KR20070063665A - Lamp fixing member, back light assembly and liquid crystal display apparatus having the same - Google Patents

Abstract

A lamp fixing member, a backlight assembly and an LCD(Liquid Crystal Display) comprising the same are provided to reduce the temperature deviation of the lamp fixing member, thereby removing the display defect due to the temperature deviation, by fixing a lamp through a thin fixing band so as to minimize the contact area between the lamp and the lamp fixing member. At least one lamp fixing part(420) is formed on an upper surface of a body(410), wherein the lamp fixing part has a groove for fixing a lamp. A diffusing plate supporting part(430) is formed on the upper surface of the body, wherein the diffusing plate supporting part has a higher height than the lamp fixing part. A thin fixing band(440) is inserted into the groove of the lamp fixing part, wherein the thin fixing band fixes an upper portion of the lamp.

Description

Lamp fixing member, backlight assembly and liquid crystal display device having same {LAMP FIXING MEMBER, BACK LIGHT ASSEMBLY AND LIQUID CRYSTAL DISPLAY APPARATUS HAVING THE SAME}

1 is an exploded perspective view showing a backlight assembly according to an embodiment of the present invention.

2 is a perspective view showing in detail the lamp fixing member shown in FIG.

3 is a side view of the lamp fixing member shown in FIG. 2.

4 is an enlarged view illustrating an enlarged portion A of FIG. 2.

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

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

100: backlight assembly 200: storage container

300: lamp 400: lamp fixing member

410: body portion 420: lamp fixing portion

430: diffusion plate support 440: fixing band

450: body coupling portion 350: diffusion plate

360: optical sheet 370: side mold

810: liquid crystal display panel 820: driving circuit

910: middle mold 920: top chassis

The present invention relates to a lamp fixing member, a backlight assembly and a liquid crystal display device having the same, and more particularly to a lamp fixing member, a backlight assembly and a liquid crystal display device having improved lamp assembly, and display quality can be improved It is about.

In general, the liquid crystal display is a flat panel display that displays an image using liquid crystal, and is thinner and lighter than other display devices, and has advantages such as low driving voltage and low power consumption. Due to these advantages, liquid crystal displays are used in various products such as notebooks, monitors, and TVs.

Since the liquid crystal display device is a non-light emitting device in which a liquid crystal display panel for displaying an image does not emit light by itself, it requires a backlight assembly for supplying light to the liquid crystal display panel.

The backlight assembly includes a lamp for generating light. In this case, a cold cathode fluorescent lamp (CCFL) having a long thin cylindrical shape is mainly used. The backlight assembly is classified into an edge type and a direct type according to the position of the lamp.

The edge type is a method in which one or two lamps are positioned on the side of the transparent light guide plate and the light obtained by multiple reflection of light using one side of the light guide plate is emitted to the liquid crystal display panel. The direct type is a method of reflecting and diffusing the light emitted from the lamp by placing a plurality of lamps directly under the liquid crystal display panel, a diffuser plate on the front of the lamp and a reflector plate on the back of the lamp. Therefore, the edge type is used for relatively small liquid crystal display devices such as notebooks and monitors, while the direct type is mainly used for large liquid crystal display devices requiring high brightness such as TVs.

In the case of the direct type backlight assembly, as the size of the liquid crystal display increases, the length of the lamp becomes longer and the size of the diffusion plate becomes larger. Accordingly, the backlight assembly includes a lamp fixing member that supports the diffuser plate while fixing the lamp.

The lamp fixing member includes a lamp fixing part for fixing the lamp and a diffusion plate support part for supporting the diffuser plate. In general, the lamp fixing portion has a circular clip shape in which a portion of the upper portion is opened to a size smaller than the diameter of the lamp.

In such a structure, it is impossible to automate the assembly of the lamp, and thus, the lamp must be coupled to the lamp fixing unit by the operator's manual operation, resulting in a complicated assembly process and a long process time.

In addition, since the temperature difference occurs in the lamp area fixed by the lamp fixing part compared with other areas, there is a problem in that a display quality defect such as a dark part occurs.

In addition, there is a problem that a cracking phenomenon occurs on the surface of the diffusion plate by the hard diffusion plate support portion supporting the diffusion plate.

Accordingly, the present invention has been made in view of such a conventional problem, and the present invention provides a lamp fixing member capable of improving the assemblability of assembling a lamp to the lamp fixing member and improving display quality.

In addition, the present invention provides a backlight assembly having the lamp fixing member.

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

Lamp fixing member according to an aspect of the present invention includes a body portion, lamp fixing portion, diffuser plate support and fixing band. The lamp fixing portion is formed on the upper surface of the body portion, and has a groove for fixing the lamp. The diffusion plate support part is formed on an upper surface of the body part and protrudes to a higher height than the lamp fixing part. The fixing band has a band shape to fix an upper portion of the lamp inserted into the groove of the lamp fixing part.

According to an aspect of the present invention, a backlight assembly includes a storage container, lamps, a diffusion plate, and a lamp fixing member. The lamps are stored parallel to each other in the storage container. The diffuser plate is disposed on top of the lamps. The lamp fixing member is coupled to the storage container. The lamp fixing member is formed on the body portion extending in the direction crossing the lamps, the upper surface of the body portion and at least one lamp fixing portion having a groove for fixing the lamp, formed on the upper surface of the body portion and the diffusion And a band-shaped fixing band for fixing the lamp inserted into the groove of the lamp fixing part.

A liquid crystal display according to an aspect of the present invention includes a backlight assembly for supplying light, a display unit disposed on the backlight assembly to display an image, and a top chassis to fix the display unit. The backlight assembly includes a storage container, lamps, a diffusion plate and a lamp fixing member. The lamps are stored parallel to each other in the storage container. The diffuser plate is disposed on top of the lamps. The lamp fixing member is coupled to the storage container. The lamp fixing member is formed on the body portion extending in the direction crossing the lamps, the upper surface of the body portion and at least one lamp fixing portion having a groove for fixing the lamp, formed on the upper surface of the body portion and the diffusion And a band-shaped fixing band for fixing the lamp inserted into the groove of the lamp fixing part.

According to the lamp fixing member, the backlight assembly and the liquid crystal display device having the same, the lamp assembly can be automated to improve lamp assembly, reducing the temperature variation of the lamp fixing portion, and eliminating the gap of the diffusion plate. The display quality can be improved.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention.

1 is an exploded perspective view showing a backlight assembly according to an embodiment of the present invention.

Referring to FIG. 1, the backlight assembly 100 according to an exemplary embodiment includes a storage container 200, a plurality of lamps 300, a diffusion plate 350, and a lamp fixing member 400.

The storage container 200 includes a bottom portion 210 and a side portion 220 extending from an edge of the bottom portion 210 to form a storage space. The storage container 200 is, for example, made of a metal having excellent strength and little deformation.

The first diffusion plate guide part 222 may be formed at the side portion 220 corresponding to the long side direction of the storage container 200 to guide the fixed position of the diffusion plate 350. The first diffusion plate guide part 222 protrudes from the upper surface of the side part 220 to a predetermined height to guide the storage position of the diffusion plate 350.

The lamps 300 are arranged parallel to each other on the bottom portion 210 of the storage container 200. The lamps 300 generate light in response to driving power applied from the outside. The lamps 300 are formed of a long cylindrical cold cathode fluorescent lamp (CFL). In contrast, the lamps 300 may be formed of an external electrode fluorescent lamp (EEFL) having external electrodes formed at both ends thereof. In addition, the lamps 300 may have a structure bent in a U shape.

Both ends of the lamps 300 are fixed by a lamp socket 310 that is fixed to the storage container 200.

The diffusion plate 350 is disposed above the lamps 300. The diffusion plate 350 diffuses the light generated from the lamps 300 to improve the brightness uniformity of the light. The diffusion plate 350 is formed in a plate shape having a predetermined thickness and is spaced apart from the lamps 300 by a predetermined distance.

The diffusion plate 350 is made of a transparent material for transmitting light, and includes a diffusion agent for diffusing light. The diffusion plate 350 is made of, for example, polymethyl methacrylate (PMMA) material.

The backlight assembly 100 may further include at least one optical sheet 360 disposed on the diffuser plate 350. The optical sheet 360 changes the path of the light diffused through the diffusion plate 350 to improve the luminance characteristic. The optical sheet 360 may include a light collecting sheet for condensing the light diffused through the diffusion plate 350 in the front direction to improve the front brightness of the light. In addition, the optical sheet 360 may include a diffusion sheet for diffusing the light diffused through the diffusion plate 350 once again. Meanwhile, the backlight assembly 100 may further include an optical sheet having various functions, such as a reflective polarizing sheet, in accordance with required luminance characteristics.

The lamp fixing member 400 is fixed to the bottom 210 of the storage container 200 to fix the lamps 300. Since the longer the length of the lamp 300, the greater the possibility of bending or deformation, the lamp fixing member 400 to stably fix the central portion of the lamp 300 to prevent sagging and deformation of the lamp 300.

The number of lamp fixing members 400 is determined according to the number of lamps 300. For example, four lamps 300 are fixed to one lamp fixing member 400. When there are two or more lamp fixing members 400, the lamp fixing members 400 may be disposed in a zigzag form along a direction perpendicular to the longitudinal direction of the lamp 300 to prevent display defects such as dark lines. .

Each lamp 300 is fixed by one lamp fixing member 400. However, when the length of the lamp 300 is longer, by increasing the number of the lamp fixing member 400, each lamp 300 is at least two lamp holding members spaced apart by a predetermined distance along the longitudinal direction ( 400). Even in this case, the lamp fixing members 400 may be disposed in a zigzag form along a direction perpendicular to the longitudinal direction of the lamp 300.

The backlight assembly 100 may further include side molds 370 disposed corresponding to both ends of the lamps 300. The side mold 370 is coupled to the storage container 200 while covering both ends of the lamps 300. The side mold 370 covers both ends of the lamps 300 having lower luminance than other regions, that is, the electrode region of the lamp 300 to eliminate luminance unevenness.

The side mold 370 supports an edge of the diffusion plate 350 while supporting an edge of the diffusion plate 350 disposed thereon. In the side mold 370, a second diffusion plate guide part 372 may be formed to guide the fixed position of the short side of the diffusion plate 350. The second diffusion plate guide part 372 protrudes from the upper surface of the side mold 370 to a predetermined height to guide the storage position of the diffusion plate 350.

Although not shown, the backlight assembly 100 may further include a middle mold for fixing the diffusion plate 350 and the optical sheet 360. The middle mold is combined with the storage container 200 from the top of the optical sheet 360 to fix the edges of the diffusion plate 350 and the optical sheet 360.

FIG. 2 is a perspective view showing in detail the lamp fixing member shown in FIG. 1, FIG. 3 is a side view of the lamp fixing member shown in FIG. 2, and FIG. 4 is an enlarged view of an enlarged portion A of FIG. 2.

2, 3, and 4, the lamp fixing member 400 includes a body 410, a lamp fixing part 420, a diffuser plate supporting part 430, and a fixing band 440.

The body portion 410 is formed to extend in a direction crossing the lamps 300. Body portion 410 includes a band coupling portion 412 for coupling with the fixing band 440. Band coupling portion 412 is formed to protrude in the form of hooks on both ends of the body portion 410.

One or more lamp fixing parts 420 are formed on an upper surface of the body part 410. The lamp fixing part 420 has a groove 422 for fixing the lamp 300. The groove 422 of the lamp fixing part 420 is preferably formed larger than the size of the lamp 300 so that the lamp 300 is easily inserted.

One or more lamp fixing parts 420 are formed on both sides of the diffuser plate support part 430. For example, the lamp fixing member 400 includes a total of four lamp fixing parts 420 disposed on each side of the lamp fixing member 400 on two sides. Alternatively, the lamp fixing member 400 may have various numbers of lamp fixing parts 420.

The lamp fixing part 420 has a band fixing groove 424 for fixing the position of the fixing band 440. The band fixing groove 424 is formed at the top of the lamp fixing part 420 so that the fixing band 440 can fix the upper portion of the lamp 300 inserted into the groove 422 of the lamp fixing part 420.

The lamp fixing part 420 includes at least one contact protrusion 426 to reduce the contact area with the lamp 300. The contact protrusion 426 is in point contact with the lamp 300 formed and inserted into the inner surface of the lamp fixing part 420 forming the groove 422. For example, the contact protrusions 426 are formed on each side of the lamp 300 so that the lamp 300 can be stably contacted.

The fixing band 440 is disposed on the upper part of the lamp fixing part 420 to fix the upper part of the lamp 300 inserted into the groove 422. The fixing band 440 includes a coupling ring 442 for coupling with the band coupling portion 412 of the body portion 410. The coupling ring 442 is formed at both ends of the fixing band 440 corresponding to the band coupling portion 412 of the body portion 410. The coupling ring 442 is fitted into the hook-shaped band coupling portion 412 to be fixed.

The fixing band 440 is preferably formed of a material having a predetermined elasticity to cushion the external impact applied to the lamp 300. For example, the fixing band 440 is formed of a silicon material. In addition, the fixing band 440 has a thin band shape to minimize the portion in direct contact with the lamp 300.

As such, the lamp 300 inserted into the groove 422 of the lamp fixing part 420 is fixed in a state where at most three parts are in point contact by the contact protrusion 426 and the fixing band 440. Therefore, by forming a contact projection 426 on the lamp fixing portion 420, and using a narrow band-shaped fixing band 440 to minimize the contact area with the lamp 300, the fixed area of the lamp 300 By reducing the temperature deviation between the and other areas, display defects such as dark areas due to the temperature deviation can be reduced.

The diffusion plate support part 430 is formed on the upper surface of the body part 410 and protrudes to a height higher than the lamp fixing part 420 to support the diffusion plate 350 (shown in FIG. 1). As the diffusion plate 350 becomes larger, the center portion sags downward. Therefore, the diffusion plate support part 430 prevents sagging of the diffusion plate 350 to maintain a constant distance between the lamp 300 fixed to the lamp fixing part 420 and the diffusion plate 350. The diffuser plate support 430 has a conical shape, for example.

The body 410, the lamp fixing part 420, and the diffusion plate support part 430 are integrally formed of the same material. For example, the body 410, the lamp fixing part 420, and the diffusion plate support part 430 are formed of a plastic material.

As such, since the diffusion plate support part 430 is formed of a plastic material having a predetermined hardness to firmly support the diffusion plate 350, the diffusion plate 350 may be divided by impact and vibration.

Therefore, the lamp fixing member 400 may further include a diffusion plate cover 432 for preventing a split phenomenon of the diffusion plate 350. The diffuser cover 432 is fitted to the top of the diffuser support 430. The diffusion plate cover 432 is formed of a silicon material having a predetermined elasticity for soft contact with the diffusion plate 350.

The lamp fixing member 400 further includes at least one body coupling portion 450 formed on the bottom surface of the body portion 410 for coupling with the storage container 200 (shown in FIG. 1). The body coupling part 450 penetrates through the open area of the bottom part 210 of the storage container 200, and then is hooked with the bottom part 210. Forming position and the number of the body coupling portion 450 may be variously modified.

On the other hand, the assembly process of the lamp 300 proceeds through an automated machine. First, the lamp fixing member 400 in a state in which the fixing band 440 is separated is coupled to the storage container 200. Thereafter, the lamps 300 are mounted in the grooves 422 of the lamp fixing part 420 through an automated machine. Thereafter, the coupling ring 442 of the fixing band 440 is coupled to the band coupling portion 412 of the body portion 410.

As such, by mounting the lamps 300 through an automated process, the assembly process of the lamp 300 may be simplified and the assembly time may be shortened.

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

Referring to FIG. 5, the liquid crystal display 700 according to an exemplary embodiment of the present invention fixes the backlight assembly 100 for supplying light, the display unit 800 for displaying an image, and the display unit 800. Top chassis 920 for the purpose of operation.

Since the backlight assembly 100 has the same structure as shown in FIGS. 1 to 4, the same reference numerals are used for the same components, and detailed description thereof will be omitted.

The display unit 800 includes a liquid crystal display panel 810 for displaying an image using light supplied from the backlight assembly 100, and a driving circuit unit 820 for driving the liquid crystal display panel 810.

The liquid crystal display panel 810 includes a first substrate 812, a second substrate 814 coupled to the first substrate 812, and a liquid crystal interposed between the first substrate 812 and the second substrate 814. Layer 816.

The first substrate 812 is a substrate in which a thin film transistor (hereinafter, referred to as TFT), which is a switching element, is formed in a matrix form. For example, the first substrate 812 is made of glass. 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 814 is a substrate in which an RGB color filter for realizing color is formed in a thin film form. The second substrate 814 is made of, for example, a glass material. The common electrode made of a transparent conductive material is formed on the second substrate 814.

In the liquid crystal display panel 810 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. The arrangement of the liquid crystal molecules of the liquid crystal layer 816 interposed between the first substrate 812 and the second substrate 814 is changed by this electric field, and is supplied from the backlight assembly 100 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 820 may include a data printed circuit board 822 for supplying a data driving signal to the liquid crystal display panel 810, a gate printed circuit board 824 for supplying a gate driving signal to the liquid crystal display panel 810, and data printing. A data driving circuit film 826 connecting the circuit board 822 to the liquid crystal display panel 810, and a gate driving circuit film 828 connecting the gate printed circuit board 824 to the liquid crystal display panel 810. .

The data driving circuit film 826 and the gate driving circuit film 828 include a driving chip. The data driving circuit film 826 and the gate driving circuit film 828 are formed of, for example, a tape carrier package (TCP) or a chip on film (COF).

The data printed circuit board 822 is disposed on the side or the back of the storage container 200 by the bending of the data driving circuit film 826, and the gate printed circuit board 824 is connected to the bending of the gate driving circuit film 828. It is arranged on the side or the back of the storage container 200 by. Meanwhile, the gate printed circuit board 824 may be removed by forming separate signal wires on the liquid crystal display panel 810 and the gate driving circuit film 828.

The liquid crystal display device 700 may further include a middle mold 910 disposed between the optical sheet 360 and the liquid crystal display panel 810. The middle mold 910 supports the liquid crystal display panel 810 while fixing the optical sheet 360 and the diffusion plate 350. The middle mold 910 is formed integrally in a frame shape. Alternatively, the middle mold 910 may have a structure divided into two pieces having a “C” shape. In addition, the middle mold 910 may have a structure divided into four pieces having an "a" shape.

The top chassis 920 is coupled to the storage container 200 while surrounding the edge of the liquid crystal display panel 810 to fix the liquid crystal display panel 810 to the upper portion of the middle mold 910. The top chassis 920 prevents the liquid crystal display panel 810 from being damaged by an external impact and prevents the liquid crystal display panel 810 from being separated from the middle mold 910. The top chassis 920 is formed integrally in a frame shape. Alternatively, the top chassis 920 may have a structure divided into two pieces having a "c" shape or four pieces having a "a" shape.

According to such a lamp fixing member, the backlight assembly having the same, and the liquid crystal display device, the lamp assembly may be automated, thereby improving assembly of the lamp.

In addition, by forming contact protrusions on the lamp fixing part and minimizing the contact area with the lamp by using a thin band-shaped fixing band, it reduces the temperature deviation between the fixed area and the other area of the lamp, and the dark part due to the temperature deviation. It is possible to eliminate display defects such as these.

In the detailed description of the present invention described above with reference to a preferred embodiment of the present invention, those skilled in the art or those skilled in the art having ordinary knowledge in the scope of the invention 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 (14)

Body portion; At least one lamp fixing part formed on an upper surface of the body part and having a groove for fixing the lamp; A diffusion plate support part formed on an upper surface of the body part and protruding to a higher height than the lamp fixing part; And Lamp fixing member including a band-shaped fixing band for fixing the upper portion of the lamp inserted into the groove of the lamp fixing portion. The lamp fixing member of claim 1, wherein the body part includes band coupling parts protruding in hooks at both ends for coupling with the fixing band. The lamp fixing member of claim 2, wherein the fixing band includes coupling rings formed at both ends and coupled to the band coupling unit. The lamp fixing member of claim 1, wherein the lamp fixing unit has a band fixing groove for fixing the position of the fixing band. The lamp fixing member of claim 1, wherein the lamp fixing part comprises at least one contact protrusion formed on an inner surface of the groove to make point contact with the lamp. The lamp fixing member of claim 1, wherein the fixing band is formed of a silicon material. The lamp fixing member according to claim 1, further comprising a silicon diffusion plate cover fitted to an upper end of the diffusion plate support. The lamp fixing member of claim 1, further comprising a body coupling portion formed on a bottom surface of the body portion for coupling with a storage container. A storage container; A plurality of lamps accommodated in the storage container parallel to each other; A diffuser plate disposed above the lamps; And At least one lamp fixing part coupled to the storage container and extending in a direction crossing the lamps, the upper surface of the body part having a groove for fixing the lamp, and formed on the upper surface of the body part; And a lamp fixing member including a diffusion plate supporter for supporting the diffusion plate and a band-shaped fixing band for fixing an upper portion of the lamp inserted into the groove of the lamp fixing part. The method of claim 9, The body portion includes a band coupling portion protruding in the form of hooks at both ends for coupling with the fixing band, The fixing band includes a coupling ring formed at both ends and coupled to the band coupling portion. The backlight assembly of claim 9, wherein the lamp fixing part comprises at least one contact protrusion formed on an inner surface of the groove to make point contact with the lamp. The backlight assembly of claim 9, wherein the fixing band is formed of a silicon material. 10. The backlight assembly of claim 9, further comprising a diffuser cover made of silicon sandwiched on top of the diffuser support. A backlight assembly for supplying light; A display unit disposed on the backlight assembly to display an image; And A top chassis fixing the display unit, The backlight assembly, Storage Container, A plurality of lamps stored parallel to each other in the storage container; A diffuser plate disposed above the lamps, and At least one lamp fixing part coupled to the storage container and extending in a direction crossing the lamps, the upper surface of the body part having a groove for fixing the lamp, and formed on the upper surface of the body part; And a lamp fixing member having a diffusion plate supporting part for supporting the diffusion plate and a band-shaped fixing band for fixing an upper portion of the lamp inserted into the groove of the lamp fixing part.

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