KR20060078874A - A backlight assembly improving efficiency of discharging heat and a flat display device provided with the same - Google Patents

Abstract

The present invention relates to a backlight assembly having improved heat dissipation efficiency and a flat panel display device having the same. To this end, the backlight assembly according to the present invention includes a frame mold side having a lamp for emitting light, a lamp holder installed at an end of the lamp to support and fix the lamp, and a plurality of stepped portions covering and fixing the lamp holder and extending in an arrangement direction of the lamp. And a bottom chassis for receiving the lamp, the lamp holder and the frame mold side.

Frame mold side, lamp holder, lamp, heat dissipation, step, metal plate

Description

Back light assembly with improved heat dissipation efficiency and flat panel display device with same {A BACKLIGHT ASSEMBLY IMPROVING EFFICIENCY OF DISCHARGING HEAT AND A FLAT DISPLAY DEVICE PROVIDED WITH THE SAME}

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

2 is a combined perspective view of a backlight assembly according to an embodiment of the present invention.

3 is a cross-sectional view taken along line AA of FIG. 2.

4 is an exploded perspective view of a flat panel display device having a backlight assembly according to an exemplary embodiment of the present invention.

The present invention relates to a backlight assembly having improved heat dissipation efficiency and a flat panel display device having the same, and more particularly, to a backlight assembly having a structure capable of efficiently dissipating heat generated from a lamp electrode unit and a flat panel display device having the same. It is about.

With the recent rapid development of semiconductor technology, the demand for liquid crystal display devices that are smaller and lighter and has improved performance is exploding.

Recently, liquid crystal displays (LCDs), which have been in the spotlight, have advantages such as miniaturization, light weight, and low power consumption, and as an alternative means to overcome the disadvantages of the conventional cathode ray tube (CRT). It has been attracting attention and is currently used in almost all information processing equipment that requires a display device.

A general liquid crystal display device applies voltage to a specific molecular array of a liquid crystal to convert it into another molecular array, and visually changes optical properties such as birefringence, photoreactivity, dichroism, and light scattering characteristics of the liquid crystal cell emitted by the molecular array. It is a light-receiving display device which converts into a change and displays information using the modulation of the light by a liquid crystal cell.

Such liquid crystal display devices are gradually employed in large display devices such as TVs. In the case of a large LCD, a plurality of lamps are used as a light source to display a clearer image. In particular, since the length of the lamp is long to weaken the external impact, in order to securely support it, both ends of the lamp are supported by a lamp holder (lamp holder).

Heat generated from the lamp electrode portion when the lamp emits light is conducted to the lamp holder surrounding the lamp electrode portion and is discharged through a bottom chassis in contact with the lamp holder. If such heat dissipation is not performed smoothly, there is a problem that not only the lamp holder fixedly supporting the lamp is deformed by heat radiated from the lamp, but also causes thermal deformation of other parts.                         

In particular, in the case of a large liquid crystal display device, the length of the lamp becomes longer, and current leakage between the lamp electrode portions of both sides and a resulting temperature difference occur. In this case, since the temperature of a hot electrode part rises to 100-120 degreeC, the temperature difference with the cold electrode part which is a ground electrode reaches 40-50 degreeC. The heat generated from the lamp electrode portion affects the liquid crystal display panel of the liquid crystal display panel, thereby deteriorating the liquid crystal, thereby causing malfunctions and incapable of realizing a clear image.

The present invention is to solve the above problems, to provide a backlight assembly having a structure capable of efficiently dissipating heat of the lamp electrode portion.

In addition, the present invention is to provide a flat panel display device having the above-described backlight assembly.

The backlight assembly according to the present invention for achieving the above object, the lamp which emits light, a lamp holder which is installed at the end of the lamp to securely support the lamp, the lamp holder is covered and fixed to the lamp A frame mold side having a plurality of stepped portions extending in an array direction thereof, and a bottom chassis accommodating a lamp, a lamp holder, and a frame mold side.

One of the plurality of stepped portions may be in surface contact with both sides of one corner of the lamp holder.

The backlight assembly according to the present invention further includes a diffuser plate for diffusing the light emitted from the lamp, and the diffuser plate is preferably fixed to another stepped portion among the plurality of stepped portions.

The diffusion plate is preferably spaced apart from the stepped portion as long as it is in surface contact with both sides of the lamp holder.

The frame mold side may be made of a thermally conductive metal material.

Here, the metal may be sus (stainless use steel, stainless steel) or aluminum.

The frame mold side can press-form a plate made of a thermally conductive metal material.

It is preferable that the frame mold side penetrates in the arrangement direction of the lamp.

The frame mold side may be in surface contact with the bottom chassis.

A flat panel display device according to the present invention includes a flat panel display panel for displaying an image, and the above-described backlight assembly for supplying light thereto.

Here, the flat panel display panel may be a liquid crystal display panel.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 4. These embodiments of the present invention are merely for illustrating the present invention, but the present invention is not limited thereto.

1 is an exploded perspective view of a backlight assembly 70 according to an embodiment of the present invention, and shows a direct type backlight assembly mainly used in a large TV.                     

The structure of the backlight assembly 70 shown in FIG. 1 is merely for illustrating the present invention, but the present invention is not limited thereto. Therefore, the present invention can also be applied to backlight assemblies having other structures.

The backlight assembly 70 is formed by combining the optical sheet 72, the diffusion plate 73, the lamp 76, the lamp holder 74 and the like, the backlight assembly 70 is a light emitted from the lamp 76 Is diffused to make it uniform and then released in the Z-axis direction. The bottom chassis 75, which is located under the backlight assembly 70, houses internal components including the lamp 76, the lamp holder 74, and the frame mold side 10, and a mold frame located thereon. A frame 71 is fixedly coupled on the bottom chassis 75.

A plurality of lamps 76 that emit light are arranged to be fixedly spaced apart on the bottom chassis 75 by a predetermined distance, and the reflective sheet 79 is installed on the bottom surface of the bottom chassis 75 to allow the lamps 76 to be installed. Reflect the light emitted from. The lamp 76 may be a cold cathode flourescent lamp (CCFL) or the like. A lamp holder 74 is installed at the end of the lamp 76 to fix and support the lamp 76. The lamp holder 74 is fastened and fixed to the opening 751 (shown in FIG. 3) formed in the bottom chassis 75, so that the lamp 76 may be firmly supported even during transportation or transportation of the backlight assembly 70. The lamp holder 74 is covered and fixed with the frame mold side 10.

Light emitted from the plurality of lamps 76 is evenly spread through the diffusion plate 73. This makes it possible to distribute the light more uniformly. Then, the brightness of the light is improved through the optical sheet 72 positioned on the diffuser plate 73 and supplied to the upper portion. Accordingly, it is possible to supply light with uniformity and improved brightness. As such, since the structure of the backlight assembly 70 is strong, it is strong to external impact.

The back of the bottom chassis 75 is provided with an inverter (not shown) which is a printed circuit board (PCB) for power supply. The inverter outputs light from the lamp 76 by transforming an external power supply to a constant voltage level and applying it to the lamp 76.

As shown in FIG. 1, a plurality of stepped portions 101, 102, 103 are formed in the lamp holder 10. The plurality of stepped portions 101, 102, and 103 may include a first stepped portion 101, a second stepped portion 102, and a third stepped portion 103. In FIG. 1, three stepped portions 101, 102, and 103 are shown, but this is merely to illustrate the present invention, but the present invention is not limited thereto. Therefore, the number of steps may be different. The stepped portions 101, 102, 103 extend along the Y-axis direction, which is the arrangement direction of the lamp 76, and are formed stepwise on the frame mold side 10. The stepped portions 101, 102, 103 can be formed to increase the strength of the frame mold side 10.

Frame mold side 10 of this type can be formed through press molding. That is, a plurality of stepped portions extending in the Y-axis direction can be formed on the frame mold side 10 by press molding and bending a plate made of a thermally conductive metal material. On the other hand, since the lamp opening 105 and the lamp holder opening 107 are formed in the frame mold side 10, the lamp mold 105 may be coupled to the lamp 76 and the lamp holder 74.

Since the frame mold side 10 is manufactured by press molding in this way, the frame mold side 10 is formed to penetrate in the Y-axis direction, which is the arrangement direction of the lamp 76. Since the frame mold side 10 has such a structure, it is elastic to some extent and can be easily attached to or detached from the bottom chassis 75.

FIG. 2 is a perspective view illustrating a backlight assembly 70 according to an embodiment of the present invention, in which all internal components of the backlight assembly 70 illustrated in FIG. 1 are combined.

Here, the frame mold side 10 is preferably formed of a thermally conductive metal material. When the frame mold side 10 is formed of a thermally conductive metal material, heat emitted from the lamp electrode portion is transferred to the lamp holder 74 (shown below in FIG. 1), the frame mold side 10, and the bottom chassis 75. Heat dissipates to the outside while passing through That is, the frame mold side 10 is positioned between the lamp holder 74 and the bottom chassis 75 to efficiently transfer heat emitted from the lamp holder 74 to the bottom chassis 75. Accordingly, heat dissipation through the frame mold side 10 is smoothly performed.

Here, sus or aluminum may be used as the thermally conductive metal material. In some cases, copper may be used. Since the metal material is excellent in thermal conductivity, heat generated from the lamp electrode part can be easily released to the outside. Hereinafter, the above-described heat dissipation structure will be described in more detail with reference to FIG. 3.

FIG. 3 is a cross-sectional view taken along line AA of FIG. 2 and shows a process in which heat generated from the lamp electrode part 761 is discharged.

As shown in FIG. 3, both sides of the side surface 741a and the top surface 741b of the lamp holder 74 meet to form a corner 741. The position of one corner 741 of the lamp holder 74 is here merely to illustrate the invention, but the invention is not limited thereto. So it could be another corner. Since both surfaces 741a and 741b constituting the corner 741 are in surface contact with the first stepped portion 101, the contact area between the frame mold side 10 and the lamp holder 74 is increased and the lamp electrode portion is increased. Heat generated from 761 can be easily released through the lamp holder 74 and the frame mold side 10.

In addition, since the back surface 743 of the frame mold side 10 is in surface contact with the bottom chassis 75, heat dissipation is easily performed through the lamp holder 74 and the frame mold side 10 as indicated by the arrow.

The diffusion plate 73 and the optical sheet 72 are seated and fixed to the third stepped portion 103 formed on the frame mold side 10. Thus, by forming the 3rd step part 103, the diffuser plate 73 and the optical sheet 72 can be fixed firmly. Here, since the diffusion plate 73 is seated and fixed to the third stepped part 103, the diffusion plate 73 is spaced apart from the first stepped part 101 with the second stepped part 102 interposed therebetween. Since the first stepped portion 101 which is in surface contact with both surfaces 741a and 741b of the lamp holder 74 is in a high temperature state due to heat dissipation, when the heat is conducted to the diffusion plate 73, the diffusion plate 73 is There is a possibility that bending occurs in the optical sheet 72 that is bent or positioned above it. Therefore, the diffusion plate 73 may be spaced apart from the first stepped portion 101 to minimize the influence of heat.

4 is an exploded perspective view of a flat panel display device 100 having a backlight assembly 70 according to an exemplary embodiment of the present invention, and the flat panel display device 100 in which the liquid crystal display panel 50 is coupled to the backlight assembly 70. ).                     

Although the liquid crystal display panel 50 is shown as an example of a flat panel display panel in FIG. 4, this is merely to illustrate the present invention and the present invention is not limited thereto. Accordingly, other types of light receiving flat panel display panels may be used. The flat panel display 100 is manufactured by assembling the backlight assembly 70 while covering the liquid crystal display panel 50 positioned on the backlight assembly 70 with the top chassis 60.

The liquid crystal display panel assembly 40 includes a liquid crystal display panel 50, a COF (chip on film) 43, 44, and a printed circuit board 41, 42, etc. connected thereto to supply a driving signal. It includes. The printed circuit boards 41 and 42 may be accommodated in the side surface of the top chassis 60.

The liquid crystal display panel 50 includes a TFT substrate 51 composed of a plurality of TFTs (thin film transistors), a color filter substrate 53 positioned on the TFT substrate 51, and a liquid crystal (injected therebetween). Not shown). Polarizing plates are attached to the upper portion of the color filter substrate 53 and the lower portion of the TFT substrate 51 to polarize light passing through the liquid crystal display panel 50.

The TFT substrate 51 is a transparent glass substrate on which a matrix thin film transistor is formed, a data line is connected to a source terminal, and a gate line is connected to a gate terminal. In the drain terminal, a pixel electrode made of transparent indium tin oxide (ITO) as a conductive material is formed.

When electrical signals are input from the printed circuit boards 41 and 42 to the gate lines and the data lines of the liquid crystal display panel 50 described above, electrical signals are input to the gate terminal and the source terminal of the TFT, and these electrical signals are input. According to the input of the TFT, the TFT is turned on or turned off so that an electrical signal necessary for pixel formation is output to the drain terminal.

On the other hand, the color filter substrate 53 is disposed thereon opposite the TFT substrate 51. The color filter substrate 53 is a substrate in which RGB pixels, which are color pixels in which a predetermined color is expressed while light passes, are formed by a thin film process, and a common electrode made of ITO is coated on the entire surface thereof. When power is applied to the gate terminal and the source terminal of the TFT and the thin film transistor is turned on, an electric field is formed between the pixel electrode and the common electrode of the color filter substrate. By this electric field, the arrangement angle of the liquid crystal injected between the TFT substrate 51 and the color filter substrate 53 is changed, and the light transmittance is changed according to the changed arrangement angle to obtain a desired pixel.

The printed circuit boards 41 and 42 for receiving image signals from the outside of the liquid crystal display panel 50 and applying driving signals to the gate lines and the data lines, respectively, are respectively attached to the COFs 43 attached to the liquid crystal display panel 50. , 44). In order to drive the flat panel display device 100, the gate side printed circuit board 41 generates a gate driving signal, and the data side printed circuit board 42 generates a data driving signal. A gate drive signal, a data drive signal, and a plurality of drive signals for applying these signals at an appropriate time are generated to generate the gate drive signal and the data drive signal, respectively, on each COF 43 in which the integrated circuit chips 431 and 441 are mounted. , And applied to the gate line and the data line of the liquid crystal display panel 50 through, 44. A control board (not shown) is installed on the back of the backlight assembly 70. The control board is connected to the data side printed circuit board 42 to convert an analog data signal into a digital data signal and then supplies the same to the liquid crystal display panel 50.

The top chassis 60 is disposed on the liquid crystal display panel assembly 40 to prevent the liquid crystal display panel assembly 40 from being separated from the backlight assembly 70 while bending the COFs 43 and 44 to the side of the backlight assembly 70. It is provided. Although not shown in FIG. 1, the front case and the rear case are positioned at the top of the top chassis 60 and the bottom of the bottom chassis 75, respectively, to form the flat panel display device 100 by combining them.

In the case of the flat panel display device 100 assembled as described above, the heat dissipation function of the backlight assembly 70 is improved, and thus there is no possibility that the liquid crystal in the liquid crystal display panel 50 positioned thereon is deteriorated. Accordingly, malfunction of the liquid crystal display panel 50 may be prevented and a clear image may be realized.

Since the backlight assembly according to the present invention includes a frame mold side having a plurality of stepped portions extending in an arrangement direction of a lamp, the strength of the frame mold side can be improved.

In addition, since one of the plurality of stepped portions is in surface contact with both surfaces forming one corner of the lamp holder, heat generated from the lamp electrode portion can be efficiently discharged.

The diffusion plate may be seated and fixed to another step to firmly support the diffusion plate.

Since the diffuser plate is spaced apart from the stepped portions in surface contact with both sides of the lamp holder, it is possible to prevent deterioration of the diffuser plate due to heat emitted from the lamp holder.

Since the frame mold side is made of a thermally conductive metal material, heat emitted from the lamp electrode portion through the lamp holder can be efficiently discharged.                     

Here, since the metal is sus or aluminum, efficient heat dissipation is possible.

The frame mold side can be produced simply by press molding a plate made of a thermally conductive metal material.

Since the frame mold side penetrates through the arrangement direction of the lamp, a free space can be secured so that the frame mold side can be easily inserted and fixed on the bottom chassis.

Since the frame mold side is in surface contact with the bottom chassis, heat transferred through the frame mold side can be transferred to the bottom chassis for easy release.

Since the flat panel display device according to the present invention includes the above-described backlight assembly, the heat dissipation efficiency is improved to prevent high temperature deterioration of internal components.

Since the liquid crystal display panel can be used as the flat panel display panel, there is an advantage that can prevent the degradation of the liquid crystal.

Although the present invention has been described above, it will be readily understood by those skilled in the art that various modifications and variations are possible without departing from the spirit and scope of the claims set out below.

Claims (11)

Lamp emitting light, A lamp holder installed at an end of the lamp to fix and support the lamp, A frame mold side covering and fixing the lamp holder and having a plurality of stepped portions extending in an arrangement direction of the lamp, and A bottom chassis for receiving the lamp, the lamp holder and the frame mold side Backlight assembly comprising a (backlight assembly). In claim 1, And one step of the plurality of stepped portions is in surface contact with both surfaces forming one corner of the lamp holder. In claim 2, And a diffuser plate configured to diffuse light emitted from the lamp, wherein the diffuser plate is seated and fixed to another stepped portion of the plurality of stepped portions. In claim 3, The diffuser plate is spaced apart from the one step portion which is in surface contact with both sides of the lamp holder. In claim 1, The frame mold side is a backlight assembly made of a thermally conductive metal material. In claim 5, And the metal is sus (stainless use steel, stainless steel) or aluminum. In claim 5, The frame mold side is a backlight assembly press-molded a plate made of the thermally conductive metal material. In claim 1, And a frame mold side penetrating in an array direction of the lamp. In claim 1, And the frame mold side is in surface contact with the bottom chassis. A flat panel display panel displaying an image, and The backlight assembly of claim 1, wherein the backlight assembly supplies light to the flat panel display panel. Flat display device comprising a. In claim 10, And the flat panel display panel is a liquid crystal display panel.

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