KR20060084018A - A backlight assembly provided with an improved lamp holder and a flat display device provided with the same - Google Patents

Abstract

The present invention relates to a backlight assembly having an improved lamp holder and a flat panel display device having the same. The backlight assembly according to the present invention includes a lamp for supplying light, a lamp holder installed at an end of the lamp to fix and support the lamp, and a bottom chassis for storing the lamp and the lamp holder. Here, when the lamp holder is fitted into the opening formed in the bottom chassis, a groove is formed in the lamp holder to form a space between the lamp holder and the bottom chassis.

Lamp Holder, Bottom Chassis, Space, Opening, Groove

Description

Back light assembly with improved lamp holder and flat panel display with same {A BACKLIGHT ASSEMBLY PROVIDED WITH AN IMPROVED LAMP HOLDER 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.

5A to 5D are diagrams sequentially illustrating a state in which the lamp holder is fixed to the bottom chassis.

The present invention relates to a backlight assembly having an improved lamp holder and a flat panel display device having the same, and more particularly, to a backlight assembly having a lamp holder having an improved structure so as to secure a fastening state, 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 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 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 fix and support the both ends of the lamp with a lamp holder (lamp holder). The lamp is fixed on the bottom chassis by inserting and fixing the lamp holder to the opening of the bottom chassis. Accordingly, the lamp can be firmly supported while preventing the lamp from flowing.

Therefore, whether the lamp can be firmly supported is indirectly influenced by how firmly the lamp holder is fixed to the bottom chassis. In general, in order to firmly support the lamp holder to the bottom chassis, a locking portion is formed in the lower part of the lamp holder and inserted and fixed to the bottom chassis. However, since the lamp holder is made of a relatively hard silicon material, and the bottom chassis is also relatively hard as a sus (stainless use steel, stainless steel) material, there is a problem that the fastening between the two is not easy. That is, even when the lamp holder is pressed to the bottom chassis, the lamp holder itself lacks the elasticity, so the amount of displacement is small, so that assembly is not performed properly. Accordingly, since the fastening structure is not strong, there is a high possibility that the lamp fixed to the lamp holder may be damaged by flowing by an external impact during transportation or transportation of the liquid crystal display device.

The present invention is to solve the above-mentioned problems, to provide a backlight assembly in which the lamp is firmly fixed by tightening the clamping force between the lamp holder and the bottom chassis.

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 is a lamp for supplying light, a lamp holder is installed at the end of the lamp to securely support the lamp, and a bottom chassis for receiving the lamp and the lamp holder ( bottom chassis). Here, when the lamp holder is fitted into the opening formed in the bottom chassis, a groove is formed in the lamp holder to form a space between the lamp holder and the bottom chassis.

Here, the lamp holder includes a lamp fixing part for fixing and holding the lamp, a through part connected to the lower part and penetrating through the opening, and a locking part connected to the bottom chassis and fixed to the bottom chassis. The groove may be formed under the lamp fixing part.

Here, the groove may be formed surrounding the connection portion of the lamp fixing portion and the penetrating portion.

In the surface where the penetrating portion and the locking portion contact each other, the end face of the locking portion preferably projects outward from the cross section of the penetrating portion.

The lamp holder may be fitted into openings formed in the bottom and sides of 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 5. 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 74, the lamp 76, the lamp holder 78 and the like, and diffuses the light emitted from the lamp 76 to uniform Afterwards, it is emitted in the Z-axis direction. The bottom chassis 75 located at the bottom of the backlight assembly 70 houses internal parts including the lamp 76 and the lamp holder 78, and a mold frame 71 located at the top thereof includes a bottom chassis 75. (bottom chassis) 75 is fixedly coupled.

A plurality of lamps 76 for supplying light are arranged to be fixedly spaced apart from the bottom chassis 75 by a predetermined distance, and the reflecting 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 an external electrode flourescent lamp (EEFL). A lamp holder 78 is provided at the end of the lamp 76 to fix and support the lamp 76. The lamp holder 78 is fastened and fixed to the opening 751 (shown in FIG. 5) formed in the bottom chassis 75 to firmly support the lamp 76 even during transportation or transportation of the backlight assembly 70. In some cases, a frame mold side placed in the Y-axis direction may be provided to cover and fix the plurality of lamp holders 78 at one time.

Light emitted from the plurality of lamps 76 is evenly spread through the diffusion plate 74. This makes it possible to distribute the light more uniformly. Then, the brightness of the light is improved and supplied to the upper part through the optical sheet 72 positioned on the diffusion plate 74. Accordingly, it is possible to supply light with uniformity and improved brightness. In addition, since the structure of the backlight assembly 70 is robust, there is a strong advantage against 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.

The enlarged source of FIG. 1 shows a lamp holder 78 fixedly supporting a lamp 76 and having a lamp wire 761 connected to the lamp 76 through its bottom. In FIG. 1, for convenience of explanation, the lamp holder 78 coupled to the bottom chassis 75 of FIG. 1 is rotated 90 ° in a counterclockwise direction, and thus the lower shape of the lamp holder 78 from which the lamp wire 761 is drawn out. Is shown in detail.

The lamp holder 78 shown in the enlarged circle of FIG. 1 includes a lamp fixing part 781, a through part 783, a locking part 785, and the like. The lamp fixing part 781 fixes and supports the lamp 76 through a lamp fixing opening 7811 formed at a side thereof. The penetrating portion 783 penetrates through the opening 751 (shown in FIG. 5) of the bottom chassis 75 and is connected to the lower portion of the lamp fixing portion 781. The engaging portion 785 is connected to the through portion 783 and is fixed to the bottom chassis 75.

Since the groove 7813 is formed in the lower portion of the lamp fixing part 781, the bottom chassis 75 when the lamp holder 78 is fastened and fixed to the opening 751 (shown in FIG. 3) formed in the bottom chassis 75. And a space can be formed between the lamp holder 78. As such, since a space is formed between the bottom chassis 75 and the lamp holder 78, the bottom chassis 75 and the lamp holder 78 may be easily fastened even though the bottom chassis 75 and the lamp holder 78 have a low elasticity and a hard material. The method of forming such a space is not limited to only deforming the lower part of the lamp fixing part 781, and may be formed through other methods. This will be described in more detail later with reference to FIG. 5.

The groove 7813 is formed in the lower portion of the lamp fixing portion 781 while surrounding the lamp fixing portion 781 of the lamp holder 78 and the connecting portion 782 of the through portion 783. That is, the through portion 783 is formed in the groove 7813. Accordingly, a space may be formed around the upper portion of the penetrating portion 783 of the lamp holder 78 to facilitate fastening with 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.

In the backlight assembly 70 shown in FIG. 2, the lamp holder 78 has an opening formed in the side of the bottom chassis 75 as well as an opening 751 (shown in FIG. 5) formed in the bottom surface of the bottom chassis 75. Since it is also fastened and fixed through the 751 (shown in FIG. 5), the bottom chassis 75 is firmly supported. Accordingly, the lamp 76 is not damaged even when an external shock is applied during the transport or the transport of the backlight assembly 70.

3 is a cross-sectional view taken along line AA of FIG. 2 and illustrates a cross-sectional structure of the backlight assembly 70 at a portion where the lamp holder 78 is installed.

As shown in FIG. 3, since a groove is formed in the lower portion of the lamp fixing part 781 of the lamp holder 78, when the lamp holder 78 is coupled on the bottom chassis 75, a space therebetween is provided. (A) is formed. Accordingly, the lamp holder 78 may be completely assembled to the bottom chassis 75 to be integrated.

On the surface (dotted line) where the penetrating portion 783 and the locking portion 785 of the lamp holder 78 contact each other, the end face 785s of the locking portion 785 is outward from the end surface 783s of the penetrating portion 783. It protrudes. For example, in FIG. 3, the cross section 785s of the locking portion 785 protrudes more than the cross section 783s of the penetrating portion 783 in the X-axis direction.

In particular, the cross section 785s of the locking portion 785 protrudes outward from the cross section 783s of the penetrating portion 783 over the entire direction. That is, in the cross-sectional structure of the lamp holder 78 shown in FIG. 3, the cross-section 785s of the locking portion 785 protrudes outward more than the cross-section 783s of the penetrating portion 783 along the X-axis direction. However, the present invention is not limited thereto, and is formed along the entire periphery of the through portion 783 in all directions. This can also be confirmed through the three-dimensional structure of the penetrating portion 783 and the locking portion 785 shown in the enlarged circle of FIG. In this way, since the engaging portion 785 protrudes in all directions and is coupled to the bottom chassis 78, the fastening is made more firm.

4 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 shows a state 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 transmits a gate driving signal, and the data side printed circuit board 42 transmits a data driving signal. The printed circuit boards 41 and 42 generate a plurality of driving signals for applying the gate driving signal and the data driving signals at an appropriate time, and the integrated circuit chips 431 and 441 are mounted with the gate driving signals and the data driving signals. Each of the COFs 43 and 44 is applied to the gate line and the data line of the liquid crystal display panel 50. 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 for preventing the liquid crystal display panel assembly 40 from escaping from the backlight assembly 70 while bending the COFs 43 and 44 to the side of the backlight assembly 70 on the liquid crystal display panel assembly 40. 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. Hereinafter, a process of fastening and fixing the lamp holder 78 to the opening 751 formed in the bottom chassis 75 will be described in more detail with reference to FIG. 5.

5A to 5D are diagrams sequentially showing a state in which the lamp holder 78 is fixed to the bottom chassis 75. Hereinafter, the state which fixes the lamp holder 78 to the bottom chassis 75 in the order of FIG. 5 (A)-(D) is demonstrated in detail.

First, as shown in FIG. 5A, the rear surface of the lamp fixing part 781 of the lamp holder 78 is inserted into the opening 751 formed in the side surface of the bottom chassis 75, and the lamp holder 78 The lamp holder 78 is moved in the direction indicated by the arrow in order to insert the penetrating portion 783 and the locking portion 785 into the opening 751 side formed on the bottom surface of the bottom chassis 75.

Accordingly, as shown in FIG. 5B, the engaging portion 785 of the lamp holder 78 is inserted into the opening 751 side formed in the bottom surface of the bottom chassis 75, and the lamp holder 78 The rear surface of the lamp fixing part 781 is inserted into the opening 751 formed on the side of the bottom chassis 75. Since the lamp holder 78 is inserted into both of the openings 751 formed in the lower and side portions of the bottom chassis 75, the lamp holder 78 can be firmly fixed.

 The through portion 783 is bottom surface of the bottom chassis 75 while the locking portion 785 protrudes outward from the bottom side of the bottom chassis 75 by applying more force in the direction of the arrow to the inserted lamp holder 78. It is to be inserted into the opening 751 formed in the.

Through such a process, as shown in FIG. 5C, the lamp holder 78 is fastened and fixed to the bottom chassis 75. A space A is formed by fastening the lamp holder 78 and the bottom chassis 75. The space A thus formed is necessary when a part of the locking portion 785 is caught as shown in FIG. 5C without exiting the opening formed in the bottom surface of the bottom chassis 75. That is, in this case, the lamp holder 78 may not be completely fastened to the bottom chassis 75, and the lamp holder 78 may be completely fastened to the bottom chassis 75 using the space A. Even if the bottom chassis 75 is slightly pushed in the direction of the arrow shown in (C) of FIG. ) Will be elastically positioned.

Accordingly, as shown in FIG. 5D, the locking portion 785 of the lamp holder 78 comes out of the opening formed in the bottom surface of the bottom chassis 75 to be perfectly on the outer surface of the bottom chassis 75. It is hooked and fixed. Accordingly, the lamp holder 78 may be completely fastened to the bottom chassis 75. As described above, the firmness of the fastening fixing is achieved through the space A formed between the bottom chassis 75 and the lamp holder 78.

Since the backlight assembly according to the present invention forms a space between the lamp holder and the bottom chassis, the escape space of the bottom chassis or the lamp holder is secured, so that the bottom chassis and the lamp holder can be completely engaged.

The lamp holder includes a lamp fixing part, a penetrating part, and a locking part, and a groove is formed in the lower part of the lamp fixing part, so that the lamp fixing part may be slightly modified to form a space easily.

Since the groove is formed surrounding the connection part of the lamp fixing part and the penetrating part, a space is formed around the penetrating part to facilitate fastening of the bottom chassis to the lamp holder.                     

Since the cross section of the engaging portion protrudes outward from the cross section of the penetrating portion, the engaging portion of the lamp holder is fastened and fixed to the bottom chassis over the entire surface, so that the clamping portion is firmly connected to the lamp holder and the bottom chassis.

Since the lamp holder can be fixed to the openings formed in the lower and side portions of the bottom chassis, the lamp holder can be firmly fixed.

Since the flat panel display device according to the present invention includes the above-described backlight assembly, there is an advantage that the lamp does not break even under a strong external impact.

As a flat panel display panel, a liquid crystal display panel which is widely used may be used, and thus, there is an advantage of excellent application potential.

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 (7)

Lamp to supply light, A lamp holder installed at an end of the lamp to fix and support the lamp; A bottom chassis for receiving the lamp and the lamp holder As a backlight assembly comprising a, And fixing the lamp holder to the opening formed in the bottom chassis, wherein a groove is formed in the lamp holder to form a space between the lamp holder and the bottom chassis. In claim 1, The lamp holder, Lamp fixing part for holding and fixing the lamp, A through part connected to a lower part of the lamp fixing part and penetrating the opening; A locking part connected to the through part and fixed to the bottom chassis And a groove formed in a lower portion of the lamp fixing part. In claim 2, The groove is formed in the backlight assembly surrounding the connecting portion of the lamp fixing portion and the through. In claim 2, The cross-section of the engaging portion protruding outward from the cross-section of the through portion in a surface where the through portion and the engaging portion contact. In claim 1, The lamp holder is fixed to the opening formed in the lower and side portions of the bottom chassis assembly. A flat panel display panel displaying an image, and The backlight assembly according to any one of claims 1 to 5, which supplies light to the flat panel display panel. Flat display device comprising a. In claim 6, And the flat panel display panel is a liquid crystal display panel.

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