion plate disposed on the flat plate fluorescent lamp, and the diffusion plate. At least one optical sheet disposed thereon. The flat plate fluorescent lamp has discharge spaces formed therein by a combination of a lower substrate and an upper substrate, and generates invisible light in response to a driving power input from the outside. The fluorescent layer generates visible light in response to the invisible light.

A liquid crystal display according to an aspect of the present invention includes a backlight assembly for supplying light and a display unit for displaying an image using light from the backlight assembly. The backlight assembly may include a storage container, a flat plate fluorescent lamp accommodated in the storage container, a fluorescent layer formed on the outside of the flat plate fluorescent lamp, a diffuser plate disposed above the flat plate fluorescent lamp, and at least one disposed above the diffuser plate. It includes an optical sheet of. The flat plate fluorescent lamp has discharge spaces formed therein by a combination of a lower substrate and an upper substrate, and generates invisible light in response to a driving power input from the outside. The fluorescent layer generates visible light in response to the invisible light. The display unit includes a liquid crystal display panel for displaying an image and a driving circuit unit for driving the liquid crystal display panel.

According to the flat panel fluorescent lamp, the backlight assembly and the liquid crystal display device having the same, by forming a fluorescent layer that generates visible light in response to invisible light outside the flat fluorescent lamp, it is possible to eliminate the pinhole phenomenon and improve the reliability of the product. .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view illustrating a planar fluorescent lamp according to an exemplary embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line II ′ of FIG. 1, and FIG. 3 is a line II-II ′ of FIG. 1. It is a cut section.

1, 2 and 3, the flat fluorescent lamp 100 according to an embodiment of the present invention is a lamp body 110 and the first fluorescent layer 120 formed on the outer surface of the lamp body 110 Include.

The lamp body 110 forms discharge spaces 112 therein by combining the lower substrate 130 and the upper substrate 140. The lamp body 110 generates invisible light in response to the driving power input from the outside. For example, the lamp body 110 generates light in the ultraviolet wavelength band.

The first fluorescent layer 120 is formed on the upper surface of the lamp body 110, that is, on the outer surface of the upper substrate 140. The first fluorescent layer 120 generates visible light in response to the invisible light generated by the lamp body 110.

In order to emit light in a plane form, the lamp body 110 has a quadrangular shape as viewed from above. Since the lamp body 110 has a large light emitting area, the internal space is divided into a plurality of discharge spaces 112 in order to improve the light emitting efficiency. The lamp body 110 generates plasma discharge in the discharge spaces 112 in response to a driving power source applied from an external inverter (not shown), and emits invisible light generated by the plasma discharge, for example, light in an ultraviolet wavelength band. Exit to the outside.

The lamp body 110 includes a lower substrate 130 and an upper substrate 140 formed to be combined with the lower substrate 130 to form discharge spaces 112.

The lower substrate 130 has a rectangular plate shape. The lower substrate 130 is made of, for example, a glass material.

The upper substrate 140 is a substrate processed to form the discharge spaces 112. The upper substrate 140 is made of a transparent material so that the invisible light generated in the discharge spaces 112 can be transmitted. For example, the upper substrate 140 is made of glass.

Molding of the upper substrate 140 may be performed by various methods. For example, the upper substrate 140 is manufactured by heating a glass substrate having the same plate shape as the lower substrate 130 to a predetermined temperature and then molding it through a mold having a desired shape. In addition, the upper substrate 140 may be processed by a method such as heating the plate-shaped glass substrate and processing the shape by suction of air.

The molded upper substrate 140 includes discharge space parts 142, space dividers 144, and a sealing part 146 to form a plurality of discharge spaces 112. The discharge space parts 142 are spaced apart from the lower substrate 130 to form the discharge spaces 112. The space dividers 144 divide the discharge spaces 112 in contact with the lower substrate 130 between the discharge space parts 142. The sealing part 146 is coupled to the lower substrate 130 at the edge of the upper substrate 140.

As shown in FIG. 2, the longitudinal cross-section of the upper substrate 140 has a shape in which the arcuate discharge spaces 142 are continuously spaced apart at regular intervals. However, the upper substrate 140 may be formed such that the longitudinal cross-sections of the discharge spaces 142 may have various shapes such as semicircles, quadrangles, and trapezoids.

Meanwhile, the first fluorescent layer 120 formed on the outer surface of the upper substrate 140 may be formed at different densities according to positions of the lamp body 110. That is, the first fluorescent layer 120 may be formed in a greater amount at positions corresponding to the discharge space portions 142 that generate the invisible light than the space divisions 144 that do not substantially generate the invisible light. . As such, since the amount of the first fluorescent layer 120 is differently formed according to the position of the upper substrate 140, the luminance of visible light generated may be improved.

Connection paths 148 for connecting the discharge spaces 112 adjacent to each other are formed in the upper substrate 140. At least one connection passage 148 is formed in each space division part 144. The connection passage 148 may provide a passage through which air or discharge gas may move when exhausting air existing in the discharge spaces 112 or injecting discharge gas into the discharge spaces 112.

The connection passage 148 is formed at the same time during the molding process of the upper substrate 140. The connection passage 148 may have various shapes as long as it can connect the adjacent discharge spaces 112 to each other. For example, the connection passage 148 has a structure bent in an S shape. As such, when the connecting passage 148 has a structure bent in an S shape, a movement path through which the discharge gas may move is long, and thus, a drift phenomenon due to mutual interference between adjacent discharge spaces 112 may be effectively prevented.

The lower substrate 130 and the upper substrate 140 are coupled to each other through the adhesive member 150. For example, the adhesive member 150 is made of frit, which is a mixture of glass and metal having a lower melting point than glass.

The adhesive member 150 is disposed at a position corresponding to the sealing part 146 between the lower substrate 130 and the upper substrate 140 to couple the lower substrate 130 and the upper substrate 140. The adhesive member 150 disposed between the lower substrate 130 and the upper substrate 140 is melted by heat applied from the outside to bond the lower substrate 130 and the upper substrate 140.

The space dividers 144 of the upper substrate 140 are in close contact with the lower substrate 130 by a pressure difference between the inside and the outside of the lamp body 110. Specifically, after the combination of the lower substrate 130 and the upper substrate 140 to exhaust the air present in the discharge spaces 112 to create a vacuum state, thereafter, the discharge spaces 112 for various plasma discharge A kind of discharge gas is injected. For example, the discharge gas includes mercury (Hg), neon (Ne), argon (Ar), and the like. The gas pressure of the discharge gas existing in the discharge spaces 112 is about 50 torr to about 70 torr, and a pressure difference is generated in comparison with the external atmospheric pressure of 760 torr. Due to this pressure difference, a force directed from the outside to the inside of the lamp body 110 is generated, and the space dividing portions 144 are in close contact with the lower substrate 130 by this force.

Meanwhile, the planar fluorescent lamp 100 further includes a reflective layer 160 formed on an outer surface of the lower substrate 130. The reflective layer 160 reflects visible and invisible light emitted downward through the lower substrate 130.

The reflective layer 160 is made of a material having high reflectance in order to increase reflection efficiency with respect to light. For example, the reflective layer 160 is formed by applying a silver (Ag) component. The reflective layer 160 of the silver (Ag) component may be formed by a wet plating method using silver nitrate (AgNO).

Alternatively, the reflective layer 160 may be formed of aluminum (Al). The reflective layer 160 of the aluminum (Al) component may be formed by an aluminum mirror manufacturing method of attaching the aluminum particles to the surface of the lower substrate 130 at high pressure in a vacuum state. The reflective layer 160 may be formed by a sputtering method using silver (Ag), aluminum (Al), or various other metals.

In addition, the reflective layer 160 may be formed of a metal oxide such as aluminum oxide (Al ₂ O ₃ ) or barium sulfate (BaSO ₄ ) to increase the reflectance and reduce the change in color coordinate.

As such, when the reflective layer 160 is formed on the outer surface of the lower substrate 130, the luminance of light emitted in the upper direction may be improved by preventing leakage of light in the lower direction, and the mercury present in the discharge space 112 may be improved. Discoloration can be prevented by preventing the reaction with (Hg). Although not shown, the reflective layer 160 may be formed on the inner surface of the lower substrate 130.

The planar fluorescent lamp 100 may further include a second fluorescent layer 170 formed on an outer surface of the lower substrate 130. When the reflective layer 160 is formed on the outer surface of the lower substrate 130, the second fluorescent layer 170 is disposed between the lower substrate 130 and the reflective layer 160.

Like the first fluorescent layer 170, the second fluorescent layer 170 generates visible light in response to invisible light generated from the lamp body 110.

As such, the first fluorescent layer 120 is formed on the upper surface of the lamp body 110, and the second fluorescent layer 170 is formed on the lower surface of the lamp body 110, whereby the luminous efficiency of the flat fluorescent lamp 100 is reduced. Can be further improved.

Although not shown, a protective layer may be further formed on the upper and lower surfaces of the flat fluorescent lamp 100 to protect the first fluorescent layer 120 and the reflective layer 160. For example, the protective layer is formed by application of a polymer having excellent adhesion. The protective layer prevents scratches from occurring in the first fluorescent layer 120 and the reflective layer 160 due to external impact or scratching.

The flat panel fluorescent lamp 100 further includes an electrode 180 for receiving driving power. The electrode 180 is formed to intersect all the discharge spaces 112 at both ends of the lamp body 110.

The electrode 180 is formed on the outer surface of the upper substrate 140. In addition, the electrode 180 may be formed on the outer surface of the lower substrate 130. The electrodes 180 formed on the upper substrate 140 and the lower substrate 130 may be electrically connected to each other through a connecting means such as a conductive clip (not shown). Alternatively, the electrode 180 may be formed on the inner surface of the lower substrate 130 or the upper substrate 140.

On the other hand, in the present embodiment, the upper substrate constituting the lamp body has a structure in which the molding process, in contrast, the lamp body has a discharge shape between the lower substrate and the upper substrate while the upper substrate has the same plate shape as the lower substrate It may have a structure in which a plurality of partitions are formed for dividing them.

4 is an exploded perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 5 is a combined cross-sectional view of the backlight assembly illustrated in FIG. 4.

4 and 5, the liquid crystal display 200 according to the exemplary embodiment includes a backlight assembly 300 for supplying light and a display unit 400 for displaying an image.

The backlight assembly 300 includes a storage container 310, a flat plate fluorescent lamp 320, a fluorescent layer 330, a diffusion plate 340, and an optical sheet 350.

The storage container 310 includes a side portion 314 extending from an edge of the bottom portion 312 and the bottom portion 312 to form a storage space in order to accommodate the flat fluorescent lamp 320. The storage container 310 is made of, for example, a metal having high strength and low deformation.

The planar fluorescent lamp 320 forms discharge spaces 326 therein by combining the lower substrate 322 and the upper substrate 324, and invisible light in response to a driving power applied from an external inverter 360. For example, light is generated in the ultraviolet wavelength band.

In the present exemplary embodiment, since the flat fluorescent lamp 320 has the same structure as that shown in FIGS. 1 to 3, detailed description thereof will be omitted.

The fluorescent layer 330 is formed outside the planar fluorescent lamp 320 and generates visible light in response to invisible light emitted from the planar fluorescent lamp 320.

In the present embodiment, the fluorescent layer 330 is formed on the outer surface of the upper substrate 324 of the flat fluorescent lamp 320. Alternatively, the fluorescent layer 330 may be formed on the outer surface of the upper substrate 324 and the lower surface of the lower substrate 322 of the flat fluorescent lamp 320.

In addition, the fluorescent layer 330 may be formed not only on the outer surface of the flat fluorescent lamp 320 but also on the inner surface of the storage container 310. As such, since the fluorescent layer 330 is formed on the inner surface of the storage container 310 as well as the outer surface of the flat fluorescent lamp 320, the generation efficiency for visible light is further improved.

The diffusion plate 340 is disposed above the flat plate fluorescent lamp 320 and diffuses visible light generated through the fluorescent layer 330 to improve luminance uniformity. The diffusion plate 340 is formed in a plate shape having a predetermined thickness and is spaced apart from the flat plate fluorescent lamp 320 at a predetermined interval. The diffusion plate 340 is made of a transparent material for transmitting light, and includes a diffusion agent for diffusing light. The diffusion plate 340 is made of, for example, polymethyl methacrylate (PMMA).

The optical sheet 350 is disposed on the diffuser plate 340 and changes the path of the light diffused through the diffuser plate 340 to improve the luminance characteristic. The optical sheet 350 may include a prism sheet for concentrating the light diffused through the diffusion plate 340 in the front direction to improve the front brightness of the light.

In addition, the optical sheet 350 may include a diffusion sheet for diffusing the light diffused through the diffusion plate 340 to improve luminance uniformity.

In addition, the optical sheet 350 may include a reflective polarizing sheet for increasing the brightness of the light in a manner that transmits light that satisfies a specific condition and reflects the remaining light. Meanwhile, the optical sheet having various functions may be added to or removed from the backlight assembly 300 according to required brightness characteristics.

On the other hand, the backlight assembly 300 further includes an inverter 360 for generating a driving power for light emitting the flat fluorescent lamp 320. The inverter 360 is disposed outside the storage container 310. The inverter 360 outputs driving power by boosting the low-voltage alternating voltage applied from the outside to a high-potential alternating voltage suitable for light emission of the flat panel fluorescent lamp 320. The driving power generated from the inverter 360 is applied to the flat panel fluorescent lamp 320 through the first power line 362 and the second power line 364.

In addition, the backlight assembly 300 may further include an insulation member 370 disposed between the storage container 310 and the flat plate fluorescent lamp 320 to support the flat plate fluorescent lamp 320. The insulating member 370 is disposed to correspond to the edge of the flat fluorescent lamp 320, and the flat fluorescent lamp 320 is spaced apart from the storage container 310 by a predetermined distance to the flat fluorescent lamp 320 and the metal storage container. Block electrical contact between (310).

The insulating member 370 is made of a material having a certain degree of elasticity in order to absorb an impact applied from the outside. The insulating member 370 is made of, for example, silicon material to insulate and buffer the flat fluorescent lamp 320.

The insulating member 370 is composed of two pieces having a "c" shape. In contrast, the insulating member 370 may be formed of four pieces corresponding to each side of the flat fluorescent lamp 320, or may be formed of four pieces corresponding to four corners of the flat fluorescent lamp 320, or may have a frame shape. It can be formed integrally with.

The backlight assembly 300 may further include a first mold 380 disposed between the planar fluorescent lamp 320 and the diffusion plate 340. The first mold 380 supports the edge of the diffusion plate 340 while fixing the edge of the flat fluorescent lamp 320.

As shown, the first mold 380 is integrally formed in a frame shape. Alternatively, the first mold 380 may be composed of two pieces having a "c" or "a" shape, or may have a structure divided into four pieces corresponding to each side.

The backlight assembly 300 may further include a second mold 390 disposed between the optical sheet 350 and the liquid crystal display panel 410. The second mold 390 supports the edge of the liquid crystal display panel 410 while fixing the edges of the diffusion plate 340 and the optical sheet 350.

Like the first mold 380, the second mold 390 may be integrally formed in a frame shape or may have a structure divided into two or four pieces.

The display unit 400 includes a liquid crystal display panel 410 for displaying an image using light supplied from the backlight assembly 300, and a driving circuit unit 420 for driving the liquid crystal display panel 410.

The liquid crystal display panel 410 includes a first substrate 412, a second substrate 414 coupled to the first substrate 412, and a liquid crystal interposed between the first substrate 412 and the second substrate 414. Layer 416.

The first substrate 412 is a TFT substrate in which thin film transistors (hereinafter referred to as TFTs), which are switching elements, are formed in a matrix form. A data line and a gate line are respectively connected to the source terminal and the gate terminal of the TFTs, and a pixel electrode made of a transparent conductive material is connected to the drain terminal.

The second substrate 414 is a color filter substrate in which RGB pixels for implementing colors are formed in a thin film form. The common electrode made of a transparent conductive material is formed on the second substrate 414.

In the liquid crystal display panel 410 having such a configuration, when power is applied to the gate terminal of the TFT and the TFT is turned on, an electric field is formed between the pixel electrode and the common electrode. By the electric field, the arrangement of the liquid crystal molecules of the liquid crystal layer 416 interposed between the first substrate 412 and the second substrate 414 is changed, and is supplied from the backlight assembly 300 according to the arrangement change of the liquid crystal molecules. The transmittance of light is changed to display an image of a desired gray scale.

The driving circuit unit 420 may include a data printed circuit board 422 for supplying a data driving signal to the liquid crystal display panel 410, a gate printed circuit board 424 for supplying a gate driving signal to the liquid crystal display panel 410, and data printing. A data driving circuit film 426 connecting the circuit board 422 to the liquid crystal display panel 410, and a gate driving circuit film 428 connecting the gate printed circuit board 424 to the liquid crystal display panel 410. . The data driving circuit film 426 and the gate driving circuit film 428 are made of, for example, a tape carrier package (TCP) or a chip on film (COF). Meanwhile, the gate printed circuit board 424 may be removed by forming separate signal wires on the liquid crystal display panel 410 and the gate driving circuit film 428.

The liquid crystal display 200 may further include a top chassis 210 for fixing the display unit 400. The top chassis 210 is coupled to the storage container 310 to fix the edge of the liquid crystal display panel 410. At this time, the data printed circuit board 422 is bent by the data driving circuit film 426 and fixed to the side or the back of the storage container 310. The top chassis 210 is made of, for example, a metal having little deformation and excellent strength.

6 is a cross-sectional view illustrating a backlight assembly according to another exemplary embodiment of the present invention. In the present embodiment, the remaining components except for the formation position of the fluorescent layer are the same as those shown in Fig. 5, the same reference numerals are used for the same components, and detailed description thereof will be omitted.

Referring to FIG. 6, the backlight assembly 500 according to another embodiment includes a storage container 310, a flat plate fluorescent lamp 320, a fluorescent layer 330, a diffusion plate 340, and an optical sheet 350. .

In the present embodiment, the fluorescent layer 330 is formed on the outer surface of the diffusion plate 340, and generates visible light in response to the non-visible light emitted from the flat fluorescent lamp 320.

The fluorescent layer 330 is formed on the bottom surface of the diffusion plate 340. Alternatively, the fluorescent layer 330 may be formed on the upper surface of the diffusion plate 340. In addition, the fluorescent layer 330 may be simultaneously formed on the upper and lower surfaces of the diffusion plate 340.

On the other hand, the fluorescent layer 330 formed on the outer surface of the diffusion plate 340 may be formed at different densities for each position according to the luminance distribution of the invisible light emitted from the flat fluorescent lamp 320. That is, the fluorescent layer 330 is coated with a small amount of the phosphor in the case where the luminance distribution of the invisible light is high, and a large amount of the phosphor is coated in the region where the luminance distribution of the invisible light is low. As described above, since the amount of the phosphor is formed differently according to the luminance distribution of the invisible light, the luminance distribution of the generated visible light can be made uniform.

7 is a cross-sectional view illustrating a backlight assembly according to another embodiment of the present invention. In the present embodiment, the remaining components except for the formation position of the fluorescent layer are the same as those shown in Fig. 5, the same reference numerals are used for the same components, and detailed description thereof will be omitted.

Referring to FIG. 7, the backlight assembly 600 according to another embodiment includes a storage container 310, a flat plate fluorescent lamp 320, a fluorescent layer 330, a diffusion plate 340, and an optical sheet 350. do.

In the present embodiment, the fluorescent layer 330 is formed on the outer surface of the optical sheet 350, and generates visible light in response to the non-visible light emitted from the flat fluorescent lamp 320.

The fluorescent layer 330 is formed on the lower surface of the diffusion sheet or prism sheet included in the optical sheet 350. Alternatively, the fluorescent layer 330 may be formed on the top surface of the diffusion sheet or prism sheet, or simultaneously formed on the top and bottom surfaces of the diffusion sheet or prism sheet.

On the other hand, the fluorescent layer 330 formed on the outer surface of the optical sheet 350 is different depending on the position according to the luminance distribution of the invisible light emitted from the flat fluorescent lamp 320 in order to make the luminance distribution of the visible light uniform. Can be formed to a density.

Meanwhile, the fluorescent layer 330 may be formed inside the diffusion plate 340 or the optical sheet 350 through chemical bonding with the diffusion plate 340 or the optical sheet 350. To this end, the diffusion plate 340 or the optical sheet 350 is manufactured by molding, such as injection, extrusion in a form mixed with a fluorescent material.

According to such a flat panel fluorescent lamp, a backlight assembly and a liquid crystal display having the same, by forming a fluorescent layer that generates visible light in response to invisible light outside the flat fluorescent lamp, it is possible to eliminate the pinhole phenomenon and improve the reliability of the product. have.

In the detailed description of the present invention described above with reference to the preferred embodiments of the present invention, those skilled in the art or those skilled in the art having ordinary skill in the art will be described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

Claims (20)

A lamp body which forms discharge spaces therein by a combination of the lower substrate and the upper substrate, and generates invisible light in response to a driving power input from the outside; And And a first fluorescent layer formed on an outer surface of the upper substrate and generating visible light in response to the invisible light. The flat fluorescent lamp of claim 1, wherein the non-visible light is light in an ultraviolet wavelength band. The method of claim 1, wherein the upper substrate Discharge space parts spaced apart from the lower substrate to form the discharge spaces; Space dividing portions in contact with the lower substrate between the discharge space portions; And And a sealing portion coupled to the lower substrate at an edge of the upper substrate. The flat fluorescent lamp of claim 3, wherein the first fluorescent layer is formed at a position corresponding to the discharge space parts more than the space division parts. The flat fluorescent lamp of claim 1, further comprising a second fluorescent layer formed on an outer surface of the lower substrate. The flat panel fluorescent lamp of claim 1, further comprising a reflective layer formed on at least one of an inner surface and an outer surface of the lower substrate. The flat panel fluorescent lamp of claim 1, further comprising an electrode formed on an outer surface of at least one of the lower substrate and the upper substrate. A storage container; A flat fluorescent lamp housed in the storage container, and configured to form discharge spaces by combining a lower substrate and an upper substrate, and generate invisible light in response to a driving power input from the outside; A fluorescent layer formed outside the flat fluorescent lamp and generating visible light in response to the invisible light; A diffusion plate disposed on the flat fluorescent lamp; And And at least one optical sheet disposed on the diffusion plate. The backlight assembly of claim 8, wherein the fluorescent layer is formed on an outer surface of the upper substrate of the flat fluorescent lamp. The backlight assembly of claim 8, wherein the fluorescent layer is formed on an outer surface of the upper substrate and an outer surface of the lower substrate of the flat fluorescent lamp. The backlight assembly of claim 8, wherein the fluorescent layer is formed on an outer surface of the diffusion plate. The backlight assembly of claim 11, wherein the fluorescent layer is formed at a non-uniform density according to the luminance distribution of the flat fluorescent lamp. The backlight assembly of claim 8, wherein the optical sheet comprises a diffusion sheet, and the fluorescent layer is formed on an outer surface of the diffusion sheet. The backlight assembly of claim 8, wherein the optical sheet comprises a prism sheet, and the fluorescent layer is formed on an outer surface of the prism sheet. The backlight assembly of claim 8, wherein the fluorescent layer is formed in the diffuser plate through chemical bonding with the diffuser plate. The backlight assembly of claim 8, wherein the fluorescent layer is formed in the optical sheet through chemical bonding with the optical sheet. The backlight assembly of claim 8, wherein the fluorescent layer is formed on an outer surface of the flat fluorescent lamp and an inner surface of the storage container. The method of claim 8, wherein the upper substrate Discharge space parts spaced apart from the lower substrate to form the discharge spaces; Space dividing portions in contact with the lower substrate between the discharge space portions; And And a sealing portion coupled to the lower substrate at an edge of the upper substrate. The method of claim 8, wherein the flat fluorescent lamp A reflective layer formed on at least one of an inner surface and an outer surface of the lower substrate; And And an electrode formed on an outer surface of at least one of the lower substrate and the upper substrate. A backlight assembly for supplying light; And And a display unit including a liquid crystal display panel for displaying an image using light from the backlight assembly, and a driving circuit unit for driving the liquid crystal display panel. The backlight assembly A storage container; A flat fluorescent lamp housed in the storage container, and configured to form discharge spaces by combining a lower substrate and an upper substrate, and generate invisible light in response to a driving power input from the outside; A fluorescent layer formed outside the flat fluorescent lamp and generating visible light in response to the invisible light; A diffusion plate disposed on the flat fluorescent lamp; And And optical sheets disposed on the diffusion plate.

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