KR20060084559A - A backlight assembly improving a member for discharging heat and a flat display device provided with the same - Google Patents

Abstract

The present invention relates to a backlight assembly having an improved heat dissipation member and a flat panel display device having the same. To this end, the backlight assembly according to the present invention includes a light source unit including a plurality of light sources for emitting light, a bottom chassis fixedly supporting the light source unit on one surface thereof, and a heat dissipation member attached to an opposite surface of the bottom chassis. It includes. Here, both ends of the heat dissipation member are bent to the outside.

Heat dissipation member, heat sink, bend, light emitting diode

Description

Back light assembly with improved heat dissipation member and flat panel display device with same {A BACKLIGHT ASSEMBLY IMPROVING A MEMBER FOR 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 rear perspective view of the backlight assembly according to an exemplary embodiment of the present invention.

3 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 an improved heat dissipation member and a flat panel display device having the same, and more particularly, to a backlight assembly having a modified heat dissipation member for easy handling and a flat panel display device having the same.

With the recent rapid development of semiconductor technology, the demand for liquid crystal display devices having improved performance while being smaller and lighter 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 gradually and is currently used in almost all information processing devices that require 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 liquid crystal display, a plurality of lamps are disposed to display a clearer image, thereby providing light having improved brightness. These large liquid crystal display devices use a plurality of lamps to display a clear image, the heat generation problem caused by this is seriously raised. That is, liquid crystals are deteriorated due to heat emitted from a plurality of lamps, and thermal deformation occurs in peripheral components, thereby degrading durability of the liquid crystal display, and thus, many problems occur.

Accordingly, a method of dissipating heat generated from the inside to the outside by installing a heat dissipation member in a large LCD has been continuously developed. As the surface area of the heat dissipation member is increased, the heat dissipation effect is gradually improved. As the size of the large liquid crystal display increases, the size of the heat dissipation member is gradually increased. Since the heat dissipation member, which is gradually increased in size, is protruded to the outside of the large liquid crystal display and is sharply formed at an edge thereof, a safety accident occurs because the hand touches the edge of the heat dissipation member during transportation or transportation. there was.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a backlight assembly that is easy to transport or handle while dissipating heat generated from a light source efficiently.

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

A backlight assembly according to the present invention for achieving the above object is a light source unit including a plurality of light sources for emitting light, a bottom chassis for fixing and supporting the light source unit on one surface, and And a heat dissipation member attached to an opposite surface of one surface of the bottom chassis. Here, both ends of the heat dissipation member are bent to the outside.

The heat dissipation member may extend in the direction of air flow flowing along the opposite surface of the bottom chassis.

The heat dissipation member is preferably a heat sink.

The light source unit is preferably a line light source consisting of a plurality of light emitting diodes (LEDs).                     

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

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 3. 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 light source unit 76 and the reflective sheet 79, etc., the backlight assembly 70 is emitted from the light source unit 76 The light is diffused to make it uniform and then emitted in the Z-axis direction. The bottom chassis 75 located below the backlight assembly 70 accommodates the internal components of the backlight assembly 70 described above, and covers and secures the upper part of the backlight chassis 70 with a mold frame 71. The light source unit 76 including the light source 761 is fixedly supported on one surface of the bottom chassis 75, that is, the inner surface of the bottom chassis 75.

The light source unit 76 includes a plurality of light sources 761 that emit light. 1 shows a light emitting diode as the light source 761. The light source unit 76 forms a line light source consisting of a plurality of light emitting diodes. Although a light emitting diode is shown as a light source 761 in FIG. 1, this is merely to illustrate the present invention, but the present invention is not limited thereto. Therefore, a lamp may be used as a light source in addition to the light emitting diode.

The light source unit 76 shown in FIG. 1 includes a light source 761, a substrate 763, a support plate 765, and the like. The light source 761 is a light emitting diode, and light sources of red (R), green (G), and blue (B) are sequentially arranged to emit white light in which they are uniformly mixed in the Z-axis direction. The light source 761 is mounted on the substrate 763 to receive a driving voltage, and is supported and grounded by a support plate 765 disposed below. The light source unit 76 of this structure is connected to an inverter 74 (shown in FIG. 2), which is a printed circuit board (PCB) for power supply, and receives a driving voltage therefrom.

Most of the light emitted from the light source 761 is emitted toward the diffuser plate 73, and part of the light is reflected toward the diffuser plate 73 by the reflective sheet 79 provided on the bottom surface of the bottom chassis 75. Light emitted to the diffusion plate 73 side is diffused evenly in the diffusion plate 73. This makes it possible to distribute the light more uniformly. The brightness of the light is improved through the optical sheet 72 positioned on the diffusion plate 73 and supplied in the Z-axis direction. Accordingly, it is possible to supply uniform light with improved brightness.

The backlight assembly 70 shown in FIG. 1 is used by being attached to a wall or the like, and shows the state of being attached to the wall. Therefore, when light is emitted from the light source 761, the temperature of its surroundings rises due to heat generation, so that the heated air rises in the Y-axis direction, which is the arrow direction. That is, since the heated air rises, air flow occurs in the direction of the arrow. Air flows along the outer surface, which is opposite the inner surface, which is one surface of the bottom chassis 75.

The heat dissipation member 10 shown in FIG. 1 is attached to the opposite surface of the bottom chassis 75 and extends along the Y-axis direction. Since the heat radiating member 10 extends along the Y-axis direction which is an air flow direction, heat radiating is performed efficiently. Hereinafter, the heat dissipation structure of the backlight assembly 70 will be described in more detail with reference to FIG. 2.

FIG. 2 is a rear perspective view of the backlight assembly 70 according to an embodiment of the present invention. After combining all the internal components of the backlight assembly 70 illustrated in FIG. 1, the lens is rotated 90 ° to the left with respect to the Y axis. Indicates the state.

As shown in FIG. 2, the heat dissipation member 10 having both ends 101 bent outward is attached to the surface of the bottom chassis 75. Since both ends 101 are bent smoothly outward in the direction in which the heat dissipation member 10 extends, there is almost no risk of getting a hand in contact with the heat dissipation member 10 while transporting or transporting the backlight assembly 70. none. Accordingly, the backlight assembly 70 can be easily transported or transported.

2 shows that the heat dissipation member 10 is attached to both sides of the bottom chassis 75, this is merely to illustrate the present invention and the present invention is not limited thereto. Therefore, the heat dissipation member 10 may be attached in other forms.

As shown in FIG. 2, the heat sink having the maximum surface area may be used as the heat dissipation member 10. Accordingly, the heat conduction effect can be maximized by allowing heat conducted from the bottom chassis 75 to be discharged through the surface of the heat sink.                     

3 is an exploded perspective view of a flat panel display device 100 having a backlight assembly 70 according to an 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. ).

3 illustrates the liquid crystal display panel 50 as an example of a flat panel display panel, 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 may include a liquid crystal display panel 50, driver integrated circuit packages 43 and 44 connected to the liquid crystal display panel 50, and a printed circuit board 41 and 42. Include. The driving IC packages 43 and 44 may use a chip on film (COF) or a tape carrier package (TCP). 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 the image signals from the outside of the liquid crystal display panel 50 and applying the driving signals to the gate lines and the data lines, respectively, are mounted on the respective driving IC packages attached to the liquid crystal display panel 50. (43, 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. Each driving IC package having the integrated circuit chips 431 and 441 mounted thereon by generating a gate driving signal, a data driving signal, and a plurality of driving signals for applying these signals at an appropriate time. The gate lines and the data lines of the liquid crystal display panel 50 are applied to the gate lines 43 and 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 for preventing the liquid crystal display panel assembly 40 from being separated from the backlight assembly 70 while bending the driving IC packages 43 and 44 to the side of the backlight assembly 70 may be disposed on the liquid crystal display panel assembly 40. 60). Although not shown in FIG. 1, the front case and the rear case are positioned at the front portion of the top chassis 60 and the rear portion of the bottom chassis 75, respectively, to form a flat panel display device 100 by combining them.

In the case of the flat panel display device 100 assembled in this way, the heat dissipation function of the backlight assembly 70 is improved due to the heat dissipation member 10, 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.

In the backlight assembly according to the present invention, since both ends of the heat dissipation member are formed to be bent outward, there is no risk of injuring hands when transporting or transporting the backlight assembly.

The heat dissipation member may extend in the air flow direction to maximize the heat dissipation efficiency.

Since the heat dissipation member is a heat sink, the surface area required for heat dissipation can be maximized, so the heat dissipation member is excellent.

Since the light source unit is formed of a plurality of light emitting diodes, there is an advantage in that power consumption is low and impact is strong.

Since the flat panel display device according to the present invention includes the above-described backlight assembly, there is no risk of injuries during handling and heat dissipation during use, and thus there is no internal failure due to deterioration.

Since the flat panel display panel is a liquid crystal display panel, there is an advantage that the application possibility is excellent.

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 (6)

A light source unit including a plurality of light sources for emitting light, A bottom chassis fixedly supporting the light source unit on one surface thereof, and A heat dissipation member attached to a surface opposite to one surface of the bottom chassis Including, A backlight assembly having both ends of the heat dissipation member bent outwardly. In claim 1, And the heat dissipation member extends in an airflow direction flowing along an opposite surface of the bottom chassis. In claim 1 And the heat dissipation member is a heat sink. In claim 1, The light source unit is a backlight assembly comprising a plurality of light emitting diodes (LED). A flat panel display panel displaying an image, and The backlight assembly according to any one of claims 1 to 4, which supplies light to the flat panel display panel. Flat display device comprising a. In claim 5, And the flat panel display panel is a liquid crystal display panel.

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