KR20060015868A - Backlight assembly of liquid crystal display and liquid crystal display using the same - Google Patents

Abstract

In the backlight assembly of the liquid crystal display device for effectively dissipating heat generated from the electrode of the lamp to the outside, an opening for partially exposing the lamp support structure is formed in a mold frame mounted to cover the lamp support structure supporting the electrode portion of the lamp. The backlight assembly is disclosed to efficiently discharge heat generated in the lamp electrode portion to the outside. By dissipating the heat generated by the lamp to the outside of the backlight assembly, it is possible to improve the brightness deterioration and brightness unevenness of the lamp.

LCD, backlight, mold frame, heat dissipation

Description

BACKLIGHT ASSEMBLY OF LIQUID CRYSTAL DISPLAY AND LIQUID CRYSTAL DISPLAY USING THE SAME}

1 is a perspective view illustrating a cross section of a backlight assembly according to an exemplary embodiment of the present invention.

FIG. 2 is a perspective view illustrating a mold frame and a lamp holder mounted on a bottom chassis in the backlight assembly illustrated in FIG. 1.

3 is a perspective view illustrating a mold frame according to an exemplary embodiment of the backlight assembly illustrated in FIG. 1.

4 is a cross-sectional view illustrating a fastening state between the mold frame and the bottom chassis illustrated in FIG. 3.

FIG. 5 is a perspective view illustrating the fastening state of the mold frame and the bottom chassis shown in FIG. 3 from the bottom surface of the bottom chassis.

6 is a perspective view illustrating a mold frame according to another embodiment of the backlight assembly shown in FIG. 1.

FIG. 7 is a cross-sectional view illustrating a fastening state between the mold frame and the bottom chassis illustrated in FIG. 6.

FIG. 8 is a perspective view illustrating a fastening state between the mold frame and the bottom chassis shown in FIG. 6.

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

100: backlight assembly 110, 710: bottom chassis

112: bottom chassis sidewalls 114, 714: fastening groove

120: reflective sheet 130, 730: lamp

140, 740: lamp holder 150, 650: mold frame

152: lamp through hole 154, 654 opening

160: Panel guide 170: Optical sheet

180: liquid crystal display panel 190: top chassis

310: upper and lower protrusions 312: protrusions

314: hook 610: side fastening structure

612: screw fastening groove 614: sheet guide structure

The present invention relates to a backlight assembly of a liquid crystal display and a liquid crystal display using the same, and more particularly, to a backlight assembly having a lamp and a liquid crystal display using the same.

Liquid crystal display (liquid crystal) is a flat panel display that displays information by controlling the amount of light transmitted through the movement of the liquid crystal (liquid crystal) controlled by an electrical signal, the liquid crystal panel having the liquid crystal itself Liquid crystal displays are light-receiving elements that require a backlight assembly to provide light because they cannot emit light.

Such liquid crystal displays are widely used due to the advantages of light weight, thinness, and low energy consumption. In particular, the liquid crystal display has been increasingly used as a large display such as a TV.

When a liquid crystal display is used for a small display, a light source may be disposed at the end of the backlight assembly and guided light may be used to secure sufficient luminance. As this widens, sufficient brightness cannot be ensured only by the light source disposed at the end, so a direct method of arranging a plurality of light sources under the display panel is used.

As the size of the liquid crystal display increases, the length of the lamp used as the light source becomes longer, and the temperature difference between both ends increases, and in this case, mercury is caused from the high temperature portion to the low temperature portion, and thus the brightness of the high temperature portion and the low temperature portion decreases. There is a problem that luminance unevenness occurs. Moreover, in order to simplify the wire wiring as the size of the liquid crystal display increases, a bent lamp is often used. The bent lamp has a temperature difference across the lamp because both electrodes are a mode high temperature electrode and both electrodes are driven to one side. The problem of luminance unevenness due to the problem is further exacerbated.

In general, the brightness of the lamp used in the backlight assembly increases as the temperature increases to a predetermined temperature, but when the temperature exceeds the predetermined temperature, the brightness decreases as the temperature increases, but the temperature inside the backlight assembly is higher than the predetermined temperature value. As the temperature increases, the luminance of the light source decreases as the temperature inside the backlight assembly increases. Accordingly, since a plurality of light sources are used in the direct backlight method, there is a problem in that the temperature inside the backlight assembly is further increased and the brightness of the lamp is lowered.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a backlight assembly of a liquid crystal display device which is particularly easy to discharge heat of a lamp electrode portion in which high heat is generated.

Another object of the present invention is to provide a liquid crystal display device employing the same.

The backlight assembly of the present invention for achieving the above object includes a receiving structure, at least one light source, a light source support structure and a mold frame. The receiving structure has a bottom surface and one or more sidewalls. The light source is provided in the receiving structure. The light source support structure is mounted adjacent to a first sidewall of one or more sidewalls of the receiving structure and coupled to an end of the light source to fix each light source. The mold frame has openings for exposing at least a portion of the respective light source support structures on one surface thereof, and is disposed on the light source support structures along the first sidewall of the receiving structure.

In addition, a liquid crystal display according to another embodiment of the present invention includes a liquid crystal display panel, an optical sheet, and a backlight assembly. The optical sheets are disposed under the liquid crystal display panel to improve light characteristics. The backlight assembly supplies light supplied to the liquid crystal display panel. The backlight assembly also includes a receiving structure, one or more light sources, a light source supporting structure and a mold frame. The receiving structure has a bottom surface and one or more sidewalls. The light source is provided in the receiving structure. The light source support structure is mounted adjacent to a first sidewall of one or more sidewalls of the receiving structure and coupled to an end of the light source to fix each light source. The mold frame has openings for exposing at least a portion of the respective light source support structures on one surface thereof, and is disposed on the light source support structures along the first sidewall of the receiving structure.

Therefore, a portion of the lamp holder for supporting the lamp electrode portion is exposed through the opening formed in the mold frame so that heat generated in the electrode portion is easily discharged to the outside of the backlight assembly without being trapped inside the mold frame. In particular, by contacting the lamp holder exposed through the opening to the bottom of a high thermal conductivity, the heat dissipation effect can be further enhanced.

By facilitating heat dissipation of the lamp electrode portion in this way, the temperature uniformity between the high temperature portion and the low temperature portion of the light source can be reduced, thereby improving the luminance uniformity of the light source.

Hereinafter, a backlight assembly of a liquid crystal display according to the present invention will be described with reference to the accompanying drawings.

1 is a cross-sectional view of a backlight assembly according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the backlight assembly 100 of the liquid crystal display includes a bottom chassis 110, a reflective sheet 120, a lamp 130, a lamp holder 140, a mold frame 150, and a panel guide. 160, an optical sheet 170, a liquid crystal display panel 180, and a top chassis 190.

The lamp holder 140 is connected to the electrode part of the lamp 130 to support the lamp 130, and a protrusion for fixing the lamp holder 140 is formed on the bottom surface of the lamp holder 140 by the bottom chassis 110. It is fitted in the groove formed in the) is mounted on the bottom chassis 110. The lamp 130 may be a straight lamp, or may be a bent lamp such as a U-shaped lamp to simplify the wire structure. The lamp holder 140 has a top surface and a front surface in which the lamp 130 is connected and extended by the mold frame 150, and a rear surface of the lamp holder 140 adjacent to the bottom chassis 110 is bottom chassis 110. ) Is contacted with the sidewall 112. The mold frame 150 has an opening at a position corresponding to the rear surface of the lamp holder 140, so that the rear surface of the lamp holder 140 is exposed when the mold frame 150 is mounted on the bottom chassis 110. do. The optical sheet 170 is placed on the mold frame 150, and the panel guide 160 is mounted thereon. The liquid crystal display panel 180 is disposed on the panel guide 160, and the top chassis 190 is mounted thereon. The mold frame 150 is disposed between the lamp holder 140 and the liquid crystal display panel 180 to prevent heat generated from the lamp electrode portion from flowing into the liquid crystal display panel 180, and at the same time, the lamp holder ( An opening for exposing a portion of 140 facilitates the release of heat generated in the electrode portion of lamp 130. In particular, the lamp holder 140 supporting the electrode of the lamp 130 contacts the bottom chassis 110 having high thermal conductivity, thereby effectively dissipating heat generated from the electrode to the outside of the backlight assembly.

 FIG. 2 is a perspective view illustrating a mold frame and a lamp holder according to the present invention mounted on a bottom chassis in the backlight assembly illustrated in FIG. 1.

Referring to FIG. 2, the sidewalls of the bottom chassis in contact with the lamp holder are not shown in order to facilitate understanding of the coupling between the mold frame 150 and the lamp holder 140. One side of the lamp holder 140 is exposed through the opening 154 formed in the mold frame 150, and the opening 154 is formed to match the shape of the lamp holder 140 to be exposed to the lamp holder 140. There is no space between the opening 154 of the mold frame 150 to prevent foreign matter from entering into the backlight assembly.

 3 is a perspective view illustrating a mold frame according to an exemplary embodiment of the present invention of the backlight assembly illustrated in FIG. 1.

Referring to FIG. 3, the mold frame 150 includes a lamp through hole 152 for passing a lamp, an opening 154 for exposing a lamp holder, and a vertical fastening structure for fixing the mold frame 150 to a bottom chassis. 310 is provided. The upper and lower fastening structure 310 protrudes from the upper surface of the mold frame 150 and has an end shape having a hook shape. The upper and lower fastening structures 310 are inserted into the bottom fastening groove 114 formed on the bottom surface of the bottom chassis, and the mold frame 150 is disposed on the bottom chassis. To be fixed.

4 is a cross-sectional view showing a fastening state of a mold frame and a bottom chassis according to an embodiment of the present invention shown in FIG. 3, and FIG. 5 is a mold frame according to an embodiment of the present invention shown in FIG. It is a perspective view showing the fastening state of the bottom chassis from the bottom surface of the bottom chassis.

4 and 5, the pair of protrusions 312 extend parallel to each other from a top surface of the mold frame at a distance from each other, and hooks 314 are formed at the ends of the protrusions 312 to fasten the upper and lower ends. When the structure 310 is pushed into the bottom fastening groove 114 of the bottom chassis 110, the edge of the bottom fastening groove 114 exerts a force on the inclined surface of the hook 314 so that the distance between the protrusions 312 is close. After the up and down fastening structure 310 is inserted into the bottom fastening groove 114 and inserted, both protrusions form a gap again, so that the mold frame 150 is fixed to the bottom chassis 110.

6 is a perspective view illustrating a mold frame according to another embodiment of the present invention of the backlight assembly shown in FIG. 1. 7 is a cross-sectional view illustrating a fastening state between a mold frame and a bottom chassis according to another embodiment of the present invention shown in FIG. 6, and FIG. 8 is a mold frame according to another embodiment of the present invention shown in FIG. 6. And a perspective view illustrating a fastening state of the bottom chassis.

6 to 8, instead of having the vertical fastening structure 310 as shown in FIG. 3, the mold frame 650 has three side fastening structures 610 on three sides that are respectively planed to be adjacent to the side wall of the bottom chassis. Has A side wall fastening groove 716 corresponding to the side fastening structure 610 of the mold frame 650 is formed on the side wall of the bottom chassis 710 illustrated in FIG. 7, and the side fastening structure 610 is formed on the side wall fastening groove ( The mold frame 650 is fixed to the bottom chassis 710 by being fitted to the 716. Reference numeral 654 denotes an opening for exposing the lamp holder 740, reference numeral 612 denotes a screw fastening groove to which screws mounted from the outside of the bottom chassis 110 are fastened when the backlight assembly is assembled, and reference numeral 614 denotes an optical sheet. An optical sheet guide structure for holding the position of the optical sheet 170 by being fitted into the fixing groove formed in the 170 is indicated. When the fastening structure is formed on the side of the mold frame 650 as described above, it is not necessary to form the fastening groove on the bottom surface of the bottom chassis 710, thereby reducing light leakage through the fastening groove on the bottom surface and fastening the bottom surface. There is an advantage that can prevent the introduction of foreign matter through the groove.

As described above, according to the backlight assembly according to the present invention, a part of the lamp holder for supporting the lamp electrode part is exposed through an opening formed in the mold frame so that heat generated in the electrode part is easily trapped inside the mold frame without being trapped inside the mold frame. Is released. In particular, by contacting the lamp holder exposed through the opening to the bottom of a high thermal conductivity, the heat dissipation effect can be further enhanced.

By facilitating heat dissipation of the lamp electrode portion in this way, the temperature uniformity between the high temperature portion and the low temperature portion of the light source can be reduced, thereby improving the luminance uniformity of the light source.

Claims (26)

An enclosure having a bottom surface and at least one side wall, At least one light source provided in the receiving structure, A light source support structure mounted adjacent to a first sidewall of the one or more sidewalls of the receiving structure and coupled to an end of the light source to fix each light source; and An opening for exposing at least a portion of each light source support structure on one surface, the backlight assembly including a mold frame disposed on the light source support structure along a first sidewall of the receiving structure. The method of claim 1, And one surface of which the opening of the mold frame is formed is adjacent to the first sidewall of the receiving structure. The method according to claim 1 or 2, And a portion of the light source support structure exposed through the opening of the mold frame to contact the first sidewall of the receiving structure. The method of claim 3, wherein The opening of the mold frame corresponds to the shape of the outer surface of the light source support structure, the backlight assembly, characterized in that positioned so that the opening of the mold frame and the light source support structure in close contact. The method of claim 3, wherein The mold frame is a backlight assembly, characterized in that the through-hole through which the light source can pass is formed on the other surface facing the one surface formed with the opening. The method of claim 3, wherein The mold frame further includes a fastening structure that protrudes vertically from the top surface facing the bottom surface of the housing structure toward the bottom surface of the housing structure. Fastening grooves are formed on the bottom surface of the receiving structure corresponding to the fastening structure. And a fastening structure of the mold frame is fastened to a fastening groove of the receiving structure to fix the mold frame to the receiving structure. The method of claim 3, wherein The mold frame further includes a fastening structure protruding from a side surface integrally formed on another plane adjacent to one surface of the mold frame in which the opening is formed, A fastening groove corresponding to the fastening structure of the mold frame is formed on a second side wall facing the side surface on which the fastening structure of the mold frame is formed and adjacent to the first side wall of the receiving structure, and And a fastening structure of the mold frame is fastened to a fastening groove of the receiving structure to fix the mold frame to the receiving structure. The method of claim 7, wherein The mold frame further includes a fastening structure protruding from one surface of the mold frame in which the opening is formed toward the first sidewall of the receiving structure. A fastening groove corresponding to the fastening structure of the mold frame is formed on the first sidewall of the receiving structure, and And a fastening structure of the mold frame is fastened to a fastening groove of the receiving structure to fix the mold frame to the receiving structure. The method according to claim 1 or 2, The mold frame further includes a fastening structure protruding from a side surface integrally formed on another plane adjacent to one surface of the mold frame in which the opening is formed. A fastening groove corresponding to the fastening structure of the mold frame is formed on a second side wall facing the side surface on which the fastening structure of the mold frame is formed and adjacent to the first side wall of the receiving structure, and And a fastening structure of the mold frame is fastened to a fastening groove of the receiving structure to fix the mold frame to the receiving structure. The method of claim 9, The mold frame further includes a fastening structure protruding from one surface of the mold frame in which the opening is formed toward the first sidewall of the receiving structure. A fastening groove corresponding to the fastening structure of the mold frame is formed on the first sidewall of the receiving structure. And a fastening structure of the mold frame is fastened to a fastening groove of the receiving structure to fix the mold frame to the receiving structure. The method of claim 9, And a portion of the light source support structure exposed through the opening of the mold frame to contact the first sidewall of the receiving structure. The method of claim 9, The opening of the mold frame is formed to completely correspond to the shape of the outer surface of the light source support structure, and when the mold frame is mounted at a predetermined position of the receiving structure, the opening of the mold frame and the light source support structure are closely attached to each other. Backlight assembly, characterized in that the. The method of claim 9, The mold frame further comprises a through-hole through which the light source can pass through the other surface facing the one surface formed with the opening. Liquid crystal display panel, An optical sheet disposed below the liquid crystal display panel to improve light characteristics, and A backlight assembly configured to supply the light to the liquid crystal display panel; The backlight assembly A receiving structure having a bottom surface and at least one side wall, At least one light source provided in the receiving structure; A light source support structure mounted adjacent to a first sidewall of the one or more sidewalls of the receiving structure and coupled to an end of the light source to fix each light source; and An opening for exposing at least a portion of each light source support structure on one surface thereof, the mold frame being mounted to cover the light source support structure along the first sidewall. The method of claim 14, And a surface on which the opening of the mold frame is formed is adjacent to the first sidewall of the accommodating structure. The method according to claim 14 or 15, And a portion of the light source support structure is exposed through the opening of the mold frame to be in contact with the first sidewall of the receiving structure. The method of claim 16, And an opening of the mold frame corresponds to a shape of an outer surface of the light source supporting structure, and the opening of the mold frame is in close contact with the light source supporting structure. The method of claim 16, The mold frame is a liquid crystal display, characterized in that through-holes through which the light source can pass are formed on the other surface opposite to one surface on which the opening is formed. The method of claim 16, The mold frame further includes a fastening structure that protrudes vertically from the top surface facing the bottom surface of the housing structure toward the bottom surface of the housing structure. The bottom surface of the receiving structure is formed with a fastening groove corresponding to the fastening structure, And a fastening structure of the mold frame is fastened to a fastening groove of the accommodating structure to fix the mold frame to the accommodating structure. The method of claim 16, The mold frame further includes a fastening structure protruding from a side surface integrally formed on another plane adjacent to one surface of the mold frame in which the opening is formed. Fastening grooves corresponding to the fastening structure of the mold frame are further formed on the second sidewall facing the side surface on which the fastening structure of the mold frame is formed and adjacent to the first side wall of the receiving structure, and And a fastening structure of the mold frame is fastened to a fastening groove of the accommodating structure to fix the mold frame to the accommodating structure. The method of claim 20, The mold frame further includes a fastening structure protruding from one surface of the mold frame in which the opening is formed toward the first sidewall of the receiving structure. A fastening groove corresponding to the fastening structure of the mold frame is formed on the first sidewall of the receiving structure, and And a fastening structure of the mold frame is fastened to a fastening groove of the accommodating structure to fix the mold frame to the accommodating structure. The method according to claim 14 or 15, The mold frame further includes a fastening structure protruding from a side surface integrally formed on another plane adjacent to one surface of the mold frame in which the opening is formed, A fastening groove corresponding to the fastening structure of the mold frame is formed on a second side wall facing the side surface on which the fastening structure of the mold frame is formed and adjacent to the first side wall of the receiving structure, and And a fastening structure of the mold frame is fastened to a fastening groove of the accommodating structure to fix the mold frame to the accommodating structure. The method of claim 22, The mold frame further includes a fastening structure protruding from one surface of the mold frame in which the opening is formed toward the first sidewall of the receiving structure. A fastening groove corresponding to the fastening structure of the mold frame is further formed on the first sidewall of the receiving structure. And a fastening structure of the mold frame is fastened to a fastening groove of the accommodating structure to fix the mold frame to the accommodating structure. The method of claim 22, And a portion of the light source support structure is exposed through the opening of the mold frame to be in contact with the first sidewall of the receiving structure. The method of claim 22, The opening of the mold frame is formed to completely correspond to the shape of the outer surface of the light source support structure, and when the mold frame is mounted at a predetermined position of the receiving structure, the opening of the mold frame and the light source support structure are closely attached to each other. Liquid crystal display device characterized in that. The method of claim 22, And the mold frame further comprises a through hole through which the light source passes on the other surface of the mold frame, the surface of which is opposite to the one surface on which the opening is formed.

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