KR20070034679A - Back light assembly and liquid crystal display device having same - Google Patents

Abstract

Disclosed are a backlight assembly and a liquid crystal display having the same, which can prevent damage to a lamp. The backlight assembly includes a container, a plurality of lamps and a lamp fixing member. The storage container consists of a bottom portion and a side portion to form a storage space. The lamps are arranged parallel to each other on the bottom of the container. The lamp fixing member is coupled to the bottom to fix the lamps, the body portion extending in a direction perpendicular to the longitudinal direction of the lamp, at least one buffer portion protruding along the longitudinal direction of the lamp from the body portion and upward from the buffer portion It includes a lamp fixing protruding into the. Thus, by forming the lamp fixing portion in the buffer portion protruding from the body portion in the longitudinal direction of the lamp, it is possible to cushion the external shock applied to the lamp and to prevent the lamp from being damaged.

Description

BACK LIGHT ASSEMBLY AND LIQUID CRYSTAL DISPLAY DEVICE 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 cross-sectional view illustrating a combined cross section of the backlight assembly illustrated in FIG. 1.

4 is an enlarged view illustrating a buffer part of the lamp fixing member illustrated in FIG. 2.

FIG. 5 is a diagram illustrating another embodiment of the buffer part shown in FIG. 4.

6 is a graph showing the flow amount of the lamp fixing portion during the impact test.

7 is a graph showing the stress of the lamp during the impact test.

8 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: buffer portion

430: lamp fixing portion 440: diffuser plate support

450: coupling portion 120: diffusion plate

130: optical sheet 140: side mold

700: liquid crystal display 800: display unit

810: liquid crystal display panel 820: driving circuit

910: middle mold 920: top chassis

The present invention relates to a backlight assembly and a liquid crystal display having the same, and more particularly, to a backlight assembly and a liquid crystal display having the same that can improve the impact resistance of the lamps.

In general, a 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. Has 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 a relatively small liquid crystal display device such as a notebook, while the direct type is mainly used for a large liquid crystal display device requiring high brightness such as a TV.

In the case of the direct type backlight assembly, as the size of the LCD 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 body portion extending in a direction perpendicular to the longitudinal direction of the lamp, and a lamp fixing portion protruding upward from the body portion, and the lamp fixing portion has an opening for insertion of the lamp.

However, when an impact is applied from the outside while the lamp is fixed to the lamp fixing part, a high stress is generated at the lamp fixing part holding the lamp, causing a problem that the lamp is broken.

Accordingly, the present invention has been made in view of such a conventional problem, and the present invention provides a backlight assembly capable of stably fixing the lamp against external impact and preventing damage to the lamp.

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

The backlight assembly according to an aspect of the present invention includes a storage container, a plurality of lamps and a lamp fixing member. The storage container consists of a bottom portion and a side portion to form a storage space. The lamps are arranged parallel to each other on the bottom of the container. The lamp fixing member is coupled to the bottom part to fix the lamps, a body part extending in a direction crossing the lamp, at least one buffer part protruding from the body part in the longitudinal direction of the lamp, and the buffer. And a lamp fixing portion protruding upward from the portion.

According to another aspect of the present invention, a backlight assembly includes a storage container, a plurality of lamps disposed in parallel to each other inside the storage container, and a lamp fixing member. The lamp fixing member has a body portion formed in a direction crossing the lamp, a soft buffer portion protruding from the body portion in the longitudinal direction of the lamp and flowing in a flow direction of the lamps when impacted, and an upward direction from the buffer portion. It includes a lamp fixing protruding into the.

A liquid crystal display according to an aspect of the present invention includes a backlight assembly and a display unit. The backlight assembly may include a storage container including a bottom portion and a side portion, a plurality of lamps disposed in parallel with each other on a bottom portion of the storage container, and a lamp fixing member coupled to the bottom portion to fix the lamps. The lamp fixing member may include a body portion extending in a direction crossing the lamp, at least one buffer portion protruding from the body portion in the longitudinal direction of the lamp, and a lamp fixing portion protruding upward from the buffer portion. Include. The display unit includes 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.

According to the backlight assembly and the liquid crystal display having the same, by forming the lamp fixing portion in the buffer portion protruding from the body portion in the longitudinal direction of the lamp, it is possible to cushion the external shock applied to the lamp and to prevent the lamp from being damaged. have.

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

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 embodiment of the present invention includes a storage container 200, a plurality of lamps 300, 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 low deformation.

User holes 212 are formed in the bottom portion 210 of the storage container 200. The backlight assembly 100 is coupled to an external case (not shown) through a user hole 212 formed in the bottom portion 210 of the storage container 200.

The lamps 300 are disposed 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 made of a cold Cathode Fluorescent Lamp (CCFL) having an elongated cylindrical shape. 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 fitted into and fixed to the lamp holders 310, and the lamp holders 310 are coupled to and fixed to the storage container 200.

The lamp fixing member 400 is coupled to the bottom portion 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 are arranged in a zigzag form along a direction perpendicular to the length direction of the lamp 300. When the lamp fixing members 400 are disposed in a straight line, a poor quality such as a dark line in which only the region where the lamp fixing members 400 are located may appear dark may occur. Therefore, by arranging the lamp fixing members 400 in a zigzag form so as not to be disposed in a straight line, quality defects such as dark lines can be removed.

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 are disposed in a zigzag form along a direction perpendicular to the longitudinal direction of the lamp 300.

The backlight assembly 100 further includes a diffuser plate 120 disposed on the lamps 300. The diffusion plate 120 diffuses the light generated from the lamps 300 to improve the brightness uniformity of the light. The diffusion plate 120 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 120 is made of a transparent material for transmitting light, and includes a diffusion agent for diffusing light. The diffusion plate 120 is made of, for example, polymethyl methacrylate (PMMA) material.

The backlight assembly 100 further includes at least one optical sheet 130 disposed on the diffuser plate 120. The optical sheet 130 changes the path of the light diffused through the diffusion plate 120 to improve the luminance characteristic. The optical sheet 130 may include a light collecting sheet for condensing the light diffused through the diffusion plate 120 in the front direction to improve the front brightness of the light. In addition, the optical sheet 130 may include a diffusion sheet for diffusing the light diffused through the diffusion plate 120 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 backlight assembly 100 may further include side molds 140 disposed corresponding to both ends of the lamps 300. The side mold 140 is coupled to the receiving container 200 while covering both ends of the lamps 300. The side mold 140 shields both ends of the lamps 300 that are relatively lower in brightness than other areas, that is, the electrode area of the lamp 300 to remove the brightness unevenness. In addition, the side mold 140 guides the storage position of the diffusion plate 120 while supporting the edge of the diffusion plate 120 disposed above.

Although not shown, the backlight assembly 100 may further include a middle mold for fixing the diffusion plate 120 and the optical sheet 130. The middle mold is combined with the receiving container 200 from the top of the optical sheet 130 to fix the edges of the diffusion plate 120 and the optical sheet 130.

FIG. 2 is a perspective view illustrating in detail the lamp fixing member illustrated in FIG. 1, and FIG. 3 is a cross-sectional view illustrating a combined cross section of the backlight assembly illustrated in FIG. 1.

2 and 3, the lamp fixing member 400 includes a body part 410, a buffer part 420, and a lamp fixing part 430.

The body portion 410 is formed to extend in a direction crossing the lamp 300.

The buffer part 420 is formed to protrude along the longitudinal direction of the lamp 300 from the body part 410. The lamp fixing member 400 includes one or more buffer parts 420. In FIG. 2, the lamp fixing member 400 includes four buffer parts 420.

The buffer parts 420 are formed in a zigzag shape along the longitudinal direction of the body part 410. In contrast, the buffer parts 420 may be formed to protrude in the same direction from one side of the body part 410.

When the shock absorbing part 420 is applied from the outside, the shock absorbing part 420 has a ductile property to absorb the shock while flowing in the same direction as the lamp 300 flows.

One lamp fixing part 430 is formed in each of the buffer parts 420. The lamp fixing part 430 is formed to protrude upward from the buffer part 420.

The lamp fixing part 430 has an opening 432 for inserting the lamp 300. The width of the opening 432 is determined according to the straightness of the lamp 300. The larger the width of the opening 432, the easier it is to insert the lamp 300 into the lamp fixing portion 430. However, if the width of the opening 432 is too large, the lamp 300 can be easily removed from the lamp fixing portion 430. Can be disengaged. Thus, the width of the opening 432 of the lamp fixing portion 430 preferably ranges from about 80% to about 90% of the diameter of the lamp 300. For example, when the diameter of the lamp 300 is about 4 mm, the width of the opening 432 is formed to be about 3.3 mm.

The lamp fixing member 400 further includes at least one diffuser support 440 for supporting the diffuser plate 120. The diffusion plate support part 440 is formed at the center of the body part 410. When there are two or more diffuser plate supports 440, the diffuser plate supports 440 are spaced at regular intervals and are formed in the body 410.

The diffusion plate support part 440 protrudes to a position higher than the lamp fixing part 430 to support the diffusion plate 120. As the diffusion plate 120 becomes larger, the center portion sags downward. Accordingly, the diffusion plate support 440 prevents the diffusion plate 120 from sagging to maintain a constant distance between the lamp 300 fixed to the lamp fixing part 430 and the diffusion plate 120.

The lamp fixing member 400 further includes at least one coupling part 450 for coupling with the storage container 200. Coupling portion 450 is formed on the lower surface of the body portion 410 opposite to the forming surface of the diffusion plate support 440. The coupling part 450 is formed at a position corresponding to the diffusion plate support part 440. On the contrary, the formation position and the number of the coupling parts 450 may be variously modified.

Meanwhile, the backlight assembly 100 further includes a reflecting plate 150 disposed between the storage container 200 and the lamps 300. The reflector plate 150 reflects the light generated from the lamps 300 toward the diffuser plate 120 to improve light utilization efficiency. The reflecting plate 150 is attached to the bottom 210 and fixed, for example.

The reflector plate 150 and the bottom portion 210 of the storage container 200 are opened to correspond to the coupling portion 450 of the lamp fixing member 400. The coupling part 450 penetrates through the open areas of the reflector plate 150 and the bottom part 210, and then is hooked with the bottom part 210.

4 is an enlarged view illustrating a buffer part of the lamp fixing member illustrated in FIG. 2.

Referring to FIG. 4, the buffer part 430 protrudes from the body part 410 in a straight line along the longitudinal direction of the lamp 300. The protruding length of the buffer portion 430 ranges from about 5 mm to about 20 mm.

FIG. 5 is a diagram illustrating another embodiment of the buffer part shown in FIG. 4.

Referring to FIG. 5, the buffer part 430 protrudes from the body part 410 in a curved shape along the longitudinal direction of the lamp 300. That is, the buffer unit 430 has a shape in which the width decreases as the distance from the body portion 410 increases, and the width increases again. The protruding length of the buffer portion 430 has a range of about 5 mm to about 20 mm.

6 is a graph showing the flow amount of the lamp fixing portion during the impact test. In FIG. 6, graph 1 (G1) is a graph showing the amount of flow in the up and down direction of the part for fixing the lamp when the lamp fixing portion is formed in the buffer portion as shown in Figure 4, graph 2 (G2) is a lamp fixing portion When it is formed in the body portion is a graph showing the amount of flow in the vertical direction of the part for fixing the lamp.

4 and 6, as shown in graph 1 (G1), when the lamp 300 is fixed to the lamp fixing part 430 formed in the buffer part 420, the instantaneous impact lamp 300 is opened. It can be seen that the holding portion flows in the vertical direction from about 1.1 mm to about 1.2 mm. On the other hand, as shown in graph 2 (G2), when the lamp is fixed to the lamp fixing portion formed in the body portion, it can be seen that there is almost no flow of the portion holding the lamp at the moment of impact.

As shown in graph 1 (G1), when the portion holding the lamp 300 flows up and down at the moment of impact, the lamp 300 is bent by absorbing the impact energy applied to the portion holding the lamp 300. Can be mitigated.

7 is a graph showing the stress of the lamp during the impact test. In FIG. 7, graph 3 (G3) is a graph showing the stress of the lamp when the lamp fixing part is formed in the buffer part as shown in FIG. 4, and graph 4 (G4) is a graph of the lamp when the lamp fixing part is formed in the body part. It is a graph showing stress.

4 and 7, when the lamp 300 is fixed to the lamp fixing part 430 formed in the buffer part 420, as shown in graph 3 (G3), the moment of impact lamp 300 is The maximum stress was about 89.5 MPa. On the other hand, as shown in Graph 4 (G4), when the lamp is fixed to the lamp fixing portion formed in the body portion, the maximum stress of the lamp at the moment of impact was about 109.2 MPa.

Therefore, when the lamp 300 is fixed to the lamp fixing part 430 formed in the shock absorbing part 420, the maximum stress that the lamp 300 receives is greater than that when the lamp is fixed to the lamp fixing part formed in the body part. It can be seen that the decrease by about 18%.

As such, the lamp fixing part 430 and the shock absorbing part 420 holding the lamp 300 flow in the vertical direction at the moment of impact, thereby significantly reducing the bending stress received by the lamp 300 compared with the existing structure. This improves the risk of breakage of the lamp 300.

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

Referring to FIG. 8, the liquid crystal display 700 according to the exemplary embodiment includes a backlight assembly 100 for supplying light and a display unit 800 for displaying an image.

Since the backlight assembly 100 has the same structure as shown in FIGS. 1 to 5, 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. Due to this electric field, 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, and is supplied from the backlight assembly 100 according to the arrangement change of the liquid crystal molecules. The transmittance of light to be changed is displayed 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 receiving 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 disposed on the side or 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 130 and the liquid crystal display panel 810. The middle mold 910 supports the liquid crystal display panel 810 while fixing the optical sheet 130 and the diffusion plate 120. 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 liquid crystal display 700 may further include a top chassis 920 for fixing the display unit 800. 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 backlight assembly and a liquid crystal display having the same, by forming the lamp fixing portion in the buffer portion protruding in the longitudinal direction of the lamp from the body portion of the lamp fixing member, the lamp to reduce the maximum stress of the lamp against external impact Can be damaged.

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 (17)

A storage container formed of a bottom portion and a side portion to form a storage space; A plurality of lamps disposed in parallel with each other on the bottom of the storage container; And A body part coupled to the bottom part to fix the lamps, the body part extending in a direction crossing the lamp, at least one buffer part protruding from the body part in a longitudinal direction of the lamp, and an upward direction from the buffer part; And a lamp fixing member having a protruding lamp fixing part. The backlight assembly of claim 1, wherein the buffer part protrudes in a zigzag shape along a length direction of the body part. The backlight assembly of claim 1, wherein the buffer part protrudes in a straight line along the longitudinal direction of the lamp. The backlight assembly of claim 1, wherein the buffer part protrudes in a curved shape along a length direction of the lamp. The backlight assembly of claim 1, wherein the lamp fixing part has an opening for insertion of the lamp. The backlight assembly of claim 1, further comprising a diffuser plate disposed on top of the lamps to diffuse light from the lamps. The backlight assembly of claim 6, wherein the lamp fixing member further comprises a diffusion plate supporter for supporting the diffusion plate. The backlight assembly of claim 7, wherein the diffusion plate support part is formed at the center of the body part. The backlight assembly of claim 1, wherein the lamp fixing member further comprises a coupling part formed at a lower surface of the body part and coupled to a bottom part of the storage container. The backlight assembly of claim 1, wherein the lamp fixing member is disposed in a zigzag form along a direction perpendicular to the longitudinal direction of the lamp. The backlight assembly of claim 1, wherein a user hole for coupling with an outer case is formed at a bottom of the storage container. Storage container; A plurality of lamps arranged in parallel to each other inside the storage container; And A body portion formed in a direction intersecting the lamp, a soft buffer portion protruding from the body portion in the longitudinal direction of the lamp and flowing in a flow direction of the lamps upon impact, and a lamp height protruding upward from the buffer portion; A backlight assembly comprising a lamp fixing member having a government. A backlight assembly including a storage container including a bottom part and a side part, a plurality of lamps disposed in parallel with each other on a bottom part of the storage container, and a lamp fixing member coupled to the bottom part to fix the lamps; 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 lamp fixing member Body portion extending in the direction crossing the lamp, At least one buffer portion protruding from the body portion along the longitudinal direction of the lamp, and And a lamp fixing part protruding upward from the buffer part. The liquid crystal display device of claim 13, wherein the buffer part is formed in a zigzag shape along a length direction of the body part. The method of claim 13, wherein the backlight assembly further comprises a diffusion plate disposed on top of the lamps, And the lamp fixing member further comprises a diffusion plate supporter for supporting the diffusion plate. The liquid crystal display device of claim 13, wherein the lamp fixing member further comprises a coupling part formed on a lower surface of the body part and coupled to a bottom part of the storage container. The liquid crystal display of claim 13, wherein a user hole is formed at a bottom of the storage container to be coupled to an outer case.

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